JP2009074589A - Sealing device - Google Patents

Abstract

To provide a sealing device having a small torque, excellent sealing performance, and a small axial dimension.
An outer diameter of the fixing portion 65 of the pack seal slinger 52 on the outer peripheral surface of the end portion on the opposite side to the axial flange portion 66 side increases toward the opposite side to the axial flange portion 66 side. The inclined outer peripheral surface portion 98 is formed so as to be small. The elastic member 51 of the pack seal is fixed to the radial extending portion 61 of the core metal member 50, and the core metal fixing portion side extending from the base 53 and sliding on the flange portion 66 of the slinger 52 The lip 54 and the slinger fixing portion side lip 55 and the inclined surface sliding contact lip 56 extending from the base portion 53 in the substantially radial direction and sliding on the inclined outer peripheral surface portion 98 are configured.
[Selection] Figure 2

Description

  The present invention relates to a sealing device.

  Conventionally, as a sealing device, there is one described in JP 2003-314698 A (Patent Document 1).

  This sealing device includes a cored bar member, an elastic member fixed to the cored bar member, and a slinger having an L-shaped cross section. The slinger includes an axially extending portion and a radially extending portion, and the elastic member slides on the radial lip that always slides on the axially extending portion and on the radially extending portion. A first axial lip; and a second axial lip that is positioned radially inward of the first axial lip and slides on the radially extending portion.

In such a background, in the hub unit, it is desired to significantly reduce the torque of the sealing device that seals the rolling elements to the outside. In addition, in the conventional sealing device, it is difficult to avoid that the radial lip is so worn that the sealing performance deteriorates with time. For this reason, a sealing device in which the sealing performance is unlikely to deteriorate over a long period of time is desired.
JP 2003-314698 A (FIG. 1)

  Accordingly, an object of the present invention is to provide a sealing device that has a small torque and is unlikely to deteriorate in sealing performance over a long period of time.

In order to solve the above problems, the sealing device of the present invention is:
Seal member having a cylindrical fixing part, a cored bar member having a radially extending part extending from the fixing part in a substantially radial direction of the fixing part, and an elastic member fixed to the cored bar member When,
A slinger having a substantially cylindrical fixing portion and a flange portion extending substantially in the radial direction from one axial end portion of the fixing portion;
The other end portion in the axial direction of the fixed portion of the slinger has an inclined outer peripheral surface portion whose outer diameter decreases as going to the other end in the axial direction,
The elastic member is
A base fixed to the radially extending portion of the core member;
One or more flange sliding lips extending from the base and sliding on the flange of the slinger;
It is characterized by comprising an inclined surface sliding contact lip extending in a substantially radial direction from the base portion and sliding on the inclined outer peripheral surface portion of the slinger.

  In addition, the “the elastic member includes a base portion fixed to the radially extending portion of the cored bar member, and one or more that extend from the base portion and slide on the flange portion of the slinger. The flange sliding contact lip and the inclined surface sliding lip that extends from the base and slides to the end surface of the other axial end of the fixed portion of the slinger are The flange sliding contact lip on the fixed part side of the direction slinger refers to the elastic member in a state where it is not worn.

  That is, the present invention includes the case where the flange sliding contact lip located on the most radial slinger fixing portion side does not come into contact with the slinger fixing portion in any state. When the flange sliding contact lip located on the fixed part side of the flange wears out after being used for a certain period of time, a part of the slung sliding contact lip contacts the peripheral surface of the fixed part of the slinger and functions as a radial lip. Are included in the present invention.

  The inventor is a so-called pack-sealing type sealing device having a cored bar member, an elastic member, and a slinger having an L-shaped cross section, which has two radial lips and one axial lip. The magnitude of the torque caused by the lip contact load was investigated. As a result, the ratio of the torque due to the contact load of the two radial lips reached about 80%, and it was found that most of the torque was due to the contact load of the radial seal.

  According to the present invention, the elastic member has a base, a flange sliding contact lip that is an axial lip that is in sliding contact with the flange portion of the slinger extending in a substantially radial direction, and a slope having a normal line having an axial component and a radial component. Since it consists of the inclined surface sliding contact lip which is slidably contacted with an outer peripheral surface part, a radial contact load can be made only into the radial component in the contact load of an inclined surface sliding contact lip.

  Therefore, the radial contact load can be remarkably reduced in the non-wearing state (hereinafter simply referred to as non-wearing state) of the flange sliding contact lip on the most fixed portion side of the slinger, and the non-wearing state (or the most radial slinger) Torque can be drastically reduced in any state when the flange sliding contact lip located on the fixed portion side is not in contact with the slinger fixed portion. Therefore, the fuel consumption of an automobile or the like having this sealing device can be reduced.

  Further, according to the present invention, since the sloping surface sliding contact lip extends substantially in the radial direction from the base portion and slides on the sloping outer peripheral surface portion of the slinger, the sealing device is provided with a slinger fixing portion. When the rolling element arrangement space of the rolling bearing device in which the rolling elements located on the side opposite to the flange portion side in the axial direction are sealed, the temperature in the rolling element arrangement space increases as the temperature of the rolling bearing device rises. When the atmospheric pressure rises, the inclined surface sliding contact lip is pressed in the axial direction against the inclined outer peripheral surface portion, and an airtight seal is realized between the inclined surface sliding contact lip and the inclined outer peripheral surface portion. Therefore, when the atmospheric pressure in the rolling element arrangement space rises, it is possible to reliably prevent the air and lubricant in the rolling element arrangement space from leaking to the outside.

  Further, according to the present invention, when the atmospheric pressure in the rolling element arrangement space rises, it is possible to suppress the leakage of air and lubricant in the rolling element arrangement space to the outside, so after use of the rolling bearing device, When the temperature of the rolling bearing device decreases, the atmospheric pressure in the rolling element arrangement space is unlikely to become a negative pressure. Therefore, after using the rolling bearing device, it is possible to suppress external foreign matter from being drawn into the bearing device, and reliably prevent external foreign matter from entering the bearing device.

  Further, according to the present invention, the inclined surface sliding contact lip can prevent, for example, the air and lubricant in the rolling bearing device from leaking out of the rolling bearing when the temperature of the rolling bearing device rises, and When the temperature of the rolling bearing device returns from high temperature to room temperature, it is possible to suppress external foreign matter from being drawn into the bearing device, so that the sealing performance can be improved.

  Further, according to the present invention, since the inclined outer peripheral surface portion has a shape that the outer diameter decreases as it goes to the other end in the axial direction, in order to contact the inclined outer peripheral surface portion, as in the present invention, The inclined surface sliding lip may be extended substantially in the radial direction. Therefore, when the lip that is in sliding contact with the other end portion of the slinger fixing portion extends in a direction inclined with respect to the radial direction from the position that does not overlap the slinger fixing portion in the radial direction toward the slinger fixing portion. As compared with the above, the axial width can be reduced, and the sealing device can be made compact.

  Further, in one embodiment, in the axial cross section, the surface of the inclined surface sliding contact lip on the flange portion side in the axial direction and the inclined outer peripheral surface portion are the inclined surface sliding contact lip and the inclined outer peripheral surface. An acute angle is formed at the contact point with the surface portion.

  According to the embodiment, in the axial cross section, the surface of the inclined surface sliding contact lip on the flange portion side in the axial direction and the inclined outer peripheral surface portion are the inclined surface sliding contact lip and the inclined outer peripheral surface. Since an acute angle is formed at the contact point with the surface portion, the contact width of the inclined surface sliding contact lip with the inclined outer peripheral surface portion can be reduced, and wear can be suppressed.

  In one embodiment, the flange sliding contact lip extends from the base portion to the fixing portion side and the axial flange portion side of the radial metal core member, and slides on the flange portion. The core metal fixing part side lip and the fixing part side of the radial slinger of the core metal fixing part side lip are positioned in the radial direction with respect to the core metal fixing part side lip. And a slinger fixing portion side lip that slides on the flange portion.

  In one embodiment, the slinger fixing portion side lip includes a first portion extending from the base portion to the fixing portion side of the radial slinger and to the axial flange portion side, and the first portion. A second portion that extends from the distal end of the axial flange portion side to the fixed portion side of the radial metal core member and the axial flange portion side and slides on the flange portion. In a state before the elastic member is incorporated into the slinger, the surface of the first portion in the radial direction on the fixed portion side of the slinger is a concave surface, while the radial direction of the second portion is in the radial direction. The surface of the slinger on the fixed part side is a conical surface or a convex surface.

  In this specification, the conical surface is included in the concave surface, but not included in the convex surface.

  In the sealing device having the conventional configuration, the inventor has a large deformation of the radially inner axial lip portion on the core metal member side, and stress concentration occurs in this portion. As a result, the lifetime of the sealing device was shortened.

  According to the embodiment, since the surface of the first portion in the radial direction on the fixing portion side of the slinger is a concave surface in a state before the elastic member is assembled into the slinger, Unlike the case where the surface of the slinger fixing portion side in the radial direction of the portion is a convex surface, in the initial state of the assembled state, the slinger fixing portion side lip is made non-contact with the slinger fixing portion. In addition, it is not necessary to intensively and excessively deform a portion of the first portion of the first portion of the slinger fixing portion side lip, and by deforming the entire first portion substantially uniformly in its extending direction, the slinger The fixed part side lip can be made non-contact with the fixed part of the slinger. Accordingly, since a part of the first portion is not subjected to local and excessive stress, the durability of the slinger fixing portion side lip can be remarkably improved and the life of the sealing device can be extended. .

  Further, according to the above embodiment, the surface of the second portion of the radial slinger on the fixed portion side is a conical surface or a convex surface in the state before the assembly, so that the slinger of the second portion Compared with the case where the surface on the fixing part side is concave, the contact surface pressure between the slinger fixing part side lip and the flange part of the slinger can be reduced, and the wear of the slinger fixing part side lip is suppressed. Can do. Therefore, since the time until the slinger fixing part side lip contacts the fixing part of the slinger can be increased, the surface of the second part on the fixing part side of the slinger is a concave surface. The state in which the torque is extremely small can be maintained for a long time.

  In one embodiment, in the non-wearing state after the elastic member is incorporated in the slinger, the slinger fixing part side lip is spaced in the radial direction with respect to the fixing part of the slinger. The elastic member is worn after the elastic member is incorporated in the slinger, and the slinger fixing part side lip wears against the flange part due to wear of the slinger fixing part side lip. A part of the slinger fixing portion side lip facing the fixing portion of the slinger is slid on the fixing portion of the slinger in a state in which is reduced by a predetermined force or more.

  According to the above-described embodiment, the wear of the second portion of the slinger fixing portion side lip reduces the pressing force against the flange portion of the slinger fixing portion side lip by a predetermined force or more, and the slinger fixing portion side lip Part of the part of the slinger that faces the fixed part comes into contact with the fixed part of the slinger and slides on the fixed part. The part of the slinger fixing part side lip can be a radial lip, and foreign matter such as muddy water can be prevented from entering the rolling element arrangement space of the hub unit from the outside.

  Moreover, in one Embodiment, the surface of the fixing part side of the said slinger of the said 2nd part is connected smoothly.

  The term “smoothly connected” means that in the axial section of the sealing device, the surface of the second portion of the slinger fixing portion side is from one end to the other end (the one end and the other end can be differentiated right or left) ) Is in a differentiable state.

  According to the embodiment, since the surface of the second portion on the fixed portion side of the slinger is smoothly connected, the stress caused by the deformation of the slinger fixed portion side lip at the time of assembling is reduced. It can be distributed and distributed almost equally throughout. In addition, the slinger fixing part side lip can be easily deformed to the fixing part side of the core metal member in the radial direction when assembled, and the core metal fixing part side lip and the slinger fixing part side lip are in a non-wearing state. A predetermined clearance can be easily and accurately generated between the slinger fixing part side lip and the slinger fixing part.

  Moreover, in one embodiment, in the state before the assembly, in the axial cross section, the curvature of the surface of the first portion on the fixed portion side of the slinger increases as the flange portion extends in the axial direction. It is getting bigger.

  According to the phrase “increasing toward the flange portion in the axial direction”, the surface of the first portion of the fixed portion side of the slinger in the axial section is on the radial flange portion side. It is assumed that a case where a portion where the curvature is partially constant is included is included. For this reason, for example, in the above wording, in the axial cross section, the surface of the first portion slinger fixed portion side is smoothly connected to the conical surface located on the base side and the conical surface, and the rotating ellipse The case where it consists of the concave surface which consists of a surface is included.

  According to the embodiment, in the state before the assembly, in the axial cross section, the curvature of the surface of the first portion on the fixed portion side of the slinger is closer to the axial flange portion side. Since it is large, the stress caused by the deformation of the slinger fixing part side lip at the time of assembly can be distributed and evenly distributed throughout the first part, and the slinger fixing part side lip is fixed to the fixing part. When the non-contact state is realized, it is possible to reliably prevent local stress concentration from occurring in the first portion.

  According to the sealing device of the present invention, at least the flange sliding lip on the most slinger fixed part side in the radial direction can dramatically reduce the radial contact load in a non-wearing and non-wearing state, and the torque can be drastically reduced. can do. Therefore, the fuel consumption of an automobile or the like having this sealing device can be reduced.

  Further, according to the sealing device of the present invention, the sealing device includes the inclined surface sliding lip that extends from the base and slides on the inclined outer peripheral surface portion of the slinger. When the rolling element arrangement space of the rolling bearing device in which the rolling elements located on the side opposite to the part side are sealed, the pressure in the rolling element arrangement space increases as the temperature of the rolling bearing device increases. In this case, the inclined surface sliding lip is pressed against the inclined outer peripheral surface portion of the slinger, and an airtight seal is realized between the inclined surface sliding contact lip and the inclined outer peripheral surface portion. Therefore, when the atmospheric pressure in the rolling element arrangement space rises, it is possible to reliably prevent the air and lubricant in the rolling element arrangement space from leaking to the outside.

  Further, according to the sealing device of the present invention, when the atmospheric pressure in the rolling element arrangement space rises, it is possible to suppress the leakage of air and lubricant in the rolling element arrangement space to the outside. Later, when the temperature of the rolling bearing device decreases, the atmospheric pressure in the rolling element arrangement space is unlikely to become negative pressure, and after the use of the rolling bearing device, it is possible to prevent external foreign matter from being drawn into the bearing device. Thus, it is possible to reliably prevent external foreign matter from entering the bearing device.

  In addition, according to the sealing device of the present invention, since it has the inclined surface sliding contact lip capable of suppressing external foreign matter from being drawn into the bearing device, excellent sealing performance can be maintained even if there is no radial lip. . Also, if the pressing force against the flange portion of the flange sliding contact lip closest to the fixed portion of the flange portion is reduced by a predetermined force or more, a part of the flange sliding contact lip closest to the slinger fixed portion side is fixed to the slinger fixing portion. Even in this case, in that case, a part of the flange sliding contact lip can play the role of a radial lip, so that excellent sealing performance can be maintained. Therefore, according to the sealing device of the present invention, a part of the flange sliding contact lip closest to the slinger fixing portion side becomes the slinger fixing portion in a state where the pressing force against the flange portion of the flange sliding contact lip is reduced by a predetermined force or more. The sealing performance can be made excellent over a long period of time regardless of whether the flange slidable contact lip closest to the slinger is not in contact with the fixed portion of the slinger.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a sectional view in the axial direction of a hub unit including sealing devices 8 and 9 according to an embodiment of the present invention.

  The hub unit includes an inner shaft 2, an outer ring 3, an inner ring 4, a plurality of first balls 5 as a plurality of rolling elements, a plurality of second balls 6 as a plurality of rolling elements, and an embodiment of the present invention. The 1st sealing device 8 and the 2nd sealing device 9 of one Embodiment of this invention are provided.

  The inner shaft 2 has a disc-shaped brake disk mounting flange 10 extending in the radial direction to which the brake disk 11 is mounted at one end in the axial direction. A plurality of bolt through holes are formed on a concentric circle centered on the approximate center of the brake disk mounting flange 10. With the brake disc 11 in contact with the brake disc mounting flange 10 and further with the wheel member 13 in contact with the brake disc 11, the end surface of the wheel member 13 opposite to the brake disc 11 side, The disk mounting flange 10 is fixed with a plurality of bolts 15.

  An inner ring 4 is externally fitted and fixed to the other axial end of the inner shaft 2. In the axial direction, an angular first raceway groove 16 is formed between the inner ring 4 and the brake disk mounting flange 10 in the inner shaft 2, while the outer circumferential surface of the inner ring 4 is angular. A second track groove 17 of the mold is formed.

  The outer ring 3 is arranged on the other end side of the brake disc mounting flange 10 in the inner shaft 2 so as to face the inner shaft 2 in the radial direction. The outer ring 3 has a vehicle body side mounting flange 14 that extends in the radial direction on the other end side in the axial direction. A plurality of bolt through holes for inserting bolts for attaching the vehicle body side mounting flange 14 to the vehicle body side (knuckle) are formed in the disk-shaped vehicle body side mounting flange 14. The outer ring 3 has an angular third track groove 26 and a fourth track groove 27 that are axially spaced from each other on the inner peripheral surface of the outer ring 3, and the angular third track groove 26 is an angular type. It is located on the one end side with respect to the fourth track groove 27.

  The first ball 5 is spaced apart from the first raceway groove 16 of the inner shaft 2 and the third raceway groove 26 of the outer ring 3 by a predetermined distance in the circumferential direction while being held by the cage 18. Are arranged. The second ball 6 is held at a predetermined interval in the circumferential direction while being held by the cage 19 between the second raceway groove 17 of the inner ring 4 and the fourth raceway groove 27 of the outer ring 3. Several are arranged.

  The first sealing device 8 is disposed in the vicinity of the opening on the one end side (the brake disc mounting flange 10 side) in the axial direction between the inner shaft 2 and the outer ring 3. The first sealing device 8 seals the opening on the one end side of the space between the inner shaft 2 and the outer ring 3. On the other hand, the second sealing device 9 is disposed between the inner ring 4 and the outer ring 3 in the vicinity of the opening on the other end side in the axial direction (the side opposite to the brake disk mounting flange 10 side). The second sealing device 9 seals the opening on the other end side of the space between the inner ring 4 and the outer ring 3.

  FIG. 2 is an axial cross-sectional view of the first sealing device 8 after the seal member 48 is incorporated into the slinger 52.

  The second sealing device 9 has the same structure as the first sealing device 8. The description of the second sealing device 9 is omitted from the description of the first sealing device 8. Further, in FIG. 2, it is assumed that the flange sliding contact lips (the core metal fixing portion side lip 54 and the slinger fixing portion side lip 55) described below are assumed to receive no force from the flange portion 66 of the slinger 52. The position is illustrated.

  As shown in FIG. 2, the first sealing device (hereinafter simply referred to as a sealing device) 8 includes a sealing member 48 and a slinger 52, and the sealing member 48 includes a cored bar member 50 and an elastic member 51. .

  The core metal member 50 is formed in an annular shape. The core bar member 50 has an L-shaped cross section. The cored bar member 50 includes a cylindrical fixing part 60 and a radially extending part 61. The fixing part 60 is fitted and fixed to the inner peripheral surface of the outer ring 3 (see FIG. 1, not shown in FIG. 2). The radially extending portion 61 extends substantially inward in the radial direction from the other end side in the axial direction on the inner peripheral surface of the fixed portion 60 (the left side in the drawing of FIG. 2).

  The slinger 52 is formed in an annular shape. The slinger 52 has an L-shaped cross section. The slinger 52 has a cylindrical fixing portion 65 and a flange portion 66 connected to the fixing portion 65. The end portion of the fixing portion 65 of the slinger 52 opposite to the axial flange portion side has an inclined outer peripheral surface portion 98 whose outer diameter decreases toward the opposite side of the axial flange portion side. Yes. The inner peripheral surface 68 of the fixing portion 65 is fixed by being fitted on the outer peripheral surface of the inner shaft 2. In the second sealing device 9, needless to say, the member to which the slinger is fixed is the inner ring 4. The flange portion 66 extends from the end portion on the outer side in the axial direction (the right side in the drawing) of the outer peripheral surface of the fixed portion 65 to the outer side in the substantially radial direction. The flange portion 66 is located outward in the axial direction of the hub unit with respect to the radially extending portion 61 of the cored bar member 50. Most of the flange portion 66 excluding a part on the inner side in the radial direction is opposed to the radially extending portion 61 in the axial direction through a gap.

  The elastic member 51 is formed in an annular shape. The elastic member 51 covers the entire inner peripheral surface of the fixing portion 60 of the cored bar member 50 and the entire end surface on the outer side in the axial direction of the radially extending portion 61 connected to the inner peripheral surface of the fixing portion 60. As described above, the cored bar member 50 is fixed. The elastic member 51 includes a base 53, a core metal fixing portion side lip 54 as a flange sliding contact lip, a slinger fixing portion side lip 55 as a flange sliding contact lip, and an inclined surface sliding contact lip 56. Specifically, the elastic member 51 is made of a rubber material. As the rubber material, nitrile rubber, hydrogenated nitrile rubber, acrylic rubber, silicon rubber, or fluorine rubber is preferably used.

  The base portion 53 is disposed along the inner peripheral surface of the fixed portion 60 of the cored bar member 50 and the end surface on the outer side in the axial direction of the radially extending portion 61. The base portion 53 is fixed to the inner peripheral surface of the fixed portion 60 and the outer end surface of the radially extending portion 61.

  Each of the metal core fixing part side lip 54 and the slinger fixing part side lip 55 extends from the base part 53 and slides on the flange part 66 of the slinger 52. The core metal fixing part side lip 54 extends from the base part 53 to the fixing part side of the radial core metal member 51 and outward in the axial direction, and slides on the flange part 66. The slinger fixing part side lip 55 is located on the fixing part 65 side of the slinger 52 in the radial direction of the cored bar fixing part side lip 54 and is spaced from the cored bar fixing part side lip 54 in the radial direction. It slides on the part 66.

  The slinger fixing portion side lip 55 has a first portion 57, a second portion 58, and a bent portion 59. The first portion 57 extends from the base 53 to the radially inner shaft 2 side and the axially outward side, while the second portion 58 is radially outwardly 3 side and axially outward. Extends to the side. The bent portion 59 is located between the first portion 57 and the second portion 58 and connects the first portion 57 and the second portion 58. The bent portion 59 has a substantially V-shaped cross section. In the axial cross section, in the slinger fixing portion side lip 55, the tip of the bent portion 59 having a substantially V-shaped cross section is located at the innermost in the radial direction. Although not shown, in a state before the elastic member 51 of the seal member 48 is incorporated in the slinger 52, that is, in a state where the elastic member 51 is not receiving a force from the slinger 52, The inner surface 90 is concave, while the radially inner surface 91 of the second portion 58 is a conical surface.

  Although not shown, in a state where the elastic member 51 is not receiving a force from the slinger 52, the curvature of the inner surface 90 in the radial direction of the first portion 57 in the axial section is the axial outward direction ( Increasing toward the flange 66 side). Specifically, in a state where the elastic member 51 does not receive a force from the slinger 52, the radially inner surface 90 of the first portion 57 in the axial cross section is a substantially cone located on the base 53 side. A surface portion and a portion composed of a part of a substantially spheroidal surface that is smoothly connected to the conical surface portion and has a curvature that increases toward the outside in the axial direction (flange portion 66 side) ( The curvature is larger than the conical surface so that it is inclined inward in the radial direction).

  On the other hand, the radially inner surface 91 of the second portion 58 is differentiable from one end to the other end in the axial section in a state where the elastic member 51 is not receiving force from the slinger 52. The surface 91 is smoothly connected.

  The inclined surface sliding contact lip 56 extends in a substantially radial direction from the radially innermost side of the base portion 53 to the inclined outer peripheral surface portion 98. The outer corner in the axial direction (the corner on the side of the slung portion 66 in the axial direction) at the radially inner tip of the inclined surface sliding lip 98 is in contact with the inclined outer peripheral surface 98.

  In the axial cross section of the slinger 52, the axially outer surface of the inclined surface sliding lip 56 (the inclined surface sliding lip 56 of the inclined surface sliding contact lip 56 at the contact point 94 between the inclined surface sliding lip 56 and the inclined outer peripheral surface portion 98. The angle θ formed by the axial flange surface 66 side 93 and the inclined outer peripheral surface 98 is an acute angle.

  The flange portion of the slinger 52 is formed by the relative rotation about the central axis of the seal member 48 and the slinger 52 during assembly of the second portion 58 of the metal core fixing portion side lip 54 and the slinger fixing portion side lip 55. It slides on the part 66. The inclined surface sliding lip 56 slides on the inclined outer peripheral surface 98 of the slinger 52 by relative rotation around the central axis of the seal member 48 and the slinger 52 during assembly. Further, in the assembled state and the non-wearing state after use, the bent portion 59 which is a part of the slinger fixing portion side lip 55 is spaced from the fixing portion 65 of the slinger 52 in the radial direction. Is located.

  In the sealing device of this embodiment, even when the tightening force against the flange portion 66 of the slinger fixing portion side lip 55 is reduced due to wear of the second portion 58 of the slinger fixing portion side lip 55, the bent portion 59 does not move the slinger. It is located at a radial interval with respect to the fixed portion 65 of 52. In addition, the bending part may come into contact with the fixing part of the slinger and slide on the fixing part in a state where the pressing force against the flange part of the slinger fixing part side lip is reduced by a predetermined value or more. That is, the bending portion plays a role as a radial lip (meaning that it is a contact radial lip that is not a labyrinth seal) in a state where the pressing force on the flange portion of the slinger fixing portion side lip has decreased by a predetermined value or more. Also good.

  The space formed by the core metal fixing portion side lip 54, the slinger fixing portion side lip 55, and the flange portion 66 of the slinger 52, the slinger fixing portion side lip 55, the inclined surface sliding lip 56, and the slinger 52 An appropriate amount of grease is sealed or applied as a lubricant in the space formed by. With this grease, the sliding portion between the cored bar fixing portion side lip 54 and the slinger 52, the sliding portion between the slinger fixing portion side lip 55 and the slinger 52, and the sliding between the inclined surface sliding lip 56 and the slinger 52 The part is lubricated.

  FIG. 3 is a diagram showing the ratio of the contact load of each lip to the total contact load in the comparative sealing device in one experimental example. Here, the experiment whose result is shown in FIG. 3 was carried out without using a lubricant (such as grease). FIG. 5 is a sectional view in the axial direction of a comparative sealing device used in the experiment whose results are shown in FIG.

  As shown in FIG. 5, this comparative sealing device is a so-called pack seal type sealing device having a cored bar member 250, an elastic member 251 and a slinger 252 having an L-shaped cross section. This comparative sealing device has one axial lip 271 and two radial lips (a main lip 272 and an auxiliary lip 273). FIG. 5 shows the position of the elastic member 251 at the assembly position of the elastic member 251 when it is assumed that the elastic member 251 receives no force from the slinger 252 in the sealing device of the comparative example.

  As shown in FIG. 3, in the comparative sealing device, the contact load ratio with respect to the total contact load of the radial lip (total of two) reaches 80%, while the contact load ratio with respect to the total contact load of the axial lip is It is about 20%. From this, if the contact load of the radial lip can be reduced, the torque can be greatly reduced.

  According to the sealing device of the above-described embodiment, the elastic member 51 includes the base 53, the flange sliding contact lips 54 and 55 that are axial lips that are in sliding contact with the flange 66 of the slinger 52 extending substantially in the radial direction, and the axial component. And the inclined surface sliding contact lip 56 that is in sliding contact with the inclined outer peripheral surface portion 98 having a normal line having a radial component, the radial contact load can be limited to only the radial component in the contact load of the inclined surface sliding contact lip 56. it can. Therefore, the radial contact load can be remarkably reduced, and the torque can be drastically reduced. Therefore, the fuel consumption of an automobile or the like having this sealing device can be reduced.

  Further, according to the sealing device of the above embodiment, the sealing device has the inclined surface sliding contact lip 56 that extends from the base portion 53 in the substantially radial direction and slides on the inclined outer peripheral surface portion 98 of the slinger 52. When the ball arrangement space of the rolling bearing device in which the balls 5 and 6 located on the opposite side of the flange portion 66 in the axial direction of the fixed portion 65 of the slinger 52 are sealed, the temperature of the rolling bearing device is When the atmospheric pressure in the ball arrangement space increases with the rise, the inclined surface sliding contact lip 56 is pressed outward in the axial direction by the inclined outer peripheral surface portion 98, and the inclined surface sliding contact lip 56 and the inclined outer peripheral surface portion 98 are pressed. Airtight sealing is realized between the two. Therefore, when the atmospheric pressure in the ball arrangement space rises, it is possible to reliably prevent the air and lubricant (grease, etc.) in the ball arrangement space from leaking outside.

  Further, according to the sealing device of the above embodiment, when the air pressure in the ball arrangement space rises, it is possible to prevent the air and lubricant in the ball arrangement space from leaking to the outside, so that after use of the rolling bearing device When the temperature of the rolling bearing device decreases, the atmospheric pressure in the ball arrangement space is unlikely to become a negative pressure. Therefore, after using the rolling bearing device, it is possible to suppress external foreign matter from being drawn into the bearing device, and reliably prevent external foreign matter from entering the bearing device.

  Further, according to the sealing device of the above-described embodiment, when the temperature of the rolling bearing device rises, for example, when the temperature of the rolling bearing device rises, the air and the lubricant in the rolling bearing device leak out of the rolling bearing. In addition, when the temperature of the rolling bearing device returns from high temperature to room temperature, it is possible to suppress external foreign matter from being drawn into the bearing device, so that the sealing performance can be improved.

  Further, according to the sealing device of the above embodiment, the inclined outer peripheral surface portion 98 has a shape in which the outer diameter decreases as it goes to the end in the axial direction (the end opposite to the flange portion 66 side in the axial direction). Therefore, in order to make contact with the inclined outer peripheral surface portion 98, the inclined surface sliding contact lip 56 may be extended substantially in the radial direction as in this embodiment. Therefore, the direction in which the lip slidably contacting the end of the slinger fixing portion opposite to the flange portion side is inclined with respect to the radial direction from the position where it does not overlap the slinger fixing portion in the radial direction. Compared with the case where it extends, the width | variety of an axial direction can be made small and a sealing device can be made compact.

  Further, according to the sealing device of the above embodiment, in the axial section of the slinger 52, the surface 93 on the flange side in the axial direction of the inclined surface sliding contact lip 56 and the inclined outer peripheral surface portion 98 are inclined surface sliding. Since an acute angle is formed at the contact point between the contact lip 56 and the inclined outer peripheral surface portion 98, the contact width of the inclined surface sliding contact lip 56 with respect to the inclined outer peripheral surface portion 98 can be reduced, and wear can be suppressed.

  Further, according to the hub unit shown in FIG. 1, since the sealing device of the above embodiment is provided, the torque of the sealing device can be reduced during operation, and the fuel consumption of the vehicle having the hub unit can be reduced. Can do.

  In the sealing device of the above embodiment, there are two flange sliding lips extending from the base portion 53 and sliding on the flange portion 66 of the slinger 52. There may be only one or three or more flange sliding lips extending from the base and sliding on the flange portion of the slinger.

  Further, in the above hub unit, the sealing device of the present invention is disposed in the vicinity of the openings on both sides in the axial direction of the ball arrangement space (lubricant enclosure space). It may be arranged only in the vicinity of the opening on one side in the axial direction of the moving body (not a ball, but may be a roller, or both may be a ball) arrangement space (lubricant enclosure space) .

  FIG. 4 is an enlarged sectional view of the periphery of the sealing device 99 of the water pump provided with the sealing device 99 of the present invention.

  This water pump has a pump shaft 100, a mechanical seal 101, a pump housing 102, an outer ring 105, and a sealing device 99 of the present invention. The pump housing 102 has a drain hole 107 that penetrates the pump housing 102. The outer ring 105 is fitted and fixed to the inner peripheral surface of the pump housing 102.

  The pump shaft 100, the outer ring 105, and the sealing device 99 form part of a water pump bearing of the water pump. That is, although not shown, on the side indicated by the arrow a in FIG. 4 on the inner peripheral surface of the outer ring 105, a deep groove type raceway groove and a cylindrical raceway surface are provided from the side closer to the sealing device 99 at an axial interval. 4 is formed on the side of the outer peripheral surface of the pump shaft 100 as indicated by the arrow a in FIG. 4 from the side closer to the sealing device 99 at an axial interval and a deep groove type track groove and a cylindrical track. A surface is formed.

  Between the raceway groove of the outer ring 105 and the raceway groove of the pump shaft 100, a plurality of balls as rolling elements held in a cage are arranged at predetermined intervals in the circumferential direction. Yes. Further, between the cylindrical raceway surface of the outer ring 105 and the cylindrical raceway surface of the pump shaft 100, cylindrical rollers as rolling elements held by a cage are spaced apart at a predetermined interval in the circumferential direction. Are arranged.

  The cored bar portion 150 of the sealing device 99 is fitted and fixed to the inner peripheral surface of the outer ring 105, while the slinger 152 of the sealing device 99 is fitted and fixed to the outer peripheral surface of the pump shaft 100. Yes. The sealing device 99 seals the opening on the mechanical seal 101 side between the outer ring 105 and the pump shaft 100. In this manner, the cooling water in the pump chamber leaking from the mechanical seal 101 in the direction indicated by the arrow b is prevented from entering the water pump bearing.

  The leaked cooling water in the pump chamber is surely discharged to the outside in the direction indicated by the arrow c through the drain hole 107 formed in the pump housing 102. In FIG. 4, 111 indicates a rubber sleeve of the mechanical seal 101, and 110 indicates a coil spring of the mechanical seal 101.

  If the sealing device 99 of the present invention is installed in the water pump as in the water pump shown in FIG. 4, the torque of the water pump bearing in the water pump can be reduced, and the fuel consumption of an automobile or the like having the water pump can be reduced.

  Further, according to this water pump, the elastic member 151 of the sealing device 99 includes the inclined surface sliding contact lip 156 that is in sliding contact with the inclined outer peripheral surface portion 198 of the fixing portion 165 of the slinger 152. When the temperature of the space fluctuates from a low temperature to a high temperature, air and lubricant can be prevented from leaking out of the rolling element arrangement space, while the temperature of the rolling element arrangement space fluctuates from a high temperature to a low temperature. In addition, it is difficult for negative pressure to be generated in the rolling element arrangement space, and it is possible to prevent foreign matters from entering the rolling element arrangement space due to this.

  In the above embodiment, the sealing device of the present invention is set to a hub unit or a water pump. However, the sealing device of the present invention may be set between the rotor and the stator in the motor, and in this case, the operating cost of the motor can be reduced. The sealing device of the present invention may be disposed between the inner ring and the outer ring of a simple rolling bearing. The sealing device of the present invention includes a first member having an inner peripheral surface and a second member having an outer peripheral surface, and the first member and the second member are included in the first member. The device can be installed in any machine as long as it is a device facing the radial direction of the peripheral surface. And while being able to reduce the operating cost of the machine which installed the sealing device of this invention, the performance of the sealing device can be made excellent in the machine.

It is sectional drawing of the axial direction of a hub unit provided with the sealing device of one Embodiment of this invention. It is sectional drawing of the axial direction of the 1st sealing device after a sealing member is integrated in a slinger. It is a figure which shows the ratio of the contact load of each lip with respect to the total contact load in the sealing device of a comparative product in one experimental example. It is an expanded sectional view of the above-mentioned sealing device periphery of a water pump provided with the sealing device of the present invention. It is sectional drawing of the axial direction of the sealing device of a comparative product.

Explanation of symbols

48 sealing member 50,150 cored bar member 51,151 elastic member 52,152 slinger 53 base 54 cored bar fixing part side lip 55 slinger fixing part side lip 56,156 inclined surface sliding contact lip 60 fixing part 61 radially extending part 65,165 Fixed portion 66 Flange portion 93 An axially outer surface of the inclined surface sliding contact lip 94 A contact point between the inclined surface sliding contact lip and the inclined outer peripheral surface portion 98,198 Inclined outer peripheral surface portion θ In the axial section of the slinger The angle formed between the outer surface of the inclined surface sliding contact lip in the axial direction and the inclined outer peripheral surface portion at the contact point between the inclined surface sliding contact lip and the inclined outer peripheral surface portion.

Claims (2)

Seal member having a cylindrical fixing part, a cored bar member having a radially extending part extending from the fixing part in a substantially radial direction of the fixing part, and an elastic member fixed to the cored bar member When,
A slinger having a substantially cylindrical fixing portion and a flange portion extending substantially in the radial direction from one axial end portion of the fixing portion;
The other end portion in the axial direction of the fixed portion of the slinger has an inclined outer peripheral surface portion whose outer diameter decreases as going to the other end in the axial direction,
The elastic member is
A base fixed to the radially extending portion of the core member;
One or more flange sliding lips extending from the base and sliding on the flange of the slinger;
A sealing device comprising: an inclined surface sliding contact lip extending in a substantially radial direction from the base portion and sliding on the inclined outer peripheral surface portion of the slinger. The sealing device according to claim 1,
In the cross section in the axial direction, the surface of the inclined surface sliding contact lip on the flange portion side in the axial direction and the inclined outer peripheral surface portion are at a contact point between the inclined surface sliding contact lip and the inclined outer peripheral surface portion. A sealing device having an acute angle.

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