EP0468202B1 - Poussoir à galet avec compensateur de jeu hydraulique - Google Patents

Poussoir à galet avec compensateur de jeu hydraulique Download PDF

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Publication number
EP0468202B1
EP0468202B1 EP91110211A EP91110211A EP0468202B1 EP 0468202 B1 EP0468202 B1 EP 0468202B1 EP 91110211 A EP91110211 A EP 91110211A EP 91110211 A EP91110211 A EP 91110211A EP 0468202 B1 EP0468202 B1 EP 0468202B1
Authority
EP
European Patent Office
Prior art keywords
roller
tappet
hydraulic
roller tappet
valves
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
EP91110211A
Other languages
German (de)
English (en)
Other versions
EP0468202A1 (fr
Inventor
Josef Thoma
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0468202A1 publication Critical patent/EP0468202A1/fr
Application granted granted Critical
Publication of EP0468202B1 publication Critical patent/EP0468202B1/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
    • 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
    • F01L1/143—Tappets; Push rods for use with overhead camshafts
    • 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
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • 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
    • F01L2305/00—Valve arrangements comprising rollers
    • 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
    • F01L2307/00—Preventing the rotation of tappets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/18—DOHC [Double overhead camshaft]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/247—Arrangement of valve stems in cylinder heads the valve stems being orientated in parallel with the cylinder axis

Definitions

  • the invention relates to a roller tappet with a hydraulic compensation element, in particular for actuating internal combustion engine gas exchange valves, a roller rolling on a cam, in particular a camshaft.
  • Valve actuating tappets with hydraulic compensating elements are widely used in modern internal combustion engines.
  • roller tappets with hydraulic valve lash compensation elements have also become known. Examples of this are shown in European patent application 318 151 or DE 38 14 700 A1. The roller provided on the tappet and cooperating with the cam reduces the friction work to be performed as part of the valve actuation.
  • the known roller tappets with hydraulic compensating elements have a large volume and in particular have a relatively large overall height. Therefore, the invention has set itself the task of demonstrating measures by means of which the space, but especially the height of a Roller tappet can be reduced with a hydraulic compensating element.
  • roller and the compensation element on the tappet are arranged essentially side by side.
  • a standard hydraulic balancing element which is also installed in the known tappets, can advantageously be used here. This generally has two pistons which can be pushed into one another and which delimit a hydraulic high-pressure chamber, which can be filled from a hydraulic storage chamber via a check valve device.
  • Such a or similarly designed compensating element can be guided in a roller tappet according to the invention in a known manner.
  • the tappet carries the role that cooperates with the cam. This arrangement significantly reduces the height of the roller tappet.
  • the ram is guided within a housing as usual by a correspondingly designed ram outer wall.
  • two rollers can be provided for the moment of force-free introduction of force, which are diametrically opposite each other near the ram outer wall.
  • Such an arrangement is particularly advantageous if a single tappet is provided for actuating two gas exchange valves located next to one another. Then it is advisable to assign a separate hydraulic compensation element to each valve.
  • it is also possible to provide a tappet for actuating two valves with only a single, centrally arranged roller since even then an essentially tipping moment-free introduction of force is ensured, an extremely compact construction also continuing Order results.
  • a plunger for actuating a plurality of gas exchange valves lying next to one another will not have a circular cylindrical shape, in this case there is advantageously no need for an anti-rotation device otherwise required for roller plungers.
  • a gas exchange valve 1 of an internal combustion engine is actuated as usual by a cam 2, which is machined out of a camshaft 3.
  • a roller tappet designated in its entirety with 4 is provided for this purpose. This roller tappet is guided with its housing 5 in a guide bore 6 in the cylinder head 7, not shown, of an internal combustion engine so as to be longitudinally displaceable in the valve actuation direction.
  • roller tappet 4 Essential elements of the roller tappet 4 are the rollers 9 mounted on the tappet housing 5 via rolling elements 8, as well as the hydraulic compensation element, which is also mounted in the tappet housing 5 and is designated in its entirety by 10.
  • This hydraulic compensating element acts directly on the shaft of the gas exchange valve 1, while the roller 9 rolls on the cam 2.
  • the hydraulic compensating element 10 is supplied with hydraulic medium via a supply bore 11 running in the housing 5 of the roller tappet 4, which is in turn connected to the oil circuit of the internal combustion engine - represented by oil channels 12 in the cylinder head 7.
  • the roller tappet 4 has a centrally arranged compensating element 10 and two diametrically opposite rollers 9a, 9b arranged next to the compensating element 10. This arrangement enables an extremely compact design with a torque-free introduction of force by the cams 2 or the gas exchange valve 1, which only requires a small overall height.
  • the roller tappet 4 actuates two gas exchange valves 1a, 1b.
  • Each of these gas exchange valves is assigned a compensation element 10a, 10b mounted in the tappet housing.
  • two rollers 9a, 9b are arranged diametrically opposite one another on the tappet outside. In the case of an internal combustion engine with several gas exchange valves connected in parallel, the construction effort can be reduced even further with this arrangement.
  • the rollers can be supported by pins which are formed in one piece with the housing 5, and securing rings, plastic caps, spring elements or the like can be provided for axially securing the rollers.
  • securing rings, plastic caps, spring elements or the like can be provided for axially securing the rollers.
  • the plunger is guided via the sliding body-like housing 5, which can be connected to the hydraulic compensation element (s) 10, for example by plastic extrusion coating.
  • the housing 5 can also be made of aluminum and can be provided with a coating at the sliding points.
  • the tappet can be prevented from rotating by the geometric design of the sliding surfaces or, in the case of a cylindrical guide, by the bearing journals of the rollers or their securing elements.
  • the channels 11 for supplying oil can be cast or machined into the housing 5.
  • All of the exemplary embodiments are based on the same basic concept, according to which the required installation space is kept small and the resulting overall height is minimized if the hydraulic compensation element and the roller, viewed in the direction of the roller axis, are arranged essentially next to one another on a roller tappet with a hydraulic compensation element.

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

Claims (5)

  1. Poussoir à galets avec un élément hydraulique compensateur de jeu (10, 10a, 10b) en particulier pour actionner des soupapes de passage des gaz de moteurs à combustion interne (1, 1a, 1b), dans lequel un galet (9, 9a, 9b) roule sur une came (2) en particulier une came d'un arbre à cames (3), poussoir à galet caractérisé en ce que les galets (9, 9a, 9b) et l'élément compensateur de jeu (10, 10a, 10b) sont disposés sur le poussoir (4) vu dans le sens axial du galet sensiblement côte à côte.
  2. Poussoir à galets selon la revendication 1, caractérisé en ce que l'on prévoit deux galets (9a, 9b) situés diamétralement l'un en face de l'autre.
  3. Poussoir à galets selon la revendication 1 ou 2, caractérisé en ce que l'on prévoit des éléments compensateurs de jeu (10a, 10b) séparés dans un carter commun de poussoir (5) pour les soupapes de passage des gaz (1a, 1b) situés côte à côte.
  4. Poussoir à galets selon la revendication 3, caractérisé en ce que le galet est disposé au milieu entre les éléments compensateurs de jeu de deux soupapes situées côte à côte.
  5. Poussoir à galets selon l'une des revendications 1 à 4, caractérisé en ce qu'un réservoir d'agent hydraulique (13) est disposé au centre entre les carters partiels (5a, 5b) de poussoir.
EP91110211A 1990-07-27 1991-06-21 Poussoir à galet avec compensateur de jeu hydraulique Expired - Lifetime EP0468202B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4023886 1990-07-27
DE4023886A DE4023886A1 (de) 1990-07-27 1990-07-27 Rollenstoessel mit einem hydraulischen ausgleichselement

Publications (2)

Publication Number Publication Date
EP0468202A1 EP0468202A1 (fr) 1992-01-29
EP0468202B1 true EP0468202B1 (fr) 1993-05-26

Family

ID=6411134

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91110211A Expired - Lifetime EP0468202B1 (fr) 1990-07-27 1991-06-21 Poussoir à galet avec compensateur de jeu hydraulique

Country Status (2)

Country Link
EP (1) EP0468202B1 (fr)
DE (2) DE4023886A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0503145B1 (fr) * 1991-03-13 1994-08-24 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Poussoir de commande d'au moins deux soupapes
DE4211632A1 (de) * 1992-04-07 1993-10-14 Bayerische Motoren Werke Ag Ventilsteuerung für Gaswechselventile einer Brennkraftmaschine
US5361733A (en) * 1993-01-28 1994-11-08 General Motors Corporation Compact valve lifters
DE4337330C2 (de) * 1993-11-02 1996-03-21 Iav Motor Gmbh Rollenstößel mit zwei Rollen je Ventil für Ventiltriebe von Verbrennungsmotoren mit oben liegender Nockenwelle
DE4410123C2 (de) * 1994-03-24 2003-02-20 Ina Schaeffler Kg Ölversorgung bei einer Ventilbetätigungseinrichtung
DE9406190U1 (de) * 1994-04-14 1994-06-09 INA Wälzlager Schaeffler KG, 91074 Herzogenaurach Vorrichtung zur gleichzeitigen Betätigung von zumindest zwei Gaswechselventilen
DE4415270A1 (de) * 1994-04-30 1995-11-02 Opel Adam Ag Einrichtung zur gleichzeitigen Betätigung zweier Gaswechselventile einer Brennkraftmaschine
DE19803246A1 (de) * 1998-01-28 1999-08-05 Meta Motoren Energietech Vorrichtung zum Betätigen wenigstens eines Ladungswechselventils einer Brennkraftmaschine
DE102010027608A1 (de) 2010-07-19 2012-01-19 Schaeffler Technologies Gmbh & Co. Kg Steuertrieb einer Brennkraftmaschine
WO2017028918A1 (fr) 2015-08-19 2017-02-23 Volvo Truck Corporation Mécanisme d'actionnement de soupape variable, moteur à combustion interne et véhicule

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4231267A (en) * 1978-11-01 1980-11-04 General Motors Corporation Roller hydraulic valve lifter
DE3622245A1 (de) * 1986-07-02 1988-01-14 Ford Werke Ag Rollenstoesselanordnung mit verdrehsicherung, insbesondere fuer brennkraftmaschinen
DE3624108A1 (de) * 1986-07-17 1988-01-28 Opel Adam Ag Ventiltrieb fuer zumindest zwei gleichzeitig zu betaetigende ventile
DE3638202A1 (de) * 1986-11-08 1988-05-19 Schaeffler Waelzlager Kg Hydraulisches spielausgleichselement
US4807575A (en) * 1987-11-23 1989-02-28 General Motors Corporation Hydraulic lash adjuster with multi-directional check valve
DE3743854A1 (de) * 1987-12-23 1989-07-06 Michael Stirm Vierventilsteuerung mit oberen abstuetzelementen
DE3814700A1 (de) * 1988-04-30 1989-11-09 Schaeffler Waelzlager Kg Hydraulisches spielausgleichselement

Also Published As

Publication number Publication date
DE4023886A1 (de) 1992-01-30
DE59100131D1 (de) 1993-07-01
EP0468202A1 (fr) 1992-01-29

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