JP5087901B2 - Rolling bearing device for wheels - Google Patents

Description

  The present invention relates to a wheel rolling bearing device for supporting wheels of a vehicle such as an automobile.

Wheel rolling bearing devices for supporting wheels are used for vehicles such as automobiles. The wheel rolling bearing device includes a rotating wheel having a flange to which a vehicle brake rotor and wheels are attached, a fixed wheel fixed to the vehicle side and arranged concentrically with the rotating wheel, the rotating wheel, and the fixed wheel. And a plurality of rolling elements arranged so as to be freely rollable.
In the above-mentioned wheel rolling bearing device, for weight reduction, the flange extends radially outward from the rotating wheel, and a hub bolt for fixing a vehicle brake and the vehicle wheel is fixed. A structure composed of a plurality of arm portions in which through holes are formed has been proposed (see, for example, Patent Document 1).

JP 2003-94905 A (FIG. 2)

The flange of such a wheel rolling bearing device has a hub nut screwed into the hub bolt in a state where the brake rotor is in contact with an outer surface of the plurality of arm portions facing the vehicle outward side. And it is fixed by tightening.
However, in the conventional wheel rolling bearing, since the flange is constituted by the plurality of arm portions, the weight can be reduced as compared with the flange continuously formed over the entire circumference. However, the rigidity may be insufficient.
For this reason, the rigidity of the arm portion is increased by increasing the thickness of the entire arm portion. However, when the thickness of the entire arm portion is increased, the outer surface of the brake mounting portion abuts. The design dimensions of the entire knuckle including the wheel rolling bearing device may have to be changed, such as the change in the axial position, etc., and it is not preferable to change the shape of the entire arm part significantly. For this reason, a measure to increase the rigidity without changing the dimension of the flange, in particular, the axial position of the outer surface of the arm part constituting the flange, has been desired.
This invention is made | formed in view of such a situation, and it aims at providing the rolling bearing apparatus for wheels which can improve the rigidity of the said flange, without changing the dimension of a flange largely.

The present invention includes a rotating wheel having a flange to which a brake rotor and wheels of a vehicle are attached, a fixed wheel fixed to the vehicle side and disposed concentrically with the rotating wheel,
A plurality of rolling elements disposed between the rotating wheel and the fixed wheel so as to be freely rollable, the flange extending radially outward from the rotating wheel, and the brake rotor and the wheel. In the rolling bearing device for a wheel comprising a plurality of arm portions, in which a through-hole for fixing a hub bolt for attaching the brake rotor is formed, and the brake rotor contacts and is fixed to an outer surface facing the outer side of the vehicle, the arm portion The hub bolt is protruded inward from the bolt seating surface of the arm portion with which the head of the hub bolt abuts on the inner surface facing the vehicle inward side. , so as to surround the portion other than the radially outer side of the arm portion, which is characterized in that the thick portion extending radially outward along the side edges of the rotary wheel the arm portion is formed A.

  According to the rolling bearing device for a wheel configured as described above, since the thick portion is formed along both side edges of the arm portion, the thick portion functions as a rib for reinforcing the arm portion, The rigidity of the part can be increased. Further, since the thick wall portion is formed on the inner surface of the arm portion so as to protrude inward of the vehicle from the bolt seat surface, it is not necessary to change the axial position of the outer surface of the arm portion. .

In the above-described wheel rolling bearing device, it is preferable that a distal end edge of the thick portion in the radial direction is located radially outward from a center position of the through hole.
In this case, in the arm part, the thick part is formed at both side edges of the part where the through hole having relatively low rigidity is located, so that the rigidity of the arm part can be increased more effectively.
In addition, the distal end portion of the thick wall portion on the radially outer side extends radially outward from the base end portion, is formed in a rib shape on both side edges of the arm portion, and surrounds both sides of the hub bolt head portion. It is formed, and it may be made to incline so that it may become thin gradually toward the front-end edge of a diameter direction, and you may make it connect with a bolt seat surface smoothly.
In this way, by smoothly connecting to the tip edge of the tip portion, it is possible to prevent stress from concentrating on the boundary between the tip portion of the thick portion and the bolt seat surface.

  According to the rolling bearing device for a wheel of the present invention, the arm portion is reinforced by the thick portion protruding inward of the vehicle. Stiffness can be increased.

  Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a sectional view showing a configuration of a wheel rolling bearing device according to an embodiment of the present invention. The wheel rolling bearing device 10 supports a wheel of a vehicle such as an automobile so as to be rotatable with respect to a suspension device.

The wheel rolling bearing device 10 includes an outer ring 11, an inner shaft (hub) 12, a plurality of balls 13 as rolling elements disposed between the outer ring 11 and the inner shaft 12, and these balls 13 in the circumferential direction and the like. A cage 14 that is held at an interval, and seal members 15 and 18 that seal an annular gap between the outer ring 11 and the inner shaft 12 are provided.
The outer ring 11 is a fixed ring that is fixed to the vehicle side. First and second outer ring raceways 11a and 11b are formed on the inner peripheral surface of the outer ring 11, and the outer peripheral surface is attached to a suspension device (not shown) of the vehicle. A mounting portion 11c is formed.
The inner shaft 12 is a rotating wheel and constitutes an axle to which a vehicle wheel is attached, and is disposed concentrically on the inner peripheral side of the outer wheel 11. The inner shaft 12 is configured by combining an inner shaft main body 16 and an inner ring 17.
The inner shaft main body 16 has a wheel W that constitutes a wheel on one end side, a flange 20 to which a brake drum B as a brake rotor is attached, an inlay portion 16c that is fitted into the inner diameter surface of the wheel W and the brake drum B, Is formed. A small diameter portion 16b having a smaller diameter than the inner ring raceway 12a is formed on the other end side. In addition, a first inner ring raceway 16a is formed on the outer peripheral surface of the inner shaft main body 16 so as to face the first outer ring raceway 11a.

The inner ring 17 is formed in an annular shape, and is inserted into the small-diameter portion 16b of the inner shaft main body 16 in a press-fitted state, and is moved in the axial direction by a caulking portion 16d formed at the other end of the inner shaft main body 16. Is regulated so that it can rotate integrally with the inner shaft main body 16. In addition, a second inner ring raceway 17a is formed on the outer peripheral surface of the inner ring 17 so as to face the second outer ring raceway 11b.
Between the first and second outer ring raceways 11a, 11b and the first and second inner ring raceways 16a, 17a, a plurality of balls 13 can roll with a predetermined contact angle with respect to each raceway. The wheel rolling bearing device 10 is configured as a double row angular ball bearing. Therefore, the inner shaft 12 is rotatably supported with respect to the outer ring 11.
In the rolling bearing device 10 for a wheel, the one end side (the right side on the paper surface) of the inner shaft main body 16 on which the flange 20 to which the wheel W is attached is formed, and the other end side (the left side on the paper surface) is on the vehicle outer side. It is fixed to the vehicle so as to be inside the vehicle.

FIG. 2 is an external view showing the shape of the flange 20 when viewed from the direction of arrow A in FIG. Referring to FIGS. 1 and 2, the flange 20 includes four arm portions 21 that extend radially outward from an inner shaft 12 (inner shaft main body 16) as a rotating wheel. These arm portions 21 are arranged at equal intervals in the circumferential direction, and a through hole 22 to which a hub bolt H for fixing the brake drum B and the wheel W is fixed is formed in the central portion of the arm portion 21. Yes.
The inner peripheral surface of the through hole 22 and the outer peripheral surface of the hub bolt H are formed with spline grooves that mesh with each other. The hub bolt H is fixed to the arm portion 21 by spline fitting with the through hole 22. Yes.
The brake drum B is disposed on the outer surface 21a of the arm portion 21 facing the vehicle outward side with the mounting portion B1 in contact therewith. A wheel W is further stacked on the outer side of the brake drum B, and the brake drum B and the wheel W are clamped by an outer surface 21a and a hub nut N screwed to the hub bolt H, whereby the arm portion 21 is provided. And is attached to the flange 20.

  A bolt seat surface 23 is formed on the inner surface 21b of the arm portion 21 facing the vehicle inward side so as to be substantially parallel to the axially orthogonal surface and against which the head H1a of the hub bolt H abuts. Furthermore, the inner side surface 21b is made thicker by projecting inward of the vehicle than the bolt seat surface 23, and the both sides of the arm portion 21 are extended from the inner shaft main body 16 so as to surround the periphery of the head H1a of the hub bolt H1. A thick portion 24 is formed extending radially outward along the edge.

  When the thick portion 24 is viewed from the front, the base end portion 24a on the inner shaft main body 16 side of the thick portion 24 has both side edges of the arm portion 21, the outer peripheral surface of the inner shaft main body 16, and the base end portion 24a. It is formed to be thick over the entire region surrounded by the boundary portion 24a1 with the bolt seat surface 23. Further, a boundary portion 24a1 between the base end portion 24a and the bolt seat surface 23 is formed so as to surround the periphery of the head portion H1 of the hub bolt H. In this way, the base end portion 24a of the thick portion 24 is formed so that the base end portion of the arm portion 21 is thick while avoiding the head portion H1, thereby The strength at the base end can be increased.

  The distal end portion 24b on the radially outer side of the thick wall portion 24 extends radially outward from the proximal end portion 24a, is formed in a rib shape on both side edges of the arm portion 21, and is formed on the head H1 of the hub bolt H. It is formed so as to surround both sides, and is inclined so as to gradually become thin toward the distal end edge 24b1 in the radially outward direction, and is smoothly connected to the bolt seat surface 23. In this way, by smoothly connecting the leading edge 24b1 of the leading end portion 24b, stress is prevented from concentrating on the boundary between the leading end portion 24b of the thick wall portion 24 and the bolt seat surface 23. Further, the tip edge 24 b 1 of the tip part 24 b is formed so as to be positioned radially outward from the central axis 22 a of the through hole 22.

  In the wheel rolling bearing device 10 having the above-described configuration, the brake drum B and the wheel W are attached to the flange 20 formed by the arm portion 21, and the outer ring 11 is fixed to the suspension device on the vehicle side. It is supported rotatably with respect to the vehicle.

According to the wheel rolling bearing device 10 of the present embodiment configured as described above, since the thick portion 24 is formed along both side edges of the arm portion 21, the thick portion 24 defines the arm portion 21. It functions as a rib to reinforce, and the rigidity of the arm portion 21 can be increased. Further, since the thick portion 24 is formed on the inner side surface 21b so as to protrude from the bolt seat surface 23 of the arm portion 21 toward the vehicle inner side, the axial direction of the outer side surface 21a of the arm portion 21 is formed. There is no need to change the position, and there is no need to greatly change the dimensions of the flange 20.
As described above, the wheel rolling bearing device 10 according to the present embodiment can increase the rigidity of the wheel rolling bearing device 10 without greatly changing the dimension of the flange 20 by the thick portion 24 formed on the arm portion 21. Even if the rigidity of the mounting part B1 of the brake drum B is set to be low in order to alleviate the distortion of B, the rigidity of the mounting part B1 is not changed without changing the design of the entire knuckle including the wheel rolling bearing device 10. To prevent early breakage of the brake drum B.

  In the present embodiment, the distal end edge 24b1 of the thick portion 24 is positioned radially outward from the central axis 22a of the through hole 22, so that the arm portion 21 has relatively low rigidity. Thick portions 24 are formed at both side edges of the portion where the through hole 22 is located. As a result, the rigidity of the arm portion 21 can be increased more effectively.

In addition, the rolling bearing device for wheels of this invention is not limited to the said embodiment. For example, in the above embodiment, a double row angular contact ball bearing is shown. However, for example, it can be applied to a double row tapered roller bearing, a rolling bearing device constituting a single row ball bearing, or the like. it can. In the above embodiment, the outer ring 11 is a fixed ring and the inner shaft 12 is a rotating ring. However, the present invention can also be applied to a rolling bearing device having an outer ring as a rotating ring and an inner ring as a fixed ring. it can.
Moreover, although the case where the brake drum of the drum brake was attached as a brake rotor was shown in the said embodiment, it is applicable also to the disc rotor of a disc brake.

It is sectional drawing which shows the structure of the rolling bearing apparatus for wheels which is 1st embodiment of this invention. It is the external view which showed the shape of the flange when it sees from the direction of the arrow A in FIG.

Explanation of symbols

10 Rolling bearing device for wheels 11 Outer ring (fixed ring)
12 Inner shaft (rotating wheel)
13 balls (rolling elements)
20 Flange 21 Arm portion 21a Outer side surface 21b Inner side surface 22 Through hole 23 Bolt seat surface 24 Thick portion 24b1 Tip edge B Brake drum (brake rotor)
H hub bolt H1 head W wheel (wheel)

Claims (2)

A rotating wheel having a flange to which a vehicle brake rotor and wheels are attached;
A fixed wheel fixed to the vehicle side and arranged concentrically with the rotating wheel;
A plurality of rolling elements arranged to freely roll between the rotating wheel and the fixed wheel,
The flange extends radially outward from the rotating wheel, and a through hole in which a hub bolt for mounting the brake rotor and the wheel is fixed is formed, and the brake rotor is formed on an outer surface facing the vehicle outer side. In a rolling bearing device for a wheel comprising a plurality of arm portions fixed in contact with each other,
The arm portion is made thicker by projecting inward from the bolt seating surface of the arm portion with which the head of the hub bolt abuts on the inner side surface facing the vehicle inward side of the hub bolt. A thick portion extending radially outward from the rotating wheel along both side edges of the arm portion is formed so as to surround a portion of the head other than the radially outer side of the arm portion. Rolling bearing device for wheels. The distal end portion on the radially outer side of the thick wall portion extends radially outward from the base end portion, is formed in a rib shape on both side edge portions of the arm portion, and is formed so as to surround both sides of the hub bolt head portion. The rolling bearing device for a wheel according to claim 1, wherein the rolling bearing device for a wheel according to claim 1 is inclined so as to gradually become thinner toward a distal end edge in a radially outward direction and is smoothly connected to a bolt seat surface .

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