CN1043772A - A kind of exhaust muffler for internal combustion engine - Google Patents
A kind of exhaust muffler for internal combustion engine Download PDFInfo
- Publication number
- CN1043772A CN1043772A CN 88105818 CN88105818A CN1043772A CN 1043772 A CN1043772 A CN 1043772A CN 88105818 CN88105818 CN 88105818 CN 88105818 A CN88105818 A CN 88105818A CN 1043772 A CN1043772 A CN 1043772A
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- hole
- core tube
- air
- internal combustion
- combustion engine
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Abstract
A kind of exhaust muffler for internal combustion engine, its maximum characteristics are the dividing plates 10 that are added with frictional damping hole, band center 10a in core tube 2 nearly exhaust entrance sides, and after the core tube 2 of coaxial assembling, tail pipe 6, be provided with coaxial drainage tube (hole) 8, and be added with elastic insert 11 at supporting mass 7 and 1 of housing.When using on two-wheeled motor vehicle, exhaust noise can be reduced to below 80 decibels, and engine power is unaffected.
Description
The present invention relates to a kind of exhaust muffler for internal combustion engine, it belongs to the silencer class that reduces exhaust energy with throttling or eddy current.
A kind of exhaust muffler for internal combustion engine that Japanese Yamaha engine Co., Ltd. produces has as shown in Figure 1, and it contains housing 1, core tube 2 and the tail pipe 6 of coaxial assembling, and tail pipe 6 front ends are through reducing sleeve 5 and 2 sockets of core tube, and supporting mass 7 is partly inserted in the rear end; Be lined with triangular air-flow guiding trestle 3 in the core tube 2 again, almost near the tail pipe 6 of core tube 2 bottoms, front end is then pressed close to the number row friction hole of core tube 2 nearly exhaust entrance sides in the rear end of this triangular air-flow guiding trestle; Several pieces annular dottle pins 4 with or without the frictional damping hole are arranged, 4a, 4b, 4c is with housing 1 and core tube 2, be separated out some expansion cooling chamber I between the tail pipe 6, II, III, IV, have the pore that communicates with adjacent expansion cooling chamber on core tube 2 walls, wherein, except that nearly exhaust entrance side is arranged the small sircle hole for number, remaining hole 12,12a, 12b, 12c ... the spill guide plate 13 that all has oblique sensing housing 1,13a, 13b, 13c ... spill guide plate 13,13a, 13b, 13c ... be the some of core tube 2 wall portions, and have a bit certain the some Joint adjacent digonous at least with triangular air-flow guiding trestle 3; Simultaneously, have in these holes half be oblique before (referring to the exhaust gas intake port direction) open, half is opened after then oblique in addition.After the waste gas that comes from engine exhaust pipe enters this baffler, a part of air-flow on core tube 2 the place ahead walls the frictional damping hole and enter the cooling of I expansion cooling chamber, another part (partly main) is flowed out to the rear portion of core tube 2 by 3 guiding of triangular air-flow guiding trestle, every hole through a band spill guide plate, just expand and shrink once, that is be directed to the flow expansion of adjacent expansion cooling chamber from opening, and first contraction of the air-flow that passes narrow slit between spill guide plate and triangular air-flow guiding trestle afterwards expanded, like this through repeatedly expanding, shrink, add and enter I, II, the incorgruous air-flow of III expansion cooling chamber also has interference effect each other, just greatly reduced to the pressure of the engine exhaust of atmosphere by tail pipe 6 rows at last, noise has also fallen with regard to corresponding.
Practice shows, above-mentioned baffler still has the following disadvantages: the one, and make the outpost of the tax office of air-flow contraction-expansion too many in the core tube, so be drawn towards the central gas stream pressure loss of tail pipe 6 along triangular air-flow guiding trestle 3 bigger than normal, so just reduced the ability of suction engine exhaust in atmosphere, there is the exhaust of delay phenomenon baffler inside as a result, thereby reduced erasure effect, can descend because of temperature rise causes engine power simultaneously; The 2nd, three strands of air-flows introducing along guiding trestle 3 have nothing in common with each other because of the situation of shrinking, expand, and almost are directly oriented to tail pipe 6 again and can cause the association noise to airborne release; The 3rd, be that rigidity contacts between supporting mass 7 and the housing 1, can produce new noise source again when dealing with improperly; Simultaneously, also cumbersome on technology.
Purpose of the present invention is exactly to overcome above-mentioned defective, and exhaust muffler for internal combustion engine a kind of new structure, that efficient is higher is provided.
Technological points of the present invention is: nearly exhaust entrance side is set up dividing plate 10 in core tube 2, and dividing plate 10 centers have frictional damping hole 10a, and significantly minimizing is with the stomatal number of spill guide plate and is replaced narrow annular groove or circular hole simultaneously; Shorten the length of many ribs (being triangular at least) air-flow guiding trestle 3 of core tube 2 liners, make its front end be L apart from dividing plate 10
1, its rear end is L apart from core tube 2 bottoms
2, best L
1=L
2; Set up coaxial with it drainage tube (hole) 8 in tail pipe 6 rear ends, the volume of drainage tube (hole) 8 is about 1/4 of tail pipe 6 volumes; Between supporting mass 7 that includes drainage tube (hole) 8 and housing 1, be provided with the liner of making by elastic flexible material 11.
In practice, make the rib portion of the front and back ends of many ribs air-flow guiding trestle 3 be with chamfering α, β, even string together with a core bar after it is divided into several sections, situation is more better.In addition, the opening direction at the pore of the some band spill guide plates that are communicated with middle part expansion cooling chamber also can be identical.The bore of frictional damping hole 10a preferably is slightly less than the oral pore footpath of drainage tube (hole) 8.
Baffler of the present invention is in when work because porose 10a guiding before the central gas stream, after length is arranged is L
2One section buffer area, significantly reduce again at the outpost of the tax office of passing through in advancing, and the rear portion of tail pipe 6 is added with drainage tube (hole) 8 again, so there is not the problem that has exhaust to be detained in the body, elimination efficiency improves, engine power is also unaffected, does not also exist three strands of air-flows because of the different problems that the association noise takes place of pressure; The flexible resilient liner of setting up between supporting mass 7 and housing makes the 3rd noise source have no way of producing again.So it is both overcome the deficiencies in the prior art point, and also quite convenient on making.
It below is the description of the drawings.
Accompanying drawing 2 is structural representations of a kind of embodiment of the present invention; Accompanying drawing 3 is A-A sectional views in the accompanying drawing 2.Among the figure, 1-housing, 2-core tube, many ribs of 3-air-flow guiding trestle, 4 and 4a, 4b, 4c ...-annular dottle pin, the 5-reducing sleeve, the 6-tail pipe, 7-supporting mass, 8-drainage tube (hole), 9,9a-damping hole, 10-dividing plate, 10a-frictional damping hole, the 11-liner, 12,12a, 12b, 12c ...-pore, 13,13a, 13b, 13c ...-spill guide plate, 14,14a, 14b, the narrow annular groove of 14c-.
Embodiment 1:
Make bafflers and be contained on the two-wheeled motor vehicle by accompanying drawing 2, the check result noise is lower than 80 decibels, and engine power is unaffected.
Embodiment 2:
Present embodiment and embodiment's 1 difference has 2 points, and the one, narrow annular groove 14,14a, 14b, 14c change some small sircle holes without exception into; The 2nd, pore 12,12a, 12b and 12c ... opening direction all identical.The entrucking test, exhaust noise is lower than 78 decibels.Engine power is unaffected.
Embodiment 3:
Respectively make narrow annular groove 14,14a, 14b, 14c into some narrow circumferential welds, the gross area of described narrow circumferential weld should equal original narrow annular groove gross area at least, many ribs air-flow guiding trestle also is arranged to several sections respectively simultaneously, each is intersegmental to be connected in series mutually with core bar, all the other and embodiment 1 are together, the entrucking test, noise is lower than 78 decibels, and engine power is constant.
Claims (4)
1, a kind of exhaust muffler for internal combustion engine, it contains housing 1 and reaches the core tube 2 of coaxial assembling with it, be lined with many ribs air-flow guiding trestle 3 in the core tube 2, annular dottle pin 4 is arranged again between core tube 2 and the housing 1,4a, 4b, 4c ... the space is separated out expansion cooling chamber I, II, III, IV ... core tube 2 rear portions are furnished with tail pipe 6 by reducing sleeve 5 is coaxial, described core tube 2, all have on tail pipe 6 walls air flue respectively with expansion cooling chamber I, II, III, IV ... communicate, and the annular dottle pin 4 of nearly exhaust entrance side, also have frictional damping hole 9 on the 4a, 9a makes the intercommunication of adjacent expansion cooling chamber, it is characterized in that:
1. the also coaxial drainage tube (hole) 8 that is provided with in above-mentioned tail pipe 6 backs, drainage tube (hole) 8 is located at the middle part portion of supporting mass 7, and the volume ratio of described tail pipe 6 and drainage tube (hole) 8 is about 4: 1;
2. be provided with the dividing plate 10 of frictional damping hole, band center 10a in the described core tube 2 by exhaust gas intake port place;
3. end distance dividing plate 10 is L before described many ribs air-flow guiding trestle 3
1, the rear end is L apart from the bottom of core tube 2
2, and best L
1=L
2
4. the air flue that is communicated with adjacent expansion cooling chamber on described core tube 2 walls is hole and/or narrow annular groove, air flue 12,12a, 12b, the 12c that communicates with middle part expansion cooling chamber wherein ... open respectively corresponding to the position between many ribs air-flow guiding trestle 3 adjacent two ribs, and the spill guide plate 13,13a, 13b, the 13c that have oblique sensing housing 1 ..., guide plate 13,13a, 13b, 13c ... (being the some of core barrel) all has at least a bit and certain the some Joint between 3 liang of adjacent ribs of many ribs air-flow guiding trestle;
5. be provided with the liner of making by elastic flexible material 11 between described supporting mass 7 that contains drainage tube (hole) 8 and the housing 1.
According to the described a kind of exhaust muffler for internal combustion engine of claim 1, it is characterized in that 2, the rib number of described many ribs air-flow guiding trestle 3 is at least 3, and the rib portion of its front and back ends has chamfering α, β.
3, according to claim 1 or 2 described a kind of exhaust muffler for internal combustion engine, it is characterized in that described frictional damping hole 12,12a, 12b, 12c ... opening to point to can be identical.
4, according to claim 1,2,3 described a kind of exhaust muffler for internal combustion engine, it is characterized in that the aperture of described frictional damping hole 10a preferably is slightly less than the aperture of drainage tube (hole) 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88105818 CN1043772A (en) | 1988-12-23 | 1988-12-23 | A kind of exhaust muffler for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88105818 CN1043772A (en) | 1988-12-23 | 1988-12-23 | A kind of exhaust muffler for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1043772A true CN1043772A (en) | 1990-07-11 |
Family
ID=4833960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88105818 Pending CN1043772A (en) | 1988-12-23 | 1988-12-23 | A kind of exhaust muffler for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1043772A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100378300C (en) * | 2006-03-02 | 2008-04-02 | 重庆隆鑫工业（集团）有限公司 | Motorcycle silencer |
| CN1889791B (en) * | 2005-06-28 | 2010-12-15 | 宋行智 | Passive continuous variable damping device |
| CN101238307B (en) * | 2005-08-08 | 2011-06-08 | 开利公司 | Absorptive muffler assembly of compressor assembly and method |
| CN112412804A (en) * | 2020-10-13 | 2021-02-26 | 珠海格力节能环保制冷技术研究中心有限公司 | Compound air suction port and air exhaust port silencing assembly and compressor |
-
1988
- 1988-12-23 CN CN 88105818 patent/CN1043772A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1889791B (en) * | 2005-06-28 | 2010-12-15 | 宋行智 | Passive continuous variable damping device |
| CN101238307B (en) * | 2005-08-08 | 2011-06-08 | 开利公司 | Absorptive muffler assembly of compressor assembly and method |
| CN100378300C (en) * | 2006-03-02 | 2008-04-02 | 重庆隆鑫工业（集团）有限公司 | Motorcycle silencer |
| CN112412804A (en) * | 2020-10-13 | 2021-02-26 | 珠海格力节能环保制冷技术研究中心有限公司 | Compound air suction port and air exhaust port silencing assembly and compressor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |