EP0444562A1 - Timing system, particularly for an internal combustion engine with a number of valves per cylinder - Google Patents

Timing system, particularly for an internal combustion engine with a number of valves per cylinder Download PDF

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Publication number
EP0444562A1
EP0444562A1 EP91102713A EP91102713A EP0444562A1 EP 0444562 A1 EP0444562 A1 EP 0444562A1 EP 91102713 A EP91102713 A EP 91102713A EP 91102713 A EP91102713 A EP 91102713A EP 0444562 A1 EP0444562 A1 EP 0444562A1
Authority
EP
European Patent Office
Prior art keywords
camshaft
axis
valves
timing system
valve
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Withdrawn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
EP91102713A
Other languages
German (de)
English (en)
French (fr)
Inventor
Riccardo Rosa
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.)
Ferrari SpA
Original Assignee
Ferrari SpA
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 Ferrari SpA filed Critical Ferrari SpA
Publication of EP0444562A1 publication Critical patent/EP0444562A1/en
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • F02B2275/20—SOHC [Single overhead camshaft]

Definitions

  • the present invention relates to a timing system for regulating, via respective camshaft-controlled valves, fluid input or output to/from one or more cylinders of an engine and/or machine.
  • the present invention relates to an overhead camshaft timing system for an internal combustion engine featuring a number of valves, e.g. five, per cylinder.
  • 4.615.309 provides for a spread arrangement of the supply valves, the middle one being arranged obliquely in relation to the two lateral valves, thus enabling all three to be controlled by a single camshaft, and for using tappets with smaller than normal diameter caps, in the example shown, smaller than the caps on the exhaust valves.
  • the aim of the present invention is to provide a timing system, particularly for high-performance internal combustion engines, designed to overcome the aforementioned drawbacks, i.e. which is both compact and straightforward to produce, and enables the obtainment of valve ports of as large a size as possible.
  • a timing system particularly for an internal combustion engine, whereby a camshaft controls, against the action of elastic means, the translation of respective stems of a number of adjacent service valves for regulating the input or output of a fluid from a respective cylinder; each said valve being controlled by a respective cam of said camshaft via the interposition of a respective tappet; characterised by the fact that the respective axes of said valve stems are arranged eccentrically and on alternate opposite sides in relation to the axis of the respective tappet, so as to define a first predetermined eccentricity between the axis of each tappet and the axis of the corresponding valve stem.
  • Number 1 in Fig.s 1 to 3 indicates a known internal combustion engine of which is illustrated, for the sake of simplicity, only the top portion comprising a cylinder head 2 and, underneath, a single cylinder 3 defining, together with cylinder head 2, one of the combustion chambers of engine 1.
  • Engine 1 presents a timing system indicated as a whole by 4 and comprising, in the non-limiting example shown, five service valves for each cylinder 3: three adjacent supply valves 5 and 6; and two adjacent known exhaust valves (not shown). All the above valves are mushroom types for opening/closing respective intake ports 7 and exhaust ports 8 of cylinder 3. Said ports are formed in a ring on cylinder head 2, on top of the combustion chamber defined by cylinder head 2 and respective cylinder 3, and are arranged substantially in the form of a pentagon.
  • Timing system 4 also comprises a respective camshaft 10 for simultaneously controlling all the valves 5 and 6 of all the cylinders 3 on engine 1; and a similar known camshaft (not shown) for controlling in known manner the valves of exhaust ports 8 of all the cylinders 3 on engine 1.
  • shaft 10 comprises a respective control cam 11 of predetermined shape, for controlling translation of a respective valve stem 13 via the interposition of a respective known tappet 12 and against the action of respective elastic means 15.
  • timing system 4 presents an overhead camshaft arrangement, i.e. wherein cams 11 of camshaft 10 cooperate directly with tappets 12, camshaft 10 being arranged so as to turn about an axis 14 (indicated in Fig.1 by a point defining its projection) corresponding directly with ports 7.
  • Tappets 12 may be mechanical types with no slack adjustment, as in the non-limiting example shown, or any known hydraulic type with automatic slack takeup.
  • each tappet 12 comprises a cylindrical cap 16 housed in axially sliding manner inside a guide seat 18 formed in cylinder head 2; and a plate 19 on top of cap 16 and between this and respective cam 11. Cylindrical cap 16 defines the outer body of each tappet 12, the axis of which is therefore defined by the longitudinal axis of symmetry 20 of cap 16 (Fig.2).
  • each stem 13 of valves 5 and 6 presents its longitudinal axis of symmetry 21 offset in relation to axis 20 of respective tappet 12.
  • axes 21 are arranged eccentrically on alternate opposite sides of axis 20 of respective tappet 12, so as to define a first predetermined eccentricity e1 (Fig.2) between axis 20 of each tappet 12 and axis 21 of respective valve stem 13.
  • axes 20 of tappets 12 are shifted laterally on alternate opposite sides in relation to the axis of rotation 14 (the transverse position of which is shown by perpendicular line 14 a in Fig.2) of camshaft 10 on the side of respective valve stems 13, so as to define a second predetermined eccentricity e2 between axis 14 of camshaft 10 and axis 20 of each tappet 12.
  • valve 5, which is located between said two valves 6, is also inclined in relation to valves 6, so that axis 21 of stem 13 of valve 5 diverges towards respective cylinder 3 in relation to those of valves 6 (Fig.1).
  • axes 21 of stems 13 of all three valves 5, 6, when projected in a transverse plane in relation to axis 14, converge at a point (not shown) some distance from and over axis 14 of camshaft 10.
  • eccentricity e2 and the size of respective plate 19 are so selected that each cam 11 of camshaft 10 cooperates exclusively with, and exclusively within the horizontal confines of, plate 19 of respective tappet 12.
  • Said elastic contrasting means of valves 5 and 6 comprise respective helical springs 15 wound coaxially about stems 13 and housed inside the top of tappets 12, in the example shown, inside caps 16, together with a respective shoulder plate 30 for and integral with each valve stem 13. Via a conical surface 31 flaring towards respective plate 19, each shoulder plate 30 cooperates with a pair of known cotters 32 secured axially integral with stem 13 via engagement inside a groove 33 on the same.
  • the end of stem 13 cooperates with cap 16, while, opposite tappet 12, spring 15 rests on the bottom wall of guide seat 18, thus providing for a continuous control mechanism for controlling translation of valves 5 and 6 along the axis of stems 13.
  • valve stems 13 in relation to the axis of tappets 12 and of tappets 12 in relation to the axis of rotation of camshaft 10, and the diverging arrangement of central supply valve 5 and the two lateral supply valves 6 provide for obtaining a five-valve timing system featuring three large, widely spaced supply ports (for adequate cooling and safeguarding the cylinder head) despite the three valves being controlled by a single, and what is more, overhead camshaft. This therefore results in a highly efficient, high-performance internal combustion engine timing system, which is also highly compact.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
EP91102713A 1990-03-02 1991-02-25 Timing system, particularly for an internal combustion engine with a number of valves per cylinder Withdrawn EP0444562A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT6714990 1990-03-02
IT67149A IT1241185B (it) 1990-03-02 1990-03-02 Sistema di distribuzione, in particolare per un motore endotermico a piu' valvole per cilindro.

Publications (1)

Publication Number Publication Date
EP0444562A1 true EP0444562A1 (en) 1991-09-04

Family

ID=11299994

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91102713A Withdrawn EP0444562A1 (en) 1990-03-02 1991-02-25 Timing system, particularly for an internal combustion engine with a number of valves per cylinder

Country Status (3)

Country Link
EP (1) EP0444562A1 (ja)
JP (1) JP2607763B2 (ja)
IT (1) IT1241185B (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0692613A1 (en) * 1994-06-17 1996-01-17 Yamaha Hatsudoki Kabushiki Kaisha Internal combustion engine and method for supplying air into a combustion chamber of an internal combustion engine
US6276323B1 (en) 1998-10-12 2001-08-21 Isuzu Motors Limited Valve drive mechanism for DOHC engine
DE19942110B4 (de) * 1998-09-04 2005-08-11 Toyota Jidosha K.K., Toyota Ventilstößel für einen dreidimensionalen Nocken und verstellbare Ventilbetätigungsvorrichtung mit diesem Ventilstößel
CN104265391A (zh) * 2014-09-17 2015-01-07 安徽江淮汽车股份有限公司 一种发动机阀系布置结构

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007239494A (ja) * 2006-03-06 2007-09-20 Nissan Motor Co Ltd 内燃機関の可変動弁装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB296125A (en) * 1927-05-26 1928-08-27 Ettore Lanzerotti Spina Improvements in and relating to the valves and valve gear of internal combustion engines
EP0262250A1 (de) * 1986-10-02 1988-04-06 Audi Ag Viertakt-Brennkraftmaschine
EP0324092A1 (en) * 1988-01-11 1989-07-19 Yamaha Hatsudoki Kabushiki Kaisha Valve actuation device for multi-valve-type engine
EP0340834A2 (en) * 1988-05-05 1989-11-08 MOTORI MODERNI s.r.l. System of valves and related operating devices for internal combustion engines having high specific horsepower

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57186010A (en) * 1981-05-11 1982-11-16 Yamaha Motor Co Ltd Valve moving mechanism for engine with overhead cam shafts
JPH0811929B2 (ja) * 1985-07-10 1996-02-07 アウデイ アクチエンゲゼルシヤフト ４サイクル内燃機関

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB296125A (en) * 1927-05-26 1928-08-27 Ettore Lanzerotti Spina Improvements in and relating to the valves and valve gear of internal combustion engines
EP0262250A1 (de) * 1986-10-02 1988-04-06 Audi Ag Viertakt-Brennkraftmaschine
EP0324092A1 (en) * 1988-01-11 1989-07-19 Yamaha Hatsudoki Kabushiki Kaisha Valve actuation device for multi-valve-type engine
EP0340834A2 (en) * 1988-05-05 1989-11-08 MOTORI MODERNI s.r.l. System of valves and related operating devices for internal combustion engines having high specific horsepower

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0692613A1 (en) * 1994-06-17 1996-01-17 Yamaha Hatsudoki Kabushiki Kaisha Internal combustion engine and method for supplying air into a combustion chamber of an internal combustion engine
US5606942A (en) * 1994-06-17 1997-03-04 Yamaha Hatsudoki Kabushiki Kaisha Valve operating system for multi-valve engine
DE19942110B4 (de) * 1998-09-04 2005-08-11 Toyota Jidosha K.K., Toyota Ventilstößel für einen dreidimensionalen Nocken und verstellbare Ventilbetätigungsvorrichtung mit diesem Ventilstößel
DE19942110B8 (de) * 1998-09-04 2006-03-02 Toyota Jidosha K.K., Toyota Ventilstößel für einen dreidimensionalen Nocken und verstellbare Ventilbetätigungsvorrichtung mit diesem Ventilstößel
US6276323B1 (en) 1998-10-12 2001-08-21 Isuzu Motors Limited Valve drive mechanism for DOHC engine
CN104265391A (zh) * 2014-09-17 2015-01-07 安徽江淮汽车股份有限公司 一种发动机阀系布置结构

Also Published As

Publication number Publication date
IT9067149A1 (it) 1991-09-03
IT1241185B (it) 1993-12-29
JPH04219408A (ja) 1992-08-10
JP2607763B2 (ja) 1997-05-07
IT9067149A0 (it) 1990-03-02

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