JP2017166548A - Wheel bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheel bearing device capable of preventing muddy water or dust from being immersed in a labyrinth.SOLUTION: A wheel bearing device 1 for rotatably supporting a wheel, comprises: an outer component having an outside rolling face formed on the inner peripheral side; an inner component that has an inside rolling face formed on the outer peripheral side and that is inserted in the outer component; and a seal member 10 for sealing an annular gap between the outer component and the inner component on the inner side of the wheel bearing device 1. The seal member 10 includes: a seal plate 11 fitted in an opening of the outer component; and a slinger 12 that opposes the seal plate 11 and is fitted in the periphery of the inner component. The slinger 12 includes: a radial lip contact part 12b disposed with a gap from the opening end surface of the outer component; and a cover part 12c disposed with a gap from the outer peripheral surface of the outer component. A groove part 21 is formed on a side opposing the opening end surface of the radial lip contact part 12b.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a wheel bearing device.

  2. Description of the Related Art Conventionally, a wheel bearing device that supports a wheel rotatably is known as a suspension device for an automobile or the like. In the wheel bearing device, a hub wheel (inner member) connected to the wheel is rotatably supported by the outer member via a rolling element.

  In the wheel bearing device, the grease inside the outer member is reduced, or rainwater and dust enter, so that the rolling surface of the rolling element or the inner member is damaged and the life of the wheel bearing device is shortened. . For this reason, in the wheel bearing device, a seal member is provided between the outer member and the inner member in order to prevent leakage of grease enclosed therein and to prevent intrusion of rainwater or dust from the outside. Is provided.

  In the wheel bearing device, a plurality of seal mechanisms are provided on the seal member in order to improve the sealing performance. For example, as a seal mechanism, a seal lip and a labyrinth seal are known (for example, Patent Document 1). In the wheel bearing device disclosed in Patent Document 1, a labyrinth seal formed by disposing a bent portion between rubber seal portions of a seal member is disclosed as a seal mechanism.

  However, the labyrinth disclosed in Patent Document 1 communicates with the outside of the vehicle. Therefore, muddy water or dust may enter the labyrinth. When muddy water or dust enters the labyrinth, the tip portion of the seal lip is damaged, and the sealing performance of the seal member is lowered.

JP 2010-91036 A

  Therefore, an object of the present invention is to provide a wheel bearing device that can prevent muddy water or dust from entering the labyrinth.

That is, in this invention, it is a wheel bearing device which supports a wheel rotatably, Comprising: The outer member in which an outer side rolling surface is formed in an inner peripheral side, and an inner side rolling surface is formed in an outer peripheral side. And an inner member inserted into the outer member, a rolling element movably interposed between the outer rolling surface and the inner rolling surface, and the inner side of the wheel bearing device, A seal member that seals an annular space between the outer member and the inner member, the seal member facing the seal plate, a seal plate fitted into an opening of the outer member, and A slinger fitted to the outer peripheral portion of the inner member, and the slinger is provided with a first wall portion arranged with a gap from an opening end surface of the outer member, and an outer peripheral surface of the outer member. And a second wall portion disposed with a gap,
An uneven portion is formed on at least one of the side of the first wall portion facing the opening end surface and the side of the second wall portion facing the outer peripheral surface.

  In the present invention, an uneven portion is formed on at least one of the side of the opening end surface facing the first wall portion and the side of the outer peripheral surface facing the second wall portion. is there.

  In the present invention, the concavo-convex portion formed on the first wall portion is inclined by a predetermined angle with respect to a groove formed radially from the axis of the inner member or radiation from the axis of the inner member. The grooves are formed as described above.

  In the present invention, the concavo-convex portion formed on the second wall portion is formed in a groove formed in parallel to the axis of the inner member or in a spiral shape with respect to the axis of the inner member. It is a groove.

  That is, according to the wheel bearing device of the present invention, the uneven portion formed on the slinger sweeps out muddy water or dust, thereby preventing muddy water or dust from entering the labyrinth.

The perspective view which shows the whole structure of the wheel bearing apparatus which is this embodiment. Similarly sectional drawing. The expanded sectional view which shows the structure of the sealing member of FIG. The expanded sectional view which shows the groove part in 1st embodiment which expanded FIG. 3 further. The expanded sectional view which shows the groove part in 2nd embodiment which expanded FIG. 3 further. The expanded sectional view which shows the groove part in 3rd embodiment which expanded FIG. 3 further. The expanded sectional view which shows the groove part in 4th embodiment which expanded FIG. 3 further. The expanded sectional view which shows the groove part in 5th embodiment which expanded FIG. 3 further.

A wheel bearing device 1 according to this embodiment will be described with reference to FIGS. 1 and 2.
FIG. 1 is a perspective view showing the overall configuration of the wheel bearing device 1. FIG. 2 shows an overall configuration of the wheel bearing device 1 by an AA sectional view in FIG. Below, it demonstrates according to the inner side and outer side which are shown by FIG.1 and FIG.2.

  The wheel bearing device 1 according to this embodiment is a suspension device for a vehicle such as an automobile, and supports the wheel rotatably. The wheel bearing device 1 includes an outer member 2, an inner member 3, two rows of inner ball rows 6 a and outer ball rows 6 b that are rolling rows, an outer seal member 7, and an inner seal as a seal member. And a member 10. The inner member 3 includes a hub ring 4 and an inner ring 5.

  The outer member 2 is formed in a substantially cylindrical shape and is made of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C. The outer member 2 includes an inner side opening 2a, an outer side opening 2b, an inner side outer rolling surface 2c, an outer side outer rolling surface 2d, a flange 2e, and an outer groove 2f. I have.

  The inner side opening 2a is formed at the inner side end of the outer member 2, and the inner seal member 10 is fitted therein. The outer opening 2b is formed at the outer end of the outer member 2, and the outer seal member 7 is fitted therein.

  The outer rolling surface 2c and the outer rolling surface 2d are formed in an annular shape along the circumferential direction on the inner circumferential surface of the outer member 2 so as to be parallel to each other. The outer rolling surface 2d is formed such that the pitch circle diameter is equal to or larger than that of the outer rolling surface 2c. A hardened layer having a surface hardness in the range of 58 to 64 HRC is formed on the outer rolling surface 2c and the outer rolling surface 2d by high-frequency heat treatment.

  The vehicle body attachment flange 2e is integrally formed on the outer peripheral surface of the outer member 2 for attachment to a knuckle of a suspension device (not shown). The outer groove 2f is formed in an annular shape on the outer peripheral surface of the inner side opening 2a in order to drain rainwater from the outside.

  The inner member 3 supports a vehicle wheel (not shown) in a freely rotatable manner. The inner member 3 is inserted into the outer member 2. The inner member 3 includes a hub ring 4 and an inner ring 5.

  The hub wheel 4 is made of a medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C formed in a bottomed cylindrical shape. The hub wheel 4 includes a small-diameter step portion 4a, a flange 4b, an inner rolling surface 4c, and a hub bolt 4d.

  The small diameter step 4 a is formed at the inner side end of the hub wheel 4. The wheel mounting flange 4b is formed integrally with the hub wheel 4 at the outer side end of the hub wheel 4 in order to mount the wheel. The inner rolling surface 4 c is formed in an annular shape along the circumferential direction on the outer peripheral surface on the outer side of the hub wheel 4. The hub bolts 4d are provided at equidistant positions in the circumferential direction of the wheel mounting flange 4b.

  The inner ring 5 is press-fitted into the small-diameter step 4 a at the inner side end of the hub ring 4. The inner ring 5 is made of high carbon chrome bearing steel such as SUJ2, and is hardened in the range of 58 to 64 HRC up to the core part by quenching. The inner ring 5 is integrally fixed to the inner side end of the hub ring 4 in a state where a predetermined preload is applied by press-fitting.

  An annular inner rolling surface 5 a is formed on the outer peripheral surface of the inner ring 5 along the circumferential direction. That is, the inner raceway 5 a is configured by the inner race 5 on the inner side of the hub race 4. The hub wheel 4 is hardened by high-frequency heat treatment from the inner-side small-diameter stepped portion 4a to the outer-side wheel mounting flange seal sliding surface 4e in a range of 58 to 64 HRC. Thereby, the hub wheel 4 has sufficient mechanical strength against the rotational bending load applied to the wheel mounting flange 4b, and the durability of the hub wheel 4 is improved.

  In the hub wheel 4 and the inner ring 5, the inner rolling surface 5 a formed on the inner ring 5 at the inner end is opposed to the outer rolling surface 2 c on the inner side of the outer member 2 and is formed on the outer side. The inner rolling surface 4 c is disposed so as to face the outer rolling surface 2 d on the outer side of the outer member 2.

  The inner ball row 6a and the outer ball row 6b support the hub wheel 4 rotatably. In the inner ball row 6a and the outer ball row 6b, a plurality of balls as rolling elements are held in an annular shape by a cage. The inner ball row 6a and the outer ball row 6b are made of high carbon chrome bearing steel such as SUJ2, and are hardened in the range of 58 to 64 HRC to the core portion by quenching.

  The outer ball row 6b is configured such that the pitch circle diameter is equal to or larger than that of the inner ball row 6a. The inner ball row 6a rolls between an inner rolling surface 5a formed on the inner ring 5 and an outer rolling surface 2c on the inner side of the outer member 2 facing the inner rolling surface 5a. It is sandwiched freely.

  The outer ball row 6b rolls between an inner rolling surface 4c formed on the hub wheel 4 and an outer rolling surface 2d on the outer side of the outer member 2 facing the inner rolling surface 4c. It is sandwiched freely. That is, the inner ball row 6 a and the outer ball row 6 b support the hub wheel 4 and the inner ring 5 so as to be rotatable with respect to the outer member 2.

  Further, the wheel bearing device 1 of the present embodiment is configured as a double row angular ball bearing including an outer member 2, a hub wheel 4, an inner ring 5, an inner ball row 6a, and an outer ball row 6b. However, the present invention is not limited to this. For example, this invention may be comprised with the double row tapered roller bearing.

  In the present embodiment, the wheel bearing device 1 is configured as a wheel bearing device 1 having a third generation structure in which the inner raceway surface 4c of the inner ball row 6a is formed on the outer periphery of the hub wheel 4. The present invention is not limited to this. For example, the present invention is based on the second generation structure in which a pair of inner rings 5 are press-fitted and fixed to the hub ring 4, or the outer ring that is the outer member 2 without the hub ring 4 and the inner ring 5 that is the inner member. A configured first generation structure may be used.

  The inner seal member 10 seals the annular space on the inner side between the outer member 2 and the inner member 3. More specifically, the inner seal member 10 closes the gap between the inner side opening 2 a of the outer member 2 and the inner ring 5. The inner seal member 10 includes a substantially cylindrical seal plate 8 and a substantially cylindrical slinger 9. Details of the inner seal member 10 will be described later.

  The outer seal member 7 seals the outer annular space between the outer member 2 and the inner member 3. More specifically, the outer seal member 7 closes the gap between the outer opening 2 b of the outer member 2 and the hub wheel 4. The outer seal member 7 is configured as an integral seal in which a seal lip is vulcanized and bonded to a substantially cylindrical cored bar.

  The core is made of a ferritic stainless steel plate (JIS standard SUS430 or the like), an austenitic stainless steel plate (JIS standard SUS304 or the like), or a rust-proof cold rolled steel plate (JIS standard SPCC system or the like). It is configured. The core metal is formed in a substantially L shape in a sectional view in the axial direction by bending the outer edge portion of the annular steel plate by pressing.

  The seal lip is NBR (acrylonitrile-butadiene rubber), HNBR (hydrogenated acrylonitrile-butadiene rubber) excellent in heat resistance, EPDM (ethylene propylene rubber), ACM (polyacrylic rubber) excellent in heat resistance and chemical resistance, It is composed of synthetic rubber such as FKM (fluoro rubber) or silicon rubber.

  In the outer seal member 7, the cored bar is fitted in the outer side opening 2 b of the outer member 2. The outer seal member 7 is disposed so that the seal lip contacts the wheel mounting flange seal sliding surface 4 e of the hub wheel 4. The outer seal member 7 is configured to be slidable with respect to the wheel mounting flange seal sliding surface 4e when the seal lip comes into contact with the wheel mounting flange seal sliding surface 4e of the hub wheel 4 through the oil film. Thereby, the seal lip of the outer seal member 7 prevents leakage of lubricating grease from the outer side opening 2b of the outer member 2 and intrusion of rainwater, dust, and the like from the outside.

  The wheel bearing device 1 is configured as a double row angular ball bearing by including an outer member 2, an inner member 3 (hub wheel 4 and inner ring 5), an inner ball row 6a, and an outer ball row 6b. Has been. The hub wheel 4 and the inner ring 5 are rotatably supported by the outer member 2 via an inner ball row 6a and an outer ball row 6b.

  In the wheel bearing device 1, the gap between the inner side opening 2 a of the outer member 2 and the inner ring 5 is closed by the inner seal member 10, and the gap between the outer side opening 2 b of the outer member 2 and the hub ring 4. Is closed with an outer seal member 7. With this configuration, in the wheel bearing device 1, the hub wheel supported by the outer member 2 while preventing leakage of lubricating grease from the inside and intrusion of rainwater and dust from the outside. 4 and the inner ring 5 rotate.

The configuration of the inner seal member 10 as a seal member will be described with reference to FIG.
FIG. 3 shows the configuration of the inner seal member 10 with an enlarged cross-sectional view of FIG.

  The inner seal member 10 includes a seal plate 11 and a slinger 12. The seal plate 11 includes a cored bar. The core is made of a ferritic stainless steel plate (JIS standard SUS430 or the like), an austenitic stainless steel plate (JIS standard SUS304 or the like), or a rust-proof cold rolled steel plate (JIS standard SPCC system or the like). It is configured.

  The core metal is formed in a substantially L shape in an axial sectional view by bending the outer edge of an annular steel plate by press working. The core metal includes a cylindrical seal plate fitting portion 11a and an annular lip support portion 11b extending from the end of the seal plate fitting portion 11a toward the axis.

  A sealing material is vulcanized and bonded to the fitting surface of the seal plate fitting portion 11a. A radial lip 11c, an inner axial lip 11d, and an outer axial lip 11e are integrally vulcanized and bonded to the inner side surface of the lip support portion 11b.

  Radial lip 11c, inner axial lip 11d and outer axial lip 11e are NBR (acrylonitrile-butadiene rubber), HNBR (hydrogenated acrylonitrile-butadiene rubber), EPDM (ethylene propylene rubber), heat resistance, chemical resistance It is made of synthetic rubber such as ACM (polyacrylic rubber), FKM (fluorine rubber), or silicon rubber, which has excellent properties.

  The seal plate 11 is configured integrally with the outer member 2 by fitting the seal plate fitting portion 11 a to the inner side opening 2 a of the outer member 2. The seal plate 11 is disposed so that the inner side surface of the lip support portion 11 b faces the outside of the outer member 2.

  The slinger 12 is made of a steel plate equivalent to the seal plate 11. The slinger 12 is formed in a substantially U shape in an axial cross-sectional view by bending an outer edge portion and an inner edge portion of an annular steel plate by press working.

  The slinger 12 is formed with a radial lip contact portion 12a, an axial lip contact portion 12b as a first wall portion, and a cover portion 12c as a second wall portion. The radial lip contact portion 12a is formed in a cylindrical shape. The axial lip contact portion 12b is formed in an annular shape, and extends radially outward from the end portion of the radial lip contact portion 12a. The cover portion 12c extends from the outer edge portion of the axial lip contact portion 12b along the axial direction.

  The slinger 12 has a radial lip contact portion 12 a fitted to the inner ring 5. The slinger 12 is provided on the outer side of the outer member 2 with respect to the seal plate 11. The slinger 12 is formed in a substantially U shape in an axial sectional view. The slinger 12 has an axial lip contact portion 12b, an inner side surface of the lip support portion 11b of the seal plate 11, and an inner side end surface of the outer member 2 so that the opening side of the slinger 12 faces the inner side of the outer member 2. It arrange | positions so that it may oppose.

  The slinger 12 is disposed so that the inner peripheral surface of the cover portion 12 c faces the outer peripheral surface of the inner side end portion of the outer member 2. The cover portion 12 c of the slinger 12 covers the outer groove 2 f for draining the outer member 2. The axial lip contact portion 12 b of the slinger 12 covers the inner side end surface of the outer member 2. The axial lip contact portion 12b of the slinger 12 is provided with a magnetized body 13 constituting an encoder.

  In the inner seal member 10, a first passage L1 and a second passage L2 are formed as a labyrinth seal. Specifically, the first passage L <b> 1 is formed by providing a predetermined gap between the axial lip contact portion 12 b as the first wall portion and the inner side end surface of the outer member 2. The second passage L2 is formed by providing a predetermined gap between the cover portion 12c as the first wall portion and the outer peripheral surface of the outer member 2.

  Thus, the inner seal member 10 is disposed so that the seal plate 11 fitted to the inner side opening 2a of the outer member 2 and the slinger 12 fitted to the inner ring 5 face each other. In the inner seal member 10, the radial lip 11c of the seal plate 11 is in contact with the radial lip contact portion 12a of the slinger 12 through the oil film, and the inner axial lip 11d of the seal plate 11 is in contact with the axial lip contact portion of the slinger 12 through the oil film. 12b is in contact.

  On the other hand, the outer axial lip 11 e of the seal plate 11 is not in contact with the axial lip contact portion 12 b of the slinger 12. The inner seal member 10 is configured to be slidable with respect to the slinger 12 when the radial lip 11c and the inner axial lip 11d of the seal plate 11 contact the slinger 12 via an oil film. In this manner, the inner seal member 10 can prevent leakage of lubricating grease from the inner side opening 2a of the outer member 2 or intrusion of rainwater and dust from the outside.

The groove part 21 of 1st embodiment is demonstrated using FIG.
FIG. 4A shows the groove portion 21 by a further enlarged cross-sectional view of FIG. FIG. 4B shows an arrow B1 in FIG.

  The groove part 21 is 1st embodiment of the uneven | corrugated | grooved part of this invention. The groove portion 21 is formed on the side of the axial lip contact portion 12b as the first wall portion that faces the inner side end surface of the outer member 2. In other words, the groove 21 is formed on the inner side of the first passage L1.

  Specifically, the groove portion 21 is formed radially with respect to the axis of the inner member 3 in the axial lip contact portion 12b. The plurality of groove portions 21 are formed at predetermined intervals. The shape of the groove portion 21 is a concave shape in a sectional view, but may be a U shape.

The operation of the groove 21 will be described.
For example, when muddy water or dust enters the first passage L1, the muddy water or dust that has entered enters the axial lip contact portion 12b, and the contacted muddy water or dust catches on the groove portion 21, and the muddy water or dust enters the groove portion. 21 will be blocked. At this time, since the axial lip contact portion 12b rotates at high speed, an outward force acts on the shaft of the inner member 3 by centrifugal force on the muddy water or dust caught in the groove portion 21, and the groove portion 21 is affected. The caught muddy water or dust is swept out of the first passage L1.

The effect of the groove portion 21 will be described.
When the groove portion 21 sweeps muddy water or dust, muddy water or dust can be prevented from entering the first passage L1.

The groove part 22 of 2nd embodiment is demonstrated using FIG.
FIG. 5A shows the groove portion 22 by a further enlarged cross-sectional view of FIG. FIG. 5B shows an arrow B2 in FIG.

  The groove part 22 is 2nd embodiment of the uneven | corrugated | grooved part of this invention. The groove portion 22 is formed on the side of the axial lip contact portion 12b as the first wall portion that faces the inner side end surface of the outer member 2. In other words, the groove 22 is formed on the inner side of the first passage L1.

  Specifically, the groove portion 22 is formed at a predetermined angle with respect to the radiation from the axis of the inner member 3 in the axial lip contact portion 12b. The plurality of groove portions 22 are formed at predetermined intervals. The present embodiment is inclined by 15 ° with respect to the radiation from the axis of the inner member 3, but is not limited to this and may be in the range of 5 ° to 45 °. The shape of the groove 22 is a concave shape in a cross-sectional view, but may be a U-shape. The inclination of the groove portion 23 is formed so that the outer peripheral side of the groove portion 23 is directed rearward in the rotational direction in the left and right wheels of the vehicle.

  Since the operation and effect of the groove portion 22 are the same as those of the groove portion 21, description thereof is omitted.

The groove part 23 of 3rd embodiment is demonstrated using FIG.
FIG. 6A shows the groove portion 23 by a further enlarged cross-sectional view of FIG. FIG. 6B shows an arrow B3 in FIG.

  The groove part 23 is 3rd embodiment of the uneven | corrugated | grooved part of this invention. In addition, this embodiment assumes that the groove part 21 of 1st embodiment or the groove part 22 of 2nd embodiment is formed. The groove portion 23 is formed on the side facing the axial lip contact portion 12 b as the first wall portion of the inner side end surface of the outer member 2. In other words, the groove 23 is formed on the outer side of the first passage L1.

  Specifically, the groove portion 23 is formed radially on the inner side end surface of the outer member 2 with respect to the axis of the inner member 3. The plurality of groove portions 23 are formed at predetermined intervals. The shape of the groove 23 is a concave shape in a sectional view, but may be a U-shape. Further, like the groove portion 22, the groove portion 23 may be formed at a predetermined interval inclined by a predetermined angle with respect to the radiation from the axis of the inner member 3. Moreover, the groove part 23 may be formed in the side facing the cover part 12c as a 2nd wall part of the outer peripheral surface of the outward member 2. As shown in FIG.

  In addition, the groove part 23 may be formed by roughening the surface of the lathe when the inner side end face or the outer peripheral face of the outer member 2 is manufactured.

  Since the effect of the groove part 23 improves the effect of the groove part 21 or the groove part 22, description is abbreviate | omitted.

The groove part 24 of 4th embodiment is demonstrated using FIG.
FIG. 7A shows the groove 24 in a cross-sectional view further enlarging FIG. FIG. 7B shows an arrow B4 in FIG.

  The groove part 24 is 4th embodiment of the uneven | corrugated | grooved part of this invention. The groove portion 24 is formed on the side of the cover portion 12c as the second wall portion that faces the outer peripheral surface of the outer member 2. In other words, the groove 25 is formed on the outer peripheral side in the axial direction of the second passage L2.

  Specifically, the groove portion 24 is formed in parallel to the axis of the inner member 3 in the cover portion 12c. The plurality of groove portions 24 are formed at predetermined intervals. The shape of the groove 24 is a concave shape in cross-sectional view, but may be a U-shape.

The operation of the groove 24 will be described.
For example, when muddy water or dust enters the second passage L2, the muddy water or dust that has entered contacts the cover portion 12c, and the muddy water or dust that has come into contact with the groove portion 24. Will be blocked. At this time, since the cover portion 12c rotates at a high speed, the muddy water or dust caught in the groove portion 24 is swept out of the second passage L2.

The effect of the groove 24 will be described.
When the groove 24 sweeps out muddy water or dust, muddy water or dust can be prevented from entering the second passage L2.

The groove part 25 of 5th embodiment is demonstrated using FIG.
FIG. 8A shows the groove portion 25 in a cross-sectional view further enlarging FIG. FIG. 8B shows an arrow B5 in FIG.

  The groove part 25 is 5th embodiment of the uneven | corrugated | grooved part of this invention. The groove part 25 is formed in the side facing the outer peripheral surface of the outer member 2 of the cover part 12c as a 2nd wall part. In other words, the groove 25 is formed on the outer peripheral side in the axial direction of the second passage L2.

  Specifically, the groove portion 25 is formed in a spiral shape with respect to the axis of the inner member 3 in the cover portion 12c. The direction of the spiral of the groove 25 is toward the outer side with respect to the axis of the inner member 3. The plurality of groove portions 25 are formed at predetermined intervals. The shape of the groove 25 is a concave shape in a cross-sectional view, but may be a U-shape.

The operation of the groove 25 will be described.
For example, when muddy water or dust enters the first passage L1, the muddy water or dust that has entered the contact with the cover portion 12c, the muddy water or dust that has come into contact with the groove portion 25, the muddy water or dust intrusion is caused by the groove portion 25. Will be blocked. At this time, since the cover portion 12c rotates at a high speed, the muddy water or dust caught in the groove portion 25 is swept out spirally toward the outside of the second passage L2.

  About the effect of the groove part 25, since it is the same as that of the groove part 24, description is abbreviate | omitted.

  As mentioned above, although 1st embodiment-5th embodiment were described, this invention is not limited to these. The present invention may be a combination of some of these, for example.

DESCRIPTION OF SYMBOLS 1 Wheel bearing apparatus 2 Outer member 2a Inner side opening 3 Inner member 4 Hub wheel 6a Inner ball row 6b Outer ball row 7 Outer seal member 10 Inner seal member (seal member)
11 Seal plate 12 Slinger 12b Radial lip contact part (first wall part)
12c Cover part (second wall part)
21 Groove

Claims (4)

A wheel bearing device for rotatably supporting a wheel,
An outer member having an outer rolling surface formed on the inner peripheral side;
An inner member that is formed on the outer peripheral side and is inserted into the outer member while an inner rolling surface is formed,
A rolling element movably interposed between the outer rolling surface and the inner rolling surface;
A seal member for sealing an annular space between the outer member and the inner member inside the wheel bearing device;
With
The seal member includes a seal plate fitted to the opening of the outer member, and a slinger fitted to the outer peripheral portion of the inner member while facing the seal plate,
The slinger includes a first wall portion disposed with a clearance from the opening end surface of the outer member, and a second wall portion disposed with a clearance from the outer peripheral surface of the outer member,
A concavo-convex portion is formed on at least one of the side facing the opening end surface of the first wall portion and the side facing the outer peripheral surface of the second wall portion,
Wheel bearing device. The wheel bearing device according to claim 1,
A concavo-convex portion is formed on at least one of the side facing the first wall portion of the opening end surface and the side facing the second wall portion of the outer peripheral surface,
Wheel bearing device. The wheel bearing device according to claim 1 or 2,
The concavo-convex portion formed on the first wall portion is a groove formed radially from the axis of the inner member, or a groove formed so as to be inclined at a predetermined angle with respect to the radiation from the axis of the inner member. And
Wheel bearing device. The wheel bearing device according to any one of claims 1 to 3,
The concavo-convex portion formed on the second wall portion is a groove formed in parallel with the axis of the inner member, or a groove formed in a spiral shape with respect to the axis of the inner member.
Wheel bearing device.