Plunger lifting mechanism of a rotary-valve gas carburetor

A plunger lifting mechanism of a rotary-valve gas carburetor comprising a carburetor body (1), a cam (2), a plunger (3), a torsion spring (5), a fixed plate (6), a throttle wire bracket (7), a main measuring needle (8), a sleeve (9) and a main jet pipe (10);

• wherein the cam (2) is connected in the carburetor body (1), and a through hole is defined at a center of the cam (2) to allow the plunger (3) to pass, the cam (2) has a top surface that is a spiral surface including two identical and symmetrical spiral sub-surfaces;
• the plunger (3) is rotatablely mounted in the carburetor body (1), which passes through the cam (2), the torsion spring (5) and fixed plate (6) in turn and then extends out of the carburetor body (1), and a top of the plunger (3) is connected with the throttle wire bracket (7) and then fixedly connected with the sleeve (9);
• the fixed plate (6) is fixedly connected with the carburetor body (1);
• one end of the torsion spring (5) is elastically suppressed by the fixed plate (6), and the other end of the torsion spring (5) is elastically suppressed by protrusions on side walls of the plunger (3);
• the plunger (3) is provided with two pins on each of which a roller (4) is mounted, and the two rollers (4) are contacting with the two spiral sub-surfaces of the cam (2);
• the main measuring needle (8) sleeved with a spring (12) is fixed in the plunger (3), which is cooperated with the main jet pipe (10) to constitute an injector.