EP0287554A2 - Entraînement de soupape pour un moteur à combustion interne - Google Patents

Entraînement de soupape pour un moteur à combustion interne Download PDF

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Publication number
EP0287554A2
EP0287554A2 EP88890091A EP88890091A EP0287554A2 EP 0287554 A2 EP0287554 A2 EP 0287554A2 EP 88890091 A EP88890091 A EP 88890091A EP 88890091 A EP88890091 A EP 88890091A EP 0287554 A2 EP0287554 A2 EP 0287554A2
Authority
EP
European Patent Office
Prior art keywords
cylinder head
rocker arm
bearing surface
head upper
drive 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.)
Withdrawn
Application number
EP88890091A
Other languages
German (de)
English (en)
Other versions
EP0287554A3 (fr
Inventor
Gerhard Feichtinger
Othmar Dipl.-Ing. Skatsche
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.)
AVL List GmbH
Original Assignee
AVL List GmbH
AVL Gesellschaft fuer Verbrennungskraftmaschinen und Messtechnik mbH
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 AVL List GmbH, AVL Gesellschaft fuer Verbrennungskraftmaschinen und Messtechnik mbH filed Critical AVL List GmbH
Publication of EP0287554A2 publication Critical patent/EP0287554A2/fr
Publication of EP0287554A3 publication Critical patent/EP0287554A3/fr
Withdrawn legal-status Critical Current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
    • F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
    • 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
    • F01L2001/188—Fulcrums at upper surface

Definitions

  • the invention relates to a valve drive of an internal combustion engine with a camshaft below and at least one rocker arm mounted in the cylinder head, the web of which has a shape with a cylindrical bearing surface which is guided laterally.
  • a valve train of the type mentioned is known for example from DE-OS 24 36 091.
  • a bumper driven by a cam of the camshaft cooperates with its upper end with a rocker arm which is pivotally supported in the cylinder head cover. The other end of the rocker arm is in contact with the valve stem of a poppet valve.
  • the disadvantage of this design is that there is a relatively large friction surface between the cylinder head cover and the rocker arm.
  • a cylinder head cover according to the aforementioned DE-OS is only able to assume management and storage functions to a limited extent due to the large forces occurring in this area.
  • the aim of the invention is to avoid these problems and to propose a drive of the type mentioned at the outset, which is distinguished by a simple construction and in which the endurance can be found with a minimum of rework and individual parts.
  • the bearing surface for the U-shaped rocker arm is designed as a semi-cylindrical saddle and is an integral part of a cylinder head upper part which can be fastened to the cylinder head, and in that the leg of the rocker arm is guided laterally by guide surfaces of the cylinder head upper part.
  • the cylinder head upper part in the region of the valve stem can have a maintenance opening that can be closed with a cover. This makes it possible to adjust the valve using the adjusting screw without removing the upper part of the cylinder head mentioned.
  • the cylinder head upper part together with the saddle can be produced by die casting.
  • the upper part of the cylinder head can be produced in one operation, which also has the advantage that no machining is required.
  • a lubricating oil channel guided in the upper part of the cylinder head ends on the bearing surface of the saddle.
  • the rocker arm can be produced as a stamped sheet metal part or as an investment casting, which means that in both cases no machining of the bearing point is required.
  • the rocker arm 2 which is supported on a push rod 1 and the valve stem 4, has a U-shaped cross section, the web 10 of the rocker arm 2 having a shape 11 serving as a bearing surface.
  • the rocker arm 2 is pivotally supported on the saddle 12 formed in one piece with the cylinder head upper part 3, the bearing surface of which is semi-cylindrical and essentially opposite to the bearing surface of the rocker arm 2 on the shape 11.
  • a maintenance opening 16 is provided in the cylinder head upper part 3, which is covered with the maintenance cover 9. This allows access to the adjusting screw 8.
  • Such a maintenance cover or the maintenance opening can possibly be dispensed with if the valve train is provided with hydraulic valve clearance compensation elements.
  • a lubrication channel 7 opens at the bearing surface of the saddle 12.
  • these lubrication channels are supplied in pairs by a supply channel 17 which is connected to a pressure oil source (not shown) and in the upper part of the cylinder head 3 runs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
EP88890091A 1987-04-13 1988-04-12 Entraínement de soupape pour un moteur à combustion interne Withdrawn EP0287554A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT92787 1987-04-13
AT927/87 1987-04-13

Publications (2)

Publication Number Publication Date
EP0287554A2 true EP0287554A2 (fr) 1988-10-19
EP0287554A3 EP0287554A3 (fr) 1989-03-15

Family

ID=3503050

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88890091A Withdrawn EP0287554A3 (fr) 1987-04-13 1988-04-12 Entraínement de soupape pour un moteur à combustion interne

Country Status (1)

Country Link
EP (1) EP0287554A3 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0872630A2 (fr) 1997-04-18 1998-10-21 Volkswagen Aktiengesellschaft Palier d'un linguet de commande de soupape d'un moteur à combustion interne
DE19743488A1 (de) * 1997-10-01 1999-04-08 Bayerische Motoren Werke Ag Zylinderkopf mit Ventilsteuerung für eine Brennkraftmaschine
EP1186751A1 (fr) * 2000-09-06 2002-03-13 EATON AUTOMOTIVE S.p.A. Dispositif de commande de soupape avec système de lubrification simplifié
DE102011114588A1 (de) * 2011-09-30 2013-04-04 Thyssenkrupp Presta Teccenter Ag Ventiltrieb für Brennkraftmaschinen mit verstellbarer Nockenwelle

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1355441A (en) * 1917-05-25 1920-10-12 Benjamin S Williams Internal-combustion engine
US2572968A (en) * 1947-03-11 1951-10-30 Continental Aviat & Eng Corp Rocker arm construction
GB953022A (en) * 1960-12-15 1964-03-25 Ford Motor Co Valve gear for internal combustion engines
FR1341909A (fr) * 1962-12-20 1963-11-02 Ford Motor Co Perfectionnement aux moteurs à combustion interne
GB1040395A (en) * 1963-07-24 1966-08-24 Thompson Ramo Wooldridge Inc Improvements in or relating to valve rocker arms
FR1420573A (fr) * 1964-10-30 1965-12-10 Simca Automobiles Sa Dispositif de maintien pour culbuteurs montés sur rotules

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0872630A2 (fr) 1997-04-18 1998-10-21 Volkswagen Aktiengesellschaft Palier d'un linguet de commande de soupape d'un moteur à combustion interne
DE19743488A1 (de) * 1997-10-01 1999-04-08 Bayerische Motoren Werke Ag Zylinderkopf mit Ventilsteuerung für eine Brennkraftmaschine
EP1186751A1 (fr) * 2000-09-06 2002-03-13 EATON AUTOMOTIVE S.p.A. Dispositif de commande de soupape avec système de lubrification simplifié
DE102011114588A1 (de) * 2011-09-30 2013-04-04 Thyssenkrupp Presta Teccenter Ag Ventiltrieb für Brennkraftmaschinen mit verstellbarer Nockenwelle

Also Published As

Publication number Publication date
EP0287554A3 (fr) 1989-03-15

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