Intake throttle valve apparatus

摘要

An intake throttle valve apparatus comprising a throttle valve ( 1 ) including a housing ( 4 ), a valve shaft ( 7 ) rotatably supported within the housing ( 4 ) and a valve element ( 9 ) fixed on the shaft ( 7 ) for changing an opening area of an intake passage ( 8 ), a reduction gear train ( 2 ) operatively coupled to the throttle valve ( 1 ), and an electric motor ( 3 ) coupled to the gear train ( 2 ) so that a driving force of the driving motor ( 3 ) is transmitted to the valve shaft ( 7 ) through the gear train ( 2 ) for changing the opening area of the intake passage ( 8 ) by rotating the valve element ( 9 ). The gear train ( 2 ) includes an output gear ( 12 ) secured to a motor shaft ( 11 ) of the motor ( 3 ) and an input gear ( 13 ) secured to the valve shaft ( 7 ) at one end and directly meshing with the output gear ( 12 ).