Working principle of manual oil pump

The principle is as follows: 1. The process of oil absorption and pressurization is completed by the reciprocating motion of the plunger in the plunger sleeve. When the plunger is in the low position, two oil holes in the plunger sleeve are opened, and the inner cavity of the plunger sleeve is communicated with the oil passage in the pump body, so that the fuel quickly fills the oil chamber. When the cam pushes the roller of the roller body, the plunger rises. Move upward from the plunger until the oil hole is blocked by the upper end face of the plunger. When the plunger blocks the oil hole, the oil pressing process begins. When the plunger rises, the oil pressure in the oil chamber rises sharply. When the pressure exceeds the spring force and upper limit oil pressure of the oil outlet valve, the oil outlet valve is pushed open, and the fuel is pressed into the oil pipe and sent to the injector.

2. Oil quantity adjustment: the adjustment of oil supply is realized by making all plungers of the fuel injection pump rotate at the same time through the rack and rotating sleeve. When the plunger rotates, the start time of oil supply remains unchanged, while the end time of oil supply changes because the oblique side of the plunger changes the position of the oil return hole of the plunger sleeve. With the different rotation angle of the plunger, the effective stroke of the plunger is also different, so the oil supply also changes.