SURFACE CONSTRUCTION OF SOFT METALLIC BODY HAVING HOLE FORCEDLY FITTING RIGID UNIT

摘要

PURPOSE:To prevent a decrease of connectability in a connection surface with the other member, by providing a thickness removal part for relieving a swell in a soft metallic main body into which a rigid unit is forced to be fitted by pressure. CONSTITUTION:A soft metallic main body 3, having a hole 2 forcing a rigid unit 1 to be fitted by pressure, provides a thickness removal part 4 for relieving a swell on a surface of the main body in the vicinity of the hole 2 swollen by the ring unit 1 being forced to be fitted by pressure. This thickness removal part, holding connectability of the rigid unit 1 with the main body 3, effectively prevents a leak of oil or the like from a connection surface due to tightening.