Thrust roller bearing

Abstract

A cage of a thrust roller bearing includes: a pair of crank-shaped bent portions arranged in a circumferential direction of the cage; a pair of inner wall surfaces arranged in a radial direction of the cage; and a pocket for housing a roller defined by the pair of bent portions and the pair of inner wall surfaces and formed by punching the cage. Radially inner one of the inner wall surfaces is formed as a guiding surface for guiding a substantial roller PCD position of an end surface of the roller. Each of the pair of bent portions includes a first extended portion extending in one of cage thickness directions and a second extended portion extending in the other cage thickness direction. A roller retaining pawl for retaining the roller is provided at each of the first and second extended portions so as to protrude into the pockets.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a top plan view showing a thrust roller bearing according to Mode of Embodiment 1 of the invention.

FIG. 2 is a perspective view showing the pocket periphery of the same thrust roller bearing in an enlarged scale.

FIG. 3 is a top plan view showing the pocket periphery of the same thrust roller bearing in an enlarged scale.

FIG. 4 is a sectional view along line IV-IV of FIG. 3.

FIGS. 5A to 5C are sectional views showing the various mounted states of the rollers in the cage of the same thrust roller bearing.

FIG. 6 is a top plan view showing a portion of the pocket periphery of a thrust roller bearing of Mode of Embodiment 2 of the invention in an enlarged scale.

Claims

1. A thrust roller bearing comprising: a cage that is made of an annular plate, the cage including: a pair of crank-shaped bent portions formed at a radially intermediate area of the cage, the pair of bent portions being arranged in a circumferential direction of the cage;a pair of inner wall surfaces arranged in a radial direction of the cage; anda pocket for housing a roller, the pocket being defined by the pair of bent portions and the pair of inner wall surfaces and formed by punching the cage,wherein radially inner one of the inner wall surfaces is formed as a guiding surface for guiding a substantial roller PCD position of an end surface of the roller,wherein each of the pair of bent portions includes a first extended portion extending in one of cage thickness directions and a second extended portion extending in the other cage thickness direction, andwherein a roller retaining pawl for retaining an outer circumference of the roller is provided at a top side surface of each of the first and second extended portions so as to protrude into the pockets.

2. The thrust roller bearing according to claim 1, wherein axially opposite ends of the roller are chamfered,corners of the pocket are rounded, anda protrusion that abuts against and pivotally supports a center portion of the end surface of the roller is provided at the guide surface.