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not overflowing oil pump body, and some atmosphere: oil filling should exhaust the pump.

5) Mifengbuyan, have entered the atmosphere: Tighten related fittings.

6) wear between the piston and the cylinder bore or oil pan and the cylinder: should be converted to the touch, good touch.

7) hydraulic pump leak serious, constituting volume low power: proper correction of the hydraulic pump.

8) Return the plunger inadequate or can not return, causing the match between the cylinder block and oil pan is sealed: Department of center stretched spring cracking actions should be checked and converted center stretched spring.

9) variable organizational failures, not just the task of pleading: adjustment should be checked and corrected the error.

10) the oil pump inappropriate or inhale, sucking hard leak or within components: the temperature rise in accordance with the actual environment, select the appropriate fluid, adjacent to the fastening can leak.

11) The motor speed inadequate: to find out why, stop adjustment.

12) the oil viscosity is too large: real-time conversion proper viscosity oil.

With Common Rail fuel injection system as the representative of electronically controlled fuel injection technology can be implemented in any speed conditions of the high-pressure fuel injection, which is to improve the low engine speed, low-load conditions are particularly favorable performance. Since the maximum allowable is determined by the stiffness and tightness main components with high pressure pump injection pressure, thus greatly improve the high-pressure fuel injection pressure will encounter the problem of declining oil pump reliability, particularly oil pump plunger excessive leakage is difficult to establish higher fuel pressure problems arising. Several key technical issues for the common rail fuel system high-pressure pump design, conducted theoretical analysis, discusses how to solve the pump plunger excess leakage problems. In the relevant literature drew extensively on the basis of the composition of the high-pressure common rail fuel system, working principle, current research were reviewed, comprehensive analysis of the working characteristics of high pressure common rail fuel system, as well as improved fuel injection pressure, effective Pump control key technical problems faced by the amount of fuel leakage. In the main components of the high-pressure plunger pump, pump oil cams more detailed discussions on the basis, based on existing domestic mechanical processing equipment and process conditions, the supply pressure of the high-pressure oil 150MPa.

Analysis of the structure of the axial piston pump

Globular head plunger mounted within the shoe, the cylinder as a supporting spring pushes through ball return plate, return plate and piston shoe rotates together. By means of pushing the plunger swash plate for axial movement; return when relying on the suction return plate, consisting of steel balls and the spring, is pressed against the sliding surface of the swash plate, the spring is generally referred to as return spring, so that the pump self- absorption capacity. And the swash plate contact portion has an oil chamber, it passes through the piston and the cylinder hole in the middle of the working chamber is connected to the pressure oil chamber Flemish whole contact surface between the