SLIDING MEMBER FOR HYDRAULIC CONTROL VALVE, AND SLIDE! MEMBER FOR HYDRAULIC CONTROL VALVE

摘要

PROBLEM TO BE SOLVED: To improve the wear resistance of a sliding surface of an aluminum alloy sleeve or the like used for a hydraulic control valve. SOLUTION: The aluminum alloy sleeve 30 disposed in a valve body 10 and supporting a spool 20 slidably to the inner periphery is formed with an aluminum oxide coat on the surface, and has a two-stage chamfer between a sliding surface 31 of the sleeve 30 and an end face 35 orthogonal to the sliding surface 31. In this case, a first clearance angleα1 defined by the sliding surface 31 and a first chamfer 32 abutting on the sliding surface 31 is formed to be smaller than a second clearance angleα2 defined by the sliding surface and a second chamfer 33 abutting on the face orthogonal to the sliding surface 31, to constitute the hydraulic control valve.