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How does the automobile oil pump work without oil

In the process of oil absorption and pressure, the oil absorption and pressure of the fuel injection pump are completed by the reciprocating movement of the plunger in the plunger sleeve. When the plunger is in the lower position, the two oil holes on the plunger sleeve are opened, the inner cavity of the plunger sleeve is connected with the oil passage in the pump body, and the fuel quickly fills the oil chamber. When the cam pushes onto the roller of the roller body, the plunger rises, Move upward from the beginning of the plunger until the oil hole is blocked by the upper end face of the plunger.


During this period of time, due to the movement of the plunger, the fuel is squeezed out of the oil chamber and flows to the oil passage, so this lift is called pre stroke. When the plunger blocks the oil hole, the oil pressure process begins. The plunger goes up and the oil pressure in the oil chamber rises sharply. When the pressure exceeds the spring force of the oil outlet valve and the upper oil pressure, the oil valve is pushed out and the fuel is pressed into the oil pipe and sent to the fuel injector.


The time when the oil inlet hole on the plunger sleeve is completely blocked by the upper end face of the plunger is called the theoretical oil supply starting point. When the plunger continues to move upward, the oil supply also continues. The oil pressing process continues until the helical bevel on the plunger leaves the oil return hole of the plunger sleeve. As soon as the oil hole is opened, The high-pressure oil of the truck oil pump flows back to the oil passage in the pump body from the oil chamber through the longitudinal groove on the plunger and the oil return hole on the plunger sleeve. At this time, the oil pressure in the plunger sleeve oil chamber decreases rapidly, the oil outlet valve falls back to the valve seat under the action of the oil pressure in the spring and high-pressure oil pipe, and the fuel injector stops fuel injection immediately. At this time, although the plunger continues to rise, the oil supply has been terminated.


Oil quantity adjustment in order to meet the requirements of diesel engine load, the oil supply quantity of fuel injection pump must be able to be adjusted from the maximum oil supply quantity (full load) to zero oil supply quantity (shutdown). The oil supply quantity is adjusted by rotating all plungers of fuel injection pump at the same time through toothed rod and rotating sleeve. When the plunger rotates, the oil supply start time remains unchanged, while the oil supply end time, Then, due to the change of the inclined edge of the plunger to the position of the oil return hole of the plunger sleeve, the effective stroke of the plunger will be different with the different rotation angle of the plunger, so the oil supply will also change. The greater the rotation angle of the plunger to the non oil supply position 1, the greater the distance from the upper end face of the plunger to the inclined edge of the oil return hole of the plunger sleeve, and the greater the oil supply, If the rotation angle of the plunger is small, the oil cut-off starts earlier and the oil supply is smaller than that of the cab oil pump.


When the diesel engine stops, the oil must be cut off. Therefore, turn the longitudinal groove on the plunger to the oil return hole on the plunger sleeve. At this time, during the whole plunger stroke, the fuel in the plunger sleeve always flows through the longitudinal groove, and the oil return hole flows back to the oil passage. There is no oil pressure process, so the oil supply amount is equal to zero. Therefore, when the plunger rotates, adjust the oil supply amount by changing the end point of the oil supply amount, This method is called oil supply end point adjustment method.


The reason why the automobile gasoline pump does not discharge oil is that the oil pump does not discharge oil due to the failure of the automobile gasoline filter.


The solution is: go to the 4S shop or maintenance shop of the car in time to replace the gasoline filter of the car, which can solve the problem that the oil pump does not discharge oil. If it has not been solved, it is recommended to overhaul the gasoline pump of the car.


It is recommended that the car should be refueled in time. It is not necessary to wait until the fuel volume warning light is on. Please choose a regular large gas station to refuel. Such oil products are guaranteed. In addition, do not power on for a long time without starting the engine, because this habit will not only affect the gasoline pump, but also affect other parts.


The company specializes in the production of various truck accessories, mainly including cab lifting oil pump, cab lifting oil cylinder, forklift tilt oil cylinder and steering oil cylinder. At present, the company is dominated by European truck accessories, such as Vlvo Volvo truck, Benz Benz truck, Scania skenia truck, man man truck, Renault Truck, Iveco truck, DAF Duff truck, etc http://www.hualongjx.cn/ 。


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