JP2000016007A - Bearing device for car axle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device for car axle which can decrease the number of component parts and can reduce the fabrication and processing costs. SOLUTION: An outer ring 1 of an constant velocity joint is fabricated through press working and coupled with a hub 2 by threaeds. The end of the outer ring 1 is welded to the hub 2, or otherwise, the end of outer ring, may be caulked fast to the hub 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axle bearing device disposed between a drive shaft (axle) drive wheel of an automobile or the like and a wheel, and more particularly to an axle cormorant capable of reducing the number of parts around the bearing. It relates to a bearing device.

[0002]

2. Description of the Related Art A rotational torque transmitted from a propeller shaft of an automobile or the like via a differential gear is further transmitted from a drive shaft (axle) to wheels.
An axle bearing device (wheel bearing device) as shown in FIG. 3 is provided between the drive shaft and the wheels. Such a conventional axle bearing device includes a constant velocity joint outer ring 11 at a drive shaft end, a hub 12 attached to wheels to form an inner ring raceway surface, an outer ring 13 fixed to a vehicle body side, and the hub 12. Inner ring member 14 press fit into
And rolling elements (balls) 15, 15 disposed between the outer ring 13 and the hub 12 and the inner ring member 14.

[0003]

In the axle bearing device having the above structure, the constant velocity joint outer ring 11 and the hub 12 rotate integrally.
As shown in FIG. 3, the outer periphery of the cylindrical portion 11a of the outer race 11 and the cylindrical portion 12 of the hub 12 are connected to each other.
b is spline-fitted. Further, a female screw 11b is threaded on the inner diameter of the cylindrical portion 11a of the outer race 11 of the constant velocity joint, and a stepped portion 12c is provided at an end of the hub 12, and a washer 16 is placed. It is configured to be integrally connected by bolts 17. In the axle bearing device having the above-described configuration, the constant velocity joint outer ring 11 and the hub 12 must be splined or threaded, and the number of parts is large, and the number of assembling steps is also large, which is a factor of cost increase.

An object of the present invention is to provide a bearing device for an axle that can reduce the number of parts and the production and processing costs.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a constant velocity joint outer ring (1), a hub (2) mounted on a wheel and forming a bearing, and fixed to a vehicle body side. And a double row rolling element (5, 5) disposed between the hub (2) and the outer ring (3). The constant velocity joint outer ring (1) is manufactured by press working, and the constant velocity joint outer ring (1) and the hub (2) are manufactured.
Are screwed together, and the end of the constant velocity joint outer ring (1) and the hub (2) are welded.

Alternatively, instead of welding, the hub (2)
The end of the constant velocity joint outer ring (1) screw-connected to the hub (2) is swaged to the hub (2).

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an axial sectional view of an axle bearing device of the present invention. This axle bearing device includes a constant velocity joint outer ring 1, a hub 2 attached to wheels to form an inner ring raceway surface 2a, and an outer race 3 fixed to a vehicle body (not shown) and forming raceway surfaces 3a and 3b.
An inner race member 4 fitted and fixed to the hub 2 and provided with a raceway surface 4a; a rolling element (ball) 5 arranged between the constant velocity joint outer race 1 and the hub 2 and the inner race member 4; It consists of. Reference numerals 6 and 7 denote sealing members. The inner ring member 4 is fitted to the hub 2.
Alternatively, a raceway surface may be formed on a part of the outer peripheral surface of the outer race 1 of the constant velocity joint.

Next, the constant velocity joint outer ring 1 is manufactured by press working. A cylindrical portion 1a is formed at the end of the constant velocity joint outer ring 1, and a male screw 1b is engraved on the cylindrical portion 1a. A female screw 2c is engraved on the inner peripheral surface of the cylindrical portion 2b of the hub 2. When assembling the axle, the constant velocity joint outer ring 1 and the hub 2 are screwed together. By this screw connection, an axial force (preload) can be applied to the hub 2 and the bearing portion composed of the inner ring member 4, the outer ring 3, and the balls 5, 5.

FIGS. 2A and 2B are partially enlarged views of FIG. After the constant velocity joint outer ring 1 and the hub 2 are screw-coupled to each other, in order to secure these connections, as shown in FIG.
Outer peripheral end of male screw 1b of cylindrical portion 1a and female screw 2 of hub 2
The edge of c is spot-welded (preferably spot-welded). Alternatively, as shown in FIG. 2B, a groove 2d may be provided on the inner peripheral surface of the cylindrical portion 2b of the hub 2, and the end of the cylindrical portion 1a of the outer race 1 of the constant velocity joint may be crimped by pressing.

When the constant velocity joint outer ring 1 and the hub 2 are integrally connected to each other as in a conventional axle bearing device, a spline connection and a bolt integrated together increase the number of parts and the number of processing steps, or When the speed joint outer ring 1 and the hub 2 are integrally formed, the inertia moment increases because the diameter of the bearing portion becomes large, and when press-fitting and welding are performed, a choice between a weldable material and bearing steel is required. There are problems such as difficulty. However, with the configuration as in the present invention, it is possible to solve such a problem that the conventional axle bearing device has.

[0011]

As described in detail above, according to the axle bearing device of the present invention, spline fitting and bolt fixing are not required, and the number of parts and the number of processing steps can be reduced, and the manufacturing cost can be reduced. . Further, since the outer race of the constant velocity joint and the hub are provided separately, the diameter of the bearing portion of the axle bearing device can be reduced to reduce the influence of inertia moment.

[Brief description of the drawings]

FIG. 1 is an axial sectional view of an axle bearing device of the present invention.

FIGS. 2A and 2B are partially enlarged views of FIG. 1;

FIG. 3 is an axial sectional view of a kind of a conventional axle bearing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Constant-velocity joint outer ring 1b Male screw 2 Hub 2b Cylindrical part 2c Female screw 2d Groove 3 Outer ring 4 Inner ring member 5 Rolling element (ball)

Claims (2)

[Claims] 1. A constant velocity joint outer ring, a hub attached to a wheel to form a bearing portion, an outer ring fixed to a vehicle body side to form a bearing portion, and a double row of a plurality of rows arranged between the hub and the outer ring. An axle bearing device provided with a rolling element, wherein the constant velocity joint outer ring is manufactured by press working, the constant velocity joint outer ring and the hub are screw-connected, and an end of the constant velocity joint outer ring and a hub. And a bearing for an axle, wherein the bearing is welded. 2. The axle bearing device according to claim 1, wherein an end of a constant velocity joint outer ring screwed to the hub is caulked to the hub.