CN209278002U - A kind of offset crankshaft formula engine - Google Patents
A kind of offset crankshaft formula engine Download PDFInfo
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- CN209278002U CN209278002U CN201822210682.5U CN201822210682U CN209278002U CN 209278002 U CN209278002 U CN 209278002U CN 201822210682 U CN201822210682 U CN 201822210682U CN 209278002 U CN209278002 U CN 209278002U
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- piston
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- crankshaft
- crank
- connecting rod
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Abstract
The utility model relates to engine design and manufacturing fields, especially a kind of offset crankshaft formula engine, including cylinder, piston, piston pin, connecting rod, crank and crank-pin, piston is set in cylinder, connecting rod is linked together by piston pin and piston, crank is linked together by crank-pin and connecting rod, crankshaft need to be deviated certain distance to crank-pin down direction by crankshaft biasing, using piston pin center as the center of circle, length of connecting rod and throw of crankshaft and do circular arc for radius, the intersection point of straight line where circular arc and offset distance is the position at offset crankshaft center；The notch that evacuation connecting rod and crank-pin is machined at grazing occurs for connecting rod and crank-pin and cylinder, this starts function rationally to utilize the difference of coefficient of friction, reduce the friction of cylinder wall and piston ring, improve engine efficiency, also can get reduces highest detonation pressure, improves ventilation quality, increases piston stroke and other effects, be conducive to engine economical operation, there is certain economic benefit.
Description
Technical field
The utility model relates to engine design and manufacturing field, especially a kind of offset crankshaft formula engines.
Background technique
With the increasingly raising of people's living standard, automobile has come into huge numbers of families, and the ownership of automobile quickly improves, vapour
Vehicle consumer is very sensitive to the fuel consumption of vehicle, this is related to the use cost of automobile.Although using gasoline, diesel oil
It is not the direction that the mankind obtain the energy, but within significant period of time from now on, diesel locomotive will be the master of automobile market
It leads, before new energy, new technology are universal, the efficiency for improving gasoline engine and diesel engine still has realistic meaning.
Currently, used engine is mostly positive shaft generator on automobile, i.e., the crankshaft center line of gasoline engine and diesel engine with
Cylinder centerline is theoretically in same plane, and this kind of engine faces two large problems in design and use: first is portion
Part to bear oil gas burning generate up to 5MPa(gasoline engine) or 9MPa(diesel engine) explosion pressure；Second is kinematic pair
Abrasion, wherein especially the most serious and uncontrollable with the abrasion of cylinder jacket and piston ring, above-mentioned there are problem is engine operating condition
Decline, or even the most common reason of failure is generated, above-mentioned influence cannot be eliminated, can only be improved by various methods, bent
Axis biasing facilitates this improvement, and crankshaft biasing is only changed in the case where the important parameters such as crank, connecting rod, cylinder diameter are constant
The dynamic property of engine and a kind of effective way of economy are improved in the position of its crankshaft center.
Summary of the invention
For overcome the deficiencies in the prior art, the utility model provides a kind of offset crankshaft formula engine, crankshaft pass through to
Crank-pin down direction deviates certain distance, makes engine crankshaft axis and cylinder centerline not in the same plane, to drop
The friction of low cylinder wall and piston ring and improve engine efficiency.
The technical scheme adopted by the utility model to solve the technical problem is as follows: a kind of offset crankshaft formula engine, including
Cylinder, piston, piston pin, connecting rod, crank and crank-pin；Piston is set in cylinder, and piston pin is set on piston, connecting rod
It is linked together by piston pin and piston, crank is linked together by crank-pin and connecting rod；Before crankshaft does not bias, crankshaft axis
Line and cylinder centerline deviate certain distance to crank-pin down direction in the same plane, by crankshaft, are with piston pin center
The center of circle, length of connecting rod and throw of crankshaft and do circular arc for radius, the intersection point of straight line where circular arc and offset distance be bias it is bent
The position of axis center；Crankshaft from deviating back link and crank-pin and grazing occurs for cylinder bottom to prevent, connecting rod and crank-pin with
The notch that evacuation connecting rod and crank-pin is processed at grazing occurs for cylinder.
Further, the type of engine is in-line four stroke trunk engines, and cylinder type includes arranged in a straight line
Formula and V-arrangement arranged type.
Further, engine selected parameter are as follows: cylinder bore is 140 millimeters, and stroke is 150 millimeters, throw of crankshaft
It is 75 millimeters, length of connecting rod is 200 millimeters, and offset distance is 50 millimeters.
Further, crankshaft steering is clockwise.
The beneficial effects of the utility model are: a kind of offset crankshaft formula engine, this starts function rationally to utilize friction system
Several difference, reduces the friction of cylinder wall and piston ring, and offset crankshaft engine can will be consumed by a part of internal balance
Function switchs to externally export, and improves engine efficiency, and also can get reduces highest detonation pressure, improves ventilation quality, increases piston stroke
And other effects, be conducive to engine economical operation, there is certain economic benefit.
Detailed description of the invention
The present invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is horizontal section schematic diagram where the positive axis cylinder center line of the utility model.
Fig. 2 is horizontal section schematic diagram where the offset crankshaft formula cylinder center line of the utility model.
Fig. 3 is the positive axis engine piston position of the utility model and the schematic diagram of crank angle relationship.
Fig. 4 is the offset crankshaft formula engine piston position of the utility model and the schematic diagram of crank angle relationship.
Fig. 5 is the piston motion position view of the positive shaft generator of the utility model.
Fig. 6 is the piston motion position view of the offset crankshaft formula engine of the utility model.
Fig. 7 is the positive shaft generator and offset crankshaft formula engine piston running position curve comparison figure of the utility model.
Fig. 8 is the piston of the utility model or more stop schematic diagram.
Piston pin and crank-pin force analysis are illustrated when Fig. 9 is the positive axis engine piston downlink acting of the utility model
Figure.
Piston pin and crank-pin stress point when Figure 10 is the offset crankshaft formula engine piston downlink acting of the utility model
Analyse schematic diagram.
Piston pin and crank-pin force analysis are illustrated when Figure 11 is the positive axis engine piston uplink compression of the utility model
Figure.
Piston pin and crank-pin stress point when Figure 12 is the offset crankshaft formula engine piston uplink compression of the utility model
Analyse schematic diagram.
1. cylinder in figure, 2. pistons, 3. piston pins, 4. connecting rods, 5. crankshaft centers, 6. inclined crankshaft centers, 7. offset distances, 8.
Crank, 9. crank-pins, 10. cylinder centerlines, 11. crank angles, 12. first vertically away from 13. second vertically away from 14. positive axis hair
Motivation piston running position curve, 15. off-axis engine piston running position curves, 16. piston top dead centers, under 17. pistons only
Point.
Specific embodiment
Referring to attached drawing, a kind of offset crankshaft formula engine, including cylinder 1, piston 2, piston pin 3, connecting rod 4, crank 8 and song
Handle pin 9；Piston 1 is set in cylinder 1, and piston pin 9 is set on piston 2, and connecting rod 4 is connected to by piston pin 3 with piston 2
Together, crank 8 is linked together by crank-pin 9 with connecting rod 4, and the type of engine is in-line four stroke trunk piston engines
Machine, 1 type of cylinder include formula arranged in a straight line and V-arrangement arranged type, and 1 cylinder diameter of cylinder is 140 millimeters, and stroke is 150 millimeters, crank 8
Radius is 75 millimeters, and 4 length of connecting rod is 200 millimeters；Before crankshaft does not bias, crankshaft center line and cylinder centerline 10 are in same plane
It is interior, by crankshaft to 9 down direction of crank-pin deviate certain distance, crankshaft steering be it is clockwise, offset distance be 50 millimeters, with piston
3 center of pin is the center of circle, 4 length of connecting rod and 8 radius of crank and do circular arc, the friendship of circular arc and 7 place straight line of offset distance for radius
Point is the position at offset crankshaft center 6；To prevent crankshaft from deviating back link 4 and crank-pin 9 and the generation grazing of 1 bottom of cylinder,
The notch that evacuation connecting rod 4 and the pin of crank 9 are processed at grazing occurs in connecting rod 4 and crank-pin 9 and cylinder 1.
As depicted in figs. 1 and 2, Fig. 1 is diagrammatic sectional view when crankshaft does not bias, at this point, cylinder centerline 10 and song
In the same plane, Fig. 2 is the diagrammatic sectional view of cylinder centerline 10 and crank position after crankshaft deviates 50 millimeters to shaft centre line,
At this point, the position of crankshaft center 5 becomes the position where offset crankshaft center 6.
As shown in Figure 3 and Figure 4, the angle of cylinder centerline 10 and crank 8 is crank angle 11, in piston pin 3 and crankshaft
The vertical range of the heart 5 is first vertically away from 12, and crankshaft biasing secondary piston pin 3 and the first vertical range 12 of crankshaft center 5 use sJust
It indicates, at this point,
After crankshaft biasing, piston pin 3 is second vertical away from 13 with the vertical range at offset crankshaft center 6, uses sPartiallyIt indicates, this
When,
It can be seen from formula in identical corner, 2 present position of piston is different.
As shown in Figure 5 and Figure 6, by 360 ° of crank angles 11 according to every 30 ° of one figure, for comparing in identical crank angle 11
When positive axis and off-axis engine 2 position of piston, compare from Fig. 5 and Fig. 6 as can be seen that the upper and lower stop of off-axis engine piston
It is not the upper and lower stop of crank-pin.
The shaft generator piston running position curve 14 as shown in fig. 7, dotted line is positive, solid line are the operation of off-axis engine piston
Position curve 15, in downlink and uplink stroke, off-axis engine piston speed is above positive shaft generator, faster piston fortune
Scanning frequency degree can be such that the bags expands quickly, can alleviate oil gas concentrated combustion formation highest detonation pressure and piston ring with
Cylinder relative velocity increases, and advantageously forms lubricating oil film, improves the lubrication of this friction of cylinder and piston ring pair, chooses 30 °
With 60 ° of two crank angles, 11 position, off-axis starts volume of cylinder to increase 3.8% and 8.2% respectively.And it is in crank angle 11
At 90 °, off-axis starts volume of cylinder to increase to 10.5%.In compression travel, when piston 2 is close to top dead centre, lateral force 0, this is right
In reduce resistance to compression pression and cylinder sleeve Upper wear be it is beneficial, the very fast downlink of piston 2 is conducive to air-breathing, increases air and injects cylinder
Inertia, very fast uplink be conducive to increase exhaust kinetic energy, improve supercharger speed.
As shown in figure 8, position when 2 top of piston is from crankshaft center maximum distance is piston top dead center 16,2 top of piston
Position when from crankshaft center minimum range is piston lower dead center 17, and crankshaft offset can increase engine strokes.For biasing
Crank engine:
Piston 2 is located at top dead centre, the maximum value of engine strokes
Piston 2 is located at lower dead center, the minimum value of engine strokes
Bring data calculated result, stroke 155.85mm into.Increase 3.9% than positive shaft generator.
As shown in Fig. 9, Figure 10, Figure 11 and Figure 12, when Fig. 9 and Figure 10 are 2 downlink working stroke of piston, to piston pin 3 with
The stress condition of crank-pin 9 is analyzed, Figure 11 and Figure 12 be on the piston 2 row compression travel when, to piston pin 3 and crank-pin 9
Stress condition analysis.The present embodiment, which does work to 2 downlink of piston, carries out detailed analysis, and the downward pressure that piston pin 3 is received is FP, can
It is decomposed into two component: along the connecting rod power F of connecting rod transmittingP1With the horizontal lateral force F to cylinder wallP2, connecting rod power FP1As driving
Power is transmitted to crank-pin 9, lateral force FP2Formed engine tilting moment and piston motion frictional resistance, piston pin 3 by
Under power and the angle of connecting rod power be ψ, the calculation formula of component are as follows:
According to above formula, the angle ψ increases, connecting rod power FP1With lateral force FP2Increase.Therefore, when 2 downlink of piston, off-axis starts
The connecting rod power F of machineP1With lateral force FP2It is all larger than positive shaft generator, lateral force FP2Increase is conducive to engine power output.
9 force analysis of crank-pin, connecting rod power FP1It is decomposed into the radial force R for being directed toward crankshaft main bearing again at crank-pin 9
The peripheral force S vertical with radial force, radial force R do not generate effect to crank rotation, and peripheral force S drives crankshaft operation.
When working stroke 2 downlink of piston, although lateral force FP2It is larger, but due to being capable of shape between cylinder wall and piston ring
At good fluid lubrication, coefficient of friction very little is 0.01~0.001, and frictional resistance will not obviously increase, and rush in compression
Journey, close to boundary lubrication between cylinder wall and piston ring, coefficient of friction is 0.5~0.05, is the decades of times of fluid lubrication, subtracts
Lateral force F during 2 uplink of small pistonP2Be conducive to engine operation, piston operation characteristic and this of off-axis engine are wanted
Ask identical.
Force analysis figure uses common scale, and the numerical value of each power can be indicated with the line segment for representing power in figure, convenient for comparing,
Compare and be listed as follows:
Data in summary analysis: the stress majority of off-axis engine is better than positive shaft generator, wherein obviously advantageously
The lateral force F of off-axis engine in compression travelP2Only positive axis engine lateral force F 'P20.3 times, not only reduce friction disappear
A possibility that consumption can also reduce scuffing of cylinder bore.
Claims (4)
1. a kind of offset crankshaft formula engine, including cylinder, piston, piston pin, connecting rod, crank and crank-pin；Piston is set to hair
In motivation cylinder, piston pin is set on piston, and connecting rod is linked together by piston pin and piston, and crank passes through crank-pin and company
Bar links together；Before crankshaft does not bias, crankshaft center line and cylinder centerline are in the same plane, which is characterized in that by crankshaft
Deviate certain distance to crank-pin down direction, using piston pin center as the center of circle, length of connecting rod and throw of crankshaft and be radius
Circular arc is done, the intersection point of straight line where circular arc and offset distance is the position at offset crankshaft center；Connecting rod and crank-pin and cylinder are sent out
The notch of evacuation connecting rod and crank-pin is machined at raw grazing.
2. offset crankshaft formula engine according to claim 1, which is characterized in that the type of engine is in-line four strokes
Trunk engine, cylinder type include formula arranged in a straight line and V-arrangement arranged type.
3. offset crankshaft formula engine according to claim 1, which is characterized in that engine selected parameter are as follows: cylinder
Cylinder diameter is 140 millimeters, and stroke is 150 millimeters, and throw of crankshaft is 75 millimeters, and length of connecting rod is 200 millimeters, and offset distance is 50 millis
Rice.
4. offset crankshaft formula engine according to claim 1, which is characterized in that crankshaft steering is clockwise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822210682.5U CN209278002U (en) | 2018-12-27 | 2018-12-27 | A kind of offset crankshaft formula engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822210682.5U CN209278002U (en) | 2018-12-27 | 2018-12-27 | A kind of offset crankshaft formula engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209278002U true CN209278002U (en) | 2019-08-20 |
Family
ID=67607673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822210682.5U Expired - Fee Related CN209278002U (en) | 2018-12-27 | 2018-12-27 | A kind of offset crankshaft formula engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209278002U (en) |
-
2018
- 2018-12-27 CN CN201822210682.5U patent/CN209278002U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190820 Termination date: 20191227 |
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| CF01 | Termination of patent right due to non-payment of annual fee |