EP0185570B1 - Einzelswinghebel zur Betätigung von zwei Ventilen - Google Patents

Einzelswinghebel zur Betätigung von zwei Ventilen Download PDF

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Publication number
EP0185570B1
EP0185570B1 EP19850402230 EP85402230A EP0185570B1 EP 0185570 B1 EP0185570 B1 EP 0185570B1 EP 19850402230 EP19850402230 EP 19850402230 EP 85402230 A EP85402230 A EP 85402230A EP 0185570 B1 EP0185570 B1 EP 0185570B1
Authority
EP
European Patent Office
Prior art keywords
rocker
valves
rods
boss
cam
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
Application number
EP19850402230
Other languages
English (en)
French (fr)
Other versions
EP0185570A1 (de
Inventor
Roger Lombard
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.)
OFFERTA DI LICENZA AL PUBBLICO
Original Assignee
Automobiles Peugeot SA
Automobiles Citroen SA
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 Automobiles Peugeot SA, Automobiles Citroen SA filed Critical Automobiles Peugeot SA
Publication of EP0185570A1 publication Critical patent/EP0185570A1/de
Application granted granted Critical
Publication of EP0185570B1 publication Critical patent/EP0185570B1/de
Expired 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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/181—Centre pivot rocking arms
    • 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
    • F01L1/262—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 valve stems disposed radially from a centre which is substantially the centre of curvature of the upper wall surface of a combustion chamber
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87265—Dividing into parallel flow paths with recombining
    • Y10T137/8741—With common operator
    • Y10T137/87491—Mechanical movement between actuator and non-rotary valve

Definitions

  • the invention relates to devices used in certain internal combustion engines for simultaneously actuating two stem valves by means of a single rocker arm.
  • the rocker arm pivots about an axis roughly orthogonal to the two rods and is supported on the end face of each of them by two bosses located respectively at the end of two juxtaposed arms of the rocker arm. So that the support of each boss on the associated rod takes place properly when the rocker rocker oscillates, said end face being flat and perpendicular to the axis of the rod, the cooperating face of the boss is curved, generally in the form of a spherical cap. .
  • Each valve is pushed towards the corresponding boss by a spring which tends to apply the head of the valve on a seat delimiting an intake or exhaust duct, and the rocker arm oscillates under the action of a rotary cam whose contour , fitted with a circular portion and a lobe, acts on the rocker arm directly or via a sliding plunger.
  • a backlash device is provided between the rocker arm and the cam or in line with the axis of the rocker arm, but then, due to the manufacturing tolerances of the rocker arm, the valves and the parts which support them, unless carry out an expensive matching of parts or an adjustment by shim, the operating clearance is eliminated only for one of the valves; this results, for the other valve, in a loss of lift stroke and an increase in noise and wear.
  • the object of the invention is to produce, by simple and light means, a device suitable for actuating with equal or even zero operating clearances, two stem valves associated with a single rocker arm.
  • the invention therefore relates to an actuating device for two stem valves, comprising a rocker arm which is mounted oscillating on an axis and comprises on one side, an arm cooperating with a cam and, on the other side, two arms terminated by bosses in abutment, respectively, against the end of associated valve stems, characterized in that the rocker arm is slidably mounted on its axis, the transmission between the rocker arm and the cam authorizing this running, and in that at right of each boss one of the two contacting surfaces, of the boss or of the end of the rod, is curved in the shape of a substantially spherical cap, the other surface being planar or cylindrical, the two planar or cylindrical surfaces being inclined and arranged approximately symmetrically with respect to a plane perpendicular to the axis of the rocker arm.
  • rocker arm 1 which is mounted oscillating on an axis 2 carried by two bearings 3, 3a and which cooperates on one side with a cam 4 via a pusher 5 and on the other side with two valves 6, 7 with stem 8, 9.
  • the assembly is carried in the usual way by a cylinder head 10 of an internal combustion engine, the cam 4 being integral with a camshaft 11 parallel to the axis 2, and the pusher 5 sliding in a guide perpendicular to the shaft 11.
  • springs exert respectively on each of the valves a permanent axial thrust tending to place them in their closed position, position which they reach when the pusher 5 cooperates with a circular portion 4a of the cam, while that they move away from their seats by opening the associated conduits 12, 13 when the pusher 5 cooperates with a lobe 4b of the cam.
  • the rocker arm 1 is slidably mounted on the shaft 2 and a substantial space E1, E2 separates it from each bearing 3, 3a in the axial direction. It has on the side opposite to the cam 4 two arms 19, 20 at the end of each of which is formed a boss 21, 22 (FIG. 3) or 23, 24 (FIG. 4) cooperating with the end face 25a, 26a of each. rods ( Figure 4) or with a face 27a, 28a of a tip 27, 28 attached to the end 25, 26 of the corresponding rod ( Figure 3).
  • the end face 25a, 26a of the stems is curved in the shape of a spherical cap or roughly spherical, and the bosses 23, 24 cooperate with them respectively by two plane faces 23a, 24a symmetrically inclined with respect to the abovementioned plane PP.
  • these two faces 23a, 24a can alternatively be formed of cylinder portions having their respective generatrices symmetrical with respect to the plane PP.
  • the pusher 5 comprises a known device, not shown here, for taking up play tending to lengthen it when it is not subjected to a significant axial force, in particular when there appears an operating clearance between the rocker arm and the cooperating parts when the valves rest on their respective seats.
  • the take-up device can, in known manner, be interposed between the axis 2 and the cylinder head 10.
  • the pusher does not have a play take-up device but cooperates with the rocker arm by means of conventional clearance adjustment means.
  • This single adjustment means is sufficient to ensure equal operating clearances for the two valves since if these two games differed, the boss corresponding to the weakest of these games would come before the other boss in contact with the associated rod, causing as indicated above the self-centering of the rocker arm by sliding on its axis until the another boss reaches the cooperating side.
  • This arrangement has less inertia and is less expensive than those which include a means of adjustment to the right of each of the two bosses, and it ensures equality of the two operating clearances even after possible different wear of the cooperating faces since the correction by The rocker arm is always self-centering while the engine is running.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Claims (5)

1. Betätigungsvorrichtung für zwei einen Schaft (8, 9-8a, 9a) aufweisende Ventile (6, 7), mit einem Kipphebel (1), welcher auf einer Achse (2) schwenkbar angebracht ist und einerseits einen mit einem Nocken (4) zusammenwirkenden Arm und andererseits zwei Arme (19, 20) aufweist, die in Höckern (21, 22; 23, 24) enden, welche jeweils gegen das zugehörige Ende (25, 26; 25a, 26a) der Schäfte der Ventile anliegen,
dadurch gekennzeichnet, daß der Kipphebel (1) auf seiner Achse (2) gleitend angebracht ist, wobei die Kraftübertragung zwischen dem Kipphebel und dem Nocken (4) dieses Gleiten zuläßt, und daß senkrecht zu jedem Höcker die eine der in Berührung stehenden Flächen, die des Höckers oder die des Schaftendes, in Form einer im wesentlichen sphärischen Kalotte ballig ist, wobei die andere Fläche plan oder zylindrisch ist, wobei die beiden planen oder zylindrischen Flächen geneigt und ungefähr symmetrisch bezüglich einer zur Achse des Kipphebels senkrechten Ebene (PP) angeordnet sind.
2. Vorrichtung nach Anspruch 1, wobei die Ventilschäfte (8, 9) ungefähr symmetrisch bezüglich einer zur Achse (2) des Kipphebels (1) senkrechten Ebene (PP) geneigt sind,
dadurch gekennzeichnet, daß die mit den Höckern (21, 22) in Berührung stehenden Endflächen (27a, 28a) der Schäfte zu ihren Achsen senkrecht stehen, und die Fläche eines jeden Höckers (21, 22) ungefähr in Form einer sphärischen Kalotte ballig ist.
3. Vorrichtung nach Anspruch 1, wobei die Schäfte (8a, 9a) der Ventile zueinander ungefähr parallel und senkrecht zur Achse (2) des Kipphebels (1) sind,
dadurch gekennzeichnet, daß die Endfläche (25a, 26a) eines jeden Schaftes (8a, 9a) ungefähr in Form einer sphärischen Kalotte ballig ist und die entsprechenden Flächen (23a, 24a) der Höcker (23, 24) plan oder zylindrisch sind.
4. Vorrichtung nach irgendeinem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, daß die Schäfte der Ventile Endansatzstücke (27, 28) tragen.
5. Vorrichtung nach irgendeinem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, daß sie eine einzige Einstell- oder automatische Nachstelleinrichtung für das Arbeitsspiel aufweist, die beispielsweise einem zwischen dem Kipphebel und dem Nocken (4) liegenden Stößel (5) zugeordnet ist.
EP19850402230 1984-11-19 1985-11-18 Einzelswinghebel zur Betätigung von zwei Ventilen Expired EP0185570B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8417615 1984-11-19
FR8417615A FR2573478B1 (fr) 1984-11-19 1984-11-19 Dispositif a un seul culbuteur, pour l'actionnement de deux soupapes

Publications (2)

Publication Number Publication Date
EP0185570A1 EP0185570A1 (de) 1986-06-25
EP0185570B1 true EP0185570B1 (de) 1988-06-08

Family

ID=9309729

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850402230 Expired EP0185570B1 (de) 1984-11-19 1985-11-18 Einzelswinghebel zur Betätigung von zwei Ventilen

Country Status (5)

Country Link
US (1) US4635679A (de)
EP (1) EP0185570B1 (de)
JP (1) JPS61167108A (de)
DE (1) DE3563237D1 (de)
FR (1) FR2573478B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4212263A1 (de) * 1992-04-11 1993-10-14 Bayerische Motoren Werke Ag Schaltvorrichtung für Hubventile einer Brennkraftmaschine
DE102006031031A1 (de) * 2006-07-05 2008-01-10 Schaeffler Kg Hebelartiger Nockenfolger eines Ventiltriebs einer Brennkraftmaschine

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1693832A (en) * 1922-04-18 1928-12-04 Packard Motor Car Co Internal-combustion engine
US2024334A (en) * 1933-03-17 1935-12-17 Gen Motors Corp Valve mechanism for internal combustion engines
US2610617A (en) * 1948-10-12 1952-09-16 Pielstick Gustav Combustion engine valve operating means
US2963010A (en) * 1958-05-30 1960-12-06 Austin Motor Co Ltd Overhead valve internal combustion engines
FR1390661A (fr) * 1964-04-03 1965-02-26 Saurer Ag Adolph Installation pour la commande de deux soupapes travaillant en parallèle
DE1242045B (de) * 1966-08-20 1967-06-08 Daimler Benz Ag Ventilsteuerung fuer eine Kolbenbrennkraftmaschine
AT274477B (de) * 1966-10-12 1969-09-25 H C Hans Dipl Ing Dr Dr List Ventilsteuerung für Brennkraftmaschinen
FR2129059A5 (de) * 1971-03-12 1972-10-27 Chrysler France
US3967601A (en) * 1974-09-07 1976-07-06 Motoren- Und Turbinen-Union Friedrichshafen Gmbh Valve control
US4561391A (en) * 1985-04-04 1985-12-31 Ford Motor Company Four valve for cylinder engine with single overhead camshaft

Also Published As

Publication number Publication date
FR2573478A1 (fr) 1986-05-23
FR2573478B1 (fr) 1987-02-06
US4635679A (en) 1987-01-13
JPS61167108A (ja) 1986-07-28
DE3563237D1 (en) 1988-07-14
EP0185570A1 (de) 1986-06-25

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