Throttle positioner

A throttle positioner for a throttle valve of an automobile engine having a rotary shaft, comprising:

• a lever fixedly mounted on said roatry shaft;
• a lever driving element mounted on said rotary shaft to be freely rotatable with respect to said shaft and adapted to drive said lever in a direction to open said throttle valve;
• said lever and said lever driving element individually having lugs confronting each other;
• said lug and said lever driving element supporting an adjusting screw threadably mounted thereto;
• said adjusting screw having a tip end which drivingly abuts against said lug of said lever, whereby movement of said screw supported by said lever driving element in a first direction imparts motion of said lever;
• a diaphragm means drivingly connected to said lever driving element so as to drive said lever in a first direction to ensure that said throttle valve is opened at least to a throttle positioner preset opening when a vacuum is applied thereto;
• said lever driving element being adapted to release said lever in a second direction opposite to said first direction when atmospheric pressure is applied thereto;
• passage means for supplying the manifold vacuum or atmospheric pressure to said diaphragm means;
• an electro-magnetic valve which controls said passage means to selectively supply the manifold vacuum or atmospheric pressure through said passage means, and
• an electric circuit means for controlling said electro-magnetic valve in accordance with the operational conditions of the vehicle which incorporates the throttle positioner.