Patent ID: 7334403
Filing Date: 2008-02-26
Classification: F16H

Abstract:
1. A control system for a hydrostatic transmission in an open circuit comprising a hydraulic pump, provided for delivery to a first pump-side main line or a second pump-side main line, and a hydraulic motor, connected to a first motor-side main line and second motor-side main line, and comprising a brake valve unit, via which the first pump-side main line is connectable to the first motor-side main line and the second pump-side main line is connectable to the second motor-side main line, wherein the first motor-side main line or second motor-side main line, situated downstream of the hydraulic motor, is connectable to a tank volume in a throttled manner by means of the brake valve unit in dependence on the pressure prevailing in said lines, the brake valve unit comprising a brake valve with a first measuring surface, and the brake valve is subjected to a brake pressure at the first measuring surface counter to a spring force, which pressure is dependent on the pressure prevailing in the first motor-side main line or second motor-side main line, situated downstream of the hydraulic motor, a pilot control valve that is connected on the outlet side to the first measuring surface of the brake valve, being provided to produce the brake pressure, and wherein the pilot control valve is connected on the inlet side, via a shuttle valve, to the first motor-side main line or second motor-side main line, respectively.