| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electronic control throttle body enabling a rotary shaft of a sun gear and a planetary carrier to be precisely assembled. Ž<P>SOLUTION: The electronic control throttle body is provided with a body 4 having an air intake passage formed in it, a valve stem 7 rotatably supported in the body, a throttle valve fixed with the valve stem in the air intake passage and provided with a valve element 9 capable of varying an opening area of the air intake passage and a motor 3, connected with the valve stem via a speed reduction mechanism 2 for rotating the valve element. The speed reduction mechanism 2 consists of a planetary gear speed reduction mechanism provided with the sun gear 12 fixed with a shaft of the motor, an inner gear 14 formed around the sun gear, the planetary gear 13 meshing with the sun gear and the inner gear and the planetary carrier 16, connected with the planetary gear, having a small gear 17 for rotating coaxially with the motor and a spur gear speed reduction mechanism meshing with the small gear of the planetary gear speed reduction mechanism and having a large gear 18 for transmitting rotation of the motor to the valve stem. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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