HYDRAULIC PRESSURE-REGULATING DEVICE, IN PARTICULAR FOR POWERSHIFT GEARBOX IN MOTOR VEHICLES

摘要

PCT No. PCT/EP88/00254 Sec. 371 Date Oct. 3, 1989 Sec. 102(e) Date Oct. 3, 1989 PCT Filed Mar. 26, 1988 PCT Pub. No. WO88/08086 PCT Pub. Date Oct. 20, 1988.A hydraulic pressure-control device, specially for powershift transmissions of motor vehicles, comprises a fluid pump (1) and a main valve for regulating the pressure in at least one high-pressure consumer device (6), which is attached to a pressure pipe (3) between the fluid pump (1) and the main pressure valve. The main pressure valve is designed as pressure-relief valve. In the main pressure valve is integrated the operation of a second pressure-relief valve. Two different pressure limits can be adjusted in the pressure pipe (3) by a valve piston (21) through two compression springs (17, 18) connected in parallel of which one compression spring (18) is bound.