CN111520248A

CN111520248A - Bionic distributed cylinder sleeve surface texture structure

Info

Publication number: CN111520248A
Application number: CN202010378851.5A
Authority: CN
Inventors: 马旋; 孟祥旭; 卢熙群; 李彤阳; 焦博文; 孙文; 王永强
Original assignee: Harbin Engineering University
Current assignee: Harbin Engineering University
Priority date: 2020-05-07
Filing date: 2020-05-07
Publication date: 2020-08-11

Abstract

The invention relates to a bionic distribution cylinder liner surface texture structure which comprises a cylinder liner body, wherein grooves similar to pineapple surface pits in distribution are formed in the inner surface of the cylinder liner body, the grooves are identical in geometric shape, the outline is oval, the cross section is rectangular, the grooves are distributed along the axial direction of the cylinder liner body (1) according to a spiral line, the pitch of the spiral line is 1.0-4.0 mm, the occupancy rate of the grooves (2) on the inner surface of the cylinder liner body (1) is 10% -35%, the size of the grooves (2) in the piston movement direction is length B, the size perpendicular to the piston movement direction is width A, and B is larger than A. The invention does not increase parts, improves the lubricating performance of the cylinder sleeve friction pair only through structural design, and has the advantages of simple structure and good economical efficiency. In addition, this structure still has extensive applicability's characteristics, can choose for use the slot of different distributions and sizes to the operating mode of difference to guarantee that the cylinder jacket has excellent working property.

Description

Bionic distributed cylinder sleeve surface texture structure

Technical Field

The invention relates to a cylinder sleeve surface texture structure, in particular to a bionic distribution cylinder sleeve surface texture structure, and belongs to the field of engineering machinery.

Background

The internal combustion engine is the most widely applied power device in the fields of automobiles, ships, engineering machinery and the like. When the internal combustion engine runs, fuel is combusted in the cylinder to push the piston group to do reciprocating motion and drive the crankshaft to rotate to output power. The active cylinder sleeve-piston ring is one of the most important friction pairs of the internal combustion engine, the working condition of the active cylinder sleeve-piston ring directly affects the dynamic property, the economical efficiency, the reliability, the durability and the like of the internal combustion engine, and the friction loss accounts for about 6 percent of the total energy consumption of the internal combustion engine. The lubrication research is an important aspect of the research of a cylinder sleeve-piston ring friction pair, and is beneficial to reducing the friction power consumption and improving the comprehensive performance of the internal combustion engine.

The traditional tribology theory considers that the smoother the surface of the friction pair is, the better the performance is, but the surface roughness obtained by surface finishing techniques such as polishing and grinding the surface is always limited due to the influence of material properties and processing precision. Theoretical research and a large number of engineering practices show that the smoother the surface of the friction pair is, the better the surface is, and certain surface roughness or surface texture is beneficial to the formation of a lubricating oil film so as to reduce friction and wear. In recent years, the surface texture of a friction pair is widely regarded by scholars at home and abroad because the surface tribological performance can be effectively improved, wherein the design and processing of the surface texture and the tribological performance test and theoretical analysis of the texture surface become the hot problems of research. Therefore, the application of the surface texture to improve the lubricating property of the cylinder sleeve-piston ring friction pair of the internal combustion engine is an effective method for improving the running reliability and the economical efficiency of the internal combustion engine.

Disclosure of Invention

The invention aims to solve the tribological problem of a cylinder sleeve friction pair to a certain extent. Therefore, the invention provides the cylinder sleeve friction pair with the bionic distribution of the surface texture, which has the advantages of good lubricating effect, small mechanical loss and high volume efficiency under the working conditions of high speed and heavy load in an oil lubricating environment. The invention is based on the fluid dynamic pressure principle, and the groove texture is processed on the inner surface of the cylinder sleeve of the internal combustion engine.

The invention is realized by the following steps:

the utility model provides a bionical cylinder jacket surface texture structure who distributes, characterized by includes the cylinder jacket body, the slot that similar pineapple surface pit distributes is seted up to cylinder jacket body internal surface, the slot geometric shape is the same, and the outline is the ellipse, and the cross section is the rectangle.

The invention also includes such features:

the grooves are distributed along the axial direction of the cylinder sleeve body according to a spiral line, and the pitch of the spiral line is 1.0-4.0 mm;

the occupancy rate of the groove on the inner surface of the cylinder sleeve body is 10-35%;

the size of the groove along the motion direction of the piston is length B, the size vertical to the motion direction of the piston is width A, and B is larger than A;

the length B of the groove is between 2.0 and 5.0mm, the width A of the groove is between 1.0 and 3.0mm, and the depth of the groove is between 10 and 60 mu m.

The invention has the beneficial effects that:

a large number of organisms in nature, such as pineapples and bamboos in plants, lizards and snakes in mountainous and desert regions, shellfish and fishes in oceans and the like, generally have excellent functions of desorption, drag reduction and wear resistance, and the functions are related to the non-smooth surface shape of the body surface of the organisms. According to the bionic non-smooth effect, the inner surface of the cylinder sleeve is designed to be a surface with a pit distribution groove similar to the surface of a pineapple, and the dynamic pressure generated by a step plane is stronger than planes in other shapes according to the principle of fluid dynamic pressure lubrication; under the action of the step effect, the anti-overturning moment generated by an oil film pressure field can be better ensured, and the working reliability of the cylinder sleeve is enhanced. In addition, the grooves can store a part of lubricating oil, the oil film bearing capacity is increased, the viscous friction force and end leakage are reduced, and the density of the microprotrusions is reduced to a certain extent due to the existence of the surface texture, so that the contact friction force is reduced, the mechanical efficiency is improved, and the method has important significance for guiding the low-friction design of the cylinder sleeve friction pair.

The invention does not increase parts, improves the lubricating performance of the cylinder sleeve friction pair only through structural design, and has the advantages of simple structure and good economical efficiency. In addition, this structure still has extensive applicability's characteristics, can choose for use the slot of different distributions and sizes to the operating mode of difference to guarantee that the cylinder jacket has excellent working property.

Drawings

FIG. 1 is a partial top view of the present invention;

FIG. 2 is a left side sectional view of the present invention;

fig. 3 is a view of the assembled parts of the present invention.

In the figure: 1-a cylinder liner body; 2-a groove; 3-a piston ring; 4-a piston; 5-ring groove of piston ring.

Detailed Description

The present invention will be described in detail with reference to specific embodiments.

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are intended to be illustrative only and are not intended to be limiting.

The example provides a bionic distribution cylinder liner surface texture design, which comprises a cylinder liner body 1, wherein the inner surface of the cylinder liner 1 is provided with grooves distributed like pineapple surface pits, the geometric shapes of the grooves 2 are the same, the outlines of the grooves are elliptic, and the cross sections of the grooves are rectangular.

The grooves 2 are distributed along the axial direction of the cylinder sleeve 1 according to a spiral line, and the thread pitch of the spiral line is 1.0-4.0 mm.

The occupancy rate of the groove 2 on the inner surface of the cylinder sleeve 1 is 10-35%;

the size of the groove 2 along the piston motion direction is length B, the size perpendicular to the piston motion direction is width A, and B is larger than A.

The length B of the groove 2 is between 2.0 and 5.0mm, the width A of the groove is between 1.0 and 3.0mm, and the depth of the groove is between 10 and 60 mu m.

Fig. 3 is a view of an assembled partial state of the present invention. The cylinder sleeve body 1 forms a friction matching pair with the piston ring 3 in the using process, the piston ring 3 is installed in the piston ring groove 5, in the working process, the cylinder sleeve body 1 is fixed, the piston ring 3 and the piston 4 do reciprocating motion along the cylinder sleeve body 1 in the piston ring groove 5, and as the groove is machined in the inner surface of the cylinder sleeve body, the bearing capacity of an oil film can be improved, the mechanical loss is reduced, the leakage is reduced, and the lubricating state is improved.

The above description is only a preferred embodiment of the present invention and should not be taken as limiting the invention, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

In summary, the following steps: the invention relates to a bionic distribution cylinder liner surface texture design, which comprises a cylinder liner body, wherein the inner surface of the cylinder liner is provided with grooves distributed like pineapple surface pits, the grooves have the same geometric shape, the outline is elliptical, the cross section is rectangular, and the grooves are distributed along the axial direction of the cylinder liner according to a spiral line, because the surface texture appears near an upper stop point and a lower stop point, the lubricating performance of a cylinder liner friction pair can be reduced to a certain extent, and the occupancy rate of the grooves on the inner surface of the cylinder liner is 10-35%. The bionic grooves are formed in the inner surface of the cylinder sleeve, so that a part of lubricating oil can be stored, the oil film bearing capacity is increased, the viscous friction force and end leakage are reduced, the density of micro-protrusions is reduced to a certain extent due to the existence of the surface texture, the contact friction force is reduced, the mechanical efficiency is improved, and the bionic grooves have important significance in guiding the low-friction design of a cylinder sleeve friction pair.

Claims

1. The utility model provides a bionical cylinder jacket surface texture structure who distributes, characterized by includes cylinder jacket body (1), the slot that similar pineapple surface pit distributes is seted up to cylinder jacket body (1) internal surface, slot (2) geometric shape is the same, and the profile is oval, and the cross section is the rectangle.

2. The bionic distribution cylinder liner surface texture structure as claimed in claim 1, wherein the grooves (2) are distributed along the axial direction of the cylinder liner body (1) according to a spiral line, and the pitch of the spiral line is between 1.0 mm and 4.0 mm.

3. The cylinder liner surface texture structure with bionic distribution according to claim 1 or 2, characterized in that the occupancy of the grooves (2) on the inner surface of the cylinder liner body (1) is 10-35%.

4. The cylinder liner surface texture structure with bionic distribution according to claim 1 or 2, characterized in that the dimension of the groove (2) along the piston motion direction is length B, the dimension perpendicular to the piston motion direction is width A, and B is larger than A.

5. The cylinder liner surface texture structure with bionic distribution according to claim 3, characterized in that the dimension of the groove (2) along the piston motion direction is length B, the dimension perpendicular to the piston motion direction is width A, and B is larger than A.

6. The cylinder liner surface texture structure with bionic distribution according to claim 4, characterized in that the length B of the grooves (2) is between 2.0 mm and 5.0mm, the width A is between 1.0 mm and 3.0mm, and the depth is between 10 μm and 60 μm.

7. The cylinder liner surface texture structure with bionic distribution according to claim 5, characterized in that the length B of the grooves (2) is between 2.0 mm and 5.0mm, the width A is between 1.0 mm and 3.0mm, and the depth is between 10 μm and 60 μm.