Shell-type radial needle bearing outer ring and method for manufacturing same

Abstract

In a shell-type radial needle bearing outer ring (6a) having a cylindrical shape with a bottom, without incurring a cost increase, the bottom plate portion (9a) thereof and the continuous portion between the bottom plate portion (9a) and the cylindrical portion (8a) are improved in fatigue strength, and the anti-rust performance of the outer ring (6a) and the performance for retaining the outer ring (6a) are also improved. After an intermediate material (35) having a cylindrical portion and a bottom plate portion is obtained from a metal material, shot peening is performed on the intermediate material (35) to produce a residual compressive stress in the outer surface side surfaces and surface layer portions of the cylindrical portion (8a) and the bottom plate portion (9a). The residual compressive stress in the outer surface side surface layer portions is made larger than that in the inner surface side surface layer portions and is set to 700 to 1600 MPa in the region from the surfaces to a depth of 0.03 mm.

Description

technical field [0001] The present invention relates to an outer ring constituting a shell-type radial needle roller bearing incorporated into a rotation support portion of a cross-type universal joint called a universal joint, and an improvement in a manufacturing method thereof. Background technique [0002] In order to connect the ends of a pair of rotating shafts that do not exist on the same straight line that constitute the steering device and the transmission shaft of a motor vehicle so that the rotating force (torque) can be transmitted to each other, conventionally, a so-called universal joint shaft is used. Sectional cross shaft universal joint. The cross shaft universal joint such as Image 6 The illustrated figure includes a cross shaft 2 and a pair of yokes 1a and 1b that are fixed to both ends of the above-mentioned rotating shaft and have two branches at their respective front ends. A pair of circular holes 3 concentric with each other are provided at each pa...

AI Technical Summary

Problems solved by technology

However, if using the Figure 9 Such a structure as shown has the following problems: the shape of the bottom plate portion 9a becomes complicated, the design of the mold used for manufacturing becomes difficult, and the adjustment of the mold becomes troublesome, the productivity decreases, and the manufacturing cost increases.

It is very difficult to find their existence, and if they are kept as they are, there will be problems such as increased resistance when the bearing is press-fitted, and oxide components will be mixed into the inside of the bearing during use.

However, there is a problem that it takes a lot of labor and time to perform individual screening operations for such minute oxides that are difficult to find, and it also costs money.

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