CN106837457A - For the variable valve timing mechanism of opposed-piston engine - Google Patents
For the variable valve timing mechanism of opposed-piston engine Download PDFInfo
- Publication number
- CN106837457A CN106837457A CN201710174371.5A CN201710174371A CN106837457A CN 106837457 A CN106837457 A CN 106837457A CN 201710174371 A CN201710174371 A CN 201710174371A CN 106837457 A CN106837457 A CN 106837457A
- Authority
- CN
- China
- Prior art keywords
- air inlet
- exhaust outlet
- slip cap
- connecting rod
- cylinder jacket
- Prior art date
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
-
- 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
- F02F1/22—Other cylinders characterised by having ports in cylinder wall for scavenging or charging
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention discloses a kind of variable valve timing mechanism for opposed-piston engine, belong to Structure of Internal-Combustion Engine technical field.Mechanism includes the cylinder jacket with multilayer gas port, air inlet slip cap, exhaust outlet slip cap, air inlet connecting rod, exhaust outlet connecting rod and adjustable crank.The corresponding engine speed of gas port number of plies correspondence in cylinder jacket, the i.e. mode of gas port regulation are adjusted using different gears.The mechanism is two slider-crank mechanisms of series connection, by adjusting adjustable crank, in the presence of inlet and outlet mouthful connecting rod, slip cap movement is driven, so as to realize the switching of the different gear gas port numbers of plies.The present invention is able to ensure that mean effective pressure of the opposed-piston engine under various operating modes and ventilation characteristic are optimal, so that cost-effective, raising system reliability.
Description
Technical field
The present invention relates to a kind of variable valve timing mechanism of internal combustion engine, and in particular to a kind of opposed-piston engine can
Become port timing mechanism, belong to Structure of Internal-Combustion Engine technical field.
Background technology
With the aggravation of energy crisis and environmental pressure, engine energy-saving emission reduction and lightweight turn into what it further improved
Important channel.Conventional, four-stroke engine is difficult further to improve due to the increase of equipment for after-treatment, and opposed-piston engine
With the thermal efficiency, it is lightweight the features such as, further paid close attention to.But traditional opposed-piston engine discharge performance it is very poor,
And the tissue of burning is also relatively difficult.Opposed-piston engine combines such as high-pressure injection, turbocharging of current engine technology
Etc. technology, good effect can be obtained.
Current VVT technologies (VVT) the extensive use on passenger car, and some vehicles are also real
Double VVT technologies of inlet and exhaust valve are showed.And only have product nanogram Pinnacle companies of the U.S. on opposed four reciprocating pistons engine and grind
The slip cylinder sleeve type variable valve timing mechanism of hair, engine inlet and outlet mouth is arranged on engine middle part, and cylinder jacket is two
It is individual, locked using spring, opened by fork type cam mechanism during work, then locked by spring return function, its mechanism is complex,
Requirement higher is proposed with sealing to lubrication.The mechanism cannot meet requirement of the opposed two stroke engine to scavenging process,
Therefore can not be applied on opposed two stroke engine.
The content of the invention
In view of this, the invention provides a kind of variable valve timing mechanism for opposed-piston engine, the mechanism
It is able to ensure that mean effective pressure of the opposed-piston engine under various operating modes and ventilation characteristic are optimal, so as to save into
Originally system reliability, is improved.
A kind of variable valve timing mechanism for opposed-piston engine, the mechanism includes that cylinder jacket, air inlet are slided
Set, exhaust outlet slip cap, air inlet connecting rod, adjustable crank and exhaust outlet connecting rod；
It is axially symmetric in the cylinder jacket to be provided with one group of circumferential air inlet and exhaust outlet, every group of air inlet and exhaust
The number of plies of opening's edge axial direction is the more than two-layer gas port number of plies corresponding engine speed of correspondence in the cylinder jacket；Air inlet and
Exhaust outlet is uniformly arranged along the circumference of cylinder jacket, and air inlet and exhaust outlet are shaped as rectangle, adjacent two-layer air inlet or row
Barrier muscle is formed between gas port；
The air inlet slip cap and exhaust outlet slip cap are slidably matched with the outer circumference surface of cylinder jacket respectively, described adjustable
Crank is arranged in cylinder jacket and between air inlet and exhaust outlet, the two ends of air inlet connecting rod respectively with adjustable crank and enter
Gas port slip cap is flexibly connected, and the two ends of exhaust outlet connecting rod are flexibly connected with adjustable crank and exhaust outlet slip cap respectively, adjustable
Crank, air inlet connecting rod and exhaust outlet connecting rod constitute toggle, and adjustable crank, adjustable crank are rotated by external agency
Air inlet connecting rod and exhaust outlet connecting rod is driven to cause that air inlet slip cap and exhaust slip cap are slided in cylinder jacket, so as to realize gas
The switching of the different gear gas port numbers of plies on cylinder sleeve.
Further, the principle of the different gear gas port layer switchings is the barrier muscle between two-layer gas port and air inlet slip
Air-flow is caused in the presence of set and exhaust outlet slip cap will not be entered from second layer gas port, so as to realize the switching of different gears.
Further, in the cylinder jacket gas port number of plies and port hight according to the cylinder diameter of different engines, stroke and work
Make final determination after speed conditions are optimized to the power index of engine and ventilation characteristic index.
Further, identical toggle is set in cylinder jacket opposite side, to meet the spirit of valve actuating mechanism regulation
Activity and reliability.
Beneficial effect：
The present invention changes port hight and realizes that many gears of opposed-piston engine are adjustable using variable valve timing mechanism,
By the conversion of phase to adapt to the requirement under different operating modes to air mass, final optimization pass ventilation and combustion process, improve
Engine performance.The other valve actuating mechanism uses external sliding sleeve (relative to cylinder), reduces the requirement to lubricating and seal, and has
Stronger reliability, can make engine be adapted to more severe working conditions.
Brief description of the drawings
Fig. 1 is variable valve timing mechanism sketch of the present invention (individual layer gas port opening)；
Fig. 2 is variable valve timing mechanism sketch of the present invention (double-deck gas port opening)；
Fig. 3 is the schematic diagram of different gas ports (gear) switching；
Fig. 4 is the scheme of erection of variable valve timing mechanism and engine；
Fig. 5 is the mean effective pressure comparison diagram of variable double-layer port hight and fixed port hight；
Fig. 6 is the scavenging efficiency comparison diagram of variable double-layer port hight and fixed port hight.
Wherein, 1- cylinder jacket, 2- air inlets slip cap, 3- exhaust outlets slip cap, 4- air inlets connecting rod, 5- adjustable cranks,
6- exhaust outlets connecting rod, 7- barrier muscle
Specific embodiment
Develop simultaneously embodiment below in conjunction with the accompanying drawings, and the present invention will be described in detail.
As shown in figure 1 and 2, the invention provides a kind of variable valve timing mechanism for opposed-piston engine,
The mechanism includes that cylinder jacket 1, air inlet slip cap 2, exhaust outlet slip cap 3, air inlet connecting rod 4, adjustable crank 5 and exhaust outlet connect
Bar 6；
It is axially symmetric in cylinder jacket 1 to be provided with one group of circumferential air inlet and exhaust outlet, in the present embodiment, every group of air inlet
Mouth and the exhaust outlet number of plies vertically are two-layer；Air inlet and exhaust outlet are uniformly arranged along the circumference of cylinder jacket 1, air inlet and row
Gas port is shaped as rectangle, and barrier muscle 7 is formed between adjacent two-layer air inlet or exhaust outlet；
As shown in Figure 3, air inlet slip cap 2 and exhaust outlet slip cap 3 slide with the outer circumference surface of cylinder jacket 1 match somebody with somebody respectively
Close, air inlet slip cap 2 and exhaust slip cap 3 are set in the air inlet side and exhaust side of cylinder jacket 1, moved by it and coordinate the
Barrier muscle 7 between one layer of gas port and second layer gas port, realizes the switching of the mono-/bis-layer gas port of gas port.In air inlet slip cap 2 and row
Having respectively on gas slip cap 3 has a pan on a small boss, for connecting air inlet connecting rod 4, exhaust outlet connecting rod 6.
Cylinder jacket middle part is provided with rotatable adjustable crank 5, and adjustable crank 5 is provided with pan, for connecting the He of air inlet connecting rod 4
The opposite side of exhaust outlet connecting rod 6.By rotating adjustable crank 5, under the drive of air inlet connecting rod 4 and exhaust outlet connecting rod 6, air inlet is slided
Dynamic set 2 and exhaust slip cap 3 are slided on cylinder, and the opening and closing of inlet and outlet mouthful are realized respectively.
Due to the asymmetry of Dan Tao mechanisms, slip cap force unbalance can be caused, ultimately resulting in it can not be in cylinder jacket
Upper easy slide, cylinder jacket opposite side set identical toggle, with meet valve actuating mechanism regulation flexibility and
Reliability.
As shown in Figure 4, mechanism of the invention applies in opposed-piston engine, and the two ends of cylinder jacket 1 correspond to respectively
A set of crank linkage driving system.The mechanism realizes that the switching of the different gears of inlet and outlet mouthful is (single by the rotation of adjustable crank 5
The switching of layer gas port and multilayer gas port), to adapt to opposed-piston engine under different operating modes to the requirement of inlet and outlet, so that
Improve the performance of engine.
The port timing set up respectively under same boundary conditions is variable and the constant engine simulation model of port timing, enters
Row simulation calculation is contrasted.Thus the mean effective pressure and the comparison diagram of scavenging efficiency of engine under two kinds of different conditions are obtained.
Accompanying drawing 5 is variable and the constant mean effective pressure of port timing the comparison diagram of port timing.Can from figure
Go out, under 1000rpm~6000rpm rotating speeds, it is constant that the variable mean effective pressure of port timing is substantially higher than port timing
Mean effective pressure, and in 4000rpm~6000rpm, the variable mean effective pressure of port timing is significantly higher than with gas phase
The constant mean effective pressure in position, highest can lift 11.8%.
Accompanying drawing 6 is for port timing is variable and the constant scavenging efficiency comparison diagram of port timing.It can be seen that
Under 1000rpm~6000rpm rotating speeds, the variable scavenging efficiency of port timing is substantially higher than the constant scavenging efficiency of port timing,
And in 4000rpm~6000rpm, the variable scavenging efficiency of port timing is significantly higher than the constant scavenging efficiency of port timing,
Highest can lift 18.9%.
In sum, presently preferred embodiments of the present invention is these are only, is not intended to limit the scope of the present invention.
All any modification, equivalent substitution and improvements within the spirit and principles in the present invention, made etc., should be included in of the invention
Within protection domain.
Claims (4)
1. the variable valve timing mechanism of opposed-piston engine is used for, it is characterised in that the mechanism includes cylinder jacket, air inlet
Slip cap, exhaust outlet slip cap, air inlet connecting rod, adjustable crank and exhaust outlet connecting rod；
It is axially symmetric in the cylinder jacket to be provided with one group of circumferential air inlet and exhaust outlet, every group of air inlet and exhaust outlet edge
The number of plies of axial direction is the more than two-layer gas port number of plies corresponding engine speed of correspondence in the cylinder jacket；Air inlet and exhaust
The circumference of opening's edge cylinder jacket is uniformly arranged, and air inlet and exhaust outlet are shaped as rectangle, adjacent two-layer air inlet or exhaust outlet
Between formed barrier muscle；
The air inlet slip cap and exhaust outlet slip cap are slidably matched with the outer circumference surface of cylinder jacket respectively, the adjustable crank
In cylinder jacket and between air inlet and exhaust outlet, the two ends of air inlet connecting rod respectively with adjustable crank and air inlet
Slip cap is flexibly connected, and the two ends of exhaust outlet connecting rod are flexibly connected with adjustable crank and exhaust outlet slip cap respectively, adjustable crank,
Air inlet connecting rod and exhaust outlet connecting rod constitute toggle, and adjustable crank is rotated by external agency, and adjustable crank drives
Air inlet connecting rod and exhaust outlet connecting rod cause that air inlet slip cap and exhaust slip cap are slided in cylinder jacket, so as to realize cylinder jacket
The switching of the upper different gear gas port numbers of plies.
2. the as claimed in claim 1 variable valve timing mechanism for being used for opposed-piston engine, it is characterised in that it is described not
It is the effect of the barrier muscle between two-layer gas port and air inlet slip cap and exhaust outlet slip cap with the principle of gear gas port layer switching
Under cause the air-flow will not to enter from second layer gas port, so as to realize the switching of different gears.
3. the variable valve timing mechanism of opposed-piston engine is used for as claimed in claim 1, it is characterised in that the gas
On cylinder sleeve the gas port number of plies and port hight according to the cylinder diameter of different engines, stroke and working speed condition to the power of engine
Property index and ventilation characteristic index optimize after final determine.
4. the variable valve timing mechanism for opposed-piston engine as described in claim 1,2 or 3, it is characterised in that
In cylinder jacket opposite side, identical toggle is set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710174371.5A CN106837457B (en) | 2017-03-22 | 2017-03-22 | Variable valve timing mechanism for opposed-piston engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710174371.5A CN106837457B (en) | 2017-03-22 | 2017-03-22 | Variable valve timing mechanism for opposed-piston engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106837457A true CN106837457A (en) | 2017-06-13 |
| CN106837457B CN106837457B (en) | 2019-04-09 |
Family
ID=59129292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710174371.5A Active CN106837457B (en) | 2017-03-22 | 2017-03-22 | Variable valve timing mechanism for opposed-piston engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106837457B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107916964A (en) * | 2017-12-01 | 2018-04-17 | 北京理工大学 | A kind of variable valve timing mechanism based on slip cylinder sleeve |
| CN109026461A (en) * | 2018-04-23 | 2018-12-18 | 北京理工大学 | A kind of internal combustion engine port hight regulating device |
| CN109404084A (en) * | 2018-11-15 | 2019-03-01 | 北京理工大学 | A kind of variable valve timing mechanism of opposed pistons two stroke engine |
| CN114961915A (en) * | 2022-06-02 | 2022-08-30 | 北京理工大学 | Device and method for adjusting eddy current direct current ratio of air inlet of opposed piston engine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007121086A2 (en) * | 2006-04-18 | 2007-10-25 | Cleeves Engines Inc. | An internal combustion engine |
| CN102168624A (en) * | 2011-05-25 | 2011-08-31 | 中国兵器工业集团第七○研究所 | Opposed-cylinder and opposed-piston two-stroke internal combustion engine cylinder liner |
| CN102758658A (en) * | 2011-04-25 | 2012-10-31 | 环保汽车国际公司 | Intake system for a two-stroke internal combustion engine |
| CN103147854A (en) * | 2011-12-07 | 2013-06-12 | 优华劳斯汽车系统（上海）有限公司 | Two-stroke free piston internal-combustion engine |
| CN103249920A (en) * | 2010-10-08 | 2013-08-14 | 品纳科动力有限公司 | Single piston sleeve valve with optional variable compression ratio capability |
-
2017
- 2017-03-22 CN CN201710174371.5A patent/CN106837457B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007121086A2 (en) * | 2006-04-18 | 2007-10-25 | Cleeves Engines Inc. | An internal combustion engine |
| CN103249920A (en) * | 2010-10-08 | 2013-08-14 | 品纳科动力有限公司 | Single piston sleeve valve with optional variable compression ratio capability |
| CN102758658A (en) * | 2011-04-25 | 2012-10-31 | 环保汽车国际公司 | Intake system for a two-stroke internal combustion engine |
| CN102168624A (en) * | 2011-05-25 | 2011-08-31 | 中国兵器工业集团第七○研究所 | Opposed-cylinder and opposed-piston two-stroke internal combustion engine cylinder liner |
| CN103147854A (en) * | 2011-12-07 | 2013-06-12 | 优华劳斯汽车系统（上海）有限公司 | Two-stroke free piston internal-combustion engine |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107916964A (en) * | 2017-12-01 | 2018-04-17 | 北京理工大学 | A kind of variable valve timing mechanism based on slip cylinder sleeve |
| CN107916964B (en) * | 2017-12-01 | 2019-10-18 | 北京理工大学 | A kind of variable valve timing mechanism based on sliding cylinder sleeve |
| CN109026461A (en) * | 2018-04-23 | 2018-12-18 | 北京理工大学 | A kind of internal combustion engine port hight regulating device |
| CN109026461B (en) * | 2018-04-23 | 2020-10-27 | 北京理工大学 | Internal combustion engine air port height adjusting device |
| CN109404084A (en) * | 2018-11-15 | 2019-03-01 | 北京理工大学 | A kind of variable valve timing mechanism of opposed pistons two stroke engine |
| CN114961915A (en) * | 2022-06-02 | 2022-08-30 | 北京理工大学 | Device and method for adjusting eddy current direct current ratio of air inlet of opposed piston engine |
| CN114961915B (en) * | 2022-06-02 | 2023-11-17 | 北京理工大学 | Device and method for adjusting vortex direct current ratio of air inlet of opposed-piston engine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106837457B (en) | 2019-04-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8539770B2 (en) | Exhaust arrangement for an internal combustion engine | |
| CN106837457A (en) | For the variable valve timing mechanism of opposed-piston engine | |
| US20090159022A1 (en) | Differential Speed Reciprocating Piston Internal Combustion Engine | |
| CN109630264A (en) | A kind of engine breathing structure of two stages of compression | |
| DE3921662C1 (en) | ||
| CN107916964B (en) | A kind of variable valve timing mechanism based on sliding cylinder sleeve | |
| CN103628943B (en) | The multi-functional continuous variable valve drive system of a kind of intensive style for 4 cylinder IC engines | |
| CN1944981A (en) | Air discharging section device for booster internal combustion engine | |
| US20190153906A1 (en) | Four stroke internal combustion engine and thereto-related method | |
| CN107420195B (en) | A kind of two stroke engine and method based on four-stroke engine structure | |
| GB2264333A (en) | Compound expansion i.c.piston engine. | |
| Abthoff et al. | The 2-stroke DI-diesel engine with common rail injection for passenger car application | |
| CN201137519Y (en) | Differential reciprocating-piston internal-combustion engines | |
| CN111720211A (en) | Variable compression ratio type five-stroke engine | |
| US6308681B1 (en) | Valve-arrangement for controlling gas in a piston-type internal-combustion engine | |
| CN103603699A (en) | Intensive multifunctional fully variable valve actuation system for 6-cylinder internal combustion engine | |
| US11598256B2 (en) | Throttle-at-valve apparatus | |
| CN101943093B (en) | Distribution auxiliary device of engine | |
| CN102155285B (en) | Novel four-stroke four-cylinder layered dual-vortex combustion energy-saving internal combustion engine with new gas distribution mechanism | |
| CN215761938U (en) | Combined engine | |
| CN113513424A (en) | Two-stroke diesel engine and air intake method thereof | |
| CN201318210Y (en) | Repeated work internal combustion engine | |
| SE1551415A1 (en) | Four Stroke Internal Combustion Engine Efficiently Utilisingthe Blowdown Energy in a Turbine | |
| CN110566362A (en) | Direct injection internal combustion engine with two valves per cylinder | |
| CN2368981Y (en) | Opposite piston IC engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |