CN105650443B - A kind of surface texture and its application based on hydrldynamic pressure lubrication - Google Patents
A kind of surface texture and its application based on hydrldynamic pressure lubrication Download PDFInfo
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- CN105650443B CN105650443B CN201610190401.7A CN201610190401A CN105650443B CN 105650443 B CN105650443 B CN 105650443B CN 201610190401 A CN201610190401 A CN 201610190401A CN 105650443 B CN105650443 B CN 105650443B
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- fluid
- friction
- lubrication
- oleophobic
- friction pair
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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
- F16N—LUBRICATING
- F16N1/00—Constructional modifications of parts of machines or apparatus for the purpose of lubrication
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1428—Cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
-
- 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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Lubricants (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
The invention discloses a kind of surface textures based on hydrldynamic pressure lubrication,It passes through surface modification mode,Oberbau is set to have nanostructure boss,Boss surface layer is covered with the fluoropolymer of low-surface-energy,Make the region that there is oleophobic property,During the secondary generation relative motion of friction,When reaching certain speed of related movement,Surface layer does not have the fluid movement velocity of nanometer land area near wall identical as wall surface speed,There is the fluid of nanometer land area near wall to be generated by liquefied gas with wall surface on surface layer,The compound interface of liquid solid composition,Due to having certain current difference between the liquid in same tangential face,Even the fluid being between the surface of friction pair of parallel relative motion can also make its locally generate pressure due to the presence of speed difference,Be conducive to the secondary two surfaces separation of friction,Form fluid lubrication,Especially the discrete fluid for being distributed in surface of friction pair can also be assembled and generate local pressure by the structure under weary oily operating mode,Conducive to fluid lubrication.
Description
Technical field
The invention belongs to hydrodynamics, tribology and field of surface engineering technique, and in particular to one kind being based on hydrodynamic
The surface texture of lubrication and its application.
Background technology
Limited by measuring technology and under macro-scale Interface Factors influence it is not notable etc. due to, for tradition
Mechanics of viscous fluids, one of basic assumption is boundary without sliding, that is, is considered at the fluid and solid of solid skin
Movement velocity be equal.Early in 1823, French scholar Navier just contemplated the sliding phenomenon of liquid near wall, and
It is proposed that the sliding velocity u (0) of liquid near wall is proportional to the current gradient i.e. shearing rate of liquid, tabular form is as follows：
B is slip length in formula, it is that have slip surface to be extrapolated to point that fluid velocity is zero to the distance of slip surface；
For current gradient, that is, shearing rate.
In recent years, many scholars have done further research, interface sliding with high-precision detecting instrument to slip Theory
Presence be confirmed by experiments, disclosed in Chinese patent CN103438804A, CN101819126A, CN101738166A each
Kind method is realized to interface sliding measurement of length.
Many domestic and foreign literatures have proposed interface oleophobic (hydrophobic) have between property and slip length it is larger contact, it is comprehensive
The experimental study conclusion of many scholars is closed, slip length b is typically in 10 to 30 μm, is based on scale effect, for friction pair
Between for gap, the effect of the boundary slip influence of the hydrodynamic characteristics of fluid between its surface is extremely considerable.And
And with micromachine, the continuous development of MEMS technology, a large amount of micromachine device plays work in Chinese society production
With boundary slip factor has significantly more influence on such mechanical equipment.Therefore, a kind of based on hydrldynamic pressure lubrication
Surface texture, by reasonably improving the interfacial property of friction subtabulation layer with slip Theory to reach preferably lubrication effect
Fruit, the structure energy conservation and environmental protection, recycling-type equipment research and development in will have certain application value.
Invention content
Problem provides a kind of based on fluid lubrication the present invention according to industry technology Development Trend in view of the prior art
Surface texture, the structure is easy to process, simple in structure, widely applicable, can be effectively reduced friction coefficient, reduce friction mill
The features such as damage.
To achieve the above object, the present invention provides the following technical solutions：A kind of surface texture based on hydrldynamic pressure lubrication,
It is characterized in that, the structure forms the oleophobic region (1) of fringe distribution in such a way that surface is modified in surface of friction pair, have
At work, fluid and the surface of solids in unmodified area primarily form liquid-solid interface to the friction pair of the structure, and interface sliding is long
Degree is infinitely close to zero；Fluid in oleophobic region (1) formed it into liquid-gas (3) due to the effect of Van der Waals force and
The compound interface of liquid-solid (4), makes slip length increase, and the friction pair with the surface texture is long due to interface Local Sliding
The otherness of degree, making it, there are speed differences to generate local pressure for fluid near wall under running conditions, rubs to be conducive to two
Secondary surface separation is wiped, fluid lubrication is advantageously formed.
Further, preferably, the surface in the oleophobic region has the boss (2) of nanoscale, boss (2) table
Layer is covered with the fluoropolymer of low-surface-energy, and the boss (2) is cylinder or cuboid, the diameter of corresponding cylinder or
The length of side d=10-300nm of cuboid, spacing g=10-300nm.
Further, preferably, the structure is relied on the adjacent boundary in different boundary slip length region, make near wall
Locate liquid and generate speed difference, oleophobic region shape can be adjusted according to surface of friction pair shape, the interval between oleophobic area (1)
Range n is 0.001-20mm, and width range m is 0.001-20mm.
Further, it preferably, the fluid lubrication formed with the structure is not limited to need convergence type wedge gap, transports
It is secondary that series of parallel interstitial fluid hydrodynamic lubrication friction can be constructed with the structure.
Further, preferably, the structure is based on hydrldynamic pressure lubrication surface of friction pair suitable for all.
Further, preferably, according to the secondary working condition of friction, the structure can apply to movement surface of friction pair and
Static surface of friction pair.
Further, preferably, according to the secondary shape of friction, which can be applied to plane and curved surface.
In addition, the present invention provides a kind of thrust bearing, the table provided by the invention based on hydrldynamic pressure lubrication is utilized
Face structure, and at equal intervals and along several symmetrical oleophobic regions of the center of circle on bearing annulus surface of friction pair.
Further, the present invention provides a kind of low friction hydraulic cylinders, are moistened based on hydrodynamic using provided by the invention
Sliding surface texture, and have several oleophobic areas along piston axis direction equidistantly distributed in hydraulic cylinder piston outer wall, or/and in liquid
Cylinder pressure cylinder barrel outer wall has several oleophobic areas along piston axis direction equidistantly distributed.
Compared with prior art, the beneficial effects of the invention are as follows：
(1), a kind of surface texture based on hydrldynamic pressure lubrication of the present invention, oleophobic area surface layer are modified modified by surface
Mode be made, it is easy to process, it is simple in structure, and work when be not necessarily to other regulating devices；
(2), there is the friction pair of the structure to form stream for a kind of surface texture based on hydrldynamic pressure lubrication of the present invention, surface layer
Body pressure mechanism relies primarily on interfacial liquid current difference, is not limited to need convergence type wedge gap, also, use the structure energy
It is secondary enough to construct series of parallel interstitial fluid hydrodynamic lubrication friction；
(3), a kind of surface texture based on hydrldynamic pressure lubrication of the present invention, can be suitable for different operating modes and different shape
Surface of friction pair, have the characteristics that strong applicability, use scope are wide；
(4), a kind of surface texture based on hydrldynamic pressure lubrication of the present invention applies the friction subtabulation under weary oily operating mode
Local pressure be assembled and be generated to the discrete fluid for being distributed in surface of friction pair can also by face, be conducive to fluid lubrication；
In addition, the present invention have it is easy to process, simple in structure, widely applicable, can be effectively reduced friction coefficient, reduce
The features such as fretting wear.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of surface texture based on hydrldynamic pressure lubrication of the present invention；
Fig. 2 is Tu1Zhong oleophobics area surface close-up schematic view；
Fig. 3 is oleophobic area surface boss and fluid contact condition partial enlarged view；
Fig. 4 is that the present invention applies the fluid-velocity profile in the friction subtask of motion state；
Fig. 5 is that the present invention applies the fluid-velocity profile in the friction subtask of stationary state；
Fig. 6 is the structural schematic diagram of the invention applied in thrust bearing；
Fig. 7 is the schematic diagram of the invention applied in clearance seal hydraulic cylinder piston face；
Fig. 8 is the close-up schematic view of piston face and piston and bore clearances in Fig. 7；
Fig. 9 is the schematic diagram of the invention applied in clearance seal hydraulic cylinder inner wall of cylinder；
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
- 9 are please referred to Fig.1, the present invention provides a kind of technical solution：A kind of surface texture based on hydrldynamic pressure lubrication, should
Structure forms the oleophobic region 1 of fringe distribution, the friction pair with the structure in such a way that surface is modified in surface of friction pair
At work, the fluid Yu the surface of solids in unmodified area primarily form liquid-solid interface, interface sliding infinite in length close to
Zero；Fluid in oleophobic region 1 forms it into the compound boundary with liquid-gas 3 and liquid-solid 4 due to the effect of Van der Waals force
Face makes slip length increase, and the friction pair with the surface texture makes it in work due to the otherness of interface Local Sliding length
There are speed differences to generate local pressure for fluid near wall under the conditions of work, to be conducive to the separation of two surface of friction pair, is conducive to
Form fluid lubrication.
The present invention is based on the relationships between interface boundary slip length and oleophobic property, in such a way that surface is modified, make same
During there are different zones different oleophobic properties, surface there is the friction pair of the structure relative motion occurs on one surface, when
When reaching certain speed of related movement, oleophylic surface layer fluid movement velocity is identical as wall surface speed, oleophobic region near wall oil
The movement velocity of liquid is less than the movement velocity of wall surface.Due to having certain current difference between the liquid in same tangential face, make office
Portion generates pressure, is conducive to the secondary two surfaces separation of friction, forms fluid lubrication.
In the present embodiment, the surface in the oleophobic region has the boss 2 of nanoscale, and 2 surface layer of the boss is covered with
The fluoropolymer of low-surface-energy, the boss (2) are cylinder or cuboid, the diameter or cuboid of corresponding cylinder
Length of side d=10-300nm, spacing g=10-300nm.
The structure is relied on the adjacent boundary in different boundary slip length region, and liquid near wall is made to generate speed
Difference, oleophobic region shape can be adjusted according to surface of friction pair shape, and the interval n between oleophobic area 1 is 0.001-
20mm, width range m are 0.001-20mm.The fluid lubrication formed with the structure is not limited to need between convergence type wedge shape
It is secondary can to construct series of parallel interstitial fluid hydrodynamic lubrication friction with the structure for gap.The structure is suitable for all based on stream
Body hydrodynamic lubrication surface of friction pair.According to the secondary working condition of friction, which can apply to the surface of friction pair of movement and quiet
Surface of friction pair only.According to the secondary shape of friction, which can be applied to plane and curved surface.
Embodiment one
The present invention provides a kind of thrust bearings, as shown in fig. 6, the bearing internal radius d1=10-50mm, outside diameter d 2
=80-100mm, at equal intervals and along the symmetrical 8 oleophobic regions in the center of circle on bearing annulus surface of friction pair, circle shared by each region
Arc angle is 22.5 °, bearing working gap h=1~15 μm.
Embodiment two
The present invention provides a kind of low friction hydraulic cylinders based on oleophobic striped.In hydraulic cylinder piston outer wall along piston axis
Direction equidistantly distributed has several oleophobic areas, structure as shown in Figure 7.In the piston outer wall and Barrel of Hydraulic Cylinders of the hydraulic cylinder
Wall gap is as shown in figure 8, δ=10-15 μm, the oleophobic sector width k=0.1-5mm, spacing l=0.1-5mm.
Embodiment three
A kind of low friction hydraulic cylinder based on oleophobic striped.Equidistantly divide along piston axis direction in hydraulic cylinder drum outer wall
Several oleophobic areas are furnished with, structure is as shown in figure 9, the same implementation of the piston outer wall of the hydraulic cylinder and Barrel of Hydraulic Cylinders inner wall gap
Example 2.As shown in figure 9, the oleophobic sector width k=0.1-10mm, spacing l=0.1-10mm.
A kind of surface texture based on hydrldynamic pressure lubrication of the present invention, oleophobic area surface layer passes through the modified modified side in surface
Formula is made, easy to process, simple in structure, and other regulating devices are not necessarily to when work；There is the friction pair of the structure to be formed on surface layer
Fluid pressure mechanism relies primarily on interfacial liquid current difference, is not limited to need convergence type wedge gap, also, use the structure
It is secondary that series of parallel interstitial fluid hydrodynamic lubrication friction can be constructed；It can be suitable for different operating modes and friction of different shapes is secondary
Surface has the characteristics that strong applicability, use scope are wide；The surface of friction pair under weary oily operating mode is applied, it also can be by discrete point
Local pressure is assembled and generated to the fluid for being distributed in surface of friction pair, is conducive to fluid lubrication；In addition, the present invention have it is easy to process,
It is simple in structure, widely applicable, friction coefficient can be effectively reduced, reduce the features such as fretting wear.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understanding without departing from the principles and spirit of the present invention can carry out these embodiments a variety of variations, modification, replace
And modification, the scope of the present invention is defined by the appended.
Claims (7)
1. a kind of surface texture based on hydrldynamic pressure lubrication, which is characterized in that the structure is being rubbed in such a way that surface is modified
Wipe secondary surface formed fringe distribution oleophobic region (1), with the structure friction pair at work, the fluid in unmodified area with
The surface of solids primarily forms liquid-solid interface, and interface sliding infinite in length is close to zero；Fluid in oleophobic region (1) by
The compound interface with liquid-gas (3) and liquid-solid (4) is formed it into the effect of Van der Waals force, slip length is made to increase, is had
There is the secondary otherness due to interface Local Sliding length of the friction of the surface texture, makes its fluid near wall under running conditions
There are speed differences to generate local pressure, to be conducive to the separation of two surface of friction pair, advantageously forms fluid lubrication；
The surface in the oleophobic region has the boss (2) of nanoscale, and boss (2) surface layer is covered with the fluorine-containing of low-surface-energy
Polymer, the boss (2) are cylinder or cuboid, the diameter of corresponding cylinder or the length of side d=10- of cuboid
300nm, spacing g=10-300nm；
The structure is relied on the adjacent boundary in different boundary slip length region, so that liquid near wall is generated speed difference, is dredged
Oily region shape can be adjusted according to surface of friction pair shape, and the interval n between oleophobic area (1) is 0.001-20mm,
Width range m is 0.001-20mm.
2. a kind of surface texture based on hydrldynamic pressure lubrication according to claim 1, it is characterised in that：With the structure
The fluid lubrication of formation is not limited to need convergence type wedge gap, and series of parallel interstitial fluid can be constructed with the structure
Hydrodynamic lubrication friction is secondary.
3. a kind of surface texture based on hydrldynamic pressure lubrication according to claim 1, it is characterised in that：The structure is applicable in
It is based on hydrldynamic pressure lubrication surface of friction pair in all.
4. a kind of surface texture based on hydrldynamic pressure lubrication according to claim 1, it is characterised in that：It is secondary according to friction
Working condition, the structure can apply to movement surface of friction pair and static surface of friction pair.
5. a kind of surface texture based on hydrldynamic pressure lubrication according to claim 1, it is characterised in that：It is secondary according to friction
Shape, which can be applied to plane and curved surface.
6. a kind of thrust bearing, it is characterised in that：It is based on hydrodynamic using one kind described in claim 1-5 any one
The surface texture of lubrication, and at equal intervals and along several symmetrical oleophobic regions of the center of circle on bearing annulus surface of friction pair.
7. a kind of low friction hydraulic cylinder, it is characterised in that：It is based on fluid using one kind described in claim 1-5 any one
The surface texture of hydrodynamic lubrication, and have several oleophobic areas along piston axis direction equidistantly distributed in hydraulic cylinder piston outer wall, or/
There are several oleophobic areas along piston axis direction equidistantly distributed in hydraulic cylinder drum outer wall.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610190401.7A CN105650443B (en) | 2016-03-29 | 2016-03-29 | A kind of surface texture and its application based on hydrldynamic pressure lubrication |
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| CN201610190401.7A CN105650443B (en) | 2016-03-29 | 2016-03-29 | A kind of surface texture and its application based on hydrldynamic pressure lubrication |
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| CN107035950B (en) * | 2017-05-31 | 2018-09-11 | 青岛理工大学 | One kind is from enhanced raceway face of oil-collecting and preparation method thereof |
| CN108645757B (en) * | 2018-05-03 | 2019-12-24 | 华中科技大学 | Device and method for measuring effective sliding length of super-hydrophobic surface |
| EP3761123A1 (en) * | 2019-07-05 | 2021-01-06 | Association Suisse pour la Recherche Horlogère | Micromechanical component allowing containment of a lubricating substance |
| CN113883166A (en) * | 2021-09-30 | 2022-01-04 | 浙江工业大学 | Method for improving distribution uniformity of oil film pressure field of hydrostatic bearing |
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| JP3585420B2 (en) * | 2000-04-20 | 2004-11-04 | 株式会社椿本チエイン | Rolled product for chain and method of manufacturing the same |
| CN1230272C (en) * | 2003-07-29 | 2005-12-07 | 吉林大学 | Method of rasing wearability of mechanical element |
| CN101329509A (en) * | 2008-07-29 | 2008-12-24 | 西安交通大学 | Method for manufacturing drag reduction surface |
| CN101634324A (en) * | 2009-08-10 | 2010-01-27 | 李新桥 | Material surface ultra-oleophobic structure |
| CN103868813B (en) * | 2014-03-19 | 2016-03-30 | 哈尔滨理工大学 | The method of stripe Surface Texture and raising material wear resistance thereof |
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Application publication date: 20160608 Assignee: JIANGSU KENAILI MACHINERY MANUFACTURING Co.,Ltd. Assignor: WUHAN UNIVERSITY OF SCIENCE AND TECHNOLOGY Contract record no.: X2020980000570 Denomination of invention: Surface structure based on dynamic-pressure lubrication of fluid and application thereof Granted publication date: 20180814 License type: Exclusive License Record date: 20200310 |