EP0262250B1 - Moteur à combustion interne à quatre temps - Google Patents

Moteur à combustion interne à quatre temps Download PDF

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Publication number
EP0262250B1
EP0262250B1 EP19860113585 EP86113585A EP0262250B1 EP 0262250 B1 EP0262250 B1 EP 0262250B1 EP 19860113585 EP19860113585 EP 19860113585 EP 86113585 A EP86113585 A EP 86113585A EP 0262250 B1 EP0262250 B1 EP 0262250B1
Authority
EP
European Patent Office
Prior art keywords
valves
axis
tappets
rotation
combustion engine
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
EP19860113585
Other languages
German (de)
English (en)
Other versions
EP0262250A1 (fr
Inventor
Max Ruf
Erwin Korostenski
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.)
Audi AG
Original Assignee
Audi AG
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 to DE19853524622 priority Critical patent/DE3524622A1/de
Application filed by Audi AG filed Critical Audi AG
Priority to EP19860113585 priority patent/EP0262250B1/fr
Priority to DE8686113585T priority patent/DE3669559D1/de
Publication of EP0262250A1 publication Critical patent/EP0262250A1/fr
Application granted granted Critical
Publication of EP0262250B1 publication Critical patent/EP0262250B1/fr
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
    • F01L1/26—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
    • 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
    • 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
    • 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
    • F02B2275/18—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

Definitions

  • the invention relates to a four-stroke internal combustion engine according to the preamble of claim 1.
  • the invention has for its object to provide a four-stroke internal combustion engine of the type specified in the preamble of claim 1, in which a trouble-free accommodation of the tappets is possible without weakening the cylinder head.
  • the longitudinal central axis of at least the middle of the three tappets which are assigned to the inlet and / or exhaust valves, does not intersect the axis of rotation of the camshaft, but runs at a distance from it, results in bores receiving the adjacent tappets a greater wall thickness in the cylinder head, so that sufficient strength for the cylinder head is ensured at this point.
  • This effect can be intensified if the central axes of the bucket tappets of the two outer of the three intake and exhaust valves are laterally offset with respect to the axis of rotation of the camshaft, but towards the other side of the camshaft.
  • the central longitudinal axes of the tappets can coincide with the central longitudinal axes of the associated valves. In this case, the valves are tilted accordingly so that their longitudinal central axes do not intersect the axis of rotation of the camshaft.
  • the longitudinal central axes of the tappets can be laterally offset with respect to the longitudinal central axes of the associated valves. In both cases, the arrangement can be such that the cams hit the relevant tappets not in the middle, but laterally, whereby rotation of the valve tappet and the associated valve is achieved and wear is reduced.
  • the cylinder head 1 shown in the drawings has three intake valves 3, 4 and 5 and two exhaust valves 6 and 7 for each cylinder, i.e. for each combustion chamber 2.
  • Each of these valves carries at its end facing away from the combustion chamber 2 a bucket tappet 8a to 8c which is displaceably guided in a bore 9 in the cylinder head upper part 10.
  • the inlet valves 3, 4 and 5 are actuated via their bucket tappets 8a to 8c by the cams 11, 12 and 13 of a camshaft 14 indicated in FIG. 4.
  • a second camshaft 15 with cams 16 is used to actuate the exhaust valves 6, 7, only one of which is shown in the drawing.
  • the valves are pressed onto their valve seat in the usual way by springs.
  • a spark plug bore 17 is provided in the middle of the combustion chamber 2.
  • the tappets 8a, 8b and 8c are arranged in such a way that their longitudinal central axes 18, 19 and 20 do not intersect the axis of rotation 21 of the camshaft 14, as is usual, but instead run at a distance from it.
  • the bores 9 for receiving these bucket tappets are thus offset from one another, as can be seen in FIG. 4, namely that the longitudinal center line 19 of the middle bucket tappet 8b penetrates the plane 22 through the axis of rotation 21 of the camshaft 14 at right angles to this longitudinal center axis 19 ( 2) in FIGS. 2 and 4 to the right of the camshaft axis of rotation 21 at a distance a.
  • the longitudinal center axes 18 and 20 of the two outer tappets 8a and 8c penetrate said plane 20 in FIGS. 3 and 4 to the left of the camshaft axis of rotation 21 at a distance b.
  • the size of the lateral offset depends on the available space. Often it may be sufficient to arrange only the tappet 8b of the central inlet valve 4 such that its longitudinal center line 19 penetrates the plane 22 at a distance from the camshaft axis of rotation 21.
  • the lateral offset of the longitudinal center line 19 can be achieved in this way, that the valve 4 is installed with a corresponding inclination.
  • the valve 3 or 5 can be arranged in the usual way such that its longitudinal center line 23 intersects the camshaft axis of rotation 21, but the bucket tappet 8a or 8c is arranged eccentrically to the valve 3 or 5, so that its longitudinal center axis 18 or 20 penetrates the plane 22 at a distance b from the camshaft axis of rotation 21.
  • the tappets 8a and 8c of the valves 3 and 5 are arranged in such a way that their longitudinal central axis 18 or 20 penetrates the plane 22 at a distance b in the direction of rotation D of the cam 11 or 13.
  • a relatively large valve lift and thus a large flow cross-section is achieved in the first third of the entire valve lift, in which the greatest pressure drop prevails, as a result of which the filling is improved in the case of intake valves and the combustion gases are expelled more quickly in the case of exhaust valves.
  • the cams 11, 12 and 13 act centrally on the cup tappets 8a, 8b and 8c.
  • three intake valves and two exhaust valves are provided per cylinder.
  • the invention is also applicable to internal combustion engines with three intake valves and three exhaust valves per cylinder, in which case the tappets of the exhaust valves are expediently arranged as described above with respect to the tappets of the intake valves.

Landscapes

  • 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)

Claims (3)

1. Moteur à combustion interne à quatre temps équipé de trois soupapes d'admission ou de trois soupapes d'échappement ou de trois soupapes d'admission et de trois soupapes d'échappement par cylindre, comprenant un premier arbre à cames pour les soupapes d'admission et un second arbre à cames pour les soupapes d'échappement dont les cames agissent sur les soupapes par l'intermédiaire de poussoirs à cloche, caractérisé en ce qu'au moins l'axe longitudinal médian (19) du poussoir à cloche (8b) associé à la soupape médiane (4) des trois soupapes d'admission et/ou des trois soupapes d'échappement (3, 4, 5) traverse le plan (22) passant par l'axe de rotation (21) de l'arbre à cames considéré (14), à angle droit par rapport audit axe longitudinal médian (19), à une distance (a) de l'axe de rotation (21) de l'arbre à cames (14).
2. Moteur à combustion interne à quatre temps selon la revendication 1, caractérisé en ce que les axes longitudinaux médians (18, 20) des deux poussoirs à cloche (8a, 8c) associés aux deux soupapes extérieures (3, 5) des trois soupapes d'admission et/ou d'échappement (3, 4, 5) traversent ledit plan (22) également à une distance (þ), mais de l'autre côté de l'axe de rotation de l'arbre à cames (14).
3. Moteur à combustion interne à quatre temps selon l'une des revendications 1 ou 2, caractérisé en ce que l'axe longitudinal médian ou les axes longitudinaux médians (18, 20) du et respectivement des poussoir(s) à cloche (8a, 8c) est et respectivement sont décalé(s) latéralement par rapport à l'axe longitudinal médian (23) de la et respectivement des soupape(s) correspondante(s) (3, 5).
EP19860113585 1985-07-10 1986-10-02 Moteur à combustion interne à quatre temps Expired - Lifetime EP0262250B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19853524622 DE3524622A1 (de) 1985-07-10 1985-07-10 Viertakt-brennkraftmaschine
EP19860113585 EP0262250B1 (fr) 1986-10-02 1986-10-02 Moteur à combustion interne à quatre temps
DE8686113585T DE3669559D1 (de) 1986-10-02 1986-10-02 Viertakt-brennkraftmaschine.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19860113585 EP0262250B1 (fr) 1986-10-02 1986-10-02 Moteur à combustion interne à quatre temps

Publications (2)

Publication Number Publication Date
EP0262250A1 EP0262250A1 (fr) 1988-04-06
EP0262250B1 true EP0262250B1 (fr) 1990-03-14

Family

ID=8195470

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860113585 Expired - Lifetime EP0262250B1 (fr) 1985-07-10 1986-10-02 Moteur à combustion interne à quatre temps

Country Status (2)

Country Link
EP (1) EP0262250B1 (fr)
DE (1) DE3669559D1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1217503B (it) * 1988-05-05 1990-03-22 Motori Moderni Srl Sistema di valvola e relativi comandi di azionamento per motore a combustione interna ad elevata potenza specifica
DE3943727C2 (de) * 1989-12-11 1995-07-13 Porsche Ag Zylinderkopf einer Brennkraftmaschine
FR2656654A1 (fr) * 1989-12-29 1991-07-05 Peugeot Dispositif d'actionnement d'une soupape de moteur a combustion.
FR2656898B1 (fr) * 1990-01-11 1992-05-15 Peugeot Agencement de soupapes dans un moteur a combustion.
IT1241185B (it) * 1990-03-02 1993-12-29 Ferrari Spa Sistema di distribuzione, in particolare per un motore endotermico a piu' valvole per cilindro.
US5094197A (en) * 1991-03-01 1992-03-10 Ferrari S.P.A. Timing system, particularly for an internal combustion engine with a number of valves per cyclinder
JP2000120413A (ja) 1998-10-12 2000-04-25 Isuzu Motors Ltd 多弁式ｄｏｈｃエンジンのバルブ駆動機構

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57176311A (en) * 1981-04-22 1982-10-29 Yamaha Motor Co Ltd Four-cycle engine
JPH0646004B2 (ja) * 1984-04-11 1994-06-15 ヤマハ発動機株式会社 内燃機関のカム軸保持構造
DE3524622A1 (de) * 1985-07-10 1987-01-15 Audi Ag Viertakt-brennkraftmaschine

Also Published As

Publication number Publication date
EP0262250A1 (fr) 1988-04-06
DE3669559D1 (de) 1990-04-19

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