Patent ID: 6149409
Filing Date: 2000-11-21
Classification: F01C,F04C

Abstract:
A vane pump comprising:a top section, a bottom section, and a middle section disposed between said top section and said bottom section;a vane rotor assembly positioned in a bore located in said middle section, said middle section bore having a top opening and a bottom opening;at least one bypass chamber formed in said middle section;at least one fluid feed chamber formed in said top section, said fluid feed chamber being partially aligned with said bore to allow fluid to flow into said top opening of said bore, and being partially aligned with said at least one bypass chamber to allow fluid to flow into said at least one bypass chamber;at least one fluid pocket formed in said bottom section for receiving fluid from said at least one bypass chamber, said fluid pocket being partially aligned with said at least one bypass chamber and being partially aligned with said bottom opening of said bore to allow fluid to flow into said bottom opening of said bore from said at least one bypass chamber;at least one fluid outlet chamber formed in said bottom section and being at least partially aligned with said bore to allow fluid to flow into said at least one fluid outlet chamber from said bore and out the bottom section;wherein said at least one fluid feed chamber is positioned to allow fluid to flow into said top opening of said bore and simultaneously into said at least one bypass chamber continuing though to said at least one fluid pocket and said bottom opening of said bore; andwherein fluid is supplied to said vane rotor assembly through both said top opening and said bottom opening of said bore whereby cavitation is reduced.