Continuously variable transmission with at least two pumps conne

Details Continuously variable transmission with at least two pumps conne Continuously variable transmission with at least two pumps conne

1997-08-20

1999-08-24

Graysay, Tamara L.

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

Load responsive

474 28, 60430, F16H 5900, F16H 6100, F16D 3102

Patent

active

059417862

ABSTRACT:
Continuously variable transmission, in particular for a motor vehicle, provided with a primary pulley mounted on a primary shaft, a secondary pulley mounted on a secondary shaft, and a drive belt running over both pulleys, each pulley formed by two sheaves, one of which is movable axially relative to the other under the influence of a hydraulic cylinder, for setting the transmission ratio, a pumping unit with at least two pumps for delivering hydraulic medium to the hydraulic cylinders, and a control unit for controlling the pump delivery depending on the operating conditions of the transmission, includes a pumping unit with at least two pumps, the first of which serves as a booster pump for the second pump connected in series, and a switch valve, under the control of the control unit, fitted so that the two pumps can be switched over from series connection to parallel connection if the volume flow of the medium required by the transmission is greater than the available volume flow in the series connection.

REFERENCES:
patent: 5431545 (1995-07-01), Knight et al.

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