Pre-cages for radial needle roller bearings

Abstract

To prevent the residual protrusion (22a) remaining on the circumferential end face of the retainer element (15b) from being in contact with the end face opposite to the residual protrusion (22a) due to the fracture of the small cross-sectional area portion (17a) during use. Abrasion occurs at the contact part. On one end surface of the retainer element (15b) in the circumferential direction, a protrusion (23) having a flat front end is provided in a state protruding in the circumferential direction. The arrangement, shape, and size of the small cross-sectional area portion (17a) and the convex portion (23) are restricted so that the retainer element (15b) is axially aligned with each other, and the front end portion of the convex portion (23) and the retainer In a state where the other circumferential end surface of the element (15b) is in contact, there is a circumferential gap (24) between the front end of the remaining protrusion (22a) and the circumferential end surface of the retainer element (15b).

Description

technical field [0001] The present invention relates to a preliminary cage for radial needle roller bearings used when assembling radial needle roller bearings incorporated in rotating machinery such as manual transmissions for automobiles, and constituting a combined cage after assembly. Background technique [0002] In manual transmissions for automobiles (including sequential MTs with basic automation of manual transmissions), such as Figure 9 As shown, the transmission gear 1 is rotatably supported around the power transmission shaft 2 via a radial needle bearing 3 (for example, refer to JP-A-2009-085401). The radial needle roller bearing 3 passes between the cylindrical outer raceway 4 provided on the inner peripheral surface of the transmission gear 1 and the cylindrical inner raceway 5 provided on the outer peripheral surface of the power transmission shaft 2, A plurality of needle rollers 6 are rotatably provided in a state held by a cylindrical cage 7 ( 7 a ), and ...

AI Technical Summary

Problems solved by technology

As a result, wear pieces and the like generated along with the wear enter the contact portion between the rolling surface of the needle roller 6 and the groove of the cage 7a, the outer raceway 4, and the inner raceway 5, which may cause the needle roller 6 to be damaged. Causes of early peeling of the raceway, outer ring rail 4, and inner ring rail 5, reduction in strength due to reduction in cross-sectional thickness of the column portion 10, etc.

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