EP0313140A1 - Dispositif de distribution pour moteur à combustion interne à puissance spécifique élevée - Google Patents

Dispositif de distribution pour moteur à combustion interne à puissance spécifique élevée Download PDF

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Publication number
EP0313140A1
EP0313140A1 EP88202217A EP88202217A EP0313140A1 EP 0313140 A1 EP0313140 A1 EP 0313140A1 EP 88202217 A EP88202217 A EP 88202217A EP 88202217 A EP88202217 A EP 88202217A EP 0313140 A1 EP0313140 A1 EP 0313140A1
Authority
EP
European Patent Office
Prior art keywords
valves
finger
intake
camshaft
exhaust
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Withdrawn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
EP88202217A
Other languages
German (de)
English (en)
Inventor
Carlo Chiti
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.)
MOTORI MODERNI Srl
Original Assignee
MOTORI MODERNI Srl
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 MOTORI MODERNI Srl filed Critical MOTORI MODERNI Srl
Publication of EP0313140A1 publication Critical patent/EP0313140A1/fr
Withdrawn legal-status Critical Current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
    • F01L1/26—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
    • F02B2275/18—DOHC [Double overhead camshaft]

Definitions

  • the three intake valves must be arranged with at least one of them having the stem out of parallel with the other two so as to bring the upper parts of said stems all on the same axis and thus capable of being driven by a single camshaft, since it would be impossible to arrange the three valves on the same axis directly because of lack of space and also due to the design of the combustion chamber.
  • a similar problem arises if it is desired to build an engine with more than two exhaust valves. All this involves a reduction in the designer's freedom of choice regarding the form of the combustion chamber and consequently leads in the end to a reduction in the engine's performance compared with the performance theoretically possible.
  • the general purpose of the present invention is to avoid the drawbacks mentioned above by a device for controlling the valves of an internal combustion engine which would provide control of the valves in a simple manner if they are more than two in number for exhaust and/or similarly more than two for intake, by means of a single camshaft for each group of intake of exhaust valves and with the axes of the valves of each of said groups mutually parallel to permit design of a combustion chamber with optimal characteristics.
  • the device which will now be described is an example of a possible application of the principles of the present invention to an engine having five valves per cylinder divided in three intake valves 10 and two exhaust valves 11.
  • the five valves are arranged symmetrically on the cylinder 12 with regard to the axis of said cylinder and equidistant therefrom.
  • the exhaust valves 11, which are arranged with their stems 13 parallel are controlled, each through a guide socket 14, by a single camshaft 15, while the intake valves 10, which are also parallel with their stems 16, are controlled by a second camshaft 17.
  • the two intake valves 10 most distant from each other are each controlled directly through a guide socket by lateral cams 19 of said shaft 17 while the central intake valve 10 is controlled through a "finger" rocker arm 20 which is pivoted at one of its ends by means of a ball pin 21 to a part 22 integral with the cylinder 12 while its other end 23 rests on the free end of the stem 16 of said central valve.
  • Said "finger" rocker arm 20, which is placed in the space between the two guide sockets 18 (as may be seen clearly in FIG. 3) is in turn controlled by another cam 24 of the camshaft 17 placed centrally with respect to the two side cams 19 of said shaft which controls the intake valves 10 most distant from one another.
  • Said other cam 24 has lift reduced by a certain ratio rho with respect to the two laterals 19 while the "finger" rocker arm 23 achieves a transmission ratio of 1/rho in such a manner as to cause the central intake valve to open and close in unison and with the same amplitude of movement as the two lateral intake valves.
  • valves having homologous operation By the number of valves selected the advantages of the application of the principles of the present invention are substantial, it being possible to control all the valves having homologous operation by a single camshaft while at the same time it is possible to arrange the valves on an ideal circumference concentric with the cylinder and with a relative orientation at will (in particular valves having homologous operation with the axes mutually parallel) securing the advantage of being able to make chambers with optimal shape for combustion quality but also facilitating the solution of construction problems. Furthermore it is possible to use guide sockets of normal dimensions for the valves controlled directly by the camshaft since the "finger" rocker arm occupies little transverse space and, allowing considerable design freedom, can be inserted in the space between said guide sockets to reach the valves to be controlled.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP88202217A 1987-10-23 1988-10-06 Dispositif de distribution pour moteur à combustion interne à puissance spécifique élevée Withdrawn EP0313140A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2239487 1987-10-23
IT22394/87A IT1222976B (it) 1987-10-23 1987-10-23 Dispositivo di distribuzione perfezionato per motori a combustione interna ad elevata potenza specifica

Publications (1)

Publication Number Publication Date
EP0313140A1 true EP0313140A1 (fr) 1989-04-26

Family

ID=11195699

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88202217A Withdrawn EP0313140A1 (fr) 1987-10-23 1988-10-06 Dispositif de distribution pour moteur à combustion interne à puissance spécifique élevée

Country Status (3)

Country Link
EP (1) EP0313140A1 (fr)
JP (1) JPH01134008A (fr)
IT (1) IT1222976B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0412064A1 (fr) * 1989-08-04 1991-02-06 FIAT AUTO S.p.A. Culasse pour un moteur à combustion interne avec cinq soupages par cylindre
EP0420139A1 (fr) * 1989-09-28 1991-04-03 Mazda Motor Corporation Moteur multisoupape
EP0541131A1 (fr) * 1989-11-29 1993-05-12 Yamaha Hatsudoki Kabushiki Kaisha Moteur à combustion interne multisoupape

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4637356A (en) * 1984-08-15 1987-01-20 Yamaha Hatsudoki Kabushiki Kaisha Valve actuating mechanism for internal combustion engine
US4667636A (en) * 1985-03-22 1987-05-26 Toyota Jidosha Kabushiki Kaisha Fuel injection type internal combustion engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4637356A (en) * 1984-08-15 1987-01-20 Yamaha Hatsudoki Kabushiki Kaisha Valve actuating mechanism for internal combustion engine
US4667636A (en) * 1985-03-22 1987-05-26 Toyota Jidosha Kabushiki Kaisha Fuel injection type internal combustion engine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0412064A1 (fr) * 1989-08-04 1991-02-06 FIAT AUTO S.p.A. Culasse pour un moteur à combustion interne avec cinq soupages par cylindre
EP0420139A1 (fr) * 1989-09-28 1991-04-03 Mazda Motor Corporation Moteur multisoupape
EP0541131A1 (fr) * 1989-11-29 1993-05-12 Yamaha Hatsudoki Kabushiki Kaisha Moteur à combustion interne multisoupape

Also Published As

Publication number Publication date
IT8722394A0 (it) 1987-10-23
IT1222976B (it) 1990-09-12
JPH01134008A (ja) 1989-05-26

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