EP0623737A1 - Variable Ventilsteuereinrichtung für eine Brennkraftmaschine - Google Patents

Variable Ventilsteuereinrichtung für eine Brennkraftmaschine Download PDF

Info

Publication number
EP0623737A1
EP0623737A1 EP94106967A EP94106967A EP0623737A1 EP 0623737 A1 EP0623737 A1 EP 0623737A1 EP 94106967 A EP94106967 A EP 94106967A EP 94106967 A EP94106967 A EP 94106967A EP 0623737 A1 EP0623737 A1 EP 0623737A1
Authority
EP
European Patent Office
Prior art keywords
lever
ramp
distribution device
variable
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Withdrawn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
EP94106967A
Other languages
English (en)
French (fr)
Inventor
Guy Eberhardt
Guy Thivin
Christjan Lahcem
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.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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 Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of EP0623737A1 publication Critical patent/EP0623737A1/de
Withdrawn legal-status Critical Current

Links

Images

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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • 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
    • F01L1/267—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 with means for varying the timing or the lift of the valves

Definitions

  • the present invention relates to a variable distribution device making it possible to adapt the law of lifting of the intake and / or exhaust valves of an internal combustion engine, so as to improve the performance of the latter.
  • variable distribution devices comprising for each intake valve at least two control cams, the first cam being intended to operate l opening of the valve at low load and the second opening at full load.
  • the first cam the profile of which fits into the profile of the second, cooperates with a first rocker arm or tilting lever enabling the valve to be actuated, while the second cam cooperates with a second lever selectively coupled with the first to obtain more large valve lift.
  • the present invention relates to a simple embodiment of such a variable dispensing device, allowing a low cost price and a high reliability of use.
  • variable distribution device is characterized in that the operating means for coupling and uncoupling the second lever to the first, comprise two antagonistic thrust assemblies carried directly by the ramp.
  • the maneuvering means comprise a first assembly permanently urging the second lever in the uncoupling position and a second assembly selectively biasing the second lever in the coupling position, against the action of the first assembly, according to the values taken by one or more engine operating parameters.
  • the second lever has lateral recesses corresponding to lugs projecting from the side face of the first lever extending opposite the second lever.
  • the first thrust assembly comprises a helical return spring extending around the ramp, pressing against each of the levers.
  • the second thrust assembly comprises a hydraulic cylinder selectively supplied with oil under pressure from the ramp in which an oil supply duct is arranged.
  • the second lever constitutes the movable part of the jack, the second lever comprising for this purpose a bearing surface forming a piston extending on the side opposite to the first lever and sliding along the guide wall of the body of the pusher carried by the ramp.
  • the body of the jack is formed by a cylindrical piece fitted on the ramp, the outer surface of which defines the guide wall, the second lever having a corresponding central bore capable of sliding. along this guide wall.
  • the cylindrical part forming the cylinder body is secured to a lever mounted on said ramp to actuate a second valve.
  • variable distribution device associated in the figures with a single cylinder, is used to actuate intake valves of an internal combustion engine of the multicylinder type.
  • the device is more particularly used, in the present example of a multi-valve engine, for actuating a single intake valve per cylinder according to several distinct lifting laws.
  • a first inlet valve is therefore controlled from two control cams, also not shown.
  • a first cam is used to operate the opening of the valve at low load and the second to operate the opening at high load.
  • the first cam the profile of which fits into the profile of the second, cooperates with a first movement transmission member or rocking lever 1 which makes it possible to actuate the valve, while the second cam cooperates with a second lever 2, selectively can be coupled with the first to obtain greater valve lift.
  • These two levers are mounted side by side on the same ramp 14, the first 1 being immobilized axially while the second 2 is mounted to slide freely.
  • the second inlet valve is it controlled by a single control cam, also not shown, by means of a third transmission member or rocking lever 3 cooperating at its end 37 with the valve and by its other end 36 with the cam.
  • the third lever 3 which is positioned on the ramp 4 following the lever 2 on the side opposite to the first lever, is immobilized axially on the ramp.
  • the lever 2 is selectively couplable with the lever 1, by means of conjugated forms 7, 9 such as teeth and dog teeth housings which they carry respectively.
  • conjugated forms 7, 9 such as teeth and dog teeth housings which they carry respectively.
  • the second lever 2 has lateral recesses 10 corresponding to lugs 9 projecting from the side face of the first lever 1 extending opposite the second lever 2.
  • a first assembly permanently requests the second lever 2 in the uncoupling position, it is essentially formed by a return spring 5 extending around the ramp 4 bearing against the first lever 1 on the one hand and the second lever 2 on the other hand.
  • the second set selectively solicits the second lever 2 in the coupling position thanks to a control system activated by the values taken by one or more engine operating parameters, such as the load and / or the speed.
  • This second thrust assembly is formed by a jack selectively supplied with pressurized oil from the ramp 4 in which a duct 14 for supplying the oil is arranged.
  • the jack is formed by a movable part sliding in a body immobilized axially and carried by the ramp 4.
  • the movable part is constituted by the second lever 2 which has for this purpose a bearing surface forming a piston extending on the side opposite to the first lever 1.
  • This bearing surface is formed by a central bore 12 slidingly mounted on a corresponding cylindrical surface 13 carried by the lever 3.
  • the cavity 11 between the lever 2 and the lever 3 forms the hydraulic pressure chamber, this chamber is supplied with pressurized oil from the conduit 14 by means of holes 16 machined on the ramp 4 and opening out in front of the guide surface 13 of the lever 3.
  • a control unit keeps the conduit 14 connected on a low pressure supply circuit or on a return circuit to the oil tank. Chamber 11 is therefore not supplied with oil under high pressure, the spring 5 then exerts a predominant action on the lever 2 keeping the latter uncoupled from the lever 1 ( Figures 1 and 2).
  • the intake valve is then actuated from the first intake cam, the lifting law of which is adapted to such engine operating ranges.
  • the control unit When operating at high speed, for example above 4000 rpm, the control unit then connects the conduit 14 to a high pressure oil circuit.
  • the chamber 11 is therefore supplied with oil under high pressure and the lever 2 is then pushed back against the lever 1 so as to effect the coupling of the conjugate forms 10.9 and thus secure the lever 2 and the lever 1.
  • the lever 2 transmits then to the intake valve via the lever 1, the adapted lifting law determined by the second intake cam.
  • the control unit When the speed decreases, ie returns to the change speed, the control unit removes the high pressure supply and reconnects the conduit 14 to a low pressure supply circuit or to a return circuit to the oil tank.
  • the chamber 11 is therefore no longer supplied with oil under high pressure, the thrust of the spring 5 then provokes the uncoupling of the levers 1 and 2.
  • the intake valve is then actuated again from the first intake cam whose the lifting law is then adapted to the new engine operating ranges.
  • the dimensioning of the different elements of the lever 2 translation control system such as the setting of the spring 5 or the value of the oil supply pressure in the chamber 11 are of course adapted for each type of engine by preliminary tests.
  • variable distribution device all the engine intake and / or exhaust valves can be controlled by the variable distribution device according to the invention.
  • rocking lever 3 carrying the body of the hydraulic cylinder actuating the movable rocker arm 2 can be used to control an exhaust valve.
  • the body of the hydraulic cylinder actuating the movable rocker arm 2 can be produced by a simple cylindrical part fitted on the ramp, this part being or not secured to a rocking lever.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
EP94106967A 1993-05-04 1994-05-04 Variable Ventilsteuereinrichtung für eine Brennkraftmaschine Withdrawn EP0623737A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9305274 1993-05-04
FR9305274A FR2704900B1 (fr) 1993-05-04 1993-05-04 Dispositif de distribution variable pour moteur a combustion interne.

Publications (1)

Publication Number Publication Date
EP0623737A1 true EP0623737A1 (de) 1994-11-09

Family

ID=9446709

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94106967A Withdrawn EP0623737A1 (de) 1993-05-04 1994-05-04 Variable Ventilsteuereinrichtung für eine Brennkraftmaschine

Country Status (2)

Country Link
EP (1) EP0623737A1 (de)
FR (1) FR2704900B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2735178A1 (fr) * 1995-06-09 1996-12-13 Renault Dispositif de distribution variable pour moteur a combustion interne
AT511050A1 (de) * 2011-01-27 2012-08-15 Avl List Gmbh Brennkraftmaschine mit einer variablen ventilbetätigungseinrichtung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2510182A1 (fr) * 1981-07-27 1983-01-28 Renault Dispositif de distribution variable pour moteur a combustion interne
DE3326768A1 (de) * 1982-07-27 1984-02-02 Nissan Motor Co., Ltd., Yokohama, Kanagawa Einrichtung zum aendern des ventilbetriebes eines verbrennungsmotors
JPS61185605A (ja) * 1985-02-12 1986-08-19 Suzuki Motor Co Ltd ４サイクルエンジンのバルブ開閉タイミング可変装置
DE3701609A1 (de) * 1986-01-31 1987-08-06 Volkswagen Ag Ventilbetaetigungseinrichtung
US4690110A (en) * 1985-04-26 1987-09-01 Mazda Motor Corporation Variable valve mechanism for internal combustion engines
DE4124305A1 (de) * 1991-07-23 1993-01-28 Audi Ag Ventiltrieb fuer eine brennkraftmaschine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2510182A1 (fr) * 1981-07-27 1983-01-28 Renault Dispositif de distribution variable pour moteur a combustion interne
DE3326768A1 (de) * 1982-07-27 1984-02-02 Nissan Motor Co., Ltd., Yokohama, Kanagawa Einrichtung zum aendern des ventilbetriebes eines verbrennungsmotors
JPS61185605A (ja) * 1985-02-12 1986-08-19 Suzuki Motor Co Ltd ４サイクルエンジンのバルブ開閉タイミング可変装置
US4690110A (en) * 1985-04-26 1987-09-01 Mazda Motor Corporation Variable valve mechanism for internal combustion engines
DE3701609A1 (de) * 1986-01-31 1987-08-06 Volkswagen Ag Ventilbetaetigungseinrichtung
DE4124305A1 (de) * 1991-07-23 1993-01-28 Audi Ag Ventiltrieb fuer eine brennkraftmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 11, no. 10 (M - 552) 10 January 1987 (1987-01-10) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2735178A1 (fr) * 1995-06-09 1996-12-13 Renault Dispositif de distribution variable pour moteur a combustion interne
AT511050A1 (de) * 2011-01-27 2012-08-15 Avl List Gmbh Brennkraftmaschine mit einer variablen ventilbetätigungseinrichtung

Also Published As

Publication number Publication date
FR2704900A1 (fr) 1994-11-10
FR2704900B1 (fr) 1995-06-16

Similar Documents

Publication Publication Date Title
EP0052554B1 (de) Variable Ventilsteuereinrichtung für eine Brennkraftmaschine
FR2722241A1 (fr) Mecanisme d'actionnement de soupape d'un moteur a combustion interne
FR2512493A1 (fr) Moteur a combustion interne
FR2700580A1 (fr) Système de commande variable pour soupapes dans un moteur à combustion interne.
FR2566837A1 (fr) Dispositif d'actionnement de soupape ayant un role d'arret pour moteur a combustion interne
FR2505926A1 (fr) Appareil de reglage de distribution pour moteur a combustion interne
FR2741667A1 (fr) Mecanisme a soupape d'echappement pour moteur a combustion interne
EP0462853A1 (de) Amplitudenveränderliche Vorrichtung für mindestens einen Brennkraftmaschinensteuerventilhub
EP0040121B1 (de) Vorrichtung zum Abschalten eines Ventilfallhebers
EP0623737A1 (de) Variable Ventilsteuereinrichtung für eine Brennkraftmaschine
FR2796982A1 (fr) Dispositif de commande d'une soupape et moteur a combustion interne muni de ce dispositif
FR2546235A1 (fr) Dispositif de reglage de la quantite de combustible injecte, pour moteur diesel a vilebrequin vertical
FR2484016A1 (fr) Dispositif de distribution variable par modification de levee de soupape pour machines a capsulisme
EP0498682A1 (de) Ventilsteuervorrichtung zum Ausschalten für eine Brennkraftmaschine
FR2796983A1 (fr) Dispositif perfectionne de commande d'une soupape et moteur a combustion interne muni de ce dispostif
FR2674287A1 (fr) Commande hydraulique pour mecanisme de levee a amplitude variable d'au moins une soupape de moteur a combustion interne.
FR2724975A1 (fr) Dispositif pour l'actionnement d'au moins une soupape de moteur a combustion interne
FR2570123A1 (fr) Dispositif de commande variable d'une soupape a tige pour moteur a combustion interne
FR2733539A1 (fr) Dispositif de distribution variable pour moteur a combustion interne
EP0628703A1 (de) Variable Ventilsteuereinrichtung für eine Brennkraftmaschine
FR2508549A3 (fr) Systeme de commande de soupape d'admission de combustible pour un moteur a explosion
FR2689177A1 (fr) Dispositif de distribution variable pour moteur à combustion interne .
EP1197640B1 (de) Ventilsteuerungseinrichtung mit mehreren Konfigurationen
FR2694786A1 (fr) Dispositif de distribution variable pour moteur à combustion interne.
FR2584773A1 (fr) Dispositif de commande variable d'une soupape de moteur a combustion interne

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE ES GB IT

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19950330