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 PDFInfo
- 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
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
- 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)
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)
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)
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 |
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 |
Citations (4)
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 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
-
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/fr not_active Expired - Lifetime
- 1996-08-23 US US08/701,831 patent/US5899180A/en not_active Expired - Lifetime
Patent Citations (4)
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)
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 |
EP0761935A3 (fr) | 1998-02-11 |
DE19532334A1 (de) | 1997-03-06 |
US5899180A (en) | 1999-05-04 |
DE59608633D1 (de) | 2002-03-14 |
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