| 摘要 |
PURPOSE:To stably prevent a throttle valve from being caught into the wall face of an intake cylinder by providing a limiting member for limiting a rotation in a valve closing direction near a totally closed position, on a throttle valve shaft part in between a bearing part for removably supporting said throttle valve shaft and a gear mechanism for transmitting the rotation of a motor to said throttle valve shaft. CONSTITUTION:When an accelerator 9 is stepped in, a stepping motor 5 is rotated in accordance with the output of an accelerator opening detector 8 via a control circuit 6, thereby, rotating a throttle valve shaft 3 via a gear mechanism 11, to control the opening of a throttle valve 2. The opening of the throttle valve 2 is detected by a throttle valve opening detecting device 4, the output of which feedback controls the stepping motor 5. In this case, a limiting member 14 is provided on a throttle valve shaft part in a position between a bearing part on the motor installing side for removably supporting the throttle valve shaft 3 and the gear mechanism 11, to prevent the throttle valve 2 from rotating beyond a part at which the valve 2 is brought into contact with an adjusting screw 12 when it is rotated to a defined position near a totally closed position.
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