Patent ID: 6974119

Claim:
An actuator unit, comprising an actuator housing ( 2 ); a conduit ( 4 ) in the actuator housing ( 2 ), a throttle body ( 6 , 6 a , 6 b ), supported rotatably in the actuator housing ( 2 ) and adjustable over an adjustment range, for controlling a free cross section in the conduit ( 4 ); a control motor ( 20 ) with a drive shaft ( 14 c ) having a pinion gear ( 14 a ) mounted thereon for adjusting the throttle body ( 6 , 6 a , 6 b ); the pinion gear ( 14 a ) engaging an intermediate wheel ( 14 b ) of a speed-increasing gear ( 10 , 12 , 12 a , 12 b , 14 b ) for converting an adjustment motion of the drive shaft ( 14 c ) to an adjustment motion of the throttle body ( 6 , 6 a , 6 b ), the speed-increasing gear ( 10 , 12 , 12 a , 12 b ) having at least one pair of wheels ( 12 , 12 a , 12 b ), including one wheel ( 12 a ) associated with the control motor and one wheel ( 12 b ) associated with the throttle body, the wheel ( 12 a ) associated with the control motor and the wheel ( 12 b ) associated with the throttle body, upon adjustment of the throttle body ( 6 , 6 a , 6 b ) over the adjustment range are in engagement with one another each between a first engagement end (e 1 , E 1 ) and a second engagement end (e 2 , E 2 ), the wheel ( 12 a ) associated with the control motor, between its first engagement end (e 1 ) and its second engagement end (e 2 ), having a varying rolling curve radius (r) associated with the control motor; and the wheel ( 12 b ) associated with the throttle body, between its first engagement end (e 1 ) and its second engagement end (e 2 ), having a rolling curve radius (R) associated with the throttle body that varies in complementary fashion to the rolling curve radius (r) associated with the control motor.