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EP0566526B1 - Enveloppe en forme de tasse d'un poussoir hydraulique de soupape pour moteurs à combustion interne avec arbre à cames en tête - Google Patents

Enveloppe en forme de tasse d'un poussoir hydraulique de soupape pour moteurs à combustion interne avec arbre à cames en tête Download PDF

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Publication number
EP0566526B1
EP0566526B1 EP19930810217 EP93810217A EP0566526B1 EP 0566526 B1 EP0566526 B1 EP 0566526B1 EP 19930810217 EP19930810217 EP 19930810217 EP 93810217 A EP93810217 A EP 93810217A EP 0566526 B1 EP0566526 B1 EP 0566526B1
Authority
EP
European Patent Office
Prior art keywords
wall
base
cup
bore
shaped housing
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
EP19930810217
Other languages
German (de)
English (en)
Other versions
EP0566526A1 (fr
Inventor
Erich Herz
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.)
3A Composites International AG
Original Assignee
Alusuisse Lonza Services Ltd
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 Alusuisse Lonza Services Ltd filed Critical Alusuisse Lonza Services Ltd
Publication of EP0566526A1 publication Critical patent/EP0566526A1/fr
Application granted granted Critical
Publication of EP0566526B1 publication Critical patent/EP0566526B1/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 a cup-shaped housing of an automatically hydraulically adjusting valve tappet for internal combustion engines with an overhead camshaft, with a hollow cylindrical wall closed on one side by a floor and a base ring protruding from the floor concentrically to the wall, which forms an annular ring with the wall and an insert part fixed to it in a liquid-tight manner , limited by at least one bore serving as an oil supply channel with the outside of the housing in connection with the oil reservoir.
  • Such a housing is known, for example, from EP-A-0 212 162, where the base ring is designed directly as a guide sleeve for the play compensation element.
  • the ring-shaped oil reservoir is closed off by means of a ring-shaped disk which is fixed on the one hand to the inner wall of the housing in a liquid-tight manner and on the other hand is sealed against the base ring by means of an O-ring.
  • a hole leads from a circumferential groove in the outer wall of the housing directly into the lower part of the oil reservoir.
  • An insert part is also known from DE-C-34 12 176, in which the guide part for the play compensation element merges at one end into a flange part which is fixed in a liquid-sealing manner on the inner wall of the housing.
  • the inner boundary of the annular oil storage space forms the guide part and parts of the play compensation element.
  • a base ring is not provided in this variant. The oil is fed into the oil reservoir through a circumferential groove and a longitudinal groove in the outer wall of the housing through a hole directly in the lower part of the oil reservoir.
  • the housings described above are usually made of steel. This has the disadvantage that the entire ram has a relatively large mass with a correspondingly high susceptibility to wear having.
  • the inventor has set himself the task of creating a housing of the type mentioned at the outset, which is characterized by high rigidity and low weight and the oil supply channel into the oil reservoir can be created in a simple and cost-effective manner in such a way that The amount of air in the oil reservoir can be kept to a minimum in every operating state.
  • the annular oil storage space is divided into chambers by way of reinforcing webs which are arranged radially and protrude from the base between the base ring and the wall, and the bore runs in one of the reinforcing webs, at least the reinforcing web leading the bore extending in the direction from the wall to the base ring Direction has a first area with a wall thickness larger than the diameter of the bore and a second area with a wall thickness smaller than the diameter of the bore, so that the bore ending in the second area opens after its exit from the first area into an opening connecting the adjacent chambers.
  • the arrangement of a base ring with reinforcing webs stiffens the housing, which allows a relatively thin-walled design of the housing.
  • the housing part consisting of the base, wall, base ring and reinforcing webs can be manufactured in one piece by extrusion from a high-strength aluminum alloy, in particular an alloy of the AlZnMgCu type.
  • the different wall thickness of the reinforcing webs makes it possible to vary the position of the oil supply channel over a wide range and to produce chamber connections in a simple manner by means of simple holes that are to be automated.
  • the bore serving for the oil supply is preferably created starting from the wall and running obliquely upwards towards the floor. This ensures that the oil reservoir remains largely filled in every operating state. Bores, which serve the mere connection opening of adjacent chambers, are, for example, in the area of the wall closed with a press-fit ball.
  • connecting webs which contain a bore serving to supply oil to the oil reservoir have to be formed in the thickness which is different according to the invention.
  • the connecting webs can also have a uniform wall thickness that is smaller than the bore diameter.
  • Such bores are preferably carried out horizontally and near the ground. Otherwise, connection openings between adjacent chambers are only required if no compensation is possible via the end faces of the reinforcing webs adjacent to the insert part.
  • the base ring engages over a hollow cylindrical guide part, which is arranged concentrically with this, for a sliding sealingly displaceable play compensation element with formation of an annular gap
  • the guide part being designed as part of the insert part and at one end merging into an annular flange part which, with its outer circumference, adjoins the Wall of the housing is liquid-tight.
  • the flange part can bear in a known manner with the side of its edge facing the floor against a step-shaped shoulder in the wall of the housing and held non-positively between this shoulder and an annular bead formed on the other side of its edge by a circumferential groove formed in the outside of the wall his.
  • This embodiment of a housing - with the exception of the actual play compensation element - consists of two easy-to-manufacture parts which allow simple and inexpensive assembly. After the housing part has been manufactured as an extruded part, the necessary holes are drilled from the outside. The insert, which can be made of steel, plastic or an aluminum alloy, is then inserted and the outer circumferential groove is rolled in in a known manner, as a result of which the annular bead is formed and the insert is pressed with this force-fit against the step-shaped heel. In the event that this press-in should not lead to the desired liquid-tight connection, this can be produced by additional soldering, welding or caulking.
  • the cup base Since the cup base is exposed to heavy wear and tear due to the running-up cams, it can also be provided with a coating made of a wear-resistant and / or slidable material. Likewise, a wear-resistant and / or lubricious coating can be applied to the outer wall of the cup housing, which is guided in a liner in the engine block during operation.
  • a cup-shaped housing 10 of an automatically hydraulically adjusting valve tappet for internal combustion engines with an overhead camshaft has a hollow cylindrical wall 12 which is closed at one end by a bottom 14 which is integral with it.
  • a base ring 16 which is concentric with the wall 12 and integrally formed with the base 14, projects from the inside of the base 14 of the housing 10 and divides the annular space between the base ring 16 and the wall 12 into chambers 20 via radially arranged reinforcing webs 18.
  • the reinforcing webs 18 are also in one piece with the wall 12, bottom 14 and base ring 16. In the embodiment variant of a housing 10 shown, four reinforcing webs 18 are provided, but six or another number of reinforcing webs can also be arranged.
  • An insert 22 is inserted into the housing 10 such that it projects with a hollow cylindrical guide part 24 for a play compensation element (not shown in the drawing) concentrically into the base ring 16 to form an annular gap 26 and with the outer circumference of an annular flange part integrally formed on the guide part 24 28 is fixed in a circumferential groove 30 in the inner surface of the wall 12 of the housing 10.
  • the installation of the insert part 22 in the housing 10 takes place in such a way that the flange part 28, with the side 14 of its edge facing the bottom 14, is supported against a step-shaped shoulder 32 in the inner surface of the wall 12 and, by subsequently rolling in a circumferential groove 34 in the outer surface of the wall 12, an annular bead 36 in the inner surface of the wall Wall 12 is formed, which forms the circumferential groove 30 together with the step-shaped heel 32 and in this encloses the outer circumference of the annular flange part 28 of the insert part 22 in a force-fitting manner.
  • the reinforcing webs 18 are configured with different thicknesses in cross-section in the direction running from the wall 12 of the housing 10 to the base ring 16.
  • the wall thickness of the reinforcing webs 18 is greater in a first region 18a from the wall 12 to approximately the center of the web than in the subsequent region 18b from the center of the web to the base ring 16.
  • a longitudinal groove 38 extends from the circumferential groove 34 in the region of the radial extension of a reinforcing web 18 in the direction of the bottom 14, from which a bore 40 serving as an oil supply channel and extending obliquely upwards in the connecting web 18 extends.
  • the diameter d of the bore 40 is smaller than the wall thickness d a of the first region 18a and greater than the wall thickness d b of the second region 18b of the connecting web 18, so that the bore 40 ending within the second region 18b after it emerges from the first Region 18a opens into an opening 42 connecting the adjacent chambers 20 due to the larger bore diameter d than the wall thickness d b of the second region 18b.
  • the connecting webs 18 without an integrated oil supply channel are provided with a bore 40a which runs horizontally in the vicinity of the base 14 and which opens into an opening 42a connecting the adjacent chambers 20.
  • This bore 40a which only serves the connection opening 42a of adjacent chambers 20, is closed in the region of the wall 12 by means of a press-in ball 44.

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

Claims (9)

  1. Enveloppe en forme de tasse pour un poussoir de soupape à réglage hydraulique automatique pour moteur à combustion interne à arbre à cames en tête, comportant une paroi (12) cylindrique creuse refermée d'un côté par un fond (14), et un anneau de base (16) qui fait saillie depuis le fond (14) concentriquement à la paroi (12), ledit anneau de base délimitant avec la paroi (12) et avec un élément d'insert (22) fixé sur cette dernière de manière étanche aux liquides une cavité de réserve d'huile de forme annulaire, reliée à l'extérieur de l'enveloppe (10) par au moins un perçage (40) servant de conduit d'amenée d'huile, caractérisée en ce que la cavité de réserve d'huile annulaire est subdivisée en chambres (20) au moyen de voiles de renfort (18) agencés radialement et en saillie depuis le fond (14) entre l'anneau de base (16) et la paroi (12), et en ce que le perçage (40) s'étend dans l'un des voiles de renfort (18), dans laquelle au moins celui des voiles de renfort (18) qui mène le perçage (40) présente dans la direction allant depuis la paroi (12) en direction de l'anneau de base (16) une première région (18a) avec une épaisseur de paroi (da) supérieure au diamètre (d) du perçage (40) et une seconde région (18b) avec une épaisseur de paroi (db) inférieure au diamètre (d) du perçage (40), de sorte que le perçage (40) qui se termine dans la seconde région (18b) après sa sortie de la première région (18a) débouche en une ouverture (42) qui relie les chambres voisines (20).
  2. Enveloppe en forme de tasse selon la revendication 1, caractérisée en ce que le perçage (40) servant à l'amenée d'huile s'étend depuis la paroi (12) en oblique vers le haut en direction du fond (14).
  3. Enveloppe en forme de tasse selon l'une ou l'autres des revendications 1 et 2, caractérisée en ce que les perçages (40) qui servent simplement d'ouvertures de liaison (42a) entre chambres voisines (20) sont obturés dans la région de la paroi (12), en particulier avec une bille (44) mise en place à la presse.
  4. Enveloppe en forme de tasse selon la revendication 3, caractérisée en ce que les perçages (40a) sont agencés horizontalement au voisinage du fond (14).
  5. Enveloppe en forme de tasse selon l'une des revendications 1 à 4, caractérisée en ce que l'anneau de base (16) coiffe une partie de guidage (24) cylindrique creuse et agencée concentriquement audit anneau de base, pour un élément de compensation de jeu susceptible de se déplacer en coulissement et de façon étanche, en formant une fente annulaire (26), la partie de guidage (24) étant réalisée en tant que partie de l'élément d'insert (22) et se transformant à une extrémité en une partie de bride (28) de forme circulaire, qui est fixée au moyen de sa périphérie extérieure contre la paroi (12), de manière étanche aux liquides.
  6. Enveloppe en forme de tasse selon la revendication 5, caractérisée en ce que la partie de bride (28) s'appuie par le côté de sa bordure orienté vers le fond (14) contre un talon en gradin (32) dans la paroi (12) de l'enveloppe (10), et en ce que la partie de bride (28) est maintenue en force entre ce talon (32) et un bourrelet annulaire (36) formé de l'autre côté de sa bordure, par une gorge périphérique (34) formée dans le côté extérieur de la paroi (12).
  7. Enveloppe en forme de tasse selon l'une des revendications 1 à 6, caractérisée en ce que le fond (14), la paroi (12), l'anneau de base (16) et les voiles de liaison (18) sont fabriqués d'une seule pièce sous la forme d'une pièce extrudée en un alliage d'aluminium à haute résistance, en particulier un alliage du type AlZnMgCu.
  8. Enveloppe en forme de tasse selon l'une des revendications 1 à 7, caractérisée en ce que l'élément d'insert (22) est fabriqué en acier, en matière plastique ou en un alliage d'aluminium.
  9. Enveloppe en forme de tasse selon l'une des revendications 1 à 8, caractérisée en ce que la surface extérieure du fond (14) et/ou de la paroi (12) de l'enveloppe (10) est pourvue d'un revêtement en un matériau résistant à l'usure et/ou favorisant le glissement.
EP19930810217 1992-04-14 1993-03-25 Enveloppe en forme de tasse d'un poussoir hydraulique de soupape pour moteurs à combustion interne avec arbre à cames en tête Expired - Lifetime EP0566526B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1240/92 1992-04-14
CH124092 1992-04-14

Publications (2)

Publication Number Publication Date
EP0566526A1 EP0566526A1 (fr) 1993-10-20
EP0566526B1 true EP0566526B1 (fr) 1995-06-28

Family

ID=4205758

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930810217 Expired - Lifetime EP0566526B1 (fr) 1992-04-14 1993-03-25 Enveloppe en forme de tasse d'un poussoir hydraulique de soupape pour moteurs à combustion interne avec arbre à cames en tête

Country Status (3)

Country Link
EP (1) EP0566526B1 (fr)
DE (1) DE59300299D1 (fr)
ES (1) ES2074385T3 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3639911A1 (de) * 1986-11-22 1988-06-01 Schaeffler Waelzlager Kg Sich selbsttaetig hydraulisch einstellender ventilstoessel
IT1230012B (it) * 1989-04-20 1991-09-20 Eaton Automotive Spa Punteria idraulica con condotto di aspirazione dell'olio, dal serbatoio esterno al serbatoio interno senza inclusioni di bolle d'aria, realizzato mediante lavorazione meccanica.
DE3920729A1 (de) * 1989-06-24 1991-01-10 Gmb Giesserei & Maschinenbau B Tassenstoesselkoerper fuer ventilstoessel

Also Published As

Publication number Publication date
ES2074385T3 (es) 1995-09-01
DE59300299D1 (de) 1995-08-03
EP0566526A1 (fr) 1993-10-20

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