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Plane friction pair assignment approach may be relatively high precision grinding on channels.

Cylinder and valve plate in front of grinding, you should measure the total thickness of the scale and the scale should be ground off, and then adjust compensation to the mat. Larger valve plate grinding amount, after grinding should re-treated to guarantee hardened layer hardness (Table 2).

Table 2 piston pump parts hardness specification

Referrals plunger rod hardware HS84

Referrals plunger rod ball hardness> HS90

Swash plate appearance referral hardness> HS90

Referrals valve plate hardness> HS90

After the cylinder block and valve plate correction, the choice of the following ways to view the status of cooperation in face of the leak that the flow in the disk with Vaseline oil, the drain channel blocked, painted with good oil flow channels on the flat plate or flat, and then placed on the cylinder valve plate, write diesel cylinder bore, an interval of oiling, ie an oiling hole, a hole is not oiling, surveys more than 4h, the plunger holes diesel no leak and collusion, and to clarify the cylinder valve plate grinding qualified.

4 Conclusion

Piston length of life using the number, and the usual maintenance of conservation, hydraulic oil quantity and quality of oil cleanliness and so on. Prevent oil particles in the form of piston friction pairs wear, but also an effective way to extend the number of piston life.

Replacement parts in the repair should be produced using original parts that sometimes more than other parts of the offer imitation expensive, but the quality and stability is better, if the purchase price of a cheap imitation parts, seems to be cost savings in the short term, But thus it brings out hidden dangers, but also may use form larger piston damage.

on

High pressure pump

Works description:

Kawasaki negative flow system for high-pressure pump displacement control dispense controlled and electronically controlled two states

Electronic Control Status:

Changes associated with the displacement control signal is hydraulic pump oil flow before,

After the oil pump oil flow and pilot and negative flow

the amount,

Wherein the front and rear pump oil flow directly controlled high pressure fuel pump,

Pilot oil after electro-proportional control valve throttling high-pressure pump,

We can call it

For the pilot secondary pressure. We'll pump control as an example to analyze the changes in displacement below.

First, we must clear a few concepts

1.

Source displacement control signal is:

Before pump oil flow,

After the pilot secondary pump oil flow and oil flow and negative flow,

Wherein the front pump

Oil flow control a piston,

After a piston pump oil flow control piston and the swash plate

(End of the control piston of the small end of the swash plate,

It is often

Open state, end state control of the big end is normally closed, end of the control line pressure piston), a negative flow control piston, pilot two

Two times the oil flow control piston

2.

Control elements are

① spool:

Is a three-way valve,

It is composed by the spool and sleeve,

Relative movement between the two can.

Spool

Piston and secondary piston moves from the left end of the spring with the spool valve body constitutes the right level balance.

By moving the swash plate piston sleeve

Control, with the movement of the swash plate piston is moved, its distance and direction of movement of the piston with the swash plate consistent.

?② two pistons:

In the electronic control state,

Pilot secondary oil flow control two separate piston,

Negative flow does not participate directly

control,

But collected by the negative pressure sensor pressure parameter,

To the computer,

As calculated by the computer controlled electric current proportional valve

A parameter to control the pilot secondary oil stream;

In the pilot state,

Pilot secondary oil stream is truncated changed electronically controlled hydraulic valves,

Does not participate

The secondary piston control,

By the negative flow on the secondary piston alone direct control.

Secondary working direction of the piston is pushing the slide

The leftward movement of the valve spool, constitute the balance comes from the spring return.