EP1130236A2 - Brennkraftmaschine - Google Patents

Brennkraftmaschine Download PDF

Info

Publication number
EP1130236A2
EP1130236A2 EP01104606A EP01104606A EP1130236A2 EP 1130236 A2 EP1130236 A2 EP 1130236A2 EP 01104606 A EP01104606 A EP 01104606A EP 01104606 A EP01104606 A EP 01104606A EP 1130236 A2 EP1130236 A2 EP 1130236A2
Authority
EP
European Patent Office
Prior art keywords
crankshaft
oil pump
engine
journal bearing
step portion
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
EP01104606A
Other languages
English (en)
French (fr)
Other versions
EP1130236B1 (de
EP1130236A3 (de
Inventor
Kazuhiro Yamaha Hatsudoki Kabushiki Kaisha Nara
Kimio Yamaha Hatsudoki Kabushiki K. Futohashi
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 Motor Co Ltd
Original Assignee
Yamaha 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 Yamaha Motor Co Ltd filed Critical Yamaha Motor Co Ltd
Publication of EP1130236A2 publication Critical patent/EP1130236A2/de
Publication of EP1130236A3 publication Critical patent/EP1130236A3/de
Application granted granted Critical
Publication of EP1130236B1 publication Critical patent/EP1130236B1/de
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
    • 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
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • 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
    • 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

Definitions

  • This invention relates to an engine with a crankshaft having a crankshaft axis supported by at least one crank journal bearing.
  • FIGs. 5 and 6 A conventional example of an oil pump positioning structure in a unit swing type of engine for motorcycles of a small-sized scooter shape is shown in FIGs. 5 and 6.
  • FIGS. 5 and 6 show cross sections in the crankshaft end portion of four-stroke cycle engines.
  • an oil pump 132 attached to a crankcase 103 is positioned with a displacement in the direction of a crankshaft 107 from a crank journal bearing 127, a gear 136 attached to an end of the shaft 135 of the pump is made to directly engage with a gear 139 attached to the crankshaft 127, and the pump shaft 135 is driven for rotation by the rotation of the crankshaft 107 transmitted through the gears 139 and 136 to the pump shaft 135.
  • an oil pump 232 attached to a crankcase 203 is positioned nearly the same as the crank journal bearing 227 in the crankshaft direction, an endless chain 240 is routed around between a sprocket 236 attached to an end of the pump shaft 235 and a sprocket 239 attached to the crankshaft 207, and the pump shaft 235 is driven for rotation by the rotation of the crankshaft 207 transmitted through the sprocket 239, the chain 240, and the sprocket 236 to the pump shaft 235.
  • the positioning structure shown in FIG. 5 has problems: In order to secure a required delivery rate of the oil pump 132, a certain gear ratio is required between the gears 136 and 139, which automatically determines the distance between the oil pump 132 and the crankshaft 107, which in turn means that the oil pump 132 cannot be positioned largely apart from the crankshaft 107 in the radial direction but must be positioned, to avoid interference with the crank journal bearing 127, with a displacement in the crankshaft direction from the crank journal bearing 127 as described above. As a result, the width of the engine increases, and the engine cannot be made small and compact.
  • said objective is solved by an engine with a crankshaft having a crankshaft axis supported by at least one crank journal bearing, and with an oil pump positioned in a vicinity of the crank journal bearing so as to at least partially overlap with said crank journal bearing in a direction of the crankshaft axis.
  • said objective is also solved by an engine with a crankshaft having a crankshaft axis supported by at least one crank journal bearing, wherein said crank journal bearing is supported on one side of a step portion of a crank case, and with an oil pump positioned in a vicinity of the crank journal bearing at a side opposing said one side of said step portion, said oil pump has a main part section spaced from said step portion.
  • Said engine is provided with an oil pump in the vicinity of the crank journal bearing supported by the step portion in order to provide a compact structure and with said space between the step portion and the main part section of the oil pump, any deflection of the step portion which may be caused by forces applied to the bearing are not transmitted to the main part section.
  • an oil pump in the vicinity of the crank journal bearing supported by the step portion in order to provide a compact structure and with said space between the step portion and the main part section of the oil pump, any deflection of the step portion which may be caused by forces applied to the bearing are not transmitted to the main part section.
  • the unit swing type of engine 10 shown in FIG. 1 is to be mounted on scooter type of motorcycles.
  • the engine 10 is constituted as a single unit with; a forced air-cooled four-stroke cycle engine (hereinafter called simply an engine) 1, a transmitting mechanism including a V-belt type of transmission 2, etc., compactly assembled in a crankcase 3.
  • the engine 1 has a single cylinder 5 bored in a cylinder body 4 directed generally horizontally forward of the vehicle body of a scooter type of motorcycle.
  • a piston 6 is slidably disposed in the cylinder 5.
  • the piston 6 is connected through a connecting rod 8 to a crankshaft 7 disposed rotatably in the vehicle width direction.
  • a cylinder head 9 placed to cover the cylinder body 4 has an intake port 10 and an exhaust port 11 bored therein.
  • the intake and exhaust ports 10 and 11 are opened and closed according to appropriate timing with intake and exhaust valves 12 and 13, so that gas is exchanged as required in the cylinder 5.
  • the intake and exhaust valves 12 and 13 are inserted into and held slidably with valve guides 14 and 15 press-fitted into the cylinder head 9, and urged toward the closing side with springs 16 and 17, and their tops are in contact with one side ends of rocker arms 18 and 19.
  • the rocker arms 18 and 19 are pivoted for swinging about their middle parts, about shafts 20 and 21.
  • the other side ends of the rocker arms 18 and 19 are in contact with cams formed integrally with a camshaft 22.
  • a chain sprocket 23 is attached to one end of the camshaft 22.
  • An endless cam chain 25 is routed around between the chain sprocket 23 and another sprocket 24 attached to the middle part of the crankshaft 7.
  • crankshaft 7 The rotation of the crankshaft 7 is transmitted through the sprocket 24, the cam chain 25, and the chain sprocket 25 to the camshaft 22.
  • the intake and exhaust valves 12 and 13 are driven with the rocker arms 18 and 19 to open and close the intake and exhaust ports 10 and 11 according to appropriate timing. In this way, gas is exchanged in the cylinder 5 as required.
  • an ignition plug 26 is screwed into the cylinder head 9 and the electrode portion of the ignition plug 26 is located in a corner of a combustion chamber S formed with the cylinder head 9.
  • crankshaft 7 is rotatably supported with paired right and left crank journal bearings 27.
  • a cooling fan 28 is attached to one (right) end of the crankshaft 7.
  • a dynamo 29 is disposed inside the cooling fan 28.
  • To the other (left) end of the crankshaft 7 is attached a drive pulley 30 as a component of the V-belt type of transmission 2.
  • an intake pipe 31 continuing to the intake port 10 is attached to the upper part of the cylinder head 9.
  • a carburetor and an air cleaner both not shown
  • An exhaust pipe (not shown) is attached to the exhaust port 11 which is open to the lower part of the cylinder head 9.
  • An exhaust muffler (not shown) is connected to the exhaust pipe.
  • oil is circulated with an oil pump 32 shown in FIG. 4 to lubricate and cool various parts of the engine.
  • a positioning structure of the oil pump 32 will be described in reference to FIG. 4.
  • the oil pump 32 is of a gear-driven trochoid type driven with the crankshaft 7 and constituted with a cogwheel 34 housed in a pump main part 33, and a large diameter gear 36 attached to an end of a pump shaft 35 projecting out of the pump main part 33.
  • the pump main part 33 comprises main part section 33a housing said cogwheel 34 and made by die casting.
  • Said pump main part 33 further comprises a sheet metal plate 33b placed on the main part section 33a and secured to it with screws 37.
  • the oil pump 32 or its main part 33, constituted as described above is secured with bolts (not shown) to the crankcase 3 in the same position in the crankshaft direction as the crank journal bearings 27.
  • the pump main part 33 When the oil pump 32 is to be attached to the crankcase 3, the pump main part 33 is positioned close to the crank journal bearing 27 with part of the periphery of the pump main part 33 used as an assembly reference.
  • Said crank case 3 supports said crank journal bearing 27 and said oil pump 32.
  • a step portion 3a is extends from the crank case 3.
  • Said crank journal bearing 27 is supported on one side of said step portion 3a and said oil pump (32) is provided at the opposing side of said step portion 3a.
  • the step portion 3a extends in the direction of the crankshaft axis.
  • a space is provided between the side of the step portion 3a which is facing the oil pump 32 and the main part section 33a of said oil pump 32.
  • the plate shaped member 33b which is provided between said main part section 33a and said crank case 3 extends along said crank case 3 with regard to a radial direction of the crank shaft 7.
  • Said plate shaped member 33b serves as an assembly reference for the oil pump 32 in the radial direction of the crank shaft 7. That is to say, part of the periphery of the sheet metal plate 33b of the pump main part 33 is brought into butting contact with the step portion 3a of the supporting portion of the crankcase 3 supporting the crank journal bearing 27.
  • the entire engine 1 constituted as described above is enclosed with an air shroud 40 made of a plastic material, as shown in Figs. 1 and 2.
  • Part of the air shroud 40 opposite the cooling fan 28 is provided with a round, cooling air introducing opening 40a coaxially with the crankshaft 7.
  • the air shroud 40 is provided, at its front part, with a plug hole 40b which is open to the obliquely side direction and, behind it, with a round hole 40c for checking the top dead center.
  • an ignition plug 26 is passed through the plug hole 40b and covered with a plug cap 41 fitted from outside.
  • a rubber cap 42 is removably fitted to the round, top dead center checking hole 40c.
  • the air shroud 40 is attached to the crankcase 3 using plural screws 43.
  • a driven shaft 44 As shown in FIG. 1, in the rear part of the crankcase 3 are rotatably disposed a driven shaft 44, an intermediate shaft (not shown), and an output (wheel) shaft 45, parallel to each other.
  • a driven pulley 46 and a centrifugal clutch 47 are attached to the driven shaft 44.
  • An endless V-belt 48 is fitted around between the driven pulley 46 and the drive pulley 30 to constitute the V-belt type of automatic transmission 2.
  • a small diameter gear 49 is formed integrally with one (right) end of the driven shaft 44.
  • a driven gear and a drive gear of a large and a small diameters respectively are attached to an intermediate shaft (not shown).
  • the driven gear of the intermediate shaft meshes with the drive gear 49.
  • the drive gear (not shown) of the intermediate shaft meshes with the large diameter driven gear 50 attached to the output shaft 45.
  • a rear wheel 51 of the scooter type of motorcycle is attached to the end of the output shaft 45 protruding out of a side of the transmission case 3.
  • a kick lever 52 for kick-starting is shown in FIG. 1.
  • the centrifugal clutch 47 becomes operative when its rotation speed exceeds a specified value and transmits rotation to the driven shaft 44.
  • the rotation of the driven shaft 44 with its speed reduced through the drive gear 49 and a driven gear (not shown) provided on the intermediate shaft, is transmitted to the intermediate shaft.
  • the rotation of the intermediate shaft with its speed further reduced through a drive gear (not shown) and the driven gear 50, is transmitted to the output shaft 45.
  • the output shaft 45 and a rear wheel 51 attached to the output shaft 45 are driven to rotate and propel the scooter type of motorcycle.
  • cooling air is introduced through the cooling air introducing inlet 40a bored in the side wall of the air shroud 40 into the interior of the air shroud 40 as the cooling fan 28 is rotated as described above, and the cooling air flows through the interior of the air shroud 40 and cools various parts of the engine 1 including the cylinder body 4 and the cylinder head 9.
  • oil pump 32 In the engine 1, as the oil pump 32 is driven with the crankshaft 7, oil is circulated with the oil pump 32 to lubricate and cool various parts. That is, the rotation speed of the crankshaft 7 is reduced through the gears 36 and 39 with a specified ratio and transmitted to the pump shaft 35 of the oil pump 32. As the pump shaft 35 is driven to rotate, oil is drawn into the oil pump 32, oil pressure is raised with the oil pump 32 to a specified value, and the oil of raised pressure is delivered out of the oil pump 32 to lubricate and cool various parts.
  • part of the periphery of the pump main part 33 (or part of the sheet metal plate 33b) of the oil pump 32 is used as an assembly reference for positioning the pump main part 33 close to the crank journal bearing 27.
  • radial dimension of the engine 1 is reduced to make the engine 1 further small and compact.
  • the oil pump is positioned the same as the crank journal bearing in the crankshaft direction and a constitution is employed in which the gear attached to the pump shaft is made to mesh with the gear attached to the crankshaft to transmit the rotation of the crankshaft through those gears to the pump shaft.
  • the engine described above comprises an oil pump positioning structure, wherein an oil pump is positioned the same as a crank journal bearing in the crankshaft direction, a gear attached to the shaft of the oil pump and a gear attached to the crankshaft are made to engage with each other, and the rotation of the crankshaft is transmitted to the pump shaft through the gears.
  • said oil pump positioning structure for four-stroke cycle engines that makes it possible to reduce costs by the use of inexpensive gear-driven type of oil pump and by the use of the same pump main part on several different engines, and to make the engine small and compact by reducing the engine width.
  • the oil pump is positioned the same as the crank journal bearing in the crankshaft direction, the engine width can be reduced to make the engine small and compact. And the use of the inexpensive gear-driven type of oil pump makes it possible to use the same pump main part on plural number of engines of different engine displacements in common to reduce costs.
  • the main part of the pump is positioned in the vicinity of the crank journal bearing with part of the periphery of the pump main part used as an assembly reference. Since the pump main part is positioned close to the crank journal bearing with part of the pump main part periphery used as an assembly reference, the radial dimension of the engine is reduced and the engine can be made further small and compact.
  • the above mentioned embodiment teaches an engine with a crankshaft 7 having a crankshaft axis supported by at least one crank journal bearing 27, and with an oil pump 32 positioned in a vicinity of the crank journal bearing 27 so as to at least partially overlap with said crank journal bearing 27 in a direction of the crankshaft axis.
  • the crank case 3 of said engine is provided to support said crank journal bearing 27 and said oil pump 32.
  • Said crank case 3 comprises a step portion 3a extending in the direction of the crankshaft axis, wherein said crank journal bearing 27 is supported on one side of said step portion 3a and said oil pump 32 is provided at a further side opposing said one side of said step portion 3a with regard to a radial direction of the crankshaft 7.
  • Said oil pump 32 has a main part section 33a spaced from said step portion 3a in the radial direction of the crankshaft 7.
  • the above mentioned embodiment also teaches an engine with a crankshaft 7 having a crankshaft axis supported by at least one crank journal bearing 27, wherein said crank journal bearing 27 is supported on one side of a step portion 3a of a crank case 3, and with an oil pump 32 positioned in a vicinity of the crank journal bearing 27 at a side opposing said one side of said step portion 3a, said oil pump 32 has a main part section 33a spaced from said step portion 3a.
  • said main part section 33a houses a cogwheel 34 of the oil pump 32.
  • Said oil pump 32 has a plate shaped member 33b provided between said main part 33a section and said crank case 3 and said plate shaped member 33b is attached to said main part section 33a.
  • a part of a periphery of the oil pump 32 serves as an assembly reference.
  • a part of a peripheral section of the plate shaped member 33b abuts the step portion 3a of the crank case 3 to serves as an assembly reference.
  • Said crank case 3 has a case portion extending from said step portion 3a in a radial direction with regard to crankshaft 7, wherein said oil pump 32 is attached to said case portion.
  • Said oil pump 32 is driven by said crankshaft 7 and said oil pump 32 comprises a pump shaft 35 and a first gear 36 is attached to said pump shaft 35 and a second gear 39 is attached to the crankshaft 7, wherein said first and second gear 36,39 are engaged with each other to transmit a drive force of the crankshaft 7 to the pump shaft 35.
EP01104606A 2000-02-29 2001-02-23 Brennkraftmaschine Expired - Lifetime EP1130236B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000054618 2000-02-29
JP2000054618A JP2001241310A (ja) 2000-02-29 2000-02-29 ４サイクルエンジンのオイルポンプ配置構造

Publications (3)

Publication Number Publication Date
EP1130236A2 true EP1130236A2 (de) 2001-09-05
EP1130236A3 EP1130236A3 (de) 2002-08-14
EP1130236B1 EP1130236B1 (de) 2007-08-29

Family

ID=18575848

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01104606A Expired - Lifetime EP1130236B1 (de) 2000-02-29 2001-02-23 Brennkraftmaschine

Country Status (7)

Country Link
EP (1) EP1130236B1 (de)
JP (1) JP2001241310A (de)
CN (1) CN1230605C (de)
ES (1) ES2292502T3 (de)
ID (1) ID29369A (de)
MY (1) MY128203A (de)
TW (1) TW515768B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1958813A1 (de) * 2007-02-19 2008-08-20 Yamaha Hatsudoki Kabushiki Kaisha Fahrzeug
US9976543B2 (en) 2014-05-05 2018-05-22 Ford Global Technologies, Llc Transmission for motor vehicle and method of pumping transmission fluid through the transmission

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008196355A (ja) 2007-02-09 2008-08-28 Yamaha Motor Co Ltd 鞍乗型車両

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1903080A (en) * 1928-12-19 1933-03-28 Packard Motor Car Co Internal combustion engine
GB807325A (en) * 1956-06-05 1959-01-14 Fiat Spa Device for transferring oil from a stationary pipe to passages machined inside a rotating crankshaft
FR1536657A (fr) * 1967-09-11 1968-08-16 Caterpillar Tractor Co Pompe à huile de faible encombrement pour moteur à combustion interne
DE19632024C2 (de) * 1996-08-08 1998-07-02 Daimler Benz Ag Ölpumpe für eine Brennkraftmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1958813A1 (de) * 2007-02-19 2008-08-20 Yamaha Hatsudoki Kabushiki Kaisha Fahrzeug
US9976543B2 (en) 2014-05-05 2018-05-22 Ford Global Technologies, Llc Transmission for motor vehicle and method of pumping transmission fluid through the transmission

Also Published As

Publication number Publication date
MY128203A (en) 2007-01-31
ID29369A (id) 2001-08-30
CN1311387A (zh) 2001-09-05
EP1130236B1 (de) 2007-08-29
CN1230605C (zh) 2005-12-07
JP2001241310A (ja) 2001-09-07
TW515768B (en) 2003-01-01
ES2292502T3 (es) 2008-03-16
EP1130236A3 (de) 2002-08-14

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