CN219549048U - Surface self-lubricating sliding shoe and sliding shoe pair - Google Patents

Abstract

The utility model provides a surface self-lubricating slipper, which relates to the field of hydraulic pump equipment and comprises a slipper body, wherein a central oil chamber is arranged at the bottom of the slipper body; the surface of the end, which is used for contacting with the swash plate, of the slipper body is provided with micro-textures which are uniformly distributed along the outer circumference of the central oil chamber and are positioned between the central oil chamber and the swash plate. According to the utility model, the micro-texture is arranged on the slipper body, so that oil enters the central oil chamber from the plunger cavity through the damping hole to be stored in the micro-texture, and the oil in the micro-texture enables the oil sealing belt on the bottom surface of the slipper body to form a lubricating oil film in a short time, thereby being beneficial to increasing the thickness of the lubricating oil film, improving the supporting force of the lubricating oil film, reducing the leakage quantity, improving the lubricating property of a slipper pair, reducing the friction and abrasion of the surface of a swash plate and the surface of the slipper, and prolonging the service lives of the slipper and the swash plate.

Description

Surface self-lubricating sliding shoe and sliding shoe pair

Technical Field

The utility model relates to the technical field of hydraulic pump equipment, in particular to a surface self-lubricating sliding shoe and a sliding shoe pair.

Background

The swashplate type axial plunger hydraulic pump is an important power element of a hydraulic transmission system, so that the swashplate type axial plunger hydraulic pump is called a heart of the hydraulic system and is widely applied to the fields of engineering machinery, aerospace, ship machinery, construction equipment and the like. The service life of the friction pair mainly depends on three pairs of key friction pairs, namely a sliding shoe pair, a plunger pair and a flow distribution pair. The sliding shoe pair is one of three key friction pairs of a swash plate type axial plunger hydraulic pump and consists of a sliding shoe and a swash plate. It is counted that most of the failure modes of the plunger pump are caused by the abrasion failure of the friction pair, wherein the abrasion failure of the sliding shoe pair is mainly caused, and the service life of the plunger pump is seriously influenced.

Particularly, along with the development progress of the dynamoelectric machine of the hydraulic pump, the plunger pump under the matching of the motor can realize continuous operation at a low rotation speed near zero, but the formation of a lubricating oil film is unfavorable at the low rotation speed, the abrasion of a friction pair is more severe, and meanwhile, the phenomenon of overturning of a sliding shoe in the working process is easy to cause the failure of the oil film and the eccentric wear of the sliding shoe. The oil film failure can cause the direct contact of skid shoes and swash plate, produce frictional wear, internal leakage increases to reduce axial plunger hydraulic pump's volumetric efficiency, can even produce phenomena such as "burn-in", "bootie", etc. when serious, seriously threaten the life of plunger pump and cause a large amount of economic loss.

The utility model discloses a surface self-lubricating slipper, which aims to improve the technical problems.

The utility model adopts the following scheme:

the surface self-lubricating sliding shoe comprises a sliding shoe body, wherein a central oil chamber for oil storage is arranged at the bottom of the sliding shoe body, a ball socket matched with a ball head of a plunger is arranged on the sliding shoe body, a damping hole is formed in one end, close to the bottom of the sliding shoe body, of the ball socket, and the damping hole is communicated with the ball socket and the central oil chamber; the surface of one end of the slipper body, which is used for being contacted with the swash plate, is provided with micro-textures, and the micro-textures are uniformly distributed along the outer circumferential direction of the central oil chamber and are positioned between the central oil chamber and the swash plate.

As a further improvement, the micro-texture is a micro-pit structure, and the shape of the bottom surface is round, rectangular or triangular.

As a further improvement, the micro-texture has a width ranging from 0.2 to 1mm and a depth ranging from 0.5 to 3mm.

As a further improvement, the micro-texture, the central oil chamber and the damping holes are concentrically distributed, the micro-texture accounts for 10% -50% of the bottom area of the sliding shoe body, and the bottom area of the micro-texture is about 0.2-1 square millimeter.

As a further improvement, the material of the sliding shoe body is stainless steel.

As a further refinement, the microtextured interior is configured to be entirely filled with self-lubricating material, not filled with self-lubricating material, or partially filled with self-lubricating material.

As a further improvement, the self-lubricating material is a graphene, molybdenum disulfide or polytetrafluoroethylene solid lubricating material, and the solid lubricating material is used for being uniformly mixed with the adhesive.

The shoe pair comprises a swash plate and the shoes with self-lubricating surfaces, wherein the swash plate is connected with the shoes with self-lubricating surfaces in a matched mode.

By adopting the technical scheme, the utility model can obtain the following technical effects:

according to the surface self-lubricating slipper disclosed by the utility model, the micro-texture is arranged on the surface of the slipper body, so that oil enters the central oil chamber from the plunger cavity through the damping hole to be stored in the micro-texture, and the oil in the micro-texture can enable the oil sealing belt on the bottom surface of the slipper body to form a lubricating oil film in a short time, so that the thickness of the oil film is increased, the supporting force of the oil film is improved, the leakage quantity is reduced, the lubricating property of a slipper pair is improved, the friction and abrasion between the surface of a swash plate and the surface of the slipper are reduced, and the service lives of the slipper and a swash plate are prolonged.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a slipper pair of the slipper of the present utility model mated with a swash plate;

FIG. 2 is a process flow diagram of the soft and hard combination of the present utility model with self-lubricating wear resistant technology;

FIG. 3 is a schematic view of the construction of a slipper according to a first embodiment of the utility model;

FIG. 4 is a schematic view of the surface of a slipper according to a first embodiment of the utility model;

FIG. 5 is a schematic view of a first embodiment of the present utility model having a micro-texture on the surface of the shoe that is fully filled with a self-lubricating material;

FIG. 6 is a schematic illustration of the micro-texture of the surface of a slipper of a first embodiment of the utility model, partially filled with a self-lubricating material.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.

Examples

The first embodiment of the utility model provides a surface self-lubricating sliding shoe, which comprises a sliding shoe body 1, wherein the bottom of the sliding shoe body is provided with a central oil chamber 5 for storing oil, a ball socket 3 used for being matched with a ball head of a plunger is arranged on the sliding shoe body 1, one end of the ball socket 3, which is close to the bottom of the sliding shoe body 1, is provided with a damping hole 4, the damping hole 4 is communicated with the ball socket 3 and the central oil chamber 5, and the damping hole 4 is used for injecting the oil in a plunger cavity into the central oil chamber 5 at the bottom of the sliding shoe body 1 to form a lubricating oil film, so that the lubricating mechanism of a traditional sliding shoe pair is realized.

Further, the surface of the end of the slipper body 1, which is used for contacting the swash plate 2, is provided with a micro-texture 6, and the micro-texture 6 is a micro-pit structure with a specific shape, size and special arrangement mode, which is processed on the surface of the friction pair according to the wish by a specific method of mechanical processing, chemistry or physics. The micro-texture 6 can change the surface morphology and contact angle of the friction pair so as to improve the contact state or the lubrication effect, and can change the surface wettability of the material, store abrasive particles, reduce the contact area and the like. And the micro-textures 6 are uniformly distributed along the outer circumference of the central oil chamber 5 and are positioned between the central oil chamber 5 and the swash plate 2. According to the utility model, the micro-texture 6 is arranged on the slipper body 1, so that oil enters the central oil chamber 5 from the plunger cavity through the damping hole 4 and is stored in the micro-texture 6, and the oil in the micro-texture 6 can enable the oil sealing belt on the bottom surface of the slipper body 1 to form a lubricating oil film in a short time, thereby being beneficial to increasing the thickness of the oil film, improving the supporting force of the oil film, reducing the leakage quantity, improving the lubricating property of slipper pairs, reducing the friction and abrasion of the surface of the swash plate 2 and the surface of the slipper, and prolonging the service lives of the slipper and the swash plate 2.

Further, the shape of the bottom surface of the micro-texture 6 may be circular, rectangular, triangular, etc., the width thereof is in the range of 0.2-1mm, the depth thereof is in the range of 0.5-3mm, and the depth thereof cannot be too small, so as to ensure that the self-lubricating material filled in the micro-texture 6 cannot directly fall off at the initial stage of running of the slipper, thereby preventing the self-lubricating material from possibly not playing a lubricating role and even exacerbating the problem of abrasion. The bottom surface of the micro-texture 6 is preferably circular, the diameter and the depth of the micro-texture are preferably 0.5mm and 1mm respectively, and the micro-texture 6 can be in different distribution forms and shapes according to different working conditions and requirements, so that the application range is wide.

Further, the micro-texture 6, the central oil chamber 5 and the damping holes 4 are concentrically distributed, preferably, the micro-texture 6 accounts for 10% -50% of the bottom area of the slipper body 1, and the bottom area is about 0.2-1 square millimeter.

Preferably, the material of the slipper body 1 is stainless steel, and the material of the slipper body 1 is stainless steel, so that the cost is lower due to the fact that common brass materials are replaced. The price of nonferrous metal brass is about 2-3 times of that of stainless steel material, and cheaper stainless steel material is selected to replace the nonferrous metal brass, so that the nonferrous metal brass has better economical efficiency if the nonferrous metal brass can be applied to the field of practical engineering. The stainless steel is used as the matrix of the sliding shoe body 1, so that the sliding shoe has better comprehensive performance, is particularly suitable for severe environment working conditions, can be applied to marine equipment, and can be severely corroded if conventional copper alloy materials such as brass are used. The stainless steel material is adopted, so that seawater corrosion can be effectively prevented, and the application range is wider.

Further, the inside of the micro-texture 6 may be selectively filled with the self-lubricating material entirely, without the self-lubricating material, or partially filled with the self-lubricating material. On one hand, the micro-texture 6 filled with the self-lubricating material and the sliding shoe body 1 form a soft and hard combined self-lubricating structure, so that abrasion of a sliding shoe pair is effectively reduced; on the other hand, the micro-texture 6 not filled with the self-lubricating material can be used for storing abrasive particles falling off in the wearing process of the sliding shoe pair, so as to prevent secondary wearing.

Preferably, the self-lubricating material is a solid lubricating material such as graphene, molybdenum disulfide or polytetrafluoroethylene, and the solid lubricating material is used for being uniformly mixed with the adhesive. The solid lubricating material and the adhesive are preferably graphene and epoxy resin adhesive respectively, and the content of the mixed graphene is 0.5% -1%. The micro-textures 6 filled with the self-lubricating material and the sliding shoe body 1 form a novel sliding shoe structure with self-lubricating wear-resisting property and soft and hard combination. The mechanism of the self-lubricating antifriction strategy with the combination of softness and hardness is as follows: the low-friction self-lubricating material (soft) and the material (hard) with good surface mechanical stability are respectively combined on different scales, so that the friction performance of the kinematic pair is improved.

The utility model relates to a preparation method of a surface self-lubricating slipper, which mainly comprises the following steps: firstly providing a slipper body 1, and secondly processing a micro-texture 6 with a specific shape, size and arrangement mode on the surface of one end of the slipper body 1 contacted with a swash plate 2 by utilizing a numerical control machine tool or a laser marking machine; and then covering graphene uniformly mixed with an epoxy resin adhesive on the surface of the sliding shoe body 1, discharging air in the micro-texture 6 by utilizing a vacuum pump, enabling the self-lubricating material to smoothly flow into the micro-texture 6, waiting for complete solidification, finally removing redundant self-lubricating material on the surface of the sliding shoe body 1, and carrying out surface polishing treatment by utilizing a metallographic polishing machine. Through the steps, the soft and hard combined sliding shoe with self-lubricating and wear-resisting performances can be obtained. The present utility model is illustrated by three cases where the inside of the micro-texture 6 is fully filled with self-lubricating material, not filled with self-lubricating material, or partially filled with self-lubricating material.

Embodiment one: the microtexture 6 is not filled with self-lubricating material:

this embodiment only processes the micro-texture 6 and does not fill the micro-texture 6 with self-lubricating material. The micro-texture 6 on the surface of the sliding shoe body 1 stores certain oil, in the working process of the plunger pump, the oil enters the central oil chamber 5 on the bottom surface of the sliding shoe from the plunger cavity through the damping hole 4, and the oil stored in the micro-texture 6 can enable the oil sealing belt on the bottom surface of the sliding shoe body 1 to form a lubricating oil film in a short time, so that the thickness of the oil film is increased, the supporting force of the oil film is improved, and the leakage quantity is reduced.

And secondly, the micro-texture 6 is fully filled with self-lubricating materials:

when the oil film thickness is too thin and nearly breaks or is not formed in a state of starting and stopping or running at a low speed, the embodiment fills solid lubricating materials in the micro-texture 6 completely, and the self-lubricating materials uniformly mixed with the adhesive are filled in the micro-texture 6 by utilizing a vacuum injection method, so that a novel wear-resistant sliding shoe structure with self-lubricating wear-resistant characteristics based on a soft-hard strategy, namely, taking stainless steel materials as a sliding shoe body 1 (hard) and combining the micro-texture 6 and the filled self-lubricating materials (soft), is formed. In this embodiment, in particular, in a poor lubrication or pure dry friction state of the sliding shoe pair, the solid lubricating material gradually falls off during the running process of the sliding shoe, which is helpful for lubrication of the sliding shoe pair.

And thirdly, the micro-texture 6 is partially filled with self-lubricating materials:

in the embodiment, the solid lubricating material is filled in only part of the micro-textures 6, and the rest part of the micro-textures 6 can be used for storing self-lubricating materials, namely abrasive particles, which fall off in the motion process of the friction pair, so that secondary abrasion of the surface of the slipper body caused by the impurities is prevented.

Of the above three embodiments, embodiment three is considered to have more excellent performance. Because the third embodiment not only has the self-lubricating effect, but also has better wear resistance. The above embodiments are only a part of embodiments of the present utility model, and are not limited thereto, and more embodiments can be obtained by arranging the micro-textures 6 on the bottom surface of the slipper body 1 in different shapes and different forms, and the best performance embodiments can be obtained by comprehensively comparing the performance characteristics of the embodiments.

In summary, the surface self-lubricating sliding shoe provided by the utility model solves some problems of the traditional sliding shoe mentioned in the background art, particularly improves the lubricating characteristic of the sliding shoe pair in a state of poor lubrication at a start-stop stage or at a low rotation speed and the like, reduces severe abrasion to the sliding shoe pair caused by mixed lubrication or even dry friction, and improves the wear resistance of the sliding shoe pair, thereby improving the working efficiency of a plunger pump and prolonging the service life.

A second embodiment of the present utility model provides a slipper pair, which includes a swash plate 2 and a slipper with self-lubricating surface as described above, where the swash plate 2 is connected with the slipper with self-lubricating surface in a matching manner. The shoes are pressed on the surface of the swash plate 2 under the external forces such as the central spring force, the oil pressure of the plunger cavity and the like, and perform approximate circular motion on the surface of the swash plate 2.

The above is only a preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above examples, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model.

Claims (8)

1. The surface self-lubricating sliding shoe is characterized by comprising a sliding shoe body, wherein the bottom of the sliding shoe body is provided with a central oil chamber for oil liquid storage, a ball socket matched with a ball head of a plunger is arranged on the sliding shoe body, one end of the ball socket, which is close to the bottom of the sliding shoe body, is provided with a damping hole, and the damping hole is communicated with the ball socket and the central oil chamber; the surface of one end of the slipper body, which is used for being contacted with the swash plate, is provided with micro-textures, and the micro-textures are uniformly distributed along the outer circumferential direction of the central oil chamber and are positioned between the central oil chamber and the swash plate.

2. The surface self-lubricating shoe of claim 1, wherein the micro-texture is a dimple structure having a bottom surface shape of a circle, rectangle or triangle.

3. The surface self-lubricating slipper according to claim 1, wherein the micro-texture has a width in the range of 0.2-1mm and a depth in the range of 0.5-3mm.

4. The surface self-lubricating slipper according to claim 1, wherein the micro-texture and the central oil chamber and the damping holes are concentrically distributed, the micro-texture accounts for 10% -50% of the bottom area of the slipper body, and the micro-texture bottom area is about 0.2-1 square millimeter.

5. The surface self-lubricating shoe according to claim 1, wherein the shoe body is made of stainless steel.

6. The surface self-lubricating slipper according to claim 1, wherein the microtextured interior is configured to be fully filled with self-lubricating material, not filled with self-lubricating material, or partially filled with self-lubricating material.

7. The surface self-lubricating shoe of claim 6, wherein the self-lubricating material is a graphene, molybdenum disulfide or polytetrafluoroethylene solid lubricating material for uniform mixing with an adhesive.

8. A slipper pair comprising a swash plate and a surface self-lubricating slipper as claimed in any one of claims 1 to 7, the swash plate being in mating connection with the surface self-lubricating slipper.