EP0661418B1 - Internal combustion engine - Google Patents

Internal combustion engine Download PDF

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Publication number
EP0661418B1
EP0661418B1 EP19940120849 EP94120849A EP0661418B1 EP 0661418 B1 EP0661418 B1 EP 0661418B1 EP 19940120849 EP19940120849 EP 19940120849 EP 94120849 A EP94120849 A EP 94120849A EP 0661418 B1 EP0661418 B1 EP 0661418B1
Authority
EP
European Patent Office
Prior art keywords
intake
cylinder head
camshaft
exhaust
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
EP19940120849
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0661418A1 (en
Inventor
Masaaki C/O Yamaha Hatsudoki K.K. Yoshikawa
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 EP0661418A1 publication Critical patent/EP0661418A1/en
Application granted granted Critical
Publication of EP0661418B1 publication Critical patent/EP0661418B1/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
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/024—Belt drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/022—Chain drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • F01L1/0532—Camshafts overhead type the cams being directly in contact with the driven valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F01L1/265—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder peculiar to machines or engines with three or more intake valves per cylinder
    • 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 
    • F02F1/02—Cylinders; Cylinder heads  having cooling means
    • F02F1/10—Cylinders; Cylinder heads  having cooling means for liquid cooling
    • F02F1/108—Siamese-type cylinders, i.e. cylinders cast together
    • 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
    • F02F1/242—Arrangement of spark plugs or injectors
    • 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
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • F02F1/4221—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder particularly for three or more inlet valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • F01L2001/0537—Double overhead camshafts [DOHC]
    • 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
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
    • 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
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/02—Attachment or mounting of cylinder heads on cylinders
    • 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
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/08—Endless member is a chain
    • 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
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/18—DOHC [Double overhead camshaft]
    • 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
    • F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
    • F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
    • F02B67/06—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus driven by means of chains, belts, or like endless members
    • 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
    • F02B77/005—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
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis
    • 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
    • F02F7/006—Camshaft or pushrod housings
    • F02F2007/0063—Head bolts; Arrangements of cylinder head bolts
    • 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
    • F02F7/006—Camshaft or pushrod housings

Definitions

  • This invention concerns an internal combustion engine of the four cycle type comprising a cylinder block with at least one cylinder bore defined therein, a piston reciprocating in said cylinder bore, a crank shaft rotatably journaled and driven by said piston, a cylinder head affixed to said cylinder block through a plurality of head bolts, an exhaust passage arrangement and an intake passage arrangement with a plurality of exhaust valves and at least three intake valves supported in said cylinder head, said exhaust valves and said intake valves being actuated by an exhaust camshaft and an intake camshaft, respectively, each being provided with a plurality of cams for actuating the intake valves and exhaust valves, respectively, through respective valve lifters slidably received within respective lifter holes formed in the cylinder head and at least one of said head bolts being disposed on the intake side of the cylinder head laterally outwards with respect to the intake camshaft.
  • the present invention was developed after reflection upon the foregoing problems and its objective is the creation of a four-cycle engine which, even with a large number of valves, allows a compact cylinder head with a single structure.
  • this objection is solved for an internal combustion engine as indicated above in that camshafts are driven from said crankshaft via an intermediate reduction gear unit and that all lifter holes on the intake side of the cylinder head are disposed inwardly with respect to the head bolts on the intake side of the cylinder head towards the cylinder bore axis, while the head bolts on the exhaust side are disposed between lifter holes on the exhaust side of the cylinder head with respect to the axis of said exhaust camshaft.
  • the foregoing air intake valves are configured in a radiating manner, and moreover, positioned so that the distance between the axes of adjacent air intake valves is a minimum substantially at the mid-way position in the valve axial direction from the lower edge of the valve to the top of edge of the lifter.
  • the camshaft bearings are located between the air intake valve lifters on at least the air intake side of each cylinder, and since the cylinder head bolts on at least the air intake side are positioned outside the air intake valve lifters, interference among the cylinder head bolts, the lifters and camshaft bearings is avoided, thereby allowing a single cylinder head structure, fewer cylinder head parts, and a simplified cylinder head structure.
  • said four-cycle engine 1 is a multicylinder engine with the cylinders positioned side-by-side.
  • the assembly comprises a pulley 3 affixed to one end of the crankshaft 2, a drive pulley 5 for the alternator 4, a drive pulley 7 for the water pump 6, a drive pulley 9 for the power steering pump 8, and a drive pulley 11 for the air conditioning compressor 10.
  • These pulleys 3, 5, 7, 9, and 11 are connected by a V-belt 12.
  • a pulley 13 is used to adjust the tension of V-belt 12.
  • a cylinder head 15 is affixed atop the cylinder block 14 of the four-cycle engine 1.
  • a cylinder head cover 16 also covers the top of said cylinder head 15.
  • An oil pan 17 is mounted under the cylinder block 14.
  • crankshaft 2 protrudes through a space formed at one end of the cylinder block 14, as shown in Figure 7, and a small diameter sprocket 18 is affixed there to said crankshaft 2.
  • a freely rotating intermediate shaft 19 is present at the bottom of the foregoing cylinder head 15 and is parallel to the crankshaft 2.
  • Large and small diameter sprockets 20, 21 are affixed to one end of said intermediate shaft 19.
  • camshafts 22 and 23 are present on the top of the cylinder head 15 on the air intake and exhaust sides and run perpendicularly to the plane of the paper of Figure 7.
  • Sprockets 24 and 25 are affixed to one end of each of these camshafts 22, 23, respectively and are larger in diameter than the foregoing sprocket 21.
  • a chain 26 spans the foregoing sprockets 18 and 20, while a chain 27 spans sprockets 21, 24 and 25. These chains 26 and 27 are maintained at the required tension by tensioners 28 and 29.
  • the four-cycle engine 1 as shown is of the 5-valve type, with three exhaust valves, 30-1, 30-2 (see Figures 3 and 4) on the air intake side and two exhaust valves 31 (see Figure 3) on the exhaust side.
  • Three air intake passages 32-1, 32-2 (see Figures 3 and 4) and two exhaust passages 33 (see Figure 3) are present in the cylinder head 15. These air intake passages 32-1, 32-2 are opened and closed by the foregoing air intake valves 30-1, 30-2 at the appropriate timing, as are the exhaust passages 33 by the foregoing exhaust valves 31.
  • valves 30-1, 30-2 and the exhaust valves 31 are inserted and retained in valve guides 34, 35 so that they are free to slide. Above them are valve lifters 36, 37 respectively. These air intake valves 30-1, 30-2, and exhaust valves 31 are held in the normally closed position by springs 38, 39, respectively.
  • valve lifters 36 are slidably fitted into three round holes 40-1, 40-2 present at the air intake side of each cylinder in the cylinder head 15.
  • Valve lifters 37 are slidably fitted into two round holes 41 on the exhaust side of each cylinder in the cylinder head 15.
  • the thickness of the material between adjacent round holes 40-1, 40-2, which are positioned in a radiating manner and which contain the foregoing air intake valves 30-1, 30-2, is at its minimum in the mid-way position in the axial direction of the valves. Accordingly, the distance between the adjacent air intake valves 30-1, 30-2 has been shortened, providing space for the cam shaft 22 journal and allowing to increase the diameter of the lifters 36.
  • the foregoing camshafts 22, 23 run parallel to each other on the air intake and exhaust sides on top of the cylinder head 15.
  • the air intake side camshaft 22 is supported so that it is free to rotate in the journal areas on bearings held by the bearing cap 42 between the valve lifters 36 (between the round holes 40-1 and 40-2) in the cylinder head 15, and on bearings at both ends of the cylinder head 15 held by bearing caps 43.
  • the exhaust side camshaft 23 is supported in such manner by bearings 44 that it is free to rotate in the areas between valve lifters 37 (holes 41) in the cylinder head 15, said bearing 44 being held in place by bearing cap 46 and bolts 45 (see Figure 4), as well as by bearings at both ends of the cylinder head 15, which are held by bearing caps 47.
  • camshafts 22, 23 and the cams 22a, 23a sliding against the above mentioned valve lifters 36, 37, are each formed integrally as single units.
  • the offset e 1 and e 3 on both sides is taken on the inside of the centers of the cams 22a, while the offset e 2 of the center is taken on the left side of the center of cam 22a. Accordingly, The distance from the center l 1 of the left side two cams 22a, is greater than the distance l 2 on the right side two cams 22a (l 1 > l 2 ), so that the thickness b 1 of the journal area between the left side two cams 22a is greater than the thickness b 2 of the journal area between the right side two cams (b 1 > b 2 ).
  • the offset e 2 may be used on either side of the center of cam 22a, and if the offset e 2 had been taken on the right side with respect to the center of the cam 22a in Figure 5, then the above described relationships would be reversed: they would be l 1 ⁇ l 2 , b 1 ⁇ b 2 , respectively.
  • the plug holes 48, one for each cylinder, in the central area of the cylinder head 15 are such that they tilt toward the exhaust side.
  • the holes 49 in the cylinder head 15 are sand drain holes used for the casting process.
  • the cylinder head 15 has been cast as a single unit, and it is held onto the foregoing cylinder block 14 (see Figure 6) by means of cylinder head bolts 52, 53 (see Figure 2) which pass though the bolt insertion holes 50 present at an appropriate pitch on the air intake side, and bolt insertion holes 51 present at an appropriate pitch on the exhaust side of the cylinder head 15.
  • the bolt insertion holes 50 on the air intake side are outside the valve lifters 26 (round holes 40-1, 40-2).
  • camshafts 22 and 23 the ratios of the diameters of the sprocket 21 on the intermediate shaft 19 to the sprockets 24 and 25 on the camshafts 22 and 23 implementing the second-stage speed reduction, as a result of which said camshafts 22 and 23 rotate at half the speed of the crankshaft 2.
  • cams 22a, 23a are caused to rotate, thereby pushing the foregoing intake and exhaust valve lifters 36, 37 downward at an appropriate timing, overcoming the force of springs 38, 39 for the intake and exhaust valves 30-1, 30-2, and 31, whereby, as described above, the intake and exhaust passages 32-1, 32-2, and 33 are opened and closed at the appropriate timing by the intake and exhaust valves 30-1, 30-2 and 31.
  • the rotational speed of the crankshaft is reduced in two stages when transmitted to the camshafts 22, 23, thereby enabling the sprockets 24, 25 affixed to camshafts 22, 23 to be of a lesser diameter, allowing a reduction of the distance between the camshafts 22 and 23, which further reduces the size of this four-cycle engine 1.
  • This embodiment comprises bearings for the camshaft 22 which are positioned between the valve lifters 36 for the three air intake valves 30-1, 30-2 on the air intake side, the bolt insertion holes 50 (for cylinder head bolts 52) on the air intake side being positioned outside the air intake side valve lifters 36 (round holes 40-1, 40-2), while avoiding interference among the cylinder head bolts 52, the valve lifters 36 and the bearings.
  • the cylinder head may be a single structure; one which is simpler and which offers a reduced number of parts for the cylinder head 15.
  • the shown embodiment simplifies the cylinder head structure, even enabling a single cylinder head structure for multi-valve engines and the achievement of more compact four-cycle engines of the type having three air intake valves per cylinder and overhead air intake and exhaust camshafts, by using a cylinder head with a single structure, a two stage speed reduction in the transmission of the rotation of the crankshaft to the foregoing camshafts, and further, by positioning camshaft bearings between the air intake valve lifters, and by positioning the cylinder head bolts outside the air intake valve lifters on the air intake side of the head.
  • the provision and arrangement of the sand drain holes 49 is advantageous particularly with respect to the casting process. This is, of course, not restricted to sand drain holes provided in combination with the intermediate reduction gear unit or the head bolts disposed laterally outwards with respect to the intake camshaft.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
EP19940120849 1993-12-28 1994-12-28 Internal combustion engine Expired - Lifetime EP0661418B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP336881/93 1993-12-28
JP33688193A JP3360224B2 (ja) 1993-12-28 1993-12-28 ４サイクルエンジン

Publications (2)

Publication Number Publication Date
EP0661418A1 EP0661418A1 (en) 1995-07-05
EP0661418B1 true EP0661418B1 (en) 1999-03-10

Family

ID=18303524

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940120849 Expired - Lifetime EP0661418B1 (en) 1993-12-28 1994-12-28 Internal combustion engine

Country Status (3)

Country Link
EP (1) EP0661418B1 (ja)
JP (1) JP3360224B2 (ja)
DE (1) DE69416986T2 (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2959948B1 (fr) * 2010-05-12 2013-04-12 Peugeot Citroen Automobiles Sa Procede de dimensionnement d'un bossage, de fabrication d'une piece de fonderie, culasse de moteur thermique
JP7491654B2 (ja) * 2020-03-23 2024-05-28 ダイハツ工業株式会社 燃焼試験用４サイクルエンジン

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61268849A (ja) * 1985-05-24 1986-11-28 Toyota Motor Corp 内燃機関のシリンダヘツドの冷却水通路構造
DE3838305A1 (de) * 1988-11-11 1990-05-17 Audi Ag Zylinderkopf einer brennkraftmaschine
JPH02173303A (ja) * 1988-12-26 1990-07-04 Nissan Motor Co Ltd Ｄｏｈｃ機関のカム軸駆動装置
JP2748272B2 (ja) * 1989-03-03 1998-05-06 ヤマハ発動機株式会社 頭上カム軸式エンジン
JP2766292B2 (ja) * 1989-03-10 1998-06-18 ヤマハ発動機株式会社 エンジンの動弁装置
US5018497A (en) * 1989-05-29 1991-05-28 Yamaha Hatsudoki Kabushika Kaisha Multiple valve internal combustion engine
JP2950953B2 (ja) * 1990-09-04 1999-09-20 ヤマハ発動機株式会社 ４サイクルエンジンの動弁装置
JP2951066B2 (ja) * 1991-09-13 1999-09-20 ヤマハ発動機株式会社 内燃エンジン

Also Published As

Publication number Publication date
DE69416986T2 (de) 1999-07-08
JPH07189617A (ja) 1995-07-28
JP3360224B2 (ja) 2002-12-24
DE69416986D1 (de) 1999-04-15
EP0661418A1 (en) 1995-07-05

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