THRUST SLIDING BEARING

摘要

A thrust sliding bearing 1 includes a synthetic resin-made upper casing 100, a synthetic resin-made lower casing 200, and a synthetic resin-made thrust sliding bearing piece 300 interposed between the upper casing 100 and the lower casing 200, and the thrust sliding bearing piece 300 has an inner annular recessed groove 306 and an outer annular recessed groove 307 which are formed on an upper surface 304 along a circumferential direction and concentrically with each other on an inner side and an outer side in a radial direction X and a lubricating oil such as grease filled without any gap in each of the inner annular recessed groove 306 and the outer annular recessed groove 307.

主权项

1. A thrust sliding bearing comprising: a synthetic resin-made upper casing having an upper annular planar portion; a synthetic resin-made lower casing which is superposed on said upper casing so as to be rotatable about an axis of said upper casing and has a lower annular planar portion opposing the upper annular planar portion of said upper casing, a first and a second annular protrusion formed on the lower annular planar portion concentrically with each other, and a wide lower annular recess surrounded by the first and the second annular protrusion; and a synthetic resin-made thrust sliding bearing piece disposed in the lower annular recess of the lower casing and having an annular thrust sliding bearing surface which is brought into sliding contact with at least one of the upper annular planar portion and the lower annular planar portion, wherein said thrust sliding bearing piece has at least two annular recessed grooves which are formed on the thrust sliding bearing surface concentrically with each other and a lubricating oil filled in the annular recessed grooves.