Patent AT-E401670-T1: [Translated] IMPROVEMENT OF FRICTION MATERIALS

The actuator has a sliding sleeve (1), and an active piston (2) that slides axially in the sleeve and includes with sections (4) made of multi-layers of piezoelectric ceramic. Each piston section has electrodes which control the sections in an independent manner. The sleeve and the piston have, at their interface, a couple of friction layers (3) made of materials with static and dynamic coefficient of friction greater than 0.6.