CN113700748B - Composite textured surface for radial slide bearing - Google Patents
Composite textured surface for radial slide bearing Download PDFInfo
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- CN113700748B CN113700748B CN202110816134.0A CN202110816134A CN113700748B CN 113700748 B CN113700748 B CN 113700748B CN 202110816134 A CN202110816134 A CN 202110816134A CN 113700748 B CN113700748 B CN 113700748B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
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- Sliding-Contact Bearings (AREA)
Abstract
The invention discloses a composite textured surface for a radial sliding bearing, which is arranged on the inner surface of a bearing bush. The composite texture is distributed at the inlet of the radial sliding bearing and consists of at least two textures with different shapes, the textures with different shapes are alternately arranged and distributed in a rectangular matrix, the whole width of the composite texture accounts for one third of the length of the bearing, the texture area density is 5% -15%, the texture depths are all 5-30 mu m, and the texture areas with different shapes are equal. The invention is beneficial to improving the tribological performance of the radial sliding bearing, generating more obvious hydrodynamic pressure effect relative to a smooth bearing surface and a bearing surface with a single shape, obtaining lower friction force and higher bearing capacity, effectively increasing the oil film thickness of a friction pair, reducing the possibility of oil film (metal direct contact) rupture and prolonging the service life of the radial sliding bearing.
Description
Technical Field
The invention relates to the technical field of mechanical auxiliary friction characteristics, in particular to a composite textured surface for a radial sliding bearing.
Background
The surface texturing technology is a technology for processing microstructures such as pits, grooves or bulges on the surface of the mechanical sliding texture by a physical or chemical method under the nanoscale or micron scale; as an effective friction supporting surface modification method, the technology is widely applied to the fields of bearings, seals, air cylinders and the like, and achieves good tribology improvement effect, thereby effectively improving the reliability of a mechanical system and prolonging the service life; in general engineering, through theoretical research and experimental trial and error, the area ratio is found to be 5% -15%, and the friction characteristic is better when the depth is 10-60 microns; conventional textures are typically mostly triangular, diamond-shaped, circular, rectangular, etc. The related invention patents are as follows: an elliptical textured composite surface (chinese application CN 201120458420.6); an internal combustion engine piston with a surface texture morphology (chinese patent No. cn201310231889. X); a gear with a surface texture tooth surface (chinese patent No. 201220566666. X); a bullet-shaped pit textured surface (Chinese patent No. ZL 201510430446.2).
However, the optimum shape and arrangement have not been agreed at present, and the texture such as single circle, triangle, diamond, etc. cannot achieve the optimum friction and wear performance, and have certain limitations. It is therefore desirable to design a microtexture that is fabricated over a limited area, has various advantages and achieves better friction and lubrication characteristics.
Disclosure of Invention
The invention aims to solve the defects of the prior art, and provides a composite textured surface for a radial sliding bearing, wherein the texture processing distribution of the radial sliding bearing is optimized based on a trial-and-error method, and the larger bearing capacity and the smaller friction coefficient are obtained under the same processing space.
In order to solve the technical problems, the invention adopts the following technical scheme: a composite textured surface for a radial sliding bearing is provided on the inner surface of a bearing shell. The composite texture is distributed at the inlet of the radial sliding bearing and consists of at least two textures with different shapes, the textures with different shapes are alternately arranged and distributed in a rectangular matrix, the whole width of the composite texture accounts for one third of the length of the bearing, the texture area density is 5% -15%, and the texture depth is 5-30 mu m.
Further, the composite texture is composed of textures of two shapes, namely a diamond shape and a crescent shape.
Further, the arrangement direction of the composite texture is parallel to the movement direction of the radial sliding bearing.
Further, the length ratio between the long axis and the short axis in the diamond-shaped texture is 3:2, and the long axis is parallel to the movement direction of the radial sliding bearing.
Further, the crescent texture is formed by intersecting two circles with equal radius in the same direction, the distance between two circle centers is two thirds of the radius of the circle, and the connecting line of two arc tops in the crescent texture is parallel to the moving direction of the radial sliding bearing.
Further, the diamond-shaped texture and the crescent-shaped texture are equal in area and depth.
Further, the composite texture has a texture area density of 10%.
Compared with the prior art, the invention has the following beneficial effects: the invention is beneficial to improving the tribological performance of the radial sliding bearing, generating more obvious hydrodynamic pressure effect relative to a smooth bearing surface and a bearing surface with a single shape, obtaining lower friction force and higher bearing capacity, effectively increasing the oil film thickness of a friction pair, reducing the possibility of oil film (metal direct contact) rupture and prolonging the service life of the radial sliding bearing.
Drawings
FIG. 1 is a schematic view of a diamond and crescent shaped composite texture machined array on a radial slide bearing surface in accordance with example 1 of the present invention;
FIG. 2 is a shape layout of diamond texture (a) and crescent texture (b);
FIG. 3 is a longitudinal cross-sectional profile view of the composite texture array of example 1 of the present invention;
FIG. 4 is a graph of calculated pressure profiles along an axial centerline of a differently shaped microtextured radial slide bearing;
FIG. 5 is a graph of calculated bearing capacity versus coefficient of friction for different shapes of microtextured radial slide bearings;
FIG. 6 is a graph of instantaneous coefficient of friction for different shape texture skiving discs;
fig. 7 is a shape design of a leaf-shaped texture.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
The micro-texture is obtained through reference and trial-and-error calculation, and when most of the micro-textures are independently arranged, the micro-texture has good friction and lubrication performance with the length of 400 nanometers-1000 micrometers and the depth of 5-30 micrometers, and the invention provides a composite texture so as to obtain larger bearing capacity and smaller friction coefficient.
In the case of example 1,
as shown in fig. 1, a composite textured surface for a radial sliding bearing is provided on the inner surface of the bearing shell, the composite texture being distributed at the entrance of the radial sliding bearing, from the point of maximum oil film thickness
The position starts to set the texture array to +.>
The position is terminated, the texture array is in a rectangular matrix, and the texture array is in a +.>
To->
The setting length between the two is one third of the circumferential length (2 pi R) of the bearing; the area density of the composite texture is 10%, the composite texture consists of two textures with different shapes, wherein the two shapes are respectively diamond-shaped and crescent-shaped, the diamond-shaped textures and the crescent-shaped textures are staggered in the axial direction (lambda), and the diamond-shaped textures and the crescent-shaped textures are +.>
Each row of the upper textures is in the same shape and is arranged parallel to the movement direction of the radial sliding bearing. In combination with the texture design diagram in fig. 2, the length ratio between the long axis and the short axis in the diamond texture (a) is 3:2, and when the diamond texture is arranged on the inner surface of the bearing bush, the long axis in the diamond texture is parallel to the movement direction of the radial sliding bearing; the crescent texture (b) is obtained by intersecting two circles with equal radius in the same direction (the same direction is that the two circles are positioned on the same side of an intersecting pattern), the distance between the centers of the two circles is two thirds of the radius of the circles, and when the crescent texture is arranged on the inner surface of the bearing bush, the arc vertex connecting line of two arc lines in the crescent texture is parallel to the moving direction of the radial sliding bearing; the areas of the diamond-shaped texture and the crescent-shaped texture are equal, the lengths of the long axes of the diamond-shaped texture and the crescent-shaped texture are 100-200 mu m, the depths of the diamond-shaped texture and the crescent-shaped texture are equal, and the set depths of the diamond-shaped texture and the crescent-shaped texture are 9 mu m, as shown in figure 3.
And (3) calculating a discretization pressure field by establishing a Reynolds continuity equation to obtain a pressure distribution diagram of the section of the axial central line in FIG. 4 and theoretical calculation results of the bearing capacity and the friction coefficient of the textures in different shapes in FIG. 5. As can be seen from FIG. 4, processing the micro-texture at the corresponding position increases the oil film pressure and promotes the oil film peak value, wherein the pressure peak value of the smooth bearing is 60494Pa, the pressure peak value of the diamond-shaped texture is 64282Pa when the diamond-shaped texture is singly arranged, the pressure peak value of the crescent-shaped texture is 63550Pa when the crescent-shaped texture is singly arranged, the pressure field peak value of the diamond-shaped and crescent-shaped composite texture bearing is 64603Pa, the pressure field peak value of the diamond-shaped and crescent-shaped composite texture bearing is maximum, the pressure field peak value of the diamond-shaped and crescent-shaped composite texture bearing is promoted by 0.50% compared with the diamond-shaped texture, the pressure peak value of the diamond-shaped and crescent-shaped composite texture bearing is promoted by 1.66% compared with the crescent-shaped texture, and the smooth bearing is promoted by 6.79%; the micro-texture is used for generating micro-pressure effect in the running process of the bearing, increasing the bearing capacity of the bearing, generating dynamic pressure effect with different textures, compounding the two textures, and generating stronger micro-pressure effect by mutually influencing the textures in the running process of the bearing, so that the bearing performance is improved greatly.
By means of fig. 5, the textured bearing is improved in bearing capacity relative to the smooth bearing and reduced in friction coefficient compared to textured bearings of different shapes. The bearing capacity of the smooth bearing is 4.4583N, the bearing capacity of the crescent texture bearing is improved by 0.98% compared with that of the smooth bearing, the bearing capacity of the diamond texture bearing is improved by 1.09%, and the bearing capacity of the diamond and crescent composite texture bearing is improved by 1.2%; by comparing the friction coefficient, the friction coefficient of the smooth bearing is 0.3192, the crescent texture bearing is reduced by 1.4% compared with the smooth bearing, the diamond texture bearing is reduced by 1.44% compared with the smooth bearing, and the diamond and crescent composite texture bearing is reduced by 1.5% compared with the smooth bearing; the diamond and crescent composite texture bearing has larger bearing capacity, smaller friction coefficient and more excellent performance.
The micro-texture array shown in fig. 1 is processed on a disc, a test piece is placed on an MWF-1 type testing machine for friction and wear experiments, wherein the upper test piece and the lower test piece are both 45# steel, the micro-texture is processed on a lower test piece with the diameter of 66mm (processing mode: laser marking, RL-FP30 type optical fiber laser marking machine, qingdao Rayleigh laser Co., ltd.) with the load of 40N, the viscosity grade of lubricating oil ISO 5#, and the kinematic viscosity: 5.5mm 2 The reciprocating frequency is 4Hz, the experimental time is 40min, the instantaneous friction coefficient graph shown in figure 6 is obtained, and the result shows that the friction coefficient can be effectively reduced by processing the micro-texture on the surface of the friction pair, the friction coefficient of the diamond-shaped and crescent-shaped composite texture is minimum,the antifriction lubricating effect is most obvious.
In the case of example 2,
the composite textured surface for the radial sliding bearing adopts diamond-shaped and crescent-shaped textures to be alternately arranged, the arrangement positions, the array arrangement and the shape and the size are the same as those of the scheme in the embodiment 1, the arrangement depth of the diamond-shaped textures and the crescent-shaped textures is changed, and the arrangement depth is 12 mu m. At this time, the bearing capacity of the diamond-shaped and crescent-shaped composite texture bearing is 4.5097N, the friction coefficient is 0.3146, and compared with the bearing capacity of a smooth bearing, the bearing capacity of the diamond-shaped and crescent-shaped composite texture bearing is improved by 1.15%, and the friction coefficient is reduced by 1.44%.
In the case of example 3,
a composite textured surface for a radial sliding bearing is provided on the inner surface of the bearing shell, the composite texture being distributed at the entrance of the radial sliding bearing, from the maximum oil film thickness
The position starts to set the texture array to +.>
The position is terminated, the texture array is in a rectangular matrix, and the texture array is in a +.>
To->
The setting length between the two is one third of the circumferential length (2 pi R) of the bearing; the area density of the composite texture is 10%, the composite texture consists of two textures with different shapes, namely a diamond shape and a tree leaf shape, the diamond texture and the tree leaf shape texture are staggered in the axial direction (lambda), and the diamond texture and the tree leaf shape texture are +.>
Each row of the upper textures is in the same shape and is arranged parallel to the movement direction of the radial sliding bearing. The length ratio between the long axis and the short axis in the diamond texture is 3:2, and when the diamond texture is arranged on the inner surface of the bearing bush, the diamond texture is formed by the diamondThe middle long axis of the shape texture is parallel to the movement direction of the radial sliding bearing; as shown in fig. 7, the leaf-shaped texture is obtained by back-intersecting two circles with equal radius (the back-intersecting is that the centers of the two circles are positioned at two sides of the intersecting pattern), the distance between the centers of the two circles is seven eighth of the diameter of the circle, and when the leaf-shaped texture is arranged on the inner surface of the bearing bush, the middle long axis of the leaf-shaped texture (namely, the connecting line of two intersecting points of two sections of arcs) is parallel to the moving direction of the radial sliding bearing; the areas of the diamond-shaped texture and the leaf-shaped texture are equal, the lengths of the long axes of the diamond-shaped texture and the leaf-shaped texture are 100-200 mu m, the depths of the diamond-shaped texture and the leaf-shaped texture are equal, and the set depths of the diamond-shaped texture and the leaf-shaped texture are 9 mu m.
Other relevant settings are the same as in embodiment 1.
In the case of example 4,
the composite texture of the composite texture surface for the radial sliding bearing adopts alternate arrangement of diamond, crescent and triangle textures, the triangle textures are equilateral triangles, the areas of the triangle textures are equal to those of the diamond textures and the crescent textures, one central line of the triangle textures is parallel to the moving direction of the radial sliding bearing, the vertex of the triangle positioned on the central line points to the moving direction of the sliding bearing, and the rest setting parameters are the same as those of the embodiment 1.
Finally, it should be noted that the foregoing description of the embodiments is only for illustrating the technical solution of the present invention, and is not intended to limit the present invention, but is not limited to the foregoing examples, and the present invention is also intended to be limited to the modifications, adaptations, additions or substitutions made by those skilled in the art within the spirit and scope of the present invention.
Claims (7)
1. A composite textured surface for a radial slide bearing disposed on an inner surface of a bearing shell, characterized by: the composite texture is distributed at the inlet of the radial sliding bearing and consists of at least two textures with different shapes, the textures with different shapes are alternately arranged and distributed in a rectangular matrix, the whole width of the composite texture occupies one third of the circumferential length of the bearing, and the thickness of an oil film is the largest
The position starts to set the texture array to +.>
Terminating the position, wherein the area density of the texture is 5% -15%, and the depth of the texture is 5-30 mu m; the obvious hydrodynamic effect is generated, and the thickness of an oil film of the friction pair can be increased.
2. A composite textured surface for a radial slide bearing according to claim 1, characterized in that: the composite texture consists of textures of two shapes, namely a diamond shape and a crescent shape.
3. A composite textured surface for a radial slide bearing according to claim 1, characterized in that: the arrangement direction of the composite texture is parallel to the movement direction of the radial sliding bearing.
4. A composite textured surface for radial slide bearings according to claim 2, characterized in that: the length ratio between the long axis and the short axis in the diamond texture is 3:2, and the long axis is parallel to the movement direction of the radial sliding bearing.
5. A composite textured surface for radial slide bearings according to claim 2, characterized in that: the crescent texture is formed by intersecting two circles with equal radius in the same direction, the distance between two circle centers is two thirds of the radius of the circle, and the connecting line of two arc tops in the crescent texture is parallel to the movement direction of the radial sliding bearing.
6. A composite textured surface for radial slide bearings according to claim 2, characterized in that: the diamond texture and the crescent texture are equal in area and depth.
7. A composite textured surface for a radial slide bearing according to claim 1, characterized in that: the texture area density of the composite texture is 10%.
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| CN202110816134.0A CN113700748B (en) | 2021-07-20 | 2021-07-20 | Composite textured surface for radial slide bearing |
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| CN208236901U (en) * | 2018-01-02 | 2018-12-14 | 昆明理工大学 | A kind of textured gas bush(ing) bearing of journal surface |
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| CN110145466B (en) * | 2019-05-15 | 2020-09-29 | 珠海格力节能环保制冷技术研究中心有限公司 | Surface lubrication texture, compressor part, compressor and air conditioner |
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