WO1996002739A1 - Dispositif d'actionnement simultane d'au moins deux soupapes a deux voies pour gaz - Google Patents

Dispositif d'actionnement simultane d'au moins deux soupapes a deux voies pour gaz Download PDF

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Publication number
WO1996002739A1
WO1996002739A1 PCT/EP1995/001496 EP9501496W WO9602739A1 WO 1996002739 A1 WO1996002739 A1 WO 1996002739A1 EP 9501496 W EP9501496 W EP 9501496W WO 9602739 A1 WO9602739 A1 WO 9602739A1
Authority
WO
WIPO (PCT)
Prior art keywords
bridge
bore
cam
coupling means
gas exchange
Prior art date
Application number
PCT/EP1995/001496
Other languages
German (de)
English (en)
Inventor
Johann Kecker
Original Assignee
Ina Wälzlager Schaeffler Kg
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 Wälzlager Schaeffler Kg filed Critical Ina Wälzlager Schaeffler Kg
Publication of WO1996002739A1 publication Critical patent/WO1996002739A1/fr

Links

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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0005—Deactivating valves
    • 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
    • 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 device for the simultaneous actuation of at least two gas exchange valves of an internal combustion engine with a bridge, which is arranged in a driving manner between a control cam and the gas exchange valves and is axially movably supported by end guide columns with respect to a cylinder head of the internal combustion engine, the bridge on its the end facing the control cam, in the area of its transverse center plane, has a cam starting element communicating with the control cam and cooperates with the gas exchange valves in the stroke direction on its end remote from the cam.
  • Such a cam follower is previously known from DE-A 40 23 886. This also consists of a bridge-shaped housing, which is acted on by a cam and at the same time acts on two gas exchange valves.
  • a disadvantage of the known cam follower is that it is permanent, i.e. H. is effective even at low speed / load. In this operating state of the internal combustion engine, for example, it would be desirable to shut down entire cylinders or rows of cylinders (V engines) in order to achieve fuel savings or emission minimization of exhaust gases.
  • the invention is therefore based on the object of providing a device for the simultaneous actuation of at least two gas exchange valves of an internal combustion engine, in which the disadvantages mentioned at the outset are eliminated and in which, in particular via a simply constructed mechanism, a safe valve shutdown of several simultaneously acting valves Gas exchange valves is realized.
  • the cam starting element is produced as a roller guided in a longitudinally movable piston or a slide formed thereon for drivingly decoupling the bridge from the lifting movement of the control cam, the piston being in a cam-side Bore of the bridge runs and is supported on its underside by the force of a pressure medium in the cam direction and at least one displaceable coupling means is arranged in the bridge, which at least in the case of coupling intersects an annular surface formed between the piston and its bore and at the same time in one complementary recess of the piston runs.
  • a low-wear switching operation is guaranteed at the same time by the cam-starting element that constantly starts at the control cam. It is also conceivable and envisaged to achieve only partial strokes of the relevant gas exchange valves by means of coupling means positioned in a height-distributed manner in the device. When choosing an axially movable slide tap in the bridge, it can be provided that this slide tap is suitably Layer. It is particularly advantageous if the cam start element in the base circle of the control cam projects only slightly beyond the bridge in the cam direction. Thus, the overall height of the entire device is influenced favorably and, if necessary, existing connection dimensions can be used. Instead of the piston described here, other elements are also provided as cam counter-rotors which are suitable for carrying out an oscillating movement in the bridge, for example also bar-shaped and similarly suitable ones.
  • a conical spring is provided as pressure medium for the cam starting element. By choosing this conical spring, the space required for the pressure medium in the bridge is minimized.
  • Other pressure means are also conceivable and provided, such as magnetic, electromagnetic and other suitable ones, as well as other mechanically acting ones.
  • From claim 4 shows a preferred arrangement of the coupling means in the bridge. It can also be provided to arrange at least two coupling means positioned in the bridge, which include the cam start element.
  • the coupling means can also be positioned parallel to an imaginary connecting line between the guide columns.
  • the scope of this invention also includes a solution in which the coupling means runs approximately radially to the cam start element.
  • a supply of hydraulic fluid to the hydraulic piston designed as a coupling means is produced in one embodiment of the invention via one of the guide columns.
  • the supply of the play compensation elements is realized via the respective other guide column.
  • an anti-rotation device for the piston by means of a pin which projects beyond the annular surface between the piston and its bore. It is also envisaged to give the piston or the cam start element such a non-rotationally symmetrical geometry, by means of which twisting in the relevant receptacle is prevented in any case.
  • a particularly low-friction cam tap in the piston is produced in that the roller runs on a pin above a roller bearing.
  • a slide bearing is also considered.
  • the piston can also be dome-shaped in the region of the roller and the roller can be supported on a plurality of rolling elements in the direction remote from the cam.
  • the bridge and / or the cam start element made of a lightweight and / or polymeric material to manufacture. This measure creates a further contribution with regard to mass reduction and lowering of the oscillating masses in the valve train. This leads to a reduction in the friction, the required valve spring forces can be reduced or the maximum speed of the internal combustion engine to be driven can be increased.
  • the coupling means is conical at least on its side facing the cam start element, a particularly secure locking of the piston in question is created in the event of a coupling, since a certain tolerance compensation is guaranteed.
  • claims 13 to 15 show that it is also intended to apply mechanical play compensation in the bridge.
  • other setting elements such as bolt-like ones, are also conceivable and provided, which can have exchangeable setting plates or the like at their end facing the gas exchange valve.
  • a nut is used here to simply secure the screw in position.
  • Figure 1 shows a longitudinal section through an inventive device
  • Figure 2 shows a cross section according to Figure 1;
  • FIG. 3 shows a partial view of Figure 1 with uncoupled Nockenanlauf ⁇
  • Figure 4 is a partial view of the bridge with mechanical play compensation elements.
  • This device 1 shows a device 1 for the simultaneous actuation of at least two gas exchange valves 2.
  • This device 1 consists of a bridge 3, which is operatively positioned between a control cam 4 of a camshaft, not shown, and the gas exchange valves 2.
  • the bridge 3 is guided at the end via guide columns 5 opposite a cylinder head of the internal combustion engine (not shown). It is also conceivable here to firmly connect the guide columns 5 to the bridge 3 and to produce the entire device so that it can move axially relative to the cylinder head.
  • the bridge 3 In the area of its transverse center plane, on its end face 6 facing the control cam 4, the bridge 3 has a longitudinally movable piston as a cam starting element 7.
  • a roller 8 is arranged in the cam start element 7.
  • This roller 8 runs on a pin 9 above a roller bearing 10.
  • the roller 8 is thus produced as a low-friction counter-rotor for the control cam 4.
  • the cam start element 7 is supported by a pressure medium 11 against a base 12 of a bore 20 for the cam start element 7. Ande- on the one hand, the pressure medium 11 acts on an underside 13 of the cam start element 7.
  • the pressure medium 11 is designed as a conical spring. It is also conceivable to apply a plurality of such springs, which can also be cylindrical, to support the cam starting element 7.
  • a hydraulic lash adjuster 14 is assigned to each gas exchange valve 2 in the bridge 3.
  • a supply of hydraulic fluid to the play compensation elements 14 is established via one of the guide columns 5.
  • this guide column 5 has an axial bore 15 out of the cylinder head of the internal combustion engine, which communicates with an oil supply gallery in the cylinder head.
  • This axial bore 15 is connected to a radial bore 16 in the guide sleeve 5.
  • a transverse bore 17 runs in the bridge 3 parallel to its end face 6 (see also FIGS. 2, 3).
  • This cross-bore 17, which synergizes at least over partial sections of a stroke of the bridge 3 with the radial bore 16, provides a sufficient supply of the relevant play-compensation elements 14 with hydraulic medium.
  • Via a further axial bore 18 in the further guide column 5 a coupling means 18a displaceable in the bridge 3 parallel to the camshaft direction is realized.
  • This coupling means 18a here in the form of a piston, extends tangentially to an annular surface 19 between the piston as the cam starting element 7 and its bore 20 surrounding it.
  • the cam starting element 7 has on its underside 13 a complementary recess 21 for the coupling means 18a in the area of the coupling means 18a.
  • the piston also has an annular recess 22 as the coupling means 18a (see FIG. 2).
  • the coupling means 18a is acted upon by hydraulic means from a transverse bore 24.
  • This cross bore 24 is again during certain lifting sections of the bridge 3 with a radial bore 25 through the guide column 5, which is not used to supply the play compensation elements 14.
  • This radial bore 25 opens into the axial bore 18 of the guide column 5 in question.
  • a compression spring 27 is applied, which on the other hand is supported on the base 28 of the bore 29 surrounding the coupling means 18a.
  • the coupling means 18a is axially displaced in its bore 29 by hydraulic means in the direction of the base 28.
  • the actual piston surface of the coupling means 18a thus comes out of engagement with the recess 21 on the underside 13 of the cam starting element 7. Since the recess 22 of the coupling means 18a is now cut directly by the cam starting element 7, this can move axially freely in its bore 20.
  • the cam start element 7 thus follows the lifting movement of the control cam 4 against the force of the pressure medium 11 (see FIG. 1). Due to the idle stroke of the cam start element 7 with respect to the bridge 3, the gas exchange valves 2 in question remain closed.
  • a coupling of the cam starting element 7 to the lifting movement of the control cam 4 is preferably implemented in a base circle phase of the control cam 4.
  • the pressure of hydraulic medium applied to the end face 23 of the coupling means 18a is minimized in such a way that the coupling means 18a is pushed into its coupling position by the force of the compression spring 27.
  • the coupling means 18a engages with partial sections of its piston surface in the complementary recess 21 of the cam starting element 7 facing it.
  • This coupling restores the frictional engagement between the cam starting element 7, bridge 3 and gas exchange valves 2.
  • the gas exchange valves 2 open in the sense of the stroke contour of the control cam 4.
  • a recess 30 is provided in the bore 20 of the bridge 3 for the coupling means 7.
  • a rolling element 31 runs in this recess 30.
  • This rolling element 31 projects radially inward beyond the annular surface 19.
  • it runs in a complementary recess 32 of the cam starting element 7, which is designed here as a longitudinal groove. This measure makes the cam starting element 7 easy to twist realized opposite the bridge 3.
  • FIG. 3 shows the cam start element 7 in its uncoupled position. With its outer jacket 33, the cam start element 7 cuts the cutout 22 of the coupling means 18a.
  • FIG. 4 shows in a partial view of bridge 3 that it is also intended to use mechanical play compensation 35 instead of the hydraulic play compensation elements 14 used.
  • This mechanical clearance compensation 35 is advantageously designed as a screw and runs in a bore 36 of the bridge 3 aligned with the gas exchange valves 2.
  • the screw 37 is seated with its end 37 directly on one end 38 of the gas exchange valve 2.
  • the screw is provided with a nut 40 as a securing element.

Abstract

L'invention concerne un dispositif (1) d'actionnement simultané d'au moins deux soupapes à deux voies pour gaz (2) qui se présente sous forme de pont (3). Pour séparer le pont (3) d'une levée de came (4), il est prévu selon l'invention, d'appliquer dans le pont (3) un élément suiveur (7) de la came, blocable et déblocable.
PCT/EP1995/001496 1994-07-19 1995-04-20 Dispositif d'actionnement simultane d'au moins deux soupapes a deux voies pour gaz WO1996002739A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9411680U DE9411680U1 (de) 1994-07-19 1994-07-19 Einrichtung zur gleichzeitigen Betätigung von zumindest zwei Gaswechselventilen
DEG9411680.6U 1994-07-19

Publications (1)

Publication Number Publication Date
WO1996002739A1 true WO1996002739A1 (fr) 1996-02-01

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PCT/EP1995/001496 WO1996002739A1 (fr) 1994-07-19 1995-04-20 Dispositif d'actionnement simultane d'au moins deux soupapes a deux voies pour gaz

Country Status (2)

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DE (1) DE9411680U1 (fr)
WO (1) WO1996002739A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1733125A2 (fr) * 2004-03-15 2006-12-20 Jacobs Vehicle Systems, Inc. Crosse de soupapes a systeme integre de maitrise de la perte de mouvement
US9474857B2 (en) 2009-07-24 2016-10-25 Bayer Healthcare Llc Multi-fluid medical injector system and methods of operation
WO2020097242A1 (fr) * 2018-11-06 2020-05-14 Jacobs Vehicle Systems, Inc. Systèmes de pont de soupapes comprenant un guide de pont de soupapes
US11053819B2 (en) 2018-11-06 2021-07-06 Jacobs Vehicle Systems, Inc. Valve bridge systems comprising valve bridge guide
US11319842B2 (en) 2018-11-06 2022-05-03 Jacobs Vehicle Systems, Inc. Valve bridge comprising concave chambers

Families Citing this family (7)

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Publication number Priority date Publication date Assignee Title
US6076491A (en) * 1994-05-03 2000-06-20 Lotus Cars Limited Valve control mechanism
DE69513165T2 (de) * 1994-05-03 2000-06-15 Lotus Car Ventilantriebsvorrichtung
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
DE19803246A1 (de) * 1998-01-28 1999-08-05 Meta Motoren Energietech Vorrichtung zum Betätigen wenigstens eines Ladungswechselventils einer Brennkraftmaschine
GB2478285A (en) * 2010-03-01 2011-09-07 Mechadyne Plc Valve mechanism for an internal combustion engine
DE102010011440A1 (de) * 2010-03-15 2011-09-15 Schaeffler Technologies Gmbh & Co. Kg Kipp- oder Schlepphebel, insbesondere für Hubkolbenbrennkraftmaschinen
KR101911011B1 (ko) * 2014-09-18 2018-10-23 자콥스 비히클 시스템즈, 인코포레이티드. 유압식 래시 어저스터를 포함하는 밸브 트레인과의 사용을 위한 밸브 브리지 내의 로스트 모션 조립체

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GB132070A (en) * 1917-09-29 1919-09-11 Alessandro Anzani Improvements relating to the Valves of Internal Combustion Engines.
FR1133730A (fr) * 1955-10-18 1957-04-01 Automobiles Ettore Bugatti Commande de soupape, en particulier pour moteur à explosion ou à combustion
JPS61241409A (ja) * 1985-04-16 1986-10-27 Yanmar Diesel Engine Co Ltd 内燃機関の動弁休止装置
WO1992010650A1 (fr) * 1990-12-08 1992-06-25 Ina Wälzlager Schaeffler Kg Installation pour l'actionnement simultane de deux soupapes de cylindre d'un moteur a combustion interne

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JPS63268904A (ja) * 1987-04-24 1988-11-07 Fuji Heavy Ind Ltd 動弁系のバルブクリアランス調整方法
DE4023885A1 (de) * 1990-07-27 1992-01-30 Bayerische Motoren Werke Ag Rollenstoessel mit hydraulischem ventilspiel-ausgleich
DE4206898A1 (de) * 1992-03-05 1993-09-09 Bayerische Motoren Werke Ag Vorrichtung zur variablen hubsteuerung eines gaswechselventils einer brennkraftmaschine
DE4213856C2 (de) * 1992-04-27 1994-08-04 Iav Motor Gmbh Ventiltrieb für Ladungswechselventile, von Hubkolbenbrennkraftmaschinen
DE9316125U1 (de) * 1993-10-22 1993-12-16 Schaeffler Waelzlager Kg Einrichtung zur gleichzeitigen Betätigung zweier Gaswechselventile einer Brennkraftmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB132070A (en) * 1917-09-29 1919-09-11 Alessandro Anzani Improvements relating to the Valves of Internal Combustion Engines.
FR1133730A (fr) * 1955-10-18 1957-04-01 Automobiles Ettore Bugatti Commande de soupape, en particulier pour moteur à explosion ou à combustion
JPS61241409A (ja) * 1985-04-16 1986-10-27 Yanmar Diesel Engine Co Ltd 内燃機関の動弁休止装置
WO1992010650A1 (fr) * 1990-12-08 1992-06-25 Ina Wälzlager Schaeffler Kg Installation pour l'actionnement simultane de deux soupapes de cylindre d'un moteur a combustion interne

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PATENT ABSTRACTS OF JAPAN vol. 11, no. 86 (M - 572) 17 March 1987 (1987-03-17) *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1733125A2 (fr) * 2004-03-15 2006-12-20 Jacobs Vehicle Systems, Inc. Crosse de soupapes a systeme integre de maitrise de la perte de mouvement
EP1733125A4 (fr) * 2004-03-15 2010-10-27 Jacobs Vehicle Systems Inc Crosse de soupapes a systeme integre de maitrise de la perte de mouvement
US7905208B2 (en) 2004-03-15 2011-03-15 Jacobs Vehicle Systems, Inc. Valve bridge with integrated lost motion system
US8578901B2 (en) 2004-03-15 2013-11-12 Jacobs Vehicle Systems, Inc. Valve bridge with integrated lost motion system
US9474857B2 (en) 2009-07-24 2016-10-25 Bayer Healthcare Llc Multi-fluid medical injector system and methods of operation
US10751465B2 (en) 2009-07-24 2020-08-25 Bayer Healthcare Llc Multi-fluid medical injector system and methods of operation
WO2020097242A1 (fr) * 2018-11-06 2020-05-14 Jacobs Vehicle Systems, Inc. Systèmes de pont de soupapes comprenant un guide de pont de soupapes
US10883392B2 (en) 2018-11-06 2021-01-05 Jacobs Vehicle Systems, Inc. Valve bridge systems comprising valve bridge guide
CN112955632A (zh) * 2018-11-06 2021-06-11 雅各布斯车辆系统公司 包含气门桥引导件的气门桥系
US11053819B2 (en) 2018-11-06 2021-07-06 Jacobs Vehicle Systems, Inc. Valve bridge systems comprising valve bridge guide
US11319842B2 (en) 2018-11-06 2022-05-03 Jacobs Vehicle Systems, Inc. Valve bridge comprising concave chambers
CN112955632B (zh) * 2018-11-06 2022-09-16 雅各布斯车辆系统公司 包含气门桥引导件的气门桥系

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