Patent ID: 8448627
Filing Date: 2013-05-28
Classification: F02D

Abstract:
1. An electronically-controlled throttle valve control device, comprising: a throttle body having an air intake passage formed therein; a throttle valve that is received in the air intake passage so as to close and open the air intake passage; a power transmission device having a rotating body that is capable of transferring a rotative force of an actuator to the throttle valve and rotating the throttle valve in a fully opening direction and a fully closing direction; and a coil spring having one end portion that is engaged with the throttle body and the other end portion that is engaged with the rotating body, the coil spring being arranged and constructed to bias the throttle valve in the fully opening direction or the fully closing direction; wherein the rotating body has a spring guide that is capable of supporting the coil spring from inside and has an opener member that is biased by the coil spring in the fully opening direction or the fully closing direction, wherein the coil spring includes a first spring portion that is capable of biasing the throttle valve via the opener member in a direction in which the throttle valve can be closed from a position opened beyond the middle position toward the middle position, a second spring portion that is capable of biasing the throttle valve via the opener member in a direction in which the throttle valve can be opened from a position closed beyond the middle position toward the middle position, and a winding direction changeover portion in which winding directions of the first and second spring portions are changed over, wherein the coil spring is mounted such that a coiled portion positioned adjacent to the winding direction changeover portion is positioned radially outwardly relative to a remaining coiled portion; and wherein the first spring portion has the same coil diameter as the second spring portion.