Abstract: The invention relates to a roller vane pump suitable for pumping transmission fluid in an automatic transmission for motor vehicles. The pump is provided with a pump housing (2), a rotatable carrier (3) being located in the interior of the pump housing (2), a cam ring (5) surrounding the carrier (3) in radial direction, and roller elements (7) being provided in slots (6) in the carrier periphery. The spaces between the pump housing (2), the carrier (3), the cam ring (5) and the roller elements (7) define a number of pump chambers (8). Furthermore, the pump is provided with feed apertures (9) for allowing a flow of fluid to a pump chamber (8) and with discharge apertures (10) for allowing a flow of fluid from a pump chamber (8). According to the invention constructional measurements are taken to avoid the occurrence of cavitation and to obtain higher pump efficiency.

Abstract: Continuously variable transmission having a hydraulically adjustable transmission ratio, includes a hydraulic circuit that interacts with a reservoir, at least two pumps for pumping hydraulic medium from the reservoir to an outflow channel and adjustor which act on the circuit, for switching the pumps in series or in parallel or is suitable for making and breaking hydraulic connections between an outlet opening of the first pump and an inlet opening of the second pump, between the outlet of the first pump and the outflow channel and between the inlet opening of the second pump and the reservoir and is at least provided with individual hydraulic elements for making and breaking a hydraulic connection between the outlet opening of the first pump and the inlet of the second pump and between the reservoir and the inlet opening of the second pump.