EP1403496B1 - Moteur à combustion interne avec refroidissement par air - Google Patents
Moteur à combustion interne avec refroidissement par air Download PDFInfo
- Publication number
- EP1403496B1 EP1403496B1 EP03103501A EP03103501A EP1403496B1 EP 1403496 B1 EP1403496 B1 EP 1403496B1 EP 03103501 A EP03103501 A EP 03103501A EP 03103501 A EP03103501 A EP 03103501A EP 1403496 B1 EP1403496 B1 EP 1403496B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cooling air
- air passage
- internal combustion
- combustion engine
- fore
- 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.)
- Expired - Lifetime
Links
- 238000002485 combustion reaction Methods 0.000 title claims description 37
- 238000001816 cooling Methods 0.000 claims description 53
- 238000004891 communication Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000013021 overheating Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- UQMRAFJOBWOFNS-UHFFFAOYSA-N butyl 2-(2,4-dichlorophenoxy)acetate Chemical compound CCCCOC(=O)COC1=CC=C(Cl)C=C1Cl UQMRAFJOBWOFNS-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
Images
Classifications
-
- 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
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/26—Cylinder heads having cooling means
- F02F1/28—Cylinder heads having cooling means for air cooling
- F02F1/30—Finned cylinder heads
- F02F1/32—Finned cylinder heads the cylinder heads being of overhead valve type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
- F02B61/02—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P1/00—Air cooling
- F01P1/02—Arrangements for cooling cylinders or cylinder heads, e.g. ducting cooling-air from its pressure source to cylinders or along cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P1/00—Air cooling
- F01P1/06—Arrangements for cooling other engine or machine parts
- F01P1/10—Arrangements for cooling other engine or machine parts for cooling fuel injectors or sparking-plugs
-
- 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
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
Definitions
- the present invention relates to a cooling air passage for an air-cooled internal combustion engine mounted on a motorcycle and the like.
- an air-cooled internal combustion engine in the related art having the following structure.
- this internal combustion engine includes two exhaust ports and two exhaust valves corresponding thereto disposed side by side at the front portion of a cylinder head, and two intake ports and two intake valves corresponding thereto disposed also side by side at the rear portion thereof, an ignition plug disposed at the position surrounded by the aforementioned four valves, a laterally oriented camshaft disposed between a cylinder head and a cylinder head cover, a cooling air passage passing between the two exhaust valves and between the two intake valves, and then through the cylinder head in the fore-and-aft direction, and a laterally extending cooling air passage in communication with the aforementioned cooling air passage extending in the fore-and-aft direction (for example, see Patent Document 1).
- an ignition plug mounting hole surrounding the body of the ignition plug with a clearance left therebetween is formed on the cylinder head, and the ignition plug mounting hole communicates with the aforementioned cooling air passage extending in the fore-and-aft direction.
- part of incoming air is flown out upwardly of the internal combustion engine from the aforementioned ignition plug mounting hole, another part of air is flown out toward the side of the internal combustion engine from the laterally extending cooling air passage, and remaining part of air is flown out rearward from a rear opening of the cooling air passage extending in the fore-an-aft direction.
- the cylinder head and the ignition plug is cooled.
- EP-A-845 583 and JP-B-43050 (Fig.2, Fig. 3) are related to that prior art. Problems to be solved by the Invention In the related art, the effect of air-cooling in the cooling air passage is not sufficient. In addition, mounting and dismounting of the ignition plug is not easy.
- the present invention is intended to improve air-cooling effect in the cooling air passage, to provide the ignition plug at such position that enables easy mounting and dismounting while enabling the effective air-cooling thereof. Means for Solving the Problems and Advantages
- the present invention contributes to solve the aforementioned problems, by the features according to Claim 1
- the present invention is constructed as described above and the cooling fin is provided in the cooling air passage above the combustion chamber, the portion around the combustion chamber may be effectively cooled. Since the ignition plug is provided in the laterally extending cooling air passage, and the cooling fin is curved so as to guide a cooling air toward the ignition plug, overheating of the ignition plug may be prevented.
- the embodiment according to Claim 2 is an air- cooled internal combustion engine as set forth in Claim 1, characterized in that the centreline of the aforementioned exhaust port is inclined with respect to the fore-and-aft direction of he internal combustion engine so as to broaden the front opening of the aforementioned cooling air passage extending in the fore-and-aft direction.
- Fig. 1 is a vertical cross sectional view of a principal portion of an air-cooled internal combustion engine 1 according to one embodiment of he present invention, showing the upper portion of an OHC (overhead camshaft) single cylinder internal combustion engine.
- an arrow F represents the front.
- an outer shell of the principal portion of an internal combustion engine 1 includes a cylinder block 2, a cylinder head 3, and a cylinder head cover 4.
- a combustion chamber 6 is formed on the bottom face side of the cylinder head 3.
- the cylinder head 3 is formed with an exhaust port 7 and an intake port 9 communicating with the combustion chamber 6.
- the exhaust port 7 is provided with an exhaust valve 8 at the inner end thereof for opening and closing the port.
- An exhaust pipe, not shown, is continuing form the outer end at the exhaust port 7.
- the intake port 9 is provided with an intake valve 10 at his inner end thereof for opening and closing the port.
- a carburettor is connected to the outer end of he intake port 9.
- the exhaust valve 8 is provided so that a shaft portion 8a thereof is inclined forwardly of the cylinder head 3, and a valve spring 11 for urging the exhaust valve 8 in the direction to close the exhaust valve 8 is attached on the upper projection of the shaft portion 8a.
- the intake valve 10 is provided so that a shaft portion 10a thereof inclines rearward of the cylinder head 3, and a valve spring 12 for urging the intake valve 10 in the direction of closing is attached on the upper projection of the shaft portion 10a.
- a valve gear chamber 13 is formed by the cylinder head 3 and the cylinder head cover 4, and a valve gear mechanism for opening and closing the aforementioned exhaust valve 8 and the intake valve 10 are stored therein.
- An exhaust cam 15 for opening and closing the exhaust valve 8 and an intake cam 16 for opening and closing the intake valve 10 are formed on the camshaft 14.
- a exhaust rocker arm 17 is pivotably supported above the exhaust valve 8 by a rocker exhaust arm shaft 18. One end thereof is in contact with the upper end of the shaft portion 8a of the exhaust valve via a tappet 19, and the other end thereof is in contact with the exhaust cam 15 via an exhaust roller 21 supported by a roller shaft 20.
- An intake rocker arm 22 is pivotably supported by an intake rocker arm shaft 23 above the intake valve 10. One end thereof is in contact with the upper end of the shaft portion 10a of the intake valve via a tappet 24, and the other end is in contact with an intake cam 16 via an intake roller 26 supported by a roller shaft 25.
- Fig. 2 is a lateral cross section of a principle portion of the aforementioned internal combustion engine 1.
- the cylinder head 3 is attached with an ignition plug 27 on the right side thereof, and an electrode 27a at the distal end thereof projects into the combustion chamber 6.
- One end of the camshaft 14 projects. into a chain chamber 28, on which a driven sprocket 29 is secured.
- a drive sprocket (not shown) is secured on the crankshaft and a cam chain 30 is put around the aforementioned drive sprocket and the driven sprocket 29.
- the camshaft 14 is rotated via the cam chain 30.
- Fig. 3 is a cross sectional view taken along the line III-III in Fig. 2, showing a horizontal cross section of the cylinder head of the aforementioned internal combustion engine.
- An arrow F indicates the front.
- a cooling air passage extending in the fore-and-aft direction 32 passes through the cylinder head in the fore-and-aft direction is formed along a peripheral wall 28a of the chain chamber 28 on the side of the center of the cylinder head.
- a space interposed between the peripheral wall 28a of the chain chamber and a peripheral wall 7a of the exhaust port is a front opening 33
- a space interposed between the peripheral wall 28a of the chain chamber and a peripheral wall 9a of the intake port is a rear opening 34.
- Formed on both sides of the ignition plug mounting portion 31 is a side opening 36.
- the centerline A of the exhaust port 7 is inclined by an angle ⁇ with respect to the fore-and-aft direction B of the internal combustion engine toward the direction to broaden the front opening 33, so that the opening area of the front opening 33 is increased and thus a large quantity of air is introduced into the cooling air passage.
- Three cooling fins are formed at the connecting portion between the cooling air passage 32 extending in the fore-and-aft direction and the laterally extending cooling air passage 35, and within the laterally extending cooling air passage 35 . They are a front fin 37, a middle fin 38, and a rear fin 39.
- the shadowed portions of the middle fin 38 and the rear fin 39 in the figure are thicker and higher portions having increased thickness for reinforcement, and the top portions continue to the ceiling of the cooling air passage.
- Fig. 4 is a perspective view of the aforementioned cooling fins when viewed from the rear obliquely upside.
- the shadowed portions of the middle fin 38 and the rear fin 39 at the top thereof are cross sections of the top portions of the thicker and higher portions 38a and 39a continuing to the ceiling of the cooling air passage.
- a cross sectional view showing three fins is shown in the laterally extending cooling air passage 35.
- the aforementioned three fins provided in the cooling air passage are shown as they are viewed from the backside of the internal combustion engine.
- the construction of the air-cooled internal combustion engine of the present invention is as described above. Against wind is generated when a motorcycle is traveling having the present internal combustion engine mounted thereon, and the against wind generated by traveling flows from the front opening 33 of the cooling air passage 32 extending in the fore-and-aft direction, part of which passed through the laterally extending cooling air passage 35 and then both side of the ignition plug 27, and flown out from the side opening 36 by the guiding action of the three fins. Another part thereof passes between three fins, and flown out from the rear opening 34 of the cooling air passage 32 extending in the fore-and-aft direction.
- An outer wall surface of the cylinder head facing toward the cooling air passage 32 extending in the fore-and-aft direction and the laterally extending cooling air passage 35 is cooled by against wind generated by traveling during travel of the vehicle.
- high temperatures in the combustion chamber 6 is conducted to the front, middle, and rear fins 37, 38, and 39 via a top outer shell 40 of the combustion chamber (Fig. 2), and cooled down by cooing air flowing in the fore-and-aft direction, and cooling air flowing in the lateral direction.
- the ignition plug of the present invention is provided in the laterally extending cooling air passage in a slanted state, it can be dismounted easily from the side of the internal combustion engine, and thus maintenanceability is improved.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Claims (2)
- Moteur à combustion interne à refroidisseur d'air comprenant :un mécanisme de commande de soupape prévu au-dessus d'une chambre de combustion ; etun passage d'air de refroidissement s'étendant dans la direction avant et arrière entre ladite chambre de combustion et ledit mécanisme de commande de soupape le long d'un orifice d'échappement et d'un orifice d'admission,caractérisé en ce qu'un passage d'air de refroidissement s'étendant latéralement en communication avec ledit passage d'air de refroidissement s'étendant dans la direction avant et arrière est prévu entre lesdits orifice d'échappement et orifice d'admission, une bougie d'allumage est prévue dans le passage d'air de refroidissement s'étendant latéralement, et il est prévu une ailette de refroidissement incurvée depuis ledit passage d'air de refroidissement s'étendant dans la direction avant et arrière vers ledit passage d'air de refroidissement s'étendant latéralement.
- Moteur à combustion interne refroidi par l'air selon la revendication 1, caractérisé en ce qu'une ligne médiane dudit orifice d'échappement est inclinée par rapport à la direction avant et arrière d'un moteur à combustion interne de manière à élargir une ouverture frontale dudit passage d'air de refroidissement s'étendant dans la direction avant et arrière.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002276924 | 2002-09-24 | ||
JP2002276924 | 2002-09-24 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1403496A1 EP1403496A1 (fr) | 2004-03-31 |
EP1403496B1 true EP1403496B1 (fr) | 2007-11-14 |
Family
ID=31973231
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03103501A Expired - Lifetime EP1403496B1 (fr) | 2002-09-24 | 2003-09-22 | Moteur à combustion interne avec refroidissement par air |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1403496B1 (fr) |
KR (1) | KR100569164B1 (fr) |
CN (1) | CN100526631C (fr) |
BR (1) | BR0304160A (fr) |
ES (1) | ES2295513T3 (fr) |
MX (1) | MXPA03008260A (fr) |
TW (1) | TWI221877B (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9534528B2 (en) | 2011-12-07 | 2017-01-03 | Andreas Stihl Ag & Co. Kg | Internal combustion engine with fuel system |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4327771B2 (ja) | 2005-06-23 | 2009-09-09 | 本田技研工業株式会社 | 空冷エンジン |
JP5479965B2 (ja) * | 2010-03-23 | 2014-04-23 | 本田技研工業株式会社 | 車両用エンジンにおける点火プラグ冷却装置 |
TWI381093B (zh) * | 2011-02-21 | 2013-01-01 | Kwang Yang Motor Co | Air Cooling Engine 's Cylinder Head Heat Dissipation |
EP2410164A3 (fr) * | 2010-07-19 | 2012-10-10 | Kwang Yang Motor Co., Ltd. | Structure de tête de cylindre de moteur de refroidissement d'air |
CN102312718B (zh) * | 2011-03-14 | 2014-12-10 | 隆鑫通用动力股份有限公司 | 通用汽油机 |
CN102312750A (zh) * | 2011-03-14 | 2012-01-11 | 隆鑫通用动力股份有限公司 | 汽油机风冷缸头及其汽油机 |
DE102011120464A1 (de) * | 2011-12-07 | 2013-06-13 | Andreas Stihl Ag & Co. Kg | Arbeitsgerät |
TWI454616B (zh) * | 2012-08-22 | 2014-10-01 | Kwang Yang Motor Co | Engine heat dissipation of cylinder head |
JP2014070621A (ja) * | 2012-10-01 | 2014-04-21 | Yamaha Motor Co Ltd | 空冷式内燃機関およびそれを備えた鞍乗型車両 |
CN105201612B (zh) * | 2014-06-10 | 2018-08-07 | 光阳工业股份有限公司 | 摩托车的引擎导风结构 |
JP6900418B2 (ja) * | 2019-03-29 | 2021-07-07 | 本田技研工業株式会社 | 内燃機関 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5301641A (en) * | 1991-11-06 | 1994-04-12 | Honda Giken Kogyo Kabushiki Kaisha | Internal combustion engine |
JPH10159510A (ja) * | 1996-11-29 | 1998-06-16 | Kawasaki Heavy Ind Ltd | オーバヘッドバルブ型エンジンの弁構造 |
TW358848B (en) * | 1997-06-25 | 1999-05-21 | Mitsubishi Heavy Ind Ltd | Structure of overhead-valve internal combustion engine and manufacturing method for the same |
-
2003
- 2003-08-28 KR KR1020030059868A patent/KR100569164B1/ko not_active IP Right Cessation
- 2003-09-02 TW TW092124229A patent/TWI221877B/zh not_active IP Right Cessation
- 2003-09-12 MX MXPA03008260A patent/MXPA03008260A/es active IP Right Grant
- 2003-09-15 CN CNB031588646A patent/CN100526631C/zh not_active Expired - Fee Related
- 2003-09-17 BR BR0304160-3A patent/BR0304160A/pt not_active Application Discontinuation
- 2003-09-22 ES ES03103501T patent/ES2295513T3/es not_active Expired - Lifetime
- 2003-09-22 EP EP03103501A patent/EP1403496B1/fr not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9534528B2 (en) | 2011-12-07 | 2017-01-03 | Andreas Stihl Ag & Co. Kg | Internal combustion engine with fuel system |
Also Published As
Publication number | Publication date |
---|---|
CN100526631C (zh) | 2009-08-12 |
TW200409859A (en) | 2004-06-16 |
EP1403496A1 (fr) | 2004-03-31 |
ES2295513T3 (es) | 2008-04-16 |
MXPA03008260A (es) | 2004-09-03 |
CN1497158A (zh) | 2004-05-19 |
BR0304160A (pt) | 2004-08-31 |
KR100569164B1 (ko) | 2006-04-07 |
KR20040026599A (ko) | 2004-03-31 |
TWI221877B (en) | 2004-10-11 |
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