JP2009180330A - Automobile cylindrical vibration absorbing device manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a novel automobile cylindrical vibration absorbing device manufacturing method for securing a high degree of freedom in designing spring characteristics while facilitating manufacturing and mounting work on automobile. <P>SOLUTION: The method comprises preparing an outer cylinder member 14 having a cylindrical press fitting outer peripheral face 24 and tapered inner peripheral faces 30, 32 whose diameters are gradually smaller as tending from both axial sides toward the center, and a pair of inner split bodies 36, 38 having tapered outer peripheral faces 42, 56, vulcanizing and bonding an abutting rubber elastic body 16 to the radially opposite face(s) of one of the inner split bodies 36, 38 and the outer cylinder member 14 and inserting the pair of inner split bodies 36, 38 through both axial sides of the outer cylinder member 14 until connecting and fixing them to each other to form an inner shaft member 12, and pushing the abutting rubber elastic body 16 bonded to one of the inner split bodies 36, 38 and the outer cylinder member 14 to the other to elastically connect the inner shaft member 12 to the outer cylinder member 14 via the abutting rubber elastic body 16. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  In the present invention, the inner shaft member and the outer cylindrical member spaced apart on the outer peripheral side of the inner shaft member are elastically connected by a pair of tapered cylindrical rubber elastic bodies whose diameter decreases from both axial sides toward the center. The present invention relates to a method for manufacturing a tubular vibration isolator for an automobile.

  2. Description of the Related Art Conventionally, as a type of vibration isolator such as an anti-vibration coupling body or an anti-vibration support body interposed between members of a vibration transmission system, for example, Patent Document 1 (Japanese Patent Laid-Open No. 07-158676) discloses. Such a cylindrical vibration isolator for automobiles is known. In such a tubular vibration isolator for automobiles, an inner metal fitting and an outer cylinder metal fitting that are spaced apart from each other in the radial direction are elastically connected to each other by a cylindrical rubber elastic body interposed therebetween. . When the cylindrical vibration isolator is mounted on the automobile, the axial direction and the axis perpendicular direction of the cylindrical vibration isolator are set with respect to the automobile, and the target vehicle longitudinal direction, left and right direction, up and down direction, etc. The spring characteristics can be obtained.

  By the way, in the above-mentioned automotive cylinder vibration isolator, spring characteristics in the axial direction and the direction perpendicular to the axis are required separately. Therefore, in the cylindrical vibration isolator as shown in FIG. 7 of Patent Document 2 (Japanese Patent Laid-Open No. 03-287405), as a rubber elastic body disposed between the inner metal fitting and the outer metal fitting, from both sides in the axial direction. There has been proposed a structure in which a pair of tapered cylindrical rubbers that are gradually reduced in diameter toward the central portion in the axial direction are assembled in the axial direction. In particular, when such a tapered cylindrical rubber is employed, the centering action of the inner metal fitting and the outer cylinder fitting by the tapered surface is exhibited. As a result, for example, when a cylindrical vibration isolator is applied to a suspension member mount, the stability of the vehicle behavior during full braking or sudden acceleration is likely to be a problem. The effect of improving the stability of vehicle behavior can be expected.

  However, in the conventional cylindrical vibration isolator having such a tapered cylindrical rubber, the following three problems are inherent.

  First, when adjusting the spring characteristics in the direction perpendicular to the axis, it is difficult to form a straight through hole in the tapered cylindrical rubber as disclosed in Patent Document 3 (Japanese Patent Laid-Open No. 2004-239375). was there. This is because, even if the cover and the tapered cylindrical rubber have a split structure in the axial direction, the inner metal fitting and the outer cylindrical metal fitting have a tapered shape, so that it is difficult to perform die cutting in the axial direction.

  Secondly, since the mounting hole of the cylindrical vibration isolator to the automobile itself needs a special shape of a double-sided tapered shape that gradually decreases in diameter from the axially open side part toward the axially central part, There was a problem that the formation of the mounting hole itself was difficult.

  Third, in order to assemble a pair of tapered cylindrical rubbers that gradually decrease in diameter from the axially opposite side parts toward the axially central part, the cylindrical vibration isolator is equipped with an inner metal fitting, an outer cylindrical metal fitting, and a tapered cylinder. It is composed of a pair of split bodies that are formed by dividing the shape rubber in the axial direction, and the pair of split outer cylinder brackets constituting the outer cylinder bracket are mounted from both sides in the axial direction of the mounting hole and the inner bracket is configured. Since it is necessary to insert the inner rod into the pair of split inner tube fittings and fix the pair of split inner tube fittings to each other, there is a problem that the mounting work of the cylindrical vibration isolator to the automobile becomes troublesome. . In addition, in order to secure the durability of the rubber, the mounting work is performed while the pair of divided bodies are tightened with the inner rods inserted in the axial direction and the pre-compression operation is performed until the pair of divided bodies abut against each other in the axial direction Had to do. For this reason, the rubber must be pre-compressed simultaneously with the mounting operation, which makes the mounting operation more difficult.

JP 07-158676 A Japanese Patent Laid-Open No. 03-287405 JP 2004-239375 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is that a large degree of freedom in design of the spring characteristics is ensured and the manufacture is facilitated. In addition, it is an object of the present invention to provide a novel method for manufacturing a tubular vibration isolator for an automobile that can be easily attached to the automobile.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible. Further, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or an invention that can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized based on thought.

  That is, the features of the present invention are: (a) a press-fit outer peripheral surface that is press-fitted into a mounting hole having a cylindrical inner peripheral surface, and a diameter that is gradually reduced from both axial opening end portions toward the axial central portion. A step of preparing an outer cylindrical member having a tapered inner peripheral surface, and (b) a tapered outer peripheral surface corresponding to the tapered inner peripheral surface on both sides in the axial direction of the outer cylindrical member. Providing a pair of inner divided bodies in which the tapered outer peripheral surface is opposed to the inner peripheral surface of the outer cylindrical member by a predetermined distance in the radial direction by being inserted from both sides in the direction, and (c) a pair of inner A step of vulcanizing and adhering the contact rubber elastic bodies to the radially opposing surfaces of either one of the divided body and the outer cylinder member, and (d) a pair of inner members from both axial sides of the outer cylinder member Each of the split bodies is inserted, and the inner divided bodies are connected and fixed to each other to form an integral inner shaft member, and the radially opposed surfaces of either the inner divided body or the outer cylinder member The inner shaft member is brought into contact with the outer cylindrical member by pressing the contact rubber elastic body formed by vulcanization and bonding to the radially opposing surface of the other of the inner divided body and the outer cylindrical member. And a step of elastically connecting the rubber elastic body through a rubber elastic body.

  According to such a method for manufacturing a tubular vibration isolator for an automobile of the present invention, the abutting rubber elastic body is either one of an inner divided body having a tapered outer peripheral surface and an outer cylindrical member having a tapered inner peripheral surface. It is vulcanized and bonded to the opposing surface in the radial direction, and the inner rubber member and the outer cylindrical member are centered from both sides in the axial direction by pressing the abutting rubber elastic body against the other opposing surface of the inner divided body and the outer cylindrical member. It becomes possible to elastically connect with a pair of tapered cylindrical rubber elastic bodies whose diameter is reduced toward. This simplifies the die-cutting structure when vulcanizing and molding the contact rubber elastic body, and ensures a large degree of design freedom for the contact rubber elastic body, the inner divided body, and the outer cylinder member.

  Further, since the outer peripheral surface of the outer cylindrical member is a press-fit outer peripheral surface that is press-fitted and fixed in a mounting hole having a cylindrical inner peripheral surface, the mounting hole has a tapered shape or the like for mounting a cylindrical vibration isolator. Therefore, it is not necessary to adopt a special shape, and the complicated shape of the mounting hole can be eliminated.

  Further, when the inner shaft member is configured by inserting a pair of inner divided bodies from both axial sides of the outer cylinder member and fixing them in the axial direction, the inner shaft member and the outer cylinder member are opposed to each other in the radial direction. Since the contact rubber elastic body vulcanized and bonded to either the inner divided body or the outer cylindrical member is pressed against the other, the assembly force in the axial direction of the pair of inner divided bodies is used. Thus, it is possible to apply a precompression force to the contact rubber elastic body between the opposed surfaces of the inner shaft member and the outer cylinder member. As a result, the durability of the contact rubber elastic body can be improved from the stage before being mounted on the automobile. There is no need to apply excessive compression force, or the pre-compression operation performed simultaneously with the mounting operation can be omitted.

  Therefore, according to the method for manufacturing a tubular vibration isolator for an automobile according to the present invention, a large degree of freedom in design of spring characteristics is ensured, and excellent anti-vibration performance, vehicle riding comfort, and driving stability are achieved according to the purpose. In addition to the above, the manufacture of a cylindrical vibration isolator having a pair of tapered cylindrical rubber elastic bodies and the operation of mounting it on an automobile can be facilitated.

  In the method for manufacturing a tubular vibration isolator for an automobile according to the present invention, the groove-like portion extending in the axial direction with the radial protrusion height being reduced at the portion facing the radial direction of the contact rubber elastic body. A method may be employed in which the hollow portion is formed between the radially opposed surfaces of the inner shaft member and the outer cylindrical member by the groove-shaped portion. According to such a method, the degree of freedom in tuning the spring characteristics can be further improved based on the shape, size, and the like of the cutout portion. In particular, since the thinned portion is formed between the groove-shaped portion of the abutting rubber elastic body and the inner shaft member or the outer cylindrical member that is opposed to the groove-shaped portion in the radial direction, the abutting rubber elastic body Complicating the die cutting structure due to the formation of the thinned portion inside is prevented, and the manufacture of the cylindrical vibration isolator having the thinned portion is facilitated.

  Moreover, in the manufacturing method of the cylindrical vibration isolator for automobiles according to the present invention, a method in which a contact rubber elastic body is vulcanized and bonded to the inner shaft member side may be employed. According to such a method, the inner peripheral surface side of the contact rubber elastic body is vulcanized and bonded to the inner shaft member. As a result, the bonding area of the contact rubber elastic body is reduced to the contact rubber elastic body. Manufacturing efficiency can be improved based on the fact that it is made smaller compared to the case where the outer cylinder member is bonded to the outer cylinder member, and the bonding operation is facilitated and the bonding time is shortened. Further, when the inner shaft member and the outer cylindrical member are elastically connected, the outer peripheral surface side of the abutting rubber elastic body is pressed against the radially opposing surface of the outer cylindrical member to the inner shaft member. As a result, the abutting rubber elastic body As compared with the case where the inner peripheral surface side is pressed against the inner shaft member, the contact area can be increased. Therefore, the contact area is effectively ensured, and an effect of improving durability by avoiding stress concentration of the contact rubber elastic body can be obtained.

  Further, in the method for manufacturing a tubular anti-vibration device for an automobile according to the present invention, the inner peripheral surface of the outer cylindrical member is positioned at the axially inner end of the contact area of the contact rubber elastic body on both axial sides. Then, a method in which a step-shaped positioning portion extending in the circumferential direction with a large inclination angle is formed may be employed. According to such a method, the inner divided body is inserted from both sides in the axial direction of the outer cylinder member, and the outer peripheral surface of the abutting rubber elastic body is pressed against the surface of the outer cylinder member facing the inner shaft member to abut. When the rubber elastic body is elastically deformed, the axially inner end portion of the contact rubber elastic body is supported by the positioning portion. Therefore, when the abutting rubber elastic body is elastically deformed, the abutting rubber elastic body on one side in the axial direction protrudes to the other side in the axial direction beyond the minimum diameter portion of the axial central portion of the outer cylinder member. Inconveniences such as a change in spring characteristics and a decrease in durability, which are caused by the failure, can be avoided by a simple method.

  In the method for manufacturing a tubular vibration isolator for an automobile according to the present invention, the rubber volume of the contact rubber elastic body disposed between the outer cylindrical member and the inner divided body on one axial side is the outer. The contact rubber elastic body disposed between the cylindrical member and the inner divided body on the other side in the axial direction is larger than the rubber volume of the contact rubber elastic body. A method in which the elastic body is on the compression acting side of the initial load may be adopted. According to such a method, since the rubber volume of the elastic rubber body on the compression action side that is subjected to a large load by the initial load and the vibration load is increased, excessive stress generation can be suppressed. The durability performance of the rubber elastic body can be exhibited more advantageously.

  In addition, the taper outer surface of the inner divided body on one side in the axial direction or the outer cylindrical member that is vulcanized or adhered to the rubber elastic body on one side in the axial direction where the rubber volume is increased is provided. The taper angle on the taper inner peripheral surface is desirably smaller than the taper angle on the other side in the axial direction. This is because the rubber volume of the abutting rubber elastic body can be more advantageously ensured by further increasing the axial dimension while suppressing the increase in the maximum outer diameter of the inner divided body and the outer cylindrical member. Also, in order to secure the rubber volume, the radial dimension of the abutting rubber elastic body on one side in the axial direction that is increased is larger than the radial dimension of the abutting rubber elastic body on the other side in the axial direction. It is desirable to make it larger.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described. First, in FIGS. 1 to 3, an automotive suspension member mount 10 as a first embodiment according to an automotive tubular vibration isolator manufactured by the automotive tubular vibration isolator manufacturing method of the present invention is shown. It is shown. In the suspension member mount 10 for an automobile, an inner cylinder fitting 12 as an inner shaft member and an outer cylinder fitting 14 as an outer cylinder member are disposed at a predetermined distance in the radial direction and are interposed therebetween. The contact rubber elastic body 16 is elastically connected.

  For example, as shown in FIG. 1 of Patent Document 2 (Japanese Patent Laid-Open No. 03-287405), such a suspension member mount 10 for automobiles has suspension members (subframes) as suspension arms and links. It can be employed for a well-known subframe type suspension device that is attached to the vehicle body. The inner cylinder fitting 12 is attached to the attachment member on the vehicle body side, and the outer cylinder fitting 14 is attached to the suspension member, so that the suspension member is supported by the vehicle body via the suspension member mount 10 for vibration isolation. (See FIG. 12).

  1 to 3 show a state in which the automobile suspension member mount 10 is not attached to the automobile. However, in the state in which the automobile suspension member mount 10 is attached to the automobile, the vehicle is substantially in the mount axis direction (up and down in FIG. 1). As the support rubber elastic body 16 is elastically deformed by a shared support load such as a body, the inner cylinder fitting 12 is displaced with respect to the outer cylinder fitting 14 in the mount axis direction. In the following description, the vertical direction means the vertical direction in FIG. 1 unless otherwise specified.

  More specifically, as shown in FIGS. 4 to 6, the outer cylinder fitting 14 has a large-diameter substantially cylindrical shape. An outer flange-shaped portion 18 that extends in the shape of a substantially annular plate in the radial direction is integrally formed at the lower end portion of the outer cylinder fitting 14. In the outer flange-shaped portion 18, two locations on the circumference opposed to each other in one radial direction (left and right in FIGS. 2 to 5) sandwiching the central axis of the outer cylindrical metal fitting 14 are respectively arranged from the radially intermediate portion to the outer circumference. A positioning notch 20 is formed in the surface to open in a concave shape. Further, a stopper portion 22 is integrally formed and protrudes downward in a region extending from the inner peripheral edge portion of the lower end of the outer tubular metal fitting 14 to the radially intermediate portion of the outer flange-shaped portion 18. The stopper portion 22 extends continuously in the circumferential direction with a substantially trapezoidal cross section whose width dimension decreases downward.

  The outer peripheral surface excluding the outer flange-shaped portion 18 and the stopper portion 22 in the outer cylinder fitting 14 is a cylindrical press-fit outer peripheral surface 24 that extends in the axial direction with a substantially constant outer diameter. A thin-walled outer peripheral rubber layer 26 is formed on the press-fitted outer peripheral surface 24 so as to cover almost the entire lower end edge from the vicinity of the upper end edge. In particular, the outer peripheral surface of the outer peripheral rubber layer 26 has a configuration in which a plurality of substantially triangular protrusions with a radial protrusion dimension that decreases upward are provided at a predetermined distance in the axial direction and the circumferential direction. . Further, an outer peripheral rubber layer 26 having a substantially constant thickness is deposited on the outer flange-shaped portion 18 having the notch portion 20 throughout. Further, a shock absorbing rubber 28 formed integrally with the outer peripheral rubber layer 26 is attached to the protruding front end surface below the stopper portion 22. The buffer rubber 28 may extend with a substantially constant thickness dimension in the circumferential direction. However, in this embodiment, the thickness dimension of the buffer rubber 28 is different in the circumferential direction, and the thick rubber having a large thickness dimension is used. Four parts are formed at equal intervals in the circumferential direction. The outer peripheral rubber layer 26 and the buffer rubber 28 are integrally vulcanized and molded together with the outer cylinder fitting 14 to form an integrally vulcanized molded product including the outer cylinder fitting 14.

  The inner peripheral surface of the outer cylindrical metal member 14 includes a first tapered inner peripheral surface 30 and a second tapered inner peripheral surface 32 as tapered inner peripheral surfaces. These first and second taper inner peripheral surfaces 30, 32 have taper shapes that gradually decrease in diameter from the both side end edges in the axial direction of the outer cylindrical fitting 14 toward the central portion in the axial direction. The end portions on the small diameter side of the second taper inner peripheral surfaces 30, 32 are in contact with each other at the intermediate portion in the axial direction of the outer cylinder fitting 14. Thereby, the inner diameter dimension of the part which the small diameter side edge part of the 1st and 2nd taper inner peripheral surfaces 30 and 32 mutually contacts in the outer cylinder metal fitting 14 is made the smallest. In particular, in the present embodiment, the first taper inner peripheral surface 30 and the second taper inner peripheral surface 32 are related to the taper angle represented by the angle at which the generatrix of the taper inner peripheral surface is inclined with respect to the central axis of the outer cylinder fitting 14. They are almost the same. Further, since the axial dimension of the second taper inner peripheral surface 32 is made larger than the axial dimension of the first taper inner peripheral surface 30, the first and second taper inner peripheral surfaces in the outer cylinder fitting 14 are obtained. The portion where the small-diameter side ends of 30 and 32 are in contact with each other, in other words, the smallest diameter portion of the outer cylinder fitting 14 is on one side in the axial direction relative to the axial central portion of the outer cylinder fitting 14 (in FIG. ). In short, in the present embodiment, the first tapered inner peripheral surface 30 and the second tapered inner peripheral surface 32 are asymmetric in the axial direction.

  Further, the first and second tapered inner peripheral surfaces 30 in one radial direction (left and right in FIGS. 2 to 5) in which the pair of notches 20 and 20 are opposed to each other with the central axis of the outer cylindrical metal member 14 being sandwiched therebetween. , 32 are formed with positioning protrusions 34 as positioning portions at the minimum diameter portion of the outer cylindrical metal fitting 14 where the small diameter side ends thereof are in contact with each other. The positioning projection 34 is a cross-section in which the first tapered inner peripheral surface 30 and the second tapered inner peripheral surface 32 are recessed from each large diameter side end to the vicinity of each small diameter side end with a substantially constant depth. By extending the shape in the circumferential direction with a length of a little less than a half circumference, it is a cross-sectional shape protruding radially inward from the recessed portions of the first and second taper inner circumferential surfaces 30, 32, and the length of the circumference slightly less than a half circumference It extends in the length. The cross-sectional shape of the positioning protrusion 34 is a tapered shape such as a substantially hemispherical shape or a substantially triangular shape in which the axial dimension decreases inward in the radial direction. In the present embodiment, one surface in the axial direction (on the upper side in FIGS. 1 and 6) located on the small diameter side end portion side of the first taper inner circumferential surface 30 across the protruding tip portion of the positioning protrusion 34 and the second taper. The other axial side surface (in FIGS. 1 and 6, the lower side) of the inner peripheral surface 32 located on the small diameter end portion side is the small diameter end portion of the first tapered inner peripheral surface 30 or the second tapered inner peripheral surface 32. Each is inclined so as to rise radially inward from the end portion on the small diameter side. That is, the inclination angle with respect to the axial direction of the outer cylindrical fitting 14 at both end faces sandwiching the protruding tip portion of the positioning projection 34 in the axial direction is the outer cylindrical fitting of each of the first tapered inner circumferential surface 30 and the second tapered inner circumferential surface 32. As a result, the positioning protrusion 34 formed on the inner peripheral surface of the outer cylindrical metal member 14 is within the first taper constituting the inner peripheral surface. It is made into the level | step difference shape extended in the circumferential direction with a larger inclination angle than the surrounding surface 30 or the 2nd taper inner peripheral surface 32. As shown in FIG.

  On the other hand, the inner cylinder fitting 12 includes a first inner cylinder fitting 36 and a second inner cylinder fitting 38. As shown in FIGS. 7 and 8, the first inner cylindrical fitting 36 as one inner divided body has a substantially cylindrical shape with a small diameter. A taper-shaped portion that decreases in diameter downward is formed in the axially intermediate portion of the inner peripheral surface of the first inner tube-fitting 36, so that the taper-shaped portion inside the first inner tube-fitting 36 is formed. The lower side in the axial direction across the gap is a small-diameter cylindrical small-diameter press-fit portion 40.

  Further, the outer peripheral surface from the substantially central portion in the axial direction of the first inner cylindrical metal fitting 36 to the lower end portion is a first tapered outer peripheral surface 42 as a tapered outer peripheral surface that gradually decreases in diameter downward. In the present embodiment, the taper angle of the first tapered outer peripheral surface 42 represented by the angle at which the generatrix of the first tapered outer peripheral surface 42 is inclined with respect to the central axis of the first inner cylindrical metal member 36 is The taper angle of the first taper inner peripheral surface 30 with respect to the central axis is substantially the same. A first contact rubber elastic body 44 is provided on the first tapered outer peripheral surface 42.

  The first abutting rubber elastic body 44 has a cylindrical shape extending in the circumferential direction with a substantially constant rectangular cross section along the first tapered outer peripheral surface 42, and the center of the first inner cylindrical metal fitting 36 on the inner and outer peripheral surfaces thereof. The inclination angle with respect to the axis is substantially the same as the taper angle of the first taper outer peripheral surface 42. In addition, before the first inner cylindrical fitting 36 is assembled to the outer cylindrical fitting 14, the upper end surface of the first abutting rubber elastic body 44 is outer peripheral in the axial direction across the boundary between the upper end surface and the outer peripheral surface. The first contact rubber elastic body 44 is inclined substantially symmetrically with respect to the surface, and a lower hole of the first contact rubber elastic body 44 has a straight hole 46 for avoiding stress concentration at the lower end portion of the first contact rubber elastic body 44. Is provided. Since the inner peripheral surface of the first abutting rubber elastic body 44 is vulcanized and bonded to the first tapered outer peripheral surface 42, the first abutting rubber elastic body 44 allows a part of the inner cylindrical fitting 12 to be partly bonded. The first inner cylindrical metal fitting 36 is fixed. In other words, in the present embodiment, the first abutting rubber elastic body 44 is integrally vulcanized and molded together with the first inner cylinder fitting 36, so that the first integral addition including the first inner cylinder fitting 36 is performed. It is configured as a sulfur molded product 48.

  In particular, in the present embodiment, a portion of the first abutting rubber elastic body 44 that is opposed to each other in one radial direction (left and right in FIG. 7) across the central axis of the first inner cylindrical metal fitting 36 has a circumferential direction. A groove-like portion 50 extending in a length shorter than a half circumference is formed. The groove-like portion 50 is opened on the outer peripheral surface of the first abutting rubber elastic body 44 by reducing the height of the first abutting rubber elastic body 44 protruding radially outward from the first tapered outer peripheral surface 42. The first contact rubber elastic body 44 extends in the axial direction and opens at the upper and lower end surfaces. In the present embodiment, a small first contact rubber elastic body 44 that protrudes outward in the radial direction with a slight height dimension from the first tapered outer peripheral surface 42 is provided at the circumferential central portion of the groove-like portion 50. However, the first contact rubber elastic body 44 is not provided in a region other than the central portion in the circumferential direction in the groove-like portion 50. That is, the first abutting rubber elastic body 44 is formed by separating the pair of groove-like portions 50 and 50 in the circumferential direction in the first abutting rubber elastic body 44 having a cylindrical shape. A pair of substantially arc-shaped block shapes substantially divided in the circumferential direction are formed.

  As shown in FIGS. 9 and 10, the second inner cylindrical fitting 38 as the other inner divided body has a substantially cylindrical shape with a small diameter. A stepped portion 52 that protrudes inward in the direction perpendicular to the axis is formed at a substantially central portion in the axial direction of the inner peripheral surface of the second inner tubular fitting 38, and a stepped portion inside the second inner tubular fitting 38. The upper side in the axial direction across 52 is a small-diameter cylindrical small-diameter press-fit portion 54. In addition, the width dimension in one radial direction (up and down in FIG. 3) is orthogonal to the one radial direction on the inner circumferential surface on the lower side in the axial direction across the stepped portion 52 in the second inner cylindrical metal fitting 38. By making it smaller than the width dimension in the direction (left and right in FIG. 3), the inner peripheral surface has a two-sided width structure.

  Further, the entire outer peripheral surface of the second inner cylindrical metal fitting 38 is a second tapered outer peripheral surface 56 as a tapered outer peripheral surface that gradually decreases in diameter upward. In the present embodiment, the taper angle of the second taper outer peripheral surface 56 represented by the angle at which the generatrix of the second taper outer peripheral surface 56 is inclined with respect to the central axis of the second inner cylindrical metal member 38 is The taper angle of the second tapered inner peripheral surface 32 with respect to the central axis is substantially the same. A second abutting rubber elastic body 58 is provided on the second tapered outer peripheral surface 56.

  The second contact rubber elastic body 58 is formed by inverting the first contact rubber elastic body 44 vulcanized and bonded to the first inner cylindrical metal fitting 36 in the axial direction (up and down in FIGS. 1 and 11). The contact rubber elastic body 44 has a substantially symmetrical cylindrical shape, and the inclination angle of the inner and outer peripheral surfaces of the second contact rubber elastic body 58 with respect to the central axis of the second inner cylindrical metal fitting 38 is the second taper outer peripheral surface. The taper angle is substantially the same as 56. Accordingly, the upper end surface of the second abutting rubber elastic body 58 has an upper end associated with the elastic deformation of the second abutting rubber elastic body 58 in a state before the second inner cylindrical metal fitting 38 is assembled to the outer cylinder fitting 14. A straight hole 60 is provided to avoid stress concentration in the portion. Since the inner peripheral surface of the second contact rubber elastic body 58 is vulcanized and bonded to the second taper outer peripheral surface 56, the second contact rubber elastic body 58 attaches the second inner cylindrical metal fitting 38 to the second contact rubber elastic body 58. The second integrated vulcanized molded product 62 is provided. Further, a portion of the second contact rubber elastic body 58 that is opposed to one another in the radial direction (left and right in FIG. 9) sandwiching the central axis of the second inner cylindrical metal member 38 has a first contact rubber elasticity. Similar to the body 44, the groove-shaped portion 64 is formed, so that the second abutting rubber elastic body 58 has a pair of substantially arc-shaped block shapes that are substantially divided in the circumferential direction. .

  In particular, in the present embodiment, the taper angle of the first taper outer peripheral surface 42 with respect to the central axis of the first inner cylindrical metal fitting 36 and the taper angle of the second taper outer peripheral surface 56 with respect to the central axis of the second inner cylindrical metal fitting 38 are mutually different. It is almost the same. Further, the axial dimension of the second tapered outer peripheral surface 56 is made larger than the axial dimension of the first tapered outer peripheral surface 42. Furthermore, the outer diameter dimension and the axial dimension of the second abutting rubber elastic body 58 are both larger than the outer diameter dimension and the axial dimension of the first abutting rubber elastic body 44. The rubber volume of the second contact rubber elastic body 58 is larger than the rubber volume of the first contact rubber elastic body 44. In addition, the taper angle of the first taper outer peripheral surface 42 with respect to the central axis of the first inner cylindrical fitting 36 is substantially the same as the taper angle of the first taper inner peripheral surface 30 with respect to the central axis of the outer cylindrical fitting 14, The first taper outer peripheral surface 42 has a shape corresponding to the first taper inner peripheral surface 30, and the taper angle of the second taper outer peripheral surface 56 with respect to the central axis of the second inner cylindrical metal fitting 38 is the second taper inner surface. The taper angle of the peripheral surface 32 with respect to the central axis of the outer cylinder fitting 14 is substantially the same, and the second tapered outer peripheral surface 56 has a shape corresponding to the second tapered inner peripheral surface 32.

  The first integral vulcanized molded product 48 and the second integral vulcanized molded product are formed such that the central axes of the first and second inner cylindrical metal fittings 36 and 38 and the outer cylindrical metal fitting 14 are positioned on the same line. 62 are inserted from both axial sides of the outer cylindrical fitting 14 toward the central portion in the axial direction, and in the axial intermediate portion inside the outer cylindrical fitting 14, the lower end surface of the first inner cylindrical fitting 36 and the second The upper end surface of the inner cylindrical metal fitting 38 is overlapped in the axial direction. The small diameter press-fit portion 40 of the first inner cylindrical fitting 36 and the small diameter press-fit portion 54 of the second inner cylindrical fitting 38 are aligned with each other in the direction perpendicular to the axis. A press-fit fitting 66 having a shape is press-fitted and fixed. The press-fit ends of the press-fit metal fitting 66 into the small-diameter press-fit portions 40 and 54 are defined by the lower end portion of the press-fit metal fitting 66 coming into contact with the stepped portion 52 of the second inner cylindrical metal fitting 38. As a result, the first inner cylindrical fitting 36 and the second inner cylindrical fitting 38 are connected and fixed to each other in the axial direction, so that the integral inner cylindrical fitting 12 is configured.

  Further, as the first integral vulcanized molded product 48 is inserted inward in the axial direction from the large-diameter end of the first taper inner peripheral surface 30 of the outer cylindrical metal member 14, the first contact rubber elastic body 44. The first taper inner peripheral surface 30 and the first taper outer peripheral surface 42 of the inner metal fitting 12 are opposed to each other at a predetermined distance in the radial direction. The first contact rubber elastic body 44 is compressed and deformed between the opposing surfaces. Further, as the second integral vulcanized molded product 62 is inserted inward in the axial direction from the large-diameter side end portion of the second tapered inner peripheral surface 32 of the outer cylinder fitting 14, the second abutting rubber elastic body 58. The second taper inner peripheral surface 32 and the second taper outer peripheral surface 56 of the inner tube fitting 12 are opposed to each other at a predetermined distance in the radial direction. The second contact rubber elastic body 58 is compressed and deformed between the opposing surfaces. In particular, the axially inner ends of the outer peripheral sides of the first and second abutting rubber elastic bodies 44 and 58 are overlapped and supported from both sides in the axial direction with respect to the positioning protrusions 34 of the outer cylinder fitting 14.

  Thereby, the inner cylinder metal fitting 12 and the outer cylinder metal fitting 14 are arrange | positioned concentrically, and are mutually elastically connected via the 1st and 2nd contact rubber elastic bodies 44 and 58. FIG. That is, in the present embodiment, the contact rubber elastic body 16 that elastically connects the inner and outer cylindrical metal members 12 and 14 includes the first contact rubber elastic body 44 and the second contact rubber elastic body 58.

  Each groove-like portion 50 of the first contact rubber elastic body 44 and each groove-like portion 64 of the second contact rubber elastic body 58 are opposed to each other in the axial direction, and the diameter of each groove-like portion 50 is also set. The inner surface in the direction and the inner surface in the radial direction of each groove-shaped portion 64 are opposed to the first taper inner peripheral surface 30 and the second taper inner peripheral surface 32 of the outer tube fitting 14 with a predetermined distance in the radial direction. It has been. As a result, the groove portions 50 and 64 and the first and second of the outer tube fitting 14 are provided at two locations on the circumference of the contact rubber elastic body 16 disposed between the inner tube fitting 12 and the outer tube fitting 14. The second taper inner peripheral surfaces 30 and 32 cooperate to form a hollow portion 68 extending through in the axial direction, and the hollow portions 68 and 68 have a diameter sandwiching the central axis of the mount 10. It is made to oppose in one direction (up and down in FIGS. 2-5). As a result, the spring constant in one radial direction in which the pair of cutout portions 68 and 68 are formed is sufficiently larger than the spring constant in the direction perpendicular to the one radial direction (left and right in FIGS. 2 to 5). Has been made smaller.

  In the suspension member mount 10 for an automobile having such a structure, the outer cylinder fitting 14 is fixed to the bracket fitting 70 when being mounted on the automobile. As shown in FIG. 12, the bracket fitting 70 has a large-diameter cylindrical shape, and an inner peripheral surface is a mounting hole 72 that extends in a cylindrical shape in the axial direction. That is, in the present embodiment, the entire mounting hole 72 is a cylindrical inner peripheral surface. Further, an inner flange-shaped portion 74 is integrally formed at the upper end portion of the bracket metal fitting 70, and an outer flange-shaped portion 76 is integrally formed at the lower end portion of the bracket metal fitting 70. The press-fitting outer peripheral surface 24 of the outer tubular metal fitting 14 is press-fitted into the mounting hole 72 of the bracket metal fitting 70 from below in the axial direction, and is fixed to the bracket metal fitting 70 via the outer peripheral rubber layer 26. In particular, by providing a plurality of small protrusions on the outer peripheral surface of the outer peripheral rubber layer 26, the contact area when the press-fitting outer peripheral surface 24 is pressed into the mounting hole 72 is reduced, and the radial dimensions of these protrusions are also reduced. Therefore, the load required for press-fitting is reduced, and the press-fitting work into the mounting hole 72 of the outer cylinder fitting 14 is facilitated. These small protrusions may be crushed as the outer peripheral rubber layer 26 is compressed and deformed between the outer cylinder fitting 14 and the bracket fitting 70. Further, the press-fitting end of the outer cylinder fitting 14 to the bracket fitting 70 is defined by the outer flange-like portion 18 of the outer cylinder fitting 14 being overlapped with the outer flange-like portion 76 of the bracket fitting 70. By mounting or forming the bracket fitting 70 on the suspension member, the outer cylinder fitting 14 is attached to the suspension member. In addition, since the outer cylinder fitting 14 and the bracket fitting 70 are press-fitted and fixed via the outer peripheral rubber layer 26, dimensional errors and assembly errors in the suspension member mount 10 for the automobile and the suspension member are caused by the outer peripheral rubber layer 26. The suspension member mount 10 for an automobile and the mounting hole 72 are arranged substantially concentrically. It should be noted that the spring constant in the direction perpendicular to the axis of the outer peripheral rubber layer 26 compressed and deformed between the outer cylinder fittings 14 mounted in the mounting holes 72 is the spring perpendicular to the axis of the contact rubber elastic body 16. It is sufficiently larger than the constant (the combined spring constant in the direction perpendicular to the axis of the first and second contact rubber elastic bodies 44, 58). As a result, when tuning the spring characteristics in the direction perpendicular to the axis of the suspension member 10 for an automobile, the spring constant in the direction perpendicular to the axis of the outer peripheral rubber layer 26 can be substantially excluded, and the spring characteristics can be reduced. Since tuning can be set based on the spring constant in the direction perpendicular to the axis, complicated tuning can be avoided.

  In addition, a long-axis nut fitting 78 is inserted from above with respect to the first inner cylinder fitting 36 of the inner cylinder fitting 12, and a hook-like shape protruding outward from the nut fitting 78 in the direction perpendicular to the axis. The portion 80 is positioned above the first inner tubular fitting 36, and the vehicle body 82 is sandwiched between the bowl-shaped portion 80 and the first inner tubular fitting 36. Further, the long-axis-shaped fixing bolt 84 is inserted into the second inner cylinder fitting 38 and the press-fitting fitting 66 from below the second inner cylinder fitting 38 of the inner cylinder fitting 12, and the distal end portion of the fixing bolt 84 is The nut fitting 78 is screwed and fixed in a screw hole 86 opened at the insertion tip portion. The vehicle body 82 is fixed to the inner cylinder fitting 12 on the basis of the screwing fixing force in the axial direction of the fixing bolt 84 and the nut fitting 78.

  Thus, the suspension member mount 10 for an automobile is interposed between the vehicle body 82 and the suspension member, and the suspension member is supported by the vehicle body 82 in a vibration-proof manner. When the suspension member mount 10 for an automobile is mounted on an automobile, the axial direction of the mount 10 is the vehicle vertical direction (the vertical direction in FIG. 12), and the pair of the hollow portions 68 and 68 are opposed to each other. One direction is the vehicle front-rear direction (paper direction in FIG. 12), and the direction orthogonal to the one radial direction is the vehicle left-right direction (left-right direction in FIG. 12). Further, the rubber volume of the second abutting rubber elastic body 58 is made larger than the rubber volume of the first abutting rubber elastic body 44, and this increased second abutting rubber elastic body 58 has an initial load. It is the compression action side.

  The vehicle body 82 and the inner flange portion 74 of the bracket fitting 70 are opposed to each other with a predetermined distance in the vehicle vertical direction, and a buffer rubber 88 is disposed between the opposed surfaces. Further, a hook-shaped metal fitting 90 having a substantially annular plate shape is sandwiched and fixed between the head portion of the fixing bolt 84 and the second inner cylindrical metal fitting 38, and the outer peripheral portion of the hook-shaped metal fitting 90 is provided with the buffer rubber 28. Is opposed to the stopper portion 22 of the outer cylinder fitting 14 in the vertical direction of the vehicle. Therefore, when vibration is input in the vehicle vertical direction and the inner cylinder fitting 12 and the outer cylinder fitting 14 are relatively displaced, the vehicle body 82 and the inner flange-like portion 74 of the bracket fitting 70 are interposed via the cushion rubber 88. The relative displacement between the inner tube fitting 12 and the outer tube fitting 14 is buffered by being overlapped or by overlapping the stopper portion 22 of the outer tube fitting 14 and the bowl-shaped fitting 90 via the buffer rubber 28. It is supposed to be limited to.

  In the present embodiment, the contact rubber elastic body 16 composed of the first and second contact rubber elastic bodies 44 and 58 is formed at the stage where the automobile suspension member mount 10 is configured. By compressing and deforming between the second taper outer peripheral surfaces 42 and 56 and the first and second taper inner peripheral surfaces 30 and 32 of the outer tube metal fitting 14, the target rubber elastic body 16 is preliminarily designed. A compressive force is exerted. However, the present embodiment is not limited to this, and, for example, in the stage of mounting the automobile suspension member mount 10 as described above to the automobile, the fixing screw 84 and the nut fitting 78 are fixed in the axial direction. Accordingly, the first and second tapered outer peripheral surfaces 42 and 56 of the inner cylindrical fitting 12 are displaced by the displacement of the first inner cylindrical fitting 36 and the second inner cylindrical fitting 38 in the axial direction. It is also possible to exert a desired pre-compression force on the abutting rubber elastic body 16 disposed between the first and second tapered inner peripheral surfaces 30 and 32 of the outer cylinder fitting 14. That is, in the latter case, an assembly is obtained by elastically connecting the inner cylinder fitting 12 and the outer cylinder fitting 14 via the contact rubber elastic body 16 as shown in FIG. As a result, the suspension member mount for an automobile in which a target pre-compression force is exerted on the contact rubber elastic body 16 at the same time as the mounting is configured.

  By the way, when manufacturing the automobile suspension member mount 10 of the present invention, the above-described outer cylinder fitting 14 and the first and second integrated vulcanized molded products 48 and 62 are separately manufactured and prepared. (A) a step of preparing the outer cylinder fitting 14 having the press-fitting outer circumferential surface 24 and the first and second inner circumferential surfaces 30 and 32; and (b) first and second tapered inner circumferential surfaces of the outer cylinder fitting 14. The first and second tapered outer peripheral surfaces 42 and 56 corresponding to 30 and 32 are provided, and are inserted into the outer cylinder fitting 14 from both axial sides so that The steps of preparing the first and second inner cylindrical fittings 36 and 38 in which the first and second tapered outer peripheral surfaces 42 and 56 are opposed to each other with a predetermined distance in the radial direction are performed in random order. (C) The first and second contact rubber elastic bodies 44 and 58 are vulcanized and bonded to the first and second tapered outer peripheral surfaces 42 and 56 of the first and second inner cylindrical fittings 36 and 38. . Thereby, the 1st and 2nd integral vulcanization molded products 48 and 62 are obtained. Hereinafter, (d) the process of forming the automobile suspension member mount 10 of the present embodiment by elastically connecting the inner cylinder fitting 12 to the outer cylinder fitting 14 via the contact rubber elastic body 16 will be described.

  That is, as shown also in FIG. 11, before inserting the second inner cylindrical fitting 38 into the outer cylindrical fitting 14, the press fitting fitting 66 is press-fitted into the small diameter press fitting portion 54 of the second inner cylindrical fitting 38 in advance. It fixes, and the axial direction edge part of the press-fit metal fitting 66 is made to contact | abut to the level | step-difference part 52. FIG. Then, the first and second integrated vulcanized molded products 48 and 62 and the central axis of the outer cylinder fitting 14 are positioned on the same line, and the first integrated vulcanized molded product 48 and the second integrated vulcanized molded product 48 are positioned. The sulfur molded product 62 is inserted from both sides in the axial direction of the outer tube fitting 14 toward the central portion in the axial direction. At that time, the groove-like portion 50 of the first abutting rubber elastic body 44 and the groove-like portion 64 of the second abutting rubber elastic body 58 are positioned so as to project each other in the axial direction. , 58 are positioned opposite to each other with the positioning projection 34 of the outer cylinder fitting 14 sandwiched in the axial direction.

  The outer peripheral surface of the first abutting rubber elastic body 44 is overlapped with the first tapered inner peripheral surface 30 of the outer cylinder fitting 14, and the first integral vulcanized molded product 48 is directed toward the axial center of the outer cylinder fitting 14. And the axial inner end of the first contact rubber elastic body 44 on the outer peripheral side is brought into contact with the positioning protrusion 34. In addition, the outer peripheral surface of the second abutting rubber elastic body 58 is inserted into the second taper of the outer cylinder fitting 14 at the same time as or before and after the first integral vulcanization molded article 48 is inserted into the outer cylinder fitting 14. The second integral vulcanized molded product 62 is displaced toward the center in the axial direction of the outer cylindrical metal member 14 while being superposed on the peripheral surface 32, and the axially inner end portion on the outer peripheral side of the second contact rubber elastic body 58. Is brought into contact with the positioning protrusion 34. Accordingly, the first and second contact rubber elastic bodies 44 and 58 are pressed against the first and second tapered inner peripheral surfaces 30 and 32 from the axially opposite sides of the outer cylindrical metal member 14 toward the center, respectively, and are elastically deformed.

  Thus, the axially upper half of the press-fit fitting 66 protruded upward from the small-diameter press-fit portion 54 of the second inner tubular fitting 38 in the axially intermediate portion inside the outer tubular fitting 14 is used as the first inner cylinder. The small diameter press-fit portion 40 of the metal fitting 36 is press-fitted and fixed, and the lower end surface of the first inner cylindrical metal fitting 36 and the upper end surface of the second inner cylindrical metal fitting 38 are overlapped in the axial direction. As a result, the first inner cylindrical fitting 36 and the second inner cylindrical fitting 38 are connected and fixed to each other in the axial direction to constitute an integral inner cylindrical fitting 12.

  Further, the inner cylindrical metal member 12 is configured, and the first contact rubber elastic body 44 and the second contact rubber elastic body 58 finish elastic deformation, so that the first and second contact rubber elastic bodies 44 and 58 The inner end in the axial direction on the outer peripheral side is locked and supported with respect to the positioning protrusion 34 of the outer cylinder fitting 14. As a result, the first taper inner peripheral surface 30 of the outer cylinder fitting 14 and the first taper outer circumference 42 of the inner cylinder fitting 12 are opposed to each other at a predetermined distance in the radial direction, and the first contact is made between the opposed surfaces. The rubber elastic body 44 is disposed in a compressed and deformed state, and the second taper inner peripheral surface 32 of the outer cylindrical metal fitting 14 and the second taper outer peripheral surface 56 of the inner cylindrical metal fitting 12 are opposed to each other at a predetermined distance in the radial direction. At least, the second contact rubber elastic body 58 is disposed between the opposing surfaces in a state of being compressed and deformed. As a result, the inner cylinder fitting 12 and the outer cylinder fitting 14 are arranged concentrically and elastically with each other via the contact rubber elastic body 16 composed of the first and second contact rubber elastic bodies 44 and 58. Connect.

  Further, the radially inner side surfaces of the respective groove-like portions 50 and 64 that do not substantially constitute the first abutting rubber elastic body 44 and the second abutting rubber elastic body 58 and the first and second taper inside of the outer cylindrical metal fitting 14. The peripheral surfaces 30 and 32 cooperate to form hollow portions 68 and 68 extending in the axial direction in one radial direction (up and down in FIGS. 2 and 3) sandwiching the central axis of the mount 10. . Thereby, (d) the step of elastically connecting the inner cylinder fitting 12 to the outer cylinder fitting 14 via the contact rubber elastic body 16 is completed, and the automobile suspension member mount 10 as shown in FIGS. Can be realized.

  Therefore, in the automobile suspension bush 10 manufactured using the manufacturing method as described above, a pair of tapered cylindrical shapes in which the inner cylinder fitting 12 and the outer cylinder fitting 14 are reduced in diameter from both axial sides toward the axial middle portion. Since the contact rubber elastic bodies 44 and 58 are elastically connected, the centering action of the inner cylinder fitting 12 and the outer cylinder fitting 14 by the tapered surface is exhibited. As a result, an effect of stabilizing the vehicle behavior can be achieved based on the centering action by the tapered surface during full braking or sudden acceleration.

  Therefore, in the present embodiment, the contact rubber elastic body 16 is divided in the axial direction, and is configured by the first contact rubber elastic body 44 and the second contact rubber elastic body 58, and these first contact rubber elastic bodies 58 are formed. The rubber elastic body 44 and the second contact rubber elastic body 58 are vulcanized and bonded to the first inner cylinder fitting 36 and the second inner cylinder fitting 38. Further, the first abutting rubber elastic body 44 and the second abutting rubber elastic body 58 are pressed against the first and second tapered inner peripheral surfaces 30 and 32 of the outer cylinder metal fitting 14, so that the inner cylinder metal fitting 12 and the outer cylinder metal fitting are pressed. 14 are elastically connected to each other by a contact rubber elastic body 16. This eliminates the need to vulcanize and mold the contact rubber elastic body 16 between the opposed surfaces of the pair of metal fittings having the taper inner peripheral surface and the taper outer peripheral surface. In addition to being simplified, the degree of freedom in designing the contact rubber elastic body 16, the inner cylinder fitting 12, and the outer cylinder fitting 14 is greatly ensured.

  In addition, since the press-fit outer peripheral surface 24 having a cylindrical shape of the outer cylinder fitting 14 is press-fitted and fixed in the cylindrical attachment hole 72, the outer cylinder fitting 14 is attached to the suspension member. The complicated shape of the mounting hole 72 is eliminated, and the manufacture of the outer cylinder fitting 14 and the bracket fitting 70 is simplified.

  Further, in the present embodiment, the first and second inner cylindrical fittings 36 and 38 are inserted from both axial sides of the outer cylindrical fitting 14 and are fixed to each other in the axial direction to constitute the inner cylindrical fitting 12 and the inner cylinder. When the metal fitting 12 and the outer cylinder metal fitting 14 are opposed to each other in the radial direction, the first and second contact rubber elastic bodies 44 and 58 are pressed against the first and second tapered inner circumferential surfaces 30 and 32. A precompression force is applied to the first and second abutting rubber elastic bodies 44 and 58 by utilizing the axial assembly force of the first and second inner cylindrical fittings 36 and 38. As a result, it is not necessary to apply an excessive precompression force to the contact rubber elastic body 16 simultaneously with the mounting operation of the automotive suspension member mount 10 to the vehicle, and the mounting operation is facilitated.

  Therefore, according to the manufacturing method of the suspension member mount 10 for automobiles according to the present embodiment, the design freedom of the spring characteristics is largely ensured, and excellent vehicle riding comfort, steering stability, etc. can be obtained. Manufacture of the mount 10 provided with the tapered cylindrical first and second abutting rubber elastic bodies 44 and 58 and mounting work on the automobile can be facilitated.

  Further, in this embodiment, the contact rubber elastic body 16 is vulcanized and bonded to the inner cylinder fitting 12 side, and therefore, when the inner cylinder fitting 12 and the outer cylinder fitting 14 are elastically connected, the contact rubber elastic body 16 The outer peripheral surface side is pressed against the inner peripheral surface of the outer cylinder fitting 14, and as a result, the contact area is increased as compared with the case where the inner peripheral surface side of the contact rubber elastic body 16 is pressed against the inner cylinder fitting. It is done. Therefore, the contact area is effectively ensured, and an effect of improving durability by avoiding stress concentration of the contact rubber elastic body 16 can be obtained.

  However, the present invention is not limited to the first embodiment. For example, as shown in FIG. 13, the first and second abutting rubber elasticity are used in the second embodiment of the present invention. The outer peripheral surfaces of the bodies 44 and 58 may be vulcanized and bonded to the first taper inner peripheral surface 30 and the second taper inner peripheral surface 32 of the outer cylinder fitting 14. In that case, when the inner cylinder fitting 12 and the outer cylinder fitting 14 are assembled, the inner peripheral surfaces of the first and second contact rubber elastic bodies 44 and 58 are first and second of the inner cylinder fitting 12 from the outside in the axial direction. The taper outer peripheral surfaces 42 and 56 are superimposed on (pressed against) the taper outer peripheral surfaces 42 and 56 (see FIG. 14), but the taper outer peripheral surfaces 42 are provided at the axially outer ends of the first and second inner cylindrical metal fittings 36 and 38, respectively. , 56 are provided with positioning protrusions 92, 94 as positioning portions having an inclination angle larger than the taper angle, and the inner peripheral surfaces of the first and second contact rubber elastic bodies 44, 58 are the first and second When pressed against the tapered outer peripheral surfaces 42, 56, the axially outer ends of the first and second contact rubber elastic bodies 44, 58 are in contact with and supported by the positioning protrusions 92, 94, thereby abutting rubber. When the elastic body 16 is elastically deformed, the inner cylinder fitting 12 and the outer cylinder fitting 12 By suppressing the inter-fourth diametrically opposed faces for excessive bulging axially outward, the desired spring characteristics may be stably obtained. The positioning projections 92 and 94 are partially formed in the circumferential direction only at the portion of the inner cylindrical metal member 12 that contacts the axial end portion of the contact rubber elastic body 16 at the axial end portion. It may extend continuously in the circumferential direction at the axial end of the tubular fitting 12. Further, in the second embodiment, members and parts having substantially the same structure as those of the first embodiment are denoted by the same reference numerals as those of the above-described embodiment in the drawing, and those members and parts are denoted by the same reference numerals. Detailed description is omitted.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the specific descriptions in these embodiments, and various changes, modifications, and improvements based on the knowledge of those skilled in the art. Needless to say, any of these embodiments can be included in the scope of the present invention without departing from the spirit of the present invention.

  For example, in the first and second embodiments, the inner peripheral surfaces of the first contact rubber elastic body 44 and the second contact rubber elastic body 58 are the first and second tapered outer peripheral surfaces 42 of the inner cylinder fitting 12. , 56 is vulcanized and bonded so that the outer peripheral surfaces of the contact rubber elastic bodies 44, 58 are superposed on the first and second taper inner peripheral surfaces 30, 32 of the outer tube fitting 14, or the first contact The outer peripheral surfaces of the rubber elastic body 44 and the second abutting rubber elastic body 58 are vulcanized and bonded to the first and second taper inner peripheral surfaces 30 and 32 of the outer cylinder fitting 14, and the abutting rubber elastic body 44, 58, the inner peripheral surfaces of the first and second tapered outer peripheral surfaces 42 and 56 of the inner cylindrical metal member 12 are overlapped with each other. One side is vulcanized and bonded to the first taper outer peripheral surface of the inner cylinder fitting, and the other outer peripheral surface is vulcanized to the second taper inner peripheral surface of the outer cylinder fitting. Then, the outer peripheral surface of one of the first and second contact rubber elastic bodies is overlapped with the first tapered inner peripheral surface of the outer cylinder fitting, and the other inner surface of the first and second contact rubber elastic bodies is It is also possible to overlap the peripheral surface with the second tapered outer peripheral surface of the inner cylinder fitting.

  Further, for example, in the second embodiment, in order to effectively secure the contact area of the inner cylindrical fitting with the first and second tapered outer peripheral surfaces in the first and second contact rubber elastic bodies, the contact rubber A flat surface extending in a circumferential direction with a predetermined width is formed on the first and second tapered outer peripheral surfaces of the inner cylindrical metal fitting over the entire length in the circumferential direction at a portion of the elastic body that is opposed to the formation portion of the pair of cutout portions in the radial direction. It may be formed and the inner peripheral surfaces of the first and second contact rubber elastic bodies may be brought into contact with the flat surface.

  In addition, in the above-described embodiments, specific examples of applying the present invention to a suspension member mount for automobiles have been described. However, the present invention can be applied to automobile engine mounts, body mounts, differential mounts, suspension bushings, and other automobiles. Needless to say, the present invention is applicable to various types of cylindrical vibration isolators.

It is a longitudinal cross-sectional view of the suspension member mount for motor vehicles obtained by the manufacturing method of the cylindrical vibration isolator for motor vehicles as 1st embodiment of this invention, Comprising: The figure equivalent to the II cross section of FIG. The top view of the suspension member mount for the said motor vehicles. The bottom view of the suspension member mount for the said cars. The top view of the outer cylinder metal fitting which comprises a part of suspension member mount for the vehicles. The bottom view of the outer cylinder metal fitting. VI-VI sectional drawing of FIG. The top view of the 1st integral vulcanization molded product which comprises a part of suspension member mount for the said motor vehicles. VIII-VIII sectional drawing of FIG. The top view of the 2nd integral vulcanization molded product which comprises a part of suspension member mount for the vehicles. XX sectional drawing of FIG. The longitudinal cross-sectional view which shows one manufacturing process of the suspension member mount for the said motor vehicles. The longitudinal cross-sectional view which shows the state which assembled | attached the suspension member mount for the said vehicles to the motor vehicle. The longitudinal cross-sectional view of the suspension member mount for motor vehicles obtained by the manufacturing method of the cylindrical vibration isolator for motor vehicles as 2nd embodiment of this invention. The longitudinal cross-sectional view which shows one manufacturing process of the suspension member mount for the said motor vehicles.

Explanation of symbols

10: suspension member mount for automobile, 12: inner cylinder fitting, 14: outer cylinder fitting, 16: contact rubber elastic body, 24: press-fit outer circumference, 30: first taper inner circumference, 32: second taper inner circumference 36: first inner cylindrical fitting, 38: second inner cylindrical fitting, 42: first tapered outer peripheral surface, 44: first contact rubber elastic body, 56: second tapered outer peripheral surface, 58: second Contact rubber elastic body

Claims (5)

A step of preparing an outer cylindrical member having a press-fit outer peripheral surface that is press-fitted into a mounting hole having a cylindrical inner peripheral surface, and a tapered inner peripheral surface that gradually decreases in diameter from the both axial opening portions toward the central portion in the axial direction. When,
Tapered outer peripheral surfaces corresponding to the tapered inner peripheral surfaces on both axial sides of the outer cylindrical member are provided, respectively, and inserted into the outer cylindrical member from both axial sides to the inner peripheral surface of the outer cylindrical member. A step of preparing a pair of inner divided bodies in which the tapered outer peripheral surfaces are opposed to each other at a predetermined distance in the radial direction;
Vulcanizing and bonding the contact rubber elastic bodies to the radially opposing surfaces of either the pair of inner divided bodies and the outer cylindrical member;
The pair of inner divided bodies are inserted from both axial sides of the outer cylindrical member, and the inner divided bodies are connected and fixed together to form an integral inner shaft member. The abutting rubber elastic body formed by vulcanization and bonding to the radially opposing surface of either one of the outer cylinder members is disposed on the radially opposing surface of the other of the inner divided body and the outer cylinder member. And a step of elastically connecting the inner shaft member to the outer cylinder member through a corresponding rubber contact body by pressing.   A radially projecting height is reduced at a portion opposing the radial direction of the abutting rubber elastic body to form a groove-shaped portion extending in the axial direction, and the inner shaft member and the outer cylinder member are formed by the groove-shaped portion. The manufacturing method of the cylindrical vibration isolator for motor vehicles of Claim 1 which forms a hollow part between the radial direction opposing surfaces.   The method for manufacturing a tubular vibration isolator for an automobile according to claim 1 or 2, wherein the abutting rubber elastic body is vulcanized and bonded to the inner shaft member side.   On the inner peripheral surface of the outer cylinder member, a step-like positioning is provided at the inner end in the axial direction of the contact area of the contact rubber elastic body on both sides in the axial direction, and the inclination angle is increased to extend in the circumferential direction. The manufacturing method of the cylindrical vibration isolator for motor vehicles of Claim 3 in which the part is formed.   A rubber volume of the abutting rubber elastic body disposed between the outer cylindrical member and the inner divided body on one axial side is between the outer cylindrical member and the inner divided body on the other axial side. The contact rubber elastic body is larger than the rubber volume of the abutting rubber elastic body, and the corresponding rubber elastic body on one side in the axial direction is used as the compression action side of the initial load. The manufacturing method of the cylindrical vibration isolator for motor vehicles as described in any one of Claims 1 thru | or 4.

Images