CN105840339B - Layered scavenging two-stroke engine piston - Google Patents
Layered scavenging two-stroke engine piston Download PDFInfo
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- CN105840339B CN105840339B CN201610350520.4A CN201610350520A CN105840339B CN 105840339 B CN105840339 B CN 105840339B CN 201610350520 A CN201610350520 A CN 201610350520A CN 105840339 B CN105840339 B CN 105840339B
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- scavenging
- air inlet
- channel
- stroke engine
- internal channel
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- 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
- F02F3/00—Pistons
- F02F3/24—Pistons having means for guiding gases in cylinders, e.g. for guiding scavenging charge in two-stroke engines
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Supercharger (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The present invention relates to general small-size two stroke engine technical field, more particularly to a kind of piston of layered scavenging two-stroke engine.The piston skirt air inlet side both sides are respectively equipped with half-closed internal channel, including pure air inlet channel, internal channel, ventilation passage, pin-and-hole, when piston is in cylinder body in upward motion process, half-closed internal channel communicates with the pure air air inlet of cylinder body, the enclosed scavenging air belt that pure air enters cylinder body through half-closed internal channel is stored with the charge stratification entered from crankcase, after mixture combustion does work, piston moves down, gas in enclosed scavenging air belt is pressed into cylinder body by crankcase pressure increase successively, pure air is cleared away in advance to tail gas, discharged from exhaust outlet, then pure air and gaseous mixture, gaseous mixture carries out scavenging successively, because substantial amounts of pure air is cleared away in advance, effectively reduce the application of gaseous mixture, effectively reduce the discharge of tail gas, protect environment.
Description
Technical field
The present invention relates to general small-size two stroke engine technical field, more particularly to a kind of layered scavenging two-stroke is started
The piston of machine.
Background technology
Lower exhaust emissions limit has been formulated Small Universal two stroke engine in the countries and regions such as China, European Union, the U.S.
Value, more particularly, to brush cutter, chain saw, the hand-held tool product such as hair-dryer.Current hand-held tool mainly uses tail
Two methods of gas post-processing technology and guide's pure air layered scavenging technology are to reduce exhaust emissions.
At present, have in layered scavenging two-stroke engine using storage portion of air takes the lead in sweeping in advance in scavenging air belt
Gas, to reduce the phenomenon that gaseous mixture is expelled directly out without burning with waste gas, so as to effectively reduce the harmful components such as HC in tail gas
With CO compounds, environment is protected.Such as a kind of layered scavenging two-stroke gasoline engine cylinder bodies of ZL201520130727.1, there is section
Different big scavenging air belts and small scavenging air belt are accumulated, is provided with choke block in small scavenging air belt, air is stored in scavenging air belt through piston, is swept
Air enters cylinder body combustion chamber scavenging during gas, it is possible thereby to which it is unburned to reduce part existing for common two-stroke gasoline engine
The phenomenon that gaseous mixture is escaped with waste gas, effectively reduce the compound emission such as HC and CO in tail gas.But show by substantial amounts of experiment,
When engine is in and run at high speed, the air capacity of scavenging air belt memory storage is on the low side, not only has air during scavenging, also have part without
The gaseous mixture of burning participates in scavenging, therefore, the discharge of the compounds such as HC and CO can't be completely eliminated in tail gas, be unfavorable for
Environmental protection, therefore, it is badly in need of the layered scavenging two-stroke gasoline engine that a kind of air capacity of leading scavenging is more, scavenging efficiency is high,
The content of the compound such as HC and CO in tail gas can be effectively reduced, well environmental protection.
The content of the invention
It is an object of the invention to provide a kind of piston for the new construction that can realize guide's pure air layered scavenging technology, piston
In cylinder body in upward motion process, substantial amounts of pure air can by pure air inlet channel that piston is provided with, internal channel, change
Gas passage enters in the enclosed scavenging air belt in cylinder body, is layered in enclosed scavenging air belt with mixed Daqu, utilizes scavenging during scavenging
Guide's pure air in road takes the lead in clearing away tail gas, because the content of pure air in enclosed scavenging air belt is a lot, greatly reduces mixing
The consumption of gas, so as to advantageously reduce the discharge of the compound such as HC and CO in tail gas, protect environment.
To solve technical problem, the invention provides a kind of piston of layered scavenging two-stroke engine, one kind layering is swept
Gas two stroke engine piston, including pin-and-hole, piston skirt, it is characterised in that：The piston skirt air inlet side both sides difference
Provided with half-closed internal channel, the half-closed internal channel includes pure air inlet channel, is set in the bottom of pure air inlet channel
There is internal channel, open channel one is provided between the chamfering on the outside of the internal channel and the pin-and-hole, is set in the pin-and-hole bottom
There is the ventilation passage communicated with internal channel, open channel two is provided between the ventilation passage and chamfering.
Preferably, the ventilation passage is more than the air inlet open area of internal channel.
Further, the internal channel is circular hole, and the Circularhole diameter scope is 0.11~0.18 times of piston diameter, preferably
0.13~0.16 times of piston diameter.
Further, the ventilation passage is strip.
Further, the ventilation passage is circle.
Preferably, mm × 45 ° of the chamfer dimesion preferably 2 mm × 45 °~4.
Preferably, the piston intake mouth side both sides inlet channel spacing L1More than cylinder body mixed gas inlet width L2。
Further, the piston skirt air inlet side per side at least provided with：One pure air inlet channel, lead in one
Road, ventilation passage, open channel one, an open channel two.
The beneficial effects of the invention are as follows：A kind of piston that can realize guide's pure air layered scavenging, piston in cylinder body to
In upper motion process, substantial amounts of pure air can be entered by the pure air inlet channel, internal channel, ventilation passage that piston is provided with
In enclosed scavenging air belt in cylinder body, it is layered in enclosed scavenging air belt with mixed Daqu, utilizes the guide in scavenging air belt during scavenging
Pure air takes the lead in clearing away tail gas, then gaseous mixture scavenging, because the content of pure air in enclosed scavenging air belt is a lot, greatly reduces
The consumption of gaseous mixture, so as to advantageously reduce the discharge of the compound such as HC and CO in tail gas, protect environment.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the present invention, originally shows
Meaning property embodiment and its illustrate be used for explain the present invention, do not form inappropriate limitation of the present invention.
Fig. 1 the present invention program piston axonometric drawings
Fig. 2 the present invention program piston front views
Fig. 3 the present invention program piston left views
Fig. 4 the present invention program piston right views
Fig. 5 the present invention program cylinder body front views
Fig. 6 the present invention program pure air guides and pure air and gaseous mixture cleaning tail gas schematic diagram
Fig. 7 the present invention program piston pure air inlet channels engage schematic diagram with air inlet
Fig. 8 the present invention program pure air circulation path schematic diagrames.
Number explanation in accompanying drawing：1st, piston；2nd, pure air inlet channel；3rd, open channel one；4th, internal channel；5th, open type is led to
Road two；6th, ventilation passage；7th, piston skirt；8th, chamfering；9th, pin-and-hole；10th, cylinder body；11st, pure air air inlet；12nd, gaseous mixture enters
Gas port；13rd, exhaust outlet；14th, enclosed scavenging air belt；L1, air inlet side, two pure air inlet channel spacing；L2, cylinder body gaseous mixture enters
The width of gas port；F, pure air；C, pure air and gaseous mixture；H, gaseous mixture.
Embodiment
As shown in Fig. 1~Fig. 8, piston 1 includes half-closed internal channel（Including pure air inlet channel 2, open channel 1,
Internal channel 4, open channel 25, ventilation passage 6, pin-and-hole 8, chamfering 9）, piston skirt 7.
Half-closed internal channel is respectively equipped with the both sides of the air inlet side of piston skirt 7 of piston 1, half-closed internal channel is by pure
Air inlet passage 2, internal channel 4, open channel 1, open channel 25, ventilation passage 6, pin-and-hole 9, chamfering 8 form.
Internal channel 4 is located at the bottom surface of pure air inlet channel 2, and the outside of pin-and-hole 9 is provided with chamfering 8, in open channel 1 connects
Passage 4 and chamfering 8, immediate boiling passage 1 penetrate pin-and-hole 9, chamfering 8, pure air inlet channel 2, internal channel 4.
Internal channel 4 penetrates with ventilation passage 6, takes a breath and is penetrated between passage 6 and chamfering 8 by open channel 25.Immediate boiling
Passage 25 penetrates pin-and-hole 9, chamfering 8, ventilation passage 6, internal channel 4.
Specific work process：
Piston 1 is in cylinder body 10 in upward motion process, in certain crank angle range,
When pin-and-hole 9, chamfering 8 connect with the enclosed scavenging air belt 14 of cylinder body, the pure air air inlet 11 and pure air of cylinder body
Inlet channel 2 communicates, and under crankcase suction function, pure air passes sequentially through following path respectively：The pure air air inlet of cylinder body
One 3 → pin-and-hole of mouth 11 → pure air, 2 → open channel of inlet channel 9 and 8 → enclosed of chamfering scavenging air belt 14；At the same time, pure sky
Gas also passes through following path：4 → open channel of pure air air inlet 11 → pure air, 2 → internal channel of inlet channel 25 of cylinder body
→ pin-and-hole 9 and 8 → enclosed of chamfering scavenging air belt 14.
During piston 1 continues up in cylinder body 10, in certain crank angle range,
When pure air inlet channel 2 connects with the pure air air inlet 11 of cylinder body, when pure air inlet channel 2, ventilation are logical
When road 6 connects with enclosed scavenging air belt 14, under crankcase suction function, pure air passes sequentially through following path：The pure sky of cylinder body
Gas air inlet 11 → pure air, 2 → enclosed of inlet channel scavenging air belt 14；At the same time, pure air also passes through following path：Cylinder body
2 → internal channel of pure air air inlet 11 → pure air inlet channel 4 → ventilation 6 → enclosed of passage scavenging air belt 14.
Pure air passes through above-mentioned path, is layered into enclosed scavenging air belt 14, and with mixed Daqu, formation pure air F layers,
Pure air and gaseous mixture C layers, gaseous mixture H layers.
After mixture combustion acting, piston 1 moves downward, and crankcase pressure increases the gas in enclosed scavenging air belt 14
Be pressed into cylinder body 10 successively, pure air cleared away, discharged from exhaust outlet 13 in advance to tail gas, then pure air and gaseous mixture, mix
Close gas and carry out scavenging successively, because substantial amounts of pure air is cleared away in advance, effectively reduce the application of gaseous mixture, effectively reduce tail
The discharge of gas, protects environment.
Although the structure to the implementation present invention, method are described in detail above, the present invention is not limited to this,
In the range of the technological thought of the present invention and purpose is not departed from, those skilled in the art can be in shape, size, Qi Taxiang
In terms of fine texture, modification is carried out to the embodiment, modification is done and is still included in the present invention.
Claims (9)
1. a kind of layered scavenging two-stroke engine piston, including pin-and-hole（9）, piston skirt（7）, it is characterised in that：The work
Fill in skirt section（7）Air inlet side both sides are respectively equipped with half-closed internal channel, and the half-closed internal channel includes pure air inlet channel
（2）, in pure air inlet channel（2）Bottom be provided with internal channel（4）, in the internal channel（4）With the pin-and-hole（9）Outside
Chamfering（8）Between be provided with open channel one（3）；In the pin-and-hole（9）Bottom is provided with and internal channel（4）The ventilation passage communicated
（6）, in the ventilation passage（6）With chamfering（8）Between be provided with open channel two（5）；The pure air inlet channel（2）And institute
State pin-and-hole（9）Respectively with the pure air air inlet of cylinder body（11）With the enclosed scavenging air belt of cylinder body（14）It is connected.
2. layered scavenging two-stroke engine piston according to claim 1, it is characterised in that：The ventilation passage（6）
More than internal channel（4）Air inlet open area.
3. layered scavenging two-stroke engine piston according to claim 2, it is characterised in that：The internal channel（4）For
Circular hole, the Circularhole diameter scope are 0.11~0.18 times of piston diameter.
4. layered scavenging two-stroke engine piston according to claim 3, it is characterised in that：The Circularhole diameter scope
For 0.13~0.16 times of piston diameter.
5. layered scavenging two-stroke engine piston according to claim 2, it is characterised in that：The ventilation passage（6）
For strip.
6. layered scavenging two-stroke engine piston according to claim 2, it is characterised in that：The ventilation passage（6）
For circle.
7. layered scavenging two-stroke engine piston according to claim 1, it is characterised in that：The chamfering（8）Size
For mm × 45 ° of 2 mm × 45 °~4.
8. layered scavenging two-stroke engine piston according to claim 1, it is characterised in that：The piston（1）Air inlet
Mouth side both sides inlet channel（2）Spacing L1More than cylinder body mixed gas inlet width L2。
9. according to the layered scavenging two-stroke engine piston described in claim any one of 1-8, it is characterised in that：The piston
Skirt section（7）Air inlet side per side at least provided with：One internal channel（4）, a ventilation passage（6）, open channel one（3）, open type
Passage two（5）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610350520.4A CN105840339B (en) | 2016-05-25 | 2016-05-25 | Layered scavenging two-stroke engine piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610350520.4A CN105840339B (en) | 2016-05-25 | 2016-05-25 | Layered scavenging two-stroke engine piston |
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| Publication Number | Publication Date |
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| CN105840339A CN105840339A (en) | 2016-08-10 |
| CN105840339B true CN105840339B (en) | 2018-03-20 |
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| CN201610350520.4A Active CN105840339B (en) | 2016-05-25 | 2016-05-25 | Layered scavenging two-stroke engine piston |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3284939B1 (en) * | 2016-08-19 | 2020-07-15 | Andreas Stihl AG & Co. KG | Piston for a two-stroke engine working with direct injection and two-stroke engine |
| CN109826719A (en) * | 2019-03-20 | 2019-05-31 | 山东华盛农业药械有限责任公司 | Two-stroke gasoline engine cylinder body |
| CN113107662A (en) * | 2021-05-08 | 2021-07-13 | 永康市茂金园林机械有限公司 | Cylinder piston unit for stratified scavenging two-stroke engine |
| CN113107661A (en) * | 2021-05-08 | 2021-07-13 | 永康市茂金园林机械有限公司 | Layered scavenging two-stroke engine |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7082910B2 (en) * | 1999-01-19 | 2006-08-01 | Aktiebolaget Electrolux | Two-stroke internal combustion engine |
| FR2840019B1 (en) * | 2002-05-24 | 2005-08-19 | Stihl Ag & Co Kg Andreas | TWO-STROKE MOTOR WITH IMPROVED SCAN MOBILE PISTON |
| CN201560858U (en) * | 2009-11-30 | 2010-08-25 | 天津内燃机研究所 | Engine piston |
| CN102392760A (en) * | 2011-08-26 | 2012-03-28 | 山东华盛农业药械有限责任公司 | Carburetor of two-stroke layered scavenging engine |
| US9856819B2 (en) * | 2014-02-02 | 2018-01-02 | Nagesh Siddabasappa Mavinahally | Piston and cylinder for two-stroke engine |
| CN205744178U (en) * | 2016-05-25 | 2016-11-30 | 山东华盛农业药械有限责任公司 | A kind of layered scavenging two-stroke engine piston |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Stratified scavenging two-stroke engine piston Effective date of registration: 20211230 Granted publication date: 20180320 Pledgee: China Construction Bank Corporation Linyi Luozhuang sub branch Pledgor: SHANDONG HUASHENG PESTICIDE MACHINERY Co.,Ltd. Registration number: Y2021980017162 |
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Date of cancellation: 20230829 Granted publication date: 20180320 Pledgee: China Construction Bank Corporation Linyi Luozhuang sub branch Pledgor: SHANDONG HUASHENG PESTICIDE MACHINERY Co.,Ltd. Registration number: Y2021980017162 |
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