CLUTCH HYDRAULIC DRIVER IN INDUSTRIAL VEHICLE

摘要

PURPOSE:To disengage a gear with a clutch completely shut by providing in a clutch circuit a gate valve which is usually held at a close position and is opened by operating pressure of a hydraulic actuator, when a gear of a manual transmission is changed, for permitting clutch pressure to escape to a tank. CONSTITUTION:When a gear position of a manual transmission is changed, a gate valve 15 of a clutch circuit 8 is opened by operating pressure generated in a control circuit 4 of a gear changing hydraulic actuator (shift booster for advance and retreat) 5 to permit clutch pressure to escape to a tank 2, so that working pressure of the gate valve 15 is set lower than the operating pressure of the hydraulic actuator 5. Thus operation of shutting the clutch can go ahead of gear positions.