Hydraulic regulating device for load shifted gears

US4395927A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Alfred Muller · Krefeld, DE
• Joseph Sauer · Strullendorf, DE
• Manfred Schwab · Gerlingen, DE
• Meinrad Feder · Leonberg, DE
• Achim Schreiber · Schwieberdingen, DE

Key dates

• Filing date: Oct 23, 1980
• Grant date: Aug 2, 1983
• Expiry date: Oct 23, 2000

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2061/026
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

The hydraulic regulating device for an automatic transmission system in motor vehicles having a plurality of hydraulic couplings, includes a single pressure build-up regulating valve and a single pressure decrease regulating valve and assigned to each coupling a solenoid operated directional control valve having its working port connected to the couplings, its pressure port connected via a switch-on reversing valve to the pressure build-up regulating valve, and its return port connected via a switch-off reversing valve to a return conduit; both reversing valves are controlled according to predetermined pressure levels on the coupling so that in the working position of the switch-on reversing valve the coupling is connected to a stable high pressure and when the coupling process is initiated by reversing the position of the directional control valve, the switch-off reversing valve connects the coupling element to the pressure decrease regulating valve.