Patent ID: 6152711
Filing Date: 2000-11-28
Classification: F04C

Abstract:
Roller vane for pumping automatic transmission fluid in a belt-and-pulley type continuously variable transmission for motor vehicles, comprising:a pump housing (12);a drivingly rotatable rotor (4) driven by a main drive shaft of the motor vehicle;a cam ring (2) located around said rotor (4) at a fixed orientation therewith;roller elements (7) accommodated in slots (6) on a periphery of the rotor (4),wherein the cam ring (2), the rotor (4), the roller elements (7) and the pump housing (12) define a number of pump chambers (13), which chambers (13) are in communication with one or more hydraulic channels (24) in the pump housing (12) through at least two radially spaced first suction ports (11 and 16) extending axially through a portion of the housing for allowing a predominantly axial flow of fluid to pump chambers (13) and through at least two radially spaced discharge ports (17, 18) for allowing a predominantly axial flow of fluid from the pump chambers (13),wherein the cam ring (2) is provided with a recess (25) constituting a second suction port (26) for allowing a predominantly radial flow of fluid to the pump chambers (13), whereby the radially outer one (11) of said first suction ports (11, 16) for allowing a predominantly axial flow of fluid to the pump chambers (13) and the second suction port (26) for allowing a predominantly radial flow of fluid to the pump chambers (13) adjoin one another.