CN108518279A - Improve the method for engine effective thermal efficiency and its power transmission mechanism of preparation - Google Patents
Improve the method for engine effective thermal efficiency and its power transmission mechanism of preparation Download PDFInfo
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- CN108518279A CN108518279A CN201810308941.XA CN201810308941A CN108518279A CN 108518279 A CN108518279 A CN 108518279A CN 201810308941 A CN201810308941 A CN 201810308941A CN 108518279 A CN108518279 A CN 108518279A
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- crank
- piston
- crankshaft
- connecting link
- bent axle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/32—Engines characterised by connections between pistons and main shafts and not specific to preceding main groups
Abstract
The invention discloses the power transmission mechanisms of the method and its preparation that improve engine effective thermal efficiency, the eccentricity of engine power transmission mechanism is set, eccentricity be crankshaft center line between piston rod and crank connecting link connecting pin axis at a distance from, piston rod is located at crank connecting link connecting pin above crankshaft center point, either eccentricity be crankshaft center line between smooth block upper pin and crank connecting link connecting pin axis at a distance from or eccentricity be crankshaft center line between piston and crank connecting link connecting pin axis at a distance from.Its power increase rate is big, saving oil, and exhaust contaminant is low；Power is high, and torque is big；Working stroke is accelerated, and burning and the raising of compression ratio are conducive to, and reduces thermal loss；Parts are few, and production cost is low；Length of connecting rod can be made to reduce, keep integrated model compact；Bent axle negative bias makes bent axle splashing lubricating oil be constantly being directed towards piston when rotating, and piston/cylinder lubricates, and machine oil radiates by force to piston, engine great work intensity service life length etc..
Description
Technical field
The present invention relates to engines, are a kind of power transmission machines for the method and its preparation improving engine effective thermal efficiency
Structure.
Background technology
Current published various engine power transmission mechanisms are by toggle and bent axle by piston
Reciprocating motion is converted into rotary motion, and bent axle is driven by piston rod and done work.It is divided into single axis and double-crankshaft in these structures
Structure is specifically also divided without biasing and have bias structure.Though the engine power transmission mechanism of these structures has their own advantages, it is not
Foot still has, such as：There is the lateral pressure of alternation, shadows between the piston and cylinder wall without biasing engine of single axle construction
The friction power loss of piston and cylinder inner room is rung, statistical data shows that this friction power loss accounts for 75% left side of engine mechanical loss
The right side, and the friction power loss of cylinder sleeve and piston ring accounts for the 50% of piston connecting bar system, therefore, is usually adopted to reduce side pressure of piston
With bent axle offset placement, however, by published technical solution it is found that offset crankshaft structure can be eliminated under normal circumstances starts
The lateral pressure of machine piston and cylinder wall reduces friction and vibrations, since those skilled in the art think that working stroke is revolved in bent axle
Gyration accounting is bigger, and acting is more, so, crankshaft connecting rod system only rotates acting with positive bias direction.But these positively biaseds
The engine power transmission mechanism that the mode of setting is arranged keeps the increase rate of engine effective thermal efficiency smaller.
Invention content
The object of the present invention is to provide it is a kind of raising engine effective thermal efficiency method and its preparation power transmission mechanism,
It can solve the deficiencies in the prior art.
The present invention to achieve the above object, using following technical scheme：A method of engine effective thermal efficiency is improved,
The eccentricity of engine power transmission mechanism is set, and eccentricity is between crankshaft center line and piston rod and crank connecting link connecting pin axis
Distance, it is crankshaft center line and smooth block that piston rod and crank connecting link connecting pin, which are located at crankshaft center point top or eccentricity,
Distance or eccentricity between upper pin and crank connecting link connecting pin axis are crankshaft center line and piston and crank connecting link connecting pin
Distance between axis；
Eccentric distance e is set and is more than throw of crankshaft R；
Two bent axles are arranged in a manner of negative bias；
The difference of crank link length L and throw of crankshaft R is set except the quotient of eccentric distance e is biasing mechanism coefficient；
Setting biasing mechanism coefficient is 0.60-0.98, and engine power transmission mechanism is provided with biasing mechanism coefficient.
The biasing mechanism coefficient is 0.60-0.95.
The biasing mechanism coefficient is 0.75-0.98.
The biasing mechanism coefficient is 0.6-0.75.
The biasing mechanism coefficient is 0.75-0.95.
A kind of power transmission mechanism prepared by the method for improving engine effective thermal efficiency, including cylinder, the interior installation of cylinder
Piston, piston are connect by connector with crank connecting link, and crank connecting link is connect by crank axle with crank, and crank connects with bent axle
Connect, bent axle be two, be arranged eccentricity, eccentricity be between crankshaft center line and piston rod and crank connecting link connecting pin axis away from
From piston rod is located above crankshaft center point with crank connecting link connecting pin or eccentricity is that crankshaft center line is sold on smooth block
Distance or eccentricity between axis and crank connecting link connecting pin axis are crankshaft center line and piston and crank connecting link connecting pin axis
Between distance, eccentricity be more than throw of crankshaft, the angular interval that working stroke crank turns over be less than 180 degree.
The further scheme is that piston 2 is installed in cylinder 1, and smooth block 15 is installed on piston, is installed on smooth block 15
First axis pin 3 and the second axis pin 14, the first axis pin 3 are connect with one end of the first crank connecting link 4, the first crank connecting link 4 it is another
End is connect by the first crank axle 6 with 7 one end of the first crank, and 7 other end of the first crank is connect with the first bent axle 8, the first bent axle
8 connected first synchromesh gears 5, the 4 connecting pin axis of axis and the first crank connecting link of the axis of the first bent axle 8 and the first axis pin 3
Between distance be eccentric distance e, eccentric distance e be more than the first crank 7 radius R, 13 one end of the second axis pin 14 and the second crank connecting link
Connection, 13 other end of the second crank connecting link are connect by the second crank axle 11 with 10 one end of the second crank, and the second crank 10 is another
End is connect with the second bent axle 9, and the second bent axle 9 is connected the second synchromesh gear 12, and the first synchromesh gear 5 and the second synchromesh gear 12 are nibbled
It closes, the first bent axle 8 rotates clockwise, and the second bent axle 10 is rotated counterclockwise by connected synchromesh gear.
The difference of the crank link length L and throw of crankshaft R is 0.6-0.98 except the quotient of eccentric distance e.
The difference of the crank link length L and throw of crankshaft R is 0.75-0.95 except the quotient of eccentric distance e.
The difference of the crank link length L and throw of crankshaft R is 0.75-0.98 except the quotient of eccentric distance e.
Present invention firstly provides a kind of method improving engine effective thermal efficiency, this method is limited to engine work(
With in the structure of double-crankshaft negative bias arrangement, biasing mechanism coefficient is preferred in rate transmission mechanism：0.60-0.98、0.75-0.95、
0.75-0.98 or 0.60-0.75.
Method of the present invention has exceeded those skilled in the art, and that biasing mechanism coefficient is arranged in negative bias mechanism is small
In or equal to 0.1 idea.Those skilled in the art are it has long been believed that negative bias knot in various engine power transmission mechanisms
Biasing coefficient in structure cannot be more than 0.1, and this idea is more in the bigger acting of crankshaft rotation angle accounting based on working stroke,
However, it is considered herein that when bent axle is with negative bias direction rotary work, the arm of force coefficient of engine acting is greatly improved, can be put
The biasing mechanism coefficient of de- negative bias mechanism is less than or equal to 0.1 constraint, therefore, the present invention set biasing mechanism coefficient as
0.60-0.98,0.75-0.95,0.75-0.98 or 0.60-0.75, these biasing mechanism coefficients can make the effective thermal effect of engine
Rate has a more substantial increase.
Negative bias Double-crank shaft bar linkage arm of force coefficient provided by the invention is ζR, F；
In I formulas：L is crank link length, and R is throw of crankshaft, and e is eccentricity,
α is crankshaft rotation angle.
By I formulas it is found that the size of arm of force coefficient depends on bent axle and negative bias and crank connecting link Impact direction, meanwhile, with
Eccentric distance e positive correlation, and it is related to crank link length L and throw of crankshaft R, therefore, the bias that setting bent axle negative bias is arranged
It can determine the geometric properties of Double-crank shaft bar linkage away from the variation of e, crank link length L and throw of crankshaft R, therefore, use σpzTable
Show that biasing mechanism coefficient is σpz=e/ (L-R), i.e.,：Biasing mechanism coefficient is that the difference of crank link length and throw of crankshaft R is removed partially
Quotient of the heart away from e.Biasing mechanism coefficient 0.60-0.98,0.75-0.95,0.75-0.98 or 0.60-0.75 situation is set as a result,
Under, increase the transimission power that engine power transmission mechanism can be improved in bent axle negative bias arm of force coefficient, that is, improving engine has
Imitate the thermal efficiency.
The characteristics of power transmission mechanism of the raising engine effective thermal efficiency provided with the method for the invention, also resides in：
Power increase rate is big, saving oil, and exhaust contaminant is low；Power is high, and torque is big；Working stroke is accelerated, and burning and pressure are conducive to
The raising of contracting ratio reduces thermal loss；Parts are few, and production cost is low；Length of connecting rod can be made to reduce, keep integrated model compact；
Bent axle negative bias makes bent axle splashing lubricating oil be constantly being directed towards piston when rotating, and piston/cylinder lubricates, and machine oil radiates by force to piston,
Engine great work intensity service life length etc..
Description of the drawings
Attached drawing 1 is negative bias double crankshaft connecting rod power transmission mechanism schematic diagram of the present invention；Attached drawing 2 is biasing mechanism
Crankshaft-link rod arm of force charts for finned heat when coefficient is 0.75；Attached drawing 3 be biasing mechanism coefficient be 0.95 when crankshaft-link rod power
Arm charts for finned heat；Attached drawing 4 is biasing mechanism coefficient when being 0.91 crankshaft-link rod negative bias reverse drawing, negative bias, positive bias and nothing
Offset operation mode respectively shaft work value with without biasing the ratio between working method shaft work value；Attached drawing 5 be biasing mechanism coefficient be 0.91 when
Positive bias and the P-V of negative bias reverse drawing power transmission mechanism engine scheme；Attached drawing 6 is that power experiment biasing mechanism coefficient is
0.60 crankshaft-link rod arm of force charts for finned heat.
Specific implementation mode
Compareing attached drawing, the present invention will be further described.
A kind of method improving engine effective thermal efficiency of the present invention, is arranged the inclined of engine power transmission mechanism
The heart away from, eccentricity be crankshaft center line between piston rod and crank connecting link connecting pin axis at a distance from, piston rod connects with crank connecting link
It is crankshaft center line and smooth block upper pin and crank connecting link connecting pin axis to connect end to be located at crankshaft center point top or eccentricity
Between distance or eccentricity be crankshaft center line between piston and crank connecting link connecting pin axis at a distance from；
Eccentric distance e is set and is more than throw of crankshaft R；
Two bent axles are arranged in a manner of negative bias；
The difference of crank link length L and throw of crankshaft R is set except the quotient of eccentric distance e is biasing mechanism coefficient；
Setting biasing mechanism coefficient is 0.60-0.98, and engine power transmission mechanism is provided with biasing mechanism coefficient.
The connection of piston and crank connecting link can be realized there are many mode in double-crankshaft negative bias arrangement of the present invention：①
Piston is connect with piston rod, and piston rod is connect with two crank connecting links respectively, the connecting pin position of piston rod and two crank connecting links
Above crankshaft center point, eccentricity be crankshaft center line between piston rod and crank connecting link connecting pin axis at a distance from；2. piston
Upper installation smooth block installs two axis pins on smooth block, and each axis pin is connect with respective crank connecting link respectively, at this point, eccentric
Away from be then crankshaft center line between smooth block upper pin and crank connecting link connecting pin axis at a distance from；3. piston directly respectively with two
Crank connecting link connect, at this point, eccentricity be then crankshaft center line between piston and crank connecting link connecting pin axis at a distance from.
The biasing mechanism coefficient is 0.60-0.95.
The biasing mechanism coefficient is 0.75-0.98.
The biasing mechanism coefficient is 0.6-0.75.
The biasing mechanism coefficient is 0.75-0.95.
Method of the present invention overcomes the prejudice of those skilled in the art for a long time.Present invention research is thought, carries
High arm of force coefficient maximum value is simultaneously close to the bent axle that maximum combustion pressure generates in double crankshaft connecting rod power transmission mechanism as possible
Corner can reach the efficiency of transmission for improving engine power transmission mechanism, that is, improve engine effective thermal efficiency.
Table 1：Biasing mechanism factor sigmapzWith bent axle difference bias mode arm of force coefficient maximum value ζR, maxCorresponding crankshaft rotation angle
Angle value θmaxChange table (λ=1/3.5, λ indicate connecting rod ratio)
By upper table data it is found that when biasing mechanism coefficient changes from small to big：1. bent axle positive bias arm of force index variation is little, and
Corresponding crank angle is gradually distance from top dead centre；2. bent axle negative bias arm of force coefficient increase rate is big, but corresponding crank angle is gradual
Far from top dead centre, when biasing mechanism coefficient increases since 0.4, arm of force coefficient increases gently, biasing mechanism coefficient from 0.6 again
Arm of force coefficient quickly increases when increasing upwards；3. 0.4 arm of force coefficient maximum value of biasing mechanism coefficient corresponds to crank angle 94.06
Degree deviates too far away from the maximum top dead centre of cylinder pressure, turns when 0.60 arm of force coefficient maximum value of biasing mechanism coefficient corresponds to bent axle
86.20 degree of angle, the corresponding crank angle variation of the arm of force coefficient maximum value increase of biasing mechanism coefficient increase later are also ideal.Institute
It is arranged as preferred arrangement with bent axle negative bias.
Currently preferred biasing mechanism coefficient be 0.6-0.98, further preferred 0.75-0.98,0.75-0.95 or
0.6-0.75.When biasing mechanism coefficient is 0.6-0.75, effect is better than 0.4-0.59.
Relationship between the biasing mechanism coefficient and power of engine power transmission mechanism of the present invention has large change.
Table 2 is that the power of two kinds of bias modes of twin crankshaft engine tests output data
Unit：W
σ in table 2pzBiasing mechanism coefficient, e- eccentricities, L- crank link lengths, R- throws of crankshaft, S- piston strokes.
As shown in Table 2, when biasing mechanism coefficient is 0.6-0.95, the engine power output mechanism of bent axle negative bias
Power is substantially higher than the power of the bent axle positive bias power output mechanism of the prior art.
L=9.4 centimetres of length of connecting rod, R=2.07 centimetres of throw of crankshaft, eccentric amount e=4.42 centimetre described in table 2, biasing
Mechanism factor sigmapz=0.6, connecting rod arm of force coefficient curve is referring to Fig. 6.Ratio is being just when measuring cylinder cap temperature negative bias working condition for experiment
It is low when offset operation state, it was demonstrated that thermal losses is small when negative bias working condition so that the thermal efficiency improves.
Bent axle negative bias of the present invention refers to the angle that the working stroke crank of engine power output mechanism turns over
Section is less than 180 degree, as shown in Figure 1.The referred to as bent axle positively biased when the angular interval that working stroke crank turns over is more than 180 degree
It sets.
Piston stroke S increases as biasing mechanism coefficient increases in table 2 so that engine displacement increases, the work(obtained
Rate value can not vertical analysis compare, it is necessary to eliminate piston stroke in proportion and increase influence to magnitude of power.With biasing mechanism system
When several 0.60,4.74 centimetres of piston stroke first finds out other biasing mechanism coefficients on the basis of traditional positive bias performance number 901W
The respective piston stroke of value increases ratio, then increases the product of ratio and reference power value (901w) with stroke, except respective tradition
Positive bias, negative bias performance number, it is power correction ratio to obtain quotient, that is, relative to the positively biased output effect of benchmark tradition
Rate.
Table 3：Ratio table is corrected in the power experiment of table 2
| σpz | S(cm) | Stroke increases ratio | Positive bias | Negative bias |
| 0.60 | 4.74 | 1.000 | 1.000 | 1.061 |
| 0.75 | 5.22 | 1.101 | 0.996 | 1.076 |
| 0.85 | 5.74 | 1.211 | 0.990 | 1.093 |
| 0.90 | 6.19 | 1.306 | 0.986 | 1.103 |
| 0.95 | 6.91 | 1.458 | 0.982 | 1.127 |
3 data of table show that the biasing mechanism coefficient and delivery efficiency of the power transmission mechanism are learnt in one column of traditional positive bias
It is negatively correlated.Learn biasing mechanism coefficient and the delivery efficiency positive correlation of the power transmission mechanism, delivery efficiency list in one column of negative bias
It adjusts and increases.Delivery efficiency reaches high point, delivery efficiency when biasing mechanism coefficient continues to increase to 0.95 when biasing mechanism coefficient 0.85
A high position is maintained to be declined slightly.
The engine effective thermal efficiency transmission mechanism that the method for the invention limits is Double-crank shaft bar linkage, such as Fig. 1 institutes
Show, the steering of the first bent axle 8 is clockwise, and the steering of the second bent axle 9 is counterclockwise, crankshaft center line and the second axis pin on piston
Eccentricity is set between center and crank connecting link connecting pin axis, and eccentric distance e is more than throw of crankshaft R.Two bent axle negative bias arrangements.
The shell of engine power transmission mechanism, cylinder and same as the prior art with the connection relation installation site of other components etc..
When crankshaft connecting rod system moves, eccentricity is center and the movement of crank connecting link connecting shaft of crankshaft center line and smooth block upper pin
The distance of center line, at a distance from eccentricity can also be crankshaft center line between piston and crank connecting link connecting shaft centre of motion line,
At a distance from eccentricity can also be crankshaft center line between piston rod and crank connecting link connecting shaft centre of motion line, piston rod and crank
Connecting rod connecting pin is located above crankshaft center point.
Each component locations of the present invention are shown position.
The applicable engine power transmission mechanism embodiment as shown in Figure 1 of the method for the invention, but the present invention is not limited to
Embodiment.Since the connection of the components structures to that indicated in the drawings such as shell, cylinder in transmission mechanism is known technology, therefore Fig. 1
Shown is Double-crank shaft bar linkage schematic diagram.
Embodiment is that the double-crankshaft negative bias of raising engine effective thermal efficiency power transmission mechanism is arranged as shown in Figure 1
Link mechanism, in negative bias structure shown in Fig. 1, the connection of piston and crank connecting link is axis pin by smooth block and thereon
It realizes, this is one of preferred embodiment.The structure that piston is connect with crank connecting link can also be：Piston connects with two cranks respectively
Piston rod is connected on one end connection of bar or piston, the other end of piston rod is connect with two crank connecting links respectively, piston rod
It is located above two crankshaft center points with two crank connecting link connecting pins.
1 is cylinder in Fig. 1, and piston 2 is installed in cylinder 1, and smooth block 15 is installed on piston, the first pin is installed on smooth block 15
Axis 3 and the second axis pin 14, the first axis pin 3 are connect with one end of the first crank connecting link 4, and the other end of the first crank connecting link 4 passes through
First crank axle 6 is connect with 7 one end of the first crank, and 7 other end of the first crank is connect with the first bent axle 8, and the first bent axle 8 is connected
First synchromesh gear 5, between the 4 connecting pin axis of axis and the first crank connecting link of the axis of the first bent axle 8 and the first axis pin 3 away from
From for eccentric distance e, eccentric distance e is more than the radius R of the first crank 7, and the second axis pin 14 is connect with 13 one end of the second crank connecting link, the
Two crank connecting links, 13 other end is connect by the second crank axle 11 with 10 one end of the second crank, 10 other end of the second crank and second
Bent axle 9 connects, and the second bent axle 9 is connected second synchromesh gear 12, and the first synchromesh gear 5 and the second synchromesh gear 12 engage, and first
Bent axle 8 rotates clockwise, and the second bent axle 10 is rotated counterclockwise by connected synchromesh gear.The crankshaft-link rod machine of second bent axle 9
Structure is using 2 centre of motion line of piston as the crankshaft connecting rod system symmetric motion of plane and the first bent axle 8.Working stroke crank turns over
Angular interval is less than 180 degree.First crank, 7 vertical line position f is 0 degree of starting point, and the angle between the first crank 7 and the starting point is
A, the angle between the first axis pin axis on the first crank connecting link 4 and piston is β.
Power transmission mechanism prepared by a kind of method improving engine effective thermal efficiency of the present invention, including gas
Cylinder, cylinder is interior to install piston, and piston is connect by connector with crank connecting link, and crank connecting link is connect by crank axle with crank,
Crank is connect with bent axle, and bent axle is two, eccentricity is arranged, eccentricity is crankshaft center line and piston rod and crank connecting link connecting pin
Distance between axis, piston rod and crank connecting link connecting pin be located above crankshaft center point or eccentricity be crankshaft center line and
Distance or eccentricity between smooth block upper pin and crank connecting link connecting pin axis are crankshaft center line and piston and crank connecting link
Distance between the axis of connecting pin, eccentricity are more than throw of crankshaft, and the angular interval that working stroke crank turns over is less than 180 degree.When
When crankshaft connecting rod system moves, eccentricity is in the center and the movement of crank connecting link connecting shaft of crankshaft center line and smooth block upper pin
The distance of heart line, at a distance from eccentricity can also be crankshaft center line between piston and crank connecting link connecting shaft centre of motion line, partially
The heart away from can also be crankshaft center line between piston rod and crank connecting link connecting shaft centre of motion line at a distance from, piston rod and crank connect
Bar connecting pin is located above crankshaft center point.
The further preferred embodiment of the present invention is：Piston 2 is installed in cylinder 1, smooth block 15, smooth block 15 are installed on piston
The first axis pin 3 of upper installation and the second axis pin 14, the first axis pin 3 are connect with one end of the first crank connecting link 4, the first crank connecting link 4
The other end connect with 7 one end of the first crank by the first crank axle 6,7 other end of the first crank is connect with the first bent axle 8,
One bent axle 8 is connected the first synchromesh gear 5, and eccentric distance e is more than the radius R of the first crank 7, the second axis pin 14 and the second crank connecting link
13 one end connect, and 13 other end of the second crank connecting link is connect by the second crank axle 11 with 10 one end of the second crank, the second crank
10 other ends are connect with the second bent axle 9, and the second bent axle 9 is connected the second synchromesh gear 12, and the first synchromesh gear 5 is synchronous with second
Gear 12 engages, and the first bent axle 8 rotates clockwise, and the second bent axle 10 is rotated counterclockwise by connected synchromesh gear.Second is bent
The crankshaft connecting rod system of axis 9 is using 2 centre of motion line of piston as the crankshaft connecting rod system symmetric motion of plane and the first bent axle 8.
Between 4 connecting pin axis of the axis of first bent axle 8 and the center of the first axis pin 3 and the first crank connecting link
Distance is that eccentric distance e is as shown in Figure 1.
The difference of the crank link length L and throw of crankshaft R is 0.75-0.95 except the quotient of eccentric distance e.
The difference of the crank link length L and throw of crankshaft R is 0.6-0.98 except the quotient of eccentric distance e.
The difference of the crank link length L and throw of crankshaft R is 0.75-0.98 except the quotient of eccentric distance e.
The difference of the crank link length L and throw of crankshaft R is 0.6-0.75 except the quotient of eccentric distance e.
Effect in said program is explained with table 1 of the present invention, table 2 and table 3, the curve shown in attached drawing 2-6
It further illustrates.In table and biasing mechanism factor sigma shown in figurepzIt is crank link length L with the difference of throw of crankshaft R except inclined
Quotient of the heart away from e.
The shell of engine power transmission mechanism of the present invention, the structure of cylinder, piston, connecting rod, crank and bent axle
Shaped position relationship is identical as known technology.
The crank link length L and the difference of throw of crankshaft R that the present invention is set when preparing engine power transmission mechanism are removed
The quotient of eccentric distance e is biasing mechanism coefficient, and the precondition of setting biasing mechanism coefficient is that eccentricity is more than throw of crankshaft.Biasing
Mechanism coefficient is 0.6-0.98, preferably 0.60-0.95,0.75-0.98,0.75-0.95 or 0.6-0.75, above-mentioned biasing mechanism
The power of engine double crankshaft connecting rod power output mechanism can be improved in coefficient, and biasing mechanism coefficient range of the present invention is any
Value can improve the power of engine power transmission mechanism, such as：Biasing mechanism coefficient be 0.6,0.62,0.65,0.68,
0.70,0.73,0.75,0.78,0.80,0.83,0.85,0.88,0.90,0.93,0.95 or 0.98 etc., wherein when biasing machine
Structure factor sigmapzWhen being set as 0.98, e 7.2cm, R/L 0.22, S 7.55cm, the engine work(of double-crankshaft negative bias arrangement
The power of rate transmission mechanism is 1505, and the power of the engine power transmission mechanism of the positive bias arrangement of the prior art is 1282.
Experiment condition such as table 2 is identical, corrects ratio principle with table 3, wherein stroke variation is 1.593, and negative bias output power is
1.174。
Conventional crankshafts are 2R without biasing piston stroke in curve shown in Fig. 2, and piston stroke Se increases after bent axle biasing, two
It should be converted by scaling up when person's arm of force coefficients comparison, the arm of force coefficient of bent axle biasing is converted toWork as σpzWhen=0.75,
Using common connecting rod ratio(abbreviation negative bias is anti-in figure for the arm of force coefficient curve of negative bias double-crankshaft reverse drawing link mechanism
Draw) and negative bias Double-crank shaft bar linkage arm of force coefficient curve (abbreviation negative bias in figure) with tradition without biasing single axis company
Linkage arm of force coefficient curve is compared, and arm of force coefficient curve maximum value is higher by 0.18, and 78 ° away from top dead centre bent axles turn when maximum value
Angle, at this time negative bias reverse drawing almost overlapped with the arm of force coefficient curve of both negative bias, σpz=0.75 be negative bias reverse drawing with it is negative
Bias the similar critical point of arm of force coefficient curve of the two.
Conventional crankshafts are 2R without biasing piston stroke in attached curve graph shown in Fig. 3, and piston stroke Se increases after bent axle biasing
Greatly, it should be converted by scaling up when the two arm of force coefficients comparison, the arm of force coefficient of bent axle biasing is converted toWork as σpz=
When 0.95, using common connecting rod ratioThe arm of force coefficient curve of negative bias double-crankshaft reverse drawing link mechanism is (in Fig. 3 referred to as：
Negative bias reverse drawing), the arm of force coefficient curve of negative bias Double-crank shaft bar linkage (in Fig. 3 referred to as：Negative bias) and it is traditional without biasing
Single crankshaft connecting rod system arm of force coefficient curve is (in Fig. 3 referred to as：Without biasing) it compares, arm of force coefficient curve maximum value is higher by 0.29,
Especially at this time the arm of force coefficient curve maximum value of negative bias reverse drawing when crank angle Forward, move forward to 51 ° away from top dead centre songs
Shaft angle；Conventional crankshafts are 2R without biasing piston stroke in attached drawing 2, attached drawing 3, and piston stroke Se increases after bent axle biasing, the two
It should be converted by scaling up when arm of force coefficients comparison.
The ratio between attached shaft work value shown in Fig. 4 (is not included in Double-crank shaft bar linkage and reduces friction raising mechanical efficiency part),
Since negative bias reverse drawing, negative bias are different from positive bias working method arm of force coefficient maximum value, negative bias reverse drawing, the negative bias arm of force
The crank shaft angle angle value that coefficient maximum value occurs is different so that positive bias, negative bias, negative bias reverse drawing working method shaft work successively
It improves, σpz=0.91 negative bias reverse drawing shaft work is 1.16 times or so without biasing working method shaft work.
Attached P-V figures shown in fig. 5, are to use internal combustion engine traditional theory, and Engineering Thermodynamics statement is to recycle work(made by piston
For:wo=∫ PgDv, the done expansion of piston and gas pressure P when engine is workedgCycle indicated horsepower figure (P-V figures) is drawn,
Engine negative bias working method as seen from the figure, hence it is evident that be higher than positive bias working method.
Claims (10)
1. a kind of method improving engine effective thermal efficiency, it is characterised in that：The bias of engine power transmission mechanism is set
Away from, eccentricity be crankshaft center line between piston rod and crank connecting link connecting pin axis at a distance from, piston rod is connect with crank connecting link
End is located above crankshaft center point or eccentricity is between crankshaft center line and smooth block upper pin and crank connecting link connecting pin axis
Distance or eccentricity be crankshaft center line between piston and crank connecting link connecting pin axis at a distance from；
Eccentric distance e is set and is more than throw of crankshaft R；
Two bent axles are arranged in a manner of negative bias；
The difference of crank link length L and throw of crankshaft R is set except the quotient of eccentric distance e is biasing mechanism coefficient；
Setting biasing mechanism coefficient is 0.60-0.98, and engine power transmission mechanism is provided with biasing mechanism coefficient.
2. a kind of method improving engine effective thermal efficiency according to claim 1, it is characterised in that：The biasing
Mechanism coefficient is 0.75-0.98.
3. a kind of method improving engine effective thermal efficiency according to claim 1, it is characterised in that：The biasing
Mechanism coefficient is 0.60-0.95.
4. a kind of method improving engine effective thermal efficiency according to claim 1, it is characterised in that：The biasing
Mechanism coefficient is 0.6-0.75.
5. a kind of method improving engine effective thermal efficiency according to claim 1, it is characterised in that：The biasing
Mechanism coefficient is 0.75-0.95.
6. power transmission mechanism prepared by a kind of method of raising engine effective thermal efficiency according to claim 1-5,
It is characterized in that：Including cylinder, piston is installed in cylinder, piston is connect by connector with crank connecting link, and crank connecting link passes through
Crank axle is connect with crank, and crank is connect with bent axle, and bent axle is two, eccentricity is arranged, eccentricity is crankshaft center line and piston
Distance between bar and crank connecting link connecting pin axis, piston rod are located at crank connecting link connecting pin above crankshaft center point, or
Eccentricity be crankshaft center line between smooth block upper pin and crank connecting link connecting pin axis at a distance from or eccentricity be bent axle axis
Line between piston and crank connecting link connecting pin axis at a distance from, eccentricity be more than throw of crankshaft, the angle that working stroke crank turns over
It spends section and is less than 180 degree.
7. power transmission mechanism prepared by a kind of method improving engine effective thermal efficiency according to claim 6,
It is characterized in that：Piston 2 is installed in cylinder 1, smooth block 15 is installed on piston, the first axis pin 3 and second pin is installed on smooth block 15
Axis 14, the first axis pin 3 are connect with one end of the first crank connecting link 4, and the other end of the first crank connecting link 4 passes through the first crank axle 6
It is connect with 7 one end of the first crank, 7 other end of the first crank is connect with the first bent axle 8, and the first bent axle 8 is connected the first synchromesh gear
5, the axis of the first bent axle 8 between 4 connecting pin axis of the center of the first axis pin 3 and the first crank connecting link at a distance from be eccentric distance e,
Eccentric distance e is more than the radius R of the first crank 7, and the second axis pin 14 is connect with 13 one end of the second crank connecting link, the second crank connecting link 13
The other end is connect by the second crank axle 11 with 10 one end of the second crank, and 10 other end of the second crank is connect with the second bent axle 9, the
Two bent axles 9 are connected the second synchromesh gear 12, and the first synchromesh gear 5 and the engagement of the second synchromesh gear 12, the first bent axle 8 turn clockwise
Dynamic, the second bent axle 10 is rotated counterclockwise by connected synchromesh gear.
8. power transmission mechanism prepared by a kind of method of raising engine effective thermal efficiency described according to claim 6 or 7,
It is characterized in that：The difference of crank link length L and throw of crankshaft R is 0.6-0.98 except the quotient of eccentric distance e.
9. power transmission mechanism prepared by a kind of method of raising engine effective thermal efficiency described according to claim 6 or 7,
It is characterized in that：The difference of crank link length L and throw of crankshaft R is 0.75-0.95 except the quotient of eccentric distance e.
10. power transmission machine prepared by a kind of method of raising engine effective thermal efficiency described according to claim 6 or 7
Structure, it is characterised in that：The difference of crank link length L and throw of crankshaft R is 0.75-0.98 except the quotient of eccentric distance e.
Priority Applications (2)
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| CN201810308941.XA CN108518279B (en) | 2017-04-05 | 2018-04-04 | Improve the method for engine effective thermal efficiency and its power transmission mechanism of preparation |
| PCT/CN2019/077661 WO2019192288A1 (en) | 2018-04-04 | 2019-03-11 | Method for improving effective thermal efficiency of engine and power transmission mechanism prepared thereby |
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| CN2017203491428 | 2017-04-05 | ||
| CN201720349142 | 2017-04-05 | ||
| CN201810308941.XA CN108518279B (en) | 2017-04-05 | 2018-04-04 | Improve the method for engine effective thermal efficiency and its power transmission mechanism of preparation |
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| CN108518279B CN108518279B (en) | 2019-11-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019192289A1 (en) * | 2018-04-04 | 2019-10-10 | 张佰力 | Method for improving effective thermal efficiency of engine and power transmission mechanism prepared by means of same |
| WO2019192288A1 (en) * | 2018-04-04 | 2019-10-10 | 张佰力 | Method for improving effective thermal efficiency of engine and power transmission mechanism prepared thereby |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108561225B (en) * | 2017-04-05 | 2020-11-24 | 张佰力 | Method for improving effective thermal efficiency of engine and power transmission mechanism prepared by method |
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| WO2019192289A1 (en) * | 2018-04-04 | 2019-10-10 | 张佰力 | Method for improving effective thermal efficiency of engine and power transmission mechanism prepared by means of same |
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| CN108518279B (en) | 2019-11-19 |
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