Outer ring for shell type radial needle roller bearing and manufacturing method thereof
The invention relates to a needle roller bearing and a manufacturing method, which are applied to the outer ring for a shell-type radial needle roller bearing and its manufacturing field, and can solve the problems of increased manufacturing cost, increased resistance, decreased productivity, etc., and can improve fatigue strength and prevent position The effect of dislocation and improvement of surface properties
Inactive Publication Date: 2014-10-15
NSK LTD
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- Abstract
- Description
- Claims
- Application Information
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.
Method used
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Effect test
Embodiment
[0069] Experiments performed to confirm the effects of the present invention will be described. In the experiment, as image 3As shown, the cylindrical portion 8a of the outer ring 6a serving as the test piece is fitted and fixed in the holding hole 37 of the fixture 36 with an interference fit. The holding hole 37 is a through hole, and the bottom plate portion 9a of the outer ring 6a is not supported. In this state, the plurality of needle rollers 7 are inserted into the outer ring 6a together with the shaft portion 4 of the cross shaft 2, and the front end surface of the shaft portion 4 is brought into contact with the inner surface of the bottom plate portion 9a. In addition, it was measured that a fluctuating load, which was varied within the range of 500 to 1500 N by the push rod 38, pressed the front end surface of the shaft portion 4 to the inner surface of the bottom plate portion 9a until it was generated on the outer ring 6a as a test piece. The number of times of...
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Abstract
The present invention relates to a bottomed cylindrical shell-type radial needle roller bearing outer ring (6a), which improves the bottom plate portion (9a) and the bottom plate portion (9a) and cylindrical portion (8a) without increasing the cost. Improve the fatigue strength of the continuous part, and also improve the antirust performance and detachment resistance of the outer ring (6a). Because it is a metal material, after obtaining the intermediate raw material (35) having a cylindrical portion and a bottom plate portion, the intermediate raw material (35) is subjected to shot peening treatment, and the cylindrical portion (8a) and the bottom plate portion (9a) are The residual compressive stress generated on the outer surface and surface layer is greater than that of the inner surface layer, and the residual compressive stress of the outer surface layer is set to 700-1600 MPa at a depth of 0.03 mm from the surface.
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 Figure 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 p...
Claims
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IPC IPC(8): F16C33/58F16C19/46F16C33/64F16D3/41
CPCF16C19/466F16C2220/40Y10T29/49689F16C33/64F16C2240/18F16D3/41B21D53/12B24C1/10F16D3/385F16C33/588F16C2220/42B21D53/10F16C21/005F16C2361/41
Inventor 樋口政人竹尾则之小村芳明
Owner NSK LTD