JP2000087980A - Bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the shape of a caulked part by specifying the shape of an outside diameter 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 rolling-caulking a free end side of a shaft body 1 with the rolling bearing 2 fitted thereto, an outside diameter end face of a caulked part 3 is formed to be a flat surface approximately parallel to the axis of the shaft body 1. Since the outside diameter of the caulked part 3 can be controlled thereby, the interference of the caulked part 3 with an adjacent member at, for example, a place where the bearing device A is used, can be avoided.

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.

[0004] The shaft 81 of the hub wheel 80 is used.
Before caulking, as shown by a virtual line in FIG.
The cylindrical portion is provided with a cylindrical portion on the free end side of the shaft portion 81, and the cylindrical portion is fixed to the caulking jig 9 as shown in FIG.
Roll caulking using 0. 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 cylindrical portion of the shaft portion 81 is swelled and deformed outward in the radial direction.
Will be stopped.

[0005]

In the above conventional example, the outer end surface of the caulked portion 85 is formed into a rounded curved surface, and the outer diameter side end surface of the caulked portion 85 is aligned with the axis J of the hub wheel 80. It is formed on a slope that is inclined with respect to it.

Since the shape of the outer diameter side end face of the caulking portion 85 is not particularly controlled, the inclination angle of the outer diameter side end face of the caulking portion 85 may vary for each caulking operation. The outer diameter D of 85 tends to be irregular for each product.

If the outer diameter D of the caulked portion 85 is not controlled in this way, the caulked portion 85 is
May interfere with nearby members at the place of use. There is room for improvement here.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a bearing device that has a stable shape of a caulked portion.

[0009]

According to a first aspect of the present invention, there is provided a bearing device in which a rolling bearing is externally mounted on a shaft body, and the free end side of the shaft body is radially outwardly bulged and deformed by rolling caulking. Then, the swollen and deformed caulked portion is pressed against the outer end face of the inner ring of the rolling bearing to fix the rolling bearing to the shaft body, and the outer diameter side end face of the caulked portion is the shaft body. It is formed on a flat surface substantially parallel to the axis.

In the bearing device according to the second aspect of the present invention, a rolling bearing is externally fitted to the shaft body, and the free end side of the shaft body is radially outwardly deformed by rolling caulking to deform. By pressing the deformed caulking portion against the outer end surface of the inner ring of the rolling bearing, the rolling bearing is retained and fixed to the shaft body, and before the caulking of the shaft body, a cylindrical portion is provided on its free end side. By forming a tapered chamfer on the outer diameter side edge and the inner diameter side edge of the cylindrical portion, and controlling the chamfer angle, the outer diameter side end face of the caulked portion obtained by rolling caulking is It is formed on a flat surface substantially parallel to the body axis.

In such a configuration of the present invention, in short,
The outer diameter side end surface of the caulked portion is formed as a flat surface substantially parallel to the axis of the shaft body. This makes it easier to control the outer diameter dimension of the caulked portion, which is advantageous in preventing the caulked portion from interfering with nearby members at the place where the bearing device according to the present invention is used.

In particular, if the free end shape of the shaft body before caulking is devised as in the invention of claim 2, it is possible to obtain a caulked portion having the above-described shape only by performing rolling caulking, and an extra There is no need to increase the number of steps.

[0013]

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.

1 to 4 relate to an embodiment of the present invention. FIG. 1 is a longitudinal sectional side view of a vehicle hub unit, and FIG.
Is an enlarged view of a caulking portion, FIG. 3 is a side view showing a state before caulking of the shaft body, and FIG. 4 is a process diagram for explaining a caulking mode.

In the figure, A indicates the entire vehicle hub unit as a bearing device, 1 is a hub wheel as a shaft body, 2 is a double row outward angular ball bearing as a rolling bearing, and 3 is a swaged 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 outwardly-directed angular ball bearing 2 and for fixing the double-row outwardly-directed 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 outer diameter side end face of the caulked portion 3 of the shaft portion 12 of the hub wheel 1.

That is, the outer diameter side end surface of the caulked portion 3 is formed as a flat surface substantially parallel to the axis J of the hub wheel 1 as shown in FIG. Such a caulking part 3
As shown in FIG. 3, the cylindrical portion 12 is attached to the free end side of the shaft portion 12 of the hub wheel 1 before swaging as shown in FIG.
The tapered chamfers 12d and 12e are formed on the outer edge and the inner edge of the cylindrical portion 12c.

In the above chamfers 12d and 12e, the axial width W and the chamfer angles θ1 and θ2 are appropriately set according to the thickness of the cylindrical portion 12c of the shaft portion 12.

After the inner ring 21 is externally fitted to the small-diameter outer peripheral surface 12a of the shaft portion 12 of the hub wheel 1 by press-fitting, the cylindrical portion 12c of the shaft portion 12 is used for explanation in the prior art. The rolling caulking is performed using a caulking jig 90 as shown in FIG. At this time, caulking jig 90
Is applied to the cylindrical portion 12c of the shaft portion 12, and the caulking jig 90 is rolled around the dashed line O. As a result, the cylindrical portion 12c of the shaft portion 12 is bulged and deformed radially outward, and the swaged caulked portion 3 prevents the inner ring 21 from coming off.

Cylindrical part 1 by rolling caulking
In the process of bulging deformation of 2c, first, as shown in FIG. 4 (a), the end face of the cylindrical portion 12c and the outer diameter chamfer 12d become flush, and subsequently, as shown in FIG. 4 (b). Then, the flat surface and the inner diameter chamfer 12e, which have been flushed first, are pressed against the outer end face of the inner race 21 while being flush with each other. Here, when the axial dimension of the cylindrical portion 12c before caulking is the same between the present embodiment and the conventional example,
As shown by the solid line and the one-dot chain line in FIG. 4B, the radial position of the outer diameter side end face of the caulked part 3 of the present embodiment corresponds to the outer diameter side end face of the conventional caulked part shown by the one-dot chain line. It will be located radially outward from the radial position. In this case, the swaging length for pressing the inner ring 21 is substantially longer than the conventional example by ΔL, which is advantageous for the bending moment.

As described above, if the outer diameter side end face of the caulked portion 3 is made flat, the outer diameter D of the caulked portion 3 can be controlled with high accuracy, and the caulked portion 3 can be controlled. The external shape can be stabilized. Thus, it is possible to prevent the caulking portion 3 from interfering with a nearby member at the place where the hub unit A is used, and to stably secure the pull-out force, thereby contributing to the improvement of reliability. Become.

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, a hub unit for a vehicle, particularly a driven wheel, has been described as an example of a bearing device.
It can be a hub unit for driving wheels as shown in FIG. 5, or a guide roller for a sliding door of an automobile or the like and other bearing devices in general. In FIG. 5, the drive shaft 4 is spline-fitted to the hollow portion of the shaft body 1 and connected with the nut 5.

[0026]

According to the first and second aspects of the present invention, the shape of the outer diameter side end face of the caulked portion is specified so that the outer diameter of the caulked portion can be controlled. In the place where the bearing device is used, it is possible to prevent the caulked portion from interfering with a nearby member.

In particular, if the free end side shape of the shaft body before caulking is devised as in the second aspect of the present invention, the caulked portion having the above-described shape can be obtained only by performing rolling caulking. There is no need to increase the number of steps, which is advantageous in suppressing the manufacturing cost.

[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 an enlarged view of a caulked portion in FIG. 1;

FIG. 3 is an enlarged view of a main part showing a state before caulking of the shaft body of FIG. 1;

FIG. 4 is a process diagram for explaining a caulking mode of a caulking portion in FIG. 1;

FIG. 5 is a longitudinal side view of a vehicle hub unit according to another embodiment of the present invention.

FIG. 6 is a longitudinal sectional side view of a conventional vehicle hub unit.

FIG. 7 is an enlarged view of a swaged portion in FIG. 5;

FIG. 8 is an explanatory view showing a rolling caulking mode.

[Explanation of symbols]

 A Hub Unit for Vehicle 1 Hub Wheel 12 Hub Wheel Shaft 2 Double Row Outward Angular Contact Ball Bearing 21 Bearing Inner Ring 3 Caulked Part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomohiro Ishii 3-5-8 Minamisenba, Chuo-ku, Osaka-shi Inside Koyo Seiko Co., Ltd. (72) Inventor Tadashi Mitarai 3-5-8 Minamisenba, Chuo-ku, Osaka-shi Inside Seiko Co., Ltd. (72) Inventor Keisuke Murakami 3-5-8 Minamisenba, Chuo-ku, Osaka-shi Koyo Seiko Co., Ltd. F-term (reference) 3J101 AA03 AA32 AA43 AA54 AA62 AA72 BA53 BA64 BA77 DA20 FA31 FA44 GA02

Claims (2)

[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 the rolling bearing is retained and fixed to the shaft body by pressing against the outer end surface of the shaft member, wherein the outer diameter side end surface of the caulked portion is formed as a flat surface substantially parallel to the axis of the shaft body. And a bearing device characterized by that. 2. A rolling bearing is externally fitted to a shaft body, and the free end side of the shaft body is radially outwardly swelled and deformed by rolling caulking, and the swollen and deformed caulked portion is formed on an inner race of the rolling bearing. A bearing device in which the rolling bearing is retained and fixed to the shaft body by pressing against the outer end surface of the shaft body, and before the shaft body is caulked, a cylindrical portion is provided on its free end side, and the cylindrical portion is By forming a tapered chamfer between the outer diameter side edge and the inner diameter side edge, and controlling this chamfer angle, the outer diameter side end face of the caulked portion obtained by rolling caulking is substantially parallel to the axis of the shaft body. A bearing device formed on a simple flat surface.