WINCH VALVE DRAG BRAKE CONTROL

摘要

WINCH VALVE DRAG BRAKE CONTROL A B S T R A CT A winch has a powered rotatable drum for winding in and releasing a cable, and the drum is driven and controlled by fluid pressure operated clutches and brakes. A one-way clutch is associated with the brake and allows said drum to rotate in a reel-in direction when said brake is engaged. An auxiliary brake is provided for stopping reel-in rotation of said drum caused by viscous drag of hydraulic fluid on the drive means when a valving element is in the Brake-On position. A fluid flow directing system is located intermediate a winch lubricating system and the auxiliary drag brake. It directs fluid flow from the winch lubricating system to the auxiliary drag brake responsive to shifting of the valving element to a Brake-On position, and blocks the fluid flow from the winch lubricating system to the auxiliary drag brake responsive to shifting of the valving element to any Brake-Off, Reel-In or Free-Spool positions.