JP2022093009A - Hub unit bearing and method for manufacturing the same - Google Patents

Abstract

To provide a hub unit bearing that can strike a balance between weight reduction and rigidity improvement.SOLUTION: A hub unit bearing 1 includes: a flange plate 50 connected to an outer peripheral surface (outer peripheral surface 36 of shank 35) of an inner member 20 and extending in a radial direction; and an annular member 60 connected to an outer peripheral surface 52D of the flange plate 50. The flange plate 50 has a wave shape in which an inside projection part 51 projecting on an axial inside and an outside projection part 52 projecting on an axial outside are alternately formed in a circumferential direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to a hub unit bearing and a method for manufacturing the same.

Since the hub unit bearing affects the unsprung weight, weight reduction and low rotational inertia are required to improve the ride quality and fuel efficiency of the vehicle, but from the viewpoint of improving maneuverability, it is highly rigid. It is also required to be.

In the rolling bearing unit described in Patent Document 1, a flange portion facing outward in the radial direction is provided on the inner shaft portion. Through holes are provided at a plurality of locations in the circumferential direction of the flange portion. A hub bolt is inserted into this through hole, and the flange portion and the disc rotor are fixed. A thick rib portion is formed on the flange portion along a virtual circumferential line centered on the axis and passing over a plurality of through holes. Further, in the flange portion, a thick portion is formed around the through hole. In this way, the thick rib portion and the thick portion are provided in the portion to which a large stress is applied, while the other portion is a thin portion to reduce the mass and rotational inertia of the hub wheel which is a rotating component. I am trying to.

Japanese Unexamined Patent Publication No. 2006-143073

However, in the rolling bearing unit of Patent Document 1, since the thick portion and the thick rib of the flange portion have a solid structure, the effect of reducing the mass and the rotational inertia is not sufficient.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hub unit bearing that can achieve both weight reduction and rigidity improvement.

The above object of the present invention is achieved by the following configuration.
(1) An outer member having a double row of rolling surfaces formed on the inner peripheral surface, and an outer member.
An inner member having multiple rows of rolling surfaces formed on the outer peripheral surface,
A plurality of rolling elements arranged between the double row rolling surface of the outer member and the double row rolling surface of the inner member.
In hub unit bearings
A flange plate connected to the outer peripheral surface of the outer member or the inner member and extending in the radial direction,
An annular member connected to the outer peripheral surface of the flange plate and
Equipped with
The flange plate has a waveform in which an inward convex portion protruding inward in the axial direction and an outer convex portion protruding outward in the axial direction are alternately formed in the circumferential direction.
Hub unit bearing.
(2) The hub unit bearing according to (1), wherein a fastening member provided with a bolt hole for inserting a hub bolt is fixed to the flange plate.
(3) The hub unit bearing according to (1) or (2), wherein a reinforcing plate is welded to the axial inner surface or the axial outer surface of the flange plate.
(4) An outer member having multiple rows of rolling surfaces formed on the inner peripheral surface, and an outer member.
An inner member having multiple rows of rolling surfaces formed on the outer peripheral surface,
A plurality of rolling elements arranged between the double row rolling surface of the outer member and the double row rolling surface of the inner member.
It is a manufacturing method of a hub unit bearing provided with
The flange plate is formed into a corrugation in which an inward convex portion protruding inward in the axial direction and an outer convex portion protruding outward in the axial direction are alternately formed in the circumferential direction by press molding.
The entire circumference of the inner peripheral surface of the flange plate is welded to the entire circumference of the outer member or the outer peripheral surface of the inner member.
An annular member is arranged on the radial outer side of the flange plate.
The entire circumference of the outer peripheral surface of the flange plate is welded to the entire circumference of the inner peripheral surface of the annular member.
The axial outer surface of the flange plate, the portion of the outer peripheral surface of the outer member or the inner member that is axially outer of the axial outer surface of the flange plate, and the axial outer surface of the annular member. , How to manufacture hub unit bearings for finishing.

According to the present invention, it is possible to provide a hub unit bearing that can achieve both weight reduction and rigidity improvement.

It is sectional drawing which shows the hub unit bearing which concerns on 1st Embodiment. It is a figure which looked at the flange plate and the annular member of 1st Embodiment from the inner side (the inside in the axial direction). FIG. 2 is a cross-sectional view taken along the line III-III of FIG. It is sectional drawing which shows the state which fixed the 1st reinforcing plate to the flange plate which concerns on 2nd Embodiment. It is sectional drawing which shows the state which fixed the 2nd reinforcing plate to the flange plate which concerns on 3rd Embodiment. It is sectional drawing which shows the state which fixed the 1st reinforcing plate and the 2nd reinforcing plate to the flange plate which concerns on 4th Embodiment. It is a figure which looked at the flange plate and the annular member which concerns on 4th Embodiment from the inner side (inside in the axial direction). It is sectional drawing which shows the hub unit bearing which concerns on 5th Embodiment.

Hereinafter, the hub unit bearing 1 of each embodiment of the present invention will be described with reference to the drawings.

(First Embodiment)
FIG. 1 is a cross-sectional view showing a hub unit bearing 1 according to the first embodiment.

The hub unit bearing 1 rotatably supports wheels (driving wheels or driven wheels) on a vehicle body. The hub unit bearing 1 includes an outer member 10 having a double-row rolling surface 11a, 11b formed on the inner peripheral surface, and an inner member 20 having a double-row rolling surface 21a, 21b formed on the outer peripheral surface. , A plurality of rolling elements 3 arranged between the double-row rolling surfaces 11a and 11b of the outer member 10 and the double-row rolling surfaces 21a and 21b of the inner member 20 and a plurality of rolling elements 3. It is provided with a cage 4 that is rotatably held.

In the present specification, the "inside in the axial direction (one side in the axial direction)" and the "inner side" represent the vehicle body side of the hub unit bearing 1 when attached to the vehicle body, and are the right side in FIG. The "outside in the axial direction (the other side in the axial direction)" and the "outer side" represent the wheel side of the hub unit bearing 1 when attached to the vehicle body, and are the left side in FIG. Further, the "diametrically outer side" represents a direction away from the rotation axis O of the inner member 20, and is the upper side in FIG. The “diameter inside” represents a direction in which the inner member 20 approaches the rotation axis O, and is the lower side in FIG. The "circumferential direction" represents a direction in which the inner member 20 turns around the rotation axis O.

The outer member 10 constitutes an outer ring having a rolling bearing structure. Two rows of rolling surfaces 11a and 11b are formed on the inner peripheral surface of the outer member 10. The two rows of rolling surfaces 11a and 11b respectively face the two rows of rolling surfaces 21a and 21b of the inner member 20 in the radial direction.

The inner member 20 constitutes an inner ring of a rolling bearing structure. The inner member 20 has a hub ring 30 and an inner ring 40. The hub ring 30 has a shaft portion 35 arranged radially inside the outer member 10.

A step portion 31 is formed on the inner side end portion of the outer peripheral surface 36 of the shaft portion 35. The outer diameter of the step portion 31 is smaller than the outer diameter of the other portion of the hub wheel 30. Further, the step portion 31 has a cylindrical shape centered on the rotation axis O.

A rolling surface 21b is formed on the outer side of the outer peripheral surface 36 of the shaft portion 35 with respect to the step portion 31. The rolling surface 21b of the shaft portion 35 faces the rolling surface 11b on the outer side of the outer member 10.

An annular member 60 is arranged on the outer side of the outer peripheral surface 36 of the shaft portion 35 with respect to the rolling surface 21b on the outer side in the radial direction. In the radial direction, a flange plate 50 for connecting the outer peripheral surface 36 of the shaft portion 35 and the annular member 60 in the radial direction is arranged between the outer peripheral surface 36 of the shaft portion 35 and the annular member 60.

Of the outer peripheral surface 36 of the shaft portion 35, a step portion 38 is formed between the rolling surface 21b in the axial direction and the flange plate 50 (annular member 60). A sealing device 2 is arranged on the step 38. The sealing device 2 seals the internal space S in which the rolling element 3 is installed between the inner peripheral surface of the outer member 10 and the outer peripheral surface of the shaft portion 35 of the inner member 20, and the sealing device 2 seals the internal space S of foreign matter to the internal space S. Prevent intrusion. The sealing device 2 has, for example, a core metal 5 fixed to the inner peripheral surface of the outer side end portion of the outer member 10, and a sealing portion 6 fixed to the core metal 5 by vulcanization adhesion or the like.

The cap member 7 is fixed to the inner peripheral surface of the inner side end portion of the outer member 10. The cap member 7 closes the opening at the inner end of the outer member 10 to prevent foreign matter from entering.

The inner ring 40 is fitted to the step portion 31 on the inner side of the hub ring 30.

A rolling surface 21a is formed on the outer side of the outer peripheral surface of the inner ring 40. The rolling surface 21a of the inner ring 40 faces the rolling surface 11a on the inner side of the outer member 10.

Next, the flange plate 50 and the annular member 60 will be described in detail. FIG. 2 is a view of the flange plate 50 and the annular member 60 of the first embodiment as viewed from the inner side (inside in the axial direction). FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 2 (a view showing only a cross section).

The annular member 60 is arranged on the radial outer side of the outer peripheral surface 36 of the shaft portion 35 of the hub ring 30 via a radial gap. The central axis of the annular member 60 coincides with the central axis O of the hub ring 30. That is, the inner peripheral surface 61 and the outer peripheral surface 63 of the annular member 60 are cylindrical surfaces centered on the central axis O.

The flange plate 50 extends radially so as to connect the inner peripheral surface 61 of the annular member 60 and the outer peripheral surface 36 of the shaft portion 35 of the hub ring 30 in the radial direction. As shown in FIG. 2, the flange plate 50 has a disk shape when viewed from the inner side in a plan view. However, the flange plate 50 is not a simple planar disk shape, but has an inner convex portion 51 projecting inward in the axial direction (inner side, upper side in FIG. 3) and an axial direction as shown in FIG. The outer convex portion 52 protruding to the outside (outer side, lower side in FIG. 3) is a waveform formed alternately in the circumferential direction.

The shapes and numbers of the inner convex portion 51 and the outer convex portion 52 may be appropriately changed, but here, the inner convex portion 51 and the outer convex portion 52 shown in FIGS. 1 to 3 will be described.

The inner convex portion 51 is fan-shaped when viewed from the axial direction (see FIG. 2), and its cross-sectional shape is U-shaped (see FIG. 3, the upper part of the figure is the inner side in the axial direction). As shown in FIG. 3, the axial inner side surface 51A and the axial outer surface 51B of the inner convex portion 51 have a substantially planar shape.

The outer convex portion 52 is fan-shaped when viewed from the axial direction (see FIG. 2), and its cross-sectional shape is rectangular (see FIG. 3). As shown in FIG. 3, the axial inner side surface 52A and the axial outer surface 52B of the outer convex portion 52 have a substantially planar shape.

Both ends in the circumferential direction of the inner convex portion 51 and both ends in the circumferential direction of the outer convex portion 52 are connected by a wall portion 53 extending in the axial direction. Therefore, as shown in FIG. 2, in the circumferential direction, "inner convex portion 51, wall portion 53, outer convex portion 52, wall portion 53, inner convex portion 51 ..." are continuously connected in this order. As a result, the flange plate 50 is formed into a corrugated shape. The flange plate 50 has a waveform as described above by press molding.

The entire circumference of the inner peripheral surface 50A of the flange plate 50 is welded to the entire circumference of the outer peripheral surface 36 of the shaft portion 35 of the hub ring 30. The inner peripheral surface 50A of the flange plate 50 includes an inner peripheral surface 51C of the plurality of inner convex portions 51, an inner peripheral surface 52C of the plurality of outer convex portions 52, and an inner peripheral surface 53A of the plurality of wall portions 53. Consists of. Therefore, the inner peripheral surface 51C of the plurality of inner convex portions 51, the inner peripheral surface 52C of the plurality of outer convex portions 52, and the inner peripheral surface 53A of the plurality of wall portions 53 are the outer peripheral surface 36 of the shaft portion 35. It is welded all around.

The entire circumference of the outer peripheral surface 50B of the flange plate 50 is welded to the entire circumference of the inner peripheral surface 61 of the annular member 60. The outer peripheral surface 50B of the flange plate 50 is composed of an outer peripheral surface 51D of the plurality of inner convex portions 51, an outer peripheral surface 52D of the plurality of outer convex portions 52, and an outer peripheral surface 53B of the plurality of wall portions 53. .. Therefore, the outer peripheral surface 51D of the plurality of inner convex portions 51, the outer peripheral surface 52D of the plurality of outer convex portions 52, and the outer peripheral surface 53B of the plurality of wall portions 53 are all of the inner peripheral surface 61 of the annular member 60. Welded around the circumference.

FIG. 3 shows a state in which the outer peripheral surface 51D of the inner convex portion 51 and the inner peripheral surface 61 of the annular member 60 are welded to form a welding mark W.

In the present embodiment, fillet welding is adopted as the welding method between the flange plate 50 and the shaft portion 35 and the flange plate 50 and the annular member 60, but other welding such as laser welding is adopted. You may adopt the method.

The entire circumference of the inner peripheral surface 50A of the flange plate 50 is welded to the entire circumference of the outer peripheral surface 36 of the shaft portion 35 of the hub ring 30, and the entire circumference of the outer peripheral surface 50B of the flange plate 50 is the inner peripheral surface 61 of the annular member 60. After welding all around, these welds are finished.

A press-fit nut 70 (fastening member) provided with a bolt hole 71 for inserting a hub bolt (not shown) is fixed to the flange plate 50. More specifically, as shown in FIG. 1, the outer convex portion 52 of the flange plate 50 is provided with a through hole 52E that penetrates axially from the axial inner side surface 52A to the axial outer surface 52B. Then, the press-fit nut 70 is press-fitted and fixed in the through hole 52E. As shown in FIG. 2, since the circumferential width of the outer convex portion 52 is larger than the circumferential width of the inner convex portion 51, it is easy to fix the press-fit nut 70 to the outer convex portion 52.

The press-fit nut 70 has a bolt hole 71 in which a female screw portion is formed. Then, the hub bolt is inserted into the bolt hole 71, and the hub bolt is fastened to the wheel (driving wheel or driven wheel), whereby the wheel is fixed to the flange plate 50.

In the example of FIG. 2, the press-fit nut 70 is fixed to the outer convex portion 52 of half of the plurality of outer convex portions 52, but the number of the outer convex portions 52 to which the press-fit nut 70 is fixed is particularly limited. is not.

Further, the fastening member fixed to the flange plate 50 and provided with a bolt hole for inserting a hub bolt is not limited to the press-fit nut 70, and may be, for example, a block provided with a bolt hole. When the fastening member is a block, this block is fixed to the flange plate 50 by means such as welding.

In the illustrated example, the width of the press-fit nut 70 is made smaller than the depth of the corrugated valley of the flange plate 50 in consideration of the mountability of the press-fit nut 70, but the axial rigidity of the flange plate 50 is increased. Therefore, the width of the press-fit nut 70 can be made larger than the depth of the corrugated valley of the flange plate 50.

As described above, according to the hub unit bearing 1 of the present embodiment, the flange plate 50 connected to the outer peripheral surface of the inner member 20 (the outer peripheral surface 36 of the shaft portion 35) and extending in the radial direction, and the flange plate 50. An annular member 60 connected to the outer peripheral surface 52D of the above. The flange plate 50 has a waveform in which an inner convex portion 51 projecting inward in the axial direction and an outer convex portion 52 projecting outward in the axial direction are alternately formed in the circumferential direction.

As described above, since the flange plate 50 has a corrugated shape, the rigidity and strength can be increased even if the flange plate 50 is thin, so that the mass and rotational inertia of the hub wheel 30 can be reduced.

Further, since the annular member 60 is provided, the rigidity of the flange plate 50 in the axial direction is maintained, and the rigidity in the circumferential direction is also increased, so that deformation due to a force in the circumferential direction can be suppressed.

In particular, in hub unit bearings used for drive wheels, it is necessary to transmit driving force and braking force to the road surface, so if the circumferential rigidity of the hub flange is insufficient, the flange shape seen from the radial direction will be deformed and drive / In addition to causing a feeling of delay in braking control, there is a possibility that fluffing corrosion with the brake rotor will progress, the wheel alignment will be out of alignment, and steering stability will be reduced. Further, if the brake rotor is a disc, it may cause a problem such as an increase in brake judder. However, in the present embodiment, the deformation of the shape of the flange plate 50 can be suppressed, so that the occurrence of the above-mentioned defects is suppressed.

Further, the flange plate 50 is made corrugated by press forming. Therefore, the strength of the flange plate 50 can be increased by work hardening.

The entire circumference of the inner peripheral surface 50A of the flange plate 50 is fillet welded to the entire circumference of the outer peripheral surface of the inner member 20 (the outer peripheral surface 36 of the shaft portion 35), and the entire circumference of the outer peripheral surface 50B of the flange plate 50 is formed. It is firmly welded to the entire circumference of the inner peripheral surface 61 of the annular member 60.

The axial outer surface 52B of the flange plate 50, the axial outer portion of the outer peripheral surface of the inner member 20 (the outer peripheral surface 36 of the shaft portion 35) from the axial outer surface 52B, and the axial outer surface of the annular member 60. And are integrally finished so that the disc rotor can be attached to the axial outer surface 52B of the flange plate 50 without vibration.

A fastening member provided with a bolt hole for inserting a hub bolt is fixed to the flange plate 50. The fastening member of this embodiment is a press-fit nut 70 that is press-fitted and fixed to the flange plate 50. Therefore, it is possible to obtain a bolt hole having a sufficient axial width at low cost.

(Second embodiment)
Next, the second embodiment will be described. FIG. 4 is a cross-sectional view showing a state in which the first reinforcing plate 80 is fixed to the flange plate 50 according to the second embodiment.

In the present embodiment, the first reinforcing plate 80 is fixed to the axial outer surface 50C of the flange plate 50. As shown in FIG. 4, the cross section of the first reinforcing plate 80 is flat. That is, the first reinforcing plate 80 has a planar axial inner side surface 83 and an axial outer surface 85. Although not shown, the shape of the first reinforcing plate 80 and the shape of the flange plate 50 are substantially the same when viewed from the axial direction. That is, the axial outer surface 50C of the flange plate 50 is covered with the first reinforcing plate 80. However, the first reinforcing plate 80 is formed with a communication hole 81 so as to communicate with the through hole 52E of the outer convex portion 52 of the flange plate 50. Therefore, the hub bolt inserted into the bolt hole 71 of the press-fit nut 70 fixed to the through hole 52E can reach the wheel through the communication hole 81 of the first reinforcing plate 80.

The axial outer surface 50C facing the axial outer side of the flange plate 50 includes the axial outer surface 51B of the inner convex portion 51 and the axial outer surface 52B of the outer convex portion 52, but is located on the axial outer side. The first reinforcing plate 80 is fixed to the axial outer surface 52B of the outer convex portion 52 by welding. FIG. 4 shows a welding mark W1 of the axial outer surface 52B of the outer convex portion 52 and the first reinforcing plate 80. Examples of the welding means for the axial outer surface 52B of the outer convex portion 52 and the axial inner side surface 83 of the first reinforcing plate 80 include spot welding and friction welding.

According to the present embodiment, a rectangular cross-sectional structure T surrounded by an axial outer surface 51B of the inner convex portion 51, an axial inner side surface 83 of the first reinforcing plate 80, and a pair of wall portions 53 is formed. .. Therefore, the rigidity and strength of the flange plate 50 in the axial direction and the circumferential direction are further improved.

Further, according to the present embodiment, in order to increase the axial rigidity, the depth of the corrugated valley of the flange plate 50 is made larger than the width of the press-fit nut 70, but the press-fit is made in consideration of mountability. The width of the nut 70 can also be made larger than the depth of the corrugated valley of the flange plate 50.

(Third embodiment)
Next, the third embodiment will be described. FIG. 5 is a cross-sectional view showing a state in which the second reinforcing plate 90 is fixed to the flange plate 50 according to the third embodiment.

In the present embodiment, the second reinforcing plate 90 is fixed to the axial inner side surface 50D of the flange plate 50. As shown in FIG. 5, the cross section of the second reinforcing plate 90 is flat. That is, the second reinforcing plate 90 has a planar axial inner surface 93 and an axial outer surface 95. Although not shown, the shape of the second reinforcing plate 90 and the shape of the flange plate 50 are substantially the same when viewed from the axial direction. That is, the axial inner side surface 50D of the flange plate 50 is covered with the second reinforcing plate 90. However, the second reinforcing plate 90 is formed with a communication hole 91 at a position overlapping the portion where the press-fit nut 70 of the flange plate 50 is provided. Therefore, the press-fit nut 70 can be fixed to the flange plate 50 via the communication hole 91. Further, the hub bolt is inserted into the bolt hole 71 of the press-fit nut 70 fixed to the through hole 52E via the communication hole 91, and can reach the wheel.

The axial inner side surface 50D facing the axially inward side of the flange plate 50 includes the axial inner side surface 51A of the inner convex portion 51 and the axial inner side surface 52A of the outer convex portion 52, but is located inside the axial direction. The second reinforcing plate 90 is fixed to the inner side surface 52A in the axial direction of the inner convex portion 51 by welding. FIG. 5 shows a welding mark W2 between the axial inner side surface 51A of the inner convex portion 51 and the axial outer surface 95 of the second reinforcing plate 90. Examples of the welding means for the axial inner side surface 51A of the inner convex portion 51 and the second reinforcing plate 90 include spot welding and friction welding.

According to the present embodiment, since the welded portion of the second reinforcing plate 90 with respect to the flange plate 50 is on the inner side (inner side) in the axial direction of the flange plate 50, deformation due to welding can be reduced, and the deformation due to welding can be reduced in the axial direction of the outer convex portion 52. The amount of machining of the outer side surface 52B can be reduced. Therefore, it is possible to obtain the flange plate 50 which is low in cost and has excellent flatness of the outer convex portion 52 while maintaining the wall thickness of the outer convex portion 52.

Further, according to the present embodiment, in order to increase the axial rigidity, the depth of the corrugated valley of the flange plate 50 is made larger than the width of the press-fit nut 70, but in consideration of mountability, The width of the press-fit nut 70 can be made larger than the depth of the corrugated valley of the flange plate 50.

(Fourth Embodiment)
Next, a fourth embodiment will be described. FIG. 6 is a cross-sectional view showing a state in which the first reinforcing plate 80 and the second reinforcing plate 90 are fixed to the flange plate 50 according to the fourth embodiment.

In the present embodiment, the first reinforcing plate 80 is fixed to the axial outer surface 50C of the flange plate 50, and the second reinforcing plate 90 is fixed to the axial inner side surface 50D of the flange plate 50. That is, the present embodiment has a configuration in which the second embodiment and the third embodiment are combined.

In order to weld the axial outer surface 52B of the outer convex portion 52 to the first reinforcing plate 80, the second reinforcing plate 90 is provided with a hole 97 for inserting a welding jig. Therefore, the hole 97 and the welding mark W1 face each other in the axial direction.

According to the present embodiment, the structure of the flange plate 50 sandwiched between the first reinforcing plate 80 and the second reinforcing plate 90 has a corrugated cardboard-like structure (truss structure), and thus the second embodiment and the third embodiment. Further, the rigidity and strength of the flange plate 50 in the axial direction and the circumferential direction are improved as compared with the form.

Further, according to the present embodiment, in order to increase the axial rigidity, the width of the press-fit nut 70 is made larger than the depth of the corrugated valley of the flange plate 50, but the press-fit nut 70 is made in consideration of mountability. The width of the flange plate 50 can be made larger than the depth of the corrugated valley of the flange plate 50.

FIG. 7 shows a view of the flange plate 50 and the annular member 60 according to the fourth embodiment as viewed from the inner side (inside in the axial direction). Most of the axial inner surface 50D of the flange plate 50 is covered by the second reinforcing plate 90.

In the configuration as in the fourth embodiment, as shown in FIG. 6, the space S1 surrounded by the flange plate 50 and the first reinforcing plate 80 and the space S2 surrounded by the flange plate 50 and the second reinforcing plate 90 are formed. Will be done. Water may collect in these spaces S1 and S2 and cause corrosion.

Therefore, as shown in FIG. 7, the second reinforcing plate 90 and the flange plate 50 have drain holes communicating with the respective spaces S1 and S2 from the outside inside the second reinforcing plate 90 and the flange plate 50 in the axial direction. 9 is provided.

The drain hole 9 that communicates the space S1 with the outside inside in the axial direction extends axially so as to pass through the second reinforcing plate 90 and the inner convex portion 51 of the flange plate 50. The drain hole 9 that communicates the space S2 with the outside inside in the axial direction extends axially so as to penetrate the second reinforcing plate 90.

The drain hole 9 is preferably provided at the radial outer end of the inner convex portion 51 of the second reinforcing plate 90 and the flange plate 50. As a result, the water accumulated in the spaces S1 and S2 is displaced outward in the radial direction by the centrifugal force, and is discharged to the outside inside in the axial direction through the drain hole 9.

(Fifth Embodiment)
Next, the fifth embodiment will be described. FIG. 8 is a cross-sectional view showing the hub unit bearing 1 according to the fifth embodiment.

In the hub unit bearing 1 of the present embodiment, the bolt hole 71 having the female threaded portion of the press-fit nut 70 is changed to the cylindrical hole 73 as compared with the first embodiment. The hub bolt 8 is serrated and fitted into the cylindrical hole 73.

The configuration of this embodiment can be applied not only to the first embodiment but also to the second to fourth embodiments.

In the hub unit bearing 1 of the above-described embodiment, the flange plate 50 for wheel mounting is provided on the inner member 20, but the flange plate 50 for wheel mounting may be provided on the outer member 10. do not have. In that case, the annular member 60 is arranged radially outside the outer member 10, and the flange plate 50 connects the outer peripheral surface of the outer member 10 and the inner peripheral surface of the annular member 10.

The present invention is not limited to each embodiment, and can be carried out within a range that does not deviate from the gist of the present invention, and various modifications can be made.

1 Hub unit bearing, 2 Sealing device, 3 Rolling element, 4 Cage, 5 Core metal, 6 Seal part, 7 Cap member, 8 Hub bolt, 9 Drain hole, 10 Outer member, 11a, 11b Rolling surface, 20 Inner member, 21a, 21b rolling surface, 30 hub ring, 31 step part, 35 shaft part, 36 outer peripheral surface, 38 step part, 40 inner ring, 50 flange plate, 50A inner peripheral surface, 50B outer peripheral surface, 50C axial direction Outer side surface, 50D axial inner side surface, 51 inner convex part, 51A axial inner side surface, 51B axial outer surface, 51C inner peripheral surface, 51D outer peripheral surface, 52 outer convex part, 52A axial inner side surface, 52B axial outer side Side surface, 52C inner peripheral surface, 52D outer peripheral surface, 52E through hole, 53 wall part, 53A inner peripheral surface, 53B outer peripheral surface, 60 annular member, 61 inner peripheral surface, 63 outer peripheral surface, 70 press-fit nut (fastening member), 71 Bolt hole, 73 Cylindrical hole, 80 First reinforcing plate, 81 Communication hole, 83 Axial inner surface, 85 Axial outer surface, 90 Second reinforcing plate, 91 Communication hole, 93 Axial inner surface, 95 Axial outer surface , 97 holes, O rotation axis, T cross section rectangular structure, S internal space, S1, S2 space, W, W1, W2 welding marks

Claims (4)

An outer member having multiple rows of rolling surfaces formed on the inner peripheral surface,
An inner member having multiple rows of rolling surfaces formed on the outer peripheral surface,
A plurality of rolling elements arranged between the double row rolling surface of the outer member and the double row rolling surface of the inner member.
In hub unit bearings
A flange plate connected to the outer peripheral surface of the outer member or the inner member and extending in the radial direction,
An annular member connected to the outer peripheral surface of the flange plate and
Equipped with
The flange plate has a waveform in which an inward convex portion protruding inward in the axial direction and an outer convex portion protruding outward in the axial direction are alternately formed in the circumferential direction.
Hub unit bearing. The hub unit bearing according to claim 1, wherein a fastening member provided with a bolt hole for inserting a hub bolt is fixed to the flange plate. The hub unit bearing according to claim 1 or 2, wherein a reinforcing plate is welded to the axial inner surface or the axial outer surface of the flange plate. An outer member having multiple rows of rolling surfaces formed on the inner peripheral surface,
An inner member having multiple rows of rolling surfaces formed on the outer peripheral surface,
A plurality of rolling elements arranged between the double row rolling surface of the outer member and the double row rolling surface of the inner member.
It is a manufacturing method of a hub unit bearing provided with
The flange plate is formed into a corrugation in which an inward convex portion protruding inward in the axial direction and an outer convex portion protruding outward in the axial direction are alternately formed in the circumferential direction by press molding.
The entire circumference of the inner peripheral surface of the flange plate is welded to the entire circumference of the outer member or the outer peripheral surface of the inner member.
An annular member is arranged on the radial outer side of the flange plate.
The entire circumference of the outer peripheral surface of the flange plate is welded to the entire circumference of the inner peripheral surface of the annular member.
The axial outer surface of the flange plate, the portion of the outer peripheral surface of the outer member or the inner member that is axially outer of the axial outer surface of the flange plate, and the axial outer surface of the annular member. , How to manufacture hub unit bearings for finishing.

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