CN107687375A - Two stroke Heavy End Aviation Fuel piston engine cylinders cover inner wall laser micro forming structure - Google Patents
Two stroke Heavy End Aviation Fuel piston engine cylinders cover inner wall laser micro forming structure Download PDFInfo
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- CN107687375A CN107687375A CN201710610356.0A CN201710610356A CN107687375A CN 107687375 A CN107687375 A CN 107687375A CN 201710610356 A CN201710610356 A CN 201710610356A CN 107687375 A CN107687375 A CN 107687375A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/18—Other cylinders
- F02F1/20—Other cylinders characterised by constructional features providing for lubrication
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F5/00—Piston rings, e.g. associated with piston crown
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention discloses a kind of cylinder liner internal wall laser micro molding construction design method for being used for two stroke aviation piston engines driving lubrication, by the analysis modeling for the friction pair boundary lubrication that most serious is worn to piston ring and cylinder and piston skirt cylinder sleeve these two pair, the micro forming for optimizing arrangement regulation is targetedly arranged in cylinder liner surface, various abrasive particles are made to fill out in micro forming pit in stroke above and below piston and piston-ring packing, prevent from pulling cylinder sleeve, so as to extend the life-span of cylinder sleeve and its engine；Secondly using the micro forming for optimizing arrangement regulation come the motion of tissue lubricating oil film, prevent oil film from interrupting, and reduce movement velocity of the lubricating oil film along cylinder axial direction, increase reduces the amount that lubricating oil enters combustion chamber along the circumferential component velocity of piston ring, with this, reduces the consumption of lubricating oil, increase simultaneously along the circumferential oil film flow of piston ring, lubrication is set to be improved, the sealing of Piston volume tube is improved simultaneously, and oil consumption is reduced.
Description
Technical field
The present invention relates to a kind of process field of two strokes Heavy End Aviation Fuel piston engine cylinder set surface topography, specifically relate to
A kind of and aviation piston engine cylinder jacket laser surface micro-moulding construction.
Background technology
" heart " of the two-stroke Heavy End Aviation Fuel piston engine as aircraft, in cylinder combustion gas caused by compression ignition heavy oil push away
Piston is axially reciprocating along cylinder sleeve, and the rotation that the reciprocating motion of piston is converted into bent axle by toggle is transported
Move so as to output torque.It is compact-sized, in light weight, thermic load is big due to being two-cycle engine, piston ring in this process
Abrasion between group and cylinder jacket and piston skirt and cylinder jacket is that two couple that most serious is worn in cylinder assembly rubs
Pair is wiped, high temperature, high pressure is constantly in and has metal fillings and the work of the insufficient caused hard carbon of burning and corrosive medium
Under condition, friction and lubricating condition are totally unfavorable.Excessive wear can cause oil leak, gas leakage, engine efficiency to decline and pull cylinder sleeve,
Reduce the life-span of engine, therefore the optimization that anti-attrition lubrication is carried out to these two pair friction pair is very crucial.Show according to correlative study,
Frictional dissipation accounts for 40% in all energy losses of engine, wherein, the cylinder sleeve of piston ring one and piston skirt-cylinder sleeve it
Between frictional dissipation account for the 48%-80% of total friction head, and the about 65%-75% of the cylinder sleeve friction loss of piston ring one comes
From in piston ring, therefore the abrasion for improving engine scuffing situation most serious friction pair is the most notable to engine antifriction effect.
And its main function of piston skirt in another pair key friction pair is to be oriented to, bear piston side force and heat transfer etc., piston skirt
After portion subjects the coupling of mechanical load and thermic load and deformed at work, its shape requirement is remained to casing wall still
Good fitting is so kept, there is enough effective pressure areas, and appropriate oil clearance can be formed, is made with obtaining optimal lubrication
Rubbed with improving, this design to piston skirt molded line proposes very high requirement.So, cylinder prepareding gap just seems particularly heavy
Will, can neither be excessive, can not be too small, cylinder prepareding gap crosses the aggravation that conference causes engine knock to produce noise and vibration, and between cylinder
Gap is too small to produce scuffing of cylinder bore or stuck, reduce engine life.Lubrication is to reduce the important technical of fretting wear consumption, such as
On the premise of where ensureing that Piston volume tube seals to combustion chamber gases, it is obtained good lubrication and just rubbed as solution engine
Wear problem is wiped, improves the key of engine fuel efficiency and service life.
Cylinder-barrel surface treatment technology is quickly grown in recent years as the controlling technology for improving mechanical friction performance.Experiment card
Bright, the micro asperities on piston ring-cylinder liner surface can effectively improve the lubricant effect of two friction surfaces.Major programme has to cylinder
Cover inwall and carry out honing processing or micro forming processing, make it have certain lines, pit etc., these microcosmic lines and pit can
To store lubricating oil, can obtain preferably moving lubricating oil film, it is highly beneficial to reducing friction.Cylinder liner surface treatment technology mainly has
Mechanical honing and laser micro molding, mechanical honing application is more early, technical maturity, although the simple cost of process equipment is low, obtains
Lines can not be regulated and controled as needed, and independent pit can not be processed.And laser has been drawn into cylinder from the seventies
Surface treatment in, and continue to develop, honing technique substituted with laser micro molding technique, there is controllability, precision height, reticulate pattern is equal
It is even, and processing cost is low, it is simple to operate, it is easy to adjust, crudy is stable etc. it is unique the advantages of.To cylinder friction pair
The main purpose of the laser treatment on two surfaces is:Micro forming is arranged by laser treatment so that the pit of cylinder liner surface can store
The subparticles such as the metal fillings in cylinder, carbon granules, prevent from pulling cylinder sleeve, while pit can store a certain amount of lubricating oil, by swashing
Photocontrol micro forming arrangement regulation so that the motion of oil film reduces along cylinder axial direction movement velocity, along piston ring circumferential movement speed
Degree increase, lubrication is played while sealing is ensured, is lengthened the life so as to reach anti-attrition, is improved sealing, reduction machine oil disappears
Consumption, the effect for reducing particulate emission.
The content of the invention
The present invention in view of the shortcomings of the prior art, proposes a kind of two stroke Heavy End Aviation Fuel piston engine cylinders set laser table
Face micro-moulding construction, its object is to improve the pattern of its surface micro-moulding according to the working characteristics of air cylinder sleeve of engine, to obtain
Friction pair dynamically lubricating oil film most preferably is obtained, anti-attrition is lengthened the life.
Complete technical scheme of the invention includes：
A kind of air cylinder sleeve of engine inner wall laser micro forming structure, described cylinder include cylinder jacket head M areas, Yi Jifei
The cylinder block N areas of cylinder head, described micro forming structure are：Closeer micro forming is constructed in cylinder jacket head M areas, is constructed in N areas
Relatively thin micro forming；Micro forming use relative to the less spiral reticulate pattern of cylinder axial direction vertical plane gradient, every reticulate pattern
Using pit as unit, formed with point for line, the pit where each reticulate pattern intersection area is reticulate pattern point, between each adjacent reticulate pattern point
With multiple pits.
Preferably, lines with perpendicular to cylinder axial direction, i.e. the circumferential angle theta of cylinder is between 10 ° -15 °.
Preferably, vertical range B of the adjacent reticulate pattern point on cylinder jacket axial direction is 1-1.3mm.
Preferably, adjacent reticulate pattern point is 2-4mm along the vertical range D in cylinder jacket circumference in cylinder jacket.
Preferably, the density that the area in M areas accounts for 1/5, the M areas micro forming of whole interior surface of cylinder liner is N areas micro forming
1.5-2 times of density.
Preferably, the size range of each micro forming pit is：Diameter d is 20-30um, and pit depth z is 15-20um,
Preferably, the upper limit is used in the closeer M areas of cylinder head reticulate pattern.
Preferably, cylinder jacket uses hyper eutectic silicon titanium alloy material, and its linear expansion coefficient is small, wearability, heat resistance and casting
It is good to make performance.
Engine with the inner wall laser micro forming structure.
Described engine is piston engine, and forms convexity moulding in piston skirt, forms Bidirectional lubricating oil film wedge, shape
Into squeeze film.
Described air cylinder sleeve of engine inner wall laser micro forming construction design method, it is characterised in that comprise the following steps：
1) displacement x of piston ring and the speed v of piston ring are obtained according to the structural parameters of rotating speed and toggle：
In above formula,For crank angle, ω is angular velocity of crankshaft, and λ is crank to connecting rod length ratio, and λ=r/l, r are throw of crankshaft, l
For length of connecting rod；
2) by gas leakage adiabatic reversible flow equation (3), The Ideal-Gas Equation (4) and mass-conservation equation (5)
Establish the gas leakage model of piston ring gap：
Δ m=qi-1-qi (5)
In above formula, qiFor the gas flow at i-th of gap-clearance of piston rings,C is flow system
Number, AiFor i-th of gap-clearance of piston rings actual internal area, k is adiabatic exponent, RgFor gas constant, TiTo flow through i-th of ring cavity gas
The thermodynamic temperature of body, PiFor gas pressure in i-th of ring cavity, miFor the gaseous mass in i-th of ring cavity, Δ m is to flow through ring cavity
Gas mass flow；
Described piston engine piston uses 3 compression rings and 1 oil ring, p1For each crank angle lower combustion chamber pressure
Value, p4For crankcase pressure, steady state value is taken；
Obtain final gas leakage calculation formula：
In above formula, ViFor i-th of ring cavity volume；
The piston engine Piston volume tube includes 4 pistons, has 3 closed cavities, obtains 3 first-order ordinary differential equation systems
Into equation group, solve the differential equation group (6) using runge kutta method, the pressure distribution of each cavity be calculated；
3) be directed to piston ring-cylinder liner friction pair, it is assumed that cylinder sleeve is motionless, only piston ring produce motion, and the direction of motion with
Cylinder sleeve axially retains consistent, ignores piston ring circumferential speed, and lubrication problem is described using following one-dimensional equations：
In formula, u is the movement velocity of piston, and ρ is the density of lubricating oil；D is lubricating oil film thickness；η is the power of lubricating oil
Viscosity, p are lubricating oil film fluid pressure；φxFor the pressure flow factor on x directions, φsFor shear flow factor, nothing is introduced
Dimensional parameters Film Thickness Ratio D, orderσ is poor for the composite roughness of piston ring and cylinder sleeve mark,For contact factor,For the average value of actual oil film thickness, h is nominal oil film thickness, and t is the time；
Boundary condition uses the Renolds boundary condition condition without air pocket, wherein pi-1、piRespectively piston ring upper and lower sides gas pressure
Power, boundary condition is tried to achieve by above gas leakage calculation formula：
4) foundation of the counterweight balance equation of piston ring body is carried out, radial force is carried out to the piston ring of unit circumference length
Analysis, is balanced equation：
F1+F2=Fo+Fg (9)
In formula, F1、F2It is gaseous-pressure and piston ring elastic force respectively, gaseous-pressure depends on pi-1、pi。FgAnd FoRespectively
The bearing capacity and oil film bearing capacity of micro-bulge；
5) simultaneous Reynolds equation (7) and piston ring counterweight balance equation (9) solve oil film thickness, Film Thickness Ratio, oil film pressure
Distribution, frictional force, friction power loss parameter；Foundation above-mentioned parameter value, the layout type of the micro forming of inboard wall of cylinder liner is set.
The device have the advantages that：
1. the present invention is controlled to the direction of motion of oil film in cylinder, makes to be axially moved speed reduction along cylinder jacket, prevent
Only lubricating oil enters combustion chamber, reduces the consumption of lubricating oil, improves the emission performance of engine；Pass through the work of micro forming simultaneously
With increasing oil film along the circumferential component velocity of piston ring, make oil film that along piston ring circumferential movement, it is special to improve lubrication as much as possible
Property.
2. the micro forming produced by laser of the present invention, a certain amount of lubricating oil in pit memory storage, cylinder ensure that
The certain oil film thickness of wall, and oil film is increased along the circumferential movement velocity of piston ring by the arranged of micro forming, make oil
Film is more along piston ring circumferential movement, so as to improve the sealing of piston ring.
3. the micro forming that the present invention is produced by laser, will when piston ring does relative motion relative to micro forming pit
It is stored in due to sticking friction or into particulate caused by cylinder or burning in pit, prevents from pulling cylinder sleeve.
4. the present invention carries out laser micro molding using hyper eutectic silicon titanium alloy inner surface of cylinder liner, its linear expansion coefficient is small, resistance to
Mill property, heat resistance and good casting property, improve stability and the life-span of engine.
5. the present invention is designed piston skirt so that the convexity moulding of piston skirt forms Bidirectional lubricating oil film wedge,
In piston radial direction, piston just has higher bearing capacity, advantageously reduces the friction and wear on piston skirt surface, ensures
Cylinder liner internal wall certain oil film thickness.
6. present invention improves the semi-dry friction between piston ring and cylinder jacket, make piston ring with being in dry before cylinder wall
The position of friction is lubricated, and makes lubrication more uniform, improves frictional behavior, reduces piston ring scuffing.
Brief description of the drawings
Fig. 1 is a kind of global distribution schematic diagram of cylinder-barrel surface laser micro molding construction of the present invention.
Fig. 2 a are the micro forming schematic diagram for the laser reticulate pattern form that the present invention is arranged in interior surface of cylinder liner.
Fig. 2 b are the simplified schematic diagram for the laser micro molding pit that the present invention is arranged in interior surface of cylinder liner.
Fig. 3 a are the toggle sketch of the invention based on certain two-stroke aviation piston engine.
Fig. 3 b are the piston ring of the present invention and the relative position of annular groove.
Fig. 4 is the piston gas bypass passage of the present invention.
Fig. 5 is inventive piston ring group leakage path.
Fig. 6 is that inventive piston ring lubricates radial force schematic diagram.
Embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description.
As shown in Figure 1-2, air cylinder sleeve of engine inner wall laser micro forming structure disclosed by the invention, cylinder include cylinder jacket
Head M areas, and cylinder block N areas, closeer micro forming is constructed in cylinder jacket head M areas, the relatively thin micro forming of construction in N areas；It is micro-
Moulding use relative to the less spiral reticulate pattern of cylinder axial direction vertical plane gradient, every reticulate pattern using pit as unit, with
Point is formed for line, and the pit where each reticulate pattern intersection area is reticulate pattern point, has multiple pits between each adjacent reticulate pattern point, line
Road with perpendicular to cylinder axial direction, i.e. the circumferential angle theta of cylinder is between 10 ° -15 °, and adjacent reticulate pattern point is in cylinder jacket axial direction
On vertical range B be 1-1.3mm, adjacent reticulate pattern point is 2-4mm along the vertical range D in cylinder jacket circumference in cylinder jacket, M areas
The density of area 1/5, the M areas micro forming that accounts for whole interior surface of cylinder liner be 1.5-2 times of N areas micro forming density, each
The size range of micro forming pit is：Diameter d is 20-30um, and pit depth z is 15-20um, it is preferred that cylinder head reticulate pattern compared with
Close M areas use the upper limit, and cylinder jacket uses hyper eutectic silicon titanium alloy material, and its linear expansion coefficient is small, wearability, heat resistance and casting
It is good to make performance, engine is piston engine, and forms convexity moulding in piston skirt, forms Bidirectional lubricating oil film wedge, is formed and squeezed
Press oil film.
As seen in figures 3-6, friction pair film lubrication belongs to boundary layer lubrication problem, and boundary layer lubrication modeling need to be with there is rotation
Reynolds equation combination piston ring counterweight balance equation.Laser micro molding is carried out in hyper eutectic silicon titanium alloy cylinder liner surface, is made to micro-
The size characteristic of type and the design of arranged rule firstly the need of cylinder liner internal wall dynamic lubrication oil film pressure distribution and
Carried out under the conditions of flow distribution is known, and the anti-attrition of piston ring combination cylinder jacket lubrication operating mode is needed with the pressure of piston ring gap
Power is distributed to provide boundary condition and load-up condition.Secondly the solution of piston ring gap pressure distribution needs to establish Piston volume tube
Gas leakage model calculates, and the gas leakage model of Piston volume tube is gas-flow equation by Piston volume tube, mass conservation law
And The Ideal-Gas Equation (models, it is assumed that the combustion gas for entering crankcase by combustion chamber by piston ring is reason for convenience
Think gas) simultaneous foundation.And the gas leakage for finally analyzing Piston volume tube needs the fortune to piston ring in each stroke of engine
Emotionally condition has sufficient understanding.
Using certain horizontal opposition type two-stroke twin-tub Heavy End Aviation Fuel piston engine as research object, according to the calculating established
Model, the optimal layout form of micro forming is obtained, to reduce the axial movement speed of oil film, and increase circumferential component velocity, organized
The direction of motion of oil film, so as to reach anti-attrition lubrication, improve reliability and the life-span of engine.
As shown in Figure 3, for two stroke engine, the motion analysis of piston ring is carried out.Piston ring is entirely being circulated throughout
There are two kinds of motion modes in journey, be that piston ring follows piston reciprocating vertically in cylinder first, next to that in cylinder
It is interior up and down stop nearby piston ring from a side of annular groove move quickly into another side complete commutation, this process be by
What the size and Orientation of the frictional force between the gas force and cylinder sleeve of gravity, both sides suffered by piston ring determined.
As shown in Figure 3 a, piston ring under the drive of piston along the basic exercise that cylinder axis are reciprocating.According to rotating speed
The displacement of piston ring and the speed of piston ring can be obtained with the structural parameters of toggle：
(1) and in (2) formula,For crank angle, λ is crank to connecting rod length ratio, and λ=r/l, r are throw of crankshaft, and l is length of connecting rod
Degree.
As shown in fig. 3b, piston ring performs relative motion relative to piston.The relative motion of piston ring include circumferential movement,
Axial movement and torsional motion etc..Wherein the piston ring scuffing of cylinder sleeve one and sealing are influenceed maximum to be axially moved, had
Result of study shows that the distortion of piston ring is little to the Lubrication Properties of the Piston Ring of cylinder sleeve one.Calculated to simplify, only
Consider axial movement of the piston ring in annular groove interior edge cylinder-bore axis, it is living due to there is the pin for preventing that piston ring from rotating in annular groove
Plug ring slewing area in annular groove is little, therefore does not also consider the circumferential movement of piston ring.And entirely circulated in piston engine
In, piston ring overwhelming majority in annular groove is to be close to annular groove side surface, transposition and instantaneous completion occurs, therefore piston ring is used
Property power can approximation ignore.
As shown in Figure 4, gas leakage analysis is carried out to Piston volume tube.Combustion gas is leaked into letting out in crankcase by Piston volume tube
The shared two ways of leakage, one kind are to produce relative motion by piston ring and annular groove, are flowed through from ring body and annular groove gap, such as Fig. 4 a
Shown, because most time piston rings and annular groove are close together, therefore the gas leakage of such a form can be ignored not
Meter；Another kind is that as shown in Figure 4 b, gas produces leakage by gap-clearance of piston rings, and the gas leakage of piston ring is all opened from piston ring substantially
Mouth clearance leakage.
The foundation of gas leakage computation model.Leakage path as shown in Figure 5.The gas leakage of the opening of piston ring is carried out
Analysis, establishes hypothesis below：
(1) the flowing equal entropy flux of gas；
(2) ignoring combustion gas, crankcase and chamber pressure become as caused by combustion chamber enters crankcase in the presence of pressure difference
It is dynamic, it is believed that the pressure and temperature of combustion chamber and crankcase is all constant；
(3) combustion gas for assuming leakage is perfect gas；
As it was previously stated, establish by Gas leak flow equation (3), The Ideal-Gas Equation (4) and mass conservation law (5) group
Into gas leakage model：
Δ m=qi-1-qi (5)
(3) in formula,C represents discharge coefficient, and k is adiabatic exponent, because this two-stroke is started
Machine piston uses the combination of three compression rings oil ring with together with, therefore p1For each crank angle lower combustion chamber pressure value, p4For crankcase
Pressure, by assuming that it is steady state value that can be approximately considered.Final gas leakage calculation formula is after arrangement：
For the Piston volume tube containing 4 piston rings, then have 3 closed cavities, can obtain 3 first-order ordinary differential equation systems into
Equation group.The differential equation group (6) is solved using runge kutta method.The pressure distribution of each cavity is calculated.
Lubricated sliding wear model for piston ring-cylinder liner friction pair, it is simultaneous Reynolds equation and piston ring counterweight balance side
The equation group of journey.The pressure distribution for each piston ring gap being calculated further according to gas leakage model, it is the meter of oil film pressure distribution
Calculate and boundary condition and load-up condition are provided.
For piston ring-cylinder liner friction pair, it is assumed that cylinder sleeve is motionless, only piston ring produce motion, and the direction of motion with
Cylinder sleeve axially retains consistent, it is contemplated that keep symmetrical along circumferentially each parameter of piston ring, and circumferential speed very little, it can ignore not
Meter, so lubrication problem can be described with one-dimensional Reynolds equation.
(7) in formula, u represents the movement velocity of piston, and ρ represents the density of lubricating oil；D represents lubricating oil film thickness；η represents profit
The dynamic viscosity of lubricating oil, p represent lubricating oil film fluid pressure；φxRepresent the pressure flow factor on x directions, φsExpression is cut
Cut flow factor.Introduce dimensionless group Film Thickness Ratio D, orderσ is poor for the composite roughness of piston ring and cylinder sleeve mark.
Boundary condition uses the Renolds boundary condition condition without air pocket, wherein pi-1、piPiston ring upper and lower sides gas pressure is represented respectively
Power, tried to achieve by above gas leakage analysis.
I.e.：
As shown in fig. 6, carry out the foundation of the counterweight balance equation of piston ring body.The piston ring of unit circumference length is carried out
Radial force is analyzed, and has equilibrium equation：
F1+F2=FO+Fg (9)
(9) in formula, F1、F2It is gaseous-pressure and piston ring elastic force respectively, gaseous-pressure depends on pi-1、pi。FgAnd FORespectively
Bearing capacity and oil film bearing capacity for micro-bulge.Simultaneous Reynolds equation (7) and piston ring counterweight balance equation (9) can solve
Oil film thickness, Film Thickness Ratio.The various parameters such as oil film pressure distribution and frictional force and friction power loss.According to such parameter value,
By the layout type for the micro forming for setting foregoing inboard wall of cylinder liner, to reduce movement velocity of the oil film along cylinder axial direction,
And increase along the circumferential movement velocity of piston ring so that the lubricating oil into cylinder is reduced, and is reduced consumption of lubricating oil, is improved hair
The emission performance of motivation；Simultaneously by the design of laser micro molding pit, store particulate in cylinder etc. and easily pull on cylinder sleeve
Particle, and store a certain amount of lubricating oil, ensure that certain oil film thickness so that lubrication form is as much as possible in dynamic pressure
In lube range.
It is described above, only it is presently preferred embodiments of the present invention, not the present invention is imposed any restrictions, it is every according to the present invention
Any simple modification, change and the equivalent structure change that technical spirit is made to above example, still fall within skill of the present invention
In the protection domain of art scheme.
Claims (10)
1. a kind of air cylinder sleeve of engine inner wall laser micro forming structure, it is characterised in that described cylinder includes cylinder jacket head M
Area, and the cylinder block N areas of non-cylinder head, described micro forming structure be：Closeer micro forming is constructed in cylinder jacket head M areas,
The relatively thin micro forming of construction in N areas；Micro forming use relative to the less spiral reticulate pattern of cylinder axial direction vertical plane gradient,
Every reticulate pattern is formed, the pit where each reticulate pattern intersection area is reticulate pattern point, each adjacent net using pit as unit with point for line
There are multiple pits between line point.
2. air cylinder sleeve of engine inner wall laser micro forming structure according to claim 1, it is characterised in that lines with it is vertical
In cylinder axial direction, i.e. the circumferential angle theta of cylinder is between 10 ° -15 °.
3. air cylinder sleeve of engine inner wall laser micro forming structure according to claim 1 or 2, it is characterised in that adjacent net
Vertical range B of the line point on cylinder jacket axial direction is 1-1.3mm.
4. air cylinder sleeve of engine inner wall laser micro forming structure according to claim 1 or 2, it is characterised in that adjacent net
Line point is 2-4mm along the vertical range D in cylinder jacket circumference in cylinder jacket.
5. air cylinder sleeve of engine inner wall laser micro forming structure according to claim 1, it is characterised in that the area in M areas
The density for accounting for 1/5, the M areas micro forming of whole interior surface of cylinder liner is 1.5-2 times of N areas micro forming density.
6. air cylinder sleeve of engine inner wall laser micro forming structure according to claim 1, it is characterised in that each micro forming
The size range of pit is：Diameter d is 20-30um, and pit depth z is 15-20um, it is preferred that in the M areas that cylinder head reticulate pattern is closeer
Using the upper limit.
7. air cylinder sleeve of engine inner wall laser micro forming structure according to claim 1, it is characterised in that cylinder jacket uses
Hyper eutectic silicon titanium alloy material, its linear expansion coefficient is small, wearability, heat resistance and good casting property.
8. the engine with any one of the claim 1-8 inner wall laser micro forming structure.
9. engine according to claim 8, it is characterised in that described engine is piston engine, and in piston
Skirt section forms convexity moulding, forms Bidirectional lubricating oil film wedge, forms squeeze film.
10. the air cylinder sleeve of engine inner wall laser micro forming construction design method described in claim any one of 1-8, its feature exist
In comprising the following steps：
1) displacement x of piston ring and the speed v of piston ring are obtained according to the structural parameters of rotating speed and toggle：
In above formula,For crank angle, ω is angular velocity of crankshaft, and λ is crank to connecting rod length ratio, and λ=r/l, r are throw of crankshaft, and l is company
Pole length；
2) established by flow equation (3), The Ideal-Gas Equation (4) and the mass-conservation equation (5) of the adiabatic reversible of gas leakage
The gas leakage model of piston ring gap：
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<mi>p</mi>
<mrow>
<mi>i</mi>
<mo>+</mo>
<mn>1</mn>
</mrow>
</msub>
<msub>
<mi>p</mi>
<mi>i</mi>
</msub>
</mfrac>
<mo>&le;</mo>
<mn>0.546</mn>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>3</mn>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<msub>
<mi>p</mi>
<mi>i</mi>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>m</mi>
<mi>i</mi>
</msub>
<msub>
<mi>R</mi>
<mi>g</mi>
</msub>
<msub>
<mi>T</mi>
<mi>i</mi>
</msub>
</mrow>
<msub>
<mi>V</mi>
<mi>i</mi>
</msub>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>4</mn>
<mo>)</mo>
</mrow>
</mrow>
Δ m=qi-1-qi (5)
In above formula, qiFor the gas flow at i-th of gap-clearance of piston rings,C is discharge coefficient, AiFor
I-th of gap-clearance of piston rings actual internal area, k are adiabatic exponent, RgFor gas constant, TiTo flow through the heating power of i-th of ring cavity gas
Learn temperature, PiFor gas pressure in i-th of ring cavity, miFor the gaseous mass in i-th of ring cavity, Δ m is the gas matter for flowing through ring cavity
Measure flow；
Described piston engine piston uses 3 compression rings and 1 oil ring, p1For each crank angle lower combustion chamber pressure value, p4For
Crankcase pressure, take steady state value；
Obtain final gas leakage calculation formula：
In above formula, ViFor i-th of ring cavity volume；
The piston engine Piston volume tube includes 4 pistons, there is 3 closed cavities, obtain 3 first-order ordinary differential equation systems into
Equation group, the differential equation group (6) is solved using runge kutta method, the pressure distribution of each cavity is calculated；
3) it is directed to piston ring-cylinder liner friction pair, it is assumed that cylinder sleeve is motionless, and only piston ring produces motion, and the direction of motion and cylinder sleeve
Axially retain consistent, ignore piston ring circumferential speed, lubrication problem is described using following one-dimensional equations：
<mrow>
<mfrac>
<mo>&part;</mo>
<mrow>
<mo>&part;</mo>
<mi>x</mi>
</mrow>
</mfrac>
<mrow>
<mo>(</mo>
<msub>
<mi>&phi;</mi>
<mi>x</mi>
</msub>
<mfrac>
<mrow>
<msup>
<mi>&rho;D</mi>
<mn>3</mn>
</msup>
<msup>
<mi>&sigma;</mi>
<mn>2</mn>
</msup>
</mrow>
<mi>&eta;</mi>
</mfrac>
<mfrac>
<mrow>
<mo>&part;</mo>
<mi>p</mi>
</mrow>
<mrow>
<mo>&part;</mo>
<mi>x</mi>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mo>=</mo>
<mn>6</mn>
<mi>u</mi>
<mfrac>
<mrow>
<mo>&part;</mo>
<mrow>
<mo>(</mo>
<msub>
<mi>&rho;&phi;</mi>
<mi>s</mi>
</msub>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<mo>&part;</mo>
<mi>x</mi>
</mrow>
</mfrac>
<mo>+</mo>
<mn>6</mn>
<msub>
<mi>u&rho;&phi;</mi>
<mi>c</mi>
</msub>
<mfrac>
<mrow>
<mo>&part;</mo>
<mi>D</mi>
</mrow>
<mrow>
<mo>&part;</mo>
<mi>x</mi>
</mrow>
</mfrac>
<mo>+</mo>
<mn>12</mn>
<msub>
<mi>&rho;&phi;</mi>
<mi>c</mi>
</msub>
<mfrac>
<mrow>
<mo>&part;</mo>
<mi>D</mi>
</mrow>
<mrow>
<mo>&part;</mo>
<mi>t</mi>
</mrow>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>7</mn>
<mo>)</mo>
</mrow>
</mrow>
In formula, u is the movement velocity of piston, and ρ is the density of lubricating oil；D is lubricating oil film thickness；η is the dynamic viscosity of lubricating oil,
P is lubricating oil film fluid pressure；φxFor the pressure flow factor on x directions, φsFor shear flow factor, dimensionless is introduced
Parameter Film Thickness Ratio D, orderσ is poor for the composite roughness of piston ring and cylinder sleeve mark,For contact factor,For
The average value of actual oil film thickness, h are nominal oil film thickness, and t is the time；
Boundary condition uses the Renolds boundary condition condition without air pocket, and boundary condition is tried to achieve by above gas leakage calculation formula：
<mrow>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<mi>p</mi>
<mo>=</mo>
<msub>
<mi>p</mi>
<mi>i</mi>
</msub>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mi>p</mi>
<mo>=</mo>
<msub>
<mi>p</mi>
<mn>2</mn>
</msub>
<mo>,</mo>
<mfrac>
<mrow>
<mi>d</mi>
<mi>p</mi>
</mrow>
<mrow>
<mi>d</mi>
<mi>x</mi>
</mrow>
</mfrac>
<mo>=</mo>
<mn>0</mn>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>8</mn>
<mo>)</mo>
</mrow>
</mrow>
4) foundation of the counterweight balance equation of piston ring body is carried out, radial force point is carried out to the piston ring of unit circumference length
Analysis, is balanced equation：
F1+F2=FO+Fg (9)
In formula, F1、F2It is gaseous-pressure and piston ring elastic force respectively, gaseous-pressure depends on pi-1、pi。FgAnd FORespectively dimpling
The bearing capacity and oil film bearing capacity of body；
5) simultaneous Reynolds equation (7) and piston ring counterweight balance equation (9) solve oil film thickness, Film Thickness Ratio, oil film pressure distribution,
Frictional force, friction power loss parameter；Foundation above-mentioned parameter value, the layout type of the micro forming of inboard wall of cylinder liner is set.
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Cited By (3)
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| CN110480257A (en) * | 2019-07-12 | 2019-11-22 | 江苏长龄液压股份有限公司 | A kind of manufacturing process of oil cylinder |
| CN112228236A (en) * | 2020-10-20 | 2021-01-15 | 江苏大学 | Internal combustion engine cylinder sleeve and machining method thereof |
| CN112303125A (en) * | 2020-11-02 | 2021-02-02 | 江苏科技大学 | Sliding bearing with micro-modeling on surface and preparation method thereof |
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| CN112303125A (en) * | 2020-11-02 | 2021-02-02 | 江苏科技大学 | Sliding bearing with micro-modeling on surface and preparation method thereof |
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| CN107687375B (en) | 2020-05-05 |
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