Patent ID: 7891477
Filing Date: 2011-02-22
Classification: F16D,F16J

Abstract:
1. A clutch assembly for an agricultural work vehicle comprising: a piston slidably disposed within a chamber having a first portion and a second portion, the piston being positionable between a first position and a second position in response to a fluid pressure within the first portion of the chamber to actuate a clutch mechanism; a sealing ring being associated with the piston for movement therewith, to substantially prevent a flow of fluid between the first portion and the second portion when the piston is in the second position; a bleed assembly is arranged and disposed to permit the flow of fluid between the first portion and the second portion when the piston is in the first position, the bleed assembly configured to permit flow by directing the flow of fluid past the sealing ring through a passage between an outward peripheral surface of the piston and the chamber; and wherein the bleed assembly is configured into the sealing ring, the sealing ring having a variable diameter wherein flow of fluid is permitted at a first diameter and flow of fluid is substantially prevented at a second diameter and the chamber being configured to receive the sealing ring at varying diameters in response to piston position.