EP0337242B1 - Poussoir de soupape à réglage hydraulique automatique - Google Patents

Poussoir de soupape à réglage hydraulique automatique Download PDF

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Publication number
EP0337242B1
EP0337242B1 EP89105848A EP89105848A EP0337242B1 EP 0337242 B1 EP0337242 B1 EP 0337242B1 EP 89105848 A EP89105848 A EP 89105848A EP 89105848 A EP89105848 A EP 89105848A EP 0337242 B1 EP0337242 B1 EP 0337242B1
Authority
EP
European Patent Office
Prior art keywords
radial flange
tubular member
valve tappet
hollow tubular
bore
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
EP89105848A
Other languages
German (de)
English (en)
Other versions
EP0337242A1 (fr
Inventor
Georg E.H. Dr. Ing. Dipl.-Kfm. Schaeffler
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.)
INA Waelzlager Schaeffler OHG
Original Assignee
INA Waelzlager Schaeffler OHG
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 INA Waelzlager Schaeffler OHG filed Critical INA Waelzlager Schaeffler OHG
Publication of EP0337242A1 publication Critical patent/EP0337242A1/fr
Application granted granted Critical
Publication of EP0337242B1 publication Critical patent/EP0337242B1/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 invention relates to an automatically hydraulically adjusting valve tappet according to the preamble of claim 1.
  • the tubular hollow part is firmly connected on the one hand to the inner surface of the base and, on the other hand, it extends into the vicinity of the radial flange, where it has an oil inlet opening at at least one circumferential point.
  • the arrangement of such an additional hollow part ensures that oil is only sucked in from the lower, air-free area of the oil storage space and transported into the actual play compensation element.
  • this additional hollow part was generally butt welded against the inner surface of the floor. It has been shown that slight dynamic floor deflections that occur during operation, when the control cam runs open, place such a strain on the weld seam located between the floor and the hollow part that it often breaks after a certain operating time. Although the plunger does not lose its functionality, the advantages which are achieved by the arrangement of the hollow part are lost (DE-OS 3542192).
  • a valve tappet has also already been proposed, in which it is possible, owing to the special selection of materials for the radial flange, which in particular comprises plastic and aluminum, to dispense entirely with special fastening methods such as welding, soldering, gluing or the like.
  • the radial flange provided with a completely smooth outer surface can be seen in Press in the smooth bore of the hollow cylindrical wall with an oversize.
  • the fact that the radial flange has a higher coefficient of expansion than the hollow cylindrical wall ensures that even with the temperature differences occurring during operation, this interference fit never loosens, but rather becomes firmer.
  • the fact that the radial flange has a higher coefficient of expansion than the hollow cylindrical wall can at the same time be used for a further advantage.
  • the radial flange forms, together with the hollow cylindrical wall, a longitudinal channel at at least one circumferential point, which extends from an oil supply bore to close to the bottom of the cup-shaped housing. This ensures that the oil reservoir cannot run empty when the engine is at a standstill (EP-A-0272423, in accordance with Article 54.3 EPC).
  • the invention has for its object to eliminate the disadvantages described and a permanent and of the floor deflections with simple constructive and hardly additional costs to achieve independent sealing of the sleeve against the oil reservoir.
  • the invention solves this problem by the features specified in the characterizing part of claim 1.
  • the tubular hollow part can, for example, have the longitudinal section profile of a tubular bellows.
  • this hollow part can also be expedient to give this hollow part a funnel-shaped longitudinal sectional profile in such a way that it rests with its one axial end near the outside diameter of the bottom and with its other axial end near the bore of the radial flange. In this way it is avoided with certainty that deflections of the bottom, which have their greatest amplitude in the center of the bottom, act on the tubular hollow part.
  • the tubular hollow part can expediently consist of sheet steel, in particular of spring steel sheet, in order to ensure that the desired pretension is maintained over the entire service life.
  • a centering edge can be provided on the radial flange, which cooperates positively with the associated end of the tubular hollow part and thereby ensures that it always maintains its intended position even in the radial direction.
  • the end of the tubular hollow part which rests on the floor can be provided with an edge section which runs parallel to the floor and thereby not only makes line contact but also surface contact for secure liquid-tight sealing.
  • valve tappet has a cup-shaped housing 1, which consists of the hollow cylindrical wall 2, which is closed by the bottom 3 at the upper end. At a distance from the floor 3, the radial flange 4 is provided in the bore of the hollow cylindrical wall 2, which receives the actual hydraulic play compensation element 6 in a longitudinally displaceable manner in a bore 5 concentric with the hollow cylindrical wall 2.
  • cup-shaped housing 1 is made of steel
  • the radial flange 4 is made of a polymeric material.
  • the radial flange 4 is fixed in the bore of the hollow cylindrical wall 2 in such a way that the radial flange 4 has a circumferential groove 7 on its outer surface, into which a projection 8 engages.
  • the radial flange 4 has an axial extension 9 which, together with the hollow cylindrical wall 2, delimits a longitudinal channel 10 which starts from an oil supply bore 11 and opens into the oil reservoir 12 near the bottom 3.
  • a tubular hollow part 13 is provided, which is arranged under axial prestress between these two parts.
  • the tubular hollow part 13 has the longitudinal section profile of a tubular bellows. Only one fold is provided in this example.
  • the radial flange 4 has a centering edge 14 which cooperates with the lower end 15 of the tubular hollow part 13 in a form-fitting manner.
  • an oil passage opening 16 in the form of a groove-shaped recess is provided in at least one peripheral point in the radial flange 4.
  • the tubular hollow part has an edge section 17 which runs parallel to the floor 3 and thereby makes surface contact with the floor 3.
  • valve tappet shown in FIG. 2 differs from that according to FIG. 1 only in that the tubular hollow part has a funnel-shaped longitudinal section profile. This ensures that this hollow part rests with its one axial end near the outer diameter on the floor. As a result, deflections of the base 3 practically have no effect on the tubular hollow part 13 during operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Multiple-Way Valves (AREA)
  • Sliding Valves (AREA)

Claims (6)

1. Poussoir de soupape à autoréglage hydraulique agencé dans un alésage de guidage d'une tête de cylindre d'un moteur à combustion interne et constitué par un boîtier en forme de cuvette (1) qui comprend une paroi cylindrique creuse (2) fermée à l'une de ses extrémités par un fond (3) à l'extérieur duquel s'appuie une came de commande, l'élément hydraulique de compensation de jeu (6) proprement dit étant guidé en déplacement longitudinal dans un alésage (5) d'une bride radiale (4) disposée à distance du fond (3), l'alésage (5) étant concentrique à la paroi cylindrique creuse (2) et la bride radiale (4) étant conçue sous forme d'un composant séparé qui, par sa surface périphérique extérieure, est inséré et fixé d'une manière étanche aux liquides dans l'alésage de la paroi cylindrique creuse (2), tandis qu'entre le fond (3) d'un côté et la bride radiale (4) de l'autre côté, est agencé un élément tubulaire creux (13) qui s'appuie par l'une de ses extrémités axiales contre le fond (3), au moins un orifice de transfert d'huile (16) étant prévu entre l'autre extrémité (15) de l'élément tubulaire creux (13) et la bride radiale (4), caractérisé en ce que la bride radiale (4) est réalisée en un matériau qui possède un coefficient de dilatation qui est plus élevé que celui de l'acier, et qui est en particulier similaire à celui de l'aluminium, et en ce que l'élément creux s'appuie par son autre extrémité axiale (15) contre la bride radiale (4) et est agencé avec une précontrainte axiale entre le fond (3) et la bride radiale (4).
2. Poussoir de soupape selon la revendication 1, caractérisé en ce que l'élément tubulaire creux (13) a le profil de coupe longitudinale d'un soufflet tubulaire pliant.
3. Poussoir de soupape selon la revendication 1, caractérisé en ce que l'élément tubulaire creux (13) a un profil de coupe longitudinale en forme d'entonnoir et s'appuie par l'une de ses extrémités axiales au voisinage du diamètre extérieur du fond (3).
4. Poussoir de soupape selon la revendication 1, 2 ou 3, caractérisé en ce que l'élément tubulaire creux (13) est réalisé en tôle d'acier, en particulier en tôle d'acier à ressorts.
5. Poussoir de soupape selon une des revendications précédentes, caractérisé en ce que sur la bride radiale (4) est prévu un bord de centrage (14) qui coopère avec l'autre extrémité (15) de l'élément tubulaire creux (13) par concordance de forme.
6. Poussoir de soupape selon une des revendications précédentes, caractérisé en ce qu'à son extrémité qui s'appuie contre le fond (3), l'élément tubulaire creux (13) comprend une région de bord (17) qui s'étend parallèlement au fond (3).
EP89105848A 1988-04-14 1989-04-04 Poussoir de soupape à réglage hydraulique automatique Expired - Lifetime EP0337242B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3812333A DE3812333A1 (de) 1988-04-14 1988-04-14 Sich selbsttaetig hydraulisch einstellender ventilstoessel
DE3812333 1988-04-14

Publications (2)

Publication Number Publication Date
EP0337242A1 EP0337242A1 (fr) 1989-10-18
EP0337242B1 true EP0337242B1 (fr) 1992-01-22

Family

ID=6351914

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89105848A Expired - Lifetime EP0337242B1 (fr) 1988-04-14 1989-04-04 Poussoir de soupape à réglage hydraulique automatique

Country Status (7)

Country Link
US (1) US4867114A (fr)
EP (1) EP0337242B1 (fr)
JP (1) JPH01301907A (fr)
BR (1) BR8901793A (fr)
DE (2) DE3812333A1 (fr)
ES (1) ES2028400T3 (fr)
RU (1) RU1771515C (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1229355B (it) * 1989-05-23 1991-08-08 Eaton Automotive Spa Punteria idraulica con circolazione dell'olio lungo un percorso sviluppantesi per 360[ su due livelli.
JP2782087B2 (ja) * 1989-06-02 1998-07-30 日鍛バルブ株式会社 直動型油圧ラッシュアジャスタ
JP2782088B2 (ja) * 1989-06-02 1998-07-30 日鍛バルブ株式会社 直動型油圧ラッシュアジャスタ
DE4030987A1 (de) * 1990-10-01 1992-04-02 Schaeffler Waelzlager Kg Sich selbsttaetig hydraulisch einstellender ventilstoessel
US5119774A (en) * 1990-11-08 1992-06-09 General Motors Corporation Direct acting hydraulic valve lifter
US5230308A (en) * 1990-11-08 1993-07-27 General Motors Corporation Low mass direct acting hydraulic valve lifter
US5245958A (en) * 1990-11-08 1993-09-21 General Motors Corporation Direct acting hydraulic valve lifter
DE4115668A1 (de) * 1991-05-14 1992-11-19 Bayerische Motoren Werke Ag Ventilbetaetigungs-stoessel mit einem hydraulischen spiel-ausgleichselement
DE4427943A1 (de) * 1994-08-06 1996-02-08 Schaeffler Waelzlager Kg Hydraulisches Spielausgleichselement für die Ventilsteuerung von Brennkraftmaschinen
DE19602012A1 (de) * 1996-01-20 1997-07-24 Schaeffler Waelzlager Kg Durch einen Nocken einer Brennkraftmaschine betätigter Ventilstößel

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4470381A (en) * 1979-12-05 1984-09-11 Eaton Corporation Hydraulic tappet for direct-acting valve gear
US4373477A (en) * 1980-12-29 1983-02-15 Eaton Corporation Lash adjuster with plunger retainer
US4397271A (en) * 1981-03-02 1983-08-09 Stanadyne, Inc. Semi-self-contained hydraulic lash adjuster
IT8467294A0 (it) * 1984-03-27 1984-03-27 Riv Officine Di Villar Perosa Punteria idraulica per il comando del moto di una valvola di un motore endotermico
DE3513161A1 (de) * 1985-04-12 1986-10-16 Goetze Ag, 5093 Burscheid Ventilspielausgleichseinrichtung
US4624225A (en) * 1985-05-03 1986-11-25 Stanadyne, Inc. Self-contained lash adjuster with diaphragm-type seal
DE3623638C2 (de) * 1986-07-12 1994-02-24 Schaeffler Waelzlager Kg Sich selbsttätig hydraulisch einstellender Ventilstößel
DE3628619A1 (de) * 1986-08-22 1988-03-03 Schaeffler Waelzlager Kg Sich selbsttaetig hydraulisch einstellender ventilstoessel
DE3639911A1 (de) * 1986-11-22 1988-06-01 Schaeffler Waelzlager Kg Sich selbsttaetig hydraulisch einstellender ventilstoessel
DE8808771U1 (fr) * 1988-07-08 1989-11-02 Josef Bohle Stiftung & Co Kg, 5657 Haan, De

Also Published As

Publication number Publication date
US4867114A (en) 1989-09-19
JPH01301907A (ja) 1989-12-06
ES2028400T3 (es) 1992-07-01
DE3812333A1 (de) 1989-10-26
BR8901793A (pt) 1989-11-28
RU1771515C (ru) 1992-10-23
JPH0561442B2 (fr) 1993-09-06
DE58900743D1 (de) 1992-03-05
EP0337242A1 (fr) 1989-10-18

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