CN211623542U - Two-stroke engine scavenging supercharging structure - Google Patents
Two-stroke engine scavenging supercharging structure Download PDFInfo
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- CN211623542U CN211623542U CN201922247943.5U CN201922247943U CN211623542U CN 211623542 U CN211623542 U CN 211623542U CN 201922247943 U CN201922247943 U CN 201922247943U CN 211623542 U CN211623542 U CN 211623542U
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- scavenging
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- limiting hole
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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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Abstract
The utility model provides a two-stroke engine scavenging pressure boost structure, including cylinder body combination and crankcase combination. The structure is provided with a crankcase scavenging flow-limiting hole in a crankcase scavenging passage, a cylinder scavenging flow-limiting hole is designed in the cylinder scavenging passage, and the effective area of the crankcase scavenging flow-limiting hole is larger than that of the cylinder scavenging flow-limiting hole. When the engine works normally, mixed gas in the crankcase enters the cylinder body scavenging passage after being pressurized through the crankcase scavenging flow-limiting hole, and is pressurized again under the action of the cylinder body scavenging flow-limiting hole, and the two structures interact with each other, so that the air flow speed can be greatly improved, the scavenging efficiency in the cylinder can be improved, the fuel atomization effect can be greatly promoted, the combustion efficiency can be improved, and the emission of THC and NOx in tail gas can be greatly reduced; scavenging restricted aperture sets up to an overall structure with cylinder body, crankcase body, can realize through the mould structure, need not to increase manufacturing procedure, has better manufacturability and practicality.
Description
Technical Field
The utility model relates to the technical field of engines, especially, relate to a two-stroke engine scavenging pressure boost structure.
Background
The structure of the low-emission two-stroke gasoline engine which is common in the market at present is divided into two types, one type is a post-treatment structure, a certain catalyst is added in a silencer, and waste gas is subjected to secondary combustion in the silencer so as to meet the requirement of emission reduction, and due to the reasons of cost limitation, safety temperature limitation at the side of the silencer and the like, the catalyst content is usually low, so that the THC + NOx value is high and is close to the emission limit value; the other type is a layered scavenging structure, namely the engine is in lean combustion, but the engine is influenced by factors such as the power of a gasoline engine, the combustion of mixed gas and the like, and the original emission data of the traditional layered scavenging structure usually hardly meets the emission regulation requirements.
There is known from ZL201220103042.4 a low-emission two-stroke gasoline engine cylinder, the side cover is provided with a flow-limiting hole at the joint surface with the cylinder, the flow-limiting hole is positioned on the side cover, similar to the principle of patent ZL201420160669.2, and after the side cover is assembled to the cylinder, the flow-limiting hole is also positioned at the middle upper position of the scavenging passage. Compared with a full-open type infinite orifice structure, the single-layer restricted orifice structure can improve a certain mixed gas flow speed, promote the atomization effect of partial fuel, improve the combustion efficiency, reduce harmful ingredients in tail gas to a certain extent, but has limited reduction effect on the harmful ingredients in the tail gas; on the other hand, from the aspects of structural manufacturability and product cost, the throttling hole is arranged on the side cover and limited by the structure of the die, the throttling hole cannot be formed by the die and can only be formed by a machining mode, and the machining cost is additionally increased. Therefore, it is urgently needed to develop a simple and effective scavenging supercharging device for reducing the emission of harmful substances of the engine.
Disclosure of Invention
The utility model provides a two-stroke engine scavenging pressure boost structure, including cylinder body combination and crankcase combination. The structure is provided with a crankcase scavenging flow-limiting hole in a crankcase scavenging passage, a cylinder scavenging flow-limiting hole is designed in the cylinder scavenging passage, and the effective area of the crankcase scavenging flow-limiting hole is larger than that of the cylinder scavenging flow-limiting hole. When the engine works normally, mixed gas in the crankcase enters the cylinder body scavenging passage after being pressurized through the crankcase scavenging flow-limiting hole, and is pressurized again under the action of the cylinder body scavenging flow-limiting hole, and the two structures interact with each other, so that the air flow speed can be greatly improved, the scavenging efficiency in the cylinder can be improved, the fuel atomization effect can be greatly promoted, the combustion efficiency can be improved, and the emission of THC and NOx in tail gas can be greatly reduced; scavenging restricted aperture sets up to an overall structure with cylinder body, crankcase body, can realize through the mould structure, need not to increase manufacturing procedure, has better manufacturability and practicality.
Drawings
FIG. 1 is a general view of the structure of the cylinder assembly of the present invention
FIG. 2 is a general view of the structure of the crankcase assembly of the present invention
FIG. 3 is a flow chart of the pressurized gas inside the engine of the present invention
The sequence numbers in the figures illustrate: 1. a cylinder body; 2. a first side cover; 3. a second side cover; 4. the cylinder body is provided with a scavenging flow limiting hole; 5. a front half crankcase; 6. a rear half crankcase; 7. a crankcase scavenging flow-limiting hole; 8. a piston; 9. a crankcase scavenging passage; 10. a primary scavenging channel of the cylinder body; 11. and a cylinder scavenging passage.
Detailed Description
As shown in fig. 1, 2 and 3, the scavenging and supercharging structure of the two-stroke engine comprises a cylinder block combination and a crankcase combination, wherein the cylinder block combination is composed of a cylinder block body 1, a side cover I2 and a side cover II 3. Cylinder body 1 forms cylinder body scavenging passage 11 with side cap one 2, the cooperation of side cap two 3, the design has scavenging restricted aperture 4 in the cylinder body scavenging passage 11, scavenging restricted aperture 4 includes a plurality of round holes, also can set to square hole or rectangular hole as required.
The crankcase assembly consists of a front half crankcase 5 and a rear half crankcase 6. The cooperation of preceding half crankcase 5 and half crankcase 6 forms crankcase scavenging passage 9, design has scavenging restricted aperture 7 in the crankcase scavenging passage 9, scavenging restricted aperture 7 includes a plurality of round holes, also can set to square hole or rectangular hole as required. The effective area of the crankcase scavenging flow-limiting hole 7 is larger than that of the cylinder scavenging flow-limiting hole 4.
When the engine works normally, the piston 8 compresses the mixed gas in the crankcase downwards, the mixed gas in the crankcase passes through the scavenging flow-limiting hole 7 from the crankcase scavenging passage 9, enters the cylinder body primary scavenging passage 10, then enters the cylinder body scavenging passage 11 through the cylinder body scavenging flow-limiting hole 4, and finally enters the cylinder body combustion chamber to burn and do work. The mixed gas in the crankcase is pressurized twice, so that the air speed and the fuel atomization effect are greatly improved, and the combustion efficiency is improved. The utility model discloses an implement THC and NOx's content in the greatly reduced tail gas, reach energy saving and emission reduction's purpose, make the engine discharge can satisfy the emission regulations requirements such as national second, Euro V, EPA, CARB. And the scavenging flow-limiting hole, the cylinder body and the crankcase body are arranged into an integral structure, the scavenging flow-limiting hole can be realized through a die structure, the processing procedure does not need to be increased, and the scavenging flow-limiting hole has better manufacturability and practicability.
Claims (2)
1. A two-stroke engine scavenging supercharging structure is characterized in that: including the cylinder body combination that contains cylinder body and two side covers, the crankcase combination that contains preceding half crankcase and latter half crankcase, the side cover forms cylinder body scavenging passage with the cooperation of cylinder body, the design has the crankcase scavenging passage in preceding half crankcase and the latter half crankcase, the design has cylinder body scavenging restricted aperture in the cylinder body scavenging passage, the design has crankcase scavenging restricted aperture in the crankcase scavenging passage, the effective area of crankcase scavenging restricted aperture is greater than the effective area of cylinder body scavenging restricted aperture.
2. A scavenging charge structure for a two-stroke engine according to claim 1, characterized in that: the cylinder body scavenging flow-limiting hole and the crankcase scavenging flow-limiting hole comprise a plurality of round holes, and can also be arranged into square holes or long holes according to requirements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922247943.5U CN211623542U (en) | 2019-12-16 | 2019-12-16 | Two-stroke engine scavenging supercharging structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922247943.5U CN211623542U (en) | 2019-12-16 | 2019-12-16 | Two-stroke engine scavenging supercharging structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211623542U true CN211623542U (en) | 2020-10-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922247943.5U Active CN211623542U (en) | 2019-12-16 | 2019-12-16 | Two-stroke engine scavenging supercharging structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211623542U (en) |
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2019
- 2019-12-16 CN CN201922247943.5U patent/CN211623542U/en active Active
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