Patent ID: 6299418
Filing Date: 2001-10-09
Classification: F04C

Abstract:
An oil pump apparatus comprising:a pump mechanism portion for discharging operating fluid;a valve receiving bore, formed in said housing, connected to a supply passage for leading the operating fluid discharged from said pump mechanism portion and connected to a bypass hole for draining excess operating fluid to a reservoir;a flow control valve, arranged in said valve receiving bore, having a bypass spool for regulating an opening area of said bypass hole in order to control a flow rate of the operating fluid by draining the excess operating fluid; anda bypass passage connected to said bypass hole, having a space radially extending from an edge of said bypass hole in a fluid stream direction of the excess operating fluid spouting from the opening area of said bypass hole, said radial extension being such that said bypass passage is non-circular as viewed in an axial direction of said bypass passage.