EP0761935B1 - Variabler Ventiltrieb, insbesondere für Brennkraftmaschinen - Google Patents
Variabler Ventiltrieb, insbesondere für Brennkraftmaschinen Download PDFInfo
- Publication number
- EP0761935B1 EP0761935B1 EP96110558A EP96110558A EP0761935B1 EP 0761935 B1 EP0761935 B1 EP 0761935B1 EP 96110558 A EP96110558 A EP 96110558A EP 96110558 A EP96110558 A EP 96110558A EP 0761935 B1 EP0761935 B1 EP 0761935B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- lever
- axis
- roller
- camshaft
- 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
Links
Images
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
- valve train is for change the valve timing and the valve stroke the gear ratio of the respective valve lever through a controlled displacement of the roller in the longitudinal direction of the valve lever changed.
- the invention has for its object a to further develop the generic valve train in such a way that a conventional valve lift is steplessly predetermined low stroke values can be reduced.
- the essence of the invention is that the role in the valve lever axis Position range using the in a predetermined arrangement controlled adjusting lever no relative movement to reduce stroke Valve lever executes while the roller in the valve lever axis is remote Position range by means of another Arrangement controlled adjustment lever by its Swivel movement a stroke-reducing relative movement opposite valve lever and control cam.
- the advantage of the invention is a stepless one Stroke adjustment over a range of e.g. 10 mm to down to about 2 mm valve lift.
- Adjusting lever With the end position of the swivel above Camshaft is easy to use swivel direction of the invention Adjusting lever a stroke-reducing relative movement the role in relation to the respective valve lever substantially prevented. With the invention End position of the swivel joint below the camshaft the pivoting adjustment lever causes a stroke-reducing relative movement of the roller Valve lever and control cam through displacement the roller towards the free valve lever end.
- roller guide in / on the valve lever concentric to the axis of rotation of the camshaft designed, with further stroke reduction the roller guide towards the free end of the valve lever a straight line and / or an opposite one curved arc passes.
- a structurally simple and stable design part of the adjustment device is further characterized achieved that the drive shaft of the adjusting device between similar lift valves on the machine side is stored, and on both sides of this storage each with a control lever in a rotationally fixed connection stands, with the control lever on one common bolts the two swivel joints for the Have adjustment levers.
- the invention is preferably used in a valve train with valve levers designed as rocker arms, the rocker arms via hydraulic valve lash adjusters with the respective lift valve in Drive connection. That advantageously at a rocker arm to be maintained in the usual arrangement Game compensation element also serves the Compensation in the roller guides.
- variable valve drive according to the invention is advantageously applicable to two similar, as intake valves serving lift valves for two adjacent Cylinder of an internal combustion engine. This results in another Shaping the possibility of any cylinder additionally with an inlet valve controlled in the usual way equip. While that according to the invention first intake valve of the Mixture homogenization and / or an internal In contrast, exhaust gas recirculation is suitable later and the second opening to the full stroke Inlet valve of the desired filling of the combustion chamber. If only air is supplied via the second one Inlet valve, the valve train according to the invention can be advantageous for lean operation of an internal combustion engine Find application.
- variable valve train parallel to Main power connection via camshaft, roller, valve lever and spring-loaded lift valve is switched, are in Control and adjustment lever effective forces relatively low, so that for the adjustment device a relatively poor performance Drive motor is sufficient.
- Variable valve train 1 For an internal combustion engine, not shown, is a Variable valve train 1 shown, in which a control cam 2 a camshaft 3 via an intermediate Roll 4 on an axis 5 movable rocker arm 6 for actuating an inlet valve 7 serving lift valve acts.
- Roll 4 is along a guide 8 on the valve lever or rocker arm 6 by means of a pivoting adjustment lever 9 an adjusting device arranged on the machine side 10 between a position range near the valve lever axis 11 and a valve lever axle remote Position range 12 can be shifted in a controlled manner.
- the adjusting device 10 common hinge 13 of the adjusting lever 9 by means of the adjusting device 10 along a path 14 in a substantially to the camshaft 3 vertical plane can be shifted in a controlled manner, that the adjusting lever 9 the roller 4 in Valve lever axis near position range 11 between Control cam 2 and rocker arm 6 in the direction of maximum Cam lift leads pivoting and that the adjusting lever 9 the roller 4 in the position area remote from the valve lever axis 12 along the guide 8 on the rocker arm 6 leads swiveling transversely to the cam elevation.
- roller guide 8 on the rocker arm 6 to the axis of rotation 15 of the camshaft 3 designed concentrically, this for further stroke reduction to the free end of the valve lever in a Straight and / or in an oppositely curved one Arc can pass.
- rollers 4 arranged on the adjusting levers 9 cooperate with rocker arm 6, which preferably over hydraulic valve lash adjuster 24 with the respective lift valve 7 in drive connection stand.
- a return spring, not shown, for each lift valve 7 causes the respective rocker arm 6 Roll 4 on the control cam 2.
- Valve lever axis remote position area 12 is one of these System supporting, on the adjustment lever 9 accordingly attacking spring element provided.
- This preferably as a leg spring 25 between the adjusting lever 9 and control lever 18 provided spring element can amount to a proportion of the above be called return spring, their interpretation is or can be reduced by this amount.
- variable valve drive according to the invention 1 is advantageously applicable to two of the same type Inlet valves serving lift valves 7 for two adjacent, Cylinder, not shown, of an internal combustion engine. In a further embodiment, this results in the Possibility of everyone with a stroke variable according to the invention Inlet valve 7 equipped cylinder additionally assign an inlet valve controlled in the usual way.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Description
- Figur 1
- einen in teilweise Explosionsdarstellung gezeigten variablen Ventiltrieb für zwei Hubventile,
- Figur 2
- eine im ventilhebelachsnahen Positionsbereich durch die erfindungsgemäße Verstellvorrichtung zwischen Steuernocken und Kipphebel für einen Maximalhub geführte Rolle und
- Figur 3
- die in einem ventilhebelachsfernen Positionsbereich durch die Verstellvorrichtung gehaltene Rolle für einen Minimalhub.
Claims (11)
- Variabler Ventiltrieb, insbesondere für Brennkraftmaschinen,bei dem ein Steuemocken (2) einer Nockenwelle (3) über eine zwischengeschaltete Rolle (4) auf einen um eine Achse (5) beweglichen Ventilhebel (6) zur Betätigung eines Hubventiles (7) einwirkt, wobeidie Rolle (4) längs einer zumindest abschnittsweise zur Drehachse der Nockenwelle (3) konzentrisch gestalteten Führung (8) im/am Ventilhebel (6) mittels eines schwenkbeweglichen Verstellhebels (9) einer um eine maschinenfeste Achse (16) beweglich angeordneten Verstellvorrichtung (10) zwischen einem ventilhebelachsnahen und einem ventilhebelachsfemen Positionsbereich (11, 12) gesteuert verlagerbar ist,daß die maschinenfeste Achse (16) der Verstellvorrichtung (10) - in Draufsicht gesehen - zwischen der Drehachse (15) der Nockenwelle (3) und der Ventilhebelachse (5) zu diesen achsparallel angeordnet ist mit einer koaxial angeordneten Antriebswelle (17) zum schwenkbeweglichen Antrieb eines Steuerhebels (18) mit einem im achsfernen, freien Endbereich angeordneten Drehgelenk (13) zur schwenkbeweglichen Führung des die Rolle (4) tragenden Verstellhebels (9), wobeiüber eine bogenförmig gestaltete Verlagerungs-Bahn (14) des Drehgelenkes (13) mit nockenwellenseitig vorgesehenen Krümmungsmittelpunkten von Bahnabschnitten die Rolle (4) über den Verstellhebel (9) derart zwischen Steuemocken (2) und Ventilhebel (6) geführt ist, daßdie Rolle (4) im ventilhebelachsnahen Positionsbereich (11) längs der zur Nockenwelle (3) konzentrischen Führung (8) des Ventilhebels (6) in Richtung maximale Nockenerhebung des Steuemockens (2) positionierbar ist, unddaß die Rolle (4) im ventilhebelachsfernen Positionsbereich (12) längs einer im Bereich des führungsseitig freien Endabschnittes des Ventilhebels (6) ausgebildeten Führung (8) mit einer Geraden und/oder einem entgegengesetzt gekrümmten Bogen (8') in Richtung minimaler Nockenerhebung positionierbar ist.
- Ventiltrieb nach Anspruch 1, dadurch gekennzeichnet,daß die Verlagerungs-Bahn (14) kreisbogenförmig ist mit einem Kreismittelpunkt derauf der Ventilhebelachse (5) oder der Nockenwellen-Drehachse(15) oder auf einer Parallelen (16) zu diesen Achsen (5, 15) liegt.
- Ventiltrieb nach Anspruch 1 und 2, dadurch gekennzeichnet,daß das Drehgelenk (13) über den Steuerhebel (18) längs der Kreisbogen-Bahn (14) zwischen einer Endstellung oberhalb der Nockenwelle (3) und einer Endstellung unterhalb der Nockenwelle (3) gesteuert verlagert ist.
- Ventiltrieb nach Ansprüch 3, dadurch gekennzeichnet,daß die Antriebswelle (17) der Verstellvorrichtung (10) zwischen zwei gleichartigen Hubventilen (7) maschinenseitig gelagert angeordnet ist, undbeiderseits dieser Lagerung mit jeweils einem Steuerhebel (18) in drehfester Verbindung steht, wobeidie Steuerhebel (18) an einem gemeinsamen Bolzen (19) die beiden Drehgelenke (13) für die Verstellhebel (9) aufweisen.
- Ventiltrieb nach Ansprüch 4, dadurch gekennzeichnet,daß den beiden Steuerhebeln (18) jeweils ein U-förmig gestalteter Verstellhebel (9) zugeordnet ist, wobeijeder Verstellhebel (9) zwischen freien Endbereichen bogenförmig gestalteter Schenkel (20) die jeweilige Rolle (4) drehbeweglich gelagert aufweist.
- Ventiltrieb nach Ansprüch 5, dadurch gekennzeichnet,daß die an den Verstellhebeln (9) angeordneten Rollen (4) mit als Kipphebel (6) gestalteten Ventilhebeln zusammenwirken, wobeidie Kipphebel (6) über hydraulische Ventilspielausgleichselemente (24) mit dem jeweiligen Hubventil (7) in Antriebsverbindung stehen.
- Ventiltrieb nach Ansprüch 6, dadurch gekennzeichnet, daß die zwei gleichartigen Hubventile (7) als Einlaßventile für zwei benachbarte Zylinder einer Brennkraftmaschine dienen.
- Ventiltrieb nach Ansprüch 7, dadurch gekennzeichnet, daß je Zylinder einer Brennkraftmaschine ein üblich gesteuertes und ein mittels der Verstellvorrichtung (10) zusätzlich steuerbares Einlaßventil (7) vorgesehen ist.
- Ventiltrieb nach einem oder mehreren der Ansprüche 4 bis 8, dadurch gekennzeichnet, daß am Verstellhebel (9) zumindest in der Stellung der Rolle (4) im ventilhebelachsferner Positionsbereich (12) ein die Anlage der Rolle (4) am Steuemocken (2) sicherndes Federelement (Schenkelfeder 25) angreifend angeordnet ist.
- Ventiltrieb nach Anspruch 9, dadurch gekennzeichnet, daß das Federelement eine den Verstellhebel (9) in Richtung des Steuerhebels (18) antreibende Schenkelfeder (25) ist.
- Ventiltrieb nach Anspruch 9 und 10, dadurch gekennzeichnet,daß die Schenkelfeder (25) entsprechend einem betragsmäßigen Anteil einer Rückstellfeder des Hubventils (7) ausgelegt ist, wobeidie Rückstellfeder um diesen Betrag reduziert ausgelegt sein kann.
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 EP0761935A2 (de) | 1997-03-12 |
EP0761935A3 EP0761935A3 (de) | 1998-02-11 |
EP0761935B1 true EP0761935B1 (de) | 2002-01-23 |
Family
ID=7771050
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96110558A Expired - Lifetime EP0761935B1 (de) | 1995-09-01 | 1996-06-29 | Variabler Ventiltrieb, insbesondere für Brennkraftmaschinen |
Country Status (4)
Country | Link |
---|---|
US (1) | US5899180A (de) |
EP (1) | EP0761935B1 (de) |
DE (2) | DE19532334A1 (de) |
ES (1) | ES2171206T3 (de) |
Families Citing this family (37)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9703605D0 (en) * | 1997-02-21 | 1997-04-09 | T & N Technology Ltd | Operating mechanisms for valves |
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 |
JP3799944B2 (ja) | 2000-03-21 | 2006-07-19 | トヨタ自動車株式会社 | 内燃機関の可変動弁機構および吸気量制御装置 |
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 (en) * | 2001-04-05 | 2002-10-17 | Stephen William Mitchell | Variable valve timing system |
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 |
DE10312961C5 (de) * | 2003-03-24 | 2009-01-29 | Thyssenkrupp Presta Teccenter Ag | Vorrichtung zur variablen Betätigung der Gaswechselventile von Verbrennungsmotoren |
DE10312959B4 (de) * | 2003-03-24 | 2006-10-05 | Thyssenkrupp Automotive 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 |
US7424873B2 (en) * | 2003-12-18 | 2008-09-16 | Toyota, Jidosha Kabushiki Kaisha | Variable valve mechanism |
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 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE800616C (de) * | 1949-07-21 | 1950-11-23 | Carl F W Borgward | Verbrennungskraftmaschine, insbesondere fuer Kraftfahrzeuge |
US4382428A (en) * | 1981-06-08 | 1983-05-10 | Tourtelot Jr Edward M | Contoured finger follower variable valve timing mechanism |
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 |
DE4220816A1 (de) * | 1992-06-25 | 1994-01-05 | Schaeffler Waelzlager Kg | Variable Ventilsteuerung mittels Änderung der Hebelverhältnisse bei Kipp- oder Schlepphebeln von Ventiltrieben |
DE4226163A1 (de) * | 1992-08-07 | 1994-02-10 | Schaeffler Waelzlager Kg | Motorventilabschaltung mittels Nockenrollenverlagerung |
GB9320204D0 (en) * | 1993-09-30 | 1993-11-17 | Lotus Car | Valve operating mechanism for internal combustion engines |
DE4420064A1 (de) * | 1994-06-08 | 1995-12-14 | Bayerische Motoren Werke Ag | Ventiltrieb mit variabler Steuerung der Ventilöffnungswinkel |
EP0717174A1 (de) * | 1994-12-12 | 1996-06-19 | Isuzu Motors Limited | Ventilantriebssystem für eine Brennkraftmaschine |
-
1995
- 1995-09-01 DE DE19532334A patent/DE19532334A1/de not_active Withdrawn
-
1996
- 1996-06-29 DE DE59608633T patent/DE59608633D1/de not_active Expired - Lifetime
- 1996-06-29 ES ES96110558T patent/ES2171206T3/es not_active Expired - Lifetime
- 1996-06-29 EP EP96110558A patent/EP0761935B1/de not_active Expired - Lifetime
- 1996-08-23 US US08/701,831 patent/US5899180A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ES2171206T3 (es) | 2002-09-01 |
EP0761935A2 (de) | 1997-03-12 |
EP0761935A3 (de) | 1998-02-11 |
DE19532334A1 (de) | 1997-03-06 |
US5899180A (en) | 1999-05-04 |
DE59608633D1 (de) | 2002-03-14 |
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