192 clutches and power-stop control – Clutches – Operators
Patent
1998-09-04
2000-03-14
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Operators
192 91A, 277560, 277566, F16D 2508
Patent
active
060359900
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a disconnecting device for a friction clutch of motor vehicles, including a slave cylinder which can be acted upon by means of a hydraulic fluid, and which contains a pressure housing attached to the front of a gear box housing and arranged concentrically around a drive shaft, whereby a guiding sleeve is arranged at a distance radially toward the drive shaft in a longitudinal bore in the pressure housing in which a ring piston is movably guided and which delimits a pressure chamber axially, whereby for sealing, the ring piston has a piston seal which is provided with sealing lips spread apart in the shape of a V.
Disconnecting devices generally of this type for use in connection with manual transmissions are known from numerous publications, for example U.S. Pat. No. 1,336,564. For sealing the pressure chamber, this publication discloses a ring piston seal with a symmetrical construction in connection with which the radially inner sealing lip as well as the radially outer sealing lip lie sealing on the guiding sleeve and bore wall of the pressure housing spread apart from each other in a V shape. Based on the differences in diameter between the sealing lips, sealing surfaces which deviate from each other result such that a contact force of the sealing lips similarly differs. From this it follows that with an axial movement of the ring piston on the radially outer sealing lip, greater forces of friction arise in comparison to the radially inner sealing lip. As a consequence of this, no consistent wear and tear pattern is established between the inner and outer sealing lip. The different stress upon the sealing lips in relation to each other can moreover lead to a disadvantageous extrusion of the outer sealing lip, or to a twisting of the seal, which brings about an impairment of function.
A radial seal with a U-shaped cross sectional profile is known from DE-U 88 01 765. The construction of this sealing ring provides a so-called connecting leg which is configured as a circular ring-shaped disk. Legs of identical length oriented in an axial direction are formed on the connecting leg on the inner and outer contour. The inner sealing leg moreover possess a lesser wall strength in comparison with the outer clamping leg. A sealing lip is assigned to both legs in the end region. Due to the large axial construction length and the great instability associated with this (especially of the inner sealing leg), this radial sealing ring is not suited for installation in a disconnecting device.
SUMMARY OF THE INVENTION
For this reason, underlying the invention is the object of creating a seal for a hydraulic disconnecting device which has identical stress in both sealing lip cross sections, the functional safety and efficiency of which is improved, as well as being able to prevent an extrusion without affecting manufacturing costs and assembly.
The above-noted object is accomplished in accordance with the invention with a hydraulic disconnecting device for a friction clutch which includes a slave cylinder which can be acted upon by means of hydraulic fluid and which contains a pressure housing arranged concentrically to a gear box input shaft attached on a gear box housing. A guiding sleeve is arranged on the pressure housing radially at a distance to the gear box input shaft and to a longitudinal bore in the pressure housing upon which a ring piston is axially guided and movable, and axially delimits a pressure chamber. For sealing the pressure chamber, the ring piston has a seal on the pressure chamber side which is provided with V-shaped, spread apart sealing lips. The inventions relate to seals the cross section profile of which provides sealing lips arranged asymmetrically in relation to each other, as well as sealing lips which have a different length from each other. Common to both inventions is the dynamic sealing effect of the sealing lips which form a sliding sealing surface with the associated contact surface of the longitudinal bore in the pressure housin
REFERENCES:
patent: 1336564 (1920-04-01), Jennings
patent: 4585106 (1986-04-01), Shirley
patent: 4821627 (1989-04-01), Leigh-Monstevens
patent: 5287951 (1994-02-01), Voit et al.
patent: 5307915 (1994-05-01), Grosspietsch et al.
patent: 5458224 (1995-10-01), Takano
German Search Report dated Sep. 16, 1996 for Application No. 196 14 385.3.
Simrit-Werk brochure, pp. 10 and 11, dated Jun., 1972.
Martin Merke GmbH product information brochure, dated May, 1982.
International Search Report dated Feb. 21, 1997 for International Application No. PCT/EP96/05221.
Bonck Rodney H.
Luk Lamellen und Kupplungsbau
LandOfFree
Seal for a ring piston of a hydraulic clutch disconnecting devic does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Seal for a ring piston of a hydraulic clutch disconnecting devic, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Seal for a ring piston of a hydraulic clutch disconnecting devic will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-160776