JP2001315502A - Hub unit for vehicle and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hub unit for a vehicle, capable of smoothly tilting a constant velocity universal joint by preventing the deformation of an outer ring of the constant velocity universal joint in a caulking process. SOLUTION: In this hub unit A2 for a vehicle where a double row rolling bearing 13 is mounted on an outer peripheral face of a hub wheel 11, a shaft part 26 continued from the outer ring 25 of the constant velocity universal joint 12 is mounted on an inner peripheral face of the hub wheel, and a cylindrical part 34 having a caulking part 22 radially outwardly bent to an axial outer end side to be caulked to an axial outer edge face of the hub wheel, is mounted on the shaft part 26, a face 33 on which a caulking receiving jig is placed for receiving the caulking load in caulking, is mounted on an region axially opposite to the applying direction of the caulking load in caulking on the inner peripheral face of the outer ring of the constant velocity universal joint.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a double-row rolling bearing on an outer peripheral surface of a hub wheel, and a shaft portion connected to an outer ring of a constant velocity joint on an inner peripheral surface of the hub wheel. A disk rotor of a disk brake device or a wheel is applied to an outer surface of a radially outward flange formed integrally with an axially outer end portion of the wheel, and is located on a shaft portion side of an outer ring outer peripheral surface of the constant velocity joint. A receiving surface for receiving the double-row rolling bearing in the axial direction is provided at an end of the hub wheel, and an axially outer end surface of the hub wheel is bent radially outward toward an axially outer end side at a shaft portion of the constant velocity joint. TECHNICAL FIELD The present invention relates to a vehicle hub unit provided with a cylindrical portion that is crimped against a vehicle, and a method for manufacturing the same.

[0002]

2. Description of the Related Art A conventional hub unit used on the driving wheel side of a vehicle of this type will be described with reference to FIG. The vehicle hub unit A1 includes: a hub wheel 11;
The vehicle includes a constant velocity joint 12 and a double row rolling bearing 13.

The hub wheel 11 has a radially outward flange 14 at an axially outer end, and a disk rotor 17 and wheels (not shown) are mounted on the outer surface of the flange 14.

The constant velocity joint 12 has a cylindrical shaft portion 26 provided on an outer race 25, and the outer peripheral surface of the cylindrical shaft portion 26 is spline-fitted to the inner peripheral surface of the hub wheel 11, while the shaft of the cylindrical shaft portion 26 is The outer end in the direction is a caulking cylindrical portion 34, and the caulking cylindrical portion 34 is bent and deformed radially outward on the axial outer end surface of the hub wheel 11 to form the caulking portion 22, thereby forming a hub. It is integrated with the wheel 11.

The double row rolling bearing 13 includes a single outer ring 19 having two rows of raceways, a plurality of balls 20 arranged in two rows,
The outer peripheral surface of the hub wheel 11 has one inner ring, and the outer peripheral surface of the constant velocity joint 12 has the other inner ring.
By pressing the two inner rings from 2, a required preload (compressive stress) is applied and the inner ring is prevented from coming off.

The caulking operation will be described with reference to FIG.

First, the hub unit A1 is placed on the base 40, and the caulking jig 42 is pressed down with a required caulking force while being rolled at a predetermined rolling angle θ with respect to the center O. The caulking cylindrical portion 34 is bent radially outward on the axially outer end surface of the hub wheel 11 to form the caulking portion 22.

As a result, a preload is applied from the caulked portion 22 after caulking to the outer peripheral surfaces of the hub wheel 11 and the constant velocity joint 12 which are the inner race of the double row rolling bearing 13. In this case, the preload is applied to the double row rolling bearing 1 from the inner ring.
The third ball 20 acts as an axial force (axial load) on the ball 20, and the ball 20 can appropriately roll between the outer ring 19 and the inner ring with the outer ring 19 and the inner ring compressed.
The axial force in this case amounts to several tons.

[0009]

However, in the case of the structure of the conventional vehicle hub unit A1, the outer ring 25 of the constant velocity joint 12 may be deformed due to the caulking. Such deformation distortion of the outer race 25 is not preferable because it may hinder the tilting operation. Therefore, the present applicant has conducted intensive research on the elimination of such distortion in the outer race 25 of the constant velocity joint 12. As a result, the vehicle hub unit support region was located radially outward with respect to the direction of action of the caulking load P1. In this case, the vehicle hub unit support region is a contact point 40 a of the base 40 with the outer ring 25 of the constant velocity joint 12.

Since a reaction force P2 corresponding to the caulking load P1 is generated in the vehicle hub unit support area,
A couple is generated on the outer ring 25 of the constant velocity joint 12 so as to deform the outer ring 25.
It was found that the outer ring 25 of No. 2 was distorted and deformed.

Accordingly, it is an object of the present invention to provide a vehicle hub unit capable of preventing deformation of a constant velocity joint in the process of caulking.

[0012]

(1) In a hub unit for a vehicle according to the present invention, a double-row rolling bearing is provided on an outer peripheral surface of a hub wheel, and a shaft connected to an inner peripheral surface of a hub wheel from an outer ring of a constant velocity joint. The constant velocity joint is provided in a state in which a disc rotor or a wheel of a disc brake device is applied to an outer surface of a radially outwardly facing flange integrally formed at an axially outer end portion of the hub wheel. A receiving surface for receiving the double row rolling bearing from the axial direction is provided at an end located on the shaft portion side of the outer ring outer peripheral surface of the outer ring, and is bent radially outward to the axial outer end side at the shaft portion of the constant velocity joint. A hub unit for a vehicle provided with a cylindrical portion which is formed and caulked against an axially outer end surface of the hub wheel, wherein the caulking load at the time of the caulking is applied to the inner peripheral surface of the outer ring of the constant velocity joint. Directly opposite to the region in the axial direction with respect to the direction of action, the crimping receiving surface jig is Ategawa for receiving a caulking load are provided at the time of caulking.

According to the present invention, in the outer ring of the constant velocity joint, a caulking receiving jig for receiving the caulking load at the time of caulking is applied to a region facing the working direction of the caulking load at the time of caulking in the axial direction. Because the surface is provided, the direction of action of the caulking load and the direction of the reaction force to the caulking load on the caulking receiving jig almost match in the axial direction, so that the couple due to the caulking is applied to the outer ring of the constant velocity joint. As a result, the outer ring of the constant velocity joint does not become distorted due to the caulking, and the constant velocity joint can be smoothly tilted, which is preferable.

The vehicle hub unit according to the present invention is preferably such that the double row rolling bearing has a single outer ring having two rows of raceway grooves, a plurality of rolling elements disposed in two rows, and the hub. The outer peripheral surface of the wheel has one inner ring, and the outer peripheral surface of the outer ring of the constant velocity joint has the other inner ring. The constant velocity joint reinforces the hollow inner surface at a position corresponding to between the two rows of rolling elements. It has a reinforced wall for

According to this embodiment, since the reinforcing wall is located between the rolling element rows of the double row rolling bearing, the strength can be effectively prevented from being reduced when the constant velocity joint is made hollow to reduce the weight. Even if a static or dynamic load is applied to the outer ring from the vehicle body, deformation of the constant velocity joint can be prevented, which is preferable.

In the vehicle hub unit of the present invention, preferably, a load receiving member for receiving a load for deforming the outer ring radially inward at the time of the caulking is provided on the inner surface of the cylindrical portion of the constant velocity joint. Is provided.

According to this embodiment, when the cylindrical portion is bent radially outwardly on the axially outer end surface of the hub wheel and is to be swaged, a radially inward load acting on the outer ring is received by the load. Since it can be received by the member, it is preferable because the spline fitting state between the outer peripheral surface of the outer race of the constant velocity joint and the inner peripheral surface of the hub wheel can be favorably maintained.

In the hub unit for a vehicle according to the present invention, preferably, the load receiving member is formed in a lid shape for closing a free end side opening of the cylindrical portion to prevent foreign matter from entering the inside of the constant velocity joint. ing.

According to this embodiment, the lid-shaped load receiving member is preferable because foreign substances can be prevented from entering the inside of the constant velocity joint.

(2) In the method for manufacturing a vehicle hub unit according to the present invention, the cylindrical portion of the constant velocity joint is caulked to the axially outer end surface of the hub wheel with the load receiving member applied to the inner surface of the cylindrical portion. Do.

According to the method of manufacturing a vehicle hub unit of the present invention, when the cylindrical portion of the constant velocity joint is bent radially outward on the axially outer end face of the hub wheel to be caulked, it acts on the outer ring. It is preferable to be able to maintain the spline fitting condition between the outer peripheral surface of the outer race of the constant velocity joint and the inner peripheral surface of the hub wheel even after the caulking because the radial inward load is received by the load receiving member. .

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described based on embodiments shown in the drawings.

FIG. 1 and FIG. 2 show an embodiment of the present invention. FIG. 1 is a longitudinal side view of a vehicle hub unit,
FIG. 2 is a diagram for explaining a method of caulking the vehicle hub unit, and portions corresponding to FIG. 8 and FIG. 9 are denoted by the same reference numerals.

The illustrated vehicle hub unit A2 includes a hub wheel 11, a constant velocity joint 12, and a double row rolling bearing 13.

The hub wheel 11 has a radially outward flange 14 at an axially outer end. Bolt insertion holes 15 are formed in several places on the circumference of the flange 14. A bolt 16 is inserted into each bolt insertion hole 15 in a penetrating state. A disk rotor 17 and wheels (not shown) of the disk brake device are mounted in a state of being arranged along one surface of the flange 14 via bolts 16. 18
Is a brake pad.

The double-row rolling bearing 13 comprises a single outer ring 19 having two rows of raceways, a plurality of balls 20 as rolling elements arranged in two rows, two crown cages 21, and a hub wheel 1.
1 has an outer ring as one inner ring, and an outer peripheral surface of the constant velocity joint 12 as the other inner ring. A required preload (compressive stress) is given by the inner ring being pressed from the caulking portion 22, And it is locked. Further, a flange 23 is formed on the outer ring 19 of the double row rolling bearing 13,
The flange 23 is bolted to the vehicle body 24.

The constant velocity joint 12 is a so-called CVJ (Constant Velocity Joint), which is an outer ring 25, a cylindrical shaft portion 26, an inner ring 27, a ball 28,
One end of the drive shaft 30 is spline-fitted to the inner ring 27 and a retaining ring 31 is provided.
It is fixed by retaining etc. Drive shaft 30
Is attached to a differential device of the vehicle via another constant velocity joint.

A receiving surface 25a for receiving the double row rolling bearing 13 from the axial direction is provided at an end of the outer peripheral surface of the constant velocity joint 12 located on the shaft portion 26 side. The cylindrical shaft portion 26 connected to the outer race 25 of the constant velocity joint 12 is spline-fitted to the inner peripheral surface of the hub wheel 11 over a predetermined length in the axial direction. A caulking portion 22 is formed by being bent radially outward with respect to the axially outer end surface of the wheel 11 to form a caulking portion 22, thereby being integrated with the hub wheel 11.

With the above structure, the rotational power of the drive shaft 30 is transmitted to the wheels (not shown) attached to the hub wheel 11 via the constant velocity joint 12.

A reinforcing wall 32 for closing and reinforcing the inner surface of the constant velocity joint 12 is provided between the outer ring 25 of the constant velocity joint 12 and the cylindrical shaft portion 26. The reinforcing wall 32 is located between the two rows of the rolling elements 20 of the double row rolling bearing 13 and prevents a reduction in strength due to the hollow cylindrical portion 26 of the constant velocity joint 12.

The hub unit A2 for a vehicle according to the embodiment applies the caulking load to the region on the inner peripheral surface of the outer race 25 of the constant velocity joint 12 in the axial direction facing the direction of the caulking load at the time of caulking. An application surface 33 to which a caulking receiving jig 41 for receiving is applied is formed. The application surface 33 is flat in the radial direction.

Next, the caulking operation will be described with reference to FIG.

In this caulking operation, the axially outer end of the cylindrical shaft portion 26 of the constant velocity joint 12 is bent radially outward so as to press against the axially outer end surface of the hub wheel 11 as a caulking cylindrical portion 34. Caulking and caulking part 2
By setting 2, the double row rolling bearing 13 is prevented from coming off and preload is applied.

For this purpose, first, the caulking jig 41 is placed on the base 40, and the vehicle hub unit A2 is mounted on the caulking jig 41. In this case, the caulking receiving jig 41 has a mounting surface that matches the outer dimensions of the fitting surface 33, and also allows the vehicle hub unit A2 to float from the base 40 with the vehicle hub unit A2 mounted. It has become.

With this mounting, the mounting surface 41a of the mounting surface of the caulking receiving jig 41, in particular, which comes into contact with the application surface 33, is applied to the application surface 33. This mounting surface 4
1a is a support area of the vehicle hub unit A2.

Note that the caulking receiving jig 41 may have a cylindrical shape, a cylindrical shape, a truncated cone shape, or other shapes as long as it has a region facing the axial direction of the caulking load.

Then, on the mounting surface 41a of the caulking receiving jig 41, the fitting surface 33 of the vehicle hub unit A2 is placed.
When the caulking jig 42 is rolled at a predetermined rolling angle θ with respect to the center O while applying the caulking force P while the caulking jig 42 is placed, the caulking cylindrical portion 34 is bent and deformed radially outward. At this time, the acting direction of the caulking load P2 acting on the caulking cylindrical portion 34 is directed to the mating surface 33 which is opposed to the caulking load P2 in the axial direction. In this case, the application surface 33
Is supported by the mounting surface 41a of the caulking receiving jig 41, the reaction force P2 on the mounting surface 41a substantially coincides with the caulking load P1 in the axial direction.
2 does not generate a couple at the time of caulking as in the prior art. Here, the application surface 33 is a vehicle hub unit support region, and the caulking load acting region is not displaced radially inside or outside the vehicle hub unit support region.

At the time of this caulking, the outer race 25 of the constant velocity joint 12 is floated from the base 40 by the caulking receiving jig 41, so that the conventional reaction force is not applied. Deformation is prevented.

Therefore, according to the caulking method of the embodiment,
As the outer ring 25 of the constant velocity joint 12 is swaged, a couple for deforming the outer ring 25 does not act. Therefore, since the deformation of the outer race 25 of the constant velocity joint 12 does not occur, the tilting operation of the constant velocity joint 12 is smooth, which is preferable.

The present invention is not limited to the above embodiment, and various applications and modifications are conceivable.

(1) Another embodiment of the present invention will be described with reference to FIGS.

Here, FIG. 3 is a side sectional view of a main part of the hub unit at the time of caulking.

4 to 6 show another embodiment of the present invention. FIG. 4 is a longitudinal sectional side view of a hub unit.
FIG. 5 is a perspective view of the spacer of FIG. 4, and FIG. 6 is a vertical sectional side view of the hub unit of FIG. 4 for explanation of caulking.

In these figures, parts corresponding to those in FIGS. 1 and 2 are denoted by the same reference numerals.

When the cylindrical portion 34 provided at the axially outer end of the cylindrical shaft portion 26 of the outer ring 25 of the constant velocity joint 12 is bent radially outward on the axially outer end surface of the hub wheel 11 and swaged, As shown in FIG. 3, a load is applied to the inner surface of the cylindrical shaft portion 26 so as to deform it inward in the radial direction, and the inner surface may be deformed as indicated by a virtual line. Such deformation is not preferable because the spline fitting state between the outer peripheral surface of the cylindrical shaft portion 26 and the inner peripheral surface of the hub wheel 11 becomes loose.

Therefore, in this embodiment, a disk-shaped spacer 41 shown in FIG. 5 is fixed to the inner surface of the cylindrical portion 34 as a load receiving member by press-fitting, caulking, spot welding, or the like, and the spacer 41 can receive the load. Like that.

The spacer 41 is attached to the cylindrical portion 34.
When the cylindrical portion 34 is swaged against the axially outer end surface of the hub wheel 11 in a state where the cylindrical shaft portion 26 is in contact with the inner surface of the cylindrical shaft portion 26 as shown in FIG.
On the other hand, even if a radially inward load is applied to deform the cylindrical shaft portion inward, the load is received by the spacer 41. As a result, the deformation of the inner surface of the cylindrical shaft portion 26 is suppressed.

As a result, the required spline fitting state between the outer peripheral surface of the cylindrical shaft portion 26 of the constant velocity joint 12 and the inner peripheral surface of the hub wheel 11 is favorably maintained.

The spacer 41 may be fixed as it is, or may be detachable from the cylindrical shaft 26, as shown in FIG.

The spacer 41 does not necessarily have to be disk-shaped, but may be annular.

The annular or disk-shaped constant velocity joint 12
Although it is most preferable because it can be fixed by contacting the entire inner peripheral surface of the cylindrical portion 34, it is not always necessary to make contact with the entire inner peripheral surface of the cylindrical portion 34, and the outer peripheral shape of the spacer 41 is square, or circular or square. Mixed shape, cylindrical part 3
It may be in the form of contact with a plurality of points with respect to 4.

(2) FIG. 7 is a longitudinal sectional side view of a hub unit according to still another embodiment of the present invention. 7, parts corresponding to those in FIG. 1 are denoted by the same reference numerals.

In the embodiment shown in FIGS. 4 to 6, the cylindrical shaft 26 of the constant velocity joint 12 has a reinforcing wall 32 for reinforcing the same.
A function of preventing a reduction in strength due to the hollow cylindrical shaft portion 26 being provided.

Further, the reinforcing wall 32 also functions as a lid for closing the free end side opening of the cylindrical portion 34 of the constant velocity joint 12, so that foreign matters such as rainwater and dust mainly enter the inside, and The sealing performance can be ensured by preventing the oil in the joint 12 from leaking to the outside.

For such a hub unit, the reinforcing wall 32 is omitted, and instead, as shown in FIG. 7, a spacer 41 is provided in the inner surface of the cylindrical shaft portion 26 at the time of caulking similarly to the above (1). And a cylindrical portion 34 of the constant velocity joint 12.
The cover may also be used as a lid for closing the free end side opening to prevent the foreign matter from entering and prevent oil from leaking outside.

The material of the spacer 41 is preferably a zinc alloy as the load receiving member, and particularly preferably an aluminum alloy.

The spacer 41 may be made of a non-ferrous material having excellent thermal conductivity and a certain strength, for example, an aluminum alloy or a zinc alloy to provide heat radiation.

[0058]

According to the present invention, when the cylindrical portion on the axially outer end side of the outer race of the constant velocity joint is bent radially outward and caulked to the axially outer end surface of the hub wheel,
In the outer ring of the constant velocity joint, a surface to which a caulking jig for receiving the caulking load at the time of caulking is provided in the area facing the working direction of the caulking load at the time of caulking. Since the outer ring of the constant velocity joint does not act on the couple due to the caulking operation and is prevented from being deformed, the constant velocity joint is preferable because there is no hindrance to the tilting operation due to the deformation of the outer ring due to the caulking unlike the conventional art.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a hub unit according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional side view of the hub unit of FIG. 1 for explanation of caulking.

FIG. 3 is a cross-sectional view of a main part of a hub unit for explaining another embodiment of the present invention.

FIG. 4 is a longitudinal sectional side view of a hub unit according to another embodiment of the present invention.

FIG. 5 is a perspective view of the spacer of FIG. 4;

FIG. 6 is a longitudinal sectional side view of the hub unit of FIG. 4 for explanation of caulking.

FIG. 7 is a longitudinal sectional side view of a hub unit according to still another embodiment of the present invention.

FIG. 8 is a longitudinal sectional side view of a hub unit according to a conventional example.

FIG. 9 is a longitudinal sectional side view of the hub unit of FIG. 8 for explanation of caulking.

[Explanation of symbols]

 A2 Vehicle hub unit 11 Hub wheel 12 Constant velocity joint 13 Double row rolling bearing 14 Flange 17 Disk rotor 22 Caulking part 26 Cylindrical shaft part 32 Reinforcement wall 33 Fitting surface 34 Caulking cylindrical part 41 Spacer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Shinichiro Kashiwagi 3-5-8 Minamisenba, Chuo-ku, Osaka-shi Inside Koyo Seiko Co., Ltd. (72) Inventor Tadashi Tadashi 3-5-8 Minamisenba, Chuo-ku, Osaka-shi Koyo Seiko (72) Inventor: Satoshi Araki 3-5-8 Minamisenba, Chuo-ku, Osaka-shi Koyo Seiko Co., Ltd.

Claims (5)

[Claims] 1. A double row rolling bearing is provided on an outer peripheral surface of a hub wheel, and a shaft portion connected to an outer ring of a constant velocity joint is disposed on an inner peripheral surface of the hub wheel. With the disc rotor and the wheel of the disc brake device applied to the outer surface of the radially outward flange integrally formed with the portion, the above-mentioned double A receiving surface for receiving the row rolling bearing from the axial direction is provided, and the shaft portion of the constant velocity joint is bent radially outward toward the axially outer end side and caulked against the axially outer end surface of the hub wheel. A vehicular hub unit provided with a cylindrical portion, wherein a region on the inner peripheral surface of the outer ring of the constant velocity joint, which is axially opposed to a direction in which a caulking load is applied at the time of caulking, is provided. Surface crimping receiving jig is Ategawa for receiving Oite caulking load are provided, the vehicle hub unit, characterized in that. 2. The vehicle hub unit according to claim 1, wherein the double-row rolling bearing has a single outer ring having two rows of raceway grooves, a plurality of rolling elements arranged in two rows, and the hub. The outer peripheral surface of the wheel has one inner ring, and the outer peripheral surface of the outer ring of the constant velocity joint has the other inner ring. The constant velocity joint reinforces the hollow inner surface at a position corresponding to between the two rows of rolling elements. A hub unit for a vehicle, comprising: a reinforcing wall for performing the operation. 3. The vehicle hub unit according to claim 1, wherein a load is applied to an inner surface of the cylindrical portion of the constant velocity joint wheel so as to deform the outer ring radially inward during the caulking. A vehicle hub unit provided with a load receiving member. 4. The vehicle hub unit according to claim 3, wherein the load receiving member is formed in a lid shape for closing a free end side opening of the cylindrical portion to prevent foreign matter from entering the inside of the constant velocity joint. A hub unit for a vehicle. 5. The method for manufacturing a vehicle hub unit according to claim 1, wherein the cylindrical portion of the constant velocity joint is caulked to an axially outer end surface of the hub wheel with a load receiving member applied to the inner surface of the cylindrical portion. And a method of manufacturing a vehicle hub unit.