EP0761935A2 - Entraînement de soupape variable, en particulier pour moteurs à combustion interne - Google Patents

Entraînement de soupape variable, en particulier pour moteurs à combustion interne Download PDF

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Publication number
EP0761935A2
EP0761935A2 EP96110558A EP96110558A EP0761935A2 EP 0761935 A2 EP0761935 A2 EP 0761935A2 EP 96110558 A EP96110558 A EP 96110558A EP 96110558 A EP96110558 A EP 96110558A EP 0761935 A2 EP0761935 A2 EP 0761935A2
Authority
EP
European Patent Office
Prior art keywords
valve
lever
camshaft
axis
roller
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
EP96110558A
Other languages
German (de)
English (en)
Other versions
EP0761935B1 (fr
EP0761935A3 (fr
Inventor
Gert Fischer
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
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Filing date
Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0761935A2 publication Critical patent/EP0761935A2/fr
Publication of EP0761935A3 publication Critical patent/EP0761935A3/fr
Application granted granted Critical
Publication of EP0761935B1 publication Critical patent/EP0761935B1/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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • 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
    • 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
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0021—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio

Definitions

  • the invention is based on the preamble of claim 1 from DE-A 42 26 163.
  • the invention has for its object to develop a generic valve train such that a conventional valve lift can be reduced continuously to predetermined low stroke values.
  • the essence of the invention is that the roller in the position area near the valve lever axis by means of the adjusting lever controlled in a predetermined arrangement does not perform a relative movement to the valve lever which reduces the stroke, while the roller in the position area remote from the valve lever axis by means of the adjusting lever controlled in another arrangement by means of its pivoting movement counteracts a stroke-reducing relative movement Valve lever and control cam executes.
  • the advantage of the invention is a continuous stroke adjustment over a range of, for example, 10 mm down to approximately 2 mm valve stroke.
  • an adjustment device which is simple in construction and takes up little space is achieved by an arc-shaped displacement path for the rotary joint, the center of curvature of a preferably circular path being on an axis parallel to the camshaft, at least parallel to the axis of rotation of the camshaft.
  • An advantageously small space requirement or space requirement is achieved in a further embodiment in that - seen in plan view - an axially parallel drive shaft of the adjusting device is provided between the camshaft axis of rotation and a valve lever axis, which drives the drive of a control lever partially encompassing the camshaft with outdoors End region arranged pivot joint for the adjusting lever, and which the pivot joint is displaced in a controlled manner via the control lever along an arc path between an end position above the camshaft and an end position below the camshaft.
  • the roller guide in / on the valve lever is concentric with the axis of rotation of the camshaft, the roller guide merging into a straight line and / or an oppositely curved arc toward the free end of the valve lever in order to further reduce the stroke.
  • a structurally simple and stable design of a part of the adjusting device is further achieved in that the drive shaft of the adjusting device is arranged on the machine side between identical lift valves, and on both sides of this bearing is in a rotationally fixed connection with a control lever in each case, the control levers on a common bolt the two Have swivel joints for the adjustment lever.
  • control levers are each assigned a U-shaped adjusting lever, each adjusting lever having the respective roller rotatably mounted between the free end regions of its arc-shaped legs adapted to the camshaft.
  • the invention is preferably used in a valve train with valve levers designed as rocker arms, the rocker arms being in drive connection with the respective globe valve via hydraulic valve play compensation elements.
  • the clearance compensation element to be retained advantageously in a rocker arm in the usual arrangement also serves to compensate in the roller guides.
  • the variably designed valve train according to the invention can advantageously be used with two identical lift valves serving as intake valves for two adjacent cylinders of an internal combustion engine.
  • this gives the possibility of additionally equipping each cylinder with an inlet valve controlled in the usual way.
  • the controlled according to the invention on minimum stroke serves the first inlet valve of the mixture homogenization and / or an internal exhaust gas recirculation
  • the second inlet valve on the other hand, which opens later and up to the full stroke, is suitable for the desired filling of the combustion chamber.
  • the valve train according to the invention can advantageously be used for lean operation of an internal combustion engine.
  • variable valve drive Since the above-described mechanism of the variable valve drive according to the invention is connected in parallel to the main power connection via camshaft, roller, valve lever and spring-loaded lift valve, the forces acting in the control and adjusting lever are relatively low, so that a relatively poor-performing drive motor is sufficient for the adjusting device.
  • a variable valve train 1 for an internal combustion engine, not shown, a variable valve train 1 is shown, in which a control cam 2 of a camshaft 3 acts via an intermediate roller 4 on a rocker arm 6 movable about an axis 5 for actuating a lift valve serving as an inlet valve 7.
  • the roller 4 can be displaced in a controlled manner along a guide 8 on the valve lever or rocker arm 6 by means of a pivotable adjusting lever 9 of an adjusting device 10 arranged on the machine side between a position region 11 near the valve lever axis and a position region 12 remote from the valve lever axis.
  • the joint 13 of the adjustment lever 9 common with the adjustment device 10 is longitudinal by means of the adjustment device 10 a track 14 in a plane essentially perpendicular to the camshaft 3 so that it can be displaced in a controlled manner such that the adjusting lever 9 swivels the roller 4 in the position area 11 near the valve lever axis between control cam 2 and rocker arm 6 in the direction of the maximum cam elevation and that the adjusting lever 9 moves the roller 4 in the position area remote from the valve lever axis 12 leads along the guide 8 on the rocker arm 6 pivoting transversely to the cam elevation.
  • the displacement path 14 of the swivel joint 13 is in the form of an arc of a circle, the center of the circle of the path 14 lying on a provided parallel line 16 between the valve lever axis 5 and the camshaft axis of rotation 15, as seen in the end view of the valve drive 1 .
  • an aligned drive shaft 17 of the adjusting device 10 is provided with this parallel 16 between the axis of rotation 15 of the camshaft 3 and the valve lever axis 5.
  • the drive shaft 17 is used to drive the camshaft 3 partially encompassing control levers 18 with pivot joints 13 arranged in the free end regions for the adjusting lever 9.
  • the pivot joints 13 are via the control lever 18 along an arc path 14 between an end position above the Camshaft 3 - Figure 2 - and an end position below the camshaft 3 - Figure 3 - shifted in a controlled manner to achieve a stroke change against minimum values.
  • roller guide 8 on the rocker arm 6 is concentric with the axis of rotation 15 of the camshaft 3, which can merge into a straight line and / or an oppositely curved arc for further stroke lowering towards the free valve lever end.
  • the drive shaft 17 of the adjusting device 10 is arranged on the machine side between two identical lift valves 7 and is on both sides of this storage with control levers 18 in a rotationally fixed connection, the control levers 18 having the two pivot joints 13 for the adjusting lever 9 on a common bolt 19.
  • Figure 1 further shows that the control levers 18 are assigned U-shaped adjustment levers 9, each adjustment lever 9 having the respective roller 4 rotatably mounted between the free end regions of its legs 20 which are designed to partially encircle the camshaft 3.
  • each roller 4 cooperates with its outer ring 21 with the respective control cam 2 of the camshaft 3, while it is connected to the guides 8 of the respective rocker arm 6 via their pin sections 22 in a rolling or sliding connection.
  • each roller 4 is arranged securely in the respective adjusting lever 9 in its leg 20.
  • rollers 4 arranged on the adjusting levers 9 interact with rocker arms 6, which are preferably connected to the respective lift valve 7 by means of hydraulic valve lash compensation elements 24.
  • a return spring (not shown) for each lifting valve 7 causes the roller 4 to rest against the control cam 2 via the respective rocker arm 6.
  • a spring element supporting this system and correspondingly engaging the adjusting lever 9 is provided .
  • This spring element which is preferably provided as a leg spring 25 between the adjusting lever 9 and the control lever 18, can be designed for an amount of the above-mentioned return spring, the design of which is or can be reduced by this amount.
  • the variably designed valve train 1 can advantageously be used with two identical lift valves 7 serving as inlet valves for two adjacent cylinders, not shown, of an internal combustion engine.
  • this gives the possibility of additionally assigning an intake valve controlled in the usual manner to each cylinder equipped with an intake valve 7 which is variable according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
EP96110558A 1995-09-01 1996-06-29 Entraínement de soupape variable, en particulier pour moteurs à combustion interne Expired - Lifetime EP0761935B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19532334A DE19532334A1 (de) 1995-09-01 1995-09-01 Variabler Ventiltrieb, insbesondere für Brennkraftmaschinen
DE19532334 1995-09-01

Publications (3)

Publication Number Publication Date
EP0761935A2 true EP0761935A2 (fr) 1997-03-12
EP0761935A3 EP0761935A3 (fr) 1998-02-11
EP0761935B1 EP0761935B1 (fr) 2002-01-23

Family

ID=7771050

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96110558A Expired - Lifetime EP0761935B1 (fr) 1995-09-01 1996-06-29 Entraínement de soupape variable, en particulier pour moteurs à combustion interne

Country Status (4)

Country Link
US (1) US5899180A (fr)
EP (1) EP0761935B1 (fr)
DE (2) DE19532334A1 (fr)
ES (1) ES2171206T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2322412A (en) * 1997-02-21 1998-08-26 T & N Technology Ltd Variable timing valve operating mechanism
US6425357B2 (en) 2000-03-21 2002-07-30 Toyota Jidosha Kabushiki Kaisha Variable valve drive mechanism and intake air amount control apparatus of internal combustion engine

Families Citing this family (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3485434B2 (ja) * 1997-04-04 2004-01-13 株式会社日立ユニシアオートモティブ 内燃機関の動弁装置
US5988125A (en) * 1997-08-07 1999-11-23 Unisia Jecs Corporation Variable valve actuation apparatus for engine
JP3893202B2 (ja) * 1997-11-07 2007-03-14 株式会社日立製作所 内燃機関の可変動弁装置
US6041746A (en) * 1997-12-09 2000-03-28 Nissan Motor Co., Ltd. Variable valve actuation apparatus
DE19859564B4 (de) * 1997-12-26 2005-09-08 Nissan Motor Co., Ltd., Yokohama Variable Ventilverstellvorrichtung
DE19801964A1 (de) * 1998-01-21 1999-07-22 Audi Ag Vorrichtung zur Unterbrechung des Kraftflusses zwischen wenigstens einem Ventil und wenigstens einem Nocken einer Nockenwelle
JP3924078B2 (ja) * 1998-05-21 2007-06-06 株式会社日立製作所 内燃機関の可変動弁装置
DE19825307A1 (de) * 1998-06-05 1999-12-09 Bayerische Motoren Werke Ag Ventilsteuerung für eine Brennkraftmaschine
DE19825308A1 (de) * 1998-06-05 1999-12-09 Bayerische Motoren Werke Ag Variabler Ventiltrieb für eine Brennkraftmaschine
US6019076A (en) * 1998-08-05 2000-02-01 General Motors Corporation Variable valve timing mechanism
US6135075A (en) * 1999-03-10 2000-10-24 Boertje; Brian H. Variable cam mechanism for an engine
DE19913742A1 (de) * 1999-03-26 2000-09-28 Bayerische Motoren Werke Ag Vorrichtung zur Hubverstellung eines Gaswechselventils im Zylinderkopf einer Brennkraftmaschine
ATE220444T1 (de) * 1999-10-29 2002-07-15 Sts System Technology Services Mechanische regelung der hubverstellung des einlassventils eines verbrennungsmotors
GB2357131A (en) * 1999-12-09 2001-06-13 Mechadyne Internat Plc Valve actuating mechanism
JP2001164911A (ja) * 1999-12-10 2001-06-19 Yamaha Motor Co Ltd ４サイクルエンジンの動弁機構
DE19960742B4 (de) * 1999-12-16 2006-09-28 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Variabler Ventiltrieb, vorzugsweise für Verbrennungsmotoren
US6360705B1 (en) * 2000-10-19 2002-03-26 General Motors Corporation Mechanism for variable valve lift and cylinder deactivation
US6446589B1 (en) * 2001-01-16 2002-09-10 Chinh T. Nguyen Cam actuated continuous simultaneously variable valve timing and lifting assembly
WO2002081872A1 (fr) * 2001-04-05 2002-10-17 Stephen William Mitchell Systeme de distribution a programme variable
US6539909B2 (en) 2001-05-03 2003-04-01 International Engine Intellectual Property Company, L.L.C. Retractable seat valve and method for selective gas flow control in a combustion chamber
GR20010100295A (el) * 2001-06-18 2003-02-27 Εμμανουηλ Παττακος Μεταβλητο συστημα βαλβιδων
DE10136612A1 (de) * 2001-07-17 2003-02-06 Herbert Naumann Variable Hubventilsteuerungen
US6491008B1 (en) * 2001-10-18 2002-12-10 Ford Global Technologies, Inc. Variable valve timing adjustable roller rocker arm assembly
US6550435B1 (en) * 2002-01-17 2003-04-22 Ford Global Technologies, Llc Variable valve timing adjustable finger follower assembly
DE10221133A1 (de) * 2002-05-13 2003-11-27 Thyssen Krupp Automotive Ag Antriebs- und Verstellsystem für variable Ventilsteuerungen
JP4057855B2 (ja) 2002-07-05 2008-03-05 本田技研工業株式会社 内燃機関の動弁装置
US6978751B2 (en) * 2002-07-18 2005-12-27 Kohler Co. Cam follower arm for an internal combustion engine
DE10312959B4 (de) * 2003-03-24 2006-10-05 Thyssenkrupp Automotive Ag Vorrichtung zur variablen Betätigung der Gaswechselventile von Verbrennungsmotoren
DE10312961C5 (de) * 2003-03-24 2009-01-29 Thyssenkrupp Presta Teccenter Ag Vorrichtung zur variablen Betätigung der Gaswechselventile von Verbrennungsmotoren
DE10312958B4 (de) * 2003-03-24 2005-03-10 Thyssen Krupp Automotive Ag Vorrichtung zur vairablen Betätigung der Gaswechselventile von Verbrennungsmotoren und Verfahren zum Betreiben einer derartigen Vorrichtung
EP1710402B1 (fr) * 2003-12-18 2013-06-19 Toyota Jidosha Kabushiki Kaisha Mecanisme de distributeur variable
KR20090056602A (ko) * 2007-11-30 2009-06-03 현대자동차주식회사 가변 밸브 리프트 장치
US8033261B1 (en) 2008-11-03 2011-10-11 Robbins Warren H Valve actuation system and related methods
ITBO20090063A1 (it) * 2009-02-10 2010-08-11 Moto Morini S P A Dispositivo per il controllo dell'alzata di una valvola per un motore
DE102017119348A1 (de) * 2017-08-24 2019-02-28 Man Truck & Bus Ag Variabler Ventiltrieb

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2100344A (en) * 1981-06-08 1982-12-22 Tourtelot Edward Mortimer Ic engine variable valve timing mechanism
DE4220816A1 (de) * 1992-06-25 1994-01-05 Schaeffler Waelzlager Kg Variable Ventilsteuerung mittels Änderung der Hebelverhältnisse bei Kipp- oder Schlepphebeln von Ventiltrieben
WO1995009298A1 (fr) * 1993-09-30 1995-04-06 Lotus Cars Ltd. Mecanisme d'actionnement de soupape pour moteurs a combustion interne
EP0717174A1 (fr) * 1994-12-12 1996-06-19 Isuzu Motors Limited Système de commande de soupape pour moteur à combustion interne

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DE800616C (de) * 1949-07-21 1950-11-23 Carl F W Borgward Verbrennungskraftmaschine, insbesondere fuer Kraftfahrzeuge
US4469056A (en) * 1983-02-22 1984-09-04 Tourtelot Jr Edward M Dual follower variable valve timing mechanism
US5003939A (en) * 1990-02-26 1991-04-02 King Brian T Valve duration and lift variator for internal combustion engines
DE4226163A1 (de) * 1992-08-07 1994-02-10 Schaeffler Waelzlager Kg Motorventilabschaltung mittels Nockenrollenverlagerung
DE4420064A1 (de) * 1994-06-08 1995-12-14 Bayerische Motoren Werke Ag Ventiltrieb mit variabler Steuerung der Ventilöffnungswinkel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2100344A (en) * 1981-06-08 1982-12-22 Tourtelot Edward Mortimer Ic engine variable valve timing mechanism
DE4220816A1 (de) * 1992-06-25 1994-01-05 Schaeffler Waelzlager Kg Variable Ventilsteuerung mittels Änderung der Hebelverhältnisse bei Kipp- oder Schlepphebeln von Ventiltrieben
WO1995009298A1 (fr) * 1993-09-30 1995-04-06 Lotus Cars Ltd. Mecanisme d'actionnement de soupape pour moteurs a combustion interne
EP0717174A1 (fr) * 1994-12-12 1996-06-19 Isuzu Motors Limited Système de commande de soupape pour moteur à combustion interne

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2322412A (en) * 1997-02-21 1998-08-26 T & N Technology Ltd Variable timing valve operating mechanism
US6425357B2 (en) 2000-03-21 2002-07-30 Toyota Jidosha Kabushiki Kaisha Variable valve drive mechanism and intake air amount control apparatus of internal combustion engine

Also Published As

Publication number Publication date
EP0761935B1 (fr) 2002-01-23
ES2171206T3 (es) 2002-09-01
DE59608633D1 (de) 2002-03-14
US5899180A (en) 1999-05-04
DE19532334A1 (de) 1997-03-06
EP0761935A3 (fr) 1998-02-11

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