Patent ID: 6035990
Filing Date: 2000-03-14
Classification: F16D,F16J

Abstract:
Disconnecting device for a motor vehicle friction clutch including a slave cylinder which can be acted upon by means of a hydraulic fluid and which contains a pressure housing (2) arranged concentrically to a gear box input shaft (3) attached on a gear box housing (4), whereby a guiding sleeve (6) is arranged on the pressure housing (2) radially at a distance to the gear box input shaft (3) and to a longitudinal bore (5) in the pressure housing upon which a ring piston (7) is axially guided and movable, which axially delimits a pressure chamber (8), whereby for sealing the pressure chamber, the ring piston (7) has a seal (12) on a pressure chamber side which is provided with V-shaped, spread apart sealing lips (13, 14), the seal (12) has a cross sectional profile with the sealing lips (13, 14) being arranged asvmmetrically in relation to each other which from a seal edge (17, 18) proceeding toward a free end of the sealing lips (13, 14), is configured as a cylindrical segment, the radially outer sealing lip (14) having a greater wall thickness than the radially inner sealing lip (13), and an axial dimension of the inner sealing lip (13), proceeding from a back of the seal (19), exceeds an axial dimension of the outer sealing lip (14), the seal (12) has an outer contour course in the area of the sealing lips (13, 14) which includes a radius ""R.sub.1 "" in a transition zone between a cylindrical segment at the free end of the sealing lips (13, 14) and a segment ""t"" directed obliquely in the direction of the back of the seal (19) proceeding from the seal edge (17, 18) at an angle "".alpha."" of 24 30.degree., and a tangential point ""T.sub.1 "" of the radius ""R.sub.1 ""/ on the segment ""t"" is provided at a distance from or in the same location as a further tangential point ""T.sub.2 "" of a radius ""R.sub.2,"" which is provided in a transition zone between the back of the seal (19) and the segment ""t.