CN111237151A - Axial plunger pump sliding shoe with surface texture - Google Patents

Abstract

The invention relates to an axial plunger pump sliding shoe with a surface texture, which comprises a sliding shoe body, wherein the sliding shoe body is provided with an upper end surface and a lower end surface which are opposite, the upper end surface is provided with a sliding shoe ball socket, the lower end surface is provided with an oil chamber, the oil chamber is positioned in the center of the lower end surface, the ball socket is communicated with the oil chamber through an oil through hole, a sealing strip is arranged between the oil chamber and the outermost ring of the lower end surface of the sliding shoe body, the lower end surface of the sliding shoe body is provided with an annular groove texture, and the annular groove texture is arranged from the middle of the sealing strip to two sides. According to the invention, the annular groove texture is processed on the bottom surface of the sliding shoe, so that the oil film bearing capacity at the sliding shoe friction pair can be improved, the viscous friction force and the friction torque are reduced, the mechanical loss is reduced, the dynamic pressure lubrication effect is enhanced, and the method has important significance for reducing the abrasion and prolonging the service life of the sliding shoe friction pair.

Description

Axial Piston Pump Slipper with Surface Texture

technical field

The invention relates to the field of engineering hydraulic machinery, in particular to a component of an axial plunger pump, in particular to an axial plunger pump sliding shoe with surface texture.

Background technique

Due to the advantages of high working pressure, easy variable adjustment, large speed range and high efficiency, axial piston pumps have been widely used in the shipbuilding industry, aerospace, machine tool industry, energy industry machinery and light textile machinery and other fields. The plug pump is developing in the direction of high pressure, high speed and large flow, and the problem of reducing friction and prolonging the life of the pump is very urgent.

The sliding shoe friction pair composed of the sliding shoe and the swash plate is one of the three friction pairs of the axial piston pump. During the working process, the movement form of the sliding shoe includes the axial movement of the plunger and the circumferential movement close to the surface of the swash plate. Under the action of the overturning moment, the sliding shoe is inclined and the swash plate forms a wedge-shaped oil film. Its bearing capacity consists of two parts. One is that the high-pressure oil generates a static pressure support force, and the other is that a hydrodynamic pressure field is also generated during the movement of the sliding shoe. For such a wedge-shaped flow field, the characteristics of the oil film produced by the hydrodynamic and static pressure hybrid bearing are relatively complex, which can easily cause friction and wear of the sliding shoe.

The moving speed of the sliding shoe is high and it is frequently subjected to periodic pressure shocks and the contact specific pressure is large, so that the friction pair of the sliding shoe is prone to lubrication failure, serious wear, and even the burning of the sliding shoe. In addition, due to the harsh working environment of the high-pressure plunger pump, which has been in high-speed, high-pressure, high-temperature and other working conditions for a long time, the lubrication state of the friction pair of the sliding shoe becomes very bad. For example, the overturning motion of the sliding shoe will affect the oil film of the friction pair of the sliding shoe. The stability of the load bearing causes the wear and failure of the sliding shoes; the relative movement speed between the sliding shoes and the swash plate is large, which is easy to generate a large amount of frictional heat, which increases the power loss of the pump, increases the temperature of the oil film, and reduces the viscosity of the oil film, resulting in the friction pair of the sliding shoes. Lubrication performance decreased. Therefore, it is of great significance to improve the dynamic pressure lubrication performance of the sliding shoe friction pair.

Experts at home and abroad have conducted long-term research on the inherent problems of axial piston pumps, and most of the research focuses on seeking anti-wear and self-lubricating materials. Judging from the current research and engineering practice, the research on materials has been relatively complete, and breakthrough progress cannot be achieved in a short period of time. Therefore, a reasonable structural design must be adopted to improve the working performance of the sliding shoe friction pair.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the tribological problem existing in the friction pair of the slipper to a certain extent. Therefore, the present invention proposes an axial piston pump with annular groove texture, which has the advantages of good dynamic pressure lubrication effect, small mechanical loss and high volumetric efficiency under high-speed and heavy-load conditions in an oil-lubricated environment. Slipper friction pair. Based on the hydrostatic bearing design method, the invention processes the lower end surface of the friction pair of the sliding shoe of the axial piston pump into a surface with an annular groove texture.

The present invention is achieved through the following technical solutions:

An axial piston pump sliding shoe with surface texture includes a sliding shoe body, the sliding shoe body has opposite upper and lower end surfaces, the upper end surface has a sliding shoe ball socket, and the lower end surface has a sliding shoe ball socket. Oil chamber, the oil chamber is located in the center of the lower end face, the ball socket and the oil chamber are communicated through an oil hole; the oil chamber and the outermost ring of the lower end face of the sliding shoe body are sealed There is an annular groove texture on the lower end surface of the sliding shoe body, and the annular groove texture is opened from the middle of the sealing belt to both sides.

As a preferred technical solution of the present invention, the width w of the annular groove texture is between 1.0 and 2.0 mm, and the depth h is between 10 and 30 μm.

Compared with the prior art, the present invention has the following advantages:

According to the hydrostatic bearing design method, the invention designs the lower end surface of the sliding shoe as a textured surface with an annular groove, and the annular groove texture and the sealing band form a stepped plane. From the knowledge of fluid mechanics, the stepped plane and other shapes of planes In comparison, the dynamic pressure generated by it is stronger; under the action of the step effect, it can better ensure the anti-overturning moment generated by the oil film pressure field, and enhance the working reliability of the sliding shoe. Compared with the slipper without annular groove texture, when the shoe posture is the same, due to the increased clearance liquid resistance due to the annular groove texture, the radial flow of the bottom oil chamber along the sealing belt decreases, and the pressure of the oil chamber is obtained to a certain extent. Improve, that is, the hydrostatic support force increases, the sliding shoe with annular groove texture can well meet the design requirements of dynamic pressure lubrication of the sliding shoe.

The invention does not add parts, only improves the dynamic pressure lubrication performance of the friction pair of the sliding shoe through the structural design, and has the advantages of simple structure and good economy. In addition, the structure has the characteristics of wide applicability, and can choose annular grooves of different sizes according to different working conditions, so as to ensure that the sliding shoe has excellent working performance.

Description of drawings

1 is a cross-sectional view of the present invention;

Fig. 2 is the bottom view of Fig. 1;

Figure 3 is an assembly view of the present invention.

In the figure: 1-slipper body; 2-slipper ball socket; 3-oil chamber; 4-oil hole; 5-annular groove texture; 6-seal belt; 7-plunger; 8-swash plate; 9-Cylinder bore; 10-Plunger ball head.

Detailed ways

The present invention is described in more detail below in conjunction with the accompanying drawings:

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are only used to explain the present invention, but not to limit the present invention.

This example provides an axial piston pump sliding shoe with surface texture, including a sliding shoe body 1, the sliding shoe body 1 has opposite upper and lower end surfaces, and the upper end surface has a sliding shoe ball socket 2. There is an oil chamber 3 on the lower end surface. The oil chamber 3 is located in the center of the lower end surface. The ball socket 2 and the oil chamber 3 are communicated with each other through an oil hole 4. Between the outermost ring of the lower end surface of the sliding shoe body is a sealing band 6, and an annular groove texture 5 is provided on the lower end surface of the sliding shoe body, and the annular groove texture 5 is formed by the sealing band 6. Open in the middle to both sides.

The axial piston pump slipper with groove structure is characterized in that: the width w of the annular groove 5 is between 1.0 and 2.0 mm, and the depth h is between 10 and 30 μm.

FIG. 3 is an assembly state diagram of the present invention. During the use of the slipper, the plunger ball head 10 is assembled with the slipper body ball socket 2, the plunger 7 is installed in the cylinder hole 9, and the slipper body is installed on the swash plate 8. During the operation, the plunger The high pressure oil force received is transmitted to the swash plate through the sliding shoe, and the plunger 7 reciprocates in the cylinder hole 9 under the reaction force of the swash plate 8 to the sliding shoe body 1 . Because the lower end face of the slipper is processed with an annular groove texture, the bearing capacity of the oil film can be improved, the viscous friction force and friction torque can be reduced, the mechanical loss can be reduced, and the dynamic pressure lubrication effect can be enhanced.

By processing an annular groove texture on the bottom surface of the sliding shoe, the invention can improve the bearing capacity of the oil film at the friction pair of the sliding shoe, reduce the viscous friction force and friction torque, reduce the mechanical loss, and enhance the dynamic pressure lubrication effect. The wear reduction and life extension of the friction pair is of great significance.

The above descriptions are only good examples of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. Inside.

Claims (2)

1. An axial piston pump sliding shoe with surface texture, including a sliding shoe body (1), the sliding shoe body (1) has opposite upper and lower end surfaces, and the upper end surface has a sliding shoe The ball socket (2) has an oil chamber (3) on the lower end surface, the oil chamber (3) is located in the center of the lower end surface, and the ball socket (2) and the oil chamber (3) pass through an oil connection The hole (4) is communicated, and a sealing band (6) is formed between the oil chamber (3) and the outermost ring of the lower end face of the sliding shoe body, and is characterized in that: An annular groove texture (5) is provided on the lower end surface of the sliding shoe body; The annular groove texture (5) is opened from the middle of the sealing band (6) to both sides. 2. The axial piston pump slipper with surface texture according to claim 1, characterized in that: the width w of the annular groove texture (5) is between 1.0 and 2.0 mm, and the depth h is between 1.0 and 2.0 mm. Between 10 and 30 μm.

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