CN109252953A - Variable compression ratio engine length can be changed link mechanism - Google Patents
Variable compression ratio engine length can be changed link mechanism Download PDFInfo
- Publication number
- CN109252953A CN109252953A CN201811440363.1A CN201811440363A CN109252953A CN 109252953 A CN109252953 A CN 109252953A CN 201811440363 A CN201811440363 A CN 201811440363A CN 109252953 A CN109252953 A CN 109252953A
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- Prior art keywords
- adjusting block
- connecting rod
- compression ratio
- adjusting
- connect
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000007246 mechanism Effects 0.000 title claims abstract description 44
- 230000006835 compression Effects 0.000 title claims abstract description 40
- 238000007906 compression Methods 0.000 title claims abstract description 40
- 230000033001 locomotion Effects 0.000 claims abstract description 9
- 208000004141 microcephaly Diseases 0.000 claims description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 230000008859 change Effects 0.000 description 9
- 239000000446 fuel Substances 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 5
- 239000003345 natural gas Substances 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008450 motivation Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000005194 fractionation Methods 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003380 propellant Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
- F02B75/045—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable connecting rod length
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
- F16C7/06—Adjustable connecting-rods
Abstract
The present invention relates to a kind of variable compression ratio engine length can be changed link mechanism, including small end of connecting rod and big end, the upper end of small end of connecting rod are connect with piston, and the lower end of big end is connect with crankshaft；It is characterized in that: the first adjusting block and the second adjusting block are arranged between the small end of connecting rod and big end, the upper end of first adjusting block and the second adjusting block passes through first connecting rod and the second connecting rod respectively and small end of connecting rod is hinged, the lower end of the first adjusting block and the second adjusting block pass through respectively third connecting rod and the 4th connecting rod with to connect major part hinged；Setting is adjusted between first adjusting block and the second adjusting block and lockable mechanism, adjusting and lockable mechanism can drive the first adjusting block and the second adjusting block to carry out relatively close or separate movement.The present invention can satisfy demand of the different purposes engines to compression ratio, and structure is simple, easy to control, good reliability, at low cost.
Description
Technical field
The present invention relates to a kind of crank-connecting rod mechanism for engine, especially a kind of variable compression ratio engine length is variable to be connected
Linkage belongs to technical field of engines.
Background technique
Variable compression ratio (VCR) technology can be rated as the last time revolution of engine variable technology, to the shadow of engine performance
Sound is larger, and the fuel consumption of engine can be greatly reduced, and improves emission level.For passenger vehicle engine, Smaller load
Using big compression ratio, big load can reduce fuel consumption using small reduction ratio；For commercial vehicle, sub-load is suitably mentioned
High compression ratio can reduce fuel consumption, and big load reduction compression ratio can be substantially reduced NOxEqual hazardous emissions are horizontal, thus
The requirement to after-treatment device is reduced, cost is reduced.Changeable compression ratio technique comes natural gas and Diesel Dual-Fuel Engine
It says with more application value, pinking can be reduced with low compression ratio when using natural gas, improve maximum power, when using diesel oil
The thermal efficiency is improved with high compression ratio and maximum power, the market demand are very urgent.At present in variable compression ratio (VCR) technical field
It studies more, also applies for many patents, but due to the influence of the factors such as structure, control, reliability, almost without volume production
Example applied to engine.
Current existing changeable compression ratio technique can be divided into several classes: depth pistion is variable, length of connecting rod is variable, crank position
Variable, cylinder cap cylinder body relative displacement, additional combustion room, valve actuating mechanism, tooth-like lever, multi-connecting-rod mechanism etc..
Wherein variable can be changed with length of connecting rod of depth pistion is the smallest to the structural modification of conventional engines；Additional combustion
The scheme of room has significant impact to combustion-chamber shape, to deteriorate air motion and burning；Crank position variation and cylinder body and
The driving device of the relative displacement two schemes of cylinder cap requires very big power output to realize the variation of position, to increase
Engine burden, and original machine change very greatly or is needed to redesign；Multi-connecting-rod mechanism and tooth-like lever can be preferable
Realize continuous variable and higher job stability, but structure is extremely complex, moving inertial mass is very big, to conventional types
It is not applicable, it needs to redesign engine.
Length of connecting rod can be changed based on again eccentric with small end of connecting rod class, big end bias or base bearing bias, change connecting rod
Effective length.
CN201480049952.0 discloses a kind of variable connecting rod of length of internal combustion engine, the connecting rod it is small
Effective length between connecting rod stomidium and big connecting rod stomidium can be by means of the eccentric part on the small connecting rod stomidium
To be arranged.Here, bringing the particularly compact of the eccentric part and operation by means of rack pinion driver and double acting hydraulic cylinder
Reliable locking.Program principle is to change connecting rod effective length by small end of connecting rod bias.
US 8851030B2 provides a kind of variable compression ratio connecting rod, changes length of connecting rod by big end bias.
CN200910043200.4 provides a kind of variable compression ratio device of automobile engine, including crankshaft, master connecting-rod, work
By piston pin connection, master connecting-rod is big for plug, eccentric bush, hinge rod piece transmission mechanism and adjustment axis, master connecting-rod microcephaly and piston
Head is connect with crankshaft, and eccentric bush is arranged between master connecting-rod microcephaly and piston pin or is arranged in connecting rod neck and master connecting-rod major part
Between or be arranged between the trunnion of crankshaft and the base bearing bore of crankcase, between adjustment axis and eccentric bush using hinge
Chain rod piece transmission mechanism is driven.The rotation of hinge rod piece transmission mechanism control eccentric bush, can be changed piston top dead center position
Change engine compression ratio, and the hinge rod piece transmission mechanism is two parallelogram four-bar linkages.
CN 201391367Y discloses a kind of mechanism of changeable engine compression ratio, including cylinder body, piston, connecting rod, company
Spindle, it is characterised in that: the intracorporal each piston of the cylinder passes through connecting rod respectively and connect with crankshaft, and branch is equipped with by each connecting rod
Brace passes through crankshaft, and one end of support arm is connect with cylinder body hinge, and the other end is connected with pivot hinge is connect, due to using above-mentioned knot
Structure, the structural establishment have the advantage that 1, change engine compression ratio according to different working condition requirements, reduction fuel consumption,
It improves engine performance and reduces discharge；2, to traditional combustion mode change it is small, control mechanism adjusting force is small, can significantly adjust
Its compression ratio, the frictional force for only increasing this pair of wheel transmission, can be used to the manufacturing of new machine, it can also be used to older models
Transformation.
CN 106958488A discloses a kind of variable compression ratio engine, comprising: crank box；Multiple groups can be changed crankshaft, crankshaft
Arm regulating device comprising: shaft is rotatably supported in the crank box, and described shaft one end has locking device；It is more
A gear is fixed in the shaft, and the gear is engaged with the carousel gear, is able to drive the carousel gear
Rotation, i.e., engine crankshaft arm lengths are variable, and the length by changing crank arm can change the compression ratio of engine, from
And effectively improve the dynamic property and economy of engine.
Prior art small end of connecting rod bias scheme on a diesel engine difficulty in arrangement (diesel engine connecting bar microcephaly with piston it
Between gap it is small), diesel engine explosion pressure is big, and there are problems for structural strength and durable reliability.Existing patent is substantially
Principle can not be converted into product.Big end bias scheme will increase big end diameter, and arrangement space is tight in primary motivation
, the versatility with original machine is not strong.In addition big end, which is generally required, dismantles installation connecting rod cap, and eccentric wheel needs to be split as two
Part controls difficulty and increases after fractionation, whole eccentric wheel can not be mounted on crankshaft.Structure is complicated for multi-connecting-rod mechanism, is sending out
Stability is bad when motivation revolving speed is high, larger to the change of original machine, needs additionally to arrange a whole set of mechanism.
Summary of the invention
The purpose of the present invention is overcoming the deficiencies in the prior art, providing a kind of variable compression ratio engine length can
Become link mechanism, meets the needs of different purposes engines are to compression ratio, structure is simple, easy to control, good reliability, cost
It is low.
According to technical solution provided by the invention, the variable compression ratio engine length can be changed link mechanism, including even
The upper end of bar microcephaly and big end, small end of connecting rod is connect with piston, and the lower end of big end is connect with crankshaft；It is characterized in that:
First adjusting block and the second adjusting block, the first adjusting block and the second adjusting block are set between the small end of connecting rod and big end
Upper end pass through first connecting rod and the second connecting rod respectively and small end of connecting rod is hinged, under the first adjusting block and the second adjusting block
End respectively by third connecting rod and the 4th connecting rod with to connect major part hinged；First adjusting block and the second adjusting block it
Between setting adjust and lockable mechanism, it is relatively close that adjusting and lockable mechanism can drive the first adjusting block and the second adjusting block to carry out
Or separate movement.
Further, the adjusting and lockable mechanism use bolt arrangement, and bolt is adjusted with the first adjusting block and second respectively
Two sections of reverse threads are arranged by being threadedly engaged in locking nub on bolt, two sections of reverse threads respectively with the first adjusting block and second
Adjusting block is threadedly engaged, and one end of bolt is control terminal.
Further, the control terminal of the bolt is connect with electric control mechanism, driving bolt rotation.
Further, the adjusting and lockable mechanism use hydraulic structure, and two output ends of hydraulic structure are separately connected
First adjusting block and the second adjusting block, to control the first adjusting block and the second adjusting block towards or away from movement.
The invention has the following advantages that
(1) adjusting and lockable mechanism that the present invention uses can be manually adjusted or be automatically adjusted, easy to adjust；
(2) length of connecting rod longest of the present invention position and when most short position are rigid connection, and structural rigidity is good；
(3) present invention uses more hinge engaging structures, and parts machining is simple, intensity and high reliablity；
(4) the configuration of the present invention is simple, amount of parts is few, at low cost；
(5) present invention can be used for gasoline engine, diesel engine, gaseous propellant engine, dual fuel engine etc..
Detailed description of the invention
Fig. 1 is the schematic diagram of connecting rod longest (high compression ratio) state.
Fig. 2 is the schematic diagram of most short (low compression ratio) state of connecting rod.
Fig. 3 is the schematic diagram of each part stress of connecting rod longest (high compression ratio) state connecting rod.
Fig. 4 is the schematic diagram of each part stress of most short (low compression ratio) the state connecting rod of connecting rod.
Description of symbols: 1- small end of connecting rod, 21- first connecting rod, the second connecting rod of 22-, 23- third connecting rod, 24-
4th connecting rod, 3- is adjusted and lockable mechanism, the first adjusting block of 41-, the second adjusting block of 42-, 5- big end.
Specific embodiment
Below with reference to specific attached drawing, the invention will be further described.
As shown in Figure 1 and Figure 2, it includes small end of connecting rod 1 that variable compression ratio engine length of the present invention, which can be changed link mechanism,
It is connect with the upper end of big end 5, small end of connecting rod 1 with piston, the lower end of big end 5 is connect with crankshaft, in 1 He of small end of connecting rod
First adjusting block 41 and the second adjusting block 42, the upper end of the first adjusting block 41 and the second adjusting block 42 are set between big end 5
It is hinged by first connecting rod 21 and the second connecting rod 22 and small end of connecting rod 1 respectively, the first adjusting block 41 and the second adjusting block 42
Lower end pass through respectively third connecting rod 23 and the 4th connecting rod 24 with to connect major part 5 hinged；In 41 He of the first adjusting block
Setting is adjusted between second adjusting block 42 and lockable mechanism 3, adjusting and lockable mechanism 3 can drive the first adjusting block 41 and second
Adjusting block 42 carries out relatively close or separate movement, to realize the length between the small appropriate authorities 1 of connecting rod and big end 5
Variation, to change the compression ratio of engine.
Specifically, the adjusting and lockable mechanism 3 can use bolt arrangement, bolt respectively with the first adjusting block 41 and the
Two sections of reverse threads are arranged by being threadedly engaged in two adjusting blocks 42 on bolt, two sections of reverse threads respectively with the first adjusting block
41 and second adjusting block 42 be threadedly engaged, one end of bolt is control terminal, and control terminal can manually control or and Electronic control
Mechanism connection, driving bolt rotation, to realize the relative movement of the first adjusting block 41 and the second adjusting block 42.
As another embodiment of the invention, the adjusting and lockable mechanism 3 can use hydraulic structure, lead to
Hydraulic control the first adjusting block 41 and the second adjusting block 43 are crossed towards or away from movement.
The specific implementation that variable compression ratio engine length of the present invention can be changed link mechanism is as follows: such as Fig. 3 institute
Show, when the first adjusting block 41 and the second adjusting block 42 are in state close to each other, first connecting rod 21, the second connecting rod
22, third connecting rod 23 and the 4th connecting rod 24 are in vertical position, at this time first connecting rod 21, the second connecting rod 22,
Pulling force suffered by three connecting rods 23 and the 4th connecting rod 24, pressure from small end of connecting rod 1 by connecting rod, that adjusting block reaches connecting rod is big
First 5, so that crankshaft be pushed to rotate, small end of connecting rod 1, connecting rod, adjusting block, the connection between big end 5 are that rigidity connects at this time
It connects.
When the first adjusting block 41 and the second adjusting block 42 move round about under adjusting and the driving of lockable mechanism 3
Afterwards, when the first adjusting block 41 and the second adjusting block 42 are in the state being located remotely from each other, as shown in figure 4, first connecting rod 21, second
Connecting rod 22, third connecting rod 23 and the 4th connecting rod 24 are in obliquity, and when the state lower link is by pressure, connecting rod is small
First 1, adjusting block, big end 5 are in impaction state, and to be rigidly connected, pressure suffered by connecting rod passes through adjusting from small end of connecting rod 1
Block is transmitted to big end 5, then pushes crankshaft to rotate again.
Variable compression ratio engine length of the present invention can be changed link mechanism and start applied to Natural Gas & Diesel Dual Fuel Engine
On machine, can satisfy requirement of the different fuel to engine compression ratio, when using natural gas with low compression ratio can reduce pinking,
Maximum power is improved, improves the thermal efficiency and maximum power with high compression ratio when using diesel oil.To meet market to natural gas/bavin
The urgent need of oily dual fuel engine.
Claims (4)
1. a kind of variable compression ratio engine length can be changed link mechanism, including small end of connecting rod (1) and big end (5), connecting rod
The upper end of microcephaly (1) is connect with piston, and the lower end of big end (5) is connect with crankshaft；It is characterized in that: in the small end of connecting rod
(1) the first adjusting block (41) and the second adjusting block (42) are set between big end (5), and the first adjusting block (41) and second are adjusted
The upper end of locking nub (42) passes through first connecting rod (21) and the second connecting rod (22) and small end of connecting rod (1) hingedly respectively, and first adjusts
The lower end of locking nub (41) and the second adjusting block (42) pass through respectively third connecting rod (23) and the 4th connecting rod (24) with connect it is big
Head (5) is hinged；Setting adjusting and lockable mechanism (3), are adjusted between first adjusting block (41) and the second adjusting block (42)
And lockable mechanism (3) can drive the first adjusting block (41) and the second adjusting block (42) to carry out relatively close or separate movement.
2. variable compression ratio engine length as described in claim 1 can be changed link mechanism, it is characterized in that: the adjusting and lock
Locking mechanism (3) uses bolt arrangement, and bolt is respectively with the first adjusting block (41) and the second adjusting block (42) by being threadedly engaged, spiral shell
Two sections of reverse threads are set on bolt, which matches with the first adjusting block (41) and the second adjusting block (42) screw thread respectively
It closes, one end of bolt is control terminal.
3. variable compression ratio engine length as claimed in claim 2 can be changed link mechanism, it is characterized in that: the control of the bolt
End processed is connect with electric control mechanism, driving bolt rotation.
4. variable compression ratio engine length as described in claim 1 can be changed link mechanism, it is characterized in that: the adjusting and lock
Locking mechanism (3) uses hydraulic structure, and two output ends of hydraulic structure are separately connected the first adjusting block (41) and the second adjusting block
(42), to control the first adjusting block (41) and the second adjusting block (43) towards or away from movement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811440363.1A CN109252953B (en) | 2018-11-29 | 2018-11-29 | Variable compression ratio engine length variable link mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811440363.1A CN109252953B (en) | 2018-11-29 | 2018-11-29 | Variable compression ratio engine length variable link mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109252953A true CN109252953A (en) | 2019-01-22 |
| CN109252953B CN109252953B (en) | 2021-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811440363.1A Expired - Fee Related CN109252953B (en) | 2018-11-29 | 2018-11-29 | Variable compression ratio engine length variable link mechanism |
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| Country | Link |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109854369A (en) * | 2019-03-01 | 2019-06-07 | 一汽解放汽车有限公司 | A kind of dovetail groove type motor length can be changed link mechanism and its adjusting method |
| CN109854368A (en) * | 2019-02-28 | 2019-06-07 | 一汽解放汽车有限公司 | A kind of compression ratio two-stage variable link mechanism and its adjusting method |
| CN110608095A (en) * | 2019-09-06 | 2019-12-24 | 吉林大学 | Electrically-driven double-thread variable-length connecting rod variable compression ratio mechanism |
| CN112855357A (en) * | 2021-01-24 | 2021-05-28 | 效俊林 | Variable piston stroke and variable compression ratio mechanism of internal combustion engine and control method |
| CN113819713A (en) * | 2021-09-23 | 2021-12-21 | 南宫市精强连杆有限公司 | Air cooling device for connecting rod |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5277155A (en) * | 1990-02-12 | 1994-01-11 | Louis Paquola | System for achieving four-stroke cycle in an internal combustion engine with a single rotation of the crankshaft |
| US5335632A (en) * | 1993-05-14 | 1994-08-09 | Hefley Carl D | Variable compression internal combustion engine |
| CN101016863A (en) * | 2007-03-02 | 2007-08-15 | 袁辉 | Variable compression ratio device of piston reciprocating internal combustion engine |
| US7409901B2 (en) * | 2004-10-27 | 2008-08-12 | Halliburton Energy Services, Inc. | Variable stroke assembly |
| DE102010016037A1 (en) * | 2010-03-19 | 2011-09-22 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Switchover valve, particularly for controlling hydraulic fluid flow of internal combustion engine, has ballpoint mechanism, which is engaged by applying actuating impulse to actuating unit of ballpoint mechanism |
-
2018
- 2018-11-29 CN CN201811440363.1A patent/CN109252953B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5277155A (en) * | 1990-02-12 | 1994-01-11 | Louis Paquola | System for achieving four-stroke cycle in an internal combustion engine with a single rotation of the crankshaft |
| US5335632A (en) * | 1993-05-14 | 1994-08-09 | Hefley Carl D | Variable compression internal combustion engine |
| US7409901B2 (en) * | 2004-10-27 | 2008-08-12 | Halliburton Energy Services, Inc. | Variable stroke assembly |
| CN101016863A (en) * | 2007-03-02 | 2007-08-15 | 袁辉 | Variable compression ratio device of piston reciprocating internal combustion engine |
| DE102010016037A1 (en) * | 2010-03-19 | 2011-09-22 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Switchover valve, particularly for controlling hydraulic fluid flow of internal combustion engine, has ballpoint mechanism, which is engaged by applying actuating impulse to actuating unit of ballpoint mechanism |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109854368A (en) * | 2019-02-28 | 2019-06-07 | 一汽解放汽车有限公司 | A kind of compression ratio two-stage variable link mechanism and its adjusting method |
| CN109854369A (en) * | 2019-03-01 | 2019-06-07 | 一汽解放汽车有限公司 | A kind of dovetail groove type motor length can be changed link mechanism and its adjusting method |
| CN109854369B (en) * | 2019-03-01 | 2021-05-07 | 一汽解放汽车有限公司 | Dovetail slot type engine length-variable connecting rod mechanism and adjusting method thereof |
| CN110608095A (en) * | 2019-09-06 | 2019-12-24 | 吉林大学 | Electrically-driven double-thread variable-length connecting rod variable compression ratio mechanism |
| CN112855357A (en) * | 2021-01-24 | 2021-05-28 | 效俊林 | Variable piston stroke and variable compression ratio mechanism of internal combustion engine and control method |
| CN112855357B (en) * | 2021-01-24 | 2023-04-18 | 效俊林 | Variable piston stroke and variable compression ratio mechanism of internal combustion engine and control method |
| CN113819713A (en) * | 2021-09-23 | 2021-12-21 | 南宫市精强连杆有限公司 | Air cooling device for connecting rod |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109252953B (en) | 2021-10-08 |
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Granted publication date: 20211008 |