EP1092850A2 - Moteur à combustion interne - Google Patents

Moteur à combustion interne Download PDF

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Publication number
EP1092850A2
EP1092850A2 EP00122172A EP00122172A EP1092850A2 EP 1092850 A2 EP1092850 A2 EP 1092850A2 EP 00122172 A EP00122172 A EP 00122172A EP 00122172 A EP00122172 A EP 00122172A EP 1092850 A2 EP1092850 A2 EP 1092850A2
Authority
EP
European Patent Office
Prior art keywords
axis
internal combustion
cylinder
combustion engine
crankshaft
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.)
Granted
Application number
EP00122172A
Other languages
German (de)
English (en)
Other versions
EP1092850A3 (fr
EP1092850B1 (fr
Inventor
Eiichiro Tsujii
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.)
Yamaha Marine Co Ltd
Original Assignee
Sanshin Kogyo KK
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
Priority claimed from JP29227699A external-priority patent/JP2001115812A/ja
Application filed by Sanshin Kogyo KK filed Critical Sanshin Kogyo KK
Publication of EP1092850A2 publication Critical patent/EP1092850A2/fr
Publication of EP1092850A3 publication Critical patent/EP1092850A3/fr
Application granted granted Critical
Publication of EP1092850B1 publication Critical patent/EP1092850B1/fr
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
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/02—Arrangements of lubricant conduits
    • 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
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0002—Cylinder arrangements
    • F02F7/0019—Cylinders and crankshaft not in one plane (deaxation)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • F01M9/10—Lubrication of valve gear or auxiliaries
    • 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
    • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
    • 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
    • F02B61/04—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers
    • F02B61/045—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers for marine engines
    • 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
    • F02B75/007—Other engines having vertical crankshafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium

Definitions

  • This invention relates to an internal combustion engine, in particular to the technical field of the oil passage structure in four-stroke cycle engines installed in outboard motors as indicated in the introductory part of claim 1.
  • crankcase volume is enlarged to cope with the above problem.
  • an objective of the present invention to provide an internal combustion engine with an oil passage structure for the outboard motor capable of preventing oil from finding its way into the combustion chamber while securing the compact size of the outboard motor.
  • FIGs. 1 to 5 show an embodiment of the oil passage structure of this invention for outboard motors.
  • FIG. 1 is a side view partially in cross section of an outboard motor.
  • the same parts in different drawings are provided with the same reference numerals and their explanations are sometimes omitted in the following description.
  • the terms 'the front' and 'the rear' as used herein are respectively meant with respect to the advancing direction and the reverse direction of the boat.
  • an outboard motor 1 is provided with; a clamp bracket 3 removably attached to the rear part of a hull 2, a swivel bracket 6 supported for up and down swinging about a tilt shaft 5 on the clamp bracket 3, and a propulsion unit 7 supported for horizontal swiveling on the swivel bracket 6.
  • the propulsion unit 7 has an upper case 9 rotatably supported with the swivel bracket 6, and a lower case 10 attached to the lower part of the upper case 9.
  • the upper and lower cases 9 and 10 constitute a single casing as a whole.
  • a propeller 11 is attached to the lower case 10.
  • a bottom cowling 12 is attached to the top of the upper case 9.
  • a top cowling 13 is removably attached to the bottom cowling 12.
  • An engine 14 is mounted on the upper case 9.
  • the engine 14 is, for example, of the single cylinder, overhead valve, four-stroke cycle type.
  • An engine body comprises; a head cover 15, a cylinder head 16, a cylinder body 17, and a crankcase 19 serving also as an oil pan.
  • a cylinder 20 and a piston 21 are disposed horizontally, and a crankshaft 22 is disposed vertically.
  • the cylinder head 16 is provided with an intake valve 23, an exhaust valve 24, and an exhaust port 25.
  • a recoil starter 26 is attached to the top of the crankshaft 22.
  • the numeral 18 denotes a drive shaft connected to the crankshaft 22, and the numeral 27 denotes a fuel tank laid to extend from the front to the side of the cylinder body 17.
  • FIG. 2(A) shows a cross section of the swivel bracket 6 in FIG.1 and its vicinity.
  • FIG. 2(B) shows the cross section B-B in FIG. 2(A).
  • An upper tube 8 for supporting the engine 14 is formed in tubular shape with an internal exhaust passage 8a. In the exhaust passage 8a are disposed; the drive shaft 18, a shift rod 62, and a cooling water pipe 61 in the vertical direction.
  • An oil pan connecting portion 8b flaring like a dish is formed in the upper part of the upper tube 8.
  • a small diameter tubular portion 8c is formed in the lower part of the upper tube 8.
  • the swivel bracket 6 is formed in tubular shape and its inside circumference is formed with support flanges 6a extending horizontally in two, upper and lower positions.
  • mounts 28 made of an elastic material such as rubber are disposed between the tubular portion 8c of the upper tube 8 and the support flanges 6a of the swivel bracket 6 in two, upper and lower positions.
  • a full pivot type of outboard motor that enables the boat to go forward and backward is constituted in which the upper tube 8 is supported for 360 degree rotation on the swivel bracket 6 through the mounts 28.
  • a bush 28a is interposed between the upper tube 8 and the mounts 28.
  • FIG. 3 is a cross-sectional view as seen in the direction of arrows X-X in FIG. 1.
  • the crankshaft 22 is provided with a crank pin 29 and counterweights 30.
  • the crank pin 29 is connected through a connecting rod 31 to the piston 21.
  • a camshaft 32 is disposed in the cylinder body 17 parallel to the crankshaft 22 so that the rotation of the crankshaft 22 is transmitted to the camshaft 32 through gears 33 and 34.
  • a carburetor 43 and an ignition plug 44 is shown in the drawing.
  • the axis L2 of the cylinder 20 is displaced by a distance D1 in the direction opposite the direction of the lateral component of the thrust acting on the piston 21 with respect to the line L1 that is parallel to the cylinder 20 and passes the axis of the crankshaft 22.
  • the axis of the piston pin 45 is displaced by a distance D2 in the direction of the lateral component of the thrust with respect to the axis L2 of the cylinder 20. In this way, the moment acting on the piston pin 45 is reduced, operation efficiency and durability are improved, and slapping noise is reduced.
  • This arrangement also makes it possible to displace the cylinder 20 and the cylinder head 16 toward the right to produce a space where engine components such as the camshaft 32, the fuel pump 42, and the carburetor 43 are disposed.
  • engine components such as the camshaft 32, the fuel pump 42, and the carburetor 43 are disposed.
  • the engine is made compact without increasing the weight and without changing the direction of rotation.
  • the crankshaft 22 made of a heavy, iron-based material is not displaced, the amount of displacement of center of gravity is held small, so that the amount of vibration is held to a minimum.
  • a valve drive chamber 35 is formed with the cylinder head 16 and the head cover 15.
  • the exhaust valve 24 (also the intake valve 23) extends through the cylinder head 16 into the valve drive chamber 35 and comes into contact with one end of a rocker arm 39 through a valve spring 36 and a retainer 37.
  • a lifter 40 is slidably disposed in the cylinder body 17. One end of the lifter 40 is in contact with a cam of the camshaft 32. The other end of the lifter 40 is in contact with the other end of the rocker arm 39 through a push rod 41.
  • the plunger of a fuel pump 42 is also in contact with the cam of the camshaft 32.
  • FIG. 4 is an enlarged cross-sectional view of an essential part of FIG. 1.
  • FIG. 5(A) is a front view of a cross section Y-Y of the cylinder body as seen in the direction of arrow Y in FIG. 4.
  • FIG. 5(B) is a front view of a cross section Z-Z of the cylinder head as seen in the direction of arrow Y in FIG. 4.
  • a flywheel 45 is attached to the top part of the crankshaft 22.
  • a recoil starter 26 is attached to the top of the flywheel 45.
  • the recoil starter 26 and the flywheel 45 are covered with a starter cover 46.
  • a breather chamber 47 is recess-formed on the top of the cylinder head 16 and tightly closed with a plate 49.
  • a cooling water passage 51 is also formed and provided with a thermostat 50.
  • the cooling water passage 51 is formed around the cylinder 20 in the cylinder body 17.
  • Two oil passages 52 are formed in the upper and lower side walls of the cylinder body 17 to make fluid communication with the crankcase 19.
  • oil passages 53 are formed in the upper and lower side walls of the cylinder head 16 to make fluid communication between the oil passages 52 and the valve drive chamber 35.
  • the oil passages 52, 53 are formed on the side toward which the cylinder 20 and the cylinder head 16 are displaced, namely on the side opposite the side on which the carburetor 43 is located. This makes it possible to reduce the width of the outboard motor. Forming the oil passages 52, 53 on the side on which a manual handle bar 55 for manually controlling the outboard motor is located makes it possible, when the outboard motor is placed laterally with the manual handle bar 55 downward, to stabilize the outboard motor as oil collects in its lower part.
  • the outboard motor can be made compact.
  • the disposal of a counterweight is preferred wherein the center of gravity of said counterweight associated to the crankshaft is positioned on or close to said parallel line intersecting the axis of the crankshaft, when the piston is in one of its top or bottom dead center positions.
  • the amount of displacement ⁇ of the center of gravity relative to the line L3 interconnecting the axis P2 of the crank pin, the axis P1 of the crankshaft and the axis P3 of the piston pin is set to be 0 ⁇ ⁇ ⁇ ( ⁇ + ⁇ )/2 wherein ⁇ is assumed to be the angle between the line L3 connecting the axes (P2,P1,P3) of the crank pin (29), the crankshaft (22) and the piston pin (45) and the line (L1) extending in parallel to the cylinder axis (L2) and intersecting the axis of the crankshaft (22) with the piston (21) being at its top dead center position while ⁇ is assumed to define the same geometrical relationship between the afore-indicated lines (L3,L1) when the piston is in its bottom dead center position.
  • the position of the center of gravity (G) when the piston 21 assumes its top or bottom dead center positions is adjusted by adapting the counterweight 30 in shape, providing a recess therein or adding a weight thereto.
  • the axis of a piston pin is displaced by a distance D2 in the direction of a lateral component of the thrust F with respect to the axis L2 of the cylinder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
EP00122172A 1999-10-12 2000-10-12 Moteur hors-bord Expired - Lifetime EP1092850B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP28903099 1999-10-12
JP28903099 1999-10-12
JP29227699 1999-10-14
JP29227699A JP2001115812A (ja) 1999-10-14 1999-10-14 船外機のオイル通路構造

Publications (3)

Publication Number Publication Date
EP1092850A2 true EP1092850A2 (fr) 2001-04-18
EP1092850A3 EP1092850A3 (fr) 2002-04-17
EP1092850B1 EP1092850B1 (fr) 2006-04-19

Family

ID=26557428

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00122172A Expired - Lifetime EP1092850B1 (fr) 1999-10-12 2000-10-12 Moteur hors-bord

Country Status (1)

Country Link
EP (1) EP1092850B1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5049100A (en) * 1989-04-17 1991-09-17 Honda Giken Kogyo Kabushiki Kaisha Outboard engine unit
US5243937A (en) * 1990-12-29 1993-09-14 Ryobi Limited Portable engine unit
US5509836A (en) * 1994-03-07 1996-04-23 Sanshin Kogyo Kabushiki Kaisha Outboard motor
EP0779412A2 (fr) * 1995-12-15 1997-06-18 Honda Giken Kogyo Kabushiki Kaisha Système de lubrification d'un moteur à quatre temps
JPH1073012A (ja) * 1997-07-07 1998-03-17 Sanshin Ind Co Ltd ４サイクル船外機の潤滑装置
JPH10238359A (ja) * 1997-02-28 1998-09-08 Kawasaki Heavy Ind Ltd 小型滑走艇
JPH1162538A (ja) * 1997-08-14 1999-03-05 Sanshin Ind Co Ltd 船外機用ｄｏｈｃ型エンジンの潤滑装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5049100A (en) * 1989-04-17 1991-09-17 Honda Giken Kogyo Kabushiki Kaisha Outboard engine unit
US5243937A (en) * 1990-12-29 1993-09-14 Ryobi Limited Portable engine unit
US5509836A (en) * 1994-03-07 1996-04-23 Sanshin Kogyo Kabushiki Kaisha Outboard motor
EP0779412A2 (fr) * 1995-12-15 1997-06-18 Honda Giken Kogyo Kabushiki Kaisha Système de lubrification d'un moteur à quatre temps
JPH10238359A (ja) * 1997-02-28 1998-09-08 Kawasaki Heavy Ind Ltd 小型滑走艇
JPH1073012A (ja) * 1997-07-07 1998-03-17 Sanshin Ind Co Ltd ４サイクル船外機の潤滑装置
JPH1162538A (ja) * 1997-08-14 1999-03-05 Sanshin Ind Co Ltd 船外機用ｄｏｈｃ型エンジンの潤滑装置

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 08, 30 June 1998 (1998-06-30) & JP 10 073012 A (SANSHIN IND CO LTD), 17 March 1998 (1998-03-17) *
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 14, 31 December 1998 (1998-12-31) & JP 10 238359 A (KAWASAKI HEAVY IND LTD), 8 September 1998 (1998-09-08) *
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 08, 30 June 1999 (1999-06-30) & JP 11 062538 A (SANSHIN IND CO LTD), 5 March 1999 (1999-03-05) *

Also Published As

Publication number Publication date
EP1092850A3 (fr) 2002-04-17
EP1092850B1 (fr) 2006-04-19

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