EP0730087B1 - Mounting structure of vibration isolating member to shroud - Google Patents

Mounting structure of vibration isolating member to shroud Download PDF

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Publication number
EP0730087B1
EP0730087B1 EP96102922A EP96102922A EP0730087B1 EP 0730087 B1 EP0730087 B1 EP 0730087B1 EP 96102922 A EP96102922 A EP 96102922A EP 96102922 A EP96102922 A EP 96102922A EP 0730087 B1 EP0730087 B1 EP 0730087B1
Authority
EP
European Patent Office
Prior art keywords
shroud
isolating member
vibration isolating
projections
mounting
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
EP96102922A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0730087A1 (en
Inventor
Kaoru c/o Kabushiki Kaisha Hanawa
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 EP0730087A1 publication Critical patent/EP0730087A1/en
Application granted granted Critical
Publication of EP0730087B1 publication Critical patent/EP0730087B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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

Definitions

  • the present invention relates to a structure for mounting a vibration isolating member on a shroud provided so as to cover an air-cooled engine for a motorcycle or the like.
  • the vibration isolating member is formed with projections, and the projections are forced into engaging holes formed through the shroud, thereby mounting the vibration isolating member to the shroud.
  • the vibration isolating member In the former method of sandwiching the vibration isolating member as disclosed in the above publication, it is sometimes troublesome to precisely position the vibration isolating member. On the other hand, in the latter method of forming the projections on the vibration isolating member, the vibration isolating member must be formed integrally with the projections by using a mold, causing an increase in cost. Furthermore, since the projections are formed of an elastic material, it is sometimes troublesome to mount the vibration isolating member to the shroud.
  • the projections are formed on the inner surface of the shroud, and the mounting holes to be engaged with the projections are formed through the vibration isolating member.
  • the vibration isolating member can be mounted on the shroud by forcing the projections of the shroud into the mounting holes preliminarily formed through the vibration isolating member.
  • the projections are integral with the shroud and are relatively rigid, whereas the mounting holes are formed through the vibration isolating member which is an elastic member. Accordingly, the projections can be easily forced into the mounting holes, so that the vibration isolating member can be mounted on the shroud quickly and simply. Furthermore, since the vibration isolating member can be temporarily mounted on the shroud as mentioned above, the vibration isolating member can be precisely positioned.
  • the vibration isolating member must only be formed with the mounting holes. Accordingly, the mounting holes can be formed simultaneously with or after the step of forming the vibration isolating member from a platelike stock. Further, unlike the prior art, it is unnecessary to use an expensive mold including portions for molding projections in forming the vibration isolating member.
  • FIG. 1 is an enlarged sectional view of an essential part according to a preferred embodiment of the present invention.
  • FIG. 2 is a horizontal sectional view of a swing type power unit according to the preferred embodiment.
  • FIG. 3 is a plan view of a vibration isolating member.
  • FIG. 4 is a plan view of a shroud.
  • FIG. 2 is a horizontal sectional view of a swing type power unit for a scooter.
  • the swing type power unit is provided with a two-cycle engine 1, a V-belt transmission 4 connected to one end of a crankshaft 3 traversing a crankcase 2, and a forced-air cooling fan 5 mounted on the other end of the crankshaft 3.
  • the forced-air cooling fan 5 is surrounded by a duct cover 6.
  • a cylinder 7 and a cylinder head 8 of the two-cycle engine 1 are surrounded by a shroud 9.
  • a vibration isolating member 10 is mounted on the inner surface of the shroud 9.
  • the duct cover 6 and the shroud 9 are continuously connected, so that the outside air taken from slits of the duct cover 6 is fed to around the cylinder 7 and the cylinder head 8 inside the duct cover 6 and the shroud 9 by the forced-air cooling fan 5 as shown by the arrows in FIG. 2, thereby forcibly cooling the cylinder 7 and the cylinder head 8.
  • FIG. 1 is an enlarged sectional view of a portion surrounding the cylinder head 8, in which the cross section of the shroud 9 is taken substantially along the line 1-1 in FIG. 4.
  • FIG. 3 is a plan view of the vibration isolating member 10
  • FIG. 4 is a plan view of the shroud 9.
  • the shroud 9 is formed at its top with a plug hole 12 for allowing insertion of a plug 11, and also with a plurality of bolt insert holes 15 for allowing insertion of bolts 14 for mounting the shroud 9 to bosses 13 of the cylinder head 8.
  • a rubber seal 16 is preliminarily mounted on each bolt 14, so that after the bolts 14 have been inserted through the respective bolt insert holes 15 and secured to the respective bosses 13, the bolt insert holes 15 are automatically sealed by the respective rubber seals 16.
  • the shroud 9 is integrally formed with a plurality of (four in this preferred embodiment) projections 17 projecting downward from the inner surface of the shroud 9 (i.e., toward the cylinder head 8).
  • the projections 17 are so located as to surround the plug hole 12.
  • the shroud 9 is formed by molding a suitable synthetic resin.
  • the vibration isolating member 10 is formed of a suitable elastic material such as rubber, and has a platelike shape and a size enough to cover the top portion of the cylinder head 8.
  • the vibration isolating member 10 is formed with a plug hole 18, bolt insert holes 19, and mounting holes 20 respectively corresponding to the plug hole 12, the bolt insert holes 15, and the projections 17 of the shroud 9.
  • Reference numerals 21 denote escape portions cut out to insert bolts.
  • Each mounting hole 20 is smaller in diameter than each projection 17, so that when each projection 17 is forced into the corresponding mounting hole 20, the diameter of each mounting hole 20 is enlarged by elastic deformation of the vibration isolating member 10, and simultaneously each projection 17 is held within the corresponding mounting hole 20 by the elastic restoring force of the vibration isolating member 10.
  • the vibration isolating member 10 can be temporarily mounted on the inner surface of the shroud 9.
  • the vibration isolating member 10 When the shroud 9 with the vibration isolating member 10 is mounted around the two-cycle engine 1, the vibration isolating member 10 temporarily mounted on the inner surface of the shroud 9 is held between the shroud 9 and a plurality of fins 22 formed on the cylinder head 8 so as to project in parallel to each other toward the shroud 9.
  • the vibration isolating member 10 is placed on the inner surface of the shroud 9 before mounting the shroud 9 around the two-cycle engine 1.
  • the projections 17 of the shroud 9 are forced into the respective mounting holes 20 of the vibration isolating member 10, with the result that the vibration isolating member 10 is elastically curved along the inner surface of the shroud 9 and is temporarily mounted on the inner surface of the shroud 9.
  • the projections 17 can be easily forced into the respective mounting holes 20, because the projections 17 are relatively rigid, whereas the vibration isolating member 10 is an elastic member. Accordingly, as compared with the prior art structure that the projections formed as a part of an elastic member are forced into the engaging holes of the shroud, the engagement of the projections 17 into the mounting holes 20 can be easily carried out.
  • the shroud 9 with the vibration isolating member 10 is so placed as to surround the cylinder 7 and the cylinder head 8, so that the inner surface of the vibration isolating member 10 abuts against the upper end surfaces of the fins 22 of the cylinder head 8.
  • the shroud 9 is fixed to the cylinder head 8 by using the bolts 14, thereby securely holding the vibration isolating member 10 between the shroud 9 and the fins 22.
  • the vibration isolating member 10 Since the vibration isolating member 10 is temporarily mounted on the shroud 9, the parts can be well handled. Further, since the vibration isolating member 10 can be precisely positioned, the workability in mounting the vibration isolating member 10 can be greatly improved. Moreover, after mounting the shroud 9 around the two-cycle engine 1, the vibration isolating member 10 can be stably fixed with no slip of position by the engagement of the projections 17 with the mounting holes 20 and by the holding pressure between the shroud 9 and the fins 22.
  • vibration isolating member 10 is formed in a platelike shape, all of the plug hole 18, the bolt insert holes 19, the mounting holes 20, and the escape portions 21 can be simultaneously formed only by punching a belt-shaped stock. Further, many similar vibration isolating members can be continuously manufactured with a high efficiency.
  • any specific mold for forming the vibration isolating member 10 is not necessary, thereby realizing high mass-productivity and cost reduction.
  • the formation of the mounting holes 20 may be carried out after punching the belt-shaped stock.
  • the shroud 9 since the mounting holes 20 are formed in the vibration isolating member 10, the shroud 9 must only have the projections 17 instead. Accordingly, the number of openings to be formed in the shroud 9 can be reduced to thereby allow the forced cooling air to be efficiently introduced to the surrounding area of the cylinder 7 and the cylinder head 8.
  • vibration isolating member 10 To mount a vibration isolating member easily at low costs, mounting holes 20 are formed through a platelike vibration isolating member 10, and projections 17 integrally projecting from a shroud 9 are forced into the mounting holes 20, thereby temporarily mounting the vibration isolating member 10 on the shroud 9. In this condition, the shroud 9 is mounted to the cylinder head 8, thereby holding the vibration isolating member 10 between the inner surface of the shroud 9 and fins 22 of the cylinder head 8. Many similar vibration isolating members 10 can be continuously formed by punching a belt-shaped stock.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Vibration Prevention Devices (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
EP96102922A 1995-02-28 1996-02-27 Mounting structure of vibration isolating member to shroud Expired - Lifetime EP0730087B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP4083495 1995-02-28
JP40834/95 1995-02-28
JP04083495A JP3531692B2 (ja) 1995-02-28 1995-02-28 シュラウドに対する防振部材の取付構造

Publications (2)

Publication Number Publication Date
EP0730087A1 EP0730087A1 (en) 1996-09-04
EP0730087B1 true EP0730087B1 (en) 1999-06-09

Family

ID=12591670

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96102922A Expired - Lifetime EP0730087B1 (en) 1995-02-28 1996-02-27 Mounting structure of vibration isolating member to shroud

Country Status (8)

Country Link
EP (1) EP0730087B1 (it)
JP (1) JP3531692B2 (it)
CN (1) CN1077203C (it)
DE (1) DE69602783T2 (it)
ES (1) ES2134521T3 (it)
FR (1) FR2731046B1 (it)
IT (1) IT1284356B1 (it)
TW (1) TW345129U (it)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5857439A (en) * 1997-05-22 1999-01-12 Kioritz Corporation Controlled noise portable power unit for operating a tool
JP3754579B2 (ja) * 1999-07-12 2006-03-15 本田技研工業株式会社 エンジン作業機
JP4549240B2 (ja) * 2005-06-27 2010-09-22 本田技研工業株式会社 小型車両の内燃機関
CN113858937A (zh) * 2021-11-24 2021-12-31 奇瑞商用车（安徽）有限公司 一种汽车冷却风扇减震安装结构

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1064749B (de) * 1958-07-26 1959-09-03 Heinrich Lanz Ag Vorrichtung zur Geraeuschdaempfung fuer ein- oder mehrzylindrige Brennkraftmaschinen
DE3241205A1 (de) * 1982-11-08 1984-05-10 Westfälische Metall Industrie KG Hueck & Co, 4780 Lippstadt Zylinderkopfhaube eines verbrennungsmotors
JPS59139514U (ja) * 1983-03-07 1984-09-18 本田技研工業株式会社 強制空冷エンジン
JP3021166B2 (ja) * 1992-01-30 2000-03-15 本田技研工業株式会社 エンジンカバー

Also Published As

Publication number Publication date
EP0730087A1 (en) 1996-09-04
JPH08232656A (ja) 1996-09-10
ITTO960059A0 (it) 1996-01-30
ES2134521T3 (es) 1999-10-01
ITTO960059A1 (it) 1997-07-30
DE69602783D1 (de) 1999-07-15
JP3531692B2 (ja) 2004-05-31
FR2731046B1 (fr) 1997-05-09
DE69602783T2 (de) 1999-10-07
TW345129U (en) 1998-11-11
FR2731046A1 (fr) 1996-08-30
CN1139733A (zh) 1997-01-08
CN1077203C (zh) 2002-01-02
IT1284356B1 (it) 1998-05-18

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