Patent ID: 6299564
Filing Date: 2001-10-09
Classification: F16H,Y10T

Abstract:
A system for control of a CVT driven by a drive unit comprising a bevel pulley (S1, S2) pair on each of the input and output shaft and a belt-type organ drivingly connecting the pulley pair, wherein the bevel pulley pair on the input shaft has an axially stationary bevel pulley and an axially movably primary pulley, and the bevel pulley pair on the output shaft has an axially stationary bevel pulley and a secondary pulley axially movably controlled, and a hydraulic control unit with electromagnetic actuators and hydraulic valves controlled by an electronic control unit, wherein with said primary pulley and said secondary pulley are respectively associated with a primary valve (6) and a secondary valve (5) which provide adjustment of the primary pulley and the secondary pulley respectively and therewith a change of ratio of the CVT, the main pressure valve (4) and the secondary valve (5) being connected with a common electromagnetically controlled pressure-control valve (10) and the main pressure valve (4) and the secondary valve (5) having a geometry and spring tension respectively so that the main pressure valve (4) and the secondary valve (5) have different characteristics.