When the fuel injection pump is working, under the action of the cam and the plunger spring on the camshaft of the fuel injection pump, the plunger is forced to reciprocate up and down to accomplish the pump oil task. The pump oil process can be divided into the following three stages. 1, into the process of oil When the convex portion of the cam turn, under the action of the spring force, the plunger down, the upper space of the plunger (called the pump chamber) to produce a vacuum, when the plunger on the end face of the column After the oil inlet hole on the plug sleeve is opened, the diesel fuel filled in the upper body oil passage of the oil pump enters the oil pump chamber through the oil hole, and the plunger moves to the bottom dead center, and the oil enters the end. 2, the fuel supply process When the cam shaft to the raised part of the cam lift the roller body, the plunger spring is compressed, the plunger upward movement, the fuel pressure, part of the fuel flow through the hole back to the upper body oil injection pump. When the plunger top cover the upper edge of the sleeve into the oil hole, due to the small clearance between the plunger and sleeve (0.0015-0.0025mm) so that the top of the plunger pump chamber becomes a sealed oil chamber, the plunger Continue to rise, the pump oil chamber pressure rapidly increased, pump oil pressure> spring force of the valve + high pressure tubing remaining pressure, open the valve, high pressure diesel oil into the high pressure tubing through the injector spray Into the combustion chamber. 3, back to the process of plunger upward oil supply, when up to the plunger on the chute (stop for the edge) and the sleeve connected to the oil return hole, low pressure oil pump chamber and the plunger head in the middle Hole and radial hole and oblique groove communication, a sudden drop in pressure, the oil valve in the spring force quickly closed, stop the fuel supply. After the plunger has to go up, when the convex part of the cam turn, under the action of the spring, the plunger down again. At this point they started the next cycle.
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Application:
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Shenzhen Wenyi Lighting Technology Co., Ltd , https://www.szwygrow.com