CN2050094U

CN2050094U - End face port plate for axial plunger pump or motor

Info

Publication number: CN2050094U
Application number: CN 89204831
Authority: CN
Inventors: 赵大庆; 周士瑜
Original assignee: Beijing Graduate School Of China University Of Mining And Technology
Current assignee: Beijing Graduate School Of China University Of Mining And Technology
Priority date: 1989-04-25
Filing date: 1989-04-25
Publication date: 1989-12-27

Abstract

The utility model relates to an end face port plate for an axial plunger pump or a motor, which is characterized in that the pressure feedback supported holes with a certain quantities and dimensions are arranged on a certain position of a port plate sealing band; the original triangular compensating groove is changed to a circular compensating groove. As a result, the force system equilibrium and the inclined direction of a cylinder body are regulated and the overturning moment of the end face port for axial plunger pump or motor cylinder body is reduced. As a result, the friction abrasion, the adhesion abrasion and the port plate are reduced to the lowest; the friction abrasion and the adhesion abrasion are produced by the direct contact between the periphery of the cylinder body; the burning phenomenon is eliminated; the internal leakage of the pump or the motor is decreased; the anti pollution-abrasion performance and the service life are enhanced. The utility model has the advantages of good process and low cost, which is suitable for all the end face port axial plunger pumps or motors.

Description

End face port plate for axial plunger pump or motor

The utility model relates to a kind of valve plate distribution dish that has two symmetrical kidney slots on it, and it can be used for the axial piston pump or the motor of all valve plate distribution formulas.

The flow auxiliary structure that existing end fluid-distributing axial plunger pump or motor are all, can be divided into two big classes, one class is not to be with any aiding support face and supported hole, another kind ofly has aiding support face or supported hole, and supported hole all is arranged on the flow pair on the aiding support face.The flow pair of any structure no matter, from theory analysis, experiment and the actual effect of using, all have following common defective: 1, the minimum clearance of cylinder body and thrust plate is zero, the circle edge of cylinder body end face directly contacts with thrust plate, thereby on the flow pair, form fretting wear, adhesive wear and burn have reduced the mechanical efficiency of such pump or motor; 2, the symmetrical center line of the position deviation waist shape oil-discharging cavity of the secondary minimum clearance of flow, thus the internal leakage that has increased such pump or motor causes temperature rise and heating; 3, abominable because of the clearance conditions and the working condition at oil-discharging cavity two ends, the antipollution polishing machine of such pump or motor is reduced, shortened the working life of pump or motor; 4, the thrust plate of existing band aiding support face and supported hole and corresponding housing structure complexity, processing difficulties, and cost height.

The purpose of this utility model is to avoid above-mentioned deficiency of the prior art, under the situation that housing structure is constant in keeping former flow pair, a kind of high antifouling property that has is provided, can eliminate burning dish phenomenon, and it is simple in structure, be easy to realize, the while is applicable to the thrust plate of all end fluid-distributing axial plunger pumps or motor.

The purpose of this utility model can realize by following measure: what the certain position on the sealing strip of the thrust plate oil-discharging cavity kidney slot outside was provided with some and a certain size forces the pressure feedback supported hole, regulate the force system in equilibrium and the well azimuth of cylinder body, reduce the tilting moment of end fluid-distributing axial plunger pump cylinder body.Simultaneously, change existing triangle compensating groove into garden shape compensating groove, to improve its antifouling property.

The utility model compared with prior art has following advantage:

1, can make because of cylinder body and thrust plate directly contact the fretting wear and the adhesive wear that produce and be reduced to minimum, eliminate the generation of burning dish, thereby reduce the input power of such pump or motor, improve mechanic effect, save energy;

2, make the position of the minimum clearance of cylinder body and thrust plate be in the symmetrical position of waist shape oil-discharging cavity, thereby reduced the internal leakage of oil hydraulic pump or motor, reduced the rapid temperature rise that produces because of internal leakage;

3, improved the clearance conditions at waist shape oil-discharging cavity two ends, the antipollution polishing machine and the working life of having improved oil hydraulic pump or motor.In addition, the utility model also has rational in infrastructure, simple, good manufacturability, and cost is low, is easy to advantages such as realization, and the cylinder body end face in the former flow pair need not done any secondary process and can realize above-mentioned effect.

Accompanying drawing 1 is the plan view of described thrust plate.

Accompanying drawing 2 be in the accompanying drawing 1 A-A to sectional view

Accompanying drawing 3 be in the accompanying drawing 1 B-B to sectional view

Below in conjunction with accompanying drawing the utility model is further described: the structural parameter of this valve plate distribution dish as described in Figure 1, the width (a=R of thrust plate external sealed band ₃-R ₁) value should be less than 7mm; Force the pressure feedback supported hole just to be arranged on the oil-discharging cavity side external sealed band, its distribution is that the symmetrical position with the oil-discharging cavity kidney slot is a center line along in the circumferential α ± 7 °～25 °; The quantity n of supported hole can be 2～4, the diameter D of supported hole ₂=(0.375～0.5) a; The distance R at supported hole centre distance thrust plate center ₂Can be at (R ₁+ R ₃)/2 are to ［ R ₃-(D ₂+ 1) value/2 ］.Change the triangle compensating groove of common used thrust plate into circular compensating groove, see Fig. 2, the optimum diameter D of circular compensating groove ₁=2mm, the degree of depth is 1mm, what Fig. 3 represented is the structure that above-mentioned supported hole communicates with the oil extraction kidney slot.

Claims

1, a kind of thrust plate that is used for end fluid-distributing axial plunger pump or motor has two symmetrical kidney slots on the thrust plate, it is characterized in that, in the oil extraction kidney slot outside of thrust plate several is set along the circumferential direction and forces the pressure feedback supported hole.

2, thrust plate as claimed in claim 1 is characterized in that, the width (a=R of thrust plate external sealed band ₃-R ₁) value should be less than 7mm.

3, thrust plate as claimed in claim 1 is characterized in that:

(1) position of forcing the pressure feedback supported hole is on oil-discharging cavity side external sealed band, and its distribution is that the symmetrical position with the oil-discharging cavity kidney slot is a center line along in the circumferential α ± 7 °～25 °, the distance R at the centre distance thrust plate center in hole ₂Can be at (R ₁+ R ₃)/2 are to ［ R ₃-(D ₂+ 1) value/2 ］;

(2) force the quantity of pressure feedback supported hole to can be 2～4;

(3) force the diameter D of pressure feedback supported hole ₂=(0.375～0.5) a;

4, thrust plate as claimed in claim 1 is characterized in that, two symmetrical kidney slot two ends have circular compensating groove.

5, thrust plate as claimed in claim 4 is characterized in that, the diameter D of described circular compensating groove ₁Be 2mm, the degree of depth is 1mm.