EP0115996B1 - Nockenantrieb insbesondere für Ventile von Brennkraftmaschinen - Google Patents

Nockenantrieb insbesondere für Ventile von Brennkraftmaschinen Download PDF

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Publication number
EP0115996B1
EP0115996B1 EP84400209A EP84400209A EP0115996B1 EP 0115996 B1 EP0115996 B1 EP 0115996B1 EP 84400209 A EP84400209 A EP 84400209A EP 84400209 A EP84400209 A EP 84400209A EP 0115996 B1 EP0115996 B1 EP 0115996B1
Authority
EP
European Patent Office
Prior art keywords
oil
cam
valve
actuating arrangement
arrangement according
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
EP84400209A
Other languages
English (en)
French (fr)
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EP0115996A1 (de
Inventor
Jean-Pierre Rivere
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.)
Regie Nationale des Usines Renault
Original Assignee
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 Regie Nationale des Usines Renault filed Critical Regie Nationale des Usines Renault
Publication of EP0115996A1 publication Critical patent/EP0115996A1/de
Application granted granted Critical
Publication of EP0115996B1 publication Critical patent/EP0115996B1/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
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • F01M9/10—Lubrication of valve gear or auxiliaries
    • F01M9/106—Oil reservoirs
    • 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
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • 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
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/11—Thermal or acoustic insulation
    • 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
    • F01L2810/00—Arrangements solving specific problems in relation with valve gears
    • F01L2810/02—Lubrication
    • 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
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/20—SOHC [Single overhead camshaft]
    • 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
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/006—Camshaft or pushrod housings

Definitions

  • the present invention relates to a valve control device, in particular in an overhead camshaft engine, of the type comprising a rotary cam and transmission means cooperating with this cam to communicate to a valve, an alternating movement of lifted, against the force exerted by a return spring ensuring the fallout of the valve.
  • the dispensing valves are commonly controlled either directly by a cam via a pusher, or by a rocker, itself controlled by a cam or by a rod.
  • An essential aim of the present invention consists in overcoming the aforementioned drawbacks by a particular arrangement of the valve control members for an internal combustion engine.
  • the object of the invention is a valve control device of the aforementioned type in which, according to a feature of the invention, the sliding surface of the transmission means coming into contact with the cam remains immersed in an oil bath independent lubrication with a high viscosity of 0.2 to 1 Poiseuille.
  • This arrangement allows separate lubrication of the valve control device by bubbling in viscous oil.
  • a double condition of cleanliness and reduction of friction can thus be ensured because the high viscosities favor the formation of an oil film between the cam and the transmission means such as a rocker arm and a pusher.
  • valve control device also makes it possible not to lose a gain in friction by the use of an auxiliary oil pump of high performance.
  • the aforementioned transmission means consist of a rocker arm pivoting in its middle on a rocker shaft and provided around its pivot axis with grooves which open into the independent oil bath.
  • the rocker shaft can thus be permanently lubricated by bubbling.
  • the aforementioned transmission means consist of a pusher immersed in a bath of upper viscous oil. It is a variant for a direct valve attack which allows the above advantages to be preserved.
  • Figure 3 is a partial sectional view of Figure 2 along 3-3.
  • valves 2 In a cylinder head 1 of an internal combustion engine represented in FIG. 1, are essentially associated in a manner known per se, valves 2, housings 3 of spark plugs, a coolant 4, valve guides 5 provided with seals 6, return springs 7, cups 8, screws 9 for adjusting the play, rocker arms 10 mounted on rocker shafts 11, control cams 12.
  • a cylinder head cover 13 provided with cooling fins 14 covers this cylinder head 1 which contains a viscous oil bath 15 for lubrication thermally insulated from this cylinder head by a coating 17.
  • the rocker arms 10 each have a lower part 10, provided with a shoe 10 2 and embedded in the oil bath 15; each of these rockers pivots in its middle on a shaft 11 and has around its pivot axis, a circular groove 10 3 which opens towards the bottom of the bath 15 in a lower channel 10 4 .
  • a variant shown in Figures 2 and 3 relates to an overhead valve control by overhead camshaft with direct valve attacks.
  • the cam nose 12 1 projects oil by centrifugation into the groove 10 3 of the rocker arm 10 via the lower channel 10 4 and thus makes it possible to continuously lubricate the rocker shaft 11. Simultaneously, the oil splashes 16 external to the oil bath 15 are sufficient to lubricate the contact surface between the valve 2 and the clearance adjusting screw 9.
  • the coating 17 consisting either of an insulating material, for example plastic, or by an air knife taken in particular between two walls, makes it possible to maintain a sufficient viscosity of the oil in the hot bath. This thermal insulation limits the flow of heat which comes from the cylinder head 1 and heats the oil in the bath 15.
  • the cooling fins 14 of the cylinder head cover 13 contribute to evacuating the heat flow produced by the friction of the distribution. .
  • a highly viscous oil circulation with the independent upper bath 21 and supplied by the lower oil bath 31 serving as a reservoir, by means of the low pressure pump 32 allows ensuring the continuous lubrication of the sliding surfaces of the pushers 22 coming into contact with the cams 23 by the pads 38.
  • the viscous oil of the bath 31 rises successively through the channel 30, the groove 28 and the hole 27 in the oil ramp formed by the internal bore 25 of the shaft with cams 24. This oil then feeds through holes 26 judiciously drilled in the cams 23, the upper oil bath 21 before the pushers 22 attack by the sides of these cams. The viscous oil may then fall back into the lower bath 31 serving as a reservoir for closing the lubrication circuit of the distribution.
  • the seals 39 mounted on the valve guides 36 limit oil consumption as much as possible and a thermally insulating material can separate the oil baths 21 and 31 from the cylinder head. 20.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)

Claims (7)

1. Ventilantrieb für eine Brennkraftmaschine mit oben liegenden Nockenwellen, mit einem drehbaren Nocken (12, 23) und einer Übertragungsanordnung (10, 22), die mit den Nocken zusammenwirkt um ein Ventil (2,34) abwechselnd eine Hubbewegung zu erteilen gegen die Wirkung einer Rückholfeder (7, 35), die das Absenken des Ventils (2, 34) gewährleistet, dadurch gekennzeichnet, daß die Gleitfläche der Übertragungsanordnung (10, 22), die den Nocken berührt, in ein unabhängiges Schmierölbad (15, 21) eingetaucht bleibt, das eine erhöhte Viskosität von 0,2 bis 1 Poiseuille (200 bis 1 000 Centipoises) aufweist.
2. Ventilantrieb nach Anspruch 1, dadurch gekennzeichnet, daß die Übertragungsanordnung aus einem Kipphebel (10) besteht, der mittig um eine Kipphebelwelle (11) verschwenkbar ist und der um seine Schwenkachse herum Rillen (103, 104) aufweist, die im Ölbad (15) münden um die Kipphebelwelle (11) mittels Zentrifugieren zu schmieren.
3. Ventilantrieb nach Anspruch 1, dadurch gekennzeichnet, daß die Übertragungsanordnung aus einem Stößel (22) besteht, der in ein oberes viskoses Ölbad (21) eintaucht.
4. Ventilantrieb nach Anspruch 3, dadurch gekennzeichnet, daß das obere Bad (21) von einem unteren Ölbad (31) gespeist wird mittels einer Niederdruckölpumpe (32), einer Leitung (30) und einer Nut (28), die in einem Lager (29) für die Nockenwelle (24) vorgesehen sind, einer Öffnung (27), die die Nockenwelle durchsetzt und in einer Innenbohrung (25) mündet, welche eine Ölleitfläche bildet und mit in den Nocken (23) der Welle (24) gebohrte Öffnungen (26).
5. Ventilantrieb nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß ein thermisch isolierendes Material (17) das unabhängige Ölbad (15, 21, 31) vom Zylinderkopf (1, 20) trennt.
6. Ventilantrieb nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die zum Nocken (12, 23) gehörende Nockenwelle (24) sich in Teilsegmentlagern dreht um die Reibung zwischen diesen und dem viskosen Öl zu verringern.
7. Ventilantrieb nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß ein Dichtungsring (6, 39) auf der Führung (5, 36) für das Ventil (2, 34) vorgesehen ist um den Ölverbrauch zu verringern.
EP84400209A 1983-02-03 1984-01-31 Nockenantrieb insbesondere für Ventile von Brennkraftmaschinen Expired EP0115996B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8301676 1983-02-03
FR8301676A FR2540553A1 (fr) 1983-02-03 1983-02-03 Dispositif de commande a came, notamment pour soupapes de moteurs a combustion interne

Publications (2)

Publication Number Publication Date
EP0115996A1 EP0115996A1 (de) 1984-08-15
EP0115996B1 true EP0115996B1 (de) 1986-11-12

Family

ID=9285564

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84400209A Expired EP0115996B1 (de) 1983-02-03 1984-01-31 Nockenantrieb insbesondere für Ventile von Brennkraftmaschinen

Country Status (5)

Country Link
US (1) US4565168A (de)
EP (1) EP0115996B1 (de)
DE (1) DE3461322D1 (de)
ES (1) ES8407551A1 (de)
FR (1) FR2540553A1 (de)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4711203A (en) * 1984-10-29 1987-12-08 Bayerische Motoren Werke Ag Timing case for a cylinder head of internal combustion engines having gas changing valves arranged essentially in parallel to one another
JPS61126007U (de) * 1985-01-29 1986-08-07
US4856466A (en) * 1988-09-28 1989-08-15 Ford Motor Company Lubricant retaining finger-follower rocker arm
IT1232794B (it) * 1989-09-19 1992-03-05 Meccatec Spa Macchina cucitrice di libri a filo refe.
US4991549A (en) * 1989-12-08 1991-02-12 Yamaha Hatsudoki Kabushiki Kaisha Camshaft lubricating system for engine
FR2683262B1 (fr) * 1991-11-06 1995-02-03 Smh Management Services Ag Moteur a combustion interne avec pompe a huile sur l'arbre a cames.
US5778841A (en) * 1997-02-26 1998-07-14 Cummins Engine Company, Inc. Camshaft for internal combustion engines
US6782856B2 (en) 2002-04-09 2004-08-31 Ford Global Technologies, Llc Camshaft accumulator
FR2848276B1 (fr) * 2002-12-05 2005-02-11 Renault Sa Dispositif d'accouplement d'un organe rotatif a un arbre a cames
DE102006043090A1 (de) * 2006-09-14 2008-03-27 Robert Bosch Gmbh Nockenwellentrieb, insbesondere für eine Dieseleinspritzpumpe, mit einer hubbeweglich angetriebenen Laufrolle
US20130301963A1 (en) * 2012-05-11 2013-11-14 GM Global Technology Operations LLC Automotive powertrain component and bearing with micropores, and method thereof
DE102012222752A1 (de) * 2012-12-11 2014-06-12 Mahle International Gmbh Lageranordnung

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1264494A (en) * 1917-03-28 1918-04-30 Theodore Livinus Reepmaker D Orville Lubricating system for internal-combustion engines.
US1403540A (en) * 1918-03-22 1922-01-17 Packard Motor Car Co Hydrocarbon motor
US1469063A (en) * 1920-11-12 1923-09-25 Wills Childe Harold Oil-feeding means
US1469155A (en) * 1922-01-31 1923-09-25 Hedberg Roy Edgar Valve rocker arm
US1617845A (en) * 1922-05-13 1927-02-15 Elbert J Hall Lubricating and cooling system for internal-combustion engines
FR602018A (fr) * 1924-11-17 1926-03-11 Dispositif de graissage pour distributions de moteurs à soupapes en tête
FR621244A (fr) * 1926-09-10 1927-05-07 Lubrification de la commande des soupape des moteurs à combustion commandés par en haut
US1993992A (en) * 1932-11-21 1935-03-12 Ford Motor Co Internal combustion engine
US3045656A (en) * 1959-08-21 1962-07-24 Renault Engine valve operation
US3605706A (en) * 1969-12-12 1971-09-20 Microdot Inc Valve stem oil deflector
US3788295A (en) * 1972-12-11 1974-01-29 Ford Motor Co Valve stem oil seal and lubricator
US3880128A (en) * 1973-05-02 1975-04-29 Ford Motor Co Valve actuation mechanism including valve lash adjustment means
IT1118658B (it) * 1979-05-23 1986-03-03 Fiat Veicoli Ind Testa cilindri per motori ad accensione per compressione del tipo a precamera di combustione
JPS5627015A (en) * 1979-08-10 1981-03-16 Nissan Motor Co Ltd Diesel engine of light-oil lubrication type
DE3126280C1 (de) * 1981-07-03 1983-01-13 Ford-Werke AG, 5000 Köln Nockenwellenlagerung

Also Published As

Publication number Publication date
ES528469A0 (es) 1984-09-16
EP0115996A1 (de) 1984-08-15
FR2540553B1 (de) 1985-05-17
ES8407551A1 (es) 1984-09-16
DE3461322D1 (en) 1987-01-02
FR2540553A1 (fr) 1984-08-10
US4565168A (en) 1986-01-21

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