Retainer for radial needle bearing, method of manufacturing the same, and radial needle bearing

Abstract

A retainer for a radial needle bearing, a method of manufacturing the radial needle bearing, and the radial needle bearing. In the method, retainer elements (18) having elementary column parts (17) and (17) projected from rim parts (11) are manufactured by punching and bending a sheet metal. The rim parts (11) and (11) of the pair of retainer elements (18) and (18) are disposed concentrically to each other, and with the circumferential phases of the elementary column parts (17) and (17) aligned with each other, the tips of these elementary column parts (17) and (17) are abutted on and welded to each other to form column parts. Thus, the roundness of the rim parts (11) and (11) and the shape accuracy and the interval accuracy of the column parts can be improved without performing troublesome machining.

Description

technical field [0001] The present invention relates to an improvement of a cage for radial needle bearings and a manufacturing method of the cage, and realizes a cage capable of stably obtaining a cage of excellent quality and manufacturing such a cage. method of cage. Background technique [0002] Radial needle roller bearings are installed on the rotating support part of the automobile transmission or the rotating supporting part of various types of mechanical devices that apply large radial loads. For example, in a planetary gear type transmission constituting an automatic transmission for automobiles known through the specification of Patent Document 1 and the like, the planetary gears are rotatably supported by radial needle bearings with respect to the carrier. FIG. 33 shows an example of a rotation support for a planetary gear, which supports the planetary gear in a rotatable manner with respect to this type of carrier or the like. In the case of the structure show...

AI Technical Summary

Problems solved by technology

[0011] (1) The radius of curvature of the portion where the two ends of the intermediate material 14 in a cylindrical shape are butt-welded together is difficult to match with the radius of curvature of another intermediate material, so that the roundness of the pair of rims 11, 11 get worse

[0012] (2) And, with respect to the longitudinal axis (the vertical direction of Fig. 36), the middle part of the middle material 14, because the rigidity of the part connected to the cylindrical parts 12, 12 is different from the rigidity between the respective connecting parts, it is very Difficulty forming the two rim sections into correct circles

[0016] In conventionally known cages for radial needle roller bearings and methods of manufacturing the cages, there may be cases where the shape changes due to the above-mentioned reasons (1) to (5). Worse, as a result there is the possibility that the needle rollers 6, 6 are made to be difficult to fit in the respective cavities 13, 13, or on the contrary, the needle rollers 6, 6 installed in this way suddenly break away from their original position. Location

Of course, the aforementioned disadvantages can be prevented by performing a shape correction process on the cage 7 manufactured in the manner shown in FIG. 34 , but its cost increases, so this is not preferable.

In addition, since the retainer 7 is obtained having the above-mentioned substantially M-shaped cross section, it is troublesome to produce an intermediate material as shown in FIG. 36 from a strip material plate, which causes an increase in production cost.

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