EP0416600A1 - Zylinderkopf eine Brennkraftmaschine - Google Patents

Zylinderkopf eine Brennkraftmaschine Download PDF

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Publication number
EP0416600A1
EP0416600A1 EP90117130A EP90117130A EP0416600A1 EP 0416600 A1 EP0416600 A1 EP 0416600A1 EP 90117130 A EP90117130 A EP 90117130A EP 90117130 A EP90117130 A EP 90117130A EP 0416600 A1 EP0416600 A1 EP 0416600A1
Authority
EP
European Patent Office
Prior art keywords
hole
head
cylinder
cylinder head
head bolt
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.)
Withdrawn
Application number
EP90117130A
Other languages
English (en)
French (fr)
Inventor
Yutaka Matayoshi
Shigeru Kamegaya
Shigeo Muranaka
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.)
Nissan Motor Co Ltd
Original Assignee
Nissan 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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Publication of EP0416600A1 publication Critical patent/EP0416600A1/de
Withdrawn legal-status Critical Current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
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • 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
    • 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
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to improvements in a cylinder head structure with which an engine is improved with respect to its performances and size.
  • an internal combustion engine uses a valve mechanism having double overhead camshafts (DOHC) which are provided to operate two intake valves and two exhaust valves for each cylinder of the engine.
  • DOHC double overhead camshafts
  • a cylinder head used for such a DOHC engine is disclosed, for example, in Japanese Patent Publication No. 1-­22464.
  • a rocker arm of the end pivot type is disposed between each of the camshafts and each of the intake and exhaust valves so that the intake and exhaust valves can be sufficiently lifted.
  • Each pivot for supporting each rocker arm is disposed at a nearer position than the camshaft relative to a cylinder axis and is installed in a boss which is formed around a spark plug boss of each cylinder.
  • Other configurations such as oil passages for supplying the oil to the pivots are located on the central part of the cylinder head.
  • a cylinder head of a double overhead camshaft internal combustion engine comprises a plurality of bearing sections disposed in the vicinity of each cylinder of the engine.
  • the bearing sections support two camshafts of the engine.
  • a head bolt is inserted through a first hole which vertically extends and passes through each bearing section.
  • a second hole vertically extends and is connected and coaxial with the first hole. The second hole is located under the first hole and opens to outside of the cylinder head. The second hole receives the head bolt with which the cylinder head is fixedly secured to a cylinder block.
  • each of the bearing sections is formed to have the first hole under which the second hole is formed, the head bolt and bearing section can be disposed in the vicinity of each of the cylinders.
  • the rocker arm is formed in a Y-shape and operates two valves of the intake or exhaust system, a space for the pivot will be formed at a side section of the cylinder head.
  • each swinging end of the rocker arm for the intake valve and that of the exhaust valve can be disposed opposite to each other so that the axis of the intake valve stem and the axis of the exhaust valve stem can form a small angle therebetween. Therefore, the upper surface of the combustion chamber of the pentroof type becomes flatter, so that the engine can have a high compression ratio while becoming small in size.
  • a first embodiment of a cylinder head 1 forms part of a four cylinder internal combustion engine having double overhead camshafts (DOHC).
  • DOHC double overhead camshafts
  • Two intake valves 51 and two exhaust valves 52 are provided for each cylinder (not shown) of the engine.
  • the cylinder head 1 has a spark plug boss 11 located on the central part of each of the cylinders.
  • the intake and exhaust valves 51, 52 are slidably installed respectively in valve bosses 12, 13 which are so located as to surround the spark plug boss 11.
  • Bearing sections 14, 15 are formed on the cylinder head 1 and located respectively in the vicinity of each cylinder or in such positions as to surround each cylinder.
  • the bearing sections 14 support an intake valve camshaft 44 which operates the intake valves 51.
  • the bearing sections 15 support an exhaust valve camshaft 45 which operates the exhaust valves 52.
  • Each of the bearing sections 14, 15 and the spark plug boss 11 are interconnected with a rib 20 so that an engine rigidity is improved.
  • each of the bearing sections 14, 15 has a head bolt insertion-hole 16, 17 which vertically extends through the bearing sections 14, 15.
  • the head bolt insertion-hole 16, 17 is aligned and communicates with head bolt hole 18, 19 which vertically extends to be coaxial with the head bolt insertion-hole 16, 17, so that the aligned head bolt insertion-hole and head bolt hole pass through the cylinder head 1.
  • Head bolts 7 for connecting the cylinder head 1 and a cylinder block 9 are installed in a state that the head of the head bolt 7 is mounted on the shoulder formed between the head bolt hole 18, 19 and the head bolt insertion-hole 16, 17. The threaded section of the head bolt 7 is screwed into the cylinder block 9.
  • the head bolts 7 can be disposed between the cylinders at predetermined intervals to fixedly secure the cylinder head 1 on the cylinder block 9 through a gasket (not shown), so that a good sealing is obtained between the cylinder block 9 and the cylinder head 1.
  • each rocker arm 2, 3 is movably installed on the cylinder head 1.
  • one end section of the rocker arm 2, 3 is bifurcated into two portions which are respectively brought into contact with the top ends (no numeral) of the intake and exhaust valves 51, 52.
  • the other end of each rocker arm 2, 3 is pivotally supported by each pivot 41, 42 on the cylinder head 1.
  • the pivot 41, 42 is disposed in each pivot installation hole 21, 22 which is formed in the boss section 28, 29.
  • the boss section 28, 29 is disposed adjacent each side wall 23, 24 whose surface forms part of the peripheral surface of the cylinder head 1.
  • the side walls 23, 24 are generally parallel with the axis of the camshaft 44, 45.
  • an imaginary vertical plane V including an axis of the cylinder head in Fig. 1, 2 and 3.
  • the pivot 41, 42 is located outside of the camshaft relative to the vertical plane V.
  • the cylinder head 1 is formed with an intake port 4 of a siamese shape.
  • the intake port 4 has one passage 4a at its upstream side and is branched into two passages 4b communicable with each cylinder so that intake air is guided into each cylinder with the two passages 4b of each intake port 4.
  • the pivot installation hole 21 is formed between the two passages 4b of the intake port 4 with a predetermined depth.
  • a hydraulic rash adjuster 46, 47 is inserted in each of the pivot installation holes 21, 22 so that the pivot 41, 42 is supported under a hydraulic power.
  • the pivot installation holes 21, 22 are connected respectively with holes 30a, 30b through which remained air is discharged when the rash adjuster 46, 47 is inserted in each of the pivot installation holes 21, 22.
  • valve guide 31, 32 of a tube-shape is inserted into each hole (no numeral) which is formed at the valve boss 12, 13.
  • valve seats 33, 34 are provided respectively at the ends of the intake and exhaust ports 4, 5.
  • Numeral 35 indicates water jackets through which cooling water flows to cool the engine.
  • a pair of generally straight oil passages 25, 26 are formed in the cylinder head 1 to connect the pivot installation holes 21, 22 with each other.
  • the hydraulic oil is supplied to each rash adjuster 46, 47 through the oil passage 25, 26 and lubricates a sliding surface of the pivot 41, 42.
  • Each camshaft bracket 6 is fixedly secured on each of the bearing sections 14, 15 with two bolts in order to support each of the camshafts 44, 45.
  • a pipe-shaped member 8 defining therein an oil passage is disposed on the camshaft bracket 6 so that the lubricating oil is sprayed over the sliding surfaces of the camshafts 44, 45 and of the stems of the intake and exhaust valves 51, 52.
  • the head bolt 7 and a tightening tool thereof are set over the head bolt hole 18, 19 through the head bolt insertion-hole 16, 17 which vertically passes through the cylinder head 1 and is formed through each bearing section 14, 15 before the cylinder head 1 and the cylinder block 9 are secured to each other with the head bolts 7.
  • the head bolt hole 18, 19 is formed located under the bearing section 14, 15, the head bolt 7 and the bearing section 14, 15 can be positioned in the vicinity of the cylinder.
  • the boss 28, 29 for the pivot installation hole 21, 22 can be formed at a position far from the spark plug boss 11 as compared with the bearing sections 14, 15 and in the vicinity of the side wall 23, 24 of the cylinder head 1.
  • each swinging end of the rocker arm 2 for the intake valves 51 and that of the rocker arm 3 for the exhaust valves 52 can be disposed opposite to each other, the angle defined between the stems of the intake and exhaust valves 51, 52 can become small without being restricted by the length of the rocker arm 2, 3. This can make flatter the inclination of the upper surface of the combustion chamber, thereby contributing to setting the compression ratio of the internal combustion engine at a high value. Additionally, since the distance between the intake and exhaust camshafts can be suppressed relatively short, the lateral width of the cylinder head becomes short.
  • Figs. 5 and 6 illustrate a second embodiment of the cylinder head 1 similar to the first embodiment.
  • each camshaft bracket 36, 37 is integrally formed in a beam shape and has each oil passage 38, 39 therein.
  • the lubricating oil is sprayed from the oil passage 38, 39 to the sliding surfaces of the camshafts 44, 45 and the stems of the valves 51, 52 through injection holes (not shown) which are formed in the camshaft brackets 36, 37.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP90117130A 1989-09-05 1990-09-05 Zylinderkopf eine Brennkraftmaschine Withdrawn EP0416600A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP23006289A JPH0392573A (ja) 1989-09-05 1989-09-05 内燃機関のシリンダヘッド
JP230062/89 1989-09-05

Publications (1)

Publication Number Publication Date
EP0416600A1 true EP0416600A1 (de) 1991-03-13

Family

ID=16901956

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90117130A Withdrawn EP0416600A1 (de) 1989-09-05 1990-09-05 Zylinderkopf eine Brennkraftmaschine

Country Status (2)

Country Link
EP (1) EP0416600A1 (de)
JP (1) JPH0392573A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0515925A1 (de) * 1991-05-25 1992-12-02 Klöckner-Humboldt-Deutz Aktiengesellschaft Zylinderkopf für eine Brennkraftmaschine
DE4417480C1 (de) * 1994-05-19 1995-05-04 Audi Ag Zylinderkopf für eine Brennkraftmaschine
DE19542495C1 (de) * 1995-11-15 1997-01-16 Daimler Benz Ag Gegossener Zylinderkopf einer mehrzylindrigen Brennkraftmaschine
WO1997044576A1 (de) * 1996-05-22 1997-11-27 Audi Ag Zylinderkopf für eine mehrzylindrige brennkraftmaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4641609A (en) * 1985-01-19 1987-02-10 Mazda Motor Corporation Cylinder head for DOHC engine
DE3545448A1 (de) * 1985-12-20 1987-06-25 Bayerische Motoren Werke Ag Hubkolben-brennkraftmaschine, insbesondere mehrzylinder-reihenbrennkraftmaschine, mit einem gesonderten zylinderkopf
EP0323233A1 (de) * 1987-12-28 1989-07-05 Honda Giken Kogyo Kabushiki Kaisha Schmiereinrichtung für mehrzylindrische Brennkraftmaschinen mit zwei obenliegenden Nockenwellen
GB2216187A (en) * 1988-02-22 1989-10-04 Nissan Motor Oil return from a cylinder head for dohc i.c. engine with four valves per cylinder

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4641609A (en) * 1985-01-19 1987-02-10 Mazda Motor Corporation Cylinder head for DOHC engine
DE3545448A1 (de) * 1985-12-20 1987-06-25 Bayerische Motoren Werke Ag Hubkolben-brennkraftmaschine, insbesondere mehrzylinder-reihenbrennkraftmaschine, mit einem gesonderten zylinderkopf
EP0323233A1 (de) * 1987-12-28 1989-07-05 Honda Giken Kogyo Kabushiki Kaisha Schmiereinrichtung für mehrzylindrische Brennkraftmaschinen mit zwei obenliegenden Nockenwellen
GB2216187A (en) * 1988-02-22 1989-10-04 Nissan Motor Oil return from a cylinder head for dohc i.c. engine with four valves per cylinder

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0515925A1 (de) * 1991-05-25 1992-12-02 Klöckner-Humboldt-Deutz Aktiengesellschaft Zylinderkopf für eine Brennkraftmaschine
DE4417480C1 (de) * 1994-05-19 1995-05-04 Audi Ag Zylinderkopf für eine Brennkraftmaschine
DE19542495C1 (de) * 1995-11-15 1997-01-16 Daimler Benz Ag Gegossener Zylinderkopf einer mehrzylindrigen Brennkraftmaschine
US5730095A (en) * 1995-11-15 1998-03-24 Mercedes-Benz A.G. Cast cylinder head of a multi-cylinder internal combustion engine
DE19542495C5 (de) * 1995-11-15 2005-08-04 Daimlerchrysler Ag Gegossener Zylinderkopf einer mehrzylindrigen Brennkraftmaschine
WO1997044576A1 (de) * 1996-05-22 1997-11-27 Audi Ag Zylinderkopf für eine mehrzylindrige brennkraftmaschine
CN1080822C (zh) * 1996-05-22 2002-03-13 奥迪股份公司 多缸内燃机汽缸盖

Also Published As

Publication number Publication date
JPH0392573A (ja) 1991-04-17

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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