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EP0331901B1 - Entraînement de soupape pour une soupape à levée - Google Patents

Entraînement de soupape pour une soupape à levée Download PDF

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Publication number
EP0331901B1
EP0331901B1 EP19890101791 EP89101791A EP0331901B1 EP 0331901 B1 EP0331901 B1 EP 0331901B1 EP 19890101791 EP19890101791 EP 19890101791 EP 89101791 A EP89101791 A EP 89101791A EP 0331901 B1 EP0331901 B1 EP 0331901B1
Authority
EP
European Patent Office
Prior art keywords
valve
eccentric
axis
rotation
play
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
EP19890101791
Other languages
German (de)
English (en)
Other versions
EP0331901A2 (fr
EP0331901A3 (en
Inventor
Dieter Voigt
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.)
VOIGT, DIETER
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0331901A2 publication Critical patent/EP0331901A2/fr
Publication of EP0331901A3 publication Critical patent/EP0331901A3/de
Application granted granted Critical
Publication of EP0331901B1 publication Critical patent/EP0331901B1/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
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically

Definitions

  • the invention relates to a valve train according to the preamble of the claim.
  • a purely mechanical valve lash adjuster generates a gear ratio change of the transmission mechanism by the valve actuation, so that a certain play occurs in the transmission mechanism after the valve is closed, which is then eliminated again by the spring-loaded eccentric (eccentric disk).
  • This mechanical valve lash adjuster thus automatically compensates for changes in length due to wear or thermal expansion in the valve train.
  • this mechanical valve lash adjuster offers the advantages of being independent of the oil quality of the oil circuit of the machine equipped with the valve train and minimizing the oscillating valve train masses due to the arrangement of the mechanical balancing parts in the pivot point of the transmission lever.
  • a valve train according to the preamble of the claim is known from US-A-3,087,478.
  • the rocker arm takes the eccentric located in the rocker arm bearing with a bracket, which leads to a partially changed rocker arm pivot point with the resulting play generation after valve closing.
  • the kinetic energy in the moving valve drive system is used in order to bring about an eccentric adjustment in the sense of generating a game after the valve has closed.
  • Another valve drive known from US-A-1 979 348 has a rocker arm slotted on its bearing, in which load-dependent clamping effects partially rotate the eccentric in the valve actuation phase in the sense of generating a game after valve closing.
  • the invention has for its object to provide a valve train according to the preamble of claim so that regardless of the wear and thermal expansion dependent eccentric position and the working frequency in the phase of the valve actuation, a defined, only minimal eccentricity takes place in the sense of a game generation.
  • the achievement of this task is in the characterizing features of the claim.
  • the transmission lever designed as a rocker arm, uses the effects of the forces and moments acting on the eccentric to twist it in the sense of creating a game, its pivoting angle being limited by a bushing with a defined rotational play, which is arranged between the rocker arm and the eccentric frictionally.
  • Figure 1 shows a side view, partially in section, while Figure 2 shows the associated top view.
  • the essential components of the valve train are the cam 1 rotating in the direction of the arrow, which in an internal combustion engine is usually seated on a camshaft driven by the machine itself, and the rocker arm 2, which is arranged on the pivot shaft 3 which is mounted in a stationary and rotationally fixed manner.
  • the axis of the pivot axis 3 is designated as the secondary axis 4.
  • rocker arm 2 with its right end in the figures in this exemplary embodiment rests on the rotating cam 1 for the purpose of reducing friction via the rollers 5 and accordingly takes part in its lifting movement
  • its left end in the figures is a rolling support 6 on the free end of the valve stem 7 set up; only the closing spring 8 of the lift valve is shown since it is a well-known construction.
  • the eccentric 9 is frictionally mounted on the pivot axis 3, which is provided with the recess 10 for receiving the end of the spring 11 acting in the circumferential direction, the other end of which is supported in a fixed manner in the recess 12 of the pivot axis and thus both parts 3 and 9 braced against each other.
  • the eccentric 9 is connected to the rocker arm 2 via the bushing 14 inserted on both sides with the associated main axis 13.
  • the bushing 14 has a recess 15 with the edges 17 and 18 for receiving the radial stop 16 of the pivot axis 3 with play.
  • the eccentricity e of the eccentric 9 extends practically in the direction of the longitudinal axis of the rocker arm 2 in the position shown of the various components of the valve drive Limited play between the recess 15 of the bush 14 and the stop 16 and the moment acting counterclockwise from the spring 11 on the eccentric 9, this results in the following mode of operation of the valve drive shown.
  • the actual cam 1 becomes effective, it swivels the rocker arm 2 in a counterclockwise direction in FIG. Due to the friction, the bushing 14 also takes part in this pivoting movement until the edge 18 contacts the stop 16.
  • the eccentric 9 remains at rest in spite of the frictional torque acting on it from the sleeve 14 and the spring torque also acting on the left, since the force F acting on it when the valve is actuated to the top generates a correspondingly large counterclockwise torque F * e about the lifting axis 4.
  • the rocker arm 2 pivots only about the main axis 13 of the eccentric 9 remaining at rest when the valve is opened.

Landscapes

  • 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 (1)

  1. Commande de soupape pour une soupape montante et descendante,en particulier pour une soupape de charge à deux voies d'un moteur à explosion , avec une came tournante (1) et un levier de transmission basculant sur palier (2) à la façon d'un culbuteur de soupape dont une extremité (5) est préparée pour faire appui sur la came tournante (1) et l'autre extremité (6) étant préparée por faire appui sur l'extremité libre de la tige de soupape (7) .
    La commande de soupape est aussi equipée d'une roue excentrique tournante (9) sur un axe pivot fixe (3) , les deux ayant pour but d'éliminer le jeu provoqué par le ressort en se compressant .
    De cette façon avec la mise en mouvement du levier de transmission (2), un balancement de la roue excentrique dans le but de produire un jeu lorsque la soupape est fermée, sera provoqué .
    Ainsi carractérise du fait qu'entre la roue excentrique (9) et la clavette dans le levier de transmission (2),se trouve un manchon (14) ayant ses deux côtés alésés ainsi qu'une clavette en position radiale .
    Le manchon (14) dont le jeu est limité par un ergot fixe (16) maintient l'axe pivot (3) .
    De plus , l'excentricité (e) de la roue excentrique (9) est définie de telle façon que pedant l'ouverture ou la fermeture de la soupape ,le levier de transmission basculant (2) en fin de friction , prend du manchon (14) et ce dernier de la roue excentrique (9) le jeu nécessaire entre la clavette (15) et l'ergot (16) et ainsi l'axe secondaire (4) fait fonction partiellement d'axe pivot pour le levier de transmission .
EP19890101791 1988-02-05 1989-02-02 Entraînement de soupape pour une soupape à levée Expired - Lifetime EP0331901B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3803442 1988-02-05
DE3803442 1988-02-05

Publications (3)

Publication Number Publication Date
EP0331901A2 EP0331901A2 (fr) 1989-09-13
EP0331901A3 EP0331901A3 (en) 1989-10-18
EP0331901B1 true EP0331901B1 (fr) 1993-11-18

Family

ID=6346693

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890101791 Expired - Lifetime EP0331901B1 (fr) 1988-02-05 1989-02-02 Entraînement de soupape pour une soupape à levée

Country Status (1)

Country Link
EP (1) EP0331901B1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10105807C1 (de) 2001-02-08 2002-05-08 Hatz Motoren Kipphebel für einen Ventiltrieb eines Verbrennungsmotors mit Vorrichtung zur selbsttätigen Ein-/Nachstellung des Ventilspiels
WO2019186887A1 (fr) * 2018-03-29 2019-10-03 本田技研工業株式会社 Ensemble de soupape d'échappement de moteur à combustion interne

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1979348A (en) * 1932-06-18 1934-11-06 Robert C Russell Valve operating mechanism
GB534655A (en) * 1939-08-09 1941-03-13 Thompson Prod Inc Improvements in or relating to valve tappet mechanisms and like vibratory mechanicallinkages
US3087478A (en) * 1961-11-13 1963-04-30 Earl A Thompson Mfg Company Lash adjusting device

Also Published As

Publication number Publication date
EP0331901A2 (fr) 1989-09-13
EP0331901A3 (en) 1989-10-18

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