Throttle valve for motor vehicle engine, has valve drive motor circuit housed in valve housing parallel to valve shaft and water path in housing to circulate engine cooling water to cool drive control circuit

摘要

The throttle valve has a motor to drive. The motor drive control circuit (19) is accommodated in the throttle valve housing in an enclosure (5) parallel to the valve drive shaft (8). A cooling water path (22) is arranged in the housing between the valve chamber and the drive circuit enclosure to circulate engine cooling water to cool the drive circuit.