JP2000087977A - Bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the slipping off resistance by a caulked part by devising a shape of an outer end face of the caulked part. SOLUTION: In a bearing device A in which a rolling bearing 2 is prevented from slipping off and fixed by caulking a free end of a shaft body 1 with the rolling bearing 2 externally fitted thereto, a tapered surface 3a is formed in an area W from the middle position in the radial direction to an outer circumferential edge in an outer end face of a caulked part 3. To obtain the caulked part of this shape, the caulked part is strongly pressed to an internal ring 21 side from the middle part in the radial direction of the caulked part 3 through an outer circumferential edge side when caulking the free end of the shaft body 1. The outer circumferential edge side of the caulked part 3 becomes easy to closely attach to an outer end face of the inner ring 21, and difficult to elastically return.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device in which a rolling bearing is mounted on a shaft.

[0002]

2. Description of the Related Art As an example of this type of conventional bearing device,
There is a vehicle hub unit as shown in FIG.

In the illustrated vehicle hub unit B, a double-row outwardly angular contact ball bearing 82 is externally fitted to a shaft portion 81 of a hub wheel 80 as a shaft body, and the free end of the shaft portion 81 is subjected to rolling caulking. Swell and deform radially outward,
By pressing the swollen and swaged portion 85 against the outer end surface of the inner ring 84 of the bearing 82, the hub wheel 8
The bearing 82 is fixed at 0 to prevent it from falling off.

The shape of the shaft portion 81 of the hub wheel 80 before caulking has a uniform outer diameter at each position in the axial direction, as shown by a virtual line in the figure. The free end of the shaft portion 81 is rolled and caulked using a caulking jig 90 as shown in FIG. At this time, the tip of the caulking jig 90 is applied to the shaft portion 81, and the caulking jig 90 is rolled around the dashed line O. As a result, the free end of the shaft portion 81 is swelled and deformed outward in the radial direction, and the inner ring 84 is prevented from falling off by the swaged caulked portion 85.

[0005]

In the above conventional example, the outer end face of the caulked portion 85 is formed in a rounded shape. However, in such a caulked form, the outer peripheral side of the caulked portion 85 becomes stronger on the inner ring 84 side. It can be said that it is pressing to.
However, it cannot be said that the radially intermediate portion of the caulking portion 85 is pressed too strongly against the inner ring 84 side. With such a shape of the caulking portion 85, in a severe case, there is a concern that a phenomenon that the caulking portion 85 returns after the caulking occurs and a phenomenon that the outer peripheral edge side separates from the inner ring 84 is generated. Shortage is likely to result.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve the pull-out drag of a caulked portion in a bearing device.

[0007]

According to a first aspect of the present invention, there is provided a bearing device in which a rolling bearing is externally fitted to a shaft, and the free end of the shaft is radially outwardly deformed by rolling caulking. Then, the swollen and deformed caulked portion is pressed against the outer end surface of the inner ring of the rolling bearing to fix the rolling bearing to the shaft body, and is fixed from the radially intermediate position of the caulked portion to the outer peripheral edge. By setting the thickness dimension of the region to be gradually thinner toward the outer peripheral edge side, the outer end surface of the region of the caulked portion is formed into a tapered surface, and the angle formed between the tapered surface and a plane along the radial direction is formed. 30-45
It is set in the range of degrees.

The caulking portion of the present invention has a unique shape obtained by strongly pressing the inner ring side from the radially intermediate portion of the caulking portion to the outer peripheral side when caulking. Can easily be brought into close contact with the outer end surface of the inner ring, so that the return phenomenon hardly occurs. For this reason, it becomes possible to prevent the outer peripheral edge side of the caulked portion from separating from the inner ring side, and it is possible to increase the pull-out resistance as compared with the conventional example.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described based on embodiments shown in the drawings. Here, a vehicle hub unit will be described as an example of the bearing device.

FIGS. 1 and 2 relate to an embodiment of the present invention. FIG. 1 is a longitudinal sectional side view of a vehicle hub unit.
FIG. 2 is a process diagram for explaining a caulking mode.

In the figures, A indicates the entire vehicle hub unit as a bearing device, 1 is a hub wheel as a shaft, 2 is a double row outward angular ball bearing as a rolling bearing, and 3 is a caulking portion. It is.

The hub wheel 1 is provided with an annular plate portion 11 to which wheels (not shown) are attached, and a double-row outward-facing angular ball bearing 2, and for fixing the double-row outward-facing angular ball bearing 2 to the shaft end. A shaft portion 12 on which the caulking portion 3 is formed.

The double-row outward-facing angular contact ball bearing 2 comprises a shaft 1
An inner ring 21 having a single race fitted to the outer peripheral surface 12a of two small diameters, a single outer race 22 having two rows of race grooves, a plurality of balls 23 arranged in two rows, and two crowns Shape holder 2
4 and 25, and the large-diameter outer peripheral surface 12b of the shaft portion 12 of the hub wheel 1 described above is used as one inner ring. A radially outward flange 26 is provided on the outer periphery of the outer race 22, and is non-rotatably attached to an axle case or the like (not shown) via the flange 26.

This embodiment is characterized by the shape of the swaged portion 3 of the shaft portion 12 of the hub wheel 1.

That is, the thickness of the region W from the radially intermediate position G of the caulking portion 3 to the outer peripheral edge is set to be gradually thinner toward the outer peripheral edge side, so that the outer portion of the region W of the caulking portion 3 is reduced. An end face is formed on the tapered surface 3a. The angle θ formed between the tapered surface 3a and the plane Z along the radial direction is set in the range of 30 to 45 degrees.

The taper starting point position G of the tapered surface 3a is appropriately specified, for example, radially outside the inner ring inner diameter.

Next, a method of forming the above-described caulked portion 3 will be described. First, the inner ring 21 is externally fitted to the small diameter portion 12a of the shaft portion 12 of the hub wheel 1, for example, by press-fitting, and then the free end of the shaft portion 12 is used as shown in FIG. Roll caulking using a caulking jig 90. At this time, the tip of the caulking jig 90 is applied to the shaft portion 12 and the caulking jig 90 is rolled around the dashed line O. As a result, the free end of the shaft portion 12 is swelled and deformed outward in the radial direction, and as shown in FIG.
A caulked portion 3 having the shape shown in FIG.

Thereafter, as shown in FIG. 2 (b), a punch jig 100 having a conical concave portion 101 on the front end surface is applied to the caulked portion 3 and pressed by a required pressure to thereby form the caulked portion 3. The tapered surface 3a is formed.

As described above, since the caulked portion 3 is not only obtained by rolling caulking but is compressed and deformed by pressing, it is necessary to press the caulked portion 3 against the outer end surface of the inner ring 21 more strongly than in the conventional example. And the return phenomenon of the caulked portion 3 can be hardly generated. As a result, the pull-out drag of the double-row outward-facing angular ball bearing 2 can be increased as compared with the related art.

Here, the reason why the angle θ of the tapered surface 3a of the caulked portion 3 is specified to be 30 to 45 degrees will be described. In other words, if the lower limit is set to less than 30 degrees, the pressing force by the press is weakened, and the caulking force is insufficient. On the other hand, when the upper limit of 45 degrees is exceeded, the pressing force by the press becomes too strong, and the caulking force becomes excessive. For example, indentations may be formed at the contact positions of the plurality of balls 23 on the inner ring 21. The thickness of the caulked portion 3 at the position of the tapered surface 3a is reduced, and the pull-out drag is reduced.

It should be noted that the present invention is not limited to only the above embodiment, and various applications and modifications are conceivable.

(1) In the above embodiment, rolling and swaging are used together to form the tapered surface 3a in the swaged portion 3. However, the tapered surface 3a can be formed only by rolling and swaging. In this case, as shown in FIG. 3, the rolling caulking jig 90 'has a stepped wall surface 91 at the tip thereof which is inclined, and the rolling caulking jig 90 is used to perform rolling caulking as shown in FIG. Good.

(2) In the above embodiment, the vehicle hub unit is taken as an example of the bearing device. However, the bearing device may be, for example, a guide roller for a sliding door of an automobile or the like, and other bearing devices in general.

[0024]

According to the present invention, the shape of the outer end surface of the swaged portion is devised so that the swaged portion is pressed against the outer end surface of the inner ring with an appropriate strength, and a return phenomenon occurs after swaging. Since it is possible to make it difficult to form, it is possible to increase the pull-out resistance by the caulked portion as compared with the related art.

In addition, since the upper limit of the inclination angle of the tapered surface formed in the caulking portion is appropriately defined, it is possible to prevent the impression of the rolling element from being formed on the raceway surface of the inner ring at the time of caulking. The operational stability of the rolling bearing can be secured.

[Brief description of the drawings]

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

FIG. 2 is a process diagram for explaining a caulking mode of a caulking portion in FIG. 1;

FIG. 3 is a side view showing a shape of a rolling caulking jig for obtaining a caulking portion in FIG. 1;

FIG. 4 is an explanatory view showing a caulking mode using the rolling caulking jig of FIG. 3;

FIG. 5 is a longitudinal side view of a conventional vehicle hub unit.

FIG. 6 is an explanatory view showing a rolling caulking mode.

[Explanation of symbols]

 Reference Signs List A Vehicle hub unit 1 Hub wheel 12 Hub wheel shaft portion 2 Double row outward angular contact ball bearing 21 Bearing inner ring 3 Caulked portion 3a Tapered surface of caulked portion G Radial intermediate position of caulked portion W Existence area of tapered surface

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomohiro Ishii 3-5-8 Minamisenba, Chuo-ku, Osaka-shi Koyo Seiko Co., Ltd. (72) Inventor Tadashi Mitarai 3-58-8 Minamisenba, Chuo-ku, Osaka-shi Inside Seiko Co., Ltd. (72) Inventor Keisuke Murakami 3-5-8 Minamisenba, Chuo-ku, Osaka-shi Koyo Seiko Corporation F-term (reference) 3J101 AA03 AA32 AA43 AA54 AA62 AA72 BA53 BA65 BA77 DA20 FA31 FA44 GA02

Claims (1)

[Claims] A rolling bearing is externally fitted to a shaft body, and the free end side of the shaft body is radially outwardly swelled by rolling caulking, and the swollen deformed caulked portion is formed on an inner ring of the rolling bearing. A bearing device in which a rolling bearing is retained and fixed to a shaft body by pressing against an outer end surface of the shaft, wherein a thickness dimension of a region from a radially intermediate position of the caulked portion to an outer peripheral edge is directed toward the outer peripheral edge side. By being set to be gradually thinner, the outer end surface of the region of the caulked portion is formed in a tapered surface, and an angle formed between the tapered surface and a plane along the radial direction is set in a range of 30 to 45 degrees. A bearing device characterized by the above-mentioned.