| 摘要 |
PROBLEM TO BE SOLVED: To provide a thrust bearing made of resin with more surely reduced frictional resistance and improved manufacturability. SOLUTION: The resin thrust bearing 1 is mounted across a stepped surface of a shaft and a stepped surface of a shaft hole of a housing into which the shaft is inserted, so as to support the shaft. The resin thrust bearing 1 includes sliding surfaces that make sliding contact with the stepped surface of the shaft, concaved parts 12 for defining gaps between the step surface of the shaft and the thrust bearing, and inclined surfaces 13 arranged between the sliding surfaces and the concaved parts 12 so as to define wedge-shaped gaps between the stepped surface of the shaft and the thrust bearing. The inclined surfaces 13 are so inclined that the gaps between the step surface of the shaft and the thrust bearing become narrower toward the sliding surfaces in a direction of rotation of the shaft. A dynamic pressure acting in a direction in which the resin thrust bearing 1 separates from the stepped surface of the shaft is generated due to a flow of the lubricating oil in the wedge-shaped gaps caused by relative rotation of the shaft and the housing. Due to the generation of the dynamic pressure, when the resin thrust bearing 1 in which lubricating oil films are deposited across the stepped surface of the shaft and the sliding surfaces is loaded axially, the angle of inclination of the inclined surfaces 13 becomes appropriate for forming the lubricating oil films. COPYRIGHT: (C)2008,JPO&INPIT |
