JP2021088235A - Wheel bearing device and wheel attachment method - Google Patents

Abstract

To provide a wheel bearing device which can prevent falling of a wheel during attachment of the wheel and enables work, in which the wheel is fixed to a flange part by bolts, to be performed easily, and to provide a wheel attachment method.SOLUTION: A wheel bearing device 1 includes: an inner member 2 attached with a wheel 80 having a supported part 81 provided with a center hole 800; an outer member 3 fixed to a knuckle 91; and rolling elements 41. The inner member 2 has: a flange part 22 for fixing the supported part 81; and a support part 23 which is fitted in the center hole 800 and supports the supported part 81. The support part 23 has: a cylindrical part 231 having an outer peripheral surface 231a which is fitted in an inner peripheral surface 800a of the center hole 800; and a protruding part 232 protruding from the cylindrical part 231 to the radial outer side. In the wheel 80, the supported part 81 is disposed at an axial position between the flange part 22 and the protruding part 232 and a portion, in which a recessed part 801 is not formed, of the supported part 81 is engaged with the protruding part 232 to be prevented from removing.SELECTED DRAWING: Figure 1

Description

The present invention relates to a wheel bearing device and a wheel mounting method.

Conventionally, as a mounting structure for attaching a wheel to a hub of a wheel bearing device (hub unit), a stat bolt press-fitted and fixed to a flange portion of the hub, for example, as described in Patent Document 1, is used as a wheel bolt. A structure in which a nut is screwed into a screw portion of a stat bolt by inserting it into a hole has been widely used, but in recent years, a bolt inserted into a bolt hole of a wheel, for example, as described in Patent Document 2, has been used. A structure has been proposed in which a screw is screwed into a screw hole (tap hole) provided in a flange portion of a hub. According to this structure, a nut is not required, which can contribute to the reduction of unsprung weight.

In the structure in which a stat bolt press-fitted and fixed to the flange portion of the hub is inserted into the bolt hole of the wheel, the wheel is supported by inserting a bolt protruding from the hub into the bolt hole of the wheel when the wheel is attached. On the other hand, in the structure in which a bolt is screwed into the screw hole of the flange of the hub to attach the wheel, the center hole of the wheel is fitted to the cylindrical protrusion provided in the center of the hub, and the wheel is temporarily supported. The bolt must be inserted into the bolt hole and screwed, but since this cylindrical protrusion is shorter than the axial length of the center hole of the wheel, the temporarily supported wheel is likely to fall off.

In the case described in Patent Document 2, in view of this problem, a collar portion is projected from the cylindrical portion of a cylindrical member (grease cap) press-fitted into the inside of the in-row portion which is a cylindrical protrusion. It is configured to lock the wheel separated from the in-row portion by the collar portion.

Japanese Unexamined Patent Publication No. 2005-170342 Japanese Unexamined Patent Publication No. 2018-177078

In the structure described in Patent Document 2, although it is possible to prevent the wheel from falling off during the wheel mounting work, it is necessary to add a cylindrical member provided with a flange portion, which increases the number of parts and the assembly man-hours. It ends up. Even if the wheel can be prevented from falling off, if the wheel separates from the in-row portion of the hub during the wheel installation work, it is necessary to redo the work of fitting the center hole of the wheel into the in-row portion, which makes workability easier. The effect of improving the wheel is poor.

Therefore, the present invention provides a wheel bearing device and a wheel mounting method capable of preventing the wheel from falling off when the wheel is mounted and easily fixing the wheel to the flange portion with bolts. The purpose.

In order to achieve the above object, the present invention includes an inner member to which a wheel side member having a supported portion having a central hole is formed, an outer member fixed to the vehicle body side member, and the inner member. A plurality of rolling elements arranged between the outer member and the outer member are provided, and the supported portion is formed with a recess recessed from the inner peripheral surface of the central hole in the radial direction outward. The inner member has a flange portion for fixing the supported portion so as not to be relatively rotatable, and a support portion for fitting the supported portion and supporting the supported portion by fitting into the center hole. A portion is provided so as to project axially from the flange portion, and the support portion includes a cylindrical portion having an outer peripheral surface that fits into the inner peripheral surface of the central hole, and one side end of the cylindrical portion in the axial direction. The portion has a convex portion that protrudes radially outward from the outer peripheral surface, and the wheel side member has the supported portion arranged at an axial position between the flange portion and the convex portion. Provided is a wheel bearing device in which a portion of a supported portion where the concave portion is not formed is locked by the convex portion and is prevented from coming off from the support portion.

Further, in order to achieve the above object, the present invention attaches a wheel for attaching a wheel side member to the inner member of a wheel bearing device in which a plurality of rolling elements are arranged between the inner member and the outer member. In the method, the wheel-side member has a central hole and a supported portion in which a recess recessed from the inner peripheral surface of the central hole in the radial direction is formed, and the inner member is said to have the same. It has a flange portion for fixing the supported portion so as not to rotate relative to each other, and a support portion for fitting the supported portion to support the supported portion, and the supporting portion is axially oriented from the flange portion. The support portion is provided so as to project from the outer peripheral surface to a cylindrical portion having an outer peripheral surface that fits into the inner peripheral surface of the central hole, and an axial one-side end portion of the cylindrical portion in the radial direction from the outer peripheral surface. The cylindrical portion is inserted into the central hole in a state where the concave portion has a convex portion protruding outward and the circumferential position of the concave portion and the circumferential position of the convex portion are matched, and then the concave portion is inserted. The wheel side member is rotated relative to the inner member so that the position in the circumferential direction of the wheel and the position in the circumferential direction of the convex portion do not match, and the convex portion causes the supported portion from the support portion. Provided is a method of mounting a wheel to prevent it from coming off.

According to the wheel bearing device and the wheel mounting method according to the present invention, it is possible to prevent the wheel from falling off when the wheel is mounted and to easily fix the wheel to the flange portion with bolts.

It is sectional drawing which shows the whole structure of the bearing device for a wheel which concerns on embodiment of this invention. It is a block diagram which saw the bearing device for a wheel and a brake rotor from the vehicle outer side. It is a block diagram which looked at the supported part of a wheel from the vehicle inner side. It is a perspective view which shows a part of a wheel bearing device and a brake rotor together with a brake caliper and a brake pad. (A) is an overall view showing the side surface of the wheel on the vehicle inner side, and (b) is an enlarged view showing a part of (a) in an enlarged manner. (A) and (b) are explanatory views which show the wheel mounting procedure.

[Embodiment]
Embodiments of the present invention will be described with reference to FIGS. 1 to 6. The embodiments described below are shown as suitable specific examples for carrying out the present invention. Therefore, although there are some parts that specifically exemplify various technically preferable technical matters, the technical scope of the present invention is not limited to this specific aspect.

(Overall configuration of bearing device for wheels)
FIG. 1 is a cross-sectional view showing an overall configuration of a wheel bearing device according to an embodiment of the present invention. In FIG. 1, a wheel bearing device mounted on a vehicle is shown together with its peripheral portion.

The wheel bearing device 1 rotatably supports the wheels together with the brake rotor 6 with respect to the knuckle 91 constituting the vehicle suspension device. FIG. 1 shows a supported portion 81, which is a part of the wheel 80 of the wheel, and a part of the brake rotor 6. The wheel 80 is one aspect of the wheel side member in the present invention. Hereinafter, in the wheel bearing device 1, the side on which the wheels are mounted (left side in FIG. 1) is referred to as the vehicle outer side, and the opposite side (right side in FIG. 1) is referred to as the vehicle inner side.

The wheel bearing device 1 is located between an inner member 2 composed of a hub 20 and an inner ring 200, an outer member 3 fixed to a knuckle 91 as a vehicle body side member, and an inner member 2 and an outer member 3. Foreign matter can enter the bearing internal space 10 between the plurality of arranged rolling elements 41, the pair of cages 42 and 43 holding the plurality of rolling elements 41, and the inner member 2 and the outer member 3. It is provided with seal rings 51 and 52 on the vehicle outer side and the vehicle inner side to be suppressed. The inner member 2 rotates about the rotation axis O with respect to the outer member 3. Hereinafter, the direction parallel to the rotation axis O is referred to as an axial direction.

The plurality of rolling elements 41 are arranged in a plurality of rows, of which the plurality of rolling elements 41 in the vehicle outer side row are held by the cage 42, and the plurality of rolling elements 41 in the vehicle inner side row are held by the cage 43. ing. The outer member 3 integrally has a cylindrical main body portion 31, a vehicle body mounting flange 32 attached to the knuckle 91, and eaves portions 33 and 34 to which the seal rings 51 and 52 are attached, respectively. The vehicle body mounting flange 32 is fixed to the knuckle 91 by the knuckle bolt 911. Two outer raceway surfaces 3a and 3b on which the rolling elements 41 of the vehicle outer side row and the vehicle inner side row roll are formed on the inner circumference of the main body portion 31.

The wheel 80 has a center hole 800 formed in the center of the supported portion 81, and is attached to the hub 20 by a plurality of hub bolts 100. The hub 20 includes a body portion 21 arranged inside the outer member 3, a flange portion 22 for fixing the supported portion 81 of the wheel 80 and the brake rotor 6 so as not to rotate relative to each other, and a center hole 800 of the wheel 80. It integrally has a support portion 23 for supporting the supported portion 81 of the wheel 80 before being fitted to the flange portion 22 and fixed to the flange portion 22.

The body portion 21 is composed of a large diameter portion 211 and a small diameter portion 212 having different outer diameters, and the large diameter portion 211 is provided on the vehicle outer side of the small diameter portion 212. On the outer peripheral surface of the large-diameter portion 211, an inner raceway surface 2a on which a plurality of rolling elements 41 in the vehicle outer side row roll is formed. An inner ring 200 is fitted on the outer peripheral surface of the small diameter portion 212, and an inner raceway surface 2b on which a plurality of rolling elements 41 in the vehicle inner side row roll is formed on the outer peripheral surface of the inner ring 200.

The flange portion 22 is formed so as to project radially outward from the body portion 21 on the vehicle outer side of the outer member 3. The support portion 23 projects from the flange portion 22 toward the outer side of the vehicle along the axial direction. The flange portion 22 is provided with a plurality of screw holes 220 into which a plurality of hub bolts 100 are screwed. The hub bolt 100 has a head portion 101 and a shaft portion 102, and a male screw 103 screwed into a screw hole 220 of the flange portion 22 is formed at the tip end portion of the shaft portion 102. The screw hole 220 is a through hole that penetrates the flange portion 22 in the axial direction. In the present embodiment, the flange portion 22 is provided with six screw holes 220 at equal intervals in the circumferential direction.

A shaft hole 210 that penetrates the body portion 21 in the axial direction is formed in the central portion of the hub 20. A spline fitting portion 210a is formed on the inner surface of the shaft hole 210, and the stem portion 921 of the joint member 92 of the drive shaft is fitted into the spline fitting portion 210a so as not to rotate relative to each other. The joint member 92 has a cup portion 922 at an end on the vehicle inner side of the stem portion 921, and a constant velocity joint component for transmitting a driving force is arranged inside the cup portion 922. Further, the joint member 92 has a male threaded portion 923 at an end on the vehicle outer side of the stem portion 921, and a nut 93 is screwed into the male threaded portion 923.

The brake rotor 6 includes a disk-shaped mounting portion 61 arranged on the vehicle outer side of the flange portion 22 of the hub 20, and a cylindrical peripheral plate portion 62 extending from the outer peripheral end of the mounting portion 61 toward the vehicle inner side. And a friction portion 63 protruding outward in the radial direction from the end portion of the peripheral plate portion 62 on the vehicle inner side. The mounting portion 61 is formed with a plurality of bolt insertion holes 610 through which the shaft portion 102 of the hub bolt 100 is inserted. The bolt insertion hole 610 is a through hole that penetrates the mounting portion 61 of the brake rotor 6 in the axial direction. The brake rotor 6 is sandwiched between the supported portion 81 of the wheel 80 and the flange portion 22 of the hub 20 by the axial force of the plurality of hub bolts 100, and rotates integrally with the inner member 2.

The inner member 2 smoothly rotates with respect to the outer member 3 by the driving force transmitted from the joint member 92 due to the rolling of the plurality of rolling elements 41. In the present embodiment, the rolling element 41 is a sphere, but the present invention is not limited to this, and may be a tapered roller, for example. Further, in the present embodiment, the inner member 2 has one inner ring 200, but the inner member 2 has two inner rings, and one of the inner rings has an inner raceway surface. 2a may be formed and the inner raceway surface 2b may be formed on the other inner ring.

(Wheel bearing structure)
Next, the bearing structure of the wheel and the mounting method will be described in detail with reference to FIGS. 2 to 6. FIG. 2 is a configuration diagram of the wheel bearing device 1 and the brake rotor 6 as viewed from the vehicle outer side, and FIG. 3 is a configuration diagram of the supported portion 81 of the wheel 80 as viewed from the vehicle inner side. FIG. 4 is a perspective view showing a part of the wheel bearing device 1 and the brake rotor 6 together with the brake caliper 94 and the brake pad 95. 5 (a) is an overall view showing the side surface of the wheel 8 on the vehicle inner side, and FIG. 5 (b) is an enlarged view showing a part of FIG. 5 (a) in an enlarged manner. 6 (a) and 6 (b) are explanatory views showing a mounting procedure of the wheel 8.

The support portion 23 of the hub 20 has a cylindrical cylindrical portion 231 having an outer peripheral surface 231a that fits into the inner peripheral surface 800a of the central hole 800 of the wheel 80, and a cylindrical portion 231 at one end in the axial direction of the cylindrical portion 231. It has a plurality of convex portions 232 protruding outward in the radial direction from the outer peripheral surface 231a of the above. In the present embodiment, the support portion 23 is provided with three convex portions 232 separated from each other in the circumferential direction, and the circumferential length and the radial height of the respective convex portions 232 are common. These three convex portions 232 are provided at equal intervals along the circumferential direction of the cylindrical portion 231. Further, the inner diameter of the central hole 800 of the wheel 80 is formed to be slightly larger than the outer diameter of the cylindrical portion 231.

The mounting portion 61 of the brake rotor 6 is temporarily fixed to the flange portion 22 of the hub 20 by a plurality of temporary fixing bolts 96. The temporary fixing bolt 96 is for fixing the brake rotor 6 to the flange portion 22 even when the wheel 8 is removed from the wheel bearing device 1. The brake rotor 6 is temporarily fixed to the flange portion 22 at a position where a plurality of bolt insertion holes 610 communicate with the screw holes 220 of the flange portion 22. As shown in FIG. 4, the mounting portion 61 of the brake rotor 6 is formed with three notches 611 at the end on the inner diameter side that allow the three convex portions 232 to pass through when mounting on the flange portion 22. There is.

The wheel 8 includes a tire T and a wheel 80. The wheel 80 integrally includes a supported portion 81, a rim portion 82 to which the tire T is attached, and a connecting portion 83 that connects the supported portion 81 and the rim portion 82. The connecting portion 83 has a plurality of spokes 831 and a boss portion 832, and a supported portion 81 is provided on the vehicle inner side of the boss portion 832. The supported portion 81 has a flat plate shape provided with a plurality of bolt insertion holes 810 that communicate with the bolt insertion holes 610 of the brake rotor 6 and allow the shaft portion 102 of the hub bolt 100 to be inserted, and is formed in an annular shape in the axial direction. Has been done. The bolt insertion holes 810 are through holes that penetrate the supported portion 81 in the axial direction, and in the present embodiment, six bolt insertion holes 810 are provided at equal intervals in the circumferential direction.

The supported portion 81 is formed with a plurality of arc-shaped recesses 801 that are recessed outward in the radial direction from the inner peripheral surface 800a of the central hole 800. The number of recesses 801 is the same as the number of convex portions 232 of the support portion 23, and in the present embodiment, the three recesses 801 are provided so as to be separated from each other in the circumferential direction. The circumferential length of each concave portion 801 is longer than the circumferential length of the convex portion 232, and the radial depth of each concave portion 801 is the radial height of the convex portion 232 (the outer peripheral surface of the cylindrical portion 231). It is higher than the protrusion height from 231a).

As shown in FIG. 1, in the wheel 80, the supported portion 81 is arranged at an axial position between the flange portion 22 and the convex portion 232, and the portion of the supported portion 81 where the concave portion 801 is not formed is a convex portion. It is locked by 232 and prevented from coming off from the support portion 23. In other words, the inner peripheral surface 800a of the central hole 800 overlaps with the convex portion 232 in the axial direction, so that the supported portion 81 is prevented from coming off from the supporting portion 23. Next, the procedure for attaching the wheel 8 to the wheel bearing device 1 will be described in detail with reference to FIGS. 6A and 6B.

In FIGS. 6A and 6B, the supported portion 81 of the wheel 80 seen from the outer side of the vehicle is superimposed on the bearing device 1 for wheels and the brake rotor 6 shown by solid lines with broken lines. FIG. 6A shows a state in which the circumferential position of the concave portion 801 and the circumferential position of the convex portion 232 are matched, and the cylindrical portion 231 of the support portion 23 of the hub 20 is inserted into the central hole 800 of the wheel 80. Is shown. In this state, the cylindrical portion 231 is inserted through the central hole 800, and the supported portion 81 is supported by the support portion 23.

After that, as shown in FIG. 6B, with the cylindrical portion 231 inserted through the central hole 800, the wheel is set so that the circumferential position of the concave portion 801 and the circumferential position of the convex portion 232 do not match. The 80 is rotated relative to the hub 20. As a result, the supported portion 81 is prevented from coming off from the supported portion 23 of the hub 20 by the convex portion 232. Here, "the position in the circumferential direction of the concave portion 801 and the position in the circumferential direction of the convex portion 232 do not match" means that at least a part of the portion of the supported portion 81 in which the concave portion 801 is not formed is the convex portion 232. It means facing in the axial direction.

FIG. 6B shows a state in which the wheel 80 is rotated by 60 ° in the direction of arrow A in FIG. 6A from the state shown in FIG. 6A. In this state, the supported portion 81 is prevented from coming off from the supported portion 23 of the hub 20 by the convex portion 232, and the bolt insertion hole 810 of the supported portion 81 of the wheel 80 and the bolt insertion hole of the mounting portion 61 of the brake rotor 6 are prevented. The screw holes 220 of the 610 and the flange portion 22 of the hub 20 communicate with each other. In other words, in a state where the inner peripheral surface 800a of the central hole 800 and the convex portion 232 are aligned in the axial direction in the portion where the concave portion 801 is not formed, the plurality of screw holes 220 of the flange portion 22 and the brake rotor 6 The bolt insertion hole 610 and the bolt insertion hole 810 of the wheel 80 communicate with each other.

Then, in a state where the bolt insertion hole 810 of the wheel 80, the bolt insertion hole 610 of the brake rotor 6 and the screw hole 220 of the hub 20 are in communication with each other, the supported portion 81 of the wheel 80 is connected with the mounting portion 61 of the brake rotor 6. It is fixed to the flange portion 22 of the hub 20 by the hub bolt 100. As a result, the wheel 80 is attached to the hub 20.

(Effect of embodiment)
According to the embodiment described above, the supported portion 81 of the wheel 80 is prevented from coming off by the convex portion 232 of the support portion 23 of the hub 20, so that the wheel 8 can be prevented from coming off from the support portion 23 when the wheel 8 is attached. This makes it possible to easily fix the wheel 80 of the wheel 8 to the flange portion 22 of the hub 20 by the hub bolt 100.

(Additional note)
Although the present invention has been described above based on the embodiment, the embodiment does not limit the invention according to the claims. It should also be noted that not all combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

Further, the present invention can be carried out by appropriately modifying it by omitting a part of the configuration or adding or replacing the configuration within a range not deviating from the gist thereof. For example, in the above embodiment, the wheel bearing device 1 to which the wheel 8 is attached as the driving wheel to which the driving force is transmitted has been described as an example, but the wheel bearing device to which the driven wheel to which the driving force is not transmitted is attached. It is also possible to apply the present invention.

Further, in the above embodiment, the case where the flange portion 22 is provided with the six screw holes 220 and the wheel 80 of the wheel 8 is attached to the hub 20 by the six hub bolts 100 has been described. The number of holes 220 may be four or five. Further, in the above embodiment, the case where the number of the convex portion 232 in the support portion 23 and the number of the concave portions 801 in the supported portion 81 are three has been described, but the number of the convex portions 232 and the supported portion 81 is one. It may be one or two, or four or more.

1 ... Wheel bearing device 100 ... Hub bolt 2 ... Inner member 20 ... Hub 22 ... Flange part 220 ... Screw hole 23 ... Support part 231 ... Cylindrical part 231a ... Outer peripheral surface 232 ... Convex part 3 ... Outer member 41 ... Rolling element 8 ... Wheel 80 ... Wheel (wheel side member)
800 ... Central hole 800a ... Inner peripheral surface 801 ... Recessed portion 81 ... Supported part 810 ... Bolt insertion hole 91 ... Knuckle (vehicle body side member)

Claims (6)

It is arranged between the inner member to which the wheel side member having the supported portion having the central hole is formed is attached, the outer member fixed to the vehicle body side member, and the inner member and the outer member. Equipped with multiple rolling elements
The supported portion is formed with a recess that is recessed from the inner peripheral surface of the central hole in the radial direction.
The inner member has a flange portion for fixing the supported portion so as not to be relatively rotatable, and a support portion for fitting the supported portion to support the supported portion by fitting into the central hole, and the supporting portion. Is provided so as to project axially from the flange portion.
The support portion includes a cylindrical portion having an outer peripheral surface that fits into the inner peripheral surface of the central hole, and a convex portion that protrudes radially outward from the outer peripheral surface at one end of the cylindrical portion in the axial direction. Have,
In the wheel side member, the supported portion is arranged at an axial position between the flange portion and the convex portion, and a portion of the supported portion where the concave portion is not formed is locked by the convex portion. To prevent it from coming off from the support
Bearing device for wheels. The supported portion is supported by the supporting portion by inserting the cylindrical portion into the central hole in a state where the circumferential position of the concave portion coincides with the circumferential position of the convex portion.
In the support portion, the wheel side member is inward so that the position in the circumferential direction of the concave portion and the position in the circumferential direction of the convex portion do not match in a state where the cylindrical portion is inserted into the central hole. By rotating relative to the member, the supported portion is prevented from coming off by the convex portion.
The wheel bearing device according to claim 1. A plurality of the convex portions are provided on the support portion so as to be separated from each other in the circumferential direction.
A plurality of the recesses are provided in the supported portion so as to be separated from each other in the circumferential direction.
The wheel bearing device according to claim 1 or 2. Each of the flange portion and the supported portion is formed with a plurality of through holes through which bolts for fixing the supported portion to the flange portion are inserted so as to penetrate in the axial direction.
The plurality of through holes of the flange portion and the plurality of penetrations of the supported portion in a state where the inner peripheral surface of the central hole and the convex portion are aligned in the axial direction in the portion where the recess is not formed. Communicate with the hole,
The wheel bearing device according to any one of claims 1 to 3. It is a method of mounting a wheel for mounting a wheel side member to the inner member of a wheel bearing device in which a plurality of rolling elements are arranged between an inner member and an outer member.
The wheel-side member has a central hole and a supported portion in which a recess recessed from the inner peripheral surface of the central hole in the radial direction is formed.
The inner member has a flange portion for fixing the supported portion so as not to be relatively rotatable, and a support portion for fitting the supported portion to support the supported portion by fitting into the central hole, and the supporting portion. Is provided so as to project axially from the flange portion.
The support portion includes a cylindrical portion having an outer peripheral surface that fits into the inner peripheral surface of the central hole, and a convex portion that protrudes radially outward from the outer peripheral surface at one end of the cylindrical portion in the axial direction. Have,
After inserting the cylindrical portion into the central hole in a state where the circumferential position of the concave portion and the circumferential position of the convex portion are matched, the circumferential position of the concave portion and the circumferential direction of the convex portion The wheel side member is rotated relative to the inner member so as to be inconsistent with the position of, and the supported portion is prevented from coming off from the supported portion by the convex portion.
How to install the wheels. Each of the flange portion and the supported portion is formed with a plurality of through holes through which bolts for fixing the supported portion to the flange portion are inserted so as to penetrate in the axial direction.
The plurality of through holes of the flange portion and the plurality of through holes of the supported portion are communicated with each other in a state where the supported portion is prevented from coming off from the support portion by the convex portion, and the communicated state is described. The supported portion is fixed to the flange portion by the plurality of bolts.
The wheel mounting method according to claim 5.

Images