Patent ID: 6325194
Filing Date: 2001-12-04
Classification: B21C,F16D,Y10T

Abstract:
A hydraulically controlled declutching device (100) for a clutch for a motor vehicle, comprising a body (2) for fastening the declutching device on a fixed part, a metallic guide tube (4) fixed to the body (2) and arranged for a shaft (101) to pass through it, an axially oriented annular blind cavity (40) formed in an assembly that consists of the body (2) and the guide tube (4), for receiving a control fluid, a piston (3) which firstly penetrates into the blind cavity (40) so as to define a variable volume control chamber, and which, secondly, is mounted for axial sliding movement along the guide tube (4), and an actuating element (11) carried by the piston (3) for acting on the declutching device (100) of the clutch, wherein the blind cavity (40) is formed in the guide tube (4) and has an inner tube (407) for guiding the piston (3), the inner tube being surrounded by a concentric outer tube (405), together with a base portion (41) which joins together the inner tube (407) and the outer tube (405), characterised in that the guide tube (4) is formed by impact drawing from a metal slug (402, 1402).