Roller vane pump having a partly curved vane slot
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Apr 23, 2002
Issued Date -
N/A
app pub date -
Oct 16, 2000
filing date -
Dec 8, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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