JP2016017579A - Bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain excellent interference stability, excellent sealability of a bearing internal space, and high running stability by suppressing deformation of a slinger of a bearing device.SOLUTION: The shape of a cross-section including a shaft center, of a sealing member 50 is the L-shape along a first connection face 100Aa and a second connection face Ba, and the sealing member includes a slinger 51 disposed while kept into contact with at least the second connection face 100Ba, a first rubber member 52 disposed on the slinger 51, and a second rubber member 55 having a first lip portion 55a. An outer ring 20 has an annular groove portion 20B along an end face 20A. The first rubber member 52 has a projecting portion 52c extended toward the groove portion 20B. A labyrinth gap is formed between the projecting portion 52c and the groove portion 20B.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a bearing device that supports wheels of an automobile or the like. Specifically, the present invention relates to a structure of a sealing member that seals between an inner ring member and an outer ring.

  A wheel of an automobile or the like is generally supported by a wheel bearing device. FIG. 6 shows an example of a wheel bearing device 1001 that is generally used conventionally. The wheel bearing device 1001 includes an inner ring member 1100, an outer ring 1020, a plurality of rolling elements 1030, and a cage 1040. The inner ring member 1100 includes a hub shaft 1110 and an inner ring 1120. On the outer peripheral surface of the inner ring member 1100 and the inner peripheral surface of the outer ring 1020, raceway surfaces 1031 and 1032 on which the rolling elements 1030 roll are formed, and the raceway surfaces 1031 and 1032 are positioned so as to face each other. The plurality of rolling elements 1030 are arranged in a space A surrounded by the raceway surfaces 1031 and 1032 of the inner ring member 1100 and the outer ring 1020. The plurality of rolling elements 1030 are held by a cage 1040. One end of the hub shaft 1110 (left side in FIG. 6) has a flange-shaped attachment portion 1111 that extends radially outward. The attachment portion 1111 is attached to the wheel with a bolt or the like.

The wheel bearing device 1001 is normally used in an environment exposed to dust, rainwater, or the like. Therefore, it is necessary to take measures to prevent dust, rainwater, and the like from entering the inside of the wheel bearing device 1001 (the space A in which the rolling elements 1030 are arranged, which are configured between the inner ring member 1100 and the outer ring 1020). . In particular, in a cold region, an antifreezing agent such as calcium chloride (CaCl ₂ ) may be sprayed on the road surface. In this case, the water splashed from the road surface when the vehicle travels contains the salt content of the anti-freezing agent. Therefore, when this water enters the inside of the wheel bearing device 1001, rust is generated inside the wheel bearing device 1001. Cause. Therefore, in such an environment, in particular, a measure for preventing water and the like from entering the inside of the wheel bearing device 1001 is required.

  As a countermeasure against this, the wheel bearing device 1001 is provided with a sealing member 1050 that seals a gap between the hub shaft 1110 and the outer ring 1020. For example, a configuration in which a slinger made of SUS is provided as the sealing member 1050 is known (for example, Patent Document 1). Hereinafter, the configuration of the sealing member 1050 will be described.

  FIG. 7 is an enlarged view of a part of FIG. In the gap between the hub shaft 1110 and the outer ring 1020, as the sealing member 1050, an annular first sealing member (slinger 1051) and an annular second sealing member (core metal 1052 and rubber member 1053) are also provided. Is provided.

  The slinger 1051 is made of a metal such as SUS, for example. The slinger 1051 has a curved shape along a curved surface 1110A from the inner ring raceway surface 1031 to the mounting portion 1111 in the outer peripheral surface of the hub shaft 1110 in the gap between the hub shaft 1110 and the outer ring 1020. In addition, the slinger 1051 is not provided on the surface 1110B of the hub shaft 1110 that faces the mounting portion 1111 from the gap between the hub shaft 1110 and the outer ring 1020. The slinger 1051 has a shape having a bent portion 1051a that is bent in the axial direction toward the outer ring 1020.

  The metal core 1052 and the rubber member 1053 are fixed to the outer peripheral surface of the outer ring 1020 in a state where both are fixed integrally. Specifically, the metal core 1052 and the rubber member 1053 are fitted to the outer ring 1020 so as to contact the outer peripheral surface of the outer ring 1020 and the surface parallel to the radial direction facing the gap among the outer ring 1020. An axial lip 1053a that is in contact with a surface parallel to the radial direction of the slinger 1051 and a radial lip 1053b that is in contact with a surface parallel to the axial direction of the slinger 1051 are formed at the tip portion of the rubber member 1053 that extends in the direction of the hub shaft 1110. Is provided.

Special table 2013-534301 gazette

  By the way, as shown in FIG. 7, when the slinger 1051 has a curved shape, the slinger 1051 may be deformed in a direction to release the curved state. In other words, the slinger 1051 may be deformed so as to expand outward in the radial direction. If the slinger 1051 is deformed, the distance between the core bar 1052 and the slinger 1051 may change, which affects the stability of the interference margin of the axial lip 1053a and the radial lip 1053b. Since the crimping margin is not stable, the contact state between the axial lip 1053a or radial lip 1053b and the slinger 1051 becomes unstable. As a result, during operation of the bearing device, rotational torque due to friction generated between the axial lip 1053a or radial lip 1053b and the slinger 1051 may become unstable. Furthermore, since the fastening margin is not stable, the contact state between the axial lip 1053a or radial lip 1053b and the slinger 1051 becomes unstable, which may cause the sealing performance of the space A inside the bearing to become unstable.

  An object of the present invention is to obtain excellent sealability stability by suppressing the deformation of the slinger, and to obtain good sealing performance and good running stability of the bearing internal space.

  In a bearing device according to an embodiment of the present invention that solves the above problems, an inner ring member having a first raceway surface formed on an outer peripheral surface, and a second raceway surface that faces the first raceway surface is formed on an inner peripheral surface. An outer ring, a plurality of rolling elements that roll in a space formed between the first raceway surface and the second raceway surface, a cage that holds the plurality of rolling elements, the inner ring member, and the outer ring And a sealing member that seals a gap formed therebetween.

  The inner ring member includes an annular first outer peripheral surface on which the first raceway surface is formed, and an annular second outer peripheral surface continuous with the first outer peripheral surface. The first outer peripheral surface is an annular region including a first connection portion to which the first outer peripheral surface and the second outer peripheral surface are connected, and is substantially parallel to the radial direction and is more than the first connection portion. It has a first connecting surface radially inward. The second outer peripheral surface is an annular region including the first connection portion, and has a second connection surface substantially parallel to the axial direction.

  The outer ring includes an annular end surface facing the first connection surface, and an annular groove provided on the end surface and having a concentric axis with the end surface.

  The sealing member includes an annular first sealing member, an annular second sealing member, and an annular third sealing member. The first sealing member has an L-shaped cross section in the radial direction along the first connection surface and the second connection surface, and is provided in contact with at least the second connection surface. The second sealing member is in contact with the first sealing member and has an annular first portion along the first connection surface, and is in contact with the first sealing member and is annular in the second connection surface. And an annular projecting portion projecting from the first portion toward the groove portion of the outer ring. The projecting portion forms a labyrinth gap with the groove portion or comes into contact with a surface constituting the groove portion. A 3rd sealing member is attached to the internal peripheral surface of an outer ring | wheel, and has a 1st contact part which contacts the said 1st outer peripheral surface of the said inner ring member.

  According to the present invention, the inner ring member includes the first outer peripheral surface and the second outer peripheral surface which are adjacent to each other, and the first connection portion to which the first outer peripheral surface and the second outer peripheral surface are connected among the first outer peripheral surfaces. The annular region including the first connection surface is substantially parallel to the radial direction, and the annular region including the first connection portion of the second outer peripheral surface is the second connection surface substantially parallel to the axial direction. is there. Therefore, the 1st connection part which can fit a 1st sealing member will exist in the outer peripheral surface of an inner ring member.

  Since the 1st connection part which can fit a 1st sealing member in the outer peripheral surface of an inner ring member exists, a 1st sealing member follows the 1st connection surface and the 2nd connection surface along the 1st connection part. Can be provided in an annular shape. Therefore, the first sealing member can be designed to have a shape that is difficult to deform. Since the first sealing member is not easily deformed, the contact state between the third sealing member and the first contact portion is stabilized. That is, a stable interference can be obtained.

  Then, by obtaining a stable interference allowance, as a result, it is possible to realize good sealing performance and good running stability of the bearing internal space.

FIG. 1 is a cross-sectional view of the wheel bearing device according to the first embodiment. 2 is an enlarged cross-sectional view of the periphery of the sealing member in FIG. FIG. 3 is a cross-sectional view further enlarging the periphery of the sealing member in FIG. FIG. 4 is an enlarged cross-sectional view of the sealing member according to the second embodiment. FIG. 5 is an enlarged cross-sectional view of a sealing member according to another embodiment. FIG. 6 is a cross-sectional view of a conventional wheel bearing device. FIG. 7 is an enlarged cross-sectional view showing the periphery of the sealing member in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. For convenience of explanation, the drawings referred to in the following description show only the main members necessary for explaining the present invention in a simplified manner among the constituent members of the embodiment of the present invention. Therefore, the present invention can include arbitrary components not shown in the following drawings. In addition, the dimensions of the members in the following drawings do not faithfully represent actual dimensions, dimensional ratios of the members, or the like.

<Embodiment 1>
A wheel bearing device 1 according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows a wheel bearing device 1. FIG. 2 is an enlarged view of the vicinity of the sealing member 50 in FIG. The wheel bearing device 1 includes an inner ring member 100, an outer ring 20, a plurality of rolling elements 30, a cage 40, and a sealing member 50. The inner ring member 100 and the outer ring 20 are annular members having a shaft 130 as a central axis. As shown in FIG. 1, the wheel bearing device 1 has a flange formed outward in the axial direction, and is connected to a vehicle suspension through a member (not shown). The wheel bearing device 1 is covered with a lid member 21 in the axial direction.

  The inner ring member 100 includes a hub shaft 110 and an inner ring 120. The hub shaft 110 and the inner ring 120 are annular members having a shaft 130 as a central axis. As shown in FIG. 2, the outer peripheral surface of the inner ring member 100 includes a first outer peripheral surface 100A and a second outer peripheral surface 100B provided adjacent to the first outer peripheral surface 100A. Each of the first outer peripheral surface 100A and the second outer peripheral surface 100B is an annular member having the shaft 130 as a central axis. The first outer peripheral surface 100A and the second outer peripheral surface 100B are adjacent to each other through the first connection portion 100C. The annular first connection portion 100C is represented as a point connecting the first outer peripheral surface 100A and the second outer peripheral surface 100B in the cross-sectional view of FIG. The first connection portion 100C is an annular region having the shaft 130 as a central axis.

  As shown in FIG. 1, two first raceway surfaces 31 on which the rolling elements 30 roll are formed on the first outer peripheral surface 100A. One of the first raceway surfaces 31 is formed on the outer peripheral surface of the hub axle 110 and the other is formed on the outer peripheral surface of the inner ring 120. As illustrated in FIG. 2, the first connection surface 100Aa is a region including the first connection portion 100C in the first outer peripheral surface 100A, and is present radially inward from the first connection portion 100C. The first connection surface 100Aa is a surface parallel to the radial direction, that is, a surface perpendicular to the axial direction.

  The second outer peripheral surface 100 </ b> B is an outer peripheral surface of the hub shaft 110 in the inner ring member 100. The distance between the second outer peripheral surface 100B and the axis is greater than the distance between the first raceway surface 31 formed on the first outer peripheral surface 100A and the axis. The second connection surface 100Ba is a region including the first connection portion 100C in the second outer peripheral surface 100B. The second connection surface 100Ba is a surface parallel to the axial direction. Accordingly, the first connection surface 100Aa of the first outer peripheral surface 100A and the second connection surface 100Ba of the second outer peripheral surface 100B are connected at substantially right angles in the first connection portion 100C.

  As shown in FIG. 1, the hub shaft 110 has an attachment portion 111 for attaching the wheel bearing device 1 to a wheel. The attachment portion 111 has a flange shape extending outward in the radial direction. The attachment portion 111 is an annular member having the shaft 130 as a central axis. The attachment portion 111 is provided continuously to the second outer peripheral surface 100B on the opposite side of the second outer peripheral surface 110B from the first connection portion 100C. The attachment portion 111 is fixed to the wheel using a bolt or the like. In addition, the attaching part 111 does not need to be a cyclic | annular member provided continuously in the circumferential direction, for example, may be comprised by the some member provided at intervals in the circumferential direction.

  The outer ring 20 is provided so as to cover a part of the first outer peripheral surface 100 </ b> A of the inner ring member 100. As shown in FIG. 1, two second raceway surfaces 32 on which the rolling elements 30 roll are formed on the inner peripheral surface of the outer ring 20. Each of the second track surfaces 32 is positioned so as to face each of the first track surfaces 31.

  As shown in FIG. 2, the outer end surface 20 </ b> A in the axial direction of the outer ring 20 faces the first connection surface 100 </ b> Aa of the inner ring member 100. The end surface 20A is an annular region having the shaft 130 as a central axis.

  An annular groove 20B along the end surface 20A is formed on the end surface 20A. The groove 20B has a concentric axis (axis 130) with the end face 20A. That is, the central axis of the groove 20B is coaxial with the end face 20A. Thereby, the end face 20A is divided into two in the radial direction inner part and the outer part of the groove part 20B. From the viewpoint of securing the strength of the inner portion and the outer portion, it is preferable that the inner portion and the outer portion of the end face 20A have substantially the same radial width.

  As shown in FIG. 1, the end of the outer ring 20 opposite to the direction in which the mounting portion 111 of the inner ring member 100 exists, that is, the inner end in the axial direction is sealed with a disk-shaped lid member 21. Has been.

  The plurality of rolling elements 30 are arranged in a space A configured between the first raceway surface 31 and the second raceway surface 32. The plurality of rolling elements 30 are ball rolling elements. The plurality of rolling elements 30 are held by a cage 40. The rolling element 30 may be a roller rolling element in addition to a ball rolling element.

  The retainer 40 includes a plurality of pockets. And each of the some rolling element 30 is accommodated in each of a some pocket.

  FIG. 3 is an enlarged view of FIG. 2 showing the periphery of the sealing member 50. The sealing member 50 is provided in a gap formed between the inner ring member 100 and the outer ring 20, and seals the space A from the outside. The sealing member 50 includes a slinger (first sealing member) 51, a first rubber member (second sealing member) 52, and a third sealing member 53.

  The slinger 51 is a member provided so as to cover the outer peripheral surface around the first connecting portion 100 </ b> C of the inner ring member 100. The slinger 51 is an annular member having the shaft 130 as a central axis. The slinger 51 has an L shape along the first connection surface 100Aa and the second connection surface 100Ba in a radial cross section (a cross section including the shaft center of the bearing). The slinger 51 is provided in contact with the first connection surface 100Aa and the second connection surface 100Ba. The slinger 51 is made of, for example, SUS.

  The first rubber member 52 has a first portion 52a, a second portion 52b, and a protruding portion 52c. The first portion 52 a and the second portion 52 b are in contact with the slinger 51. The first portion 52a and the second portion 52b of the first rubber member 52 are fixed to the slinger 51 with an adhesive or the like. The first portion 52a, the second portion 52b, and the protruding portion 52c are integrally formed of rubber. Each of the first portion 52a, the second portion 52b, and the protruding portion 52c is an annular region having the shaft 130 as a central axis.

  The first portion 52 a is in contact with a portion of the slinger 51 along the first connection surface 100 </ b> Aa of the inner ring member 100.

  The second portion 52b is in contact with a portion of the slinger 51 along the second connection surface 100Ba of the inner ring member 100. Of the second portion 52b of the first rubber member 52, the end portion 52d that is outward in the axial direction covers the end surface in the direction in which the attachment portion 111 of the slinger 51 is present, that is, the end surface that is outward in the axial direction. And the end part 52d of the 2nd part 52b is provided so that it may slip into between the slinger 51 and the 2nd outer peripheral surface 100B. Since both the slinger 51 and the second outer peripheral surface 100B are made of metal, it is inevitable that a minute gap is formed between them when they are in direct contact. However, since the end portion 52d of the second portion 52b made of rubber is interposed between the slinger 51 and the second outer peripheral surface 100B, a gap between the slinger 51 and the second outer peripheral surface 100B is formed by the end portion 52d of the second portion 52b. Filling is performed, and moisture is prevented from entering the gap.

  The protruding portion 52c protrudes inward from the first portion 52a toward the groove portion 20B of the outer ring 20, that is, in the axial direction. A labyrinth gap is formed between the tip of the protrusion 52c and the groove 20B. Note that a labyrinth gap may be formed between the tip of the protrusion 52c and the surface 20Ba that is parallel to the axial direction among the surfaces constituting the groove 20B, and between the surface 20Bb that is perpendicular to the axial direction. A labyrinth gap may be formed. Since the protruding end of the protruding portion 52c and the groove portion 20B form a labyrinth gap, the entry of dust, water, muddy water, and the like from the outside into the bearing is suppressed.

  In addition, since the protrusion part 52c is shape | molded integrally with the 1st part 52a and the 2nd part 52b, by fixing the 1st part 52a and the 2nd part 52b to the slinger 51, the groove part 20B and the labyrinth are easily obtained. A structure can be formed.

  As shown in FIG. 2, the third sealing member 53 includes a cored bar 54 and a second rubber member 55. The core metal 54 and the second rubber member 55 are bonded and fixed together with, for example, an adhesive. The third sealing member 53 is an annular member having the shaft 130 as a central axis. The third sealing member 53 is fitted on the inner peripheral surface of the outer ring 20.

  The core metal 54 is formed of a metal plate such as SUS, for example.

  The second rubber member 55 includes a first lip portion 55 a that contacts the first outer peripheral surface 100 </ b> A of the inner shaft member 100 and a second lip portion 55 b that contacts the slinger 51. Since the first lip portion 55a is in contact with the first outer peripheral surface 100A in a state of being pressurized with respect to the first outer peripheral surface 100A, it is possible to suppress intrusion of dust, water, muddy water, and the like inside the bearing. Can do. Similarly, since the second lip portion 55b is in contact with the slinger 51 in a state of being pressurized with respect to the slinger 51, it is possible to prevent dust, water, muddy water, etc. from entering the bearing. it can.

  According to the first embodiment, the first connection surface 100Aa of the first outer peripheral surface 100A and the second connection surface 100Ba of the second outer peripheral surface 100B are connected at a substantially right angle at the first connection portion 100C, and are L-shaped. The slinger 51 is in contact with the first connection surface 100Aa and the second connection surface 100Ba. Therefore, the bent portion of the slinger 51 can be positioned on the first connection portion 100 </ b> C and fitted so as to be fixed to the inner ring member 100. As a result, the slinger 51 can be designed so that the slinger 51 has a shape that is not easily deformed. As a result, the first lip portion 55a and the second lip portion 55b are in contact with the first outer peripheral surface 100A and the slinger 51. Is stable. That is, a stable interference can be obtained.

  Then, by obtaining a stable interference allowance, as a result, it is possible to realize good sealing performance and good running stability of the bearing internal space.

<Embodiment 2>
Next, a bearing device according to Embodiment 2 of the present invention will be described. The bearing device according to the second embodiment has the same configuration as that of the first embodiment except that the sealing device 50A shown in FIG. 4 is provided.

  The sealing member 50 </ b> A includes a slinger 51 </ b> A, a first rubber member 52, and a third sealing member 53. The first rubber member 52 and the third sealing member 53 have the same configuration as that of the first embodiment.

  Similarly to the first embodiment, the slinger 51A is provided along the first connection portion 100C of the inner ring member 100, and the first connection surface 100Aa and the second connection surface 100Ba in the radial cross section (the cross section including the shaft center of the bearing). It has an L shape along. The slinger 51 is an annular member having the shaft 130 as a central axis. The slinger 51A is provided in contact with the second connection surface 100Ba, but is disposed at a distance from the first connection surface 100Aa.

  The slinger 51A may vary in the thickness (see d in FIG. 4) depending on the product. That is, there may be a small individual difference in the plate thickness at the manufacturing stage. When the thickness d of the slinger is larger than the design value by Δd, the distance between the surface of the slinger and the outer ring when the slinger contacts the first connection surface 100Aa of the first outer peripheral surface 100A (see FIG. 4 corresponds to a distance indicated by a in FIG. 4), which is smaller than the design value by Δd, and there is a possibility that the interference as designed may not be obtained. However, by providing a gap between the slinger 51A and the first connection surface 100Aa as in the second embodiment and adjusting the distance between the surface of the slinger 51A and the outer ring 20 to the design value a, the slinger 51A Regardless of the plate thickness d, the interference as designed can be obtained.

<Other embodiments>
In the first embodiment, it has been described that the tip of the protruding portion 52c of the first rubber member 52 and the groove portion 20B form a labyrinth gap, but the tip of the protruding portion and the groove portion come into contact with each other. In addition, the structure may be such that water, muddy water, and the like can be prevented from entering. For example, in FIG. 5, the sealing member 50B includes a first rubber member 52B. The protrusion 52Bc of the first rubber member 52B is in contact with the surface 20Bb that constitutes the groove 20B.

  As mentioned above, embodiment mentioned above is only the illustration for implementing this invention. Therefore, the present invention is not limited to the above-described embodiment, and can be implemented by appropriately modifying the above-described embodiment without departing from the spirit thereof.

  The present invention is useful for a bearing device that supports a wheel of an automobile or the like. Specifically, the structure of the sealing member that seals between the inner ring member and the outer ring is useful.

DESCRIPTION OF SYMBOLS 1 Wheel bearing apparatus 100 Inner ring member 100A 1st outer peripheral surface 100Aa 1st connection surface 100B 2nd outer peripheral surface 100Ba 2nd connection surface 100C 1st connection part 110 Hub shaft 120 Inner ring 20 Outer ring 20A End surface 20B Groove part 30 Rolling body 31 1st Raceway surface 32 Second raceway surface 40 Cage 50 Sealing member 51 Slinger (first sealing member)
52 1st rubber member (2nd sealing member)
52a 1st part 52b 2nd part 52c Protrusion part 53 3rd sealing member 55a 1st lip | rip part (1st contact part)
55b Second lip portion (second contact portion)
A space

Claims (2)

An inner ring member having a first raceway surface formed on the outer peripheral surface;
An outer ring having a second raceway surface facing the first raceway surface formed on an inner peripheral surface;
A plurality of rolling elements that roll in a space formed between the first raceway surface and the second raceway surface;
A cage for holding the plurality of rolling elements;
A sealing member for sealing a gap formed between the inner ring member and the outer ring;
With
The inner ring member is
An annular first outer peripheral surface on which the first raceway surface is formed;
An annular second outer peripheral surface adjacent to the first outer peripheral surface;
Including
The first outer peripheral surface is
An annular region including a first connection portion to which the first outer peripheral surface and the second outer peripheral surface are connected, and is substantially parallel to the radial direction and is radially inward of the first connection portion. Connection surface,
Have
The second outer peripheral surface is
An annular region including the first connection portion, a second connection surface substantially parallel to the axial direction;
Have
The outer ring is
An annular end surface facing the first connection surface;
An annular groove provided on the end face and having a concentric axis with the end face;
Have
The sealing member is
An annular first sealing member having a radial cross-sectional shape that is L-shaped along the first connection surface and the second connection surface, and provided in contact with at least the second connection surface;
An annular first portion in contact with the first sealing member and along the first connection surface; an annular second portion in contact with the first sealing member and along the second connection surface; An annular second projecting member provided with an annular projecting portion projecting from one portion toward the groove portion of the outer ring,
An annular third sealing member attached to an inner peripheral surface of the outer ring and having a first contact portion that contacts the first outer peripheral surface of the inner ring member;
Have
The protrusion is a bearing device in which a labyrinth gap is formed between the protrusion and the groove, or a surface that forms the groove. The bearing device according to claim 1,
The third sealing member further includes
An annular second contact portion that contacts a surface along the first outer peripheral surface of the first sealing member;
Including a bearing device.

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