JP2019074102A - Bearing device for wheel - Google Patents

Abstract

To provide a bearing device for a wheel having high muddy water resistance by stably holding grease inside of a bearing while preventing influence by centrifugal force generated by rotation of an outer member.SOLUTION: In a bearing device 1 for a wheel including an outer member, an inner member and a seal member 6, the seal member 6 includes a seal plate 7 having a plurality of seal lips 9, and a slinger 10 composed of a slinger fitting portion 10a fitted to the inner member, a standing plate member 10b, and a supporting portion 10c. The seal member 6 includes a side lip 9b, and a bent lip 9e disposed at an outer diameter side with respect to the side lip 9b and bent at an intermediate portion, a bent part of the bent lip 9 is kept into contact with or close to the standing plate portion 10b, the tip portion of the bent lip 9e is kept into contact with or close to the supporting portion 10c, and grease G is sealed in an annular space S1 having a substantially triangular cross-section formed by the slinger 10 and the bent lip 9e.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a bearing device for a wheel. More particularly, the present invention relates to a bearing device for a wheel including a seal member having high mud resistance without being affected by a centrifugal force generated by rotation of an outer member.

  2. Description of the Related Art Conventionally, there has been known a wheel bearing device which rotatably supports a wheel in a suspension system of a car or the like. In the wheel bearing device, the inward member is rotatably supported by the outward member via the rolling elements. In the wheel bearing device, the amount of grease filled in the internal space between the inward member and the outward member decreases, and foreign matter such as rain water, muddy water, dust and the like or differential oil enters, whereby the rolling element and inward member The raceway surface of the outer member is damaged and the bearing life is shortened. For this reason, in the bearing apparatus for a wheel, a seal member for preventing leakage of grease filled in the internal space between the outer member and the inner member and preventing entry of foreign matter and differential oil from the outside is provided outward. It is provided between the member and the inward member.

  Among such wheel bearing devices, in order to obtain a longer bearing life, there are some in which a plurality of seal mechanisms are provided in the seal member to improve the sealability. In some seal members, a labyrinth structure is configured by a plurality of seal lips. With such a configuration, the sealing member can be prevented from entering the foreign matter by the labyrinth structure, and the sealing performance can be improved. For example, it is as described in Patent Document 1.

  The bearing sealing device for a wheel bearing described in Patent Document 1 comprises an annular seal plate (slinger) and an elastic seal member. The seal plate is a metal member having an L-shaped cross section which includes a cylindrical portion fitted to the outer periphery of the inward member and a standing plate portion rising from an end of the cylindrical portion. The elastic seal member comprises an annular core metal and an elastic body integrally fixed to the core metal. The cored bar is a member having an L-shaped cross section facing the seal plate, having a cylindrical portion fitted to the inner peripheral surface of the outward member, and a standing plate portion which falls from the end of the cylindrical portion. The elastic body is arranged side by side in the radial direction of the core metal with two side lips each having its tip end in contact with the standing plate portion of the seal plate, and two radials arranged in the axial direction and in contact with or close to the outer peripheral surface of the seal plate. Have a lip. This bearing sealing device aims to improve the anti-muddy water performance without increasing the weight. In addition, a ring-shaped spring member (garter spring) is provided on the seal lip in which the side lip and the radial lip are integrated. As a result, the contact of the radial lip with the cylindrical portion of the seal plate is intensified, and the effect of preventing the muddy water intrusion by the radial lip is further enhanced. Such a configuration is applied to a large vehicle such as a truck used in an area where the use condition is severe (the muddy water easily intrudes into the inside of the wheel bearing) in order to improve the mud water resistance.

JP, 2009-115273, A

  For example, in the case of the bearing sealing device of the bearing for wheels described in Patent Document 1, the elastic seal member fitted to the outer member (outer ring) is rotated. As a result, each seal lip of the elastic seal member is affected by the centrifugal force and the interference is reduced, leading to a decrease in mud water resistance. Conventionally, a garter spring has been added to the seal lip as described above as a countermeasure, but in such a case, the rotational torque of the bearing is increased due to the increase in the contact pressure of the seal lip to the seal plate (slinger). A fever may occur. Therefore, there is a demand for a configuration of a seal lip having mud resistance and a configuration for stably holding grease inside the bearing so as to prevent the inflow of mud water and the like without using a garter spring or the like.

  The present invention has been made in view of the above circumstances, and by preventing the influence of the centrifugal force generated by the rotation of the outer member, the grease can be stably held inside the bearing to achieve high resistance. An object of the present invention is to provide a wheel bearing device having a mud fluid.

The first invention is
An outer member having a plurality of rows of outer raceways formed on the inner periphery,
An inner member having a plurality of rows of inner rolling surfaces opposed to the plurality of rows of outer rolling surfaces formed on an outer periphery thereof;
Double-row rolling elements rotatably accommodated between rolling surfaces of the outer member and the inner member;
And a seal member for sealing an internal space formed between the outer member and the inner member.
The seal member is a cored bar fitted to the outer member, and an annular seal plate formed of a plurality of seal lips integrally formed on the cored core and being elastic members;
A cylindrical fitting portion disposed opposite to the seal plate and fitted to the inward member, a rising plate portion extending radially outward from the fitting portion, and a bearing inward side from the rising plate portion A slinger comprising a support extending axially towards the
The seal lip includes a side lip extending toward the standing plate portion of the slinger, and an outer diameter side lip provided on an outer diameter side of the side lip and having a middle portion bent.
The bent portion of the outer diameter side lip contacts or approaches the upright plate portion and the tip of the outer diameter side lip contacts or approaches the support portion,
Grease is sealed in a space constituted by the slinger and the outer diameter side lip.

The second invention is
The plurality of seal lips are such that only one of the side lip and one of the outer diameter side lip contacts or approaches the standing plate portion of the slinger.

The third invention is
The cored bar has a seal plate fitting portion fitted to the outward member,
The support portion of the slinger is opposed to the seal plate fitting portion in the radial direction via a predetermined gap to constitute a labyrinth seal.

  The effects of the present invention are as follows.

  In the wheel bearing device according to the first aspect of the present invention, by providing the outer diameter side lip, even if the centrifugal force is generated by the rotation of the outer member, the distal end portion of the outer diameter side lip is surely cylindrical by the centrifugal force. Grease is sealed in an annular space which is in contact with or in close proximity to the part and which is constituted by the slinger and the outer diameter side lip. As a result, the outer diameter side lip not only seals in contact with or in close proximity to the slinger at two places, but grease is held in the annular space between them, so muddy water etc. can be prevented from flowing from the outside of the bearing into the inside of the bearing Thus, it is possible to provide a wheel bearing device comprising a seal member having high mud resistance.

  In the wheel bearing device according to the second aspect of the present invention, the plurality of seal lips are in contact with or close to the side plate of the slinger and only one outer lip and one outer lip. Thereby, the sealability is maintained by the side lip having one contact or proximity point and the outer diameter side lip having two contact or proximity points. As a result, the number of side lips in the seal member can be reduced, and the height in the cross-sectional radial direction of the seal lip can be suppressed, whereby a compact seal member can be configured.

  In the bearing apparatus for a wheel according to the third aspect of the present invention, the support portion of the slinger is opposed to the seal plate fitting portion in the radial direction via a predetermined gap to configure a labyrinth seal. Thereby, mud fluid can be suppressed from flowing into the inside of the bearing from the outside of the bearing, and it is possible to provide a bearing apparatus for a wheel including a seal member having high mud resistance.

Sectional drawing which shows the whole structure in 1st embodiment of the bearing apparatus for wheels which concerns on this invention. The expanded end view which shows the structure of the outer side sealing member in 1st embodiment of the bearing apparatus for wheels which concerns on this invention. The enlarged end view which shows the outer side sealing member shown in FIG. The expanded end view which shows the structure of the outer side sealing member in 2nd embodiment of the bearing apparatus for wheels which concerns on this invention. The enlarged end view which shows the outer side sealing member shown in FIG. Sectional drawing which shows the whole structure in 3rd embodiment of the bearing apparatus for wheels which concerns on this invention. The enlarged end view which shows the structure of the outer side sealing member of the conventional bearing apparatus for wheels.

  First, a wheel bearing device 1 which is a first embodiment of a wheel bearing device according to the present invention will be described. FIG. 1 is a cross-sectional view showing the wheel bearing device 1. 2 and 3 are cross-sectional views showing a partial structure of the wheel bearing device 1.

  The wheel bearing device 1 rotatably supports a wheel. The wheel bearing device 1 includes an outer member 2, an inner member 3, and two rolling element rows 4. In the present specification, the "inner side" refers to the vehicle side of the wheel bearing device 1 when attached to the vehicle body, and the "outer side" refers to the wheel bearing device 1 when attached to the vehicle body. Represents the wheel side.

  The outer member 2 constitutes an outer ring portion of a rolling bearing structure. A fitting portion 2 a is formed on the inner periphery of the inner side end portion of the outer member 2. In addition, a fitting portion 2 b is formed on the inner periphery of the outer side end portion of the outer member 2. Furthermore, two outer rolling surfaces 2c and 2d are formed between the fitting portion 2a and the fitting portion 2b. The outer raceway surface 2c faces an inner raceway surface 3c described later. The outer raceway 2d faces an inner raceway 3d described later. The outer member 2 is fixed by the flange 26 in a state of being fitted to the inside of the hub wheel 25. Then, it is rotated by the drive shaft 27 together with the flange 26.

  The inward member 3 constitutes an inner ring portion of the rolling bearing structure. The inward member 3 is configured by abutting the first inward member 31 and the second inward member 32 to each other.

  A fitting portion 3 a is formed on the outer periphery of the inner side end portion of the first inward member 31. Furthermore, an inner raceway surface 3c is formed on the outer periphery adjacent to the fitting portion 3a. The inner raceway surface 3 c faces the above-described outer raceway surface 2 c in a state where the first inward member 31 is disposed inside the outer member 2.

  A fitting portion 3 b is formed on the outer periphery of the outer side end of the second inward member 32. Furthermore, an inner raceway surface 3 d is formed on a portion adjacent to the fitting portion 3 b in the outer periphery of the outer side end portion of the second inward member 32. The inner raceway surface 3 d faces the above-described outer raceway surface 2 d in a state in which the second inner member 32 is disposed inside the outer member 2.

  The rolling element row 4 constitutes a rolling portion of a rolling bearing structure. The rolling element row 4 on the inner side is composed of a plurality of tapered rollers 41 and one cage 42. Similarly, the rolling element row 4 on the outer side is also configured by a plurality of tapered rollers 41 and one cage 42.

  The tapered rollers 41 are respectively arranged circularly at equal intervals by the cage 42. The tapered rollers 41 constituting the rolling element row 4 on the inner side are between the outer rolling surface 2 c of the outer member 2 and the inner rolling surface 3 c of the inner member 3 (first inner member 31). Of the outer rolling surface 2d of the outer member 2 and the inner member 3 (the second inner member 32) It is rotatably interposed between the inner raceway surfaces 3d.

  By the way, the wheel bearing device 1 has a pair of seals for sealing the annular space S formed between the outer member 2 and the inner member 3 (the first inner member 31 and the second inner member 32). A member 6 is provided.

  The inner side seal member 6 is configured of one slinger 10 and one seal plate 7. Similarly, the outer side seal member 6 is also constituted by one slinger 10 and one seal plate 7.

In the wheel bearing device 1, a double row tapered roller bearing is mainly configured by an outer member 2, an inner member 3 and two rolling element rows 4 (conical rollers 41 and the like). In the present embodiment, a double row conical roller bearing is illustrated as the wheel bearing device 1, but the invention is not limited to this, and a double row angular ball bearing or the like may be used.
In addition, since the inner side sealing member 6 and the outer side sealing member 6 are the same structures, below, only the outer side sealing member 6 is demonstrated.

  As shown in FIGS. 2 and 3, the outer seal member 6 closes the gap formed between the fitting portion 2 b of the outer member 2 and the fitting portion 3 b of the inner member 3. . The outer seal member 6 is a so-called pack seal that includes a substantially cylindrical seal plate 7 and a slinger 10 that is a substantially cylindrical metal ring. The slinger 10 which comprises the outer side sealing member 6 is externally fitted by the fitting part 3b of the inward member 3 (2nd inward member 32).

  As shown in FIG. 2, the seal plate 7 is composed of a core 8 and a seal lip 9 which is an elastic member integrally formed on the core 8 by, for example, vulcanization bonding.

  The cored bar 8 of the inner side sealing member 6 is a metal member press-fit into the fitting portion 2b which is the inner periphery of the outer side end portion of the outward member 2, and, for example, cold rolled steel plate (JIS standard SPCC etc.). The core metal 8 is formed by bending an outer edge portion of a ring-shaped steel plate by press working and having a substantially L shape in an axial cross-sectional view. Thereby, the cored bar 8 is an annular ring which is a cylindrical seal plate fitting portion 8a fitted to the fitting portion 2b of the outer member 2 and an inner diameter portion extending radially inward from the outer side end thereof. And the lip support 8b. The tip of the seal plate fitting portion 8a of the cored bar 8 is formed thin, and the seal lip 9 wraps around and is integrally joined so as to cover the outer surface of the tip, forming a so-called half metal structure There is. Thereby, the air tightness can be enhanced to protect the inside of the bearing. The seal plate 7 has a seal plate fitting portion 8 a fitted in the fitting portion 2 b of the outer member 2 so as to be integrated with the outer member 2.

  The seal lip 9 is made of, for example, NBR (acrylonitrile-butadiene rubber) as a material, HNBR (hydrogenated acrylonitrile butadiene rubber) excellent in heat resistance, EPDM (ethylene propylene rubber), ACM excellent in heat resistance and chemical resistance. Polyacrylic rubber), FKM (fluorinated rubber), or synthetic rubber such as silicone rubber can be used.

The seal lip 9 is formed in an annular shape, and includes a base 9a covering the inner peripheral surface of the core metal 8, a pair of side lips 9b and 9c extending obliquely outward from the base 9a, and the side lip A radial lip 9d that extends inward to the bearing on the inner diameter side of the lip 9c, and an outer diameter side lip that is formed on the outer diameter side relative to the side lip 9b and extends axially outward (outer side) It has a certain bending lip 9e. The bending lip 9 e is bent radially outward (toward the support portion 10 c of the slinger 10) at its midway portion. Specifically, the bent lip 9e extends from the base 9a in an axially outward and radially outward inclined manner (extends toward the upstanding plate portion 10b of the slinger 10) and an end of the side lip 9f. And an outer radial lip 9g that is inclined radially outward from a portion (a portion in contact with or in proximity to the slinger 10) and extends inward (inner side) of the bearing. The outer radial lip 9g may be bent toward the support portion 10c of the slinger 10 as long as the middle portion (the boundary between the side lip 9f and the outer radial lip 9g) is bent as in the present embodiment. The configuration is not limited to bending, and may be curved.

  That is, the base 9a, the pair of side lips 9b, 9c, the radial lip 9d, and the bending lip 9e (the side lip 9f, the outer radial lip 9g) are integrally formed on one side of the lip support 8b by, for example, vulcanization bonding. Are formed. The seal lip 9 is disposed to face the slinger 10. The pair of side lips 9b and 9c and the bending lip 9e are seal lips that prevent foreign matter such as mud water from entering the bearing from the outside. The radial lip 9d is a seal lip mainly for preventing the bearing grease from leaking from the inside of the bearing. Further, in the present embodiment, a plurality of side lips are provided, but one or more than two may be provided.

  The slinger 10 is a metal ring composed of a steel plate equivalent to the core metal 8 of the seal plate 7. In the slinger 10, an annular steel plate is bent by press processing, and is formed in a rectangular shape in an axial sectional view. Thus, the slinger 10 is cylindrical and has a slinger fitting portion 10a fitted in the fitting portion 3b of the inward member 3 and an extension extending radially outward from an end of the slinger fitting portion 10a. An annular standing plate portion 10b, and a cylindrical support portion 10c axially extending from the end of the standing plate portion 10b toward the bearing inward to support the tip of the outer radial lip 9g It is configured. In the slinger 10, the slinger fitting portion 10 a is fitted and fixed to the fitting portion 3 b of the inward member 3. At this time, the slinger 10 is disposed such that the inner side surface of the upright plate portion 10 b faces the lip support portion 8 b of the seal plate 7.

  Then, the side lips 9b and 9c and the side lip 9f of the seal lip 9 contact or approach the upright plate portion 10b via a predetermined oil film, and the radial lip 9d is predetermined near the inner side end of the slinger fitting portion 10a. Contact or proximity through the oil film. Furthermore, the outer radial lip 9g of the bending lip 9e is in contact with or close to the vicinity of the inner end of the inner diameter surface of the support portion 10c via a predetermined oil film. That is, the slinger 10 is a contact portion between the side lips 9b, 9c, 9f and the radial lips 9d, 9g, and more specifically, the standing plate portion 10b is a contact portion with which the side lips 9b, 9c, 9f contact. The slinger fitting portion 10a is a contact portion with which the radial lip 9d contacts, and the support portion 10c is a contact portion with which the outer radial lip 9g contacts.

  The base 9a of the seal lip 9 is slightly inclined toward the tip of the seal plate fitting portion 8a of the core metal 8, and the support 10c of the slinger 10 has a slight radial clearance at this end. The labyrinth seal 11 is configured to face each other. Thereby, rain water, muddy water, dust, etc. can be suppressed from flowing from the outside of the bearing into the inside of the bearing from the outside.

  In the wheel bearing device 1 configured as described above, the inner member 3 is rotatably supported by the outer member 2 via the inner row of rolling elements 4 and the outer row of rolling elements 4. Further, in the wheel bearing device 1, the gap between the inner fitting portion 2a of the outer member 2 and the inner fitting portion 3a of the inner member 3 is closed with the inner seal member 6, A gap between the fitting portion 2 b on the outer side of the member 2 and the fitting portion 3 b on the outer side is closed by the outer seal member 6. As a result, in the wheel bearing device 1, the outer member 2 is rotated by the drive shaft 27 together with the flange 26 and the hub wheel 25 while preventing leakage of grease from the inside and intrusion of rain water and dust from the outside.

In the wheel bearing device 1, grease G is formed in an annular space S1 formed by the outer radial lip 9g of the bending lip 9e and the corner portion formed by connecting the standing plate portion 10b and the support portion 10c in the slinger 10. It is enclosed.
Although the grease G shown in FIG. 2 is tightly sealed in the annular space S1, it is not particularly limited, and may be sparsely sealed.

  Thus, in the present embodiment, the outer seal member 6 is a slinger 10 fitted to the seal plate 7 fitted to the fitting portion 2 b of the outer member 2 and the fitting portion 3 b to the inner member 3. And are arranged to face each other to constitute a pack seal. The outer radial lip 9g of the bending lip 9e of the seal plate 7 is configured to be in contact with or close to the support portion 10c of the slinger 10, and the side lip 9f of the bending lip 9e is configured to be in contact with or close to the upstanding plate portion 10b of the slinger 10. ing. For example, when the outer member 2 rotates, the seal plate 7 fitted to the outer member 2 also rotates. As a result, in the conventional seal member as shown in FIG. 7, the side lip of the seal member is affected by the centrifugal force at the time of rotation of the outer member 2 and a force is exerted to pull it radially outward. The reduction in the margin resulted in a decrease in mud resistance. On the other hand, in the seal member 6 according to the present embodiment, the outer radial lip 9g of the bending lip 9e is pulled radially outward by the centrifugal force even when the centrifugal force due to the rotation of the outer member 2 acts. By this, the interference with respect to the slinger 10 is increased, and it has high mud resistance. Furthermore, in the sealing member 6 according to the present embodiment, grease is enclosed in an annular space S1 having a substantially triangular cross section formed by the slinger 10 and the outer radial lip 9g of the bending lip 9e. As a result, muddy water can be suppressed from flowing into the bearing from the outside of the bearing, so it has high mud resistance.

  Further, in the present embodiment, the support portion 10c of the slinger 10 is opposed to the seal plate 7 via a slight radial gap, and the labyrinth seal 11 is configured. Thus, as in the conventional seal member shown in FIG. 7, the axial length of the labyrinth seal 11 is not limited to the thickness of the plate of the conventional slinger, but is extended over a wide region by the axial length of the support portion 10c. It is formed. Thereby, sealing performance (sealing performance) is improved, and an effective labyrinth seal 11 can be configured, and it is possible to suppress the entry of muddy water or the like into the inside of the seal. Further, even if muddy water or the like passes through the labyrinth seal 11 and enters the inside of the seal member 6, it is blocked by the bending lip 9e. Further, even if muddy water etc. pass through the outer radial lip 9g of the bending lip 9e and enter the annular space S1, the grease G is enclosed in the annular space S1, so the muddy water etc will be accumulated in the annular space S1. In addition, the inflow of muddy water and the like can be minimized as much as possible compared to the conventional seal member. Further, since the seal member 6 can stably hold the grease G in the annular space S1 closest to the labyrinth seal 11 among the plurality of annular spaces formed by the seal lip 9 and the slinger 10, it is more effective. Can reduce the inflow of muddy water. Therefore, it is possible to prevent the side lip from being worn out by foreign substances such as mud and sand contained in muddy water, etc., and to improve sealing performance and durability of the sealing member 6 for a long period of time. It is possible to provide a wheel bearing device that

  In addition, the tip of the side lip 9f, which is a bent portion of the bent lip 9e, is configured to be in contact with or close to the upright plate portion 10b of the slinger 10. The rotation of the outer member 2 causes the tip of the side lip 9f to wear gradually. The tip of the outer radial lip 9g, which is extended from the tip of the side lip 9f according to the degree of wear, contacts or approaches the inner circumferential surface of the support 10c. As a result, the outer radial lip 9g comes into contact with or further comes close to the support portion 10c with an appropriate interference.

  FIG. 3 shows the case where a gap is generated between the outer radial lip 9g of the bent lip 9e of the seal lip 9 of the first embodiment described above and the support portion 10c.

  The distal end of the outer radial lip 9g of the bending lip 9e is close to the inner side end portion of the inner peripheral surface of the support portion 10c via a predetermined radial gap d to form a labyrinth structure. Thus, in addition to the effect of suppressing the inflow of muddy water and the like by the labyrinth structure, the tip of the outer radial lip 9g is not in contact with the support portion 10c, so that the decrease in rotational torque can be suppressed.

  FIGS. 4 and 5 show a wheel bearing device 1A according to a second embodiment in which a seal member 6A is used instead of the seal member 6 in the wheel bearing device 1 according to the first embodiment described above. The seal member 6A is obtained by removing the side lip 9b from the seal lip 9 of the wheel bearing device 1 according to the first embodiment described above, but the configuration of the seal member is partially different from that of the first embodiment described above. The same reference numerals are given to the same parts and parts having the same function or parts having the same functions, and the detailed description will be omitted.

  As shown in FIG. 4, the seal lip 9A is obtained by removing the side lip 9b from the configuration of the seal lip 9 described above. In the seal lip 9A, since the sealing property is improved by the bending lip 9e, the sufficient sealing property can be secured even if the side lip 9b is reduced. In addition, since the side lip is small, the height of the cross section of the seal can be reduced. As a result, in addition to the same effects as the wheel bearing device 1 of the first embodiment described above, the seal member has a compact configuration in which the cross-sectional height of the lip having a sealing function such as side lip or radial lip is suppressed. be able to.

  FIG. 5 shows a case where a gap is generated between the outer radial lip 9g of the bending lip 9e of the seal lip 9A of the second embodiment described above and the support portion 10c.

The distal end of the outer radial lip 9g of the bending lip 9e is close to the inner side end portion of the inner peripheral surface of the support portion 10c via a predetermined radial gap d to form a labyrinth structure. Thereby, while having an effect similar to bearing apparatus 1 for wheels of a 1st embodiment mentioned above,
Since the sealability can be maintained by the side lip 9c having one contact or proximity and the bent lip 9e having two contacts or proximity, the number of side lips in the seal member is reduced to increase the cross sectional radial height of the seal lip The compact seal member can be configured with a reduced size.

FIG. 6 shows the wheel bearing device 50 of the third embodiment as still another embodiment of the wheel bearing device. The wheel bearing device 50 is a double row outward directed angular ball bearing type classified as a second generation type, and is an outer ring rotation type and for supporting a driven wheel. The wheel bearing device 50 includes an outer member 52 having a double row of rolling contact surfaces 54 on the inner periphery thereof and an inner member 53 having rolling contact surfaces 55 respectively facing the rolling contact surfaces 54; A double-row rolling element 56 is provided between the double-row rolling surfaces 54 and 55. The outer member 52 has a hub flange 52a for mounting a wheel on the outer periphery. A wheel (not shown) is attached to the hub flange 52 a by a hub bolt 60. The inward member 53 is composed of a split type inner ring in which two bearing inner rings 53A, 53A having the respective rolling surfaces 55 are arranged in the axial direction. An axle (not shown) is fixed to the inner diameter surface of the inner member 53. The rolling elements 56 are balls and are held by the cage 57 for each row. Both ends of an annular space formed between the outer member 52 and the inner member 53 are sealed by a pair of sealing members 6 shown in FIGS. 2 and 3. The wheel bearing device 50 has the same effects as the seal member 6 of the wheel bearing device 1 according to the first embodiment by providing the seal member 6.
Instead of the sealing member 6, the above-described sealing member 6A can be used.

  The wheel bearing device 1 disclosed in the present specification is an inward one configured by abutting the outer member 2 fitted to the hub wheel 25, the first inner member 31 and the second inner member 32 to each other. Although it is a 1st generation structure of the outward member rotation specification which has the member 3, It does not limit to this. For example, the first inward member rotation specification includes an outward member fitted in the housing, and one inward member configured by butting the first inward member and the second inward member to each other. It may be a generation structure. In addition, the outward member rotation specification has an outward member formed as a hub wheel, and one inward member configured by abutting a first inward member and a second inward member to each other. It may be a second generation structure. Furthermore, an inward member rotation specification having an outward member formed with a vehicle body mounting flange, and one inward member configured by butting a first inward member and a second inward member to each other It may be a second generation structure. In addition, it has a support shaft having a mounting flange to which one inner ring is fitted as an inward member, and an outer ring which is an outward member is formed as a hub wheel 3, and this hub wheel and the inward member It may be a third generation structure of an outer ring rotation specification configured by a certain inner ring and a fitting body of a support shaft. Furthermore, the hub wheel and the universal joint are connected as the inward member, and the outer ring which is the outward member having the mounting flange, the hub ring which is the inward member, and the fitting body of the universal joint are formed. It may be a fourth generation structure.

  Finally, the invention in the present application is not limited to the respective embodiments, but is merely an example, and it goes without saying that the invention can be embodied in various forms without departing from the scope of the present invention. The scope of the invention is indicated by the description of the claims, and further includes the equivalent meaning described in the claims, and all the modifications within the scope.

1, 1A, 50 wheel bearing device 2 outer member 2 c outer race surface 2 d outer race surface 3 inner member 31 first inner member 32 second inner member 3 c inner race surface 3 d inner race surface 41 Conical roller (rolling element)
6 seal member 6, 6A outer side seal member 7 seal plate 8 core metal 8a seal plate fitting portion 9, 9A seal lip 9a base 9b, 9c side lip 9e bent lip (outer side lip)
10 slinger 10a slinger fitting portion 10b upstanding plate portion 10c support portion G grease S1 annular space

Claims (3)

An outer member having a plurality of rows of outer raceways formed on the inner periphery,
An inner member having a plurality of rows of inner rolling surfaces opposed to the plurality of rows of outer rolling surfaces formed on an outer periphery thereof;
Double-row rolling elements rotatably accommodated between rolling surfaces of the outer member and the inner member;
And a seal member for sealing an internal space formed between the outer member and the inner member.
The seal member is a cored bar fitted to the outer member, and an annular seal plate formed of a plurality of seal lips integrally formed on the cored core and being elastic members;
A cylindrical fitting portion disposed opposite to the seal plate and fitted to the inward member, a rising plate portion extending radially outward from the fitting portion, and a bearing inward side from the rising plate portion A slinger comprising a support extending axially towards the
The seal lip includes a side lip extending toward the standing plate portion of the slinger, and an outer diameter side lip provided on an outer diameter side of the side lip and having a middle portion bent.
The bent portion of the outer diameter side lip contacts or approaches the upright plate portion and the tip of the outer diameter side lip contacts or approaches the support portion,
The bearing apparatus for wheels which sealed grease in the space constituted by said slinger and said outside diameter side lip.   The wheel bearing device according to claim 1, wherein the plurality of seal lips contact or approach only one of the side lip and one of the outer diameter side lip of the standing plate portion of the slinger. The cored bar has a seal plate fitting portion fitted to the outward member,
The wheel bearing device according to claim 1 or 2, wherein the support portion of the slinger is opposed to the seal plate fitting portion in the radial direction via a predetermined gap to constitute a labyrinth seal.

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