Patent ID: 7337883

Claim:
A linear electromechanical actuator of the screw type for controlling a parking brake of a motor vehicle, comprising: a stationary rigid casing fixable to a vehicle, a motor with an associated first gear reduction unit for imparting a rotational movement about a longitudinal axis to an output pinion, a tubular nut element having an external thread co-operating with a thread fixedly joined to the casing in order to make the nut perform screwing movements about and along said axis, and the tubular nut element having an internal thread opposite the external thread, drive means for transmitting a rotary motion from the output pinion to the nut, a longitudinal rod having a first threaded length which co-operates with the internal thread of the nut, and a second length having a non-circular transversal cross-section, connecting means for connecting the rod to at least one flexible cable for operating a parking brake, anti-rotation means co-operating between the casing and the second length of the rod to prevent the rotation of the rod about said axis, wherein the rod is translatable longitudinally along said axis in response to the rotary movement imparted by the motor; wherein said drive means include a first straight spur gear rotatable about a respective axis parallel to the longitudinal axis, and wherein said spur gear includes: a pinion portion of increased diameter meshing with the output pinion, and an axially elongate splined shaft portion meshing with a pinion member, wherein the pinion member is integral with the nut.