EP0570963B1 - Variable Ventilsteuervorrichtung für eine Brennkraftmaschine, insbesondere eine Brennkraftmaschine mit mehreren Ventilen je Zylinder - Google Patents

Variable Ventilsteuervorrichtung für eine Brennkraftmaschine, insbesondere eine Brennkraftmaschine mit mehreren Ventilen je Zylinder Download PDF

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Publication number
EP0570963B1
EP0570963B1 EP93108213A EP93108213A EP0570963B1 EP 0570963 B1 EP0570963 B1 EP 0570963B1 EP 93108213 A EP93108213 A EP 93108213A EP 93108213 A EP93108213 A EP 93108213A EP 0570963 B1 EP0570963 B1 EP 0570963B1
Authority
EP
European Patent Office
Prior art keywords
engine
central portion
valves
control system
seat
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.)
Expired - Lifetime
Application number
EP93108213A
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English (en)
French (fr)
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EP0570963A1 (de
Inventor
Paolo Martinelli
Giuseppe Molinari
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
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Filing date
Publication date
Application filed by Ferrari SpA filed Critical Ferrari SpA
Publication of EP0570963A1 publication Critical patent/EP0570963A1/de
Application granted granted Critical
Publication of EP0570963B1 publication Critical patent/EP0570963B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F01L13/0042—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 with cams being 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/247—Arrangement of valve stems in cylinder heads the valve stems being orientated in parallel with the cylinder axis

Definitions

  • the present invention relates to a valve control system for a variable-timing internal combustion engine, particularly for an engine having several valves per cylinder.
  • Valve control systems for internal combustion engines are known e.g. from EP-A-0 263 794 and JP-A-59 103 907, which enable the lift of the valves to be adjusted in dependence on the running condition of the engine (variable timing systems) and/or to control more than one valve with the same cam.
  • the camshaft may have conical cams with linear profiles which vary along the axis of the camshaft; an axial movement of the camshaft, by means of a power-assisted control system, alters the cam-profile in contact with the valve stem, thereby altering the lift pattern of the valve.
  • the object of the present invention is to provide a valve control system for a variable-timing internal combustion engine which is free of the disadvantages described and which, in particular, enables the reciprocating masses involved in the opening and closing movements of the valves to be minimized, enables the number of control members to be reduced relative to the total number of valves to be controlled and enables automatic clearance-compensation systems to be fitted easily.
  • the present invention provides a valve control system for a variable-timing internal combustion engine, particularly for an engine with several valves per cylinder, of the type disclosed in Claim 1.
  • a system is indicated 1 for the control of the valves 2 of a variable-timing internal combustion engine, of which only one head 11 is illustrated for the sake of simplicity.
  • the control system 1 is made up substantially of a camshaft 3 having at least one cam 4 with a profile which varies along the axis of the camshaft 3 itself, and of a control device 5 interposed between the cam 4 and a duty valve 2 of a cylinder 6 of the engine, each of the valves 2 being arranged in a respective valve seat 7 in direct communication with the cylinder 6 and being provided with a return spring 8 packed between the head 11 of the engine and a washer 12 securely fixed to the valve 2 itself by respective clamping cotters 13.
  • the control device 5 includes in turn a cam follower 14 which cooperates with a peripheral surface 15 of the cam 4 and with a support saddle 16 for the cam follower 14.
  • the control device 5 is constituted essentially by a substantially T-shaped rocker 18 which includes a central portion 21 on the upper surface of which is formed the support saddle 16 for the cam follower 14 and on the underside of which is a seat 22, constituted by a hemispherical recess 23 formed at one end 24 of the central portion 21, for fixing to a fulcrum 25 defined by a ball-headed pin 26 engaging the seat 22 and carried by the head 11 of the engine; also at the end 24, the rocker 18 has an axially-projecting rudder element 27 engaged in a cooperating guide element 28 formed on the head 11 of the engine.
  • the rocker 18 includes a pair of side arms 31 which project in opposite directions from an end 32 of the central portion 21 opposite the end 24 and the connection seat 22; each arm 31 bears against an upper end 33 of a stem 34 of a respective homologous valve of the cylinder 6.
  • the support saddle 16 extends along the entire length of the central portion 21 and is defined by a substantially semi-cylindrical recess 35 having an axis of symmetry A parallel to and coincident with a longitudinal axis of the central portion 21 of the rocker 18.
  • the cam follower 14 is defined essentially by a pad 36 having a flat upper surface 37 which cooperates with the conical peripheral surface 15 of the cam 4, while a convex lower surface 38, which is substantially semi-cylindrical, cylindrical, has a profile which matches the recess 35 of the support saddle 16.
  • the ball-headed pin 26 is fixed securely to a hydraulic tappet 41 mounted in a seat 42 in the head 11, and having an axis of symmetry B which is substantially parallel to a corresponding axis of symmetry C of one of the stems 34 of the valves 2.
  • An hydraulically-sealed supply duct 44 is formed in a portion 43 of the head 11 intermediate the guide element 28 for the rudder element 17 and the hydraulic tappet 41 for supplying lubricating oil under pressure both to the guide element 28 and to the hydraulic tappet 41.
  • the hydraulic tappet 41 In use, as the hydraulic tappet 41 is fixed in its seat 42 formed in the head 11, it does not contribute its mass to the overall mass in reciprocating motion, but acts exclusively as a self-adjusting support for the ball-headed pin 26 onto which the rocker 18 for operating the valves 2 is fixed by means of the seat 22.
  • the hydraulic tappet is in fact fixed in a suitable seat in the engine head instead of being fixed securely to a valve stem; this leads to a considerable reduction in the masses in reciprocating motion with the result that the valves accelerate faster making it possible to employ a cam with a highly defined profile, and thereby improve the filling of the cylinder with the air and fuel mixture and, as an end result, the performance of the engine itself.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Claims (5)

  1. Steuersystem (1) für die Ventile (2) eines Verbrennungsmotors mit variabler Steuerung, insbesondere für einen Motor mit mehreren Ventilen (2) je Zylinder (6), der Art, die aufweist: eine Nockenwelle (3) mit mindestens einer Nocke (4) mit einem Profil, das sich längs der Achse der Nockenwelle (3) ändert, und eine Steuervorrichtung (5), die zwischen die Nocke (4) und mindestens ein Arbeitsventil (2) eines Zylinders (6) des Motors eingefügt ist, wobei die Steuervorrichtung (5) ihrerseits einen Schlepphebel (14) aufweist, der mit einer Umfangsfläche (15) der Nocke und einem Stützsattel (16) für den Schlepphebel (14) zusammenwirkt, die Steuervorrichtung (5) einen Mittelabschnitt (21) mit dem Stützsattel (16) für den Schlepphebel (14) auf seiner Oberseite und ein Paar Seitenarme (31) aufweist, die in entgegengesetzte Richtungen von dem Mittelabschnitt (21) vorspringen, jeder der Arme (31) an einem oberen Ende (33) eines Schafts (34) eines jeweiligen gleichliegenden Ventils (2) des Zylinders (6) anliegt, wodurch ein Ende (24) des Mittelabschnitts (21) der Steuervorrichtung (5) ein axial vorspringendes Ruderelement (27) hat, das in ein entsprechendes Führungselement (28) eingreift, das in dem Motorkopf (11) des Motors geformt ist, dadurch gekennzeichnet, daß die Steuervorrichtung (5) einen Kipphebel (18) aufweist, der im wesentlichen T-förmig ist, wobei das Paar Seitenarme (31) in entgegengesetzte Richtungen von einem ersten Ende (32) des Mittelabschnitts (21) vorspringt, der Mittelabschnitt (21) einen Sitz (22) unter sich zum Befestigen an einer Hebelstütze (25) für den Kipphebel (18) hat, der durch einen Kopf (11) des Motors getragen wird, wobei dieser Sitz (22) in einem zweiten Ende (24) des Mittelabschnitts gegenüber dem ersten Ende (32) angeordnet ist, und das Ruderelement (27) an dem zweiten Ende (24) des Mittelabschnitts (21) des Kipphebels (18) entsprechend der Hebelstütze (25) angeordnet ist.
  2. Steuersystem (1) für Ventile (2) nach Anspruch 1, dadurch gekennzeichnet, daß der Befestigungssitz (22) aus einer halbkugelförmigen Aussparung (23) besteht, die in dem zweiten Ende (24) des Mittelabschnitts (21) des Kipphebels (18) geformt ist, wobei die Hebelstütze (25) durch einen Kugelkopf stift (26) gebildet ist, der in den Sitz (22) eingreift.
  3. Steuersystem (1) für Ventile (2) nach Anspruch 2, dadurch gekennzeichnet, daß sich der Stützsattel (16) längs der gesamten Länge des Mittelabschnitts (21) erstreckt und durch eine halbzylindrische Aussparung (35) mit einer Symmetrieachse (A) gebildet ist, die parallel zu der Längsachse des Mittelabschnitts (21) des Kipphebels (18) und deckungsgleich mit ihr ist; wobei der Schlepphebel (14) durch eine Unterlage (36) mit einer flachen Oberseite (37), die mit einer konischen Umfangsfläche (15) der Nocke (4) zusammenwirkt, und eine konvexe Unterseite (38) gebildet ist, die im wesentlichen halbzylindrisch ist und ein Profil hat, das der halbzylindrischen Aussparung (35) des Sattels (16) entspricht.
  4. Steuersystem (1) für Ventile (2) nach einem der Ansprüche 2 und 3, dadurch gekennzeichnet, daß der Kugelkopfstift (26) sicher an einem hydraulischen Stößel (41) befestigt ist, der in einem Sitz (42) in dem Kopf (11) angebracht ist, wobei der Sitz (42) eine Achse (B) hat, die parallel zu einer entsprechenden Symmetrieachse (C) der Schäfte (24) der Ventile (2) ist.
  5. Steuersystem (1) für Ventile (2) nach Anspruch 4, dadurch gekennzeichnet, daß der Motorkopf (11) des Motors einen Zufuhrkanal für unter Druck gesetztes Schmieröl hat, wobei der Kanal (44) in einem Abschnitt (43) zwischen dem Führungselement (28) und dem hydraulischen Stößel (41) geformt und mit den beiden letztgenannten hydraulisch verbunden ist.
EP93108213A 1992-05-22 1993-05-19 Variable Ventilsteuervorrichtung für eine Brennkraftmaschine, insbesondere eine Brennkraftmaschine mit mehreren Ventilen je Zylinder Expired - Lifetime EP0570963B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO920440 1992-05-22
ITTO920440A IT1257540B (it) 1992-05-22 1992-05-22 Sistema di comando di valvole per un motore endotermico a fasatura variabile, in particolare un motore con piu' valvole per cilindro.

Publications (2)

Publication Number Publication Date
EP0570963A1 EP0570963A1 (de) 1993-11-24
EP0570963B1 true EP0570963B1 (de) 1997-03-05

Family

ID=11410481

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Application Number Title Priority Date Filing Date
EP93108213A Expired - Lifetime EP0570963B1 (de) 1992-05-22 1993-05-19 Variable Ventilsteuervorrichtung für eine Brennkraftmaschine, insbesondere eine Brennkraftmaschine mit mehreren Ventilen je Zylinder

Country Status (4)

Country Link
EP (1) EP0570963B1 (de)
DE (1) DE69308373T2 (de)
ES (1) ES2097942T3 (de)
IT (1) IT1257540B (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1270443B (it) * 1993-02-10 1997-05-05 Fiat Auto Spa Comando di distribuzione a geometria variabile per un motore a combustione interna.
DE9405442U1 (de) * 1994-03-31 1995-08-03 Fev Motorentech Gmbh & Co Kg 4-Ventil-Kolbenbrennkraftmaschine
EP0867601B1 (de) * 1997-03-27 2003-01-22 Toyota Jidosha Kabushiki Kaisha Ventilsteuerung für eine Brennkraftmaschine
DE102006047293A1 (de) * 2006-10-06 2008-04-10 Schaeffler Kg Ventiltrieb für eine Brennkraftmaschine mit verschiebbaren Raumnocken
DE102006058093A1 (de) * 2006-12-09 2008-06-12 Schaeffler Kg Ventiltrieb

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2179700B (en) * 1985-08-29 1989-08-09 Nissan Motor Rocker arm arrangement for multi-valve internal combustion engine
IT1195192B (it) * 1986-10-07 1988-10-12 Fiat Auto Spa Comando valvole per motori ad alberi a camme in testa

Also Published As

Publication number Publication date
EP0570963A1 (de) 1993-11-24
DE69308373T2 (de) 1997-06-26
ITTO920440A0 (it) 1992-05-22
IT1257540B (it) 1996-01-30
ES2097942T3 (es) 1997-04-16
DE69308373D1 (de) 1997-04-10
ITTO920440A1 (it) 1993-11-22

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