Roller vane pump having a suction port through the cam ring

Details Roller vane pump having a suction port through the cam ring Roller vane pump having a suction port through the cam ring

1998-11-23

2000-11-28

Vrablik, John J.

Rotary expansible chamber devices

With plural working fluid inlet or outlet passages

418225, 418259, 417204, F04C 1344

Patent

active

061527114

ABSTRACT:
The invention relates to a roller vane pump for operating an automatic transmission for motor vehicles. The pump is provided with a pump housing (12), a rotor (4), a cam ring (2) and roller elements (7), which define a number of pump chambers (13). Fluid is communicated between a hydraulic channel (24) and a pump chamber (13) through suction ports (11 and 16) and discharge ports (17 and 18). According to the invention the pump is provided with a suction port (26) for allowing a predominantly radial flow of fluid to a pump chamber (13) and/or with a rotor (4) with slots (6) with a circumference (32) which is partly curved with a curvature substantially matching the curvature of the roller elements (7) and/or with a rotor (4) with a circumference segment (30) deviating at least partly from a circle, in order to decrease the amount of wear of pump parts as well as the noise level generated during pumping.

REFERENCES:
patent: T927009 (1974-10-01), Ulrich
patent: 3381622 (1968-05-01), Wilcox
patent: 3734654 (1973-05-01), Burenga et al.
patent: 4514157 (1985-04-01), Nakamura et al.
patent: 4578948 (1986-04-01), Hutson et al.
patent: 5466135 (1995-11-01), Draskovits et al.

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