EP0395311B1 - Poussoir hydraulique - Google Patents

Poussoir hydraulique Download PDF

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Publication number
EP0395311B1
EP0395311B1 EP90304249A EP90304249A EP0395311B1 EP 0395311 B1 EP0395311 B1 EP 0395311B1 EP 90304249 A EP90304249 A EP 90304249A EP 90304249 A EP90304249 A EP 90304249A EP 0395311 B1 EP0395311 B1 EP 0395311B1
Authority
EP
European Patent Office
Prior art keywords
reservoir
pressure chamber
high pressure
oil
duct
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
EP90304249A
Other languages
German (de)
English (en)
Other versions
EP0395311A1 (fr
Inventor
Flavio Rigamonti
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.)
Eaton Engine Lifters SpA
Original Assignee
Eaton Automotive SpA
Eaton Engine Lifters SpA
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 Eaton Automotive SpA, Eaton Engine Lifters SpA filed Critical Eaton Automotive SpA
Publication of EP0395311A1 publication Critical patent/EP0395311A1/fr
Application granted granted Critical
Publication of EP0395311B1 publication Critical patent/EP0395311B1/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
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/245—Hydraulic tappets
    • F01L1/25—Hydraulic tappets between cam and valve stem

Definitions

  • the present invention refers to a hydraulic tappet for taking up play between a driving cam and the stem of a valve, as soon as possible after a startup, even after a certain period of inactivity of an internal combustion engine.
  • Known hydraulic tappets comprise essentially a first, outer part which engages the driving cam and which has an inner reservoir where the oil collects and an outer reservoir connected to the inner one via an opening; and a second, inner part which slides telescopically inside the first part and contacts the valve stem, such telescopic assembly of the first part inside the second part providing a high pressure chamber of variable capacity which communicates in unidirectional manner with the inner reservoir, eg. via a ball-valve.
  • DE-A-3 418 707 discloses in Fig.1 thereof a duct between a leakdown region and an inner reservoir. Its function is not described, but this duct could not contribute to solving the above problems.
  • DE-A-1 808 000, Fig.1 and description suggests no inner or central reservoir as such, but the normal feed path of the hydraulic fluid is inwards from an outer annular reservoir, across a leakdown path, into an annular feed groove (not an inner reservoir), and thence via an axial duct to a high pressure chamber without anywhere for releasing air bubbles.
  • a diagonal duct is provided between the inner reservoir and the blow-by annulus, which is able to bypass the ball-valve but only when the two telescopic parts of the tappet are telescoped together with the high pressure chamber collapsed, such duct being nearly closed under normal operating conditions with the high pressure chamber not collapsed.
  • a shielding diaphragm positioned at the inlet or on the top of the inner reservoir, which has a small central bore to allow the oil to pass through.
  • Such diaphragm stops all the oil draining from the inner reservoir, when the oil pump is inoperative for some time and the car or the engine has an inclined aspect.
  • Fig. 1 shows a cross-section of the hydraulic tappet of the present invention.
  • a known hydraulic tappet comprises an outer part 10, an inner part 12 and an inner reservoir 16 inserted in the inner part 12. Between such parts 10 and 12 there is defined an outer reservoir 14. Between said inner part 12 and said inner reservoir 16 there is defined a high pressure chamber 18. Lubricating oil originating from the lubricating circuit enters the outer reservoir 14 via an opening 20. From the outer reservoir 14 the oil moves into the inner reservoir 16 via an aperture 36 provided in a diaphragm 38 or by flowing directly into the inner reservoir 16 if diaphragm 38 is not provided. The function of the optional diaphragm 38 will be explained hereinafter. From the inner reservoir 16 the oil flows into the high pressure chamber 18 as a result of a relative movement between the inner part 12 and the inner reservoir 16, i.e. between a wall 40 of the inner part 12 and a wall 42 of the inner reservoir 16, whereby a one-way check valve or ball-valve 44 opens as known in the prior art.
  • a diagonal duct 46 is provided in the thickness of the floor of the inner reservoir 16, such duct 46 normally having one end opening into the oil leakdown region 48 and having the other end opening into the inner reservoir 16.
  • the duct 46 is positioned at an angle alpha of approx 35 degrees in relation to the vertical plane. Any air which is undesirably present in the oil of the high pressure chamber can normally flow through this duct to a non-critical area, making it easier for adequate oil with a minimum of air bubbles to reach and occupy the high pressure chamber 18.
  • the outlet of the diagonal duct 46 ceases to communicate with the annular space provided by the rebate 52, and therefore the oil can flow normally from the inner reservoir 16 to the chamber 18 only via the ball-valve 44, except for a slight leakdown, as is conventional practice, but keeps being partially recirculated from chamber 18 to 16 rather than completely to chamber 14.

Landscapes

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

Claims (3)

  1. Un poussoir télescopique ajustable hydraulique comprenant une partie extérieure (10) en contact avec une came de commande, une partie intérieure (12) en contact avec la tige d'une soupape dans un moteur à combustion interne et disposée à l'intérieur de la partie extérieure (10), les deux parties formant ensemble un réservoir d'huile extérieur (14), un réservoir d'huile intérieur (16) pouvant coulisser dans la partie intérieure (12) et venant normalement en butée, dans le sens exial, contre la partie extérieure (10), le réservoir intérieur (16) et la partie intérieure (12) coulissant l'un dans l'autre formant entre eux, dans le sens axial, une chambre à haute pression (18) de longueur axiale variable qui peut communiquer avec le réservoir intérieur (16) suivant un passage unidirectionnel (44), afin de minimiser le jeu libre dans le sens axial, les parties coulissantes formant entre elles dans le sens radial une région de fuite ou de suintement parallèle de forme annulaire (48) constituant un passage pour le fluide entre la chambre sous pression (18) et le réservoir extérieur (14), et comprenant un conduit (46) qui constitue un passage pour le fluide entre le réservoir intérieur (16) et un point situé dans l'anneau de suintement (48), caractérisé par le fait
       que pour obtenir un rétablissement plus rapide des conditions normales, à partir de l'état d'affaissement de ladite chambre à haute pression (18) et de l'intervalle qui en résulte, entre le réservoir intérieur (16) et la partie extérieure (10), le conduit (46) est disposé de manière à déboucher directement dans la chambre à haute pression (18) lorsque ladite chambre est dans l'état affaissé.
  2. Un poussoir ajustable hydraulique selon la revendication 1 caractérisé par le fait
       qu'à partir d'une entrée adjacente au fond du réservoir intérieur (16) et passant avec une orientation générale en oblique à travers l'épaisseur d'un tel fond, et jusqu'à une position de sortie où il rejoint l'extérieur de la paroi (42) délimitant ledit réservoir, ladite position de sortie étant ainsi sensée correspondre à l'espace annulaire de suintement, il est prévu un conduit (46) incliné d'un certain angle par rapport à ladite paroi de délimitation (42) dudit réservoir intérieur (16), ledit angle d'inclinaison étant de préférence de l'ordre de 35o, le point de sortie dudit conduit (46) se trouvant dans la région de suintement (48) lorsque la chambre à haute pression n'est pas dans l'état affaissé mais débouchant dans un espace annulaire, réalisé au moyen d'un rebord (52) prévu à la surface intérieure d'une paroi intérieure d'une paroi intérieure de la partie intérieure (12) du bouche-trou, seulement lorsque ledit affaissement se produit résultant du fait que le remplissage d'huile de la chambre à haute pression (18) devient insuffisant.
  3. Un poussoir ajustable hydraulique selon la revendication 1 ou 2, caractérisé par le fait
       qu'un diaphragme (38) pourvu d'un orifice (36) est disposé pratiquement dans une position correspondant au sommet du réservoir intérieur (16) déterminant une tendance à la réduction de la vitesse des pertes de fluide à partir de ce réservoir et favorisant ainsi un rétablissement plus rapide de la chambre à haute pression (18) à partir d'un état affaissé.
EP90304249A 1989-04-20 1990-04-20 Poussoir hydraulique Expired - Lifetime EP0395311B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8920213A IT1230011B (it) 1989-04-20 1989-04-20 Punteria idraulica a compensazione migliorata del gioco dopo un periodo di inattivita' del motore.
IT2021389 1989-04-20

Publications (2)

Publication Number Publication Date
EP0395311A1 EP0395311A1 (fr) 1990-10-31
EP0395311B1 true EP0395311B1 (fr) 1993-06-16

Family

ID=11164809

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90304249A Expired - Lifetime EP0395311B1 (fr) 1989-04-20 1990-04-20 Poussoir hydraulique

Country Status (3)

Country Link
EP (1) EP0395311B1 (fr)
DE (1) DE69001950T2 (fr)
IT (1) IT1230011B (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5119774A (en) * 1990-11-08 1992-06-09 General Motors Corporation Direct acting hydraulic valve lifter
DE4339453C2 (de) * 1993-11-19 2001-07-05 Schaeffler Waelzlager Ohg Verfahren zur Montage eines hydraulischen Spielausgleichselementes
DE19503699A1 (de) * 1995-02-04 1996-08-08 Schaeffler Waelzlager Kg Hydraulischer Ventiltriebsstößel
US5709181A (en) * 1997-02-06 1998-01-20 General Motors Corporation Rocker arm assembly
CN110645064A (zh) * 2019-10-31 2020-01-03 东风汽车零部件(集团)有限公司襄阳粉末冶金分公司 一种用于柴油发动机的配气机构的液压挺柱

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1808000A1 (de) * 1968-11-09 1970-05-27 Richard Kuechen Sen Hydraulische,selbsttaetig arbeitende Ventilspielausgleichsvorrichtung
DE3418707A1 (de) * 1984-05-19 1985-10-24 Daimler-Benz Ag, 7000 Stuttgart Hydraulisches spielausgleichselement in einem ventiltrieb fuer brennkraftmaschinen
DE3800945C1 (fr) * 1988-01-15 1989-02-16 Daimler-Benz Ag, 7000 Stuttgart, De

Also Published As

Publication number Publication date
DE69001950T2 (de) 1993-11-11
EP0395311A1 (fr) 1990-10-31
IT8920213A0 (it) 1989-04-20
DE69001950D1 (de) 1993-07-22
IT1230011B (it) 1991-09-20

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