Bearing device for drive wheel

Abstract

The invention relates to a bearing device for driving wheel. An end of a hub wheel 30 is plastically deformed towards outside diameter, a riveting portion 37 along radius direction is formed, and the hub wheel 30 and an inner wheel 40 arranged on periphery of the hub wheel are integrated. An outside shaft coupling component 72 of a constant velocity universal coupling 70 is pressed in bore of thehub wheel 30, and serrations 81 on bore of the hub wheel 30 is matched with a serration shaft 82 of the outside shaft coupling component 72. The length of the serrations 81 on bore of the hub wheel 30 along axial direction is in a standard range, and radius reducing of the serrations 81 associated with riveting is reduced.

Description

[0001] This application is a divisional application dated March 25, 2002, application number 02800886.3, and the title of the invention is "Bearing device for driving wheels" (divisional application submission date is February 12, 2007, application number is 200710080108.6) Apply. technical field [0002] The present invention relates to the freely rotatable support of the driving wheels (rear wheels of FR (front-engine rear-wheel drive) cars) of automobiles, etc. relative to the vehicle body, front wheels of FF cars (front-engine front-wheel drive), 4WD (four-wheel drive) ) Bearing device for all wheels of the car. Background technique [0003] Various types of bearing devices for drive wheels of automobiles have been proposed according to their applications. For example, the bearing device for driving a wheel shown in FIG. 12 has a structure in which the hub wheel 3 and the multi-row bearing portion are unitized into one bearing, and the outer joint member of the constant...

AI Technical Summary

Problems solved by technology

[0009] However, in this countermeasure, since the amount of diameter reduction accompanying riveting varies greatly due to different riveting conditions, at least the large diameter portion φd2 must be strictly controlled, which increases the manufacturing cost.

[0010] As another countermeasure, such as Figure 17 As shown, in the periphery of the hub wheel 3, a large part of the part X' that is expected to reduce the diameter after riveting is cut off, and this part is made into a cylindrical surface without broaching, but in this case Next, the effective length of the serrated teeth 8a in the axial direction is shortened, and there is a problem that the torque cannot be sufficiently transmitted between the constant velocity universal joints 7.

[0011] In addition, in the prior art, in the caulking portion 3a of the hub wheel 3, there is known a method of flattening the surface abutting the outer coupling 7a by finishing and turning (Japanese Unexamined Patent Publication No. 11-5404 ), but even if you want to make the riveted part 3a a flat surface, because the flatness of the end surface is limited, plus bending, etc., sometimes a small Clearance

During turning and driving, a large moment load is generated on the bearing, and when this moment load is applied, the bearing undergoes elastic deformation, and at the same time, the self-sustaining structure that the tightening force of the nut 9 may be weakened further widens the butt joint There is a gap between the surfaces, and dust and rainwater enter the gap through the gap.

When dust and rainwater intrude into the mating portion of the hub wheel 3 and the serrated shaft 8b, it will rust, which will not only accelerate the wear of the mating portion, but also increase the man-hours for fixing and disassembling the mating portion, which is not ideal.

[0012] In addition, the serration shaft 8b of the outer joint member 7a is detachably connected to the hub wheel 3 by using a stop ring, and the radial gap between the hub wheel 3 and the serration shaft 8b is sealed by a sealing member. structure (Japanese Patent Application No. 2000-142009), but due to the gap between the above-mentioned butt joints, compared with the nut fastening structure shown in Figure 14, it is much larger, so it is necessary to install a firm sealing member, while increasing the cost, Doesn't prevent a decrease in rigidity of the entire device, so is not ideal

Images