CN216518308U - Two-stroke gasoline engine crankcase with scavenging passage - Google Patents
Two-stroke gasoline engine crankcase with scavenging passage Download PDFInfo
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- CN216518308U CN216518308U CN202122493378.8U CN202122493378U CN216518308U CN 216518308 U CN216518308 U CN 216518308U CN 202122493378 U CN202122493378 U CN 202122493378U CN 216518308 U CN216518308 U CN 216518308U
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- scavenging passage
- scavenging
- crankcase
- mixed gas
- passage
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Abstract
The utility model discloses a two-stroke gasoline engine crankcase with a scavenging passage. The crankcase is provided with a horizontal scavenging passage, a vertical scavenging passage and a mixed gas storage cavity which are communicated. The inlet of the horizontal scavenging passage and the mixed gas storage cavity are designed in the crankcase; the mixed gas outlet of the vertical scavenging passage is designed on the flange surface of the crankcase and is communicated with the scavenging passage of the cylinder body to form a lengthened closed scavenging passage. Has the advantages that: the increase of the length of the closed scavenging passage is beneficial to improving the stability of scavenging of the mixed gas, improving the scavenging speed and stabilizing the scavenging direction, and can effectively improve the power of the engine, reduce the oil consumption and reduce the exhaust emission.
Description
Technical Field
The utility model relates to the technical field of general small two-stroke engines, in particular to a two-stroke gasoline engine crankcase with a scavenging passage.
Background
A large number of tests show that the closed scavenging passage is beneficial to the stability of mixed gas intake and scavenging tail gas, reduces the short-circuit loss of the mixed gas, improves the scavenging speed, stabilizes the scavenging direction, and can effectively improve the power, the high-low speed stability, the tail gas emission and the like of the engine. For example, in the utility model patents of a closed scavenging passage (ZL 201610874957.8) of a two-stroke engine, a two-stroke engine with air pilot type scavenging (ZL 201110020897.0) and the like, a scavenging passage is designed on a crankcase, and the scavenging passage connects a cylinder scavenging passage and the crankcase through a gap between main bearing balls. However, the scavenging passage inlet is positioned between the main bearing and the oil seal, and the distance of the position of the crankcase needs to be increased, so that the volume and the weight of the crankcase are increased.
The utility model relates to a two-stroke gasoline engine crankcase with a scavenging passage, which is provided with a horizontal and vertical closed scavenging passage, a mixed gas storage cavity and a lengthened closed scavenging passage formed by the cylinder closed scavenging passage. After the mixed gas in the crankcase enters the horizontal scavenging passage through the mixed gas storage cavity and the horizontal scavenging passage inlet, the mixed gas sequentially passes through the vertical scavenging passage and the closed scavenging passage on the cylinder body and enters the cylinder body. The distance between the main bearing of the crankcase and the oil seal can be effectively reduced, and the size and the weight of the crankcase are reduced. And simultaneously, the device can improve the stability of mixed gas scavenging, improve the scavenging speed, stabilize the scavenging direction, and effectively improve the power of the engine, reduce the oil consumption and reduce the exhaust emission.
Disclosure of Invention
The utility model aims to provide a two-stroke gasoline engine crankcase with a lengthened scavenging passage, which can increase the length of a closed scavenging passage and has the advantages of realizable die, simple structure, low cost, easy processing, small volume, light weight and the like.
The technical scheme of the utility model is as follows:
the utility model provides a two-stroke gasoline engine crankcase with scavenge way which characterized in that: at least one horizontal scavenging passage, at least one vertical scavenging passage and at least one mixed gas storage cavity are designed on the crankcase; the horizontal scavenging passage and the vertical scavenging passage are communicated with the mixed gas storage cavity; the inlet of the horizontal scavenging passage and the mixed gas storage cavity are designed in the crankcase; and the outlet of the vertical scavenging passage is designed on the flange surface of the crankcase and is communicated with the closed scavenging passage of the cylinder body.
The mixed gas storage cavity, the horizontal scavenging passage and the vertical scavenging passage which are communicated with the crankcase are communicated with the closed scavenging passage on the cylinder body to form a lengthened closed scavenging passage; the mixed gas in the mixed gas storage cavity enters the horizontal scavenging passage through the horizontal scavenging passage inlet, sequentially passes through the vertical scavenging passage and the closed scavenging passage on the cylinder body, and enters the cylinder body.
The beneficial effects are that: the mixed gas in the mixed gas storage cavity enters the horizontal scavenging passage through the horizontal scavenging passage inlet, sequentially passes through the vertical scavenging passage and the closed scavenging passage on the cylinder body, passes through the scavenging port, and finally enters the cylinder body combustion chamber for combustion, so that the length of the closed scavenging passage is increased. Experiments prove that the increase of the length of the closed scavenging passage is beneficial to layering of pure air and mixed gas, the stability of pure air pilot scavenging tail gas is improved, the loss of the mixed gas is reduced, the stability of mixed gas scavenging is improved, the scavenging speed is increased, the scavenging direction is stabilized, the power of an engine can be effectively improved, the high-speed stability and the low-speed stability are improved, and the tail gas emission is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiment(s) of the utility model and together with the description serve to explain the utility model without limiting the utility model.
FIG. 1 is a schematic view of the flow of the mixture in an elongated closed scavenging passage;
FIG. 2 is a schematic sectional view of an elongated closed scavenging passage;
FIG. 3 is a schematic view of the scavenging passages in the first crankcase and the second crankcase;
the numbering in the drawings illustrates: 1. a cylinder body; 1a, 1b, a closed scavenging passage on the cylinder body; 2. a first crankcase; 2a, a horizontal scavenging passage on the first crankcase; 2b, a vertical scavenging passage on the first crankcase; 2c, a mixed gas storage cavity on the first crankcase; 3. a second crankcase; 3a, a horizontal scavenging passage on the second crankcase; 3b, a vertical scavenging passage on the second crankcase; 3c, a mixed gas storage cavity on the second crankcase; 4. the closed scavenging passage scavenging port on the cylinder body.
Detailed Description
As shown in fig. 1 to fig. 3, the two-stroke gasoline engine crankcase with a scavenging passage and the closed scavenging passage formed by the cylinder block include a horizontal scavenging passage 2a (3 a), a vertical scavenging passage 2b (3 b), a mixed gas storage chamber 2c (3 c), a closed scavenging passage 1a (1 b) and a closed scavenging passage scavenging port 4 of the cylinder block 1 on a first crankcase 2 (a second crankcase 3).
The horizontal scavenging air passage 2a (3 a), the vertical scavenging air passage 2b (3 b) and the mixed gas storage cavity 2c (3 c) are designed on the first crankcase 2 (the second crankcase 3) and are communicated with each other. The inlets of the mixed gas storage cavity 2c (3 c) and the horizontal scavenging passage 2a (3 a) are designed in the first crankcase 2 (the second crankcase 3) and are communicated with each other. The outlet of the vertical scavenging duct 2b (3 b) is designed on the flange surface of the first crankcase 2 (the second crankcase 3) and is communicated with the closed scavenging duct 1a (1 b) of the cylinder body 1.
As described above, the mixed gas storage chamber 2c (3 c), the horizontal scavenging passage 2a (3 a), the vertical scavenging passage 2b (3 b), and the closed scavenging passage 1a (1 b) of the cylinder 1 are communicated to form a lengthened closed scavenging passage.
The specific working process is as follows: the mixed gas in the crankcase → the mixed gas storage cavity 2c (3 c) → the horizontal scavenging duct 2a (3 a) → the vertical scavenging duct 2b (3 b) → the closed scavenging duct 1a (1 b) → of the cylinder 1 entering the cylinder combustion chamber through the closed scavenging duct scavenging port 4 on the cylinder. To increase the length of the closed scavenging passage.
The beneficial effects are that: the mixed gas in the mixed gas storage cavity enters the horizontal scavenging passage through the horizontal scavenging passage inlet, sequentially passes through the vertical scavenging passage and the closed scavenging passage on the cylinder body, passes through the scavenging port, and finally enters the cylinder body combustion chamber for combustion, so that the length of the closed scavenging passage is increased. Experiments prove that the increase of the length of the closed scavenging passage is beneficial to layering of pure air and mixed gas, the stability of pure air pilot scavenging tail gas is improved, the loss of the mixed gas is reduced, the stability of mixed gas scavenging is improved, the scavenging speed is increased, the scavenging direction is stabilized, the power of an engine can be effectively improved, the high-speed stability and the low-speed stability are improved, and the tail gas emission is reduced.
Although the structure and method for carrying out the present invention have been described in detail, the present invention is not limited thereto, and those skilled in the art can modify the shape, size, and other detailed structure of the embodiments without departing from the scope of the technical idea and purpose of the present invention, and the modifications are included in the present invention.
Claims (2)
1. The utility model provides a two-stroke gasoline engine crankcase with scavenge way which characterized in that: at least one horizontal scavenging passage, at least one vertical scavenging passage and at least one mixed gas storage cavity are designed on the crankcase; the horizontal scavenging passage and the vertical scavenging passage are communicated with the mixed gas storage cavity; the inlet of the horizontal scavenging passage and the mixed gas storage cavity are designed in the crankcase; and the outlet of the vertical scavenging passage is designed on the flange surface of the crankcase and is communicated with the closed scavenging passage of the cylinder body.
2. The two-stroke gasoline engine crankcase with the scavenging passage as claimed in claim 1, wherein: the mixed gas storage cavity, the horizontal scavenging passage and the vertical scavenging passage which are communicated with the crankcase are communicated with the closed scavenging passage on the cylinder body to form a lengthened closed scavenging passage; the mixed gas in the mixed gas storage cavity enters the horizontal scavenging passage through the horizontal scavenging passage inlet, sequentially passes through the vertical scavenging passage and the closed scavenging passage on the cylinder body, and enters the cylinder body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122493378.8U CN216518308U (en) | 2021-10-18 | 2021-10-18 | Two-stroke gasoline engine crankcase with scavenging passage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122493378.8U CN216518308U (en) | 2021-10-18 | 2021-10-18 | Two-stroke gasoline engine crankcase with scavenging passage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216518308U true CN216518308U (en) | 2022-05-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122493378.8U Active CN216518308U (en) | 2021-10-18 | 2021-10-18 | Two-stroke gasoline engine crankcase with scavenging passage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216518308U (en) |
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2021
- 2021-10-18 CN CN202122493378.8U patent/CN216518308U/en active Active
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