FR2472078A1 - Four stroke engine valve drive - has roller controlling valve timing reciprocated between concave surface and shaped cam face - Google Patents

Four stroke engine valve drive - has roller controlling valve timing reciprocated between concave surface and shaped cam face Download PDF

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Publication number
FR2472078A1
FR2472078A1 FR7931380A FR7931380A FR2472078A1 FR 2472078 A1 FR2472078 A1 FR 2472078A1 FR 7931380 A FR7931380 A FR 7931380A FR 7931380 A FR7931380 A FR 7931380A FR 2472078 A1 FR2472078 A1 FR 2472078A1
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France
Prior art keywords
roller
cam
concave surface
cam face
movement
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Granted
Application number
FR7931380A
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French (fr)
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FR2472078B1 (en
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Publication of FR2472078B1 publication Critical patent/FR2472078B1/fr
Granted 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
    • F01L31/00—Valve drive, valve adjustment during operation, or other valve control, not provided for in groups F01L15/00 - F01L29/00
    • F01L31/08—Valve drive or valve adjustment, apart from tripping aspects; Positively-driven gear
    • F01L31/14—Valve adjustment by links or guide rods, e.g. in valve-gears with eccentric drive
    • 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
    • F01L1/044—Reciprocating cams
    • 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
    • F01L1/10—Valve drive by means of crank-or eccentric-driven rods
    • 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
    • F01L13/0021—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 by modification of rocker arm ratio
    • 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
    • F01L13/0063—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 by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • 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
    • F01L13/08—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio
    • 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
    • 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
    • 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
    • F02B2075/028—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle five

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

The modified valve opening drive for a four stroke engine has a roller (4) controlling the valve opening and closing stem connected by a connecting rod (1) to the crankshaft (2). The roller travels along a concave surface (3) underneath a cam (5). This is nominally fixed, but can be rotated to control the lifting and lowering action. This cam has a curved cam face with a variable shape. An alternative design has a sliding cam with a similarly curved cam face.

Description

La présente invention concerne la distribution des moteurs à quatre temps, ou pour plus de gener31ité, la commande des soupapes. The present invention relates to the distribution of four-stroke engines, or for more gener31ité, the valve control.

Dans les moteurs actuels, le compromis adopté pour la loi d'ouverture des soupapes, constitue un handicap majeur pour la recherche de faibles consommations spécifiques concomitantes à des puissances effectives enlevées sur toute la plage d'utilisation, et pour la lutte contre les nuisances, principalement les émissions polluantes. In current engines, the compromise adopted for the valve opening law constitutes a major handicap for the search for low specific consumption concomitant with effective powers removed over the entire range of use, and for the fight against nuisances, mainly polluting emissions.

D'autre part, le fonctionnement du moteur à allumage commandé aux char ges partielles, s'opère actuellement au moyen d'une perte de charge réalisée par les papillons ou la guillotine d'admission. On the other hand, the operation of the spark ignition engine with partial loads is currently carried out by means of a pressure drop produced by the butterflies or the intake guillotine.

I1 en r"sulte un fonctionnement en pompe a vide pendant l'admission r- dulie, très dispendieux en carburant, en raison du prelèvement direct d'une fraction de la puissance utile au vilebrequin. This results in a vacuum pump operation during the reduced intake, very expensive in fuel, due to the direct taking of a fraction of the useful power from the crankshaft.

Le dispositif selon l'invention permet d'éviter ces inconvénients. I1 permet de faire varier la loi d'ouverture des soupapes d'admission et d'éch & - piment, independamment les unes des autres. The device according to the invention avoids these drawbacks. It makes it possible to vary the law of opening of the intake and exhaust valves, independently of one another.

L'invention obvie a la nette dégradation du rendement effectif aux char ges p:irtielles du moteur à explosion, en substituant aux papillons, le pilotage du moteur par la distribution. The invention obviates the clear deterioration of the effective efficiency of the main loads of the internal combustion engine, by replacing the butterflies, the control of the engine by the distribution.

n effet, il. est possible d'éliminer le fonctionnement en pompe à vide, pour un temps d'admission bref, qui peut être nettement inférieur au temps d'admisEion théorique. Les gaz admis pendant ce bref temps d'admission subissert ensuite une dtete dans le cylindre, jusqu'au point mort bas. A charge partielle, le moteur fonctionne alors selon un cycle à cinq temps. No effect there. it is possible to eliminate the vacuum pump operation, for a short admission time, which can be significantly less than the theoretical admission time. The gases admitted during this brief admission time then undergo a debris in the cylinder, until the bottom dead center. At partial load, the engine then operates on a five-stroke cycle.

On note qu'aux très faibles charges, il est souhaitable de limiter la levî de la soupape d'admission car l'obtention de très faibles remplissages du cylindre nécessita:lt des ouvertures très brèves des soupapes, impliqueraient des efforts considérables dans les éléments de la distribution. Note that at very low loads, it is desirable to limit the levî of the intake valve because obtaining very small cylinder fillings required: lt very short valve openings, would involve considerable efforts in the elements of the distribution.

Pour obtenir ce résultant, le mécanisme commandant l'ouverture variable de la soupape selon l'invention est fondé sur l'utilisation de tout ou partie du profil de la came statique qui impose la loi du mouvement. Un galet assujetti à circuler avec un mouvement de va-et-vient sur le profil de la came statique, transmet le mouvement au basculeur ou au poussoir actionnant la soupape. La circulation du galet s'effectue sur tout ou-partie du profil utile de la came statique positionnée à cet effet. To obtain this result, the mechanism controlling the variable opening of the valve according to the invention is based on the use of all or part of the profile of the static cam which imposes the law of movement. A roller subject to flow with a back and forth movement on the profile of the static cam, transmits the movement to the rocker or to the valve actuator. The circulation of the roller takes place over all or part of the useful profile of the static cam positioned for this purpose.

Des modes de réalisation de l'invention sont décrits, à titre d'exemples non limitatifs, avec références aux schémas annexées (fig. 1 à 5). Embodiments of the invention are described, by way of nonlimiting examples, with reference to the attached diagrams (FIGS. 1 to 5).

Dans le premier mode de réalisation (fig. 1), le galet (4) est actionné par la bieiAette (1) du vilebrequin (2). La came statique (5) est positionnée par une rotation ; il en résulte que sa partie neutre ainsi que le profil du basculeur en contact avec le galet (4), sont des arcs de cercles concentriques à l'axe de positionnement. La position de la came statique (5) détermine la partie utile à l'ouverture de la soupape (6), de la course du galet (4). I1 est clair qu'à différentes positions de la came statique (5), correspondent différentes levées et durées d'ouverture de la soupape (6). In the first embodiment (fig. 1), the roller (4) is actuated by the bieiAette (1) of the crankshaft (2). The static cam (5) is positioned by rotation; it follows that its neutral part and the profile of the rocker in contact with the roller (4), are arcs of circles concentric with the positioning axis. The position of the static cam (5) determines the useful part at the opening of the valve (6), of the stroke of the roller (4). It is clear that at different positions of the static cam (5), there correspond different lifts and opening times of the valve (6).

Le second mode de réalisation (fig. 2) ne diffère uniquement du premier (fig. 1) que le déplacement en translation de la came statique (5). The second embodiment (fig. 2) differs only from the first (fig. 1) only the displacement in translation of the static cam (5).

La soupape (6) peut être commandée dans ce cas par un linguet (3) ou un poussoir (13). The valve (6) can be controlled in this case by a latch (3) or a pusher (13).

Dans le troisième mode de réalisation (fig. 3), le galet (4) est guidé dans la glissière (8) du culbuteur (7) pivotant autour de l'axe de positionnement de la came statique (5). La liaison entre le culbuteur (7) et le vilebrequin (2) est une glissière (9) qui peut être rectiligne ou curviligne. In the third embodiment (fig. 3), the roller (4) is guided in the slide (8) of the rocker arm (7) pivoting around the positioning axis of the static cam (5). The connection between the rocker arm (7) and the crankshaft (2) is a slide (9) which can be straight or curvilinear.

Dans le quatrième mode de réalisation (fig. 4), un grand choix de mouvement du galet (4) est possible avec l'utilisation d'une came (t2) en rotation. In the fourth embodiment (fig. 4), a large choice of movement of the roller (4) is possible with the use of a rotating cam (t2).

La (fig.5) montre qu'on peut inverser les rôles joués par la came et le galet (4). La came du culbuteur (10) reçoit un mouvement alternatif par la liaison (9) au vilebrequin (2). Le positionnement du galet (4) au moyen du bras (11) terminé par la glissière (8) détermine la levée et la durée d'ouverture de la soupape (6). The (fig.5) shows that we can reverse the roles played by the cam and the roller (4). The rocker cam (10) receives an alternating movement through the connection (9) to the crankshaft (2). The positioning of the roller (4) by means of the arm (11) terminated by the slide (8) determines the lift and the duration of opening of the valve (6).

Claims (4)

REVENDICaTIOD!SREVENDICaTIOD! S 1) Dispositif pour modifier la loi d'ouverture des soupapes, caractérisé par1) Device for modifying the valve opening law, characterized by l'utilisation de tout ou partie du profil d'une came statique positionnée the use of all or part of the profile of a static cam positioned à cet effet, au moyen d'un galet assujetti à un va-et-vient-sur ce profil, for this purpose, by means of a roller subject to a back-and-forth movement on this profile, et transmettant le mouvement au basculeur ou au poussoir actionnant la sou pape . and transmitting the movement to the rocker or to the pusher actuating the pope. 2) Dispositif selon la revendication 1, caractérisé en ce que le mouvement du2) Device according to claim 1, characterized in that the movement of the galet peut être obtenu d'une biellette attelée à un vilebrequin, ou d'un roller can be obtained from a link coupled to a crankshaft, or from a culbuteur guidant à une extrêmité le galet dans une glissière, et, recevant rocker arm guiding the roller at one end in a slide, and receiving le mouvement alternatif d'un vilebrequin, par une liaison à glissière recti the reciprocating movement of a crankshaft, by a straight slide connection ligne ou curviligne, ou encore d'une came en rotation par des moyens appro pries . line or curvilinear, or a cam in rotation by appropriate means. 3) Dispositif selon les revendications 7 et 2, caractérisé en ce que le dépla3) Device according to claims 7 and 2, characterized in that the displa cement de la came peut être une rotation ou une translation suivant la géo cement of the cam can be a rotation or a translation depending on the geo strie des éléments du mécanisme de distribution. streak of elements of the dispensing mechanism. durée d'ouverture de la soupape. valve opening time. mouvement alternatif, le positionnement du galet déterminant la levée et la reciprocating movement, the positioning of the roller determining the lifting and les joués par la came et le galet peuvent être inversés, la came ayant un the sides played by the cam and the roller can be reversed, the cam having a 4).'ispositif selon l'ensemble des revendications caractérisé en ce que les rô 4). 'Ispositif according to all the claims characterized in that the rô
FR7931380A 1979-12-21 1979-12-21 Four stroke engine valve drive - has roller controlling valve timing reciprocated between concave surface and shaped cam face Granted FR2472078A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7931380A FR2472078A1 (en) 1979-12-21 1979-12-21 Four stroke engine valve drive - has roller controlling valve timing reciprocated between concave surface and shaped cam face

Applications Claiming Priority (1)

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FR7931380A FR2472078A1 (en) 1979-12-21 1979-12-21 Four stroke engine valve drive - has roller controlling valve timing reciprocated between concave surface and shaped cam face

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FR2472078A1 true FR2472078A1 (en) 1981-06-26
FR2472078B1 FR2472078B1 (en) 1983-06-24

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983002301A1 (en) * 1981-12-31 1983-07-07 BAGUÉNA, Michel Variable timing for four stroke engine
WO1998003778A1 (en) * 1996-07-20 1998-01-29 Dieter Reitz Valve drive system and cylinder head for an internal combustion engine
DE10006018A1 (en) * 2000-02-11 2001-08-16 Schaeffler Waelzlager Ohg Variable valve drive for load control of externally ignited IC engine pref. fully variable for non-throttle load control and drive is arranged between camshaft cam and at least inlet valve
DE10006016A1 (en) * 2000-02-11 2001-08-16 Schaeffler Waelzlager Ohg Variable valve drive for load control of external ignited IC engine pref. fully variable for non-throttle load control and drive is arranged between camshaft cam and an inlet
DE10006015A1 (en) * 2000-02-11 2001-08-16 Schaeffler Waelzlager Ohg Variable valve drive for load control of separately ignited IC engine pref. fully variable drive for throttle free engine control and drive is arranged between lifting facility
EP1221009A1 (en) * 1999-10-15 2002-07-10 Vee Two PTY LTD. A guide plate for a poppet valve
DE10206465A1 (en) * 2002-02-16 2003-08-28 Mahle Ventiltrieb Gmbh Control unit for a gas exchange valve in a combustion engine with a multi-component drive, has curved part with separate sectional effects
EP1484479A3 (en) * 2003-06-06 2005-08-24 H.P.E. High Performance Engineering S.r.l. Variable-lift timing system for an internal combustion engine
DE102005010182A1 (en) * 2005-03-03 2006-09-21 Entec Consulting Gmbh Variable mechanical valve control for internal combustion engine has intermediate lever, which is connected to valve push rod by means of shaft, such that slide gate roller, is displaced by camshaft in slide gate
US7603973B2 (en) 2005-03-03 2009-10-20 Hydraulik-Ring Gmbh Variable mechanical valve control for an internal combustion engine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE216111C (en) *
FR836367A (en) * 1938-04-08 1939-01-17 Engine with two different powers for the same opening of the intake regulator and the same speed
CH251500A (en) * 1943-06-01 1947-10-31 Hattink Wilhelmus Aloysius Dip Machine with at least one reciprocating piston.
FR1284700A (en) * 1961-01-07 1962-02-16 Variable timing control
FR2032705A5 (en) * 1969-02-13 1970-11-27 Fiat Spa
FR2237058A1 (en) * 1973-07-13 1975-02-07 Daimler Benz Ag

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE216111C (en) *
FR836367A (en) * 1938-04-08 1939-01-17 Engine with two different powers for the same opening of the intake regulator and the same speed
CH251500A (en) * 1943-06-01 1947-10-31 Hattink Wilhelmus Aloysius Dip Machine with at least one reciprocating piston.
FR1284700A (en) * 1961-01-07 1962-02-16 Variable timing control
FR2032705A5 (en) * 1969-02-13 1970-11-27 Fiat Spa
FR2237058A1 (en) * 1973-07-13 1975-02-07 Daimler Benz Ag

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983002301A1 (en) * 1981-12-31 1983-07-07 BAGUÉNA, Michel Variable timing for four stroke engine
WO1998003778A1 (en) * 1996-07-20 1998-01-29 Dieter Reitz Valve drive system and cylinder head for an internal combustion engine
EP1221009A1 (en) * 1999-10-15 2002-07-10 Vee Two PTY LTD. A guide plate for a poppet valve
JP2003512587A (en) * 1999-10-15 2003-04-02 ヴィー トゥー ピーティーワイ リミテッド Guide plate for poppet valve
EP1221009A4 (en) * 1999-10-15 2005-01-12 Vee Two Pty Ltd A guide plate for a poppet valve
DE10006016B4 (en) * 2000-02-11 2009-08-06 Schaeffler Kg Variable valve drive for load control of a spark-ignited internal combustion engine
DE10006018A1 (en) * 2000-02-11 2001-08-16 Schaeffler Waelzlager Ohg Variable valve drive for load control of externally ignited IC engine pref. fully variable for non-throttle load control and drive is arranged between camshaft cam and at least inlet valve
DE10006016A1 (en) * 2000-02-11 2001-08-16 Schaeffler Waelzlager Ohg Variable valve drive for load control of external ignited IC engine pref. fully variable for non-throttle load control and drive is arranged between camshaft cam and an inlet
DE10006015A1 (en) * 2000-02-11 2001-08-16 Schaeffler Waelzlager Ohg Variable valve drive for load control of separately ignited IC engine pref. fully variable drive for throttle free engine control and drive is arranged between lifting facility
US6386162B2 (en) 2000-02-11 2002-05-14 Ina Walzlager Schaeffler Ohg Variable valve drive for load control of a positive ignition internal combustion engine
DE10006018B4 (en) * 2000-02-11 2009-09-17 Schaeffler Kg Variable valve drive for load control of a spark-ignited internal combustion engine
DE10006015B4 (en) * 2000-02-11 2009-09-17 Schaeffler Kg Variable valve drive for load control of a spark-ignited internal combustion engine
DE10206465A1 (en) * 2002-02-16 2003-08-28 Mahle Ventiltrieb Gmbh Control unit for a gas exchange valve in a combustion engine with a multi-component drive, has curved part with separate sectional effects
US7124721B2 (en) 2002-02-16 2006-10-24 Mahle Ventiltrieb Gmbh Control device for a gas exchange valve in an internal combustion engine
EP1484479A3 (en) * 2003-06-06 2005-08-24 H.P.E. High Performance Engineering S.r.l. Variable-lift timing system for an internal combustion engine
DE102005010182A1 (en) * 2005-03-03 2006-09-21 Entec Consulting Gmbh Variable mechanical valve control for internal combustion engine has intermediate lever, which is connected to valve push rod by means of shaft, such that slide gate roller, is displaced by camshaft in slide gate
US7603973B2 (en) 2005-03-03 2009-10-20 Hydraulik-Ring Gmbh Variable mechanical valve control for an internal combustion engine
US7624711B2 (en) 2005-03-03 2009-12-01 Hydraulik-Ring Gmbh Variable mechanical valve control for an internal combustion engine
DE102005010182B4 (en) * 2005-03-03 2016-05-25 Kolbenschmidt Pierburg Innovations Gmbh Variable mechanical valve control of an internal combustion engine

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