PRESSURE ADJUSTER FOR HYDRAULIC CLUTCH

PURPOSE:To permit rapid and soft clutch putting operation by maintaining high working-oil pressure until the switching and setting to advance or retreat and keeping the oil pressure to a low pressure after setting, when the pressure of a hydraulic clutch installed into a power transmission passage for a propeller from a vessel engine is adjusted. CONSTITUTION:The working oil discharged from a hydraulic pump is supplied into each clutch for advance and retreat through a selector valve 2 for manual switching between advance, retreat, and neutral, and an automatic two-stage pressure adjusting valve 5 is installed at the prescribed position in a working- oil feeding passage. Said pressure adjusting valve 5 allows a drain port 37 for low working-oil pressure to directly communicate to the selector valve 2. When a remote control handle is at neutral position, the drain port 37 is closed by the selector valve 2, and high pressure state is maintained by a drain port 38 for high working-oil pressure. When the force applied onto the handle 21 is weakened, the handle is returned in the state where the handle 21 and the selector valve 2 are set at the advance or retreat state, and the drain port 37 is opened to keep the working-oil pressure to a low pressure.