POWER HYDRAULIC SYSTEM

摘要

PCT No. PCT/GB89/00092 Sec. 371 Date Sep. 13, 1990 Sec. 102(e) Date Sep. 13, 1990 PCT Filed Feb. 1, 1989 PCT Pub. No. WO89/08786 PCT Pub. Date Sep. 21, 1989.A motor vehicle has a manually operated change speed gearbox driven by an internal combustion engine through a clutch which is automatically disengageable and re-engageable by operation of a power hydraulic clutch control. The hydraulic control comprises a fluid reservoir connected by a conduit to a control valve connected to the reservoir by a conduit which includes a pump and a one-way valve and a pressure accumulator and a piston and cylinder or fluid pressure operated actuator connected by piping to the control valve. The clutch is operated by the actuator causing disengagement of the clutch when the control valve is operated to relieve fluid pressure in the actuator. The hydraulic control is assembled and filled with hydraulic fluid at some place which can be distant from the vehicle manufacturer's production line. The filled control is transported to where the vehicle is being made and the control is installed in the vehicle; possibly after the filled control has been stored first.