FLUID PRESSURE CONTROLLED WINCH MECHANISM

摘要

FLUID PRESSURE-CONTROLLED WINCH MECHANISM A winch drum carrying a cable is supported by drive mechanism which includes a normally disengaged drive input clutch that is engageable in response to pressurized fluid to reel in cable. A normally engaged disconnect clutch disengages in response to fluid pressure to free the drum for rotation independently of the drive mechanism. A normally engaged brake immobilizes the drive mechanism except when released by fluid pressure. A control valve provides for directing pressurized fluid to appropriate ones or combinations of the clutches and brake as necessary to establish any of four operational conditions including Reel-In, BrakeOn, Brake-Off and Disconnect modes of operation. A check valve between the flow lines that connect the control valve to the input clutch and to the brake- assures that there is no momentary overlapping of engagements of both the input clutch and the brake when the Reel-In mode of operation is initiated or terminated.