CN1076004A - Two-stroke engine - Google Patents
Two-stroke engine Download PDFInfo
- Publication number
- CN1076004A CN1076004A CN92101526A CN92101526A CN1076004A CN 1076004 A CN1076004 A CN 1076004A CN 92101526 A CN92101526 A CN 92101526A CN 92101526 A CN92101526 A CN 92101526A CN 1076004 A CN1076004 A CN 1076004A
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- CN
- China
- Prior art keywords
- oil
- piston
- scavenging
- connecting rod
- stroke
- 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.)
- Pending
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- 230000002000 scavenging effect Effects 0.000 claims abstract description 32
- 239000000446 fuel Substances 0.000 claims abstract description 12
- 238000007906 compression Methods 0.000 claims abstract description 6
- 230000006835 compression Effects 0.000 claims abstract description 5
- 239000003921 oil Substances 0.000 claims description 40
- 238000007789 sealing Methods 0.000 claims description 13
- 238000005461 lubrication Methods 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 239000000314 lubricant Substances 0.000 claims description 9
- 239000003381 stabilizer Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 4
- 238000010304 firing Methods 0.000 claims description 3
- 239000000295 fuel oil Substances 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 238000009423 ventilation Methods 0.000 claims 1
- 230000001050 lubricating effect Effects 0.000 abstract description 3
- 239000010687 lubricating oil Substances 0.000 abstract 1
- 230000001473 noxious effect Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 210000000707 wrist Anatomy 0.000 description 1
Images
Classifications
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- 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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- Lubrication Of Internal Combustion Engines (AREA)
Abstract
A novel two-stroke engine uses a bearing bush type crankshaft bearing and a lubricating oil lubricating system which is repeatedly used, a cylinder cover and a cylinder body adopt a conventional two-stroke machine type structure, and have no air valve and still depend on a piston to control an air port. The back of the piston is provided with a scavenging pump cavity with better performance. The scavenging system is asymmetrically scavenged, and pure air is used for scavenging. The fuel is injected into the cylinder during the compression stroke when the air port is closed. The structure is simple, the number of parts is small, and the structure is not changed greatly. And the performance is higher, the reliability is better, characteristics such as harmful emission are less.
Description
The present invention relates to a kind of two-stroke reciprocating-piston engine, particularly a kind of performance is higher, and reliability is better, and noxious emission is less, and features simple structure, the novel two stroke engine of low production cost.
Two-stroke reciprocating-piston engine always, mainly by cylinder head, cylinder block, piston assembly, connecting rod crankshaft assembly, compositions such as crankcase; Its scavenging way is to be finished by an essential gas compressor.Its pattern:
A kind of is to utilize independent gas compressor to come scavenging.Another kind is that a kind of particular restriction ground gas compressor that is subjected to that utilizes the piston back side and crankcase to form comes scavenging.
Its shortcoming is:
Utilize independent gas compressor scavenging type, its complex structure, cost is higher.
Crankcase scavenging type, its structure is simpler, but because of structural relation, along following insoluble problem is arranged.
1, its greasy property is very poor, and most of lubricant oil is the vaporific firing chamber that enters, and quickens the formation of carbon deposit and burnt shape material, and increases the smoke intensity of exhaust, and noxious emission is more serious.
2, fuel consumption rate height, because use the inflammable mixture scavenging, a part of incoming mixture short circuit is discharged cylinder in vain by relief opening, causes fuel-economy performance variation, and noxious emission is increased.
3, its charging efficiency is poor, because the clearance volume of crankcase scavenging pattern gas compressor is very big to the ratio of displacement volume certainly.Because this restriction, this gas compressor is removed outside the situation of low-pressure ratio, can't provide satisfied efficient.
The invention provides a kind of improved two-stroke reciprocating-piston engine, advantage such as it has kept two-stroke reciprocating-piston engine always, and is simple in structure, in light weight, with low cost; And above-mentioned shortcoming is given the higher novel two stroke engine of a kind of with improvement performance.
The present invention is implemented by following structure:
Cylinder cap, cylinder body adopt the structure of conventional two stroke engine type, and no valve still relies on piston control gas port.The cylinder barrel middle part has transfer port and exhaust port, and transfer port is controlled by unidirectional flute spring valve, and is higher than the exhaust port layout, and taking a breath is asymmetric scavenging timing.The cylinder barrel bottom is provided with intake duct, and scavenging air belt is also controlled by flute spring valve.In inside, lower end surface, piston skirt one dividing plate is housed, piston cavity is closed.In cylinder barrel lower end surface and crankcase connecting part, a dividing plate also is housed crankcase and cylinder barrel are separated.Utilize the piston skirt dividing plate, form the very little scavenging pump chamber of a clearance between cylinder barrel and the crankcase partition wall.
Its uses four stroke engine the sort of bearing shell formula crankshaft bearing and connecting rod bearing, and adopts reusable oil lubrication system.Two oil transportation roads are arranged on the connecting rod.Article one, the oil transportation road connects crankshaft oil hole.Lubricant oil is transported to piston cavity.The cooling piston head; And the oil seepage hole by the piston skirt, be seeped into the piston skirt outer surface, lube pistons, cylinder barrel friction pair.Unnecessary lubricant oil is collected piston cavity by oil ring, with the lubricant oil of the cooling piston head back oil road by connecting rod, flow back in the crankcase, and lubrication system is pressure lubrication.
Be described in further detail below in conjunction with drawings and Examples:
Fig. 1 is the schematic representation of type concrete structure of the present invention.
Fig. 2 is the structural representation of Fig. 1 baffle assembly [11].
Fig. 3 is the structural representation of Fig. 1 baffle assembly [9].
Fig. 4 is the structural representation of Fig. 1 connecting rod [12].
With reference to Fig. 1, there are transfer port [19], exhaust port [18] in cylinder barrel [4] middle part; The intake duct [10] of symmetric arrangement, scavenging air belt [16] are arranged at the bottom; The cylinder barrel bottom end face is equipped with baffle assembly [11], and baffle assembly is system's bearing shell formula bent axle [13] and wet type crankcase [14] the same with four stroke engine down.There is pressure stabilizer [17] the cylinder barrel side, and the pressure stabilizer lower openings is connected on the scavenging air belt [16] of cylinder barrel bottom by flute spring valve; The big opening in top is connected on the transfer port [19] at cylinder barrel middle part by flute spring valve; Other has a little opening to be connected on the electromagnetism fuel oil-air injection device [1] by pipe fitting [21].The intake duct of cylinder barrel bottom [10] also is equipped with flute spring valve, and its outer end connects air-strainer.
Piston [5] head has twice compression ring [6]; There are oil seepage hole [7] and oil ring [8] in the skirt section.Inside, lower end surface, piston skirt has baffle assembly [9] that piston cavity is closed, and piston is positioned at cylinder barrel, and cylinder barrel is divided into the active chamber [20] on top and the scavenging pump chamber [15] of bottom.
Electromagnetic Control electromagnetism fuel oil-air injection device [1] and spark plug [2] regularly is housed on cylinder cap [3] firing chamber.
With reference to Fig. 2, cylinder barrel lower end surface baffle assembly [11], by the dividing plate [111] that is fixed between cylinder barrel lower end surface and the crankcase, be positioned at and prolong the bent axle radial direction above the dividing plate [111] back and forth and the sealing plate [112] of dividing plate [111] slide relative, Sealing overcoat [113] with sealing plate [112] one, in the middle of the Sealing overcoat [113] is Sealing [114], and Sealing [114] is the center with pin [115], makes reciprocal circular arc with Sealing overcoat [113] and slides; Sealing [114] central through bore and connecting rod profile section match, and with the connecting rod slide relative.
Because the setting of baffle assembly [11] has promptly guaranteed the parting seal between scavenging pump chamber [15] and the crankcase [14], and the proper motion of connecting rod [12] has not been had interference, is the critical component of this novel two stroke engine.
With reference to Fig. 3, lower end surface, piston skirt internal partition assembly [9], by the dividing plate [92] that is fixed on the piston skirt with snap ring [91], the sealing plate [93] that is positioned at above the dividing plate [92] is formed.Sealing plate [93] central through bore and connecting rod [12] profile section match, and fasten as one with connecting rod [12], prolong wrist pin radial direction and dividing plate [92] slide relative, reaching is lubricant oil in the closed piston chamber, and the swing of connecting rod [12] is not had interference, be the critical component of this novel two stroke engine lubrication system.
With reference to Fig. 4, connecting rod [12] is provided with oil transportation road [121], back oil road [122]; Oil transportation road lower openings [123] is positioned at the connecting rod bearing shell place, and upper opening [124] is positioned at piston pin hole and connecting rod small end upper end.Back oil road [125] suitable for reading is positioned at the top of piston skirt baffle assembly [9], and end opening [126] is positioned at connnecting rod big end circular arc place.
Below in conjunction with work cycle each functions of components is described.
Up by lower dead center when piston [5], scavenging pump chamber [15] pressure is during less than barometric pressure, and intake duct [10] flute spring valve is opened, and air enters scavenging pump chamber [15] through empty filter; When descending, scavenging pump chamber [15] pressure raises piston to atdc, and intake duct [10] flute spring valve is closed, and scavenging air belt [16] flute spring valve is opened, and air enters pressure stabilizer [17].When piston [5] when coming downwards to lower dead center, scavenging pump chamber [15] clearance is very little, so the air pressure that pumps is higher, much larger than the scavenging pressure of conventional crankcase scavenged engine.
When coming downwards to exhaust port [18], opens in piston [5], the pressure of active chamber [20] is during less than the pressure of pressure stabilizer [17], transfer port [19] flute spring valve is opened, fresh air enters in the active chamber [20] and carries out scavenging, because of transfer port [19] is higher than exhaust port [18], so exhaust port [18] is closed early than transfer port [19], be asymmetric scavenging timing.
On piston [5], be about to transfer port [19] when closing, pass through the pressurized air of pipe fitting [21] by pressure stabilizer [17] to electromagnetism fuel oil-air injection device [1], in electromagnetism fuel oil-air injection device [1] and after the fuel oil premixing, spray in the cylinder working chamber [20] by electromagnetism fuel oil-air injection device [1].When the pressure of compression process growth equated with the pressure of electromagnetism fuel oil-air injection device [1], electromagnetism fuel oil-air injection device [1] cut out.When compressing near top dead center, spark plug [2] igniting enters power stroke.Later circulation repeats.
Because of the pure air scavenging of this novel two stroke engine, so fuel consumption rate is lower, noxious emission is also less, and charging efficiency is higher, adds and utilizes the stratified charge scheme, and performance is greatly improved.
When engine running, by the oil pump of bent axle transmission lubricating pump is gone into main oil gallery, and enter connecting rod oil transportation road [121] by the connecting rod bearing shell oilhole, be ejected into underside of piston crown by connecting rod small end and cool off, reduce the temperature of piston crown; Collect in then in the chamber of being made up of piston skirt and baffle assembly [9], major part flow back in the crankcase by connecting rod back oil road [122]; Fraction is seeped into the piston skirt outer surface by piston skirt oil seepage hole [7], lube pistons [5], cylinder barrel [4] friction pair; Lubricant oil between piston [5] surface and the cylinder barrel [4] has compression ring [6] to stop above and makes it to enter in the active chamber [20], and strengthens the seal action of compression ring.Stop by oil ring [8] below to make it to enter scavenging pump chamber [15], and get back in the piston cavity, get back in the crankcase by connecting rod back oil road [122] then by the spill port of oil ring [8] interior edge face.
This lubrication system performance is very near the four stroke engine greasy property, and it is poor to the main parts size greasy property to have solved conventional two stroke engine lubrication system, and lubrication oil consumption is than problems such as height.And the lubrication oil consumption when reducing similar four stroke engine pump and inhaling.And be two times of four stroke engine to two stroke engine because of the work done frequency, and the high heat load that causes, decrease to some degree, unfailing performance also strengthens to some extent.Basically can reach lubricated, sealing, cooling, the cleaning action of lubrication system, be a kind of comparatively desirable pressure lubricating system.
The present invention compares with conventional two stroke engine, and parts increase few, and structure does not also have big change, and performance is greatly improved, and unfailing performance strengthens to some extent. The problem fatal to conventional two stroke engine, tool has some improvement. Thereby in small-sized field of internal combustion engine, Ying Youyi is the position on the ground.
Claims (3)
1, a kind of reciprocating piston two stroke engine adopts the structure of conventional two-stroke type cylinder cap and cylinder barrel, and no valve still relies on piston control gas port; And use bearing shell formula crankshaft bearing and connecting rod bearing, adopt reusable oil lubrication system.It is characterized in that:
A, in cylinder barrel [4] lower end surface and crankcase [14] connecting part, baffle assembly [11] is housed, be provided with Sealing [113], [114] in the baffle assembly [11], with connecting rod [12] slide relative, keep the sealing between scavenging pump chamber [15] and the crankcase [14].Make piston [5] back form the very little scavenging pump chamber [15] of clearance volume.
There is oil seepage hole [7] in b, piston [5] skirt section, oil ring [8], and there is baffle assembly [9] inside, lower end surface, skirt section, and piston cavity is closed; Be transported to the lubricant oil of piston cavity by connecting rod [12], behind the cooling piston head, by oil seepage hole [7], lube pistons [5], cylinder barrel [4] friction pair.
C, connecting rod [12] are provided with oil transportation road [121], back oil road [122]; Oil transportation road [121] connects bent axle [13] oilhole, and lubricant oil is transported to piston [5] inner chamber; Back oil road [122] is failed the lubricant oil of piston [5] inner chamber and is got back in the crankcase [14].
2, the described two stroke engine of claim 1 is characterized in that cylinder barrel [4] bottom is provided with intake duct [10], scavenging air belt [16]; The middle part is provided with transfer port [19], exhaust port [18], and transfer port [19] connects pressure stabilizer [17] by flute spring valve, and is higher than exhaust port [18] layout, and ventilation is asymmetric scavenging timing, and uses pure air scavenging.
3, claim 1,2 described two stroke engines is characterized in that on cylinder cap [3] firing chamber electromagnetism fuel oil-air injection device [1] being housed, spark plug [2]; Be communicated with electromagnetism fuel oil-air injection device [1] and pressure stabilizer [17] by pipe fitting [21], fuel oil is closed at gas port, sprays into active chamber [20] during compression stroke.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92101526A CN1076004A (en) | 1992-03-04 | 1992-03-04 | Two-stroke engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92101526A CN1076004A (en) | 1992-03-04 | 1992-03-04 | Two-stroke engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1076004A true CN1076004A (en) | 1993-09-08 |
Family
ID=4939163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92101526A Pending CN1076004A (en) | 1992-03-04 | 1992-03-04 | Two-stroke engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1076004A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100476185C (en) * | 2001-04-30 | 2009-04-08 | 本田技研工业株式会社 | Piston for internal combustion engine |
| CN101568464B (en) * | 2006-11-15 | 2011-05-04 | Sika技术股份公司 | Baffle assembly |
| CN103174512A (en) * | 2013-03-28 | 2013-06-26 | 安徽中鼎动力有限公司 | Two-stroke engine with oil ring |
| CN103277219A (en) * | 2013-05-31 | 2013-09-04 | 中国人民解放军理工大学 | Oxygen-fired zero-valve two-stroke efficient micro-emission internal combustion engine |
| GB2528748A (en) * | 2014-06-03 | 2016-02-03 | Manousos Pattakos | Asymmetric transfer and intake in two-strokes |
-
1992
- 1992-03-04 CN CN92101526A patent/CN1076004A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100476185C (en) * | 2001-04-30 | 2009-04-08 | 本田技研工业株式会社 | Piston for internal combustion engine |
| CN101568464B (en) * | 2006-11-15 | 2011-05-04 | Sika技术股份公司 | Baffle assembly |
| CN103174512A (en) * | 2013-03-28 | 2013-06-26 | 安徽中鼎动力有限公司 | Two-stroke engine with oil ring |
| CN103277219A (en) * | 2013-05-31 | 2013-09-04 | 中国人民解放军理工大学 | Oxygen-fired zero-valve two-stroke efficient micro-emission internal combustion engine |
| GB2528748A (en) * | 2014-06-03 | 2016-02-03 | Manousos Pattakos | Asymmetric transfer and intake in two-strokes |
| GB2528748B (en) * | 2014-06-03 | 2016-08-17 | Pattakos Manousos | Asymmetric transfer and intake in two-strokes |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |