JP2011220477A - Spring - Google Patents

Abstract

Provided is a spring which can be set to a low height, and thereby can cope with a place having a small installation space.
A contact portion of a first cylindrical portion has a reinforcing portion that protrudes inward in the radial direction of a hole, and therefore, a first member in the first cylindrical portion. The rigidity of the side end can be increased. Since the contact portion of the second cylindrical portion 12 has the reinforcing portion 22 that protrudes toward the outside in the radial direction of the hole portion 10A, the end portion of the second cylindrical portion 12 on the second member 102 side. The rigidity of can be increased. As a result, even when the height of the cylindrical portions 11 and 12 is lowered, when the corner portions 13 and 14 are elastically deformed when a load is applied, the end portions of the counterpart members 101 and 102 in the cylindrical portions 11 and 12 are not affected. Deformation can be prevented.
[Selection] Figure 1

Description

  The present invention relates to a spring that suppresses transmission of high-frequency vibration from a mating member, and more particularly to improvement of the shape of the spring.

  In various fields such as the automobile industry, precision equipment industry, home appliances, and architecture, a technology for suppressing vibration transmission is required. Vibration transmission suppression technology is applied to engines, motors rotating at high speeds, washing machine dewatering tanks, buildings, and the like. As a technique for suppressing vibration transmission, it is effective to set the natural frequency of a system composed of an object and a support sufficiently lower than a predetermined frequency band. As a technique, it is conceivable to reduce the spring constant of the support part. In this case, when a coil spring or a leaf spring is used as the support part, if the spring constant is reduced, a large deflection is required to support a high load. Is required, and the spring becomes large.

  Therefore, a method using a disc spring between the object and the support has been proposed (for example, Patent Documents 1 and 2). Since the load characteristic of the disc spring can be designed as a curve shown in FIG. 6, it is possible to set a substantially flat region A that can support a high load and set a small spring constant.

  When the disc spring is deformed so as to have a substantially flat shape when a load is applied, the inner peripheral edge and the outer peripheral edge of the disc spring slide against the mating member to generate friction. For this reason, when the use range of the disc spring is set to the range of the substantially flat region A in FIG. 6, the hysteresis shown in FIG. 7A occurs in the actual load curve. As a result, the substantial dynamic spring constant in the usage range of the disc spring is the inclination of the diagonal line l connecting the point P and the point Q in FIG. In this case, when the amplitude of the use range is reduced, the slope of the diagonal line l is increased as shown in FIG. 7B, so that the dynamic spring constant is increased. In a system in which a disc spring is applied in this way, when a small amplitude vibration such as a high frequency vibration is input, the dynamic spring constant of the disc spring increases, so that the natural frequency of the system increases. There was a problem that the transmission of vibration could not be suppressed.

JP-A-5-172171 JP 2002-54685 A

  In order to solve the above problems, the present applicant has proposed a spring 200 shown in FIG. 8 (for example, JP 2009-275738 A). 8A and 8B show the configuration of the spring 200, where FIG. 8A is a perspective view and FIG. 8B is a cross-sectional view of the right side portion of the spring 200. FIG. 8B shows a state where the spring 200 is installed between the first member 101 and the second member 102. The spring 200 includes a main body 210 having a hole 210A formed at the center. The main body 210 has the same shape as a disc spring and has a function as a disc spring.

  A first cylindrical portion 211 protruding toward the first member 101 is provided on the inner peripheral portion of the main body portion 210, and a second cylinder protruding toward the second member 102 is provided on the outer peripheral portion of the main body portion 210. A shaped portion 212 is provided. A first corner 213 is formed at the boundary between the main body 210 and the first cylindrical portion 211, and a second corner 214 is formed at the boundary between the main body 210 and the second cylindrical portion 212. Yes.

  In the spring 200, the corner portions 213 and 214 can be elastically deformed so as to change the angle according to the pressing force from the counterpart members 101 and 102 when a load is applied. In this case, the lengths of the cylindrical portions 211 and 212 are set so that the portions on the mating members 101 and 102 side of the cylindrical portions 211 and 212 are undeformed portions. Thereby, in the spring 200, the sliding with respect to the other members 101 and 102 of the cylindrical parts 211 and 212 can be prevented. As a result, no hysteresis occurs in the load characteristics of the spring 200.

  However, in the spring 200, as described above, it is necessary to secure the portions of the cylindrical portions 211, 212 on the side of the mating members 101, 102 as undeformed portions, so that the height of the cylindrical portions 211, 212 is reduced. There was a limit. In order to deal with a small installation space, a more suitable spring is desired.

  Therefore, an object of the present invention is to provide a spring that can be set to a low height, and thereby can correspond to a portion having a small installation space.

  As a result of intensive studies on the cylindrical part, the present inventor obtained knowledge that the end part can be prevented from being deformed by increasing the rigidity of the end part on the mating member side of the cylindrical part, Even when the height of the cylindrical portion is set low, it has been found that the end portion can be secured as an undeformed portion, and the present invention has been completed.

  The spring of the present invention includes a body portion having a hole, a cylindrical portion provided on at least one of the inner peripheral portion and the outer peripheral portion of the main body portion, and a boundary portion between the main body portion and the cylindrical portion. The cylindrical portion includes a contact portion that protrudes from the peripheral portion of the main body portion toward the mating member and abuts against the mating member, and the angle of the corner portion is applied from the mating member. It is elastically deformable so as to change according to the pressing force, and a reinforcing part that protrudes toward the inside or outside in the radial direction of the hole is formed at the abutting part of the cylindrical part. Yes.

  In the spring of the present invention, the corner portion can be elastically deformed when a load is applied. Therefore, by appropriately setting the distance between the corner portion of the cylindrical portion and the mating member, the mating member of the cylindrical portion when the load is applied. The deformation | transformation of the site | part of the vicinity can be prevented. Therefore, since the sliding of the cylindrical portion with respect to the mating member can be prevented, no friction is generated between the cylindrical portion and the mating member, and as a result, no hysteresis occurs in the load characteristics of the spring.

  Here, in the spring of the present invention, the abutting portion of the cylindrical portion has a reinforcing portion that protrudes toward the inside or the outside in the radial direction of the hole portion, and thus the same effect as that of the spring 200 of the comparative example. In addition, the following effects can be obtained.

  That is, in the spring of the present invention, the rigidity of the end of the cylindrical portion on the mating member side can be increased by the reinforcing portion provided at the contact portion of the cylindrical portion. Even when it is lowered, it is possible to reliably prevent the deformation of the end portion on the mating member side in the cylindrical portion when the corner portion is elastically deformed when a load is applied. Specifically, in the spring 200 of the comparative example, when the height of the cylindrical portion is lowered, the proportion of the undeformed portion with respect to the entire cylindrical portion decreases accordingly. In addition, in this case, since the rigidity of the cylindrical portion is reduced, it is easily affected by the elastic deformation of the corner portion when a load is applied, and the ratio of the non-deformed portion is substantially reduced. On the other hand, in the spring of the present invention, even when the height of the cylindrical portion is lowered, the rigidity of the end portion on the mating member side in the cylindrical portion is high. The end portion can be secured as an undeformed portion without being affected by deformation. Therefore, when the height of the cylindrical portion is lowered, the proportion of the undeformed portion relative to the entire cylindrical portion is not reduced as compared with the spring 200 of the comparative example.

  From the above, in the spring of the present invention, the height of the cylindrical portion can be set low, so that it is possible to cope with a small installation space.

  Various configurations can be used for the spring of the present invention. For example, a fixing hole for fixing to the mating member can be formed in the reinforcing portion. In this aspect, since sliding with respect to the mating member can be reliably prevented, occurrence of hysteresis due to sliding can be reliably prevented.

  According to the spring of the present invention, even when the height of the cylindrical portion is lowered, the rigidity of the end portion on the mating member side in the cylindrical portion is higher by the reinforcing portion. Can be secured. As a result, since the height of the cylindrical portion can be set low, it is possible to deal with a place where the installation space is small.

The structure of the spring which concerns on one Embodiment of this invention is represented, (A) is a perspective view, (B) is a sectional side view of the spring in the state arrange | positioned between members. 1 represents the operating state of the right side portion of the spring shown in FIG. 1, (A) is a side cross-sectional view of the spring before operation (dotted line) and during operation (solid line), and (B) is the first state during operation of the spring. It is an expanded side sectional view of a 1 corner and a 2nd corner. It is a graph showing the simulation result regarding the load characteristic at the time of changing the height of a 1st cylindrical part about the spring of the example of this invention. It is a graph showing the simulation result regarding the load characteristic at the time of changing the height of a 1st cylindrical part about the spring of a comparative example. (A), (B) is a figure for demonstrating the height of a 1st cylindrical part about the spring of this invention example and a comparative example. It is a graph showing the load characteristic of a disc spring. It is a graph showing the load characteristic of the actual disk spring which a hysteresis produces, (A) When the amplitude of a use range is a predetermined magnitude | size, (B) The graph when the amplitude of a use range is smaller than the case of (A) It is. The structure of the spring of a comparative example is represented, (A) is a perspective view, (B) is a sectional side view of the right part.

(1) Configuration of Embodiment (1-1) Overall Configuration Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 2A and 2B show the configuration of the spring 1, wherein FIG. 2A is a perspective view of the spring 1, and FIG. 2B is a side cross-sectional view of the right side portion of the spring 1 disposed between the first member 101 and the second member 102. It is.

  The spring 1 is made of, for example, spring steel or reinforcing material plastic. The spring 1 includes, for example, a main body 10 having a hole 10A formed at the center. The main body 10 extends, for example, in a direction crossing the direction of the pressing force from the first member 101 and the second member 102, and has a function as a disc spring. The main body 10 has, for example, a substantially conical shape that inclines as it goes downward. Thereby, the spring 1 becomes non-linear so that its load characteristic has a substantially flat region A, like the characteristic of the disc spring shown in FIG.

  The hole 10A has, for example, a circular shape. A first cylindrical portion 11 (cylindrical portion) that protrudes toward the first member 101 is provided on the inner peripheral portion of the main body portion 10. An upper end portion of the first tubular portion 11 (tubular portion) is a contact portion that contacts the first member 101. A second cylindrical portion 12 (cylindrical portion) that protrudes toward the second member 102 is provided on the outer peripheral portion of the main body portion 10. The lower end portion of the second cylindrical portion 12 is a contact portion that contacts the first member 102. The cylindrical parts 11 and 12 are cylindrical parts, for example.

  The contact portion of the first cylindrical portion 11 has a reinforcing portion 21 that protrudes inward in the radial direction of the hole portion 10A. A fixing hole 21 </ b> A for fixing to the first member 101 is formed in the reinforcing portion 21. The contact portion of the second cylindrical portion 12 has a reinforcing portion 22 that protrudes outward in the radial direction of the hole portion 10A. For example, a fixing hole 22 </ b> A for fixing to the second member 102 is formed in the reinforcing portion 22. The cylindrical portions 11 and 12 are fixed to the mating members 101 and 102 by providing screw means or the like in the fixing holes 21A and 22A.

  A first corner 13 is formed at the boundary between the main body 10 and the first cylindrical portion 11, and a second corner 14 is formed at the boundary between the main body 10 and the second cylindrical portion 12. Yes. The first corner portion 13 and the second corner portion 14 can be elastically deformed so as to change their angles according to the pressing force from the first member 101 and the second member 102.

  The spring 1 can be formed by bending each part by press molding. Moreover, each part can be formed by welding.

(1-2) Function of the cylindrical part The function of the cylindrical parts 11 and 12 at the time of applying a load will be described mainly with reference to FIG. FIG. 2 shows the operating state of one spring 1 installed between the first member 101 and the second member 102, and (A) shows the state before operation of the spring 1 (dotted line) and during operation (solid line). FIG. 4B is an enlarged cross-sectional view of the first corner portion 13 and the second corner portion 14 when the spring 1 operates. In FIG. 2, only the right side portion of one spring 1 is shown in the same manner as FIG. In FIG. 2, only the right side portion of the spring 1 is illustrated, and the reinforcing portions 21 and 22 are not illustrated.

  As shown by a dotted line in FIG. 2A, a downward load is applied from the first member 101 to the spring 1 disposed between the first member 101 and the second member 102. Then, as shown by the solid line in FIG. 2B, the spring 1 is bent and the first member 101 moves downward. The symbol d in the figure indicates the amount of deflection of the spring 1.

  The main body 10 extends in a direction that intersects the direction of the pressing force from the first member 101, and on the upper side of the spring 1, the first cylindrical portion 11 extends from the inner periphery of the main body 10 to the first member 101. Projecting toward and abutting there. The first corner portion 13 formed at the boundary between the main body portion 10 and the first cylindrical portion 11 is elastically deformed so that the angle α changes according to the pressing force from the first member 101 when a load is applied. be able to. In this case, since the first corner portion 13 is a portion formed at the boundary portion between the main body portion 10 and the first cylindrical portion 11 having the above positional relationship, such first corner portion 13 is It is possible to move to the inside (left side in the figure) of the inner periphery of the main body 10 while changing the angle α when applying a load.

  Since the first corner portion 13 can be elastically deformed when a load is applied in this way, the first cylindrical portion 11 is not deformed on the first member 101 side when a load is applied (from a point S in FIG. 2B). By appropriately setting the length of the first cylindrical portion 11 so as to have the upper side), deformation of the first member 101 side portion of the first cylindrical portion 11 can be prevented.

  On the other hand, on the lower side of the spring 1, the second cylindrical portion 11 protrudes from the inner peripheral portion of the main body portion 10 toward the second member 102 and is in contact therewith. In this case, the second corner portion 14 having a function similar to that of the first corner portion 13 changes the angle β in accordance with the pressing force from the second member 102 during elastic deformation by applying a load while the main body portion 10. It is possible to move to the outer side (right side in the figure) of the outer peripheral portion.

  Thus, since the second corner portion 14 can be elastically deformed when a load is applied, the second cylindrical portion 12 is not deformed on the second member 102 side when a load is applied (from a point T in FIG. 2B). By appropriately setting the length of the second cylindrical portion 12 so as to have the (lower side), deformation of the second member 102 side portion of the second cylindrical portion 12 can be prevented.

  As described above, since the spring 1 has the non-deformable portions in the cylindrical portions 11 and 12, it is possible to prevent the spring 1 and the counterpart member from sliding. As a result, in the load characteristics of the spring 1, the hysteresis that has been a problem with the disc spring does not occur.

(2) Operation | movement of embodiment Operation | movement of the spring 1 is demonstrated with reference to drawings. In the spring 1, when the first corner portion 13 is elastically deformed, the first tubular portion 11 has an undeformed portion on the first member 101 side (above the point S in FIG. 2B) and the second corner. When the portion 14 is elastically deformed, the second cylindrical portion 12 has an undeformed portion (below the point T in FIG. 2B) on the second member 102 side when a load is applied.

  Here, the contact portion of the first cylindrical portion 11 has the reinforcing portion 21 that protrudes inward in the radial direction of the hole portion 10A, and therefore the first member 101 side in the first cylindrical portion 11. The rigidity of the end of the can be increased. Since the contact portion of the second cylindrical portion 12 has the reinforcing portion 22 that protrudes toward the outside in the radial direction of the hole portion 10A, the end portion of the second cylindrical portion 12 on the second member 102 side. The rigidity of can be increased. As a result, even when the height of the cylindrical portions 11 and 12 is lowered, when the corner portions 13 and 14 are elastically deformed when a load is applied, the end portions of the counterpart members 101 and 102 in the cylindrical portions 11 and 12 are not affected. Deformation can be prevented.

  FIG. 3 shows the springs according to the present invention (specific examples of the spring 1) in which the height of the first cylindrical portion 11 shown in FIG. 5A is set to 2.8 mm, 1.0 mm, and 0.1 mm. It is a graph showing the simulation result regarding the load characteristic in an aspect. FIG. 4 shows a simulation regarding load characteristics in each aspect in which the height of the first cylindrical portion 211 shown in FIG. 5B is set to 2.8 mm, 1.0 mm, and 0.1 mm for the spring 200 of the comparative example. It is a graph showing a result. Note that the height of the first cylindrical portion 11 of the spring 1 of the present invention example is the height t of the linear portion of the first cylindrical portion 11 as shown in FIG. The height of the first cylindrical portion 211 was set to the height t of the linear portion of the first cylindrical portion 11 as shown in FIG.

  In the spring of the present invention, the first cylindrical portion 11 is provided with the reinforcing portion 21, the second cylindrical portion 12 is not provided with the reinforcing portion 22, and the reinforcing portion 21 is not formed with the fixing hole 21A (that is, The spring which closed the opening part of the 1st cylindrical part 11 was used. The spring of the present invention has the same configuration as the spring 200 of the comparative example, except that the reinforcing portion 21 is provided in the first cylindrical portion 11. That is, for the spring of the present invention and the spring 200 of the comparative example, the material, the plate thickness (= 0.4 mm), the height of the main body (= 3.17 mm), the inner diameter of the main body (= 13 mm, the first cylindrical shape The diameter of the opening of the part), the outer diameter of the main body (= 47 mm, the diameter of the opening of the second cylindrical part), and the height of the second cylindrical part (= 5.2 mm) are the same. .

  As can be seen from FIG. 4, in the comparative example, a spring with a height of 2.8 mm and a spring with a height of 1.0 mm obtained substantially the same load characteristics. In the load characteristic of the spring having a length of 0.1 mm, the generated load was significantly reduced and hysteresis was generated. The reason is considered that the rigidity of the first cylindrical portion is low in the spring of the comparative example, and the non-deformed portion is not secured. On the other hand, as can be seen from FIG. 3, in the spring of the example of the present invention, the first cylindrical portion has a height of 2.8 mm, a spring of 1.0 mm, and a spring of 0.1 mm. The load was almost the same, and hysteresis was not generated, and a substantially equivalent load characteristic was obtained. The reason is that, in the spring of the present invention, the rigidity of the end portion on the mating member side in the first cylindrical portion is higher by the reinforcing portion, so even if the height of the cylindrical portion is lowered, the end This is considered to be because the part was secured as an indeformable part.

  As described above, in the present embodiment, the reinforcing portions 21 and 22 provided at the contact portions of the tubular portions 11 and 12 have high rigidity at the ends of the tubular portions 11 and 12 on the mating member 101 and 102 side. Therefore, even when the heights of the cylindrical portions 11 and 12 are lowered, the end portions thereof can be ensured as undeformed portions. Therefore, since the height of the cylindrical parts 11 and 12 can be set low, it can respond to a location with a small installation space.

(3) Modifications As described above, the present invention has been described with reference to the above embodiment. However, the present invention is not limited to the above embodiment, and various modifications can be made. In the following modification, the same components as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The main body of the present invention can have, for example, a conical shape, an S shape, a step shape, or a flat shape that is inclined downward from the outer peripheral portion toward the inner peripheral portion. The cylindrical portion may be cylindrical, and the cross-sectional shape thereof may be a polygon, and the side cross-sectional shape thereof may be a curved shape. Moreover, a slit can be formed in the main body part 10 and the cylindrical parts 11 and 12 for weight reduction.

  In the above embodiment, the first cylindrical portion 11 is protruded toward the first member 101 and brought into contact therewith, and the second cylindrical portion 12 is brought into contact with the second member 102. The shape portion 11 may be protruded toward the second member 102 and brought into contact therewith, and the second tubular portion 12 may be protruded toward the first member 11 and brought into contact therewith. Further, the shapes of the first corner portion 13 and the second corner portion 14 are not limited to the illustrated shapes, and can be changed to various shapes such as a curved surface shape.

  Moreover, although the 1st cylindrical part 11 and the 2nd cylindrical part 12 were formed in the inner peripheral part and outer peripheral part of the main-body part 10, it is only in any one of the 1st cylindrical part 11 and the 2nd cylindrical part 12. It may be formed. Furthermore, instead of providing the fixing holes 21A and 22A and fixing them with screw means or the like, the reinforcing parts 21 and 22 may be fixed to the mating members 101 and 102 by welding. The protruding directions of the reinforcing parts 21 and 22 can be variously modified. For example, the reinforcing part 21 protrudes outward in the radial direction of the hole 10A, and the reinforcing part 22 is inward of the radial direction of the hole 10A. Can project toward.

  DESCRIPTION OF SYMBOLS 1 ... Spring, 10 ... Main-body part, 10A ... Hole part, 11 ... 1st cylindrical part (cylindrical part), 12 ... 2nd cylindrical part (cylindrical part), 13 ... 1st corner | angular part (corner part) , 14 ... second corner (corner), 21, 22 ... reinforcing part, 21A, 22A ... fixing hole, 101 ... first member, 102 ... second member

Claims (3)

A main body having a hole;
A cylindrical portion provided on at least one of the inner peripheral portion and the outer peripheral portion of the main body portion;
A corner portion formed at a boundary portion between the main body portion and the cylindrical portion;
The cylindrical portion includes a contact portion that protrudes from the peripheral portion of the main body portion toward the mating member and contacts therewith,
The corner portion is elastically deformable so that the angle changes according to the pressing force applied from the counterpart member,
The spring, wherein the abutting portion of the cylindrical portion is formed with a reinforcing portion that protrudes inward or outward in the radial direction of the hole.   The spring according to claim 1, wherein the contact portion does not slide relative to the mating member even when the pressing force changes.   The spring according to claim 1 or 2, wherein a fixing hole for fixing the reinforcing portion to the mating member is formed.

Images