Patent ID: 7520209

Claim:
A servo ( 1 ) for a gear change provided with a control shaft ( 2 ); the servo ( 1 ) comprising: a first actuator ( 5 ), which displaces the control shaft ( 2 ) axially along a central axis ( 3 ) thereof and is directly coupled to the control shaft ( 2 ); a second actuator ( 6 ), which renders a cam ( 12 ) engaged by a pin ( 11 ) projecting from the control shaft ( 2 ) angularly fixed to a fixed frame ( 4 ) to cause rotation of the control shaft ( 2 ) about its central axis ( 3 ) during the axial displacement; and a cylindrical tubular element ( 13 ), which is coaxial to the control shaft ( 2 ), receives inside it an end portion of the control shaft ( 2 ), supports the cam ( 12 ), and is pushed axially by the second actuator ( 6 ) against the fixed frame ( 4 ); the servo ( 1 ) is characterized in that the tubular element ( 13 ) has a conical portion that is pushed by the action of the second actuator ( 6 ) against a conical seat ( 19 ), which has a shape complementary to that of the conical portion of the tubular element ( 13 ) and is carried by the fixed frame ( 4 ).