Retainer made of synthetic resin for use in a deep groove ball bearing; deep groove ball bearing; and gear support device

Abstract

A retainer made of a synthetic resin for use in a deep groove ball bearing is proposed of which the lubricity has been improved. The retainer includes a cylindrical first split retainer member () having a first axial side, and a cylindrical second split retainer member () having a second axial side coupled to the first axial side of the first split retainer member (). Circumferentially spaced apart first and second cutouts (and) are formed in the first axial side of the first split retainer member () and the second axial side of the second split retainer member (), respectively, which define respective pockets for receiving balls with the split retainers (and) coupled together. A coupling arrangement (X) is provided between the first and second split retainer members (and) which is adapted to engage the split retainer members (and) when the split retainer members (and) are coupled together, thereby keeping the split retainer members (and) axially inseparable from each other. With the retainer mounted in a deep groove ball bearing, when the outer race () and the inner race () rotate relative to each other, since the first and second split retainer members (and) rotate at different peripheral speeds due to a difference in diameter therebetween, pumping action is produced in the bearing, which causes a forced flow of lubricating oil in the bearing.