CN109139699B - Special-shaped inclined plane platform thrust sliding bearing with interface slippage at whole moving surface and inlet area static surface - Google Patents

Special-shaped inclined plane platform thrust sliding bearing with interface slippage at whole moving surface and inlet area static surface Download PDF

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CN109139699B
CN109139699B CN201811171465.8A CN201811171465A CN109139699B CN 109139699 B CN109139699 B CN 109139699B CN 201811171465 A CN201811171465 A CN 201811171465A CN 109139699 B CN109139699 B CN 109139699B
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bearing
lubricating oil
platform
film
inclined plane
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CN109139699A (en
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张永斌
夏依婷
张美华
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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
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • F16C32/0629—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion
    • F16C32/0633—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion the liquid being retained in a gap
    • 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
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
    • F16C17/08—Sliding-contact bearings for exclusively rotary movement for axial load only for supporting the end face of a shaft or other member, e.g. footstep bearings
    • 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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  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sliding-Contact Bearings (AREA)

Abstract

The invention relates to a special-shaped inclined plane platform thrust sliding bearing with interface slippage at the whole moving surface and the static surface of an entrance area, which comprises a fixed tile block (1) and a moving flat plate (4), wherein the working surface of the fixed tile block (1) comprises a platform surface (2) and an inclined plane (3), and the value range of the included angle theta between the platform surface (2) and the inclined plane (3) is as follows: 1.0X 10‑5°≤θ≤1.0×10‑3°The working surface of the moving flat plate (4) is parallel to the platform surface (2), a divergent wedge-shaped gap is formed between the fixed tile block (1) and the moving flat plate (4), and the moving direction of the moving flat plate (4) is from the small end of the wedge-shaped gap to the large end of the wedge-shaped gap; the gap between the two plates is filled with lubricating oil (5). The lubricating oil (5) slides on the platform surface (2) and the whole moving flat plate (4), but does not slide on the inclined surface (3). The bearing of the present invention has obvious antifriction and energy saving effect and is used as bearing part in mechanical equipment.

Description

Special-shaped inclined plane platform thrust sliding bearing with interface slippage at whole moving surface and inlet area static surface
Technical Field
The invention relates to the field of bearings, in particular to a thrust sliding bearing with a special-shaped inclined plane platform, wherein interface slippage occurs on the whole moving surface and the static surface of an inlet area.
Background
Bearings are important mechanical parts for supporting shaft parts. The sliding bearing and the rolling bearing are mainly divided into two types. The following main performance requirements are imposed on the bearing: bearing accuracy, bearing stiffness, low coefficient of friction and wear resistance. This requires that the bearing be a very delicate mechanical component and that it have a sufficient load-bearing capacity. In order to achieve good antifriction and wear resistance, the bearings also need to have good lubrication properties. The development of the bearing technology to date is mature, but the bearing technology is established on the basis of the traditional lubrication theory. At present, rolling bearings and sliding bearings are applied to different occasions and have advantages respectively. Since the present invention relates to sliding bearings, the types and techniques of existing sliding bearings are summarized as follows:
from the lubrication mechanism, the sliding bearing is classified into a hybrid friction sliding bearing and a fluid lubrication sliding bearing. The former relies on the boundary adsorption film and the hydrodynamic pressure effect to realize lubrication, and is used for low-speed, light-load and unimportant occasions; the latter relies on fluid films to achieve lubrication, which is used in important situations and more widely. The fluid lubrication sliding bearing is a main body of the sliding bearing and is divided into a fluid dynamic pressure lubrication sliding bearing and a fluid static pressure lubrication sliding bearing. The hydrostatic lubrication sliding bearing is supplied with oil by an external hydraulic system, supports load by oil pressure, is lubricated by hydraulic oil, has high manufacturing precision, complex structure and high cost, and is used for important occasions requiring high supporting rigidity, high supporting precision and high bearing capacity. The hydrodynamic lubrication sliding bearing realizes lubrication by means of hydrodynamic effect, has the advantages of simple structure, low cost and good performance, and is a common sliding bearing with wider application. It is divided into hydrodynamic lubrication centripetal sliding bearing and hydrodynamic lubrication thrust sliding bearing. The former is used to support radial loads and the latter is used to support axial loads. The type of the existing predominantly hydrodynamic lubrication thrust sliding bearing and its features are described below.
An inclined plane pad bearing, such as that shown in figure 1. It relies on the convergence gap formed between the upper and lower surfaces and the relative motion between these two surfaces to achieve the hydrodynamic effect, thereby achieving lubrication. The bearing has great bearing capacity and good antifriction and wear resistance.
Such bearings are classified into a fixed pad bearing in which both the upper and lower surfaces are not rotatable about a fulcrum, and a tilting pad bearing in which one surface is rotatable about a fulcrum. With good design, tilting pad bearings have a greater load carrying capacity than fixed pad bearings.
A sawtooth pad bearing, as shown in figure 2. The working and lubricating mechanism of the bearing is the same as that of the bearing. Its load capacity is much lower than the previous bearing under the same conditions.
And thirdly, a bevel platform pad bearing, which is shown in figure 3. The working and lubricating mechanisms of the bearing are the same as those of the bearing. Under the same working condition, the maximum bearing capacity of the bearing is 20% higher than that of the bearing with the inclined plane fixed pad.
And fourthly, a Rayleigh step bearing, wherein the bearing is shown in figure 4. The working and lubricating mechanism of the bearing is the same as that of the previous bearing. Compared with the three bearings, the bearing has the highest maximum bearing capacity under the same working condition, and is 28% higher than the maximum bearing capacity of the inclined plane fixed pad bearing.
According to the conventional fluid lubrication theory, the conventional bearings shown in fig. 1-4 all rely on a convergent wedge-shaped gap formed between two solid surfaces, and under the driving of a moving surface, lubricating oil is brought in from a large section of the convergent wedge-shaped gap and brought out from a small section of the convergent wedge-shaped gap, so that the lubricating oil is extruded in the convergent wedge-shaped gap to generate oil pressure, and a lubricating oil film has bearing capacity, thereby forming the fluid dynamic pressure lubrication bearing. According to the conventional fluid lubrication theory, it is impossible to form a hydrodynamic lubricating oil film in a divergent wedge-shaped gap formed between two solid surfaces, and then it is impossible to form a bearing. Because at this moment under the motion surface drive, lubricating oil is taken into from the little section of dispersing the wedge clearance, and is taken out from its big cross-section, lubricating oil just can not receive the extrusion in dispersing the wedge clearance like this, just can not produce the oil pressure yet, does not possess the bearing capacity, can not form the lubricating oil film.
Disclosure of Invention
The invention aims to provide a special-shaped inclined plane platform thrust sliding bearing with interface slippage on the whole moving surface and the static surface of an inlet area. Contrary to conventional fluid lubrication theory, such bearings form a divergent wedge gap between the two contacting surfaces. In contrast to the conventional ramp platform pad thrust sliding bearing shown in FIG. 3, the surface clearance of such a bearing is smaller in the inlet region than in the outlet region. According to conventional fluid lubrication theory, this bearing should be unpractical, since the oil is brought in from the small cross section of the diverging wedge-shaped gap and out from its large cross section, where it is not squeezed, and is not able to build up oil pressure, without bearing capacity. However, if the stationary contact surface of the bearing inlet area is an oil-repellent coated surface with weak physical adsorption capacity, so that the lubricating oil film slides on the stationary contact surface of the bearing inlet area, and the lubricating oil film also slides on the whole moving surface of the bearing, but the interfacial shear strength between the lubricating oil film and the moving surface in the bearing is greater than that between the lubricating oil film and the stationary surface of the inlet area, while the lubricating oil film does not slide on the rest surface of the bearing, i.e. the stationary surface of the outlet area of the bearing, and the flow rate of the lubricating oil flowing into the small section of the bearing inlet area is greater than that flowing out of the large section of the bearing outlet area due to the sliding of the lubricating oil film on the stationary surface and the whole moving surface of the bearing inlet area, so that the lubricating oil can be squeezed in such divergent wedge-shaped gaps to generate oil pressure, the lubricating film has a load-bearing capacity. This results in the present invention to refer to a profiled slope platform thrust sliding bearing with interface slippage at the whole moving surface and at the inlet area stationary surface.
The special-shaped inclined plane platform thrust sliding bearing with certain bearing capacity is realized by using an interface sliding technology under a divergent wedge-shaped gap which is avoided in the traditional bearing. The bearing has the advantages of easy manufacture, simple structure and low cost.
The technical solution of the invention is as follows:
the utility model provides a special-shaped inclined plane platform thrust sliding bearing that interface slided all appears in whole moving surface department and entrance static surface department, as figure 5, including a fixed tile (1), fixed tile (1) working surface includes platform face (2) and inclined plane (3), and the contained angle between inclined plane (3) of fixed tile (1) and platform face (2) of fixed tile (1) is theta, and the value range of theta is: 1.0X 10-5°≤θ≤1.0×10-3°The platform surface (2) is an oleophobic coating surface, and the inclined surface (3) is an oleophilic coating surface of the fixed tile block (1) or an oleophilic natural surface of the fixed tile block (1); and a moving plate (4) having a plane B (6), wherein the plane B (6) is a natural surface of the moving plate (4) or a coated surface of the moving plate (4). The moving plate (4) is matched with the fixed tile (1), and the plane B (6) of the moving plate (4) is parallel to the platform surface (2) of the fixed tile (1). A wedge-shaped gap is formed between the fixed pad (1) and the moving plate (4), the moving direction of the moving plate (4) relative to the fixed pad (1) is from the small end of the wedge-shaped gap to the large end of the wedge-shaped gap, the wedge-shaped gap is filled with lubricating oil (5), and the gap value at the small end of the wedge-shaped gap, namely the thickness of the lubricating oil (5) film at the bearing inlet area is hiThe gap value at the large end of the wedge gap, namely the thickness of the lubricating oil (5) film at the outlet of the bearing is hoThe dynamic viscosity of the lubricating oil (5) during operation is eta, the moving speed of the moving flat plate (4) relative to the fixed pad (1) is u, and the interface shear strength between the lubricating oil (5) and the plane B (6) is tausbThe shearing strength of the interface between the lubricating oil (5) and the flat table surface (2) is tausaThe width of the platform surface (2) and the width of the inclined surface (3) are respectively l2And l1Defining: lambda [ alpha ]τ＝τsb/τsa，
Figure BSA0000171636820000031
k＝tanθ，ψ＝l1/l2，α＝hi/(l1+l2)，Ho＝ho/hi(ii) a The invention requires that:
Figure BSA0000171636820000032
interface shear strength tau between lubricating oil (5) and inclined plane (3)scGreater than the shear stress at the bevel (3), i.e.: tau issc＞τsb/2-3qvη/hi 2Here, q isvIs the volume flow of the lubricating oil (5) per unit contact length per unit time through the bearing of the invention,
Figure BSA0000171636820000033
thus, the lubricating oil (5) film slips on the land surface (2) and the entire flat surface B (6), while the lubricating oil (5) film does not slip on the inclined surface (3). This results in the present invention directed to a profiled-surface platform thrust sliding bearing with interfacial slippage both across the moving surface and at the stationary surface of the inlet area.
Furthermore, the platform surface (2) of the fixed tile block (1) is a fluorocarbon coating surface, the inclined surface (3) of the fixed tile block (1) is a titanium dioxide coating surface, and the plane B (6) of the moving flat plate (4) is a natural surface of a steel part.
The invention has the beneficial effects that:
the invention designs a thrust sliding bearing of a special-shaped inclined plane platform by using an interface sliding technology and a surface coating method. The bearing is suitable for occasions where the surface clearance of the bearing inlet area is smaller than that of the bearing outlet area, which cannot be achieved by the traditional inclined plane platform thrust sliding bearing. The bearing has considerable bearing capacity, good lubricating oil film and lower friction coefficient value, can play a better role in antifriction, wear resistance and energy saving, and is used as a bearing part on mechanical equipment.
The invention has the following advantages:
(1) the bearing is suitable for occasions that the surface clearance of the bearing inlet area is smaller than that of the bearing outlet area.
(2) The bearing of the invention contains a good lubricating oil film, has good antifriction and energy-saving performances and has certain bearing capacity.
(3) The bearing has the advantages of simple structure, easy manufacture and low cost.
Drawings
FIG. 1 is a schematic structural view of a prior art inclined plane pad bearing;
FIG. 2 is a schematic structural diagram of a conventional sawtooth pad bearing;
FIG. 3 is a schematic structural view of a prior art ramp platform pad bearing;
FIG. 4 is a schematic structural diagram of a conventional Rayleigh step bearing;
FIG. 5 is a schematic structural diagram of a thrust sliding bearing with a profiled bevel platform according to an embodiment of the present invention, in which interface sliding occurs on both the entire moving surface and the stationary surface of the inlet region;
FIG. 6 is a graph of the film pressure profile of the dimensionless lubricant (5) in the bearing at different θ in an embodiment of the invention;
FIG. 7 is a graph of dimensionless bearing load (W) versus ψ for bearings of different θ in an embodiment of the present invention;
FIG. 8 is a graph showing the dimensionless bearing capacities (W) of bearings at different θ according to the embodiment of the present invention
Figure BSA0000171636820000041
A graph of variation of (d);
FIG. 9 shows the difference ψ and
Figure BSA0000171636820000042
value f coefficient of friction at the fixed pad (1) of the bearing in the example of the inventionaA graph of values;
FIG. 10 shows the difference ψ and
Figure BSA0000171636820000043
the coefficient of friction f at the moving plate (4) of the bearing in the embodiment of the inventionbA map of values.
Where u is the speed of movement of the moving plate relative to the fixed pad, w is the load supported by the bearing per unit contact length, hiThickness of lubricating oil (5) film in bearing entrance region, hoThe thickness of the lubricating oil (5) film at the bearing outlet1Is the width of the inclined plane (3) |2Is the width of the platform surface (2), and theta is an included angle between the inclined surface (3) of the fixed tile block (1) and the platform surface (2) of the fixed tile block (1); lubricating oil is filled in a gap between the two plates, the lubricating oil (5) film slides on the platform surface (2) and the whole plane B (6), and the lubricating oil (5) film does not slide on the inclined surface (3).
In fig. 5: 1-fixed shoe, 2-platform surface, 3-inclined surface, 4-moving plate, 5-lubricating oil, 6-plane B
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Examples
The utility model provides a special-shaped inclined plane platform thrust sliding bearing that interface slided all appears in whole moving surface department and entrance static surface department, as figure 5, including a fixed tile (1), fixed tile (1) working surface includes platform face (2) and inclined plane (3), and the contained angle between inclined plane (3) of fixed tile (1) and platform face (2) of fixed tile (1) is theta, and the value range of theta is: 1.0X 10-5°≤θ≤1.0×10-3°The platform surface (2) is an oleophobic coating surface, and the inclined surface (3) is an oleophilic coating surface of the fixed tile block (1) or an oleophilic natural surface of the fixed tile block (1); and a moving plate (4) having a plane B (6), wherein the plane B (6) is a natural surface of the moving plate (4) or a coated surface of the moving plate (4). The moving plate (4) is paired with the fixed tile (1) to make the moving plate(4) Is parallel to the platform surface (2) of the fixed tile block (1). A wedge-shaped gap is formed between the fixed pad (1) and the moving plate (4), the moving direction of the moving plate (4) relative to the fixed pad (1) is from the small end of the wedge-shaped gap to the large end of the wedge-shaped gap, the wedge-shaped gap is filled with lubricating oil (5), and the gap value at the small end of the wedge-shaped gap, namely the thickness of the lubricating oil (5) film at the bearing inlet area is hiThe gap value at the large end of the wedge gap, namely the thickness of the lubricating oil (5) film at the outlet of the bearing is hoThe dynamic viscosity of the lubricating oil (5) during operation is eta, the moving speed of the moving flat plate (4) relative to the fixed pad (1) is u, and the interface shear strength between the lubricating oil (5) and the plane B (6) is tausbThe shearing strength of the interface between the lubricating oil (5) and the flat table surface (2) is tausaThe width of the platform surface (2) and the width of the inclined surface (3) are respectively l2And l1Defining: lambda [ alpha ]τ＝τsb/τsa，
Figure BSA0000171636820000051
k＝tanθ，ψ＝l1/l2，α＝hi/(l1+l2)，Ho＝ho/hi(ii) a The invention requires that:
Figure BSA0000171636820000052
interface shear strength tau between lubricating oil (5) and inclined plane (3)scGreater than the shear stress at the bevel (3), i.e.: tau issc＞τsb/2-3qvη/hi 2Here, q isvIs the volume flow of the lubricating oil (5) per unit contact length per unit time through the bearing of the invention,
Figure BSA0000171636820000061
thus, the lubricating oil (5) film slips on the land surface (2) and the entire flat surface B (6), while the lubricating oil (5) film does not slip on the inclined surface (3). This results in the interface being present at the whole of the moving surface and at the stationary surface of the inlet zone as referred to in the present inventionThe sliding special-shaped inclined plane platform thrust sliding bearing.
The bearing is suitable for occasions where the surface clearance of the bearing inlet area is smaller than that of the bearing outlet area, which cannot be achieved by the traditional inclined plane platform thrust sliding bearing. The bearing has certain bearing capacity, lower friction coefficient and good lubricating oil film, can play a better antifriction and energy-saving effect, and is used as a bearing part on mechanical equipment.
In the embodiment, the thrust sliding bearing with the special-shaped inclined plane platform, in which interface slippage occurs on the whole moving surface and the static surface of an inlet area, comprises a fixed tile block (1) and a moving flat plate (4), wherein the two tile blocks are made of various grades of steel, but the use of other materials is not excluded. The sliding bearing with the special-shaped inclined plane platform and the sliding surface at the whole moving surface and the static surface at the entrance area has the following requirements:
Figure BSA0000171636820000062
and the interface shear strength tau between the lubricating oil (5) and the inclined plane (3)scGreater than the shear stress at the bevel (3), i.e.: tau issc＞τsb/2-3qvη/hi 2Here, q isvIs the volume flow of the lubricating oil (5) per unit contact length per unit time through the bearing of the invention,
Figure BSA0000171636820000063
thus, the lubricating oil (5) film slips on the land surface (2) and the entire flat surface B (6), while the lubricating oil (5) film does not slip on the inclined surface (3). The moving plate (4) slides relative to the fixed shoe (1) at a speed u, the direction of the speed u is that one end of the platform surface (2) of the fixed shoe (1) points to one end of the inclined surface (3) of the fixed shoe (1), namely the small end of the wedge-shaped gap between the bearing surfaces points to the large end of the wedge-shaped gap, as shown in figure 5. The platform surface (2) is an oleophobic coating surface, the inclined surface (3) is an oleophilic coating surface of the fixed tile (1) or an oleophilic natural surface of the fixed tile (1), and the plane B (6) is a natural surface of the moving plate (4)The surface is the coating surface of the moving plate (4).
FIG. 5 is a schematic structural view of a bearing according to an embodiment. In fig. 5, u is the speed of movement of the moving plate (4) relative to the fixed pad (1), w is the load supported by the bearing per unit contact length, hiThickness of lubricating oil (5) film in bearing entrance region, hoThe thickness of the lubricating oil (5) film at the bearing outlet1Is the width of the inclined plane (3) |2Is the width of the platform surface (2), and theta is an included angle between the inclined surface (3) of the fixed tile block (1) and the platform surface (2) of the fixed tile block (1). The lubricating oil (5) film slides on the platform surface (2) and the whole plane B (6), and the lubricating oil (5) film does not slide on the inclined plane (3); lubricating oil (5) is filled in a gap between the two plates, the platform surface (2) is an oleophobic coating surface, the inclined surface (3) is an oleophilic coating surface of the fixed tile (1) or an oleophilic natural surface of the fixed tile (1), and the plane B (6) is a natural surface of the moving flat plate (4) or a coating surface of the moving flat plate (4).
Compared with the traditional hydrodynamic lubrication inclined plane platform pad thrust sliding bearing shown in fig. 3, the bearing of the invention has substantial changes in structure, adopts the wedge-shaped gap dispersed between the bearing surfaces, breaks through the forbidden zone of the traditional lubrication technology, realizes lubrication of a lubricating oil film, and has certain bearing capacity and lower friction coefficient. The bearing of the invention has the advantages of easy manufacture, low cost, good lubricating, antifriction and energy-saving performances and suitability for specific occasions. Therefore, the technical advantages and application values of the bearing are quite obvious.
In the embodiment, the moving plate (4) and the fixed tile (1) are both made of steel materials, the platform surface (2) of the fixed tile (1) is an (oleophobic) fluorocarbon coating surface, the inclined surface (3) of the fixed tile (1) is an (oleophilic) titanium dioxide coating surface, the plane B (6) of the moving plate (4) is a natural surface of the moving plate (4), the lubricating oil (5) is 5P4E polyphenylene ether oil, the dynamic viscosity of the lubricating oil (5) during working is 0.04 Pa.s, the moving speed of the moving plate (4) is 10m/s, h is 10m/s, and h isi/(l1+l2)＝2.5×10-4Thickness h of lubricating oil (5) film in bearing inlet area i2 μm, the interface shear strength tau between the lubricating oil (5) and the platform surface (2) during operationsa0.02MPa, and the interfacial shear strength τ between the lubricating oil (5) and the plane B (6)sb0.05MPa, and the interfacial shear strength tau between the lubricating oil (5) and the inclined plane (3)scIs 0.4 MPa. When the bearing works, the lubricating oil (5) film slides on the platform surface (2) and the whole plane B (6), and the lubricating oil (5) film does not slide on the inclined plane (3):
(1) when l is1＝2.67mm，l2＝5.33mm，θ＝1.0×10-3°Then, the bearing capacity per unit length dimension of the bearing of the present invention is obtained as w ═ 3.14 × 105N/m, the friction coefficient on the fixed tile block (1) is 0.0013, and the friction coefficient on the moving flat plate (4) is 0.00126.
(2) When l is1＝2.67mm，l2＝5.33mm，θ＝1.0×10-4°Then, the bearing capacity per unit length dimension of the bearing of the present invention is obtained as w ═ 3.17 × 105N/m, the friction coefficient on the fixed pad (1) is 0.00129, and the friction coefficient on the moving plate (4) is 0.00125.
(3) When l is1＝2.67mm，l2＝5.33mm，θ＝1.0×10-5°Then, the bearing capacity per unit length dimension of the bearing of the present invention is obtained as w ═ 3.2 × 105N/m, the friction coefficient on the fixed pad (1) is 0.00128, and the friction coefficient on the moving flat plate (4) is 0.00124.
The bearing of the invention belongs to a special-shaped inclined plane platform thrust sliding bearing, and the bearing surface clearance of the inlet area of the bearing is lower than that of the outlet area of the bearing; the bearing has certain bearing capacity, lower friction coefficient and good antifriction and energy-saving performance, is applied to mechanical equipment, is competent for specific working occasions, and solves the technical problem which cannot be solved by the traditional bearing.
The principle of the invention is illustrated as follows:
according to the established interface slip theory, in the bearing designed by the invention, as the lubricating oil (5) film slips on the platform surface (2) of the fixed pad (1) and the whole plane B (6) of the moving plate (4) and does not slip on the inclined surface (3) of the fixed pad (1), as shown in figure 5, even under the condition that the surface clearance of the bearing inlet area is smaller than that of the bearing outlet area, the flow of the lubricating oil (5) flowing into the bearing is larger than that of the lubricating oil (5) flowing out of the bearing under the driving of the movement of the moving plate (4). Thus, the flow balance condition of the fluid flow in the bearing is broken, and the lubricating oil (5) is continuously accumulated in the bearing and is extruded to form oil pressure. The lubricating oil (5) film pressure formed in the bearing causes pressure gradient flows (namely Poiseuille flows) to be generated in the inlet area and the outlet area of the bearing respectively, the flow rate of the lubricating oil (5) flowing into the bearing is reduced by the pressure gradient flows generated in the inlet area and the outlet area respectively, the flow rate of the lubricating oil (5) flowing out of the bearing is increased, and finally the total flow rate of the lubricating oil (5) flowing into the bearing is equal to the total flow rate of the lubricating oil (5) flowing out of the bearing, so that the flow continuity of the lubricating oil (5) in the bearing is maintained. That is, since the lubricating oil (5) film slips on the platform surface (2) of the fixed pad (1) and the whole plane surface B (6) of the moving plate (4) and does not slip on the inclined surface (3) of the fixed pad (1), under the proper inclination angle theta of the fixed pad (1), the lubricating oil (5) film pressure can be formed in the bearing of the invention, and the formed lubricating oil (5) film pressure enables the bearing of the invention to have the load bearing capacity. Due to the presence of the film of lubricating oil (5) and the low shear strength of the interface between the lubricating oil (5) and the land surface (2) and the plane B (6), the bearing of the present invention has a low coefficient of friction with little to negligible wear of the bearing surfaces. This is the principle of the bearing of the present invention.
FIG. 6 shows the equation when hi/(l1+l2)＝2.5×10-4、
Figure BSA0000171636820000081
And psi ═ l1/l2The film pressure distribution of the dimensionless lubricant (5) in the bearing at different θ in the example of the present invention is 0.5. In fig. 6, X is X/(l)1+l2)，
Figure BSA0000171636820000082
P＝phiV (u η), p is the lubricating oil (5) film (dimension) pressure. The curves in fig. 6 almost overlap, but the fact shows that the lubricating oil (5) film pressure in the bearing of the present invention increases as θ decreases.
FIG. 7 is a schematic view of aGoes out when hi/(l1+l2)＝2.5×10-4、
Figure BSA0000171636820000091
And
Figure BSA0000171636820000092
the non-dimensional bearing capacity (W) of the bearing under different theta in the embodiment of the invention is a curve along with psi. In fig. 7, W is W/(u η), W is the load supported by the bearing per unit contact length, u is the moving speed of the moving plate (4) relative to the fixed pad (1), η is the dynamic viscosity of the lubricating oil (5) during operation, and ψ is ll/l2. It can be seen from figure 7 that for a given value of theta, when ψ > 0.5, the bearing load of the bearing of the present invention decreases as ψ increases.
FIG. 8 shows the equation when hi/(l1+l2)＝2.5×10-4、
Figure BSA0000171636820000093
And psi ═ l1/l2When the bearing capacity is 0.5, the dimensionless bearing capacity (W) of the bearing under different theta in the embodiment of the invention follows
Figure BSA0000171636820000094
The change curve of (2). In fig. 8, W is defined the same as in fig. 7,
Figure BSA0000171636820000095
τsbis the interfacial shear strength between the lubricating oil (5) and the plane B (6), u is the moving speed of the moving flat plate (4) relative to the fixed pad (1), eta is the dynamic viscosity of the lubricating oil (5) during operation, hiThe thickness of the lubricating oil (5) film is the bearing inlet area (see fig. 5). As seen in FIG. 8, for a given value of θ, the value of θ is varied with
Figure BSA0000171636820000096
And the bearing capacity of the bearing is linearly increased.
FIG. 9 shows the equation when hi/(l1+l2)＝2.5×10-4、
Figure BSA0000171636820000097
And θ is 1.0 × 10-3°Different in time psi and
Figure BSA0000171636820000098
value f coefficient of friction at the fixed pad (1) of the bearing in the example of the inventionaThe value is obtained. In the context of figure 9 of the drawings,
Figure BSA0000171636820000099
is the same as in fig. 8. As can be seen from fig. 9, the coefficient of friction value at the fixed pad (1) of the bearing of the present invention is relatively low, even much lower than that of conventional fluid lubricated ramp platform pad thrust sliding bearings. This shows that the bearing of the present invention has good antifriction and energy saving effect. It can also be seen from fig. 9 that
Figure BSA00001716368200000910
Increasing the coefficient of friction value (f) at the fixed pad (1) of the bearing of the inventiona) And decreases.
FIG. 10 shows the equation hi/(l1+l2)＝2.5×10-4、
Figure BSA00001716368200000911
And θ is 1.0 × 10-3°Different in time psi and
Figure BSA00001716368200000912
the coefficient of friction f at the moving plate (4) of the bearing in the embodiment of the inventionbThe value is obtained. In the context of figure 10 of the drawings,
Figure BSA00001716368200000913
is the same as in fig. 8. As can be seen from fig. 10, the coefficient of friction values at the moving plate (4) of the bearing of the present invention is relatively low, even much lower than that of conventional fluid lubricated ramp platform pad thrust sliding bearings. This shows that the bearing of the present invention has good antifriction and energy saving effect. It can also be seen from FIG. 10 that
Figure BSA00001716368200000914
Increasing the value of the coefficient of friction (f) at the moving plate (4) of the bearing of the inventionb) And decreases.

Claims (1)

1. A thrust sliding bearing with a special-shaped inclined plane platform and a sliding surface, wherein the sliding surface of the platform is a sliding surface, the sliding surface of the entrance area is a sliding surface, the sliding surface of the sliding surface, the gap value at the small end of the wedge gap, namely the thickness of the lubricating oil (5) film at the inlet area of the bearing is hiThe gap value at the large end of the wedge gap, namely the thickness of the lubricating oil (5) film at the outlet of the bearing is hoThe dynamic viscosity of the lubricating oil (5) during operation is eta, the moving speed of the moving flat plate (4) relative to the fixed pad (1) is u, and the interface shear strength between the lubricating oil (5) and the plane B (6) is tausbThe shearing strength of the interface between the lubricating oil (5) and the flat table surface (2) is tausaThe width of the platform surface (2) and the width of the inclined surface (3) are respectively l2And l1Defining: lambda [ alpha ]τ＝τsb/τsa，
Figure FSB0000191956290000011
k＝tanθ，ψ＝l1/l2，α＝hi/(l1+l2)，Ho＝ho/hi(ii) a The method is characterized in that: the value range of theta is as follows: 1.0X 10-5°≤θ≤1.0×10-3°The platform surface (2) is a fluorocarbon coating surface, the inclined surface (3) is a titanium dioxide coating surface, the plane B (6) is a natural surface of a steel part, and the lubricating oil (5) is 5P4E polyphenylEthereal oils, lambdaτSatisfies the following conditions:
Figure FSB0000191956290000012
interface shear strength tau between lubricating oil (5) and inclined plane (3)scGreater than the shear stress at the bevel (3), i.e.: tau issc＞τsb/2-3qvη/hi 2Here, q isvIs the volume flow of the lubricating oil (5) per unit contact length through the bearing per unit time,
Figure FSB0000191956290000013
the lubricating oil (5) film slips on the platform surface (2) and the whole plane B (6), and the lubricating oil (5) film does not slip on the inclined surface (3).
CN201811171465.8A 2018-09-20 2018-09-20 Special-shaped inclined plane platform thrust sliding bearing with interface slippage at whole moving surface and inlet area static surface Active CN109139699B (en)

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