EP0460988A1 - Steuervorrichtung mit Nockenwelle und Kraftübertragungsmittel mit Rolle - Google Patents

Steuervorrichtung mit Nockenwelle und Kraftübertragungsmittel mit Rolle Download PDF

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Publication number
EP0460988A1
EP0460988A1 EP91401298A EP91401298A EP0460988A1 EP 0460988 A1 EP0460988 A1 EP 0460988A1 EP 91401298 A EP91401298 A EP 91401298A EP 91401298 A EP91401298 A EP 91401298A EP 0460988 A1 EP0460988 A1 EP 0460988A1
Authority
EP
European Patent Office
Prior art keywords
roller
semi
cylindrical wall
axis
oil
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.)
Granted
Application number
EP91401298A
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English (en)
French (fr)
Other versions
EP0460988B1 (de
Inventor
Jean Frédéric Melchior
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Individual
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Individual
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Filing date
Publication date
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Publication of EP0460988A1 publication Critical patent/EP0460988A1/de
Application granted granted Critical
Publication of EP0460988B1 publication Critical patent/EP0460988B1/de
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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/181—Centre pivot rocking arms
    • F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
    • 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/08—Shape of cams
    • 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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/181—Centre pivot rocking arms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • F01M9/10—Lubrication of valve gear or auxiliaries
    • F01M9/101—Lubrication of valve gear or auxiliaries of cam surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • F01M9/10—Lubrication of valve gear or auxiliaries
    • F01M9/107—Lubrication of valve gear or auxiliaries of rocker shaft bearings
    • 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
    • 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
    • F01L2305/02—Mounting of rollers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20576—Elements
    • Y10T74/20882—Rocker arms
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2101—Cams
    • Y10T74/2107—Follower

Definitions

  • the invention relates to camshaft control devices and roller force transmitting means, making it possible to transmit an alternating movement, which is communicated by the cam of a camshaft rotating in a constant direction around its axis, to a mechanical member which is driven by a reciprocating movement and which is held in abutment on said cam by elastic return means.
  • These control devices are arranged to transmit the reciprocating movement to the mechanical member or else by means of a pusher carrying said roller and cooperating directly with said mechanical member (control by camshaft at the head), or indirectly by by means of a rocker arm oscillating around an axis and comprising a driving part which carries said roller and cooperates with the cam of the camshaft and a driven part which cooperates with the above-mentioned mechanical member.
  • the invention relates more particularly to control devices in which the force transmitting means with rollers are highly mechanically loaded, that is to say capable of transmitting significant efforts to ensure the mechanical organ a very rapid lifting and large amplitude.
  • the invention applies in particular, but not exclusively, to two-stroke engines with loop scanning, through the cylinder head, controlled exclusively by valves in order to actuate them.
  • valves In order to actuate them.
  • this section To compensate for the poor section offered by a valve for the passage of the working fluid, if we compare this section to that of lights arranged in the jacket of or of each engine cylinder, it is indeed desirable to open the valves in the shortest possible time, giving the cam the "stiffest" profile possible.
  • this type of two-stroke, valve-scavenged engine generally has masks partially blocking the passage opened by the intake valve when it is open, in order to reduce short- air circuits between the intake and exhaust ports. The presence of these masks further reduces the flow section of the valves.
  • a “substantially cylindrical roller” is a roller which has the shape of a cylinder of revolution, possibly with a slight bulge.
  • the flanges are made in one piece with the driving part of the rocker arm.
  • FIGS. 1 and 2 of these drawings represent a control device with camshaft and rocker arm established in accordance with the invention, in partial section respectively along the lines I-I in FIG. 2 and II-II in FIG. 1.
  • FIGS. 3 to 6 schematically represent each of the improvements made to the embodiment of FIGS. 1 and 2, by extracts on a larger scale of FIG. 1.
  • FIG. 7 represents a variant of part of FIG. 2.
  • FIG. 8 finally schematically represents a control device with camshaft and pusher.
  • a known mechanism for controlling by camshaft 1 and rocker arm 2 generally comprises an axis 3 around which the rocker arm pivots 2.
  • a roller 7 At the driving end of rocker arm 2 a roller 7, generally of a shape cylindrical. This roller 7 rolls, preferably without sliding, on the nose 8 of a cam 9 secured to the cam shaft 1.
  • the driven end of the rocker arm 2 cooperates, generally by means of a spherical articulation 10, with a mechanical member driven by an alternating movement, generally rectilinear or approximately rectilinear, such as valve stem 11, rocker stem, element injection pump or other.
  • FIG. 1 shows in full line the valve head 14 in position d opening and in phantom in the closed position, in abutment on the seat 15.
  • the roller 7 pivots on itself in a cavity 16 which is arranged in the driving part of the rocker arm 2 and delimited on the one hand by a circular semi-cylindrical wall 17, of axis XX parallel to the geometrical axis YY of rotation of the rocker arm 2 around the material axis 3 thereof and on the other hand by the interior walls of two plane lateral flanges 18 perpendicular to the axis XX of the semi-cylindrical wall 17.
  • the direction of rotation of the roller, as well as that of the camshaft 1, will be chosen so that the extreme generator 20 is as close as possible to the axis 3.
  • the flanges 18 are made in one piece with the driving part of the rocker arm 2, as shown diagrammatically in FIG. 2.
  • the outlet for the pressurized oil inlet 19 on the semi-cylindrical wall 17 is advantageously constituted by a transverse groove 21, arranged along the generator 20.
  • the above-mentioned arrival of pressurized oil 19 essentially consists of a channel 22 formed in the body of the rocker arm 2 and communicating with the oil supply circuit (not shown) by means of a peripheral groove 23 formed in axis 3, with a radial passage 24 provided in axis 3 and a channel 25 pierced longitudinally in axis 3.
  • the channel 22 can open directly into the groove 21, as shown in FIG. 1, or with the interposition of unidirectional means, located as close as possible to the outlet on the semi-cylindrical wall 17 and advantageously constituted by a non-return ball valve 26 , as shown in Figure 4, which has the effect of preventing the oil contained in the cavity 16 to be sucked back towards the channel 25 in the case of fluctuations in the pressure of the oil supply circuit.
  • the roller 7 is used in the cavity 16 in the manner of a hydrostatic piston in a cylinder supplied with oil under pressure, and this advantageously extending, as shown in FIG. 3, the semi-cylindrical wall 17 d axis XX by two walls 27 parallel to each other and to axis XX and tangent respectively to the ends of this semi-cylindrical wall 17.
  • the two ends of the semi-cylindrical wall 17 can be extended, as shown in FIG. 5, respectively, by tongues 28, the ends of which are separated by a distance slightly less than the diameter 2r of the roller 7, as shown diagrammatically in FIG. 5.
  • the metal of which the driving part of the rocker arm 2 is made and / or the thickness of the tongues 28 so as to be able to set up the roller 7 in the cavity 16 by a sufficient push to elastically spread the ends of the tongues 28, when the roller 7 passes, these ends then resuming their initial distance elastically so as to trap the roller 7 with play.
  • the permanent supply (in operation) of a hydrodynamic oil film in the gap limited by the semi-cylindrical wall 17 and by the cylindrical surface of the roller 7, prevents wear by preventing any metal / metal contact between the roller 7 and the body of the rocker arm 2, it may be advantageous to coat the surfaces in relative motion, or at least the semi-cylindrical wall 17, with an anti-friction coating such as, for example, a cuprous electrolytic deposit.
  • the roller 7 is full.
  • the roller 7 is preferably hollow and pierced, right through, with an axial hole 32 whose diameter, taking into account the material of which this roller 7 is made, is sufficiently weak to prevent any permanent deformation of said roller 7, under the forces to which it is subjected in operation, but sufficiently large to allow the elastic deformation of this roller 7 in contact with the cam 9 so as to reduce the Hertz pressure of the contact.
  • the inside diameter Di of the roller 7 is of the order of 70% of its outside diameter De.
  • a spacer circular cylindrical 33 with an outside diameter less than the inside diameter Di of the hollow roller 7, is mounted in the axis XX of the semi-cylindrical wall 17, integrally with the two lateral flanges 18, in which case the tongues 28 are no longer necessary.
  • a rocker control device is thus obtained, the operation of which is as follows.
  • the oil arriving under pressure in the groove 21 is distributed in the cavity 16 by the rotating roller 7 and it is maintained there under an intermediate pressure which depends on the supply pressure and on the section of the leakage passage formed by the clearance between the roller 7 and the walls of its housing.
  • a film of hydrostatic oil is thus maintained between the roller 7 and its housing and not only ensures the lubrication of the roller, but also its suspension inside the housing allowing it to roll despite the absence of a material axis and its keeping pressed against the cam 9, without the appearance of the usual rattling.
  • the pusher 34 acts directly on the mechanical member or valve stem 11 and in that the oil inlet channel 25 is disposed in the guide 35 of the pusher 34 and is connected to the channel 22 formed in the pusher 34 by means of an annular groove 36 formed at the periphery of the pusher 34.
  • the operating mode and the advantages of the pusher control device 34 are identical to those of the rocker control devices 2 or can be easily deduced by specialists.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
EP91401298A 1990-06-08 1991-05-21 Steuervorrichtung mit Nockenwelle und Kraftübertragungsmittel mit Rolle Expired - Lifetime EP0460988B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9007161A FR2663091B1 (fr) 1990-06-08 1990-06-08 Dispositif de commande par arbre a came et moyens transmetteurs d'efforts a galet.
FR9007161 1990-06-08

Publications (2)

Publication Number Publication Date
EP0460988A1 true EP0460988A1 (de) 1991-12-11
EP0460988B1 EP0460988B1 (de) 1995-03-01

Family

ID=9397422

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91401298A Expired - Lifetime EP0460988B1 (de) 1990-06-08 1991-05-21 Steuervorrichtung mit Nockenwelle und Kraftübertragungsmittel mit Rolle

Country Status (6)

Country Link
US (1) US5186130A (de)
EP (1) EP0460988B1 (de)
JP (1) JPH05106410A (de)
DE (1) DE69107687T2 (de)
ES (1) ES2069235T3 (de)
FR (1) FR2663091B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997002409A1 (de) * 1995-07-04 1997-01-23 Ina Wälzlager Schaeffler Kg Nockenfolger für einen ventiltrieb einer brennkraftmaschine
WO2008037524A1 (de) * 2006-09-28 2008-04-03 Robert Bosch Gmbh Stösselbaugruppe für eine hochdruckpumpe und hochdruckpumpe mit wenigstens einer stösselbaugruppe
WO2008052874A1 (de) * 2006-10-31 2008-05-08 Schaeffler Kg Ventiltriebs-hebel für eine brennkraftmaschine
WO2014063690A1 (de) * 2012-10-24 2014-05-01 Schaeffler Technologies AG & Co. KG Hebelartiger nockenfolger
EP2947285A1 (de) * 2014-05-22 2015-11-25 Aktiebolaget SKF Mechanisches System zur Darstellung eines Nockenfolgers bzw. eines Kipphebels mit einem inneren Volumen zur Aufnahme eines ein Ölbades

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FR2640412B1 (fr) * 1988-12-13 1991-01-04 Filotex Sa Cable electrique blinde muni de zones de raccordement rapide en derivation
DE4234868C2 (de) * 1992-10-16 1999-10-28 Schaeffler Waelzlager Ohg Verfahren zur Herstellung eines Schlepp- oder Kipphebels
US5239951A (en) * 1992-11-12 1993-08-31 Ford Motor Company Valve lifter
DE4241633A1 (de) * 1992-12-10 1994-06-16 Schaeffler Waelzlager Kg Schlepp- oder Kipphebel für einen Ventiltrieb einer Brennkraftmaschine
US5361733A (en) * 1993-01-28 1994-11-08 General Motors Corporation Compact valve lifters
US5431133A (en) * 1994-05-31 1995-07-11 General Motors Corporation Low mass two-step valve lifter
US5566652A (en) * 1995-10-06 1996-10-22 Eaton Corporation Light weight cam follower
DE19641791B4 (de) * 1995-10-24 2005-06-02 Volkswagen Ag Rollenantrieb, insbesondere für Brennstoffeinspritzpumpen
IT1279049B1 (it) * 1995-10-27 1997-12-04 Eaton Automotive Spa Punteria meccanica ad azione diretta dotata di un rullino di contatto con la camma dell'albero a camme di un motore a combustione interna
US5758620A (en) * 1997-03-21 1998-06-02 Detroit Diesel Corporation Engine compression brake system
US5921209A (en) * 1997-08-29 1999-07-13 Chrysler Corporation Roller arrangement for valve train mechanism
US6718940B2 (en) 1998-04-03 2004-04-13 Diesel Engine Retarders, Inc. Hydraulic lash adjuster with compression release brake
US6209498B1 (en) * 1998-12-01 2001-04-03 Competition Cams, Inc. Roller valve lifter with oiling channel
US6213075B1 (en) * 1999-06-10 2001-04-10 Caterpillar Inc. Roller follower assembly for an internal combustion engine
DE19932343A1 (de) * 1999-07-10 2001-04-19 Heinz Leiber Antrieb für ein Ventil eines Verbrennungsmotors
DE60043780D1 (de) * 1999-09-10 2010-03-18 Diesel Engine Retarders Inc Kipphebelsystem mit totgang und integrierter motorbremse
US6302075B1 (en) * 2000-01-07 2001-10-16 Delphi Technologies, Inc. Roller finger follower shaft retention apparatus
US7028654B2 (en) * 2002-10-18 2006-04-18 The Maclean-Fogg Company Metering socket
US7191745B2 (en) * 2002-10-18 2007-03-20 Maclean-Fogg Company Valve operating assembly
JP4618450B2 (ja) * 2008-01-18 2011-01-26 株式会社デンソー アクセル装置
US8166939B2 (en) * 2009-03-05 2012-05-01 GM Global Technology Operations LLC Cam bearing surface of an engine cylinder head that includes an axially extending oil passage
CN101956625B (zh) * 2010-10-31 2013-03-20 无锡开普动力有限公司 一种气缸盖的润滑结构
DE102013215455A1 (de) * 2013-08-06 2015-02-12 Schaeffler Technologies Gmbh & Co. Kg Nockenfolger
CN109899162B (zh) * 2019-03-19 2022-04-26 潍柴动力股份有限公司 一种排气制动系统及发动机

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FR549594A (fr) * 1922-03-31 1923-02-14 Système de graissage intermittent des leviers poussoirs de soupapes
US1565223A (en) * 1919-02-10 1925-12-08 Packard Motor Car Co Hydrocarbon motor
GB659654A (en) * 1949-06-03 1951-10-24 Continental Motors Corp Improvements in valve rockers for internal combustion engines
DE2840160A1 (de) * 1978-09-15 1980-03-20 Kloeckner Humboldt Deutz Ag Nockentrieb mit stoesseln
US4909197A (en) * 1989-08-16 1990-03-20 Cummins Engine Company, Inc. Cam follower assembly with pinless roller

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JP2710360B2 (ja) * 1988-10-06 1998-02-10 大日本印刷株式会社 合成樹脂製容器の検査装置
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Publication number Priority date Publication date Assignee Title
US1565223A (en) * 1919-02-10 1925-12-08 Packard Motor Car Co Hydrocarbon motor
FR549594A (fr) * 1922-03-31 1923-02-14 Système de graissage intermittent des leviers poussoirs de soupapes
GB659654A (en) * 1949-06-03 1951-10-24 Continental Motors Corp Improvements in valve rockers for internal combustion engines
DE2840160A1 (de) * 1978-09-15 1980-03-20 Kloeckner Humboldt Deutz Ag Nockentrieb mit stoesseln
US4909197A (en) * 1989-08-16 1990-03-20 Cummins Engine Company, Inc. Cam follower assembly with pinless roller

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997002409A1 (de) * 1995-07-04 1997-01-23 Ina Wälzlager Schaeffler Kg Nockenfolger für einen ventiltrieb einer brennkraftmaschine
WO2008037524A1 (de) * 2006-09-28 2008-04-03 Robert Bosch Gmbh Stösselbaugruppe für eine hochdruckpumpe und hochdruckpumpe mit wenigstens einer stösselbaugruppe
WO2008052874A1 (de) * 2006-10-31 2008-05-08 Schaeffler Kg Ventiltriebs-hebel für eine brennkraftmaschine
WO2014063690A1 (de) * 2012-10-24 2014-05-01 Schaeffler Technologies AG & Co. KG Hebelartiger nockenfolger
EP2947285A1 (de) * 2014-05-22 2015-11-25 Aktiebolaget SKF Mechanisches System zur Darstellung eines Nockenfolgers bzw. eines Kipphebels mit einem inneren Volumen zur Aufnahme eines ein Ölbades
US9441722B2 (en) 2014-05-22 2016-09-13 Aktiebolaget Skf Mechanical system forming a cam follower or a rocker arm, including an inner cavity adapted to contain an oil bath

Also Published As

Publication number Publication date
ES2069235T3 (es) 1995-05-01
EP0460988B1 (de) 1995-03-01
US5186130A (en) 1993-02-16
FR2663091A1 (fr) 1991-12-13
DE69107687T2 (de) 1995-06-29
FR2663091B1 (fr) 1995-02-17
DE69107687D1 (de) 1995-04-06
JPH05106410A (ja) 1993-04-27

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