EP1380728A1 - Ventiltriebseinrichtung - Google Patents
Ventiltriebseinrichtung Download PDFInfo
- Publication number
- EP1380728A1 EP1380728A1 EP02450157A EP02450157A EP1380728A1 EP 1380728 A1 EP1380728 A1 EP 1380728A1 EP 02450157 A EP02450157 A EP 02450157A EP 02450157 A EP02450157 A EP 02450157A EP 1380728 A1 EP1380728 A1 EP 1380728A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- limiting element
- drive device
- stroke
- lift
- 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
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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
-
- 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
- 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
- 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
- F01L13/0031—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 tappet or pushrod length
Definitions
- the invention relates to a valve drive device for at least one lift valve for an internal combustion engine, the stroke of the lift valve being variably adjustable is, with a camshaft with at least one cam, which is on a valve stem of the lift valve in the opening direction against one preferably by acts a first valve spring formed closing force.
- valve train mechanisms are known with which the valve lift of a gas exchange valve of an internal combustion engine can be changed.
- US 5,365,895 A discloses a variable valve lift mechanism for a Internal combustion engine, by changing the position of the lever axis variable valve lift is achieved. Also in US 4,714,057 A, the US 4,724,822 A, US 4,986,227 A, US 4,638,773 A, US 4,397,270 A. or US 3,413,965 A, the valve lift is changed by changing the axis of rotation of the valve actuation lever.
- the disadvantage is that in the in most cases a relatively space-consuming and consisting of many parts Adjustment mechanism for the axis of rotation must be provided.
- the object of the present invention is to provide a simple as possible Space-saving variable valve train device consisting of a few individual parts to accomplish.
- an elastic transmission member is arranged in the effective path between the cam and the valve stem and that a adjustable stroke limiting element is provided against the opening force of the cam act on the valve tappet or the transmission link can, the stroke limiting element in at least one activation position the opening path of the globe valve with elastic change in shape of the transmission member limited to a predefined value.
- the elastic transmission link advantageously has one preferably formed by a compression spring second valve spring with a greater spring stiffness than the first valve spring on.
- the stroke limiting device can be used as a slide, as a single-arm or as a two-arm Lever be trained.
- an activation device preferably formed by an eccentric acts on the stroke limiting element in the sense of a stroke limitation.
- the stroke limiting element is preferably one has sleeve-shaped stop part, which in at least one activation position on the valve stem or on the transmission link the opening direction of the globe valve acts in the sense of a stroke limitation.
- Stroke limiting element has a damping body, which is preferably is arranged between the stop part and the slide or lever.
- the Damping body can preferably by at least one plate spring be educated.
- a hydraulic, pneumatic or electrical actuating device can be provided.
- the valve drive device 1 for at least one lift valve 2 of an internal combustion engine has a camshaft 3 with at least one cam 4, which via an elastic transmission member 5 to the valve stem 6 of the lift valve 2 acts in the opening direction against the closing force of a first valve spring 7.
- the transmission member 5 has one within two cup-like pistons 8, 9 second valve spring 20, which is designed as a compression spring and the two Pistons 8, 9 press apart.
- the first piston 8 is in a guide cylinder 10 of the cylinder housing 11, the second piston 9 within the first Piston 8 slidably mounted, the second piston 9 by a locking ring 12 is held within the first piston 8.
- a stroke limiting element is used to variably limit the valve stroke of the lift valve 2 13 is provided, which in the activated state in the exemplary embodiments acts on the second piston 9 against the opening movement. It is also conceivable that the stroke limiting element 13 directly on the Valve stem 6 acts.
- the stroke limiting element 13 has in the contact area with the elastic Transmission member 5 a stop part formed by a sleeve or the like 14, which in a recess 15 - for example a bore or a slot - the stroke limiting element 13 is arranged.
- the stop part 14 is designed as a hollow body or as a U-shaped body in cross section and at least partially includes the valve stem 6.
- On the transmission member facing side of the stroke limiting element 13 is between the stroke limiting element 13 and the stop part 14 one by two plate springs 16 formed damping part arranged. This damping part prevents too hard an impact of the stop member 14 on the second piston 9 of the transmission member 5th
- the stroke limiting element is 13 formed by a two-armed lever 13a which by one Axis 25 is pivotable and on which one formed by an eccentric 17 Actuating device 18 acts.
- Fig. 3 shows an embodiment variant, at which the stroke limiting element 13 is formed by a one-armed lever 13b is.
- the actuating device 18 is on the valve plate 2a of the lift valve 2 facing side of the stroke limiting element 13 is arranged.
- the Levers 13a, 13b must always be very rigid.
- Fig. 4 shows a third embodiment, in which the stroke limiting element 13 is also designed as a one-armed lever 13c.
- the eccentric 17 of the actuator 18 engages in a connecting rod eye 19 of the one-armed lever 13c on.
- valve drive device 1 shows the valve drive device 1 with the stroke limiting element deactivated 13.
- the eccentric 17 is in its rest position.
- the cam 4 of the camshaft 3 acts on the valve stem via the elastic transmission member 5 6 a. Since the second valve spring 20 has a much greater spring stiffness is designed as the first valve spring 7, is - with deactivated stroke limiting element 13 - the second valve spring 20 is not deflected, so that the by the cam 4 predetermined maximum valve lift unimpeded on the Lift valve 2 is transmitted.
- valve seat ring 27 is arranged, which with the valve plate 2a interacts.
- Fig. 2 shows the valve drive device 1 with activated stroke limiting element 13.
- the eccentric 17 is rotated into an activation position so that the lever 13a is deflected by a distance h e.
- the stop part 14 is thereby pressed in the direction of the transmission member 5.
- the cam 4 of the camshaft 3 simultaneously acts on the first piston 8 and displaces it by a distance h n . Since the second piston 9 is prevented from further deflection by the stop part 14 of the stroke limiting element 13, the second valve spring 20 is compressed and the stroke movement due to the cam 4 is at least partially absorbed by the transmission element 5.
- the actual valve stroke h v thus corresponds to the instantaneous cam stroke h n as long as this is smaller than the path h 0 -he / x, which is released by the stroke limiting element 13.
- valve lift h is plotted against the crank angle KW.
- the solid line 30 shows the valve lift when not activated Stroke limiting element 13.
- the course is with broken lines 31, 32, 33 the valve stroke h shown when stroke limiting element 13 moderate, medium or is heavily activated.
- FIG. 6 corresponds to that of FIG. 5 with the difference that with 30a and 30b the valve stroke h for a by turning the camshaft 3 effected adjustment of the phase position shown in the direction of the double arrow 34 is.
- the levels of lines 31, 32, and 33 are not changed.
- valve drive device 1 described enables very space-saving and Variable valve lift limitation in a simple manner with very few individual parts.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
- Fig. 1
- die erfindungsgemäße Ventiltriebeinrichtung im deaktivierten Zustand in einer ersten Ausführungsvariante;
- Fig. 2
- diese Ventiltriebeinrichtung im aktivierten Zustand bei geringfügig geöffnetem Hubventil;
- Fig. 3
- eine erfindungsgemäße Ventiltriebseinrichtung in einer zweiten Ausführungsvariante;
- Fig. 4
- eine erfindungsgemäße Ventiltriebseinrichtung in einer dritten Ausführungsvariante und
- Fig. 5 und 6
- Diagramme zur Erklärung der Wirkungsweise der Erfindung.
Claims (9)
- Ventiltriebseinrichtung (1) für zumindest ein Hubventil (2) für eine Brennkraftmaschine, wobei der Hubweg des Hubventils (2) variabel einstellbar ist, mit einer Nockenwelle (3) mit zumindest einem Nocken (4), welcher auf einen Ventilschaft (6) des Hubventiles (2) in Öffnungsrichtung entgegen einer vorzugsweise durch eine erste Ventilfeder (7) gebildeten Schließkraft einwirkt, dadurch gekennzeichnet, dass ein elastisches Übertragungsglied (5) im Wirkweg zwischen dem Nocken (4) und dem Ventilschaft (6) angeordnet ist und dass ein verstellbares Hubbegrenzungselement (13) vorgesehen ist, welches entgegen der Öffnungskraft des Nockens (4) auf den Ventilstößel (6) oder das Übertragungsglied (5) einwirken kann, wobei in zumindest einer Aktivierungsposition das Hubbegrenzungselement (13) den Öffnungsweg des Hubventiles (2) unter elastischer Formänderung des Übertragungsgliedes (5) auf einen vordefinierten Wert begrenzt.
- Ventiltriebseinrichtung (1) nach Anspruch 1, dadurch gekennzeichnet, dass das Übertragungsglied eine, vorzugsweise durch eine Druckfeder gebildete, zweite Ventilfeder (20) aufweist, welche eine größere Federsteifigkeit aufweist als die erste Ventilfeder (7).
- Ventiltriebseinrichtung (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Hubbegrenzungselement (13) als Schieber ausgebildet ist.
- Ventiltriebseinrichtung (1) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Hubbegrenzungselement (13) als einarmiger- oder zweiarmiger Hebel (13a, 13b) ausgebildet ist.
- Ventiltriebseinrichtung (1) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass eine vorzugsweise durch einen Exzenter (18) gebildete Aktivierungseinrichtung (17) auf das Hubbegrenzungselement (13) im Sinne einer Hubbegrenzung einwirkt.
- Ventiltriebseinrichtung (1) nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Hubbegrenzungselement (13) einen vorzugsweise hülsenförmigen Anschlagteil (14) aufweist, welcher in zumindest einer Aktivierungsposition auf den Ventilschaft (6) oder auf das Übertragungsglied (5) entgegen der Öffnungsrichtung des Hubventiles (2) im Sinne einer Hubbegrenzung einwirkt.
- Ventiltriebseinrichtung (1) nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass das Hubbegrenzungselement (13) einen Dämpfungskörper aufweist, welcher vorzugsweise zwischen dem Anschlagteil (17) und dem Schieber (13a, 13b) oder Hebel angeordnet ist.
- Ventiltriebseinrichtung (1) nach Anspruch 7, dadurch gekennzeichnet, dass der Dämpfungskörper durch mindestens eine Tellerfeder (16) gebildet ist.
- Ventiltriebseinrichtung (1) nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass zusätzlich eine Einrichtung zur Verstellung der Ventilöffnungszeiten vorgesehen ist, die vorzugsweise als Einrichtung zur Phasenverstellung der Nockenwelle (3) ausgebildet ist.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20020450157 EP1380728B1 (de) | 2002-07-12 | 2002-07-12 | Ventiltriebseinrichtung |
DE50202718T DE50202718D1 (de) | 2002-07-12 | 2002-07-12 | Ventiltriebseinrichtung |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20020450157 EP1380728B1 (de) | 2002-07-12 | 2002-07-12 | Ventiltriebseinrichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1380728A1 true EP1380728A1 (de) | 2004-01-14 |
EP1380728B1 EP1380728B1 (de) | 2005-04-06 |
Family
ID=29724622
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20020450157 Expired - Lifetime EP1380728B1 (de) | 2002-07-12 | 2002-07-12 | Ventiltriebseinrichtung |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1380728B1 (de) |
DE (1) | DE50202718D1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006018588A1 (de) * | 2006-04-21 | 2007-10-25 | Schaeffler Kg | Ventilbetätigungseinrichtung, insbesondere für Gaswechselventile von Hubkolbenbrennkraftmaschinen |
GB2566489A (en) * | 2017-09-15 | 2019-03-20 | Camcon Auto Ltd | Actuation assembly and methods of operation thereof |
CN109854323A (zh) * | 2019-03-12 | 2019-06-07 | 北方工业大学 | 低功耗响应迅速的活塞发动机气门装置 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012009621B4 (de) * | 2012-05-15 | 2023-06-29 | Neumayer Tekfor Engineering Gmbh | Ventilbetätigungsvorrichtung für einen Verbrennungsmotor |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3413965A (en) | 1967-07-13 | 1968-12-03 | Ford Motor Co | Mechanism for varying the operation of a reciprocating member |
US4397270A (en) | 1979-04-13 | 1983-08-09 | Nissan Motor Co., Ltd. | Valve operating mechanism for internal combustion engines |
JPS60162004A (ja) * | 1984-01-31 | 1985-08-23 | Mitsubishi Motors Corp | 弁作動停止装置付きエンジン動弁機構 |
US4638773A (en) | 1986-02-28 | 1987-01-27 | General Motors Corporation | Variable valve lift/timing mechanism |
US4714057A (en) | 1985-05-30 | 1987-12-22 | Dr. Ing. H.C.F. Porsche Aktiengesellschaft | Variable valve control system for a piston internal-combustion engine |
US4724822A (en) | 1986-02-28 | 1988-02-16 | General Motors Corporation | Variable valve lift/timing mechanism |
US4986227A (en) | 1990-05-08 | 1991-01-22 | Dewey Iii Albert B | Variable lift valve train |
FR2676501A1 (fr) * | 1991-05-15 | 1992-11-20 | Peugeot | Dispositif d'actionnement d'une soupape pour en faire varier la levee et/ou le calage. |
US5365895A (en) | 1991-12-03 | 1994-11-22 | Motive Holdings Limited | Variable valve lift mechanism for internal combustion engine |
US20010013325A1 (en) * | 2000-02-10 | 2001-08-16 | Gianluigi Buglioni | Valves for i.c. engines with variable lifts and timings |
US6293239B1 (en) * | 1997-03-26 | 2001-09-25 | Daimlerchrysler Ag | Valve gear for gas exchange valves of internal combustion engines |
-
2002
- 2002-07-12 EP EP20020450157 patent/EP1380728B1/de not_active Expired - Lifetime
- 2002-07-12 DE DE50202718T patent/DE50202718D1/de not_active Expired - Lifetime
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3413965A (en) | 1967-07-13 | 1968-12-03 | Ford Motor Co | Mechanism for varying the operation of a reciprocating member |
US4397270A (en) | 1979-04-13 | 1983-08-09 | Nissan Motor Co., Ltd. | Valve operating mechanism for internal combustion engines |
JPS60162004A (ja) * | 1984-01-31 | 1985-08-23 | Mitsubishi Motors Corp | 弁作動停止装置付きエンジン動弁機構 |
US4714057A (en) | 1985-05-30 | 1987-12-22 | Dr. Ing. H.C.F. Porsche Aktiengesellschaft | Variable valve control system for a piston internal-combustion engine |
US4638773A (en) | 1986-02-28 | 1987-01-27 | General Motors Corporation | Variable valve lift/timing mechanism |
US4724822A (en) | 1986-02-28 | 1988-02-16 | General Motors Corporation | Variable valve lift/timing mechanism |
US4986227A (en) | 1990-05-08 | 1991-01-22 | Dewey Iii Albert B | Variable lift valve train |
FR2676501A1 (fr) * | 1991-05-15 | 1992-11-20 | Peugeot | Dispositif d'actionnement d'une soupape pour en faire varier la levee et/ou le calage. |
US5365895A (en) | 1991-12-03 | 1994-11-22 | Motive Holdings Limited | Variable valve lift mechanism for internal combustion engine |
US6293239B1 (en) * | 1997-03-26 | 2001-09-25 | Daimlerchrysler Ag | Valve gear for gas exchange valves of internal combustion engines |
US20010013325A1 (en) * | 2000-02-10 | 2001-08-16 | Gianluigi Buglioni | Valves for i.c. engines with variable lifts and timings |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 009, no. 330 (M - 442) 25 December 1985 (1985-12-25) * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006018588A1 (de) * | 2006-04-21 | 2007-10-25 | Schaeffler Kg | Ventilbetätigungseinrichtung, insbesondere für Gaswechselventile von Hubkolbenbrennkraftmaschinen |
GB2566489A (en) * | 2017-09-15 | 2019-03-20 | Camcon Auto Ltd | Actuation assembly and methods of operation thereof |
CN109854323A (zh) * | 2019-03-12 | 2019-06-07 | 北方工业大学 | 低功耗响应迅速的活塞发动机气门装置 |
Also Published As
Publication number | Publication date |
---|---|
DE50202718D1 (de) | 2005-05-12 |
EP1380728B1 (de) | 2005-04-06 |
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