CN110439671A - A kind of free-piston engine scavenging structure - Google Patents
A kind of free-piston engine scavenging structure Download PDFInfo
- Publication number
- CN110439671A CN110439671A CN201910782901.3A CN201910782901A CN110439671A CN 110439671 A CN110439671 A CN 110439671A CN 201910782901 A CN201910782901 A CN 201910782901A CN 110439671 A CN110439671 A CN 110439671A
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- China
- Prior art keywords
- scavenging
- air
- air belt
- scavenging air
- belt
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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
- F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
- F02B25/14—Engines characterised by using fresh charge for scavenging cylinders using reverse-flow scavenging, e.g. with both outlet and inlet ports arranged near bottom of piston stroke
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a kind of free-piston engine scavenging structures, including cylinder and the exhaust duct being located on cylinder, it further include left scavenging air belt, right scavenging air belt, left scavenging air belt, right scavenging air belt are symmetrical about cylinder bore line, left scavenging air belt, right scavenging air belt are tilted to the direction far from exhaust duct, and left scavenging air belt, right scavenging air belt are tilted to cylinder head.Using symmetrical scavenging air belt arrangement, the reasonable layout of scavenging air-flow is realized；Left scavenging air belt, right scavenging air belt are tilted to the direction far from exhaust duct, and this week streaming scavenging air belt structure realizes the circumferential flow of scavenging air-flow；Left scavenging air belt, right scavenging air belt are tilted to cylinder head, achieve the purpose that scavenging air belt using tilted structure, can have upward air flow component, realize the perpendicular flow of air-flow.
Description
Technical field
The present invention relates to the free-piston engine technical field that new-energy automobile increases journey, specifically a kind of freedom
Piston engine scavenging structure.
Background technique
Energy consumption, environmental pollution and global warming are the environmental problems of current whole world mankind facing.As new
Emerging free-piston engine, it is small in size, light weight and the thermal efficiency are high the advantages that, improve the utilization of fuel oil to a certain extent
Efficiency.But common free-piston engine has a distinct disadvantage: the piston row of free-piston engine during scavenging
Journey is not fixed, and can reach top dead centre and bottom dead center position sometimes, it sometimes appear that the case where not arriving, therefore common scavenging
Structure will cause that scavenging process is incomplete, causes the relative position of piston and scavenging port that can change, causes to scavenging process
It influences.
Simple analysis is carried out to common free-piston to the case where not top dead center position, piston stroke is respectively
38mm2、36mm2And 34mm2, find constantly to reduce with the stroke of piston, cylinder interior oxygen quality score constantly reduces, i.e.,
Scavenging process in cylinder obviously dies down, and main cause is to shorten the time of contact of scavenging air belt and cylinder, and scavenging process is caused to be deteriorated.
Summary of the invention
The present invention is exactly to provide a kind of free-piston engine scavenging knot to solve deficiencies of the prior art
Structure realizes the reasonable layout of scavenging air-flow using symmetrical scavenging air belt arrangement；Left scavenging air belt, right scavenging air belt are to far from row
The direction of air flue tilts, and this week streaming scavenging air belt structure realizes the circumferential flow of scavenging air-flow；Left scavenging air belt, right scavenging air belt
It is tilted to cylinder head, achievees the purpose that scavenging air belt using tilted structure, can have upward air flow component, realize air-flow
Perpendicular flow.
The technical scheme adopted by the invention to solve the technical problem is that:
A kind of free-piston engine scavenging structure further includes that a left side is swept including cylinder and the exhaust duct being located on cylinder
Air flue, right scavenging air belt, left scavenging air belt, right scavenging air belt are symmetrical about cylinder bore line, and left scavenging air belt, right scavenging air belt are to far from exhaust
The direction in road tilts, and left scavenging air belt, right scavenging air belt are tilted to cylinder head.
The left scavenging air belt includes the first from left air flue, the second from left air flue, and right scavenging air belt includes a right air flue, right two air flues, the first from left
Air flue, a right air flue are symmetrical about the cylinder bore line, and the second from left air flue, right two air flues are about the cylinder bore line pair
Claim.
It is characterized in that the first from left air flue, a right air flue center line angle B range are 115-125 °, the left side
Two air flues, right two air flue center line angle A ranges are 145-155 °.
The first from left air flue, the second from left air flue, a right air flue, right two air flue center lines and cylinder-bore axis angle α range are
67-73°。
The first from left air flue, the second from left air flue, a right air flue, right two air flues are all made of tapered configuration.
It further include middle scavenging air belt, the center line of middle scavenging air belt and the cylinder bore line are overlapped, middle scavenging air belt and exhaust
Road is opposite.
The left scavenging air belt, right scavenging air belt converge in lower part respectively, and the air flue after converging is connected to by lower scavenging port
Cylinder, a right air flue, right two air flues pass through a right port respectively, right two ports are connected to cylinder, on a right port, right two ports
Lower edge is concordant.
The lower scavenging port lower edge is concordant with the bottom dead center position of engine；
When piston runs to top dead centre, a right port, the lower edge of right two ports are concordant with piston lower edge.
The port configurations of the left scavenging air belt are arranged symmetrically with right scavenging air belt port, a right port center and cylinder axis
Distance a range is that ± 0.05D, right side distance b of the two port centers away from cylinder axis are 0.23D -0.28D, and wherein D is cylinder diameter.
One port of the right side, right two port axial heights are Hs, a right port, right two port circumferencial directions arc length it
With for bs；Specific formula is as follows:
Wherein:
λ c=0.20-0.32
Ss is engine blow-through air amount
β s=bs/D
σ=Hs/S
λ=0.52-0.62
D --- cylinder diameter (rice)
S --- rush diameter (rice)
N --- revolving speed (rev/min)
I --- scavenging port number (a)
γ --- vertical scavenging angle (degree)
Than time cross-section Zs by following table with reference to selection:
The beneficial effects of the present invention are:
1, using symmetrical scavenging air belt arrangement, the reasonable layout of scavenging air-flow is realized；Left scavenging air belt, right scavenging air belt to
Direction far from exhaust duct tilts, and this week streaming scavenging air belt structure realizes the circumferential flow of scavenging air-flow；Left scavenging air belt, the right side
Scavenging air belt is tilted to cylinder head, is achieved the purpose that scavenging air belt using tilted structure, can there is upward air flow component, is realized
The perpendicular flow of air-flow.
2, scavenging air belt tilts feelings to the direction far from exhaust duct in left scavenging air belt, right scavenging air belt using symmetrical structure
Under condition, capable of making scavenging air-flow, portion meets far from exhaust duct position in the cylinder, and flow direction turns to exhaust duct after collision, certainly
When by piston engine scavenging, combustion chamber is discharged in the exhaust gas for uniformly generating in-cylinder combustion.
3, angle A and B are to realize that four air flues are tilted to the direction far from exhaust duct, realize air-flow along cylinder wall stream
It moves in the middle part of rear, converges rear blowback to exhaust duct, while in the case where middle scavenging air belt air-flow is blown, flowing to the current rate of exhaust duct
Increase, realizes better scavenging.
4, scavenging air belt uses the acclivitous structure of air flue, and scavenging air-flow can have upward air flow component, especially exist
When piston is by top dead centre downlink, cooperation piston top is slowly opened at the top of four air flues, and air-flow flows up, and is more conducive to sweep
Gas is thorough.
5, tapered configuration makes gas can be improved speed in flow process, and then is more advantageous to scavenging.
Detailed description of the invention
Fig. 1 is that the present invention deletes the isostructural scavenging air belt entity view of cylinder；
Fig. 2 is scavenging air belt of the present invention with respect to cylinder warp angle and port center and cylinder pintch view；
Fig. 3 is scavenging air belt of the present invention with respect to cylinder-bore axis angular views
Fig. 4 is the port view of the right scavenging air belt of the present invention.
In figure: the left scavenging air belt of 1-, the right scavenging air belt of 2-, scavenging air belt in 3-, 4- exhaust duct, 11- the first from left air flue, 12- the second from left gas
Road, one air flue of the right side 21-, two air flues of the right side 22-, one port of the right side 23-, two ports of the right side 24-, scavenging port under 25-.
Specific embodiment
In order to clearly illustrate the technical characterstic of this programme, below by specific embodiment, and its attached drawing is combined, to this
Invention is described in detail.Following disclosure provides many different embodiments or example is used to realize different knots of the invention
Structure.In order to simplify disclosure of the invention, hereinafter the component of specific examples and setting are described.In addition, the present invention can be with
Repeat reference numerals and/or letter in different examples.This repetition is that for purposes of simplicity and clarity, itself is not indicated
Relationship between various embodiments and/or setting is discussed.It should be noted that illustrated component is not necessarily to scale in the accompanying drawings
It draws.Present invention omits the descriptions to known assemblies and treatment technology and process to avoid the present invention is unnecessarily limiting.Art
The orientation or positional relationship of the instructions such as language "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second ", " third " are used for description purposes only, and it should not be understood as instruction or dark
Show relative importance.In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " peace
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
The concrete meaning of language in the present invention.
A kind of free-piston engine scavenging structure further includes that a left side is swept including cylinder and the exhaust duct being located on cylinder 4
Air flue 1, right scavenging air belt 2, left scavenging air belt 1, right scavenging air belt 2 are symmetrical about cylinder bore line, and left scavenging air belt 1, right scavenging air belt 2 are to remote
Direction inclination from exhaust duct 4, left scavenging air belt 1, right scavenging air belt 2 are tilted to cylinder head.
Using symmetrical scavenging air belt arrangement, the reasonable layout of scavenging air-flow is realized；Left scavenging air belt 1, right scavenging air belt 2 to
Direction far from exhaust duct 4 tilts, and this week streaming scavenging air belt structure realizes scavenging air-flow along cylinder wall circumferential flow；It is left
Scavenging air belt 1, right scavenging air belt 2 are tilted to cylinder head, achieve the purpose that scavenging air belt using tilted structure, can there is upward gas
Flow component realizes the perpendicular flow of air-flow.
The left scavenging air belt 1 includes the first from left air flue 11, the second from left air flue 12, and right scavenging air belt 2 includes a right air flue 21, right two gas
Road 22, the first from left air flue 11, a right air flue 21 are symmetrical about the cylinder bore line, the second from left air flue 12, right two air flues 22 about
The cylinder bore line is symmetrical.
Scavenging air belt is using symmetrical structure, in left scavenging air belt, right scavenging air belt to the direction inclination conditions far from exhaust duct
Under, capable of making scavenging air-flow, portion meets far from exhaust duct position in the cylinder, and flow direction turns to exhaust duct 1 after collision, certainly
When by piston engine scavenging, combustion chamber is discharged in the exhaust gas for uniformly generating in-cylinder combustion.
It is characterized in that the first from left air flue 11, right 21 center line angle B range of an air flue are 115-125 °, it is described
The second from left air flue 12, right two air flues, 22 center line angle A range be 145-155 °.It further include middle scavenging air belt 3, middle scavenging air belt
3 center line and the cylinder bore line are overlapped, and middle scavenging air belt 3 is opposite with exhaust duct 4.
Here angle A and B are to realize that four air flues are tilted to the direction far from exhaust duct 4, realize air-flow along cylinder
Wall flows in the middle part of rear, converges rear blowback to exhaust duct 4, i.e. flow direction turns to exhaust duct 4, while in middle 3 gas of scavenging air belt
Stream is blown down, and the current rate for flowing to exhaust duct 4 increases, and realizes better scavenging.
The first from left air flue 11, the second from left air flue 12, a right air flue 21, right two air flues, 22 center line and cylinder-bore axis angle α
Range is 67-73 °.
Scavenging air belt uses the acclivitous structure of air flue, and scavenging air-flow can have upward air flow component, especially in work
When plug is by top dead centre downlink, cooperation piston top is slowly opened at the top of four air flues, and air-flow flows up, and is more conducive to scavenging
Thoroughly.
The first from left air flue 11, the second from left air flue 12, a right air flue 21, right two air flues 22 are all made of tapered configuration.Make gas
It can be improved speed in flow process, and then be more advantageous to scavenging.
The left scavenging air belt 1, right scavenging air belt 2 converge in lower part respectively, and the air flue after converging is connected by lower scavenging port 25
Cylinder is passed to, a right air flue 21, right two air flues 22 are connected to cylinder, a right gas by a right port 23, right two ports 24 respectively
Mouth 23,24 lower edges of right two port are concordant.
25 lower edge of lower scavenging port is concordant with the bottom dead center position of engine；
When piston runs to top dead centre, a right port 23, the lower edge of right two ports 24 are concordant with piston lower edge.
As shown in Fig. 2, the port configurations of the left scavenging air belt 1 are arranged symmetrically with right 2 port of scavenging air belt, a right port 23
Center and cylinder pintch a range be ± 0.05D, right two ports, 24 center away from cylinder axis distance b is 0.23D-
0.28D, wherein D is cylinder diameter.
Above-mentioned port parameter is 2 relevant parameter of right scavenging air belt enumerated, and left scavenging air belt 1 and right scavenging air belt 2 are symmetrical, and a left side is swept
The parameter of air flue 1 is identical with right 2 parameter of scavenging air belt.
One port 23 of the right side, right two ports, 24 axial height are the label Hs in Hs, that is, Fig. 3, a right port 23, right
The sum of arc length of two ports, 4 circumferencial direction is bs, i.e. the sum of arc length bs1 in attached drawing 2 and arc length bs2；Specific formula is as follows:
Wherein:
λ c=0.20-0.32
Ss is engine blow-through air amount
β s=bs/D
σ=Hs/S
λ=0.52-0.62
D --- cylinder diameter (rice)
S --- rush diameter (rice)
N --- revolving speed (rev/min)
I --- scavenging port number (a)
γ --- vertical scavenging angle (degree)
Than time cross-section Zs by following table with reference to selection:
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (9)
1. a kind of free-piston engine scavenging structure, including cylinder and the exhaust duct being located on cylinder, characterized in that also wrap
Left scavenging air belt, right scavenging air belt are included, left scavenging air belt, right scavenging air belt are symmetrical about cylinder bore line, and left scavenging air belt, right scavenging air belt are to remote
Direction inclination from exhaust duct, left scavenging air belt, right scavenging air belt are tilted to cylinder head.
2. a kind of free-piston engine scavenging structure according to claim 1, characterized in that the left scavenging air belt includes
The first from left air flue, the second from left air flue, right scavenging air belt include a right air flue, right two air flues, and the first from left air flue, a right air flue are about the gas
Cylinder diameter line is symmetrical, and the second from left air flue, right two air flues are symmetrical about the cylinder bore line.
3. a kind of free-piston engine scavenging structure according to claim 2, characterized in that the first from left air flue, the right side
One air flue center line angle B range is 115-125 °, the second from left air flue, right two air flue center line angle A models
Enclose is 145-155 °.
4. a kind of free-piston engine scavenging structure according to claim 3, characterized in that the first from left air flue, a left side
Two air flues, a right air flue, right two air flue center lines and cylinder-bore axis angle α range are 67-73 °.
5. a kind of free-piston engine scavenging structure according to claim 4, characterized in that the first from left air flue, a left side
Two air flues, a right air flue, right two air flues are all made of tapered configuration.
6. a kind of free-piston engine scavenging structure according to claim 1, characterized in that it further include middle scavenging air belt,
The center line of middle scavenging air belt and the cylinder bore line are overlapped, and middle scavenging air belt is opposite with exhaust duct.
7. a kind of free-piston engine scavenging structure according to claim 6, characterized in that the left scavenging air belt,
Right scavenging air belt converges in lower part respectively, and the air flue after converging is connected to cylinder, a right air flue, right two air flues point by lower scavenging port
It is not connected to cylinder by a right port, right two ports, a right port, right two port lower edges are concordant.
8. a kind of free-piston engine scavenging structure according to claim 7, characterized in that under the lower scavenging port
Edge is concordant with the bottom dead center position of engine；
When piston runs to top dead centre, a right port, the lower edge of right two ports are concordant with piston lower edge.
9. a kind of free-piston engine scavenging structure according to claim 8, characterized in that the left scavenging air belt
Port configurations are arranged symmetrically with right scavenging air belt port, and a right port center and cylinder pintch a range are -0.05D -
0.05D, right side distance b of the two port centers away from cylinder axis are 0.2D -0.3D, and wherein D is cylinder diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910782901.3A CN110439671A (en) | 2019-08-23 | 2019-08-23 | A kind of free-piston engine scavenging structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910782901.3A CN110439671A (en) | 2019-08-23 | 2019-08-23 | A kind of free-piston engine scavenging structure |
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| CN110439671A true CN110439671A (en) | 2019-11-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112523860A (en) * | 2020-11-30 | 2021-03-19 | 象限空间（天津）科技有限公司 | Two-stroke engine with additional pulse exhaust |
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| CN1385602A (en) * | 2001-02-05 | 2002-12-18 | 株式会社共立 | Two-stroke internal combustion engine |
| CN2674129Y (en) * | 2003-12-31 | 2005-01-26 | 钱江集团有限公司 | Cylinder air channel of two stroke engine |
| CN101649770A (en) * | 2008-08-12 | 2010-02-17 | 日立工机株式会社 | Two cycle engine and tool |
| CN203515843U (en) * | 2013-11-15 | 2014-04-02 | 浙江哈雷动力机械有限公司 | Chain saw steam cylinder for two-stroke gasoline engine |
| CN104929766A (en) * | 2014-03-21 | 2015-09-23 | 北京理工大学 | Hydraulic free piston engine |
-
2019
- 2019-08-23 CN CN201910782901.3A patent/CN110439671A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85203399U (en) * | 1985-02-22 | 1986-07-02 | 皮亚乔公司 | Cylinder of double-stroke engine |
| CN1385602A (en) * | 2001-02-05 | 2002-12-18 | 株式会社共立 | Two-stroke internal combustion engine |
| CN2674129Y (en) * | 2003-12-31 | 2005-01-26 | 钱江集团有限公司 | Cylinder air channel of two stroke engine |
| CN101649770A (en) * | 2008-08-12 | 2010-02-17 | 日立工机株式会社 | Two cycle engine and tool |
| CN203515843U (en) * | 2013-11-15 | 2014-04-02 | 浙江哈雷动力机械有限公司 | Chain saw steam cylinder for two-stroke gasoline engine |
| CN104929766A (en) * | 2014-03-21 | 2015-09-23 | 北京理工大学 | Hydraulic free piston engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112523860A (en) * | 2020-11-30 | 2021-03-19 | 象限空间（天津）科技有限公司 | Two-stroke engine with additional pulse exhaust |
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Application publication date: 20191112 |