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A vane pump driven by an engine to serve generally as a source of hydraulic fluid pressure for operating a power steering apparatus. A high pressure chamber (13) is formed either in a pump housing (4) or in a cover plate (6) by casting using a core. An end of the pump housing (4) or of the cover pla

A vane pump driven by an engine to serve generally as a source of hydraulic fluid pressure for operating a power steering apparatus. A high pressure chamber (13) is formed either in a pump housing (4) or in a cover plate (6) by casting using a core. An end of the pump housing (4) or of the cover plate (6) defines a slide surface (11) with which a rotor (2) and vanes (1) are slidably and directly engaged, thus being formed with delivery ports (12) or suction ports (29). This precludes the need of a side plate, a spring for biasing the side plate against the rotor, and others which have hitherto been indispensable for a vane pump, so that the total number of components parts is reduced. A cam ring (5) is sandwiched between the pump housing (4) and cover plate (6) and locked together to the pump housing (4). This makes it needless to form a bore in the pump housing (4) for accommodating a cam ring and thereby enhances the machinability of such a pump.

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A vane pump comprising a rotor (2) which has a plurality of vanes (1) arranged radially thereon and driven for rotation by a pump shaft (3), a cam ring (5) having a cam surface (9), said cam ring (5) accommodating said rotor (2) thereinside to permit said vanes (1) to remain in slidable engagement w

A vane pump comprising a rotor (2) which has a plurality of vanes (1) arranged radially thereon and driven for rotation by a pump shaft (3), a cam ring (5) having a cam surface (9), said cam ring (5) accommodating said rotor (2) thereinside to permit said vanes (1) to remain in slidable engagement with said cam surface (9), a pump housing (4) having an inlet and an outlet, said pump housing (4) rotatably supporting a pump shaft (3) and having a slide surface (11) which is engaged with one end face of said cam ring (5) and the corresponding end face of said rotor (2), a cover plate (6) having a slide surface (11) which is engaged with the other end face of said cam ring (5) and the corresponding end face of said rotor (2), fastening means for locking said pump housing (4), cover plate (6) and cam ring (5) together with said cam ring (5) held between said pump housing (4) and said cover plate (6), said pump housing (4) being formed with a valve chamber (14) adapted to receive a flow control valve to control outlet flow, said pump housing (4) having a pressure chamber (13) which communicates with said valve chamber (14), said slide surface (11) of said cover plate (6) being formed with a pair of inlet ports (29), said cover plate (6) having a bifurcated passageway (16C) terminating at said inlet ports (29), said pump housing (4) having an excess return passageway (16A) at an excess fluie return side of said pump housing (4), said cam ring (5) being formed with a cam ring passageway (16B) providing fluid communication between said bifurcated passageway (16C) and said excess return passageway (16A), said pump housing (4) having a suction port (17) which communicates with said excess return passageway (16A), said suction port (17) being adapted to be connected to a reservoir, said suction port (17) being disposed adjacent to said valve chamber (14), said cam ring (5) having engagement surfaces (22, 24) engaging said slide surfaces (11) of said pump housing (4) and said cover plate (6), and a seal ring (31) on each of said engagement surfaces (22,24), said seal rings (31) extending around said cam surface (9) and partially around the outer periphery of said cam ring passageway (16B), whereby said cam ring passageway (16B) and said cam surface (9) are enclosed with said seal rings (31).