JP2002021864A - Caulking method for bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control deformation of inner ring raceway during a caulking operation. SOLUTION: This invention relates to a method of deforming a cylindrical shaft end 6 of a shaft part 3 of a bearing device provided with a bearing 2 in a radially outer direction by applying and rolling a caulking jig 13 on the cylindrical shaft end 6 to caulk the same on an outer end surface of an inner ring 8 of the bearing 2. A range of caulking jig rolling angles α is set at most 10 degrees to provide a good caulking quickly while controlling deformation of an inner ring raceway.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caulking method for a bearing device such as a vehicle hub unit which is attached to a vehicle such as an automobile.

[0002]

2. Description of the Related Art A vehicle hub unit as an example of a bearing device to which a conventional caulking method of this type is applied has a hub wheel and an angular ball bearing which is provided at an axially intermediate portion of the hub wheel. There is a hub wheel having a radially outward mounting flange for mounting a disk rotor or a wheel of a disk brake device on the outer periphery of one hub end side on one shaft end side, and a cylindrical shaft end structure on the other shaft end.

[0003] In such a caulking method for a vehicle hub unit, a caulking tool is applied to a cylindrical shaft end of the shaft body and rolling is performed at a fixed rolling angle to deform the cylindrical shaft end radially outward. By caulking the outer end surface of the inner ring of the angular contact ball bearing, a required compressive stress is applied to the inner ring to prevent the inner ring from coming off.

[0004]

In the prior art, the rolling angle was set to be larger than 10 degrees in order to speed up the caulking process. Therefore, when rolling caulking, a considerably large caulking force was applied to the inner ring, and the inner ring raceway was reduced. It has been found that the roundness tends to decrease due to the deformation. Such a disadvantage is disadvantageous in performing high-quality staking to improve mass productivity and reduce costs of the bearing device.

Accordingly, the present invention provides a method for caulking a bearing device such as a hub unit for a vehicle, which enables high-quality caulking to suppress deformation of an inner ring raceway, thereby improving mass productivity and reducing a strike of the bearing device. The challenge is to

[0006]

SUMMARY OF THE INVENTION According to the first and second methods of caulking a bearing device according to the present invention, the range of the rolling angle of a caulking device is set to 10 degrees or less, thereby suppressing deformation of an inner raceway. This makes it possible to carry out the caulking with a caulking tool, whereby high-quality caulking of the outer end surface of the inner ring can be performed quickly, thereby improving the mass productivity of the bearing device and reducing its cost.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below based on embodiments shown in the drawings. In this embodiment, a vehicle hub unit is applied as the bearing device, but the present invention is not limited to this vehicle hub unit.

Referring to FIGS. 1 to 4, a method of caulking a hub unit for a vehicle according to an embodiment of the present invention will be described. Here, the vehicle hub unit is of a type to which a driven wheel is attached.

FIG. 1 is a longitudinal sectional side view of the vehicle hub unit before the caulking operation, FIG. 2 is a longitudinal side view of the vehicle hub unit after the caulking operation, and FIG. 3 is a view of the vehicle hub unit during the caulking operation. 4 (a) and 4 (c) are views corresponding to the same main parts in FIGS. 1 and 2, respectively, and FIG. 4 (b) is a view corresponding to the main parts in FIG.

Referring to FIG. 1 and FIG. 2, a vehicle hub unit A in the illustrated example has a hub wheel 1 and a double-row outwardly directed angular ball bearing 2. Hub wheel 1
Has a shaft portion 3 whose outer diameter on one shaft end side is larger than the outer diameter on the other shaft end side. A radially outward mounting flange 5 is formed on one large-diameter end of the shaft portion 3, and a cylindrical shaft end 6 is formed on the other small-diameter shaft end.

A double-row outwardly-directed angular ball bearing 2 is disposed as an example of an oblique contact type rolling bearing on the outer periphery of the shaft portion 3 at an intermediate position in the axial direction.

Bolt insertion holes 5a are formed at several places around the circumference of the mounting flange 5 in the shaft portion 3, and bolts are inserted into the respective bolt insertion holes 5a in a penetrating state. A disc rotor and wheels of a disc brake device (not shown) are detachably attached to the small-diameter cylindrical portion 4 via these bolts along the one surface of the attachment flange 5.

The angular ball bearing 2 includes a single inner race 8 having a single raceway fitted to the small-diameter outer peripheral surface of the shaft portion 3, a single outer race 9 having two rows of raceways, and two rows. A plurality of balls 10 and two crown-shaped retainers 11 are provided, and the large-diameter outer peripheral surface of the shaft portion 3 is configured as the other inner ring having a single track. The inner ring 8 uses the inner ring of a general single-row angular contact ball bearing as it is. In addition, on the outer periphery of the outer ring 9, a radially outwardly directed annular flange 1 is provided.
2, and is non-rotatably attached to an axle case (not shown) via the annular flange 12.

In this hub unit, the shaft end 6 of the shaft portion 3 is deformed radially outward from the axial state of FIG. The crimping method according to the present embodiment will be described with reference to FIGS. 3 and 4 in which the inner ring 8 is crimped as shown in FIG. .

First, the inner peripheral corner 8a of the end face of the inner race 8 on the side opposite to the counterbore is chamfered from the center O of the arc at a quarter of the radius of curvature r.

The shaft end 6 of the shaft portion 3 is bent outward in the radial direction toward the counter-bore-side end surface of the inner ring 8 with the chamfering start point at the inner peripheral corner portion 8a serving as a bending start point 8a1.

The bending angle (β) of the shaft end 6 of the shaft portion 3 with respect to the end surface of the inner ring 8 on the side opposite to the counter bore is the angle from the bending start point 8a1 with respect to the arc center O.

The rolling angle (α) of the caulking device 13 is
The inclination angle of the caulking device 13 from around the axial center line L of the shaft portion 3.

In the drawing, only the columnar structure of the lower half of the caulking device 13 is shown, and the annular concave surface 13a is
In the lower surface structure of the columnar structure, the lower surface structure is composed of an arc-shaped inner annular surface and a radially flat outer annular surface connected thereto, and the inner diameter is smaller than that of the shaft end 6 of the shaft portion 3. It is possible to apply to the inner diameter side of the shaft end 6 of the shaft portion 3 before caulking.

First, the vehicle hub unit A is mounted on the base 14 via the jig 15 and the vehicle hub unit A is fixed in an immobile state.

Then, the caulking device 13 is rolled while the annular concave surface 13a of the caulking device 13 is applied to the shaft end 6 of the shaft portion 3.

In this case, the present inventors set the rolling angle (α) to 10 degrees or less and performed rolling caulking under the conditions corresponding to the following bending angle (β).

(1) When the bending angle (β) reaches 0 to 45 degrees [from FIG. 4 (a) to FIG. 4 (b)]: Rolling angle in the range of this bending angle (β) When (α) is set to less than 5 degrees, the shaft portion 3 buckles and a radial gap is generated between the inner ring 8 and the shaft portion 3. When the rolling angle (α) is set to 10 degrees or more, Inner ring 8
The orbit was deformed.

Therefore, when the range of the rolling angle (α) is set to 5 degrees or more and 10 degrees or less until the bending angle (β) reaches 0 to 45 degrees, the distance between the inner ring 8 and the shaft portion 3 is changed. No generation of a radial gap was observed, and no deformation was observed in the track of the inner ring 8.

(2) When the bending angle (β) is 4
After 5 degrees [FIGS. 4 (b) to 4 (c)]: When the rolling angle (α) is set to less than 1 degree in the range of the bending angle (β), the shaft 3 Buckling occurred, and a radial gap was observed between the inner ring 8 and the shaft portion 3. When the rolling angle (α) was set to 5 degrees or more, the track of the inner ring 8 was deformed. Therefore, the bending angle (β) is 4
In the process of increasing beyond 5 degrees, when the range of the rolling angle (α) is set to 1 degree or more and less than 5 degrees, no radial gap is observed between the inner ring 8 and the shaft 3, and No deformation was observed in the trajectory of the inner ring 8.

Therefore, in the case of the present embodiment, the range of the rolling angle (α) of the caulking device 13 is determined by the above (1).
As described in (2), the angle is set to 5 degrees or more and 10 degrees or less until the bending angle (β) reaches 45 degrees or less, and 1 degree when the bending angle (β) exceeds 45 degrees. When the angle is set to less than 5 degrees as described above, deformation of the inner ring 8 track can be suppressed, mass productivity of the vehicle hub unit A can be improved, and the cost can be reduced.

Note that the present invention is not limited to the above-described embodiment, and various modifications and applications are possible.

(1) In each of the above embodiments, the bearing is a double-row outward-facing angular ball bearing. However, the present invention is not limited to this. The bearing may be an oblique contact type rolling bearing. Absent.

(2) The embodiment described above is not limited to a vehicle hub unit comprising a combination of a hub wheel and an angular ball bearing. The caulking method of the embodiment can also be applied to a bearing device in which a contact type rolling bearing is disposed on the outer periphery of a shaft portion of the shaft body.

[0030]

As described above, according to the present invention, the range of the rolling angle of the caulking tool is set to 10 degrees or less, so that the caulking can be performed quickly while suppressing the deformation of the inner raceway. In addition, high quality staking becomes possible,
As a result, the mass productivity of the bearing device can be improved and the cost can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal side view of the vehicle hub unit after the caulking operation.

FIG. 3 is a longitudinal sectional side view of a vehicle hub unit for explaining a caulking operation.

FIG. 4 is a sectional view of a main part of a vehicle hub unit for explaining a caulking operation.

[Description of Signs] 1 Hub wheel 2 Angular contact ball bearing 3 Shaft portion 6 Shaft end of shaft portion 8 Inner ring 8a Inner peripheral corner portion of inner ring 8a1 Bending start point

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinichiro Kashiwagi 3-5-8 Minamisenba, Chuo-ku, Osaka City Inside Koyo Seiko Co., Ltd. (72) Inventor Tadashi Tadashi 3-5-8 Minamisenba, Chuo-ku, Osaka City Koyo Seiko Incorporated F term (reference) 3J017 AA02 BA10 DB08 3J101 AA02 AA32 AA43 AA54 AA62 AA72 BA77 DA20 FA60 GA03

Claims (3)

[Claims] 1. A cylindrical bearing in which a rolling bearing is disposed on the outer periphery of a shaft portion having a cylindrical shaft end, a caulking tool is applied to the cylindrical shaft end to roll the cylindrical shaft end radially outward. A method for crimping a bearing device by bending and crimping the outer end surface of an inner ring of a rolling bearing, wherein a range of a rolling angle of the crimping tool is set to 10 degrees or less. 2. In a bearing device in which double-row outwardly-directed angular ball bearings are arranged on the outer periphery of a hub wheel having a cylindrical shaft end, said cylindrical shaft end is rolled by applying a jig to said cylindrical shaft end. A method in which a shaft end is bent radially outward and crimped to an end face on a counter counterbore side of an angular ball bearing, wherein a range of a rolling angle of the crimping tool is set to 10 degrees or less. Method of swaging bearing device. 3. The bearing device according to claim 1, wherein the range of the rolling angle is managed from 5 degrees or more to 10 degrees or less from the start of swaging until the bending angle reaches 45 degrees. In the following, a method for caulking a bearing device, wherein the temperature is controlled to be 1 degree or more and less than 5 degrees.