Patent ID: 7588014
Filing Date: 2009-09-15
Classification: F02D,F02M,Y02T

Abstract:
1. An electronically-controlled throttle body, comprising: a throttle valve having a valve disc, fixed on a valve shaft rotatably supported in a body inside which an air-intake passage is formed, for varying an opening area of the air-intake passage; a reduction gear mechanism connected to the valve shaft of the throttle valve; a sensor for detecting a rotation angle of the valve shaft; and a motor connected to the reduction gear mechanism; rotational drive power from the motor being transmitted to the valve shaft via the reduction gear mechanism, and the opening area of the air-intake passage being varied by rotatably moving the valve disc; wherein the reduction gear mechanism includes a planetary gear mechanism having a sun gear, a planetary gear, an internal gear and a carrier, and a spur gear reduction gear mechanism; rotational drive power from the motor is decelerated by the planetary gear mechanism; and the decelerated rotational drive power by the planetary gear mechanism is further decelerated by the spur gear reduction gear mechanism so as to be transmitted to the valve shaft.