Forklift gasoline pump role, structure and working principle:
1, the role of the fuel pump: is to suck out the gas from the tank, and pressure to the carburetor float chamber.
2, gasoline pump structure: mechanical drive diaphragm, installed on the side of the engine crankcase, driven by the camshaft cam with eccentric gear. The pump body is divided into the upper body and the lower body, and the upper body is provided with an oil inlet valve and an oil outlet valve which are die-casted by the zinc alloy. The cover and the upper body are clamped with a gasket at the joint surface so that the oil-out chamber is sealed. Coated with oil-resistant rubber cloth membrane, with a screw clamp between the upper body and the lower body, forming a pump oil chamber above. Diaphragm and retaining plate with a nut locked in the upper end of the rod, and by the role of the diaphragm spring arch upward, the spring seat with the lower seal, prevent leakage of gas leaked diaphragm. One end of the inner rocker arm is inserted into the square hole of the pull rod, and the other side is in contact with the outer rocker arm ramp and is sleeved on the rocker arm shaft. One end of the shaft is provided with a hand crank for manual pumping oil.
3, the working principle: When the engine is running, when the convex tip of the eccentric wheel pushes the swinging arm to swing, it will drive the swinging arm and pull down the diaphragm through the pull rod. As a result, the volume of the pump oil chamber increases, the oil pressure drops, The valve is closed, the inlet valve is sucked open, and the gas flows into the pump chamber from the inlet tubing. When the convex tip of the eccentric wheel leaves the outer rocker arm, the outer rocker arm is returned under the action of the return spring, the inner rocker arm is driven out of the outer rocker arm, and the diaphragm is arched upwards under the action of a spring, so that the volume of the pump oil chamber decreases Small, hydraulic rise, close the inlet valve, push out the valve, the gasoline into the carburetor through the tubing. When not required, because the float chamber needle valve closed, the oil chamber resistance will be more than the elastic diaphragm spring, the diaphragm down to the lowest position, the pump oil will stop completely. Before starting the engine, if it is found that there is no oil in the float chamber or there is too little oil in the chamber, you can pull the arm pump oil. When the float chamber is filled with gasoline, the jib boom will become empty and pump oil stops.
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