EP0111768A1 - Un dispositif mécanique pour règler une soupape d'un moteur à combustion interne - Google Patents

Un dispositif mécanique pour règler une soupape d'un moteur à combustion interne Download PDF

Info

Publication number
EP0111768A1
EP0111768A1 EP83111599A EP83111599A EP0111768A1 EP 0111768 A1 EP0111768 A1 EP 0111768A1 EP 83111599 A EP83111599 A EP 83111599A EP 83111599 A EP83111599 A EP 83111599A EP 0111768 A1 EP0111768 A1 EP 0111768A1
Authority
EP
European Patent Office
Prior art keywords
cam
oscillating
cam follower
valve
fact
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Withdrawn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
EP83111599A
Other languages
German (de)
English (en)
Inventor
Andrea Titolo
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.)
Fiat Auto SpA
Original Assignee
Fiat Auto 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 Fiat Auto SpA filed Critical Fiat Auto SpA
Publication of EP0111768A1 publication Critical patent/EP0111768A1/fr
Withdrawn legal-status Critical Current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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • 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
    • 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

Definitions

  • the present invention relates to a mechanical device for controlling a valve of a heat engine, of the type operable to allow variation in the rise and phase of the valve.
  • Numerous mechanical devices for controlling the valves of heat engines are known, which devices are able to allow the rise and phase of the valves to be varied.
  • These generally include a rocker cooperating with the stem of the valve and driven by an oscillating cam. This latter is controlled by means of a crank and link mechanism the radius of the crank of which is variable.
  • an eccentric rod is used, pivoted to the oscillating cam and operated by the rotation of a shaft. By varying the radius of the crank the desired variation in- the rise and phase of the valves is obtained.
  • the described devices have the disadvantage of giving a law of movement for opening of the valve different from that for closure thereof in that the foot of the link which controls the oscillating cam does not perform a rectilinear path but a circular one. Consequently the speeds and accelerations of the valves on opening and closing are different.
  • the object of the present invention is that of providing a mechanical control device for a valve of a heat engine which will be free from the previously described disadvantages, and which will at the same time allow the rise and phase of the valve to be varied with a simple operation.
  • the said object is achieved by the present invention in that it relates to a mechanical device for the control of a valve of a heat engine, of the type operable to allow the variation in the rise and phase of the said valve, comprising an oscillating rocker pivoted at an intermediate point and operable to cooperate at a first end with the stem of the said valve which: is movable along its axis against the action of resilient means, and at a second end, opposite the first, with a working surface of an oscillating cam of predetermined shape, and means for actuating the said oscillating cam, characterised by the fact that the said actuating means includes a cam follower connected in an articulated manner to the said oscillating cam and movable in a rectilinear manner within a seat, and a rotating cam of predetermined profile cooperating with the said cam follower for transmitting an oscillating movement through this latter to the said oscillating cam.
  • the reference numeral 1 generally indicates a heat engine including cylinders 2 (of which only one is illustrated) and a cylinder head 3 provided with valves 4 (of which only one is visible) at each of the cylinders 2.
  • Each valve 4 is provided with a stem 5 having a cap 6 and is movable along its own axis against the action of a spring 7 cooperating with the cap 6. This latter is fixed to the stem 5 at a head 8 thereof able to cooperate with a first end 9 of an oscillating rocker 10 pivoted at an intermediate point to a shaft 11 about which it is free to turn, and provided with a second end 12 opposite the end 10 cooperable with a working surface 13 of an oscillating cam 14 of predetermined shape.
  • the cam 14 is eccentrically pivoted at 15 in a universal manner on a ball headed end 16 of a plunger 18 and is pivoted eccentrically at 19 to an end 20 of a push rod 21 connected in a universal manner at one end 22, opposite the end 20, to an element 23 of a cam follower 24,slidably housed in a seat 25 and cooperating with a rotary cam 26 of predetermined shape, belonging for example to a cam shaft 28 rotating in the direction of the arrow.
  • the cam follower 24 is movable in rectilinear manner within the seat 25 with respect to the axis of rotation of the cam 26 and its length can vary during operation of the engine 1 between two end-of-stroke positions one of which is illustrated in the drawing.
  • the cam follower 24 receives a reciprocating movement in consequence on the rotation of the cam 26, which it transmits to the shaft 21; consequently this makes the cam 14 oscillate about the fulcrum 16 eccentrically with respect to the shape of the working surface 13.
  • the shape of this latter is such that it interacts with the end 12, with a predetermined relationship, consequently causing the rocker 10 to turn about the pin 11 in the direction of the arrows in an oscillating or reciprocating manner, thereby causing the end 9 to cooperate with the head 8 to move the stem 5 and therefore open and close the valve 4.
  • the spring 7 maintains contact between the various elements of the valve actuating device avoiding separations from occurring during the course of the half of the oscillating movement during the return movement of the cam follower 24 towards the axis of rotation of the cam 26 (closure movement of the valve 4).
  • the end 22 can be moved closer to (or further away from) the axis of rotation of the cam 26, thereby causing a variation in the law of oscillatory movement transmitted to the cam 14 and consequently the rise and phase of the valve 4 can be varied at will within a range of predetermined values.
  • the desired variation in the length of the cam follower 24 is obtained by utilising a cam follower including the -said element 23 and an outer cup-shape element 29 slidably housed in the seat 2 5 , cooperating with the cam 26 and carrying the element 23.
  • This is also of cup-shape form and is lodged within the element 29 in which it is slidable between two end-of-stroke positions in a first of which, illustrated in the drawing, the element 23 is located against a bottom wall 30 of the element 29, with the cam follower 24 thereby being of minimum length, and in a second of which, not illustrated, the element 23 is displaced against a stop ring 31 rigidly connected to the element 29, thereby obtaining the maximum length of the cam follower 24.
  • the element 23 can be translated with respect to the element 29, between the said two positions, to a plurality of intermediate positions as well, both in a discrete manner and in a continuous manner, consequently obtaining a plurality of different lengths of the cam follower 24 and therefore different rise and phasing laws of the valve 4.
  • the cam follower 24 includes control means operable manually or automatically to move together with the cam follower 24 in the seat 25.
  • the cam follower 24 is hydraulic and the elements 23 and 29 delimit a substantially sealed pressure chamber 32 communicating, through radial holes 33 and 34 formed respectively in grooves 35 of both the.elements 23 and 29, with a -lubrication circuit of the engine 1, generally indicated 36.
  • the element 23 is provided with an active surface 37 facing into the chamber 32 and operable to sense the pressure therein to receive a thrust operable to translate the element 23 alangthe element 29 thereby spacing the end 22 from the axis of the cam 26.
  • a control device 38 connected to the lubrication circuit and operable to intervene automatically in consequence on the variation of one or more operating parameters of the engine 1.
  • the device 38 is operable to make the element 23 translate along the element 29 during the movement of this latter in such a way as to vary continuously the length of the cam follower 24 in response to the variation of one or more operating parameters of the engine 1, for example speed of rotation, induction pressure, etc., detected by suitable sensors not illustrated.
  • sensors send signals to the device 38 which includes, for example, a microprocessor capable of calculating the most suitable rise and phase to give to the valve, in dependence on the signals from the sensors, and consequently to modulate the pressure in the chamber 23 capable of obtaining a length of the cam follower 24 such as to produce a phase and rise of the valve 4 equal to that calculated.
  • the profile of the surface 13 of the oscillating cam 14 is chosen in such a way that during a-portion of each half oscillation of the cam 14 the surface 13 slides on the end 12 without interfering with it, that is to say the oscillating movement of the rocker 10 follows a smaller arc than that followed by the cam 14 in performing its oscillatory movement.
  • the specific pressure between the rotating cam 26 and the cam follower 24 is reduced in that this latter starts and ends its rectilinear movement in the seat 2 5 respectively before and after the commencement and termination of the movement of the stem 5 of the valve 4 along its axis.
  • the cam 26 controls the reciprocating movement of the cam follower 24 by means of an opening flank 39 operable to control the translation of the cam follower 24 in a direction such as to open the valve 4, and by means of a closure flank 40 operable to control the translation of the cam follower 24 in the opposite sense, in such a way as to close the valve 4.
  • the flanks 39 and 40 have different profiles such as to actuate the valve 4 to open and close with the same law of motion.
  • the compensation of valve play which cannot be effected on the cam follower 24 without also altering the phase of the valve, is obtained by means of a second hydraulic cam follower 41 rigidly carrying the plunger 18..
  • the cam follower 41 includes a piston 42 which is axially movable and fluid-tightly sealed in a seat 43 and carries the plunger 18; the seat 43 and the piston 42 delimit a pressure chamber 44 permanently connected to the lubrication circuit 36 of the engine 1. From what has been described the advantages of the present invention will be apparent. It allows a valve control mechanism to be obtained which is simple and which has precise and rapid operation and is capable of varying the phase and rise of the valves of the engine in question and to control the valves with the same speeds and accelerations both upon opening and upon closure, or else with any other desired law.
  • the device is moreover simple to automate and in particular is hydraulically operable with means substantially already known and therefore of low cost and high reliability.
  • the rod 21 can be omitted and the cam follower 24 can be directly pivoted to the cam 14. Further, the elongation of the cam follower 24 can be obtained with any other means, for example with mechanical and/or electro mechanical or electrical systems.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
EP83111599A 1982-12-23 1983-11-20 Un dispositif mécanique pour règler une soupape d'un moteur à combustion interne Withdrawn EP0111768A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT6850682 1982-12-23
IT68506/82A IT1157983B (it) 1982-12-23 1982-12-23 Dispositivo cinematico per il comando di una valvola di un motore endotermico

Publications (1)

Publication Number Publication Date
EP0111768A1 true EP0111768A1 (fr) 1984-06-27

Family

ID=11309632

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83111599A Withdrawn EP0111768A1 (fr) 1982-12-23 1983-11-20 Un dispositif mécanique pour règler une soupape d'un moteur à combustion interne

Country Status (4)

Country Link
EP (1) EP0111768A1 (fr)
BR (1) BR8306947A (fr)
ES (1) ES528341A0 (fr)
IT (1) IT1157983B (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2572129A1 (fr) * 1984-10-20 1986-04-25 Mtu Friedrichshafen Gmbh Dispositif de commande des soupapes d'un moteur a combustion interne a quatre temps suralimente
WO1986003694A1 (fr) * 1984-12-18 1986-07-03 Union Carbide Corporation Catalyseurs d'hydrocraquage et procede utilisant des tamis moleculaires de silicoaluminophosphate
WO1987007323A1 (fr) * 1986-05-21 1987-12-03 Bennett Automotive Technology Pty. Ltd. Moteurs destines a etre utilises avec des carburants gazeux
FR2602295A1 (fr) * 1986-07-29 1988-02-05 Weber Srl Dispositif suiveur de came
DE4242634A1 (en) * 1992-12-17 1993-07-22 Uwe Dipl Ing Kirchner Combustion engine valve control mechanism - has gear and worm drive between engine crankshaft and cam shafts, gear drive having conical wheels and worm drive slidable along own axis
DE19509604A1 (de) * 1995-03-16 1996-09-19 Bayerische Motoren Werke Ag Ventiltrieb einer Brennkraftmaschine
GB2322412A (en) * 1997-02-21 1998-08-26 T & N Technology Ltd Variable timing valve operating mechanism
GB2323630A (en) * 1997-03-26 1998-09-30 T & N Technology Ltd Variable timing valve operating mechanism, eg for i.c. engines
WO2004088099A1 (fr) * 2003-03-29 2004-10-14 Boesl Flierl Gerlinde Systeme de commande de levee de soupape variable conçu pour un moteur a combustion pourvu d'un arbre a cames inferieur
WO2004088094A3 (fr) * 2003-03-29 2005-03-03 Hydraulik Ring Gmbh Dispositif de poussoir a soupape variable utilise pour ajuster les soupapes d'echange de gaz dans un moteur a combustion interne
WO2006092312A1 (fr) * 2005-03-03 2006-09-08 Hydraulik-Ring Gmbh Commande mecanique variable de soupapes d'un moteur a combustion interne
DE102005012081A1 (de) * 2005-03-03 2006-11-23 Entec Consulting Gmbh Variable mechanische Ventilsteuerung einer Brennkraftmaschine
KR101481328B1 (ko) 2013-11-01 2015-01-12 현대중공업 주식회사 밸브트레인용 태핏유닛

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2111734A (en) * 1936-01-17 1938-03-22 Riley Percy Hydraulic abutment
US2647500A (en) * 1950-10-28 1953-08-04 Lang Heinrich Valve gear for diesel engines
FR1171218A (fr) * 1957-04-13 1959-01-23 Distribution à mouvement rapide et pleine ouverture prolongée pour passage de liquides ou fluides et plus particulièrement des gaz d'un moteur thermique
US2880711A (en) * 1958-02-05 1959-04-07 Henry A Roan Variable valve timing mechanism for engines
US2997991A (en) * 1960-02-08 1961-08-29 Henry A Roan Variable valve timing mechanism for internal combustion engines
FR2357731A1 (fr) * 1976-07-08 1978-02-03 Chrysler France Procede de commande d'ouverture des soupapes d'un moteur a combustion interne et dispositif pour la mise en oeuvre de ce procede
GB2053350A (en) * 1979-06-14 1981-02-04 Nissan Motor Ic engine valve gear

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2111734A (en) * 1936-01-17 1938-03-22 Riley Percy Hydraulic abutment
US2647500A (en) * 1950-10-28 1953-08-04 Lang Heinrich Valve gear for diesel engines
FR1171218A (fr) * 1957-04-13 1959-01-23 Distribution à mouvement rapide et pleine ouverture prolongée pour passage de liquides ou fluides et plus particulièrement des gaz d'un moteur thermique
US2880711A (en) * 1958-02-05 1959-04-07 Henry A Roan Variable valve timing mechanism for engines
US2997991A (en) * 1960-02-08 1961-08-29 Henry A Roan Variable valve timing mechanism for internal combustion engines
FR2357731A1 (fr) * 1976-07-08 1978-02-03 Chrysler France Procede de commande d'ouverture des soupapes d'un moteur a combustion interne et dispositif pour la mise en oeuvre de ce procede
GB2053350A (en) * 1979-06-14 1981-02-04 Nissan Motor Ic engine valve gear

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2572129A1 (fr) * 1984-10-20 1986-04-25 Mtu Friedrichshafen Gmbh Dispositif de commande des soupapes d'un moteur a combustion interne a quatre temps suralimente
WO1986003694A1 (fr) * 1984-12-18 1986-07-03 Union Carbide Corporation Catalyseurs d'hydrocraquage et procede utilisant des tamis moleculaires de silicoaluminophosphate
WO1987007323A1 (fr) * 1986-05-21 1987-12-03 Bennett Automotive Technology Pty. Ltd. Moteurs destines a etre utilises avec des carburants gazeux
FR2602295A1 (fr) * 1986-07-29 1988-02-05 Weber Srl Dispositif suiveur de came
GB2194610A (en) * 1986-07-29 1988-03-09 Weber Srl A cam follower device
GB2194610B (en) * 1986-07-29 1990-07-25 Weber Srl A cam follower device
DE4242634A1 (en) * 1992-12-17 1993-07-22 Uwe Dipl Ing Kirchner Combustion engine valve control mechanism - has gear and worm drive between engine crankshaft and cam shafts, gear drive having conical wheels and worm drive slidable along own axis
DE4242634C2 (de) * 1992-12-17 1998-02-05 Uwe Dipl Ing Kirchner Einrichtung zur stufenlosen Variierung von Ventilhub und Steuerzeiten der Einlaß- und der Auslaßventile einer Hubkolbenbrennkraftmaschine
DE19509604A1 (de) * 1995-03-16 1996-09-19 Bayerische Motoren Werke Ag Ventiltrieb einer Brennkraftmaschine
GB2322412A (en) * 1997-02-21 1998-08-26 T & N Technology Ltd Variable timing valve operating mechanism
GB2323630A (en) * 1997-03-26 1998-09-30 T & N Technology Ltd Variable timing valve operating mechanism, eg for i.c. engines
GB2323630B (en) * 1997-03-26 2000-09-06 T & N Technology Ltd Operating mechanisms for valves
WO2004088099A1 (fr) * 2003-03-29 2004-10-14 Boesl Flierl Gerlinde Systeme de commande de levee de soupape variable conçu pour un moteur a combustion pourvu d'un arbre a cames inferieur
WO2004088094A3 (fr) * 2003-03-29 2005-03-03 Hydraulik Ring Gmbh Dispositif de poussoir a soupape variable utilise pour ajuster les soupapes d'echange de gaz dans un moteur a combustion interne
JP2006521496A (ja) * 2003-03-29 2006-09-21 ゲルリンデ・ベースル−フリエアル アンダーニースカムシャフトを持つ燃焼エンジン用可変バルブリフト制御システム
US7712442B2 (en) 2003-03-29 2010-05-11 Entec Consulting Gmbh Variable valve lift control system for a combustion engine with underneath camshaft
US7895981B2 (en) 2003-03-29 2011-03-01 Entec Consulting Gmbh Variable valve lift device for the lift adjustment of gas-exchange valves of an internal combustion engine
JP4733630B2 (ja) * 2003-03-29 2011-07-27 エンテク・コンサルティング・ゲーエムベーハー アンダーニースカムシャフトを持つ燃焼エンジン用可変バルブリフト制御システム
WO2006092312A1 (fr) * 2005-03-03 2006-09-08 Hydraulik-Ring Gmbh Commande mecanique variable de soupapes d'un moteur a combustion interne
DE102005012081A1 (de) * 2005-03-03 2006-11-23 Entec Consulting Gmbh Variable mechanische Ventilsteuerung einer Brennkraftmaschine
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
DE102005012081B4 (de) 2005-03-03 2021-09-16 Kolbenschmidt Pierburg Innovations Gmbh Variable mechanische Ventilsteuerung einer Brennkraftmaschine
KR101481328B1 (ko) 2013-11-01 2015-01-12 현대중공업 주식회사 밸브트레인용 태핏유닛

Also Published As

Publication number Publication date
BR8306947A (pt) 1984-07-31
ES8501839A1 (es) 1984-12-01
IT1157983B (it) 1987-02-18
IT8268506A0 (it) 1982-12-23
ES528341A0 (es) 1984-12-01

Similar Documents

Publication Publication Date Title
EP0111768A1 (fr) Un dispositif mécanique pour règler une soupape d'un moteur à combustion interne
US4308839A (en) Fuel injection pump for internal combustion engines
US4794893A (en) Engine valve driving apparatus
JPH0762441B2 (ja) 内燃機関においてクランク軸に対するカム軸の相対角度を調整する装置
SE7713630L (sv) Kompressor med varierbart slag
EP0062040B1 (fr) Appareil a came avec des moyens de came rotatifs a profil variable
EP2999867B1 (fr) Bielle, coussinet de tête de biellette et agencement destiné à modifier la longueur effective d'une bielle pour un moteur à piston à combustion interne
WO2003021082A8 (fr) Moteur alternatif a combustion interne ameliore
US5404770A (en) Variable cam arrangement for a lift valve
EP0406026B1 (fr) Dispositif de variation du calage et de la levée d'une soupape
US7789050B2 (en) Device and method for varying a compression ratio of an internal combustion engine
GB2068495A (en) I.C. engine valve lift hydraulic adjusting device
US4846050A (en) Synchronized control of gearbox by an electronic calculator
US4494514A (en) Hydraulic adjusting device for controlling the beginning of injection of an injection pump
EP0434331A1 (fr) Dispositif d'entraînement de soupapes pour moteur à combustion interne
GB2099101A (en) Apparatus for controlling a gas valve of an engine
US3112739A (en) Valve tappets of internal combustion engines
US1975369A (en) Engine for operating presses
GB1433146A (en) Control mechanism for a variable discharge pump
EP1266130A1 (fr) Mecanisme de commande de soupape
SU493374A1 (ru) Система управлени гидравлическим прессом
RU2178088C1 (ru) Механизм изменения фаз газораспределения четырехтактного двигателя внутреннего сгорания
SU1180603A1 (ru) Устройство дл преобразовани вращательного движени в возвратно-поступательное с регулируемым ходом
SU942970A1 (ru) Механизм осцилл ции станка
US2586117A (en) Actuating element for reciprocable machine elements

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

Designated state(s): BE DE FR GB NL SE

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: 19841210

RIN1 Information on inventor provided before grant (corrected)

Inventor name: TITOLO, ANDREA