| 摘要 |
In a tandem valve type throttle body in which a sub throttle valve lever and a throttle valve lever are connected by a transmission member, a freedom of mounting characteristic to a motor cycle is improved by making a motor for driving a sub throttle valve shaft compact. The tandem valve type throttle body is provided with a throttle valve 4 in a downstream side of an intake passage 2, and with a sub throttle valve 9 in an upstream side thereof. The sub throttle valve shaft 8 is rotated and controlled by a motor M, and a sub throttle valve lever 10 and a throttle valve lever 5 are connected to each other by a transmission member. The sub throttle valve shaft 8 and a sensor rotor TA of an opening degree sensor Tare energized in an opening direction of the sub throttle valve shaft 9 by a rotor spring TC, and a link lever spring 14 which presses the transmission member 12 to one direction is energized in a closing direction of the sub throttle valve 9. A torque is set in such a manner as to cancel spring forces applied to the sub throttle valve shaft 8 by both of the springs TC, 14.
|
