Thrust sliding bearing and combination mechanism of the thrust sliding bearing and a piston rod

摘要

A thrust sliding bearing includes a synthetic resin-made bearing body having a hollow cylindrical portion, an annular collar portion, an annular protruding portion, a tubular projecting portion, an engaging projecting portion, and an annular projecting portion; an annular cover having a disk portion, a tubular portion, and an engaging projecting portion; an annular metal plate having an outer disk portion and an inner disk portion; and a thrust sliding bearing which is interposed between the bearing body and an annular lower surface of the outer disk portion of the annular metal plate and renders the annular metal plate rotatable with respect to the bearing body in a direction about an axis of the bearing body.

主权项

1. A thrust sliding bearing comprising:
a synthetic resin-made bearing body having a hollow cylindrical portion with a cylindrical inner peripheral surface defining a through hole, an annular collar portion integrally extending radially outwardly from a cylindrical outer peripheral surface of the hollow cylindrical portion, an annular protruding portion integrally protruding radially outwardly from a lower side of a cylindrical outer peripheral surface of the annular collar portion, a tubular projecting portion formed on an annular upper surface of the annular protruding portion, said tubular projecting portion having a cylindrical inner peripheral surface, an annular outer recessed portion being defined by the cylindrical inner peripheral surface of said tubular projecting portion, the cylindrical outer peripheral surface of the annular collar portion and the annular upper surface of the annular protruding portion, and an annular engaging projecting portion projecting radially outwardly from a cylindrical outer peripheral surface of the tubular projecting portion; an annular cover having a disk portion with an inner peripheral surface defining a through hole concentric with the through hole of said bearing body as well as an annular upper surface and an annular lower surface, a tubular portion formed integrally with the disk portion and having an inner peripheral surface, and an engaging projecting portion projecting radially inwardly from the inner peripheral surface of the tubular portion and adapted to engage the engaging projecting portion of said bearing body; an annular metal plate having a radially outwardly disposed outer disk portion having an annular upper surface coming into contact with the annular lower surface of the disk portion of said annular cover and a radially inwardly disposed inner disk portion formed integrally with the outer disk portion and disposed in the through hole defined by the inner peripheral surface of the disk portion of said annular cover; and a thrust sliding bearing mechanism between said bearing body and an annular lower surface of the outer disk portion of said annular metal plate and renders said annular metal plate rotatable with respect to said bearing body in a direction about an axis of said bearing body, wherein the inner disk portion has a cylindrical inner peripheral surface having a smaller diameter than a diameter of the inner peripheral surface of the hollow cylindrical portion of said bearing body and defining a through hole concentric with the both through holes, and said thrust sliding bearing mechanism has an annular upper surface of said bearing body, a first annular groove formed on an inner peripheral side of the annular upper surface, a second annular groove surrounding the first annular groove and being shallower in depth than the first annular groove, and a lubricant which is filled in the first annular groove and the second annular groove.