阅读说明：本技术 车轮用轴承装置 (Bearing device for wheel ) 是由 樱井良 信川爱纯 于 2019-08-06 设计创作，主要内容包括：本发明的课题在于提供在将外构件的嵌合筒部嵌入车身侧构件的嵌合孔部时,罩构件的嵌合部不与嵌合孔部的内周缘干涉的车轮用轴承装置。在外构件(2)的内侧端部形成的嵌合筒部(2h)嵌入到车身侧构件(9)的嵌合孔部(9h)的状态下被固定的车轮用轴承装置(1)中,在嵌合筒部(2h)的外侧形成有大径部(2i),在嵌合筒部(2h)的内侧形成有小径部(2j),罩构件(8)通过将金属钢板弯折而形成,且具有将外构件(2)的内侧开口端封闭的盖板部(81)和外嵌于小径部(2j)的嵌合部(82),并在嵌合部(82)的外侧端部的外周缘设置有基于嵌合部(82)的回弹角度(θ)而形成的锥形加工部分(83)。(The present invention addresses the problem of providing a wheel bearing device in which, when a fitting cylindrical portion of an outer member is fitted into a fitting hole portion of a vehicle body-side member, the fitting portion of a cover member does not interfere with the inner peripheral edge of the fitting hole portion. In a wheel bearing device (1) in which a fitting cylinder section (2h) formed at the inner end of an outer member (2) is fixed in a state in which the fitting cylinder section (2h) is fitted into a fitting hole section (9h) of a vehicle body side member (9), a large diameter section (2i) is formed on the outer side of the fitting cylinder section (2h), a small diameter section (2j) is formed on the inner side of the fitting cylinder section (2h), a cover member (8) is formed by bending a metal steel plate, and has a cover plate section (81) for closing the inner opening end of the outer member (2) and a fitting section (82) fitted to the small diameter section (2j), and a tapered processing section (83) formed on the basis of the rebound angle (theta) of the fitting section (82) is provided on the outer peripheral edge of the outer end of the fitting section (82).)

1. A wheel bearing device is provided with:

an outer member having an outer raceway surface formed thereon;

an inner member including a hub ring and at least one inner ring externally fitted to the hub ring, and having an inner raceway surface formed thereon;

a rolling member interposed between the track surfaces of the outer member and the inner member; and

a cover member externally fitted to the outer member,

the wheel bearing device is fixed in a state where a fitting cylindrical portion formed at an inner end of the outer member is fitted into a fitting hole portion of a vehicle body side member,

the bearing device for a wheel is characterized in that,

a large diameter part is formed on the outer side of the fitting cylinder part,

a small diameter part is formed on the inner side of the fitting cylinder part,

the cover member is formed by bending a metal steel plate, and has a cover plate portion that closes an inner open end of the outer member and a fitting portion that is fitted to the small diameter portion, and a tapered portion formed based on a spring back angle of the fitting portion is provided on an outer peripheral edge of an outer end portion of the fitting portion.

2. The wheel bearing apparatus according to claim 1,

the angle of the outer peripheral surface of the fitting portion with respect to the rotation axis of the inner member is R1,

and the angle of the outer peripheral surface of the tapered portion with respect to the outer peripheral surface of the fitting portion is R2,

the relation R1 ≦ R2 holds.

3. The wheel bearing apparatus according to claim 1 or 2,

the inner diameter of the fitting portion is set to D1,

the outer diameter of the small diameter portion is set to D2,

the outer diameter of the fitting portion is set to D3,

when the outer diameter of the large diameter portion is D4,

the relation D1 ≦ D2 and the relation D3 ≦ D4 holds.

4. The wheel bearing device according to any one of claims 1 to 3,

the wheel bearing device includes:

an encoder that rotates integrally with the inner member; and

a sensor that is close to the encoder and detects magnetism of the encoder,

the cover member supports the sensor.

Technical Field

The present invention relates to a bearing device for a wheel.

Background

Conventionally, a wheel bearing device for rotatably supporting a wheel is known. In the wheel bearing device, an inner member is disposed inside an outer member, and rolling members are interposed between respective raceway surfaces of the outer member and the inner member. Thus, the wheel bearing device constitutes a rolling bearing structure, and allows the wheel attached to the inner member to rotate freely.

However, in the wheel bearing device, an annular space is formed between the outer member and the inner member. When muddy water enters the annular space, the track surface and the rolling members are damaged by dust and the like contained in the muddy water, and as a result, the bearing life is shortened. Therefore, such a wheel support bearing device includes a seal member and a cover member to prevent muddy water from entering an annular space (see patent documents 1 and 2).

The cover member disclosed in patent document 1 and patent document 2 is formed by cutting a metal steel plate by press working and bending the metal steel plate. The cover member has: a cover plate portion that closes the inner opening end of the outer member; and an engaging portion which is externally engaged with the engaging cylindrical portion of the outer member. The cover member is not only for preventing the ingress of muddy water but also has a function of supporting the sensor.

Further, this type of wheel bearing device is fixed in a state where the fitting cylindrical portion of the outer member is fitted into the fitting hole portion of the vehicle body side member. Therefore, the assembling property of the automobile is improved as long as the fitting cylindrical portion of the outer member can be smoothly fitted into the fitting hole portion of the vehicle body side member. However, if the fitting portion of the cover member is opened radially outward by springback or the like, the fitting portion may interfere with the inner peripheral edge of the fitting hole portion and may not be smoothly fitted (see fig. 8). Accordingly, there is a need for a wheel bearing device in which, when the fitting cylindrical portion of the outer member is fitted into the fitting hole of the vehicle body side member, the fitting portion of the cover member does not interfere with the inner peripheral edge of the fitting hole, and the ease of assembly of the vehicle can be improved.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2017-145895

Patent document 2: japanese patent laid-open publication No. 2016-78512

Disclosure of Invention

Problems to be solved by the invention

Provided is a bearing device for a wheel, which can improve the assembly performance of an automobile by preventing the fitting part of a cover member from interfering with the inner periphery of a fitting hole when the fitting cylindrical part of an outer member is fitted into the fitting hole of a vehicle body side member.

Means for solving the problems

A first aspect of the present invention is a wheel bearing device including:

an outer member having an outer raceway surface formed thereon;

an inner member including a hub ring and at least one inner ring externally fitted to the hub ring, and having an inner raceway surface formed thereon;

a rolling member interposed between the track surfaces of the outer member and the inner member; and

a cover member externally fitted to the outer member,

the wheel bearing device is fixed in a state where a fitting cylindrical portion formed at an inner end portion of the outer member is fitted into a fitting hole portion of a vehicle body side member,

a large diameter part is formed on the outer side of the fitting cylinder part,

a small diameter part is formed on the inner side of the fitting cylinder part,

the cover member is formed by bending a metal steel plate, and has a cover plate portion that closes an inner open end of the outer member and a fitting portion that is fitted to the small diameter portion, and a tapered portion formed based on a spring back angle of the fitting portion is provided on an outer peripheral edge of an outer end portion of the fitting portion.

Second invention in the wheel support bearing assembly according to the first invention,

the angle of the outer peripheral surface of the fitting portion with respect to the rotation axis of the inner member is R1,

and the angle of the inclined surface of the tapered portion with respect to the outer peripheral surface of the fitting portion is R2,

the relation R1 ≦ R2 holds.

Third invention in the wheel support bearing assembly according to the first or second invention,

the inner diameter of the fitting portion is set to D1,

the outer diameter of the small diameter portion is set to D2,

the outer diameter of the fitting portion is set to D3,

when the outer diameter of the large diameter portion is D4,

the relation D1 ≦ D2 and the relation D3 ≦ D4 holds.

A fourth aspect of the invention provides the wheel support bearing assembly of any one of the first to third aspects,

the wheel bearing device includes:

an encoder that rotates integrally with the inner member; and

a sensor that is close to the encoder and detects magnetism of the encoder,

the cover member supports the sensor.

Effects of the invention

The effects of the present invention are as follows.

In the wheel bearing device according to the first aspect of the invention, the large diameter portion is formed on the outer side of the fitting cylinder portion, and the small diameter portion is formed on the inner side of the fitting cylinder portion. The cover member is formed by bending a metal steel plate, and has a cover plate portion that closes an inner open end of the outer member and a fitting portion that is fitted to the outside of the small diameter portion, and a tapered portion formed based on a spring back angle of the fitting portion is provided on an outer peripheral edge of an outer end portion of the fitting portion. According to this wheel support bearing device, when the fitting cylindrical portion of the outer member is fitted into the fitting hole of the vehicle body side member, the fitting portion of the cover member does not interfere with the inner peripheral edge of the fitting hole, and the ease of assembly of the vehicle can be improved.

In the wheel support bearing assembly according to the second aspect of the present invention, the relationship R1 ≦ R2 is satisfied when the angle of the outer peripheral surface of the fitting portion with respect to the rotation axis of the inner member is R1 and the angle of the inclined surface of the tapered portion with respect to the outer peripheral surface of the fitting portion is R2. According to the wheel bearing device, the fitting portion of the cover member can be reliably prevented from interfering with the inner peripheral edge of the fitting hole portion. Therefore, the assembling property of the automobile can be further improved.

In the wheel support bearing assembly according to the third aspect of the present invention, when the inner diameter of the fitting portion is D1, the outer diameter of the small diameter portion is D2, the outer diameter of the fitting portion is D3, and the outer diameter of the large diameter portion is D4, the relational expression D1 ≦ D2 and the relational expression D3 ≦ D4 are satisfied. According to the wheel bearing device, even if the fitting portion is strongly pressed into the small diameter portion to prevent the fitting portion from coming off, the fitting portion of the cover member can be reliably prevented from interfering with the inner peripheral edge of the fitting hole portion. Therefore, the cover member can be prevented from falling off, and the assembling property of the automobile can be further improved.

The wheel support bearing device according to the fourth aspect of the present invention includes an encoder that rotates integrally with the inner member, and a sensor that is in proximity to the encoder and detects magnetism of the encoder. Also, the cover member supports the sensor. According to this wheel support bearing device, since no strain is generated in the cover plate portion of the cover member, variation in the gap between the encoder and the sensor does not occur.

Drawings

Fig. 1 is a diagram showing a structure of a wheel bearing device.

Fig. 2 is a view showing a partial structure of the wheel bearing device.

Fig. 3 is a view showing a state in which the cover member is fitted to the fitting cylinder portion of the outer member.

Fig. 4 is a view showing a state in which the fitting cylindrical portion of the outer member is fitted into the fitting hole portion of the vehicle body side member.

Fig. 5 is a diagram showing the shape of a main part of the cover member of the first embodiment.

Fig. 6 is a diagram showing a shape of a main portion of a cover member of the second embodiment.

Fig. 7 is a diagram showing a shape of a main portion of a cover member of the third embodiment.

Fig. 8 is a diagram illustrating a state in which the fitting portion of the cover member interferes with the inner peripheral edge of the fitting hole portion.

Detailed Description

The wheel bearing device 1 of the present invention will be explained. Fig. 1 is a diagram showing a structure of a wheel bearing device 1. Fig. 2 is a view showing a partial structure of the wheel bearing device 1.

The wheel bearing device 1 is a device for rotatably supporting a wheel. The wheel bearing device 1 includes an outer member 2, an inner member 3, and rolling members 4 and 5. In the present specification, "inner" indicates the vehicle body side of the wheel bearing device 1 when attached to the vehicle body, and "outer" indicates the wheel side of the wheel bearing device 1 when attached to the vehicle body. In addition, "radially outer" indicates a direction away from the rotation axis a of the inner member 3, and "radially inner" indicates a direction closer to the rotation axis a of the inner member 3. Also, "axial direction" means a direction along the rotation axis a of the inner member 3.

The outer member 2 is a member constituting an outer ring portion of the rolling bearing structure. A fitting surface 2a is formed on the inner periphery of the inner end of the outer member 2. Further, a fitting surface 2b is formed on the inner periphery of the outer end of the outer member 2. Two outer raceway surfaces 2c and 2d are formed on the inner periphery of the axial center portion of the outer member 2. Further, a vehicle body attachment flange 2e that extends radially outward is formed on the outer member 2. The vehicle body attachment flange 2e is provided with a plurality of bolt holes 2 f.

The inner member 3 is a member constituting an inner ring portion of the rolling bearing structure. The inner member 3 includes a hub ring 31 and an inner ring 32.

The hub wheel 31 is disposed inside the outer member 2. An inner ring fitting portion 3a is formed on the outer periphery of the inner end portion of the hub wheel 31 up to the axial center portion. The inner ring fitting portion 3a is a portion where the outer diameter of the hub wheel 31 is reduced, and the outer peripheral surface of the inner ring fitting portion 3a has a cylindrical shape centered on the rotation axis a. Further, an opening hole 3b recessed in a spherical shape is formed in the center of the outer end surface of the hub wheel 31. An inner raceway surface 3d is formed on the outer periphery of the axial center portion of the hub wheel 31. Further, a wheel mounting flange 3e that extends radially outward is formed on the hub wheel 31. A plurality of bolt holes 3f are provided in the wheel mounting flange 3e about the rotation axis a, and hub bolts 33 are press-fitted into the respective bolt holes 3 f.

The inner ring 32 is externally fitted to the inner ring fitting portion 3a of the hub wheel 31. A fitting surface 3g is formed on the outer periphery of the inner end of the inner ring 32. Further, an inner raceway surface 3c is formed on the outer periphery adjacent to the fitting surface 3 g. The inner ring 32 is fixed by a fastening portion formed by expanding the tip of the inner ring fitting portion 3a in a state of being fitted to the outer ring fitting portion 3 a.

The rolling members 4, 5 are members constituting the rolling portion of the rolling bearing structure. The inner rolling member 4 includes a plurality of rolling elements 41 and a cage 42. Likewise, the outer rolling member 5 also includes a plurality of rolling elements 51 and a cage 52.

The rolling elements 41 and 51 are arranged at equal intervals in a circular shape by the cages 42 and 52, respectively. The rolling elements 41 constituting the inner rolling member 4 are interposed between the outer raceway surface 2c of the outer member 2 and the inner raceway surface 3c of the inner ring 32. The rolling elements 51 constituting the outer rolling members 5 are interposed between the outer raceway surface 2d of the outer member 2 and the inner raceway surface 3d of the hub wheel 31.

The cages 42 and 52 are circular rings in which pockets for receiving the rolling elements 41 and 51 are formed at equal intervals. The cage 42 constituting the inner rolling member 4 has spherical walls extending between the rolling elements 41 adjacent to each other and the rolling elements 41, and is held so as to sandwich one rolling element 41 between the two spherical walls. The cage 52 constituting the outer rolling member 5 has spherical walls extending between the rolling elements 51 and the rolling elements 51 adjacent to each other, and is held so that one rolling element 51 is sandwiched between the two spherical walls.

The bearing device 1 for a wheel is provided with a pair of seal members 6 for sealing both side open ends of an annular space S formed between the outer member 2 and the inner member 3 (the hub wheel 31 and the inner ring 32). Here, the description will be given focusing on the sealing member 6 fitted to the inner opening end of the annular space S.

The seal member 6 includes an oil slinger 61 and a seal ring 62. The oil slinger 61 has: a cylindrical fitting portion 61a that is externally fitted to a fitting surface 3g of the inner member 3 (inner ring 32); and a disk-shaped side plate portion 61b extending radially outward from the inner end of the fitting portion 61 a. An encoder 63 is fixed to the side plate portion 61b of the oil slinger 61. The encoder 63 is an elastic member in which magnetic poles (N pole and S pole) are alternately arranged in the circumferential direction.

On the other hand, the seal ring 62 is a member obtained by fixing the elastic member 65 to the core 64. The core 64 has: a cylindrical fitting portion 64a fitted into the fitting surface 2a of the outer member 2; and a disk-shaped side plate portion 64b extending radially inward from the outer end of the fitting portion 64 a. The elastic member 65 is formed with side lips 65a and 65b, and the respective leading edges of the side lips 65a and 65b are in contact with the side plate portions 61b of the opposed oil slingers 61. A grease lip 65c is formed in the elastic member 65, and the leading edge of the grease lip 65c contacts or approaches the fitting portion 61a of the opposing oil slinger 61.

In addition, the wheel bearing apparatus 1 includes a cover member 8 to seal the inner open end of the outer member 2 and prevent muddy water from reaching the seal member 6. Hereinafter, a structure in which the cover member 8 can be attached to the fitting cylindrical portion 2h of the outer member 2 will be described. Fig. 3 is a view showing a state in which the cover member 8 is fitted to the fitting cylindrical portion 2h of the outer member 2.

The outer member 2 has a fitting cylindrical portion (generally referred to as a guide portion) 2h formed at an inner end thereof. A cylindrical large diameter portion 2i centered on the rotation axis a of the inner member 3 is formed outside the fitting cylinder 2h, and a cylindrical small diameter portion 2j centered on the rotation axis a of the inner member 3 is formed inside the fitting cylinder 2 h. That is, the fitting cylindrical portion 2h has a cylindrical shape with different outer diameter dimensions in the axial direction (see fig. 1 and 2).

On the other hand, the cover member 8 is formed by cutting out a metal steel plate by press working and bending the metal steel plate. The cover member 8 has: a disk-shaped cover plate 81 centered on the rotation axis a of the inner member 3; and a cylindrical fitting portion 82 extending outward from a radially outer end of the cover plate portion 81 and centered on the rotation axis a. The fitting portion 82 is fitted to the small diameter portion 2j of the fitting cylindrical portion 2 h. The fitting portion 82 is slightly opened outward in the radial direction due to so-called springback. Therefore, the fitting portion 82 has a tapered shape having a spring back angle θ with respect to the axial direction. When the inner diameter of the fitting portion 82 is D1 and the outer diameter of the small diameter portion 2j is D2, the relational expression D1 ≦ D2 holds. In this way, the cover member 8 can be prevented from falling off.

Here, a structure in which the wheel bearing device 1 can be attached to a vehicle body side member (generally referred to as a knuckle) 9 will be described. Fig. 4 is a view showing a state in which the fitting cylindrical portion 2h of the outer member 2 is fitted into the fitting hole portion 9h of the vehicle body side member 9.

The wheel bearing device 1 is fixed in a state where the fitting cylindrical portion 2h of the outer member 2 is fitted into the fitting hole portion 9h of the vehicle body side member 9. Specifically, the wheel bearing device 1 is fixed to the vehicle-body side member 9 by the bolts 10 in a state where the fitting cylindrical portion 2h of the outer member 2 is fitted into the fitting hole portion 9h of the vehicle-body side member 9 and the inner end surface of the vehicle-body attachment flange 2e is brought into contact with the outer end surface of the vehicle-body side member 9. At this time, the bolt 10 is inserted from the inside through the through hole 9f of the vehicle-body side member 9 and screwed into the bolt hole 2f of the vehicle-body mounting flange 2 e. However, when the through-hole is provided in the vehicle body attachment flange 2e and the bolt hole is provided in the vehicle body side member 9, the bolt 10 is inserted from the outside through the through-hole of the vehicle body attachment flange 2e and screwed into the bolt hole of the vehicle body side member 9. The vehicle-body-side member 9 can be fixed in the same manner even if it is a motor case constituting an in-wheel motor.

Next, the features and effects of the cover member 8 of the first embodiment will be described. Fig. 5 is a diagram showing a shape of a main part of the cover member 8 of the first embodiment.

The cover member 8 of the present embodiment is characterized in that a tapered portion 83 is provided on the outer peripheral edge of the outer end of the fitting portion 82 (see fig. 3 and 5). The tapered portion 83 is a portion that is inclined at a rebound angle θ so that the inclined surface 83s thereof is reduced in diameter with respect to the fitting portion 82 that expands in diameter from the inside toward the outside due to the rebound. However, the inclination angle of the tapered portion 83 of the cover member 8 of the present embodiment is not limited to the springback angle θ, and may be an angle similar to the springback angle θ. This is because, when the fitting cylindrical portion 2h of the outer member 2 is fitted into the fitting hole 9h of the vehicle body side member 9, the fitting portion 82 of the cover member 8 need only be able to avoid interference with the inner peripheral edge of the fitting hole 9 h.

As described above, in the wheel bearing apparatus 1 including the cover member 8 according to the first embodiment, the large diameter portion 2i is formed outside the fitting cylinder portion 2h, and the small diameter portion 2j is formed inside the fitting cylinder portion 2 h. The cover member 8 is formed by bending a metal steel plate, and has a cover plate portion 81 that closes the inner open end of the outer member 2 and a fitting portion 82 that fits outside the small diameter portion 2j, and a tapered portion 83 formed based on the springback angle θ of the fitting portion 82 is provided on the outer peripheral edge of the outer end of the fitting portion 82. According to the wheel bearing device 1, when the fitting cylindrical portion 2h of the outer member 2 is fitted into the fitting hole 9h of the vehicle body side member 9, the fitting portion 82 of the cover member 8 does not interfere with the inner peripheral edge of the fitting hole 9h, and the ease of assembly of the vehicle can be improved.

Further, according to the wheel bearing device 1, unlike the structure in which the outer diameters of the small diameter portion 2j and the fitting portion 82 are designed to be small in advance so that the fitting portion 82 does not interfere with the inner peripheral edge of the fitting hole portion 9h, the strength of the fitting cylindrical portion 2h is not reduced.

Next, the features and effects of the cover member 8 of the second embodiment will be described. Fig. 6 is a diagram showing a shape of a main part of the cover member 8 of the second embodiment.

The cover member 8 of the present embodiment is also provided with a tapered portion 83. The tapered portion 83 is a portion inclined at a predetermined angle so that the inclined surface 83s is reduced in diameter with respect to the outer peripheral surface 82s of the fitting portion 82 whose diameter is increased from the inside toward the outside. Here, when the angle of the outer peripheral surface 82s of the fitting portion 82 with respect to the rotation axis a of the inner member 3 is R1, and the angle of the inclined surface 83s of the tapered portion 83 with respect to the outer peripheral surface 82s of the fitting portion 82 is R2, the relational expression R1 ≦ R2 holds. It is apparent that the axial length L of the inclined surface 83s is set longer than the position where the fitting portion 82 of the cover member 8 interferes with the inner periphery of the fitting hole 9 h.

As described above, in the wheel support bearing device 1 including the cover member 8 according to the second embodiment, the relational expression R1 ≦ R2 is satisfied when the angle of the outer peripheral surface 82s of the fitting portion 82 with respect to the rotation axis a of the inner member 3 is R1, and the angle of the inclined surface 83s of the tapered portion 83 with respect to the outer peripheral surface 82s of the fitting portion 82 is R2. According to the wheel bearing device 1, the fitting portion 82 of the cover member 8 can be reliably prevented from interfering with the inner peripheral edge of the fitting hole 9 h. Therefore, the assembling property of the automobile can be further improved.

Next, the features and effects of the cover member 8 of the third embodiment will be described. However, only the portions different from the cover member 8 of the second embodiment will be described. Fig. 7 is a diagram showing a shape of a main part of a cover member 8 of the third embodiment.

In the present embodiment, the relation R1 ≦ R2 is satisfied when the angle of the outer peripheral surface 82s of the fitting portion 82 with respect to the rotation axis a of the inner member 3 is R1 and the angle of the inclined surface 83s of the tapered portion 83 with respect to the outer peripheral surface 82s of the fitting portion 82 is R2. When the above-described relational expression D1 ≦ D2 is satisfied, although the fitting portion 82 is further opened to the radially outer side when the cover member 8 is assembled, the relational expression D3 ≦ D4 is satisfied when the outer diameter of the fitting portion 82 is D3 and the outer diameter of the large diameter portion 2i is D4.

As described above, in the wheel support bearing device 1 including the cover member 8 according to the third embodiment, when the inner diameter of the fitting portion 82 is D1, the outer diameter of the small diameter portion 2j is D2, the outer diameter of the fitting portion 82 is D3, and the outer diameter of the large diameter portion 2i is D4, the relational expression D1 ≦ D2 and the relational expression D3 ≦ D4 are satisfied. According to the wheel bearing device 1, even if the fitting portion 82 is strongly pressed into the small diameter portion 2j to prevent the fitting portion from coming off, the fitting portion 82 of the cover member 8 can be reliably prevented from interfering with the inner peripheral edge of the fitting hole portion 9 h. Therefore, the cover member 8 can be prevented from falling off, and the assembling property of the automobile can be further improved.

Next, other features and effects of the cover member 8 of each embodiment will be described.

The cover member 8 of each embodiment is provided with two holes at predetermined positions of the cover plate portion 81. A hole on the outer side in the radial direction is provided in a portion of the cover plate 81 facing the encoder 63, and a sensor 7 (see fig. 1 to 7) for detecting magnetism of the encoder 63 is inserted into the hole. Further, the bolt 74 for fixing the sensor 7 is inserted through a hole on the radially inner side and screwed into a nut 84 welded to the cover plate portion 81 (see fig. 2 and 3). In this way, the cover member 8 of each embodiment can support the sensor 7. In the cover member 8 of each embodiment, since the fitting portion 82 does not interfere with the fitting hole 9h, strain is not transmitted from the fitting portion 82 to the cover plate 81.

As described above, the wheel bearing device 1 including the cover member 8 according to the present embodiment includes: an encoder 63 that rotates integrally with the inner member 3; and a sensor 7 that is close to the encoder 63 and detects magnetism of the encoder 63. The cover member 8 supports the sensor 7. According to the wheel bearing device 1, since no strain is generated in the cover plate portion 81 of the cover member 8, the gap between the encoder 63 and the sensor 7 is not varied.

Industrial applicability

The present invention can be used for a wheel bearing device.

Description of reference numerals:

1 bearing device for wheel

2 outer member, 2c outer raceway surface, 2d outer raceway surface, 2h fitting cylindrical portion, 2i large diameter portion, 2j small diameter portion

3 inner member, 31 hub ring, 32 inner ring, 3c inner raceway surface, and 3d inner raceway surface

4 rolling element

5 Rolling component

6 sealing Member, 63 encoder

7 sensor

8 cover member, 81 cover plate portion, 82 fitting portion, 83 taper-processed portion

9 vehicle body side member, 9h fitting hole portion

Rotating shaft of A inner member

Theta rebound Angle

Angle of outer peripheral surface of R1 fitting part with respect to rotation axis of inner member

Angle of inclined surface of tapered portion of R2 with respect to outer peripheral surface of fitting portion

Inner diameter of D1 fitting part

Outer diameter of D2 minor diameter part

Outer diameter of D3 fitting part

D4 outside diameter of the large diameter portion.