Technical analysis of high pressure rail - high pressure oil pump for diesel engine

Category:Principle of automobile engine - Date:2015-10-12

high pressure oil pump is the interface of high pressure circuit and low pressure circuit. Under all conditions, it is mainly responsible for supplying enough high pressure fuel to the whole service life of the vehicle. At the same time, the extra fuel supply and pressure required to make the engine start quickly are also guaranteed.

It is composed of 3 cylinders with 120 angles with each other. The 3 pump plungers are driven by the cam drive on the drive shaft; when the plunger moves downward, the oil suction stroke valve will open, allowing the low pressure fuel to enter the pump chamber; when the plunger reaches the bottom stop, the oil inlet valve will be closed and the fuel in the pump chamber will be After the upward movement of the plunger is pressurized, it is transported to the accumulator and waited for the injection.

the high pressure oil pump is installed on the same location as the traditional diesel distributor pump. It is driven by engine belt, belt pulley and toothed belt, and the maximum speed is less than 3000 rpm. High pressure pump is lubricated by low pressure oil way. The high pressure oil pump is equipped with an electromagnetic valve for pressure control. The fuel is installed with three radiation - shaped 120° the pump oil plunger is compressed, the high pressure pump turns one circle, three times the oil supply, the peak driving torque is low, and the oil pump drive system keeps the stable load. 16N· the torque of the M is probably the 1/9 that drives an equal distribution pump torque, which means that the common rail system has less load than the traditional jet system in the pump drive. The required power is proportional to the common rail pressure and pump speed (fuel supply).

3- to the high pressure oil pump plunger bore;

integrate fuel metering valve and control rail pressure.

Integrated gear pump;

Use fuel oil lubrication;

Maximum allowable rail pressure: 1600bar;

High pressure common rail technology of diesel engine high pressure oil pump

High pressure common rail technology of diesel engine high pressure oil pump

High pressure common rail technology of diesel engine high pressure oil pump

High pressure common rail technology of diesel engine high pressure oil pump

High pressure common rail technology of diesel engine high pressure oil pump

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