EP0604937B1 - A shroud for an air-cooled internal combustion engine - Google Patents

A shroud for an air-cooled internal combustion engine Download PDF

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Publication number
EP0604937B1
EP0604937B1 EP93120921A EP93120921A EP0604937B1 EP 0604937 B1 EP0604937 B1 EP 0604937B1 EP 93120921 A EP93120921 A EP 93120921A EP 93120921 A EP93120921 A EP 93120921A EP 0604937 B1 EP0604937 B1 EP 0604937B1
Authority
EP
European Patent Office
Prior art keywords
shroud
fins
louver
cooling air
internal combustion
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
Application number
EP93120921A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0604937A1 (en
Inventor
Shinji c/o KK HONDA GIJUTSU KENKYUSHO Kuga
Tomoyuki C/O Kk Honda Gijutsu Kenkyusho Wakatake
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Publication of EP0604937A1 publication Critical patent/EP0604937A1/en
Application granted granted Critical
Publication of EP0604937B1 publication Critical patent/EP0604937B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/12—Filtering, cooling, or silencing cooling-air
    • 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
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/11—Thermal or acoustic insulation
    • F02B77/13—Acoustic insulation
    • 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
    • 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
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
    • F01P5/06—Guiding or ducting air to, or from, ducted fans
    • 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
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
    • 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

Definitions

  • the present invention relates to a shroud for an air-cooled type internal combustion engine, of the kind defined in the preamble of claim 1.
  • FR-A-2 479 324 discloses a shroud of this kind for use in the front engine bonnet of agricultural or earth-moving machines.
  • the shroud comprises a sandwich arrangement including an outer and a inner structure or panel made of a foamed or cellular material, and an intermediate stiffening wall member.
  • the said outer and inner panels are provided with respective pluralities of parallel cylindrical apertures having different directions of inclination.
  • US-A-4 546 843 discloses a side cover structure for the engine compartment of a motor-cycle provided with a plurality of sloping slats.
  • a louver comprising fins which are arranged in parallel vertically at predetermined intervals and which are inclined from above to below in the outside direction from the inside, is provided in the cooling air intake opening of the shroud, as illustrated in Japanese Utility Model Publication No. 32903/88, in order to attain noise insulation and prevent outside rain water from entering the shroud.
  • an inner louver is mounted integrally with the shroud, and outside the inner louver there is detachably mounted a separate, outer louver having fins arranged on an extension plane of the inner louver fins, for enlarging the fin width at low cost.
  • a separate, outer louver having fins arranged on an extension plane of the inner louver fins, for enlarging the fin width at low cost.
  • the present invention aims at providing an improvement in the structure of a shroud of the previously defined kind.
  • the direction of inclination of the outer louver and that of the inner louver are made different from each other, most of the acoustic waves of noise generated from the internal combustion engine and that from the cooling fan are intercepted by the inner louver, and the acoustic waves of noise which have passed between the fins of the inner louver are intercepted by the outer louver which is inclined in a different direction from the inner louver, thus resulting in that there is obtained a satisfactory noise insulating effect.
  • a swing type power unit 2 mounted on a scooter type two-wheeled motor vehicle 1 comprises an air-cooled type internal combustion engine 3 standing up in a slightly obliquely downwardly inclined state and a V belt type stepless (infinitely variable) speed change mechanism 4 extending backward from one lower side of the engine 3, the engine 3 and the speed change mechanism 4 being integrally coupled together.
  • a rear wheel 5 is integrally fitted on an output shaft (not shown) of the V belt type stepless speed change mechanism 4, and a hanger portion 6 positioned in the front portion of the swing type power unit 2 is attached vertically swingably to a bracket 8 which is projecting backward from a body 7 of the scooter type two-wheeled motor vehicle 1.
  • a crank shaft 10 is supported rotatably within a crank case 9 of the engine 3, and a driving variable pulley 11 of the stepless speed change mechanism 4 is mounted on the leftmost end of the crank shaft 10.
  • a V belt 13 is entrained around the driving variable pulley 11 and a driven variable pulley (not shown) is journaled in the rear portion of a transmission case 12.
  • a cylinder 14 located above the crank case 9 and a cylinder head 15 above the cylinder are formed with a large number of radiation fins 16 at predetermined intervals.
  • a rotor 18 of a generator 17 is integrally fitted on the rightmost end of the crank shaft 10, and a centrifugal type cooling fan 19 is integrally mounted to the rotor 18.
  • the air-cooled type internal combustion engine 3 and the cooling fan 19 are covered with a shroud 20 made (for example) of a synthetic resin.
  • the shroud 20 comprises a cylinder-side shroud 21 which covers the cooling fan 19 and the cylinder 14 of the engine 3, a head-side shroud 22 which covers the cylinder head 15, and a shroud outer plate 23 which covers the outside of the cylinder-side shroud 21.
  • the cylinder-side shroud 21 and the head-side shroud 22 are mounted to the crank case 9, cylinder 14, etc. removably, with with mounting bolts 24.
  • a cylindrical opening 25 which is concentric with the cooling fan 19, and an inner louver 26 is formed in the cylindrical opening 25.
  • the inner louver 26 comprises wide fins 27 inclined from the rear to the front in the outside direction from the inside and arranged longitudinally at wide intervals.
  • a cylindrical side opening 28 projecting outwards in close contact with the outer peripheral surface of the cylindrical opening 25 of the cylinder-side shroud 21.
  • an outer louver 29 is formed in the cylindrical opening 28.
  • the outer louver 29 comprises relatively narrow fins 30 inclined from above to below in the outside direction from the inside and arranged vertically at narrow intervals.
  • the cylinder-side shroud 21 is formed with side mounting seats 31 projecting outwards.
  • the mounting seats 31 are formed one in an upper position and two in lower positions.
  • the shroud outer plate 23 is also formed with inwardly projecting mounting seats 32 in positions corresponding to the positions of the mounting seats 31.
  • a noise absorbing material 33 such as polyurethane sponge is interposed between the cylinder-side shroud 21 and the shroud outer plate 23 and throughout the whole side face with the exclusion of the cylindrical openings 25 and 28. Rivets 34 are fitted in the mounting seats 31 and 32 to couple the cylinder-side shroud 21 and the shroud outer plate 23 integrally with each other.
  • cooling air is introduced into the shroud 20 from the cylindrical opening 28 of the shroud outer plate 23 through the cylindrical opening 25 of the cylinder-shroud 21. During this period, the cooling air flows to the cylinder head 15 side while in contact with the radiation fins 16 and is thereafter discharged into the atmosphere from a cooling air discharge port 35 formed in a left-hand rear position of the head-side shroud 22.
  • the illustrated embodiment is constructed as above, when the air-cooled type internal combustion engine 3 starts operating and the cooling fan 19 is rotated, the outside air present on the right-hand side of the swing type power unit 2 is introduced into the cooling air passage 38 in the shroud 20 from the cylindrical opening 28 of the shroud outer plate 23 through the cylindrical opening 25 of the cylinder-side shroud 21, then while being heated by contact with the radiation fins 16 of the cylinder 14 and cylinder head 15, it is discharged to the outside of the shroud 20 through the cooling air discharge port 35.
  • the fins 27 of the inner louver 26 and the fins 30 of the outer louver 29 are inclined in directions different from each other, the acoustic waves of noise which have passed between the fins 27 of the inner louver are changed in their travelling direction by the fins 30 of the outer louver 29, so that the noise insulating effect is improved and the level of the noise generated from the engine 3 and the cooling fan 19 can be further reduced.
  • the fins 30 of the outer louver 29 are inclined from above to below in the outside direction from the inside, rain water descending from above is allowed to drop to the exterior of the vehicle from the lower edges of the fins 30 and thus it is possible to prevent the entry of rain water into the cooling air passage 38.
  • the fins 27 of the inner louver 26 are inclined from the rear to the front in the outside direction from the inside, the wind which has flowed from the front toward the rear on the right-hand side of the swing type power unit 2 and passed between the fins 30 of the outer louver 29 can be introduced positively into the cooling air passage 38.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Automatic Cycles, And Cycles In General (AREA)
EP93120921A 1992-12-28 1993-12-27 A shroud for an air-cooled internal combustion engine Expired - Lifetime EP0604937B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP04358734A JP3140231B2 (ja) 1992-12-28 1992-12-28 車両用空冷式内燃機関の冷却風取入用シュラウド開口構造
JP358734/92 1992-12-28

Publications (2)

Publication Number Publication Date
EP0604937A1 EP0604937A1 (en) 1994-07-06
EP0604937B1 true EP0604937B1 (en) 1997-04-09

Family

ID=18460842

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93120921A Expired - Lifetime EP0604937B1 (en) 1992-12-28 1993-12-27 A shroud for an air-cooled internal combustion engine

Country Status (6)

Country Link
EP (1) EP0604937B1 (es)
JP (1) JP3140231B2 (es)
KR (1) KR960012131B1 (es)
CN (1) CN1032708C (es)
ES (1) ES2101209T3 (es)
TW (1) TW249830B (es)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4280358B2 (ja) * 1999-05-31 2009-06-17 本田技研工業株式会社 ルーバー付きカバーおよびカバー成形用金型装置並びにエンジン
JP2004116375A (ja) * 2002-09-25 2004-04-15 Yamaha Motor Co Ltd 自動二輪車用強制空冷式エンジンの遮音構造
JP4407925B2 (ja) * 2004-07-14 2010-02-03 本田技研工業株式会社 冷却ファンを備える冷却装置
JP2006290295A (ja) * 2005-04-14 2006-10-26 Yamaha Motor Co Ltd 鞍乗型車両
JP4504261B2 (ja) * 2005-06-23 2010-07-14 本田技研工業株式会社 傾斜シリンダ付き空冷エンジン
CN100348846C (zh) * 2005-09-30 2007-11-14 无锡开普动力有限公司 一种风冷柴油机
WO2015163476A1 (ja) * 2014-04-25 2015-10-29 ヤマハモーターパワープロダクツ株式会社 エンジン
JP6038844B2 (ja) * 2014-06-26 2016-12-07 本田技研工業株式会社 鞍乗型車両用内燃機関の冷却装置
CN104843104B (zh) * 2015-05-15 2019-01-25 张素宝 一种铁路t型梁专用运输设备
MX2018001383A (es) * 2017-02-01 2018-11-29 Tvs Motor Co Ltd Un sistema de enfriamiento para un motor de combustion interna.
CN109973196B (zh) * 2017-12-28 2022-12-23 Tvs电机股份有限公司 用于内燃发动机的冷却系统
CN112196654A (zh) * 2020-10-13 2021-01-08 江门市大长江集团有限公司 辅助冷却结构、发动机及摩托车

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1551362A (en) * 1975-04-28 1979-08-30 Komatsu Mfg Co Ltd Radiator assembly
DE3011673C2 (de) * 1980-03-26 1982-06-09 Deere & Co., Moline, Ill., US, Niederlassung Deere & Co. European Office, 6800 Mannheim Land- oder Baumaschine
JPS5945268U (ja) * 1982-09-20 1984-03-26 本田技研工業株式会社 自動二輪車等の通気装置
JPS61258916A (ja) * 1985-05-10 1986-11-17 Kawasaki Heavy Ind Ltd 強制空冷エンジン

Also Published As

Publication number Publication date
CN1096849A (zh) 1994-12-28
ES2101209T3 (es) 1997-07-01
JP3140231B2 (ja) 2001-03-05
CN1032708C (zh) 1996-09-04
TW249830B (es) 1995-06-21
EP0604937A1 (en) 1994-07-06
JPH06200757A (ja) 1994-07-19
KR940015169A (ko) 1994-07-20
KR960012131B1 (ko) 1996-09-16

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