EP0663515B1 - Dispositif de compensation du jeu des soupapes - Google Patents

Dispositif de compensation du jeu des soupapes Download PDF

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Publication number
EP0663515B1
EP0663515B1 EP94119725A EP94119725A EP0663515B1 EP 0663515 B1 EP0663515 B1 EP 0663515B1 EP 94119725 A EP94119725 A EP 94119725A EP 94119725 A EP94119725 A EP 94119725A EP 0663515 B1 EP0663515 B1 EP 0663515B1
Authority
EP
European Patent Office
Prior art keywords
ball
receptacle
supply channel
rocker arm
valve
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
EP94119725A
Other languages
German (de)
English (en)
Other versions
EP0663515A1 (fr
Inventor
Rüdiger Dipl.-Ing. Hass
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.)
Caterpillar Motoren GmbH and Co KG
Original Assignee
Krupp Mak Maschinenbau GmbH
MaK Motoren GmbH and Co KG
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 Krupp Mak Maschinenbau GmbH, MaK Motoren GmbH and Co KG filed Critical Krupp Mak Maschinenbau GmbH
Publication of EP0663515A1 publication Critical patent/EP0663515A1/fr
Application granted granted Critical
Publication of EP0663515B1 publication Critical patent/EP0663515B1/fr
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
    • 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
    • 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
    • F01L1/14—Tappets; Push rods
    • F01L1/146—Push-rods
    • 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
    • F01L1/14—Tappets; Push rods
    • F01L1/16—Silencing impact; Reducing wear
    • 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
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/01—Absolute values

Definitions

  • the invention relates to a device for valve clearance compensation of intake and exhaust valves of an internal combustion engine for timing adjustment via a rocker arm, a bumper with a bearing element being mounted in a receptacle of the rocker arm between the rocker arm and a rocker arm of a valve train.
  • Eccentrics on a rocker arm axis are known for adjusting the timing of intake and exhaust valves.
  • the valve clearance changes at the same time. Adjustment of the valve may be necessary if the change in valve clearance has not been taken into account by a corresponding run-up curve of the control cam on a camshaft.
  • Such rocker arm geometries with often different bumper lengths for the intake and exhaust valves and small valve clearance changes cannot be accommodated in the engine due to their design.
  • a device for valve clearance compensation in an internal combustion engine in which a bumper has a bearing on a fluid bed both in the rocker arm and in the rocker arm element, which is provided in a semicircular recess in the bumper and in the rocker arm element is.
  • the object of the invention is to provide an automatic valve lash adjuster via a device between a bumper and a rocker arm.
  • valve lash change can be compensated for by a simple construction of the mounting of the bumper in the rocker arm as a hydraulic bearing.
  • the receptacle is connected to a supply channel for hydraulic oil, which is connected to the lubricating oil circuit of the engine.
  • pressure can build up between a bearing element of the bumper and its reception in the rocker arm in accordance with the position of the cam contour relative to the roller on the rocker arm.
  • the bearing element advantageously consists of a ball, with a feed channel for receiving the ball being provided with a check valve as a ball or cone, depending on the type of motor, or the feed channel is only designed as a channel with a relatively small diameter.
  • the bumper in the receptacle on the rocker arm can be provided with a dome-shaped recess.
  • a spherical zone connects to the side of this recess as a supporting area.
  • the valve clearance compensation device is provided between a bumper 1 and a rocker arm 2 of a valve train of an internal combustion engine.
  • the rocker arm 2 is held by a roller 4 on the cam 5 of a camshaft of the engine.
  • the rocker arm 2 can be adjusted toward the cam 5 via an eccentric adjustment device 6.
  • the bumper 1 is supported in a hydraulic receptacle 7 on the rocker arm 2 with one end 8 and with the other end 9 turned away in the rocker arm 10. This acts with its lever end 11 on a valve 12. The simultaneous actuation of two valves is shown.
  • the bumper 1 has at the end 8 a bearing element which is designed as a ball 13, as shown in FIG. 2.
  • the ball 13 is held in a ball socket 15 which has a supply channel 16; 16a for hydraulic oil.
  • This channel is connected to a lubricating oil circuit of the engine and has a check valve 17, which consists of a ball 18 or a cone element.
  • the ball socket 15 is designed with a gap of the same width a, as shown in FIGS. 2 to 4.
  • the ball socket can also be provided with a carrot-shaped depression 20 according to FIG. 4.
  • a support area 21 and 22 for the ball 13 of the bumper 1 extends over an angular range c and d on both sides of the recess 20.
  • the roller 4 When the device is functioning, the roller 4 is located on a base circle G of the cam 5. Lubricating oil can be supplied via the lubricating oil circuit of the engine via the feed channel 16; 16a and the check valve 17 penetrate into the narrow gap 25 between ball socket 15 and ball 13.
  • the bumper 1 is moved against the rocker arm 10 and braced hydraulically.
  • the ball 13 with the diameter d is fitted very closely in the cylindrical diameter d into the cylindrical bore 26 adjoining the ball socket 15, as a result of which stable pressure conditions are achieved.
  • the valve 12 is actuated via the contour of the cam 5.
  • the pressure rises in the gap space 25.
  • the feed channel 16; 16a closed by the ball 18 or the cone (very small stroke design). Due to the short time and the small annular gap cross section in the cylindrical area, very little lubricating oil can escape.
  • the dimension z between the bottom of the ball span 15 and the highest elevation of the ball 13 is reduced slightly in this period.
  • the roller 4 is again on the base circle G.
  • the bumper 1 is relaxed.
  • Lubricating oil can again via the feed channel 16; 16a are replenished. Approximately 2.5 times the valve actuation time is available for the lubricating oil make-up.
  • the check valve 17 can be omitted because of the inertia.
  • the bumper mounting can then be designed according to FIG. 3 with a relatively small diameter feed channel 16.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Claims (7)

  1. Dispositif de compensation du jeu de soupapes pour soupapes d'admission et de sortie d'un moteur à combustion lors des réglages des temps de commande à l'intervention d'un levier oscillant (2), dans le cas duquel, entre le levier oscillant (2) et un levier culbuteur (10) d'une commande de soupape, une biellette est montée par un élément d'appui (13) dans un logement (7) du levier oscillant (2), le dispositif de compensation étant caractérisé en ce que l'élément d'appui (13) est constitué par une rotule sous forme de bille qui prend appui hydrauliquement dans un logement (7) formé par une cuvette de coussinet (15), en ce que la cuvette de coussinet (15) se rattache à un passage cylindrique (26), en ce que la rotule sous forme de bille, d'un diamètre (d) dans le diamètre du cylindre s'ajuste très étroitement dans le passage cylindrique (26) qui fait suite à la cuvette de coussinet (15) et en ce que le logement (7) présente un conduit d'arrivée (16, 16a) qui est relié à un circuit d'huile de graissage du moteur, conduit qui est prévu pour amener l'huile hydraulique dans un intervalle (25) du logement (7).
  2. Dispositif suivant la revendication 1, caractérisé en ce que le conduit d'arrivée (16, 16a) débouche au centre de la cuvette de coussinet (15).
  3. Dispositif suivant l'une ou l'autre des revendications 1 et 2, caractérisé en ce que le conduit d'arrivée (16a) est constitué par un passage de diamètre relativement faible.
  4. Dispositif suivant l'une quelconque des revendications 1 à 3, caractérisé en ce que le conduit d'arrivée (16) est muni d'une soupape de retenue (17) qui comporte une bille (18) placée dans le conduit (16), bille (18) qui ouvre ou ferme ce conduit en fonction de la position du levier oscillant (2) sur une came (5) de l'arbre à came.
  5. Dispositif suivant l'une ou l'autre des revendications 1 à 4, caractérisé en ce que la soupape de retenue (17) montée dans le conduit d'arrivée (16) est constituée par un élément sous forme de cône.
  6. Dispositif suivant l'une quelconque des revendications 1 à 5, caractérisé en ce que la cuvette de coussinet (15) comporte un creux en forme de calotte qui a été prévu pour contenir la rotule d'appui (13) de la biellette (1) au centre du logement, creux que rejoint une zone sphérique (c et d) pour la rotule d'appui (13).
  7. Dispositif suivant l'une quelconque des revendications 1 à 6, caractérisé en ce que le creux en forme de calotte (20) représente un volume d'amortissement et s'étend sur une zone d'angle (b) de 30 degrés de chaque côté d'un plan médian longitudinal (x - x) du logement, zones à chacune desquelles fait suite, de chaque côté, une zone d'angle (c et d) de 60 degrés, qui représente une face portante.
EP94119725A 1994-01-14 1994-12-14 Dispositif de compensation du jeu des soupapes Expired - Lifetime EP0663515B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4400876 1994-01-14
DE4400876A DE4400876A1 (de) 1994-01-14 1994-01-14 Vorrichtung zum Ventilspielausgleich

Publications (2)

Publication Number Publication Date
EP0663515A1 EP0663515A1 (fr) 1995-07-19
EP0663515B1 true EP0663515B1 (fr) 1997-04-23

Family

ID=6507889

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94119725A Expired - Lifetime EP0663515B1 (fr) 1994-01-14 1994-12-14 Dispositif de compensation du jeu des soupapes

Country Status (2)

Country Link
EP (1) EP0663515B1 (fr)
DE (2) DE4400876A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10041466B4 (de) * 2000-08-23 2008-10-09 Man Diesel Se Ventiltrieb für Gaswechselventile einer Brennkraftmaschine
DE10342642A1 (de) * 2003-09-16 2005-05-04 Ina Schaeffler Kg Hydraulischer Nockenfolger
DE102004004179A1 (de) * 2004-01-28 2005-08-25 Man B & W Diesel Ag Ventiltrieb für Gaswechselventile einer Brennkraftmaschine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1090322A (fr) 1953-12-30 1955-03-29 Renault Perfectionnements à la commande de soupapes de moteurs à combustion interne
FR2325803A1 (fr) * 1975-09-26 1977-04-22 Chrysler France Perfectionnements a un systeme de distribution d'un moteur a combustion interne
IT8353149V0 (it) * 1983-04-01 1983-04-01 Riv Officine Di Villar Perosa Punteria idraulica con ripresa automatica di gioco per un motore endotermico in particolare con comando delle valvole mediante bilancieri
US4806040A (en) * 1987-02-12 1989-02-21 Cummins Engine Company, Inc. Ceramic ball and socket joint

Also Published As

Publication number Publication date
EP0663515A1 (fr) 1995-07-19
DE59402517D1 (de) 1997-05-28
DE4400876A1 (de) 1995-07-20

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