Patent ID: 7703580
Filing Date: 2010-04-27
Classification: B60T

Abstract:
1. An actuator for an electromechanical brake, the actuator comprising a pusher and a first drive member arranged to move the pusher in register with a stack of disks and to apply a braking pressure to the stack of disks, the actuator including a second drive member comprising a piezoelectric assembly suitable for modulating the braking pressure applied to the stack of disks, wherein the piezoelectric assembly is embedded within a fixed part of said actuator that is not movable; and said actuator further comprising: a housing in which the pusher slides along a sliding axis; a sleeve disposed inside the housing around the pusher to turn about said sliding axis and connect the sleeve to said pusher via a helical connection; an electric motor forming the first drive member which is disposed inside the housing around the sleeve and which is arranged to drive said sleeve in rotation; and the piezoelectric assembly which is tubular in shape and which is disposed inside the housing and around the electric motor, said piezoelectric assembly having a stationary end and another end forming an axial abutment for the sleeve, the piezoelectric assembly being arranged to cause the sleeve to move in a direction parallel to the sliding axis.