JP2020143699A - Bearing device for wheel - Google Patents

Abstract

To provide a bearing device for a wheel capable of sufficiently suppressing degradation of circularity of a raceway surface in an outer member.SOLUTION: In a bearing device 1 for a wheel which includes an outer ring 2 having a vehicle body mounting flange 2e on an outer periphery, an inner member having a hub ring 3 and an inner ring 4, and double-row ball rows 5, 6 rollably housed between both raceway surfaces of the outer ring 2 and the inner member, and in which a plurality of bolt holes 2g are formed on the vehicle body mounting flange 2e along a circumferential direction, the vehicle body mounting flange 2e is provided with a relief groove 2n formed on a boundary portion of a basic end portion of an inner side face 2m of the vehicle body mounting flange 2e and an outer peripheral surface 2o of the outer ring 2, and a first recessed groove 2p formed along the circumferential direction at an outer diameter side of the relief groove 2n on the inner side face 2m of the vehicle body mounting flange 2e and an inner diameter side with respect to the bolt holes 2g, and recessed to an outer side with respect to the inner side face 2m of the vehicle body mounting flange 2e, and a depth H2 of the first recessed groove 2p is shallower than a depth H1 of the relief groove 2n.SELECTED DRAWING: Figure 3

Description

The present invention relates to a wheel bearing device.

Conventionally, a wheel bearing device that rotatably supports a wheel in a suspension device such as an automobile has been known. The outer member of the wheel bearing device has a vehicle body mounting flange, and the vehicle body mounting flange is fixed to the suspension device with bolts.

The mating component to which the outer member is attached may have irregularities on the outer side surface on the side to which the outer member is attached. For example, if the inner diameter side of the outer side surface of the mating part is formed so as to protrude toward the outer diameter side from the outer diameter side, the car body mounting flange is on the mating part side when the vehicle body mounting flange is bolted to the mating part. In some cases, it was deformed so as to fall down, and the roundness of the raceway surface of the rolling element formed on the outer member was deteriorated.

Therefore, in the conventional wheel bearing device, a concave groove is formed along the circumferential direction at the base end portion on the inner side surface of the vehicle body mounting flange, and the contact area between the inner side surface of the vehicle body mounting flange and the outer side surface of the mating component. Is reduced to reduce the influence on the outer member even if the outer side surface of the mating part is uneven, and the deterioration of the roundness of the raceway surface of the outer member is suppressed (). For example, see Patent Document 1). The concave groove of the vehicle body mounting flange described in Patent Document 1 is configured to form a flat portion from the deepest portion to the outer diameter side end portion so that the contact area between the vehicle body mounting flange and the mating component becomes smaller. There is.

Japanese Unexamined Patent Publication No. 2012-228909

When a flat portion is formed from the deepest portion to the outer diameter side end portion like the concave groove of the vehicle body mounting flange described in Patent Document 1 described above, a notch at the base end portion of the vehicle body mounting flange when forming the concave groove is formed. In some cases, the amount becomes large and the rigidity of the vehicle body mounting flange decreases, so that deformation of the vehicle body mounting flange cannot be sufficiently suppressed.

Therefore, in the present invention, when the outer side surface of the mating component to which the vehicle body mounting flange is attached is uneven, the deformation of the vehicle body mounting flange is sufficiently suppressed, and the roundness of the raceway surface of the outer member is sufficiently deteriorated. It is an object of the present invention to provide a bearing device for wheels that can be suppressed.

That is, the first invention is an outer member having a vehicle body mounting flange on the outer circumference and a double row of outer raceway surfaces on the inner circumference, a hub ring having a small diameter step portion extending in the axial direction on the outer circumference, and the hub. An inner member composed of at least one inner ring press-fitted into a small-diameter step portion of the ring and having a double-row inner raceway surface facing the outer raceway surface of the double-row, and the outer member and the inner member. A double-row rolling element that is rotatably housed between both raceway surfaces is provided, and a plurality of bolt holes through which bolts for fastening to a vehicle body side member are inserted are provided in the vehicle body mounting flange in the circumferential direction. It is a bearing device for wheels formed along the same, and the vehicle body mounting flange is provided along the circumferential direction at the boundary between the base end portion on the inner side surface of the vehicle body mounting flange and the outer peripheral surface of the outer member. The formed slime groove and the outer diameter side of the slime groove on the inner side surface of the vehicle body mounting flange and the inner diameter side of the bolt hole are formed along the circumferential direction and are on the outer side of the inner side surface of the vehicle body mounting flange. The wheel bearing device is provided with a recessed first concave groove, and the depth of the first concave groove is shallower than the depth of the hollow groove.

The second invention is a wheel bearing device having a forged surface on the surface of the first concave groove.

A third invention is a wheel bearing device in which the vehicle body mounting flange is provided with a second concave groove formed along an outer peripheral edge portion on an inner side surface of the vehicle body mounting flange.

A fourth invention is a wheel bearing device in which at least one of the first concave groove and the second concave groove is formed in a part of the circumferential direction on the inner side surface of the vehicle body mounting flange.

As the effect of the present invention, the following effects are exhibited.

That is, according to the first invention, the amount of notch at the base end portion of the vehicle body mounting flange can be suppressed to a small size. As a result, deformation of the vehicle body mounting flange can be sufficiently suppressed when the outer side surface of the mating component to which the vehicle body mounting flange is mounted is uneven, and the deterioration of the roundness of the outer raceway surface of the outer member is sufficient. Can be suppressed.

According to the second invention, it is possible to omit the machining for forming the first concave groove with respect to the inner side surface of the vehicle body mounting flange, and it is possible to reduce the man-hours for manufacturing the outer member.

According to the third invention, it is possible to suppress the deformation of the vehicle body mounting flange when the vehicle body mounting flange and the mating component are fixed.

According to the fourth invention, the notch amount of the vehicle body mounting flange at the portion where the first concave groove and the second concave groove are formed in a part of the circumferential direction can be suppressed to a smaller size, and the vehicle body mounting flange can be suppressed. It is possible to further suppress the decrease in the rigidity of the vehicle body and sufficiently suppress the deformation of the vehicle body mounting flange.

A side sectional view showing a bearing device for wheels. The front view which shows the bearing device for a wheel. Side sectional view showing a vehicle body mounting flange fastened to a knuckle with bolts. A side sectional view showing a comparative example of a state in which a vehicle body mounting flange on which the first concave groove is not formed is fastened to a knuckle by a bolt. A side sectional view showing a vehicle body mounting flange in which a first concave groove and a second concave groove are formed on the inner diameter side and the outer diameter side of the bolt hole. The front view which shows the vehicle body mounting flange which formed the 1st concave groove and the 2nd concave groove on the inner diameter side and the outer diameter side of a bolt hole. The front view which shows the bearing device for a wheel which the 1st concave groove and the 2nd concave groove were formed in a part region in the circumferential direction of a vehicle body mounting flange.

Hereinafter, the wheel bearing device 1 which is the first embodiment of the wheel bearing device according to the present invention will be described with reference to FIGS. 1 and 2.

The wheel bearing device 1 shown in FIG. 1 rotatably supports wheels in a suspension device for a vehicle such as an automobile. The wheel bearing device 1 includes an outer ring 2 which is an outer member, a hub ring 3 and an inner ring 4 which are inner members, two rows of inner ball rows 5 and outer side ball rows 6 which are rolling rows. It includes an inner side sealing member 9 and an outer side sealing member 10. Here, the inner side represents the vehicle body side of the wheel bearing device 1 when attached to the vehicle body, and the outer side represents the wheel side of the wheel bearing device 1 when attached to the vehicle body. Further, the axial direction represents a direction along the rotation axis of the wheel bearing device 1.

An inner side opening 2a into which the inner side sealing member 9 can be fitted is formed at the inner side end of the outer ring 2. An outer side opening 2b into which the outer side seal member 10 can be fitted is formed at the outer side end of the outer ring 2. An outer raceway surface 2c on the inner side and an outer raceway surface 2d on the outer side are formed on the inner peripheral surface of the outer ring 2. A vehicle body mounting flange 2e for attaching the outer ring 2 to a vehicle body side member (knuckle or parking plate) is integrally formed on the outer peripheral surface 2o of the outer ring 2. The vehicle body mounting flange 2e is provided with a bolt hole 2g through which a fastening member (here, the bolt 12 shown in FIG. 3) for fastening the member on the vehicle body side and the outer ring 2 is inserted.

A small diameter step portion 3a having a diameter smaller than that of the outer side end portion is formed on the outer peripheral surface of the inner side end portion of the hub ring 3. A wheel mounting flange 3b for mounting a wheel is integrally formed at the outer end of the hub wheel 3. The wheel mounting flange 3b is provided with a bolt hole 3f into which a hub bolt for fastening the hub wheel 3 and the wheel is press-fitted.

The hub ring 3 is provided with an inner raceway surface 3c on the outer side so as to face the outer raceway surface 2d on the outer side of the outer ring 2. Further, in the hub wheel 3, a lip sliding surface 3d to which the outer side sealing member 10 slides is formed on the base side of the wheel mounting flange 3b. An inner ring 4 is provided on the small diameter step portion 3a of the hub ring 3.

An inner raceway surface 4a is formed on the outer peripheral surface of the inner ring 4. The inner ring 4 is fixed to the small diameter step portion 3a of the hub ring 3 by press fitting and crimping. That is, on the inner side of the hub ring 3, the inner raceway surface 4a is formed by the inner ring 4. The inner raceway surface 4a of the inner ring 4 faces the outer raceway surface 2c on the inner side of the outer ring 2.

The inner side ball row 5 and the outer side ball row 6 which are rolling rows are configured by holding a plurality of balls 7 which are rolling bodies by a cage 8. The inner ball row 5 is rotatably sandwiched between the inner raceway surface 4a of the inner ring 4 and the outer raceway surface 2c on the inner side of the outer ring 2. The outer ball row 6 is rotatably sandwiched between the inner raceway surface 3c of the hub ring 3 and the outer raceway surface 2d on the outer side of the outer ring 2.

In the wheel bearing device 1, a double row angular contact ball bearing is composed of an outer ring 2, a hub ring 3, an inner ring 4, an inner ball row 5, and an outer ball row 6. The wheel bearing device 1 may be composed of double row conical roller bearings.

As shown in FIG. 2, the vehicle body mounting flange 2e is formed with a protruding portion 2f protruding radially outward from the outer peripheral surface 2o of the outer ring 2. Four projecting portions 2f are provided on the vehicle body mounting flange 2e. Bolt holes 2g are formed in each protrusion 2f. The bolt holes 2g are arranged on a pitch circle P centered on the central axis of the outer ring 2.

Two bolt holes 2g are arranged so as to be orthogonal to the central axis of the outer ring 2 and to sandwich a reference line B passing through the center C of the pitch circle P. Further, the bolt holes 2g are arranged two by two with a symmetry axis S which is a straight line passing through the center C of the pitch circle P orthogonal to the reference line B. That is, in the vehicle body mounting flange 2e, when the reference line B is the X axis and the symmetry axis S is the Y axis, the bolt holes 2g are arranged at positions corresponding to each quadrant on the XY plane.

The acute angle side of the angle formed by the straight line passing through the center of the bolt hole 2g arranged in the first quadrant Q1 in the XY plane and the center C of the pitch circle P with the reference line B is arranged in the first quadrant Q1. Let the first phase angle θ1 be the phase angle of the bolt hole 2g. Similarly, the phase angle of the bolt hole 2g arranged in the second quadrant Q2 on the XY plane is the second phase angle θ2, and the phase angle of the bolt hole 2g arranged in the third quadrant Q3 is the third phase angle θ3. The phase angle of the bolt hole 2g arranged in the fourth quadrant Q4 is defined as the fourth phase angle θ4. Each bolt hole 2g is arranged so as to be line-symmetrical with the Y axis, which is the axis of symmetry S, as the axis of symmetry. It is equal to the fourth phase angle θ4.

A slime groove 2n is formed along the circumferential direction at the boundary between the base end portion of the inner side surface 2m of the vehicle body mounting flange 2e and the outer peripheral surface 2o of the outer ring 2. The slime groove 2n is formed over the entire circumference of the vehicle body mounting flange 2e in the circumferential direction. The slime groove 2n is a groove that is recessed toward the outer side of the inner side surface 2m and is recessed toward the inner diameter side of the outer peripheral surface 2o of the outer ring 2. The depth of the slime groove 2n in the axial direction is H1 (see FIG. 3).

By forming the slime groove 2n, when the vehicle body mounting flange 2e is attached to the vehicle body side member (here, the knuckle) 11, the base end portion of the vehicle body mounting flange 2e on the inner side surface 2m and the outer peripheral surface 2o of the outer ring 2 The boundary portion does not interfere with the knuckle 11, and the vehicle body mounting flange 2e can be mounted on the knuckle 11 with high accuracy.

A first concave groove 2p recessed toward the outer side of the inner side surface 2m is formed on the inner side surface 2m of the vehicle body mounting flange 2e along the circumferential direction. The first concave groove 2p is arranged on the outer diameter side of the slime groove 2n and on the inner diameter side of the bolt hole 2g. The first concave groove 2p is continuously formed from the outer diameter side end portion of the slime groove 2n toward the outer diameter side. The first concave groove 2p is formed over the entire circumference of the vehicle body mounting flange 2e in the circumferential direction. The depth of the first concave groove 2p in the axial direction is H2, and the depth H2 of the first concave groove 2p is formed to be shallower than the depth H1 of the slime groove 2n. The bottom surface of the first concave groove 2p has a flat surface.

In the wheel bearing device 1 configured as described above, for example, as shown in FIG. 3, the bolt 12 is inserted into the insertion hole 11a of the knuckle 11 and fastened to the bolt hole 2g of the vehicle body mounting flange 2e. The vehicle body mounting flange 2e is mounted on the knuckle 11.

When the vehicle body mounting flange 2e is attached to the knuckle 11, the outer side surface 11b of the knuckle 11 that comes into contact with the inner side surface 2m of the vehicle body mounting flange 2e may have irregularities. For example, as shown in FIG. 4, the outer side surface 11b of the knuckle 11 may have irregularities having an inner diameter side protruding toward the outer diameter side rather than the outer diameter side.

In such a case, the protruding portion 11c protruding toward the outer side of the outer side surface 11b of the knuckle 11 abuts on the inner side portion of the inner side surface 2m of the vehicle body mounting flange 2e with respect to the bolt hole 2g, and is outside the protruding portion 11c. On the radial side, a gap G is formed between the inner side surface 2m of the vehicle body mounting flange 2e and the outer side surface 11b of the knuckle 11. Since the gap G is formed not only on the outer diameter side of the bolt hole 2g but also on the inner diameter side of the bolt hole 2g, when the vehicle body mounting flange 2e and the knuckle 11 are fastened with the bolt 12, the gap G is formed. The vehicle body mounting flange 2e is easily deformed so as to fall toward the inner side with the portion in contact with the protruding portion 11c as a fulcrum.

However, when the first concave groove 2p is formed in the vehicle body mounting flange 2e as in the present embodiment, as shown in FIG. 3, the protruding portion 11c of the knuckle 11 fits into the first concave groove 2p and the vehicle body. It does not come into contact with the inner side surface 2m of the mounting flange 2e. In this case, the portion between the bolt hole 2g and the first concave groove 2p on the inner side surface 2m of the vehicle body mounting flange 2e comes into contact with the outer side surface 11b of the knuckle 11, and there is almost a gap in the portion on the inner diameter side of the bolt hole 2g. Since G is not formed, when the vehicle body mounting flange 2e and the knuckle 11 are fastened with the bolt 12, the vehicle body mounting flange 2e is prevented from being deformed so as to fall toward the inner side. The radial dimension of the first concave groove 2p can be appropriately set depending on the size and shape of the protruding portion 11c of the knuckle 11.

Here, the amount of protrusion of the protruding portion 11c of the knuckle 11 in the axial direction, that is, the size of the unevenness of the outer side surface 11b of the knuckle 11 in the axial direction is not so large as about several tens of μm, and is formed on the vehicle body mounting flange 2e. Since the depth H2 of the first concave groove 2p does not need to be so deep, the depth H2 of the first concave groove 2p is formed shallower than the depth H1 of the knuckle groove 2n. Therefore, when the first concave groove 2p is formed at the base end portion of the vehicle body mounting flange 2e, the amount of notch at the base end portion of the vehicle body mounting flange 2e can be suppressed to a small size, and the decrease in rigidity of the vehicle body mounting flange 2e is suppressed. Therefore, it is possible to sufficiently suppress the deformation of the vehicle body mounting flange 2e. As a result, deterioration of the roundness of the outer raceway surface 2c and the outer raceway surface 2d in the outer ring 2 can be sufficiently suppressed.

Further, as shown in FIGS. 5 and 6, in the inner side surface 2m of the vehicle body mounting flange 2e, a second concave groove 2q recessed toward the outer side of the inner side surface 2m is provided along the outer peripheral edge portion of the vehicle body mounting flange 2e. Can be formed. That is, the first concave groove 2p is provided on the outer diameter side of the slime groove 2n on the inner side surface 2m of the vehicle body mounting flange 2e and on the inner diameter side of the bolt hole 2g, and along the outer peripheral edge portion on the inner side surface 2m of the vehicle body mounting flange 2e. The second concave groove 2q can be provided. In this way, by forming the second concave groove 2q along the outer peripheral edge portion of the inner side surface 2m of the vehicle body mounting flange 2e, the portion where the bolt hole 2g of the vehicle body mounting flange 2e is formed is shown in FIG. As described above, the second concave groove 2q is arranged on the outer diameter side of the bolt hole 2g.

The second concave groove 2q arranged along the outer peripheral edge portion of the vehicle body mounting flange 2e is formed over the entire circumference of the vehicle body mounting flange 2e in the circumferential direction. Further, the depth H3 of the second concave groove 2q is formed to be shallower than the depth H1 of the slime groove 2n. The depth H3 can be formed at the same depth as the depth H2 of the first concave groove 2p, for example.

In this way, in the portion where the bolt hole 2g of the vehicle body mounting flange 2e is formed, the second concave groove 2q is arranged on the outer diameter side of the bolt hole 2g of the inner side surface 2m, as shown in FIG. When the outer side surface 11b of the knuckle 11 has irregularities having a shape in which the outer diameter side protrudes toward the outer diameter side from the inner diameter side, the protruding portion 11c on the outer diameter side fits into the second concave groove 2q and the vehicle body. It does not come into contact with the inner side surface 2m of the mounting flange 2e.

As a result, the portion between the bolt hole 2g on the inner side surface 2m of the vehicle body mounting flange 2e and the second concave groove 2q on the outer diameter side of the bolt hole 2g comes into contact with the outer side surface 11b of the knuckle 11 and from the bolt hole 2g. Since a gap G is hardly formed in the portion on the outer diameter side, the same effect as that of the above-described embodiment is obtained.

The first concave groove 2p and the second concave groove 2q can be arranged on both the inner diameter side and the outer diameter side of the bolt hole 2g, but the inner diameter side and the outer diameter side of the bolt hole 2g It is also possible to arrange it in only one of them. For example, the uneven shape of the outer side surface 11b of the knuckle 11 is determined to be either a shape in which the inner diameter side protrudes toward the outer diameter side rather than the outer diameter side, or a shape in which the outer diameter side protrudes toward the outer diameter side from the inner diameter side. When present, the first concave groove 2p and the second concave groove 2q can be arranged only on the necessary side of the inner diameter side and the outer diameter side of the bolt hole 2g.

Further, the first concave groove 2p and the second concave groove 2q can be formed by forming the outer ring 2 by forging and then performing machining such as cutting on the inner side surface 2m of the vehicle body mounting flange 2e. However, it is also possible to form the shapes of the first concave groove 2p and the second concave groove 2q by the mold when the outer ring 2 is forged. When the first concave groove 2p and the second concave groove 2q are formed by forging in this way, the first concave groove 2p and the second concave groove 2q are not machined after forging, so that the first concave groove 2p And the surface of the second concave groove 2q remains in a state of having a forged skin. That is, when the first concave groove 2p and the second concave groove 2q having the forged surface are formed on the inner side surface 2m of the vehicle body mounting flange 2e, the first concave groove 2p and the second concave groove 2q are formed with respect to the inner side surface 2m. Since the machining for the outer ring 2 can be omitted, the man-hours for manufacturing the outer ring 2 can be reduced.

As shown in FIG. 7, the first concave groove 2p and the second concave groove 2q can also be formed in a part of the circumferential direction of the inner side surface 2m of the vehicle body mounting flange 2g.

When the first concave groove 2p is formed in a part of the circumferential direction, the first concave groove 2p is preferably arranged in a phase corresponding to the phase in which the bolt holes 2g are arranged in the circumferential direction. In FIG. 7, the first concave groove 2p is arranged at each of the four phases corresponding to the four bolt holes 2g. When the second concave groove 2q is formed in a part of the circumferential direction, the second concave groove 2q is preferably arranged at a position where the protruding portion 2f of the vehicle body mounting flange 2e is formed. In FIG. 7, the second concave groove 2q is arranged at a position corresponding to the four protruding portions 2f of the vehicle body mounting flange 2e.

When the vehicle body mounting flange 2e and the knuckle 11 are fastened with the bolt 12, the vehicle body mounting flange 2e and the knuckle 11 are pressed together with the largest force in the phase in which the bolt holes 2g are arranged, so that the bolt holes 2g are arranged. By arranging the first concave groove 2p and the second concave groove 2q along the inner diameter side of the phase and the outer peripheral edge of the protruding portion 2f where the bolt hole 2g is formed, the vehicle body formed by the protruding portion 11c of the knuckle 11 The influence on the mounting flange 2e can be effectively suppressed.

Further, it is preferable that the length W in the circumferential direction of the first concave groove 2p arranged on the inner diameter side of the bolt hole 2g is at least the same as the length in the circumferential direction of the vehicle body mounting flange 2e. When the vehicle body mounting flange 2e and the knuckle 11 are fastened with the bolt 12, a force is applied in the direction in which the vehicle body mounting flange 2e and the knuckle 11 are in pressure contact with each other from the head formed having a diameter larger than the screw portion of the bolt 12. Therefore, by providing the first concave groove 2p for at least the length of the vehicle body mounting flange 2e in the circumferential direction, the first concave groove 2p can be arranged in a range where the force is received from the head of the bolt 12, and the knuckle can be arranged. The influence of the protruding portion 11c of 11 on the vehicle body mounting flange 2e can be suppressed more effectively.

Further, by locally forming the first concave groove 2p in a part of the circumferential direction of the inner side surface 2m of the vehicle body mounting flange 2g, the first concave groove 2p is formed at the base end portion of the vehicle body mounting flange 2e. At that time, the amount of notch at the base end of the vehicle body mounting flange 2e can be suppressed to be smaller, the decrease in rigidity of the vehicle body mounting flange 2e can be further suppressed, and the deformation of the vehicle body mounting flange 2e can be sufficiently suppressed. It becomes. Further, by locally forming the second concave groove 2q arranged along the outer peripheral edge portion of the inner side surface 2 m in a part of the circumferential direction, the amount of notch in the outer peripheral edge portion of the vehicle body mounting flange 2e can be further increased. It can be kept small, the decrease in rigidity of the vehicle body mounting flange 2e can be further suppressed, and the deformation of the vehicle body mounting flange 2e can be sufficiently suppressed.

In the present embodiment, the vehicle body mounting flange 2e is directly fastened to the knuckle 1, but it may be fastened with a plate-shaped member such as a parking plate sandwiched between the vehicle body mounting flange 2e and the knuckle 1. .. In this case, the inner side surface 2m of the vehicle body mounting flange 2e comes into contact with a plate-shaped member such as a parking plate. Plate-shaped members such as parking plates are often formed by press working, and often have irregularities on the contact surface with the vehicle body mounting flange 2e due to press working.

Therefore, even when the vehicle body mounting flange 2e is fastened with a plate-shaped member such as a parking plate sandwiched between the vehicle body mounting flange 2e, the first concave groove 2p and the second concave groove are formed on the inner side surface 2m of the vehicle body mounting flange 2e. By forming 2q, the influence of the unevenness of the plate-shaped member on the vehicle body mounting flange 2e can be reduced, and the deformation of the vehicle body mounting flange 2e can be effectively suppressed.

The wheel bearing device 1 in the present embodiment is configured as a wheel bearing device 1 having a third generation structure in which an inner raceway surface 3c is directly formed on the outer periphery of the hub wheel 3, but the present invention is limited to this. Instead, it may have a second-generation structure in which a pair of inner rings 4 are press-fitted and fixed to the hub wheels 3.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, but is merely an example, and is further various as long as it does not deviate from the gist of the present invention. Of course, the scope of the present invention is indicated by the description of the scope of claims, and the equal meaning described in the scope of claims, and all changes within the scope of the claims are made. Including.

1 Wheel bearing device 2 Outer ring 2c (inner side) outer raceway surface 2d (outer side) outer raceway surface 2e Vehicle body mounting flange 2f Protruding part 2g Bolt hole 2m Inner side surface 2n Nude groove 2o Outer outer surface 2p First concave groove 2q 2nd concave groove 3 Hub wheel 3a Small diameter step 3c Inner raceway surface 4 Inner ring 4a Inner raceway surface 5 Inner side ball row 6 Outer side ball row 11 Body side member H1 (of the slime groove) Depth H2 (of the 1st concave groove) ) Depth H3 (of the second groove) Depth

Claims (4)

An outer member having a vehicle body mounting flange on the outer circumference and a double row of outer raceway surfaces on the inner circumference.
A hub ring having a small diameter step portion extending in the axial direction on the outer circumference, and at least one inner ring press-fitted into the small diameter step portion of the hub ring, and the inner raceway surface of the double row facing the outer raceway surface of the double row. The inner member to have and
A double-row rolling element that is rotatably housed between both raceway surfaces of the outer member and the inner member is provided.
A wheel bearing device in which a plurality of bolt holes through which bolts for fastening to a vehicle body side member are inserted are formed in the vehicle body mounting flange along the circumferential direction.
The vehicle body mounting flange
A slime groove formed along the circumferential direction at the boundary between the base end portion on the inner side surface of the vehicle body mounting flange and the outer peripheral surface of the outer member.
A first concave groove formed along the circumferential direction on the outer diameter side of the hollow groove on the inner side surface of the vehicle body mounting flange and on the inner diameter side of the bolt hole, and is recessed on the outer diameter side of the inner side surface of the vehicle body mounting flange. And are provided,
A wheel bearing device characterized in that the depth of the first concave groove is shallower than the depth of the hollow groove. The wheel bearing device according to claim 1, wherein the surface of the first concave groove has a forged surface. The wheel bearing device according to claim 1 or 2, wherein the vehicle body mounting flange is provided with a second concave groove formed along an outer peripheral edge portion on an inner side surface of the vehicle body mounting flange. The wheel bearing device according to claim 3, wherein at least one of the first concave groove and the second concave groove is formed in a partial region in the circumferential direction on the inner side surface of the vehicle body mounting flange.

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