US 6,981,429 B2
Actuating device, especially a hydraulic or pneumatic actuator, for transmissions of vehicles, particularly motor vehicles
Dieter Maisch, Kohlberg (Germany); Hartmut Weber, Altdorf (Germany); and Alfred Trzmiel, Grafenberg (Germany)
Assigned to Hydraulik-Ring GmbH, Marktheidenfeld (Germany)
Filed on Sep. 10, 2003, as Appl. No. 10/605,123.
Claims priority of application No. 102 43 047 (DE), filed on Sep. 10, 2002.
Prior Publication US 2004/0123690 A1, Jul. 01, 2004
Int. Cl. F16H 59/00 (2006.01); F16J 1/10 (2006.01)
U.S. Cl. 74—335 33 Claims
OG exemplary drawing
 
1. An actuating device for a transmission of a motor vehicle, the actuating device comprising:
a housing;
two pistons moveably arranged in the housing;
a coupling part arranged between the two pistons and acted on by the two pistons so as to be moved by the two pistons, wherein the coupling part is configured to connect to a shifting part of the transmission and is comprised, at least on a surface of the coupling part, of wear-resistant material;
wherein the two pistons are loosely mounted on the coupling part so as to have radial play relative to the coupling part.