EP0627043A1 - Ventilbetätigungsmechanismus für eine brennkraftmaschine. - Google Patents
Ventilbetätigungsmechanismus für eine brennkraftmaschine.Info
- Publication number
- EP0627043A1 EP0627043A1 EP93903913A EP93903913A EP0627043A1 EP 0627043 A1 EP0627043 A1 EP 0627043A1 EP 93903913 A EP93903913 A EP 93903913A EP 93903913 A EP93903913 A EP 93903913A EP 0627043 A1 EP0627043 A1 EP 0627043A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rocker arms
- actuation mechanism
- bores
- valve actuation
- mechanism according
- 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
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
- F01L1/26—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
- F01L1/265—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 peculiar to machines or engines with three or more intake 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
- 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
- F01L1/267—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 with means for varying the timing or the lift of the 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
- F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
Definitions
- the invention relates to a valve actuation mechanism for an internal combustion engine according to the preamble of claim 1.
- Such a valve actuation mechanism is known for example from JP 60-216014.
- the object of the invention is to provide a valve actuation mechanism of the generic type with which the stroke, the opening duration and / or the control times of the three inlet valves can be easily adapted to the requirements for different speed ranges of the internal combustion engine.
- All three intake valves are then active in the medium speed range, with torque advance being achieved by advancing the timing "intake opens” and an internal exhaust gas recirculation taking place due to the overlap between "intake opens” and “exhaust closed”, which helps to reduce the formation of nitrogen oxides.
- the first rocker arms are coupled to the second rocker arms, so that the valves can now be operated in accordance with the cam contour of the cams acting on the second rocker arms with a long stroke, long opening time, early start of intake and late intake, which results in high performance is achieved.
- each first drag lever and the valve actuated by the latter are preferably in a common plane. This prevents a tilting moment from being exerted on the rocker arms in every operating state, thus preventing the rocker arms from tilting and reducing wear between the rocker arms and cams.
- the two second rocker arms since they are actuated by identical cams, can be rigidly connected to one another or also be in one piece. They are preferably pivotally mounted on the common axis of the first rocker arm.
- valve axes of the inlet valves intersect the axis of rotation of the camshaft or cross at a short distance.
- This arrangement has the advantage that one and the same cylinder head is optional with actuation of the intake valves from the cams of the camshaft can be carried out directly via tappets if no variable valve control is desired, or with actuation of the intake valves via cam followers according to the proposal of the present invention, since the position of the camshaft is the same in both cases .
- Claim 8 describes a simple possibility for the coupling of the first rocker arm to the second rocker arm, whereby, in contrast to a known embodiment for the actuation of two inlet valves (DE-OS 38 00 347), coupling parts do not slide on one another in the uncoupled Condition occurs.
- FIG. 1 shows a valve train with a valve actuation mechanism according to the invention for three intake valves in vertical section along line 1-1 in FIG. 2,
- FIG. 2 is a view in the direction of arrow 2 in FIG. 1,
- FIG. 3 is a top plan view of the valve actuation mechanism of FIGS. 1 and 2, partially in section;
- Fig. 4 shows a section along line 4-4 in Fig. 5 one
- Valve train with a valve actuation mechanism according to a second embodiment, 5 shows a section along line 5-5 in FIG. 4,
- FIG. 6 shows a section along line 6-6 in FIG. 5, the shift drum being shown in a first position
- Fig. 8 is a section along line 8-8 in Fig. 5, and
- FIG. 9 shows a modification of the exemplary embodiment according to FIGS. 4 to 8 in a section corresponding to FIG. 6.
- valve train for three intake valves E is shown. Each valve E is acted upon by a spring 1 in the closing direction.
- the valves are actuated by their own cams 2, 3 and 4 of a camshaft 5 via rocker arms 6, which are pivotally mounted on a common fixed axis 7.
- the cams 2, 3 and 4 preferably have different cam profiles in order to achieve a different valve lift, a different opening duration and / or different control times for the individual intake valves and to create optimal conditions in the lower and middle speed range of the internal combustion engine.
- second cams 8 with an identical cam profile are provided on the camshaft 5, which cam is designed for the conditions in the upper speed range of the internal combustion engine, that is, for example, it produces a larger valve lift and a longer opening time.
- Rocker arms 9 cooperate with the second cams 8 and can be coupled to the first rocker arms 6 in the upper speed range, so that in this speed range the valves E are actuated in accordance with the contour of the cams 8.
- the free ends of the second rocker arms 9 are connected to one another by a cross member 10 which runs in front of and at a short distance from the free ends of the first rocker arms 6.
- radial bores 11 are provided with respect to the axis of rotation 7, which are aligned with corresponding bores 12 in the cross member 10 when the valves E are closed, that is to say when all rocker arms 6 and 9 are at the base circles of their cams 2 , 3, 4 or 8 are present.
- a piston 13 is arranged in each bore 11 and is pushed outwards by a pressure medium which is supplied through a channel 14 in the axis 7 and engages in the bore 12 in the cross member 10, as a result of which the drag lever 6 and 9 are coupled together.
- Each piston 13 is under the action of a spring 15, which is supported on the one hand on an insert 16 fixed in the bore 11 and on the other hand on the end of a sleeve 17 which is fastened to the piston 13 and extends through the insert 16.
- the spring 15 guides the piston 13 back into its decoupled position, the insert 16 serving as a stop.
- a second oil channel 18 is provided in the axis 7 and is connected to the bearing points of the rocker arms 6, 9 by bores 19.
- Each rocker arm 6, 9 has a sliding surface 20 with which it rests on its cam 2, 3, 4 and 8, respectively.
- the second rocker arms 9 are held in contact with their cams 8 by spring elements (not shown).
- the arrangement is such that the valve axes 21 of the intake valves E intersect or intersect the rotary axis D of the camshaft at a small distance, as is the case in EP 262 250 for a valve control - with direct valve actuation, i.e. without rocker arm or rocker arm, has been proposed.
- a valve train in which the valves are actuated by rocker arms it is possible to equip an internal combustion engine with a variable valve control according to the present invention or with direct actuation of the valves via bucket tappets without changing the position of the camshaft .
- 1 also shows that the longitudinal center axis 6a of each rocker arm 6 and the longitudinal center axis 21 of the valve E actuated by it lie in a common plane, thereby avoiding that tilting moments act on the rocker arm.
- first and second rocker arms 6 and 9 have bores 22 and 23 which run parallel to their axis of rotation 7 and which are coaxial when the valves are closed run.
- a rotatable shift drum 24 extends through all the bores and is rotatably mounted in the bores 23 of the second rocker arms 9 and has cutouts 25 in the area of the bores 22 in the first rocker arms 6.
- the bores 22 in the rocker arms 6 are, as can be seen from FIGS.
- an eccentric extension 28 is provided at each end, which engages in a longitudinal slot 29 of a ring 30 which is rotatably mounted on the axis of rotation 7 of the rocker arms.
- the two rings 30 are connected to one another by a web 31.
- the second rocker arms 9 are, as can be seen in particular from FIG.
- the first rocker arms 6 are held in the usual way by the valve springs 1 in contact with their cams 2, 3 and 4.
- the second rocker arms 9 are provided with rearward-looking extensions 38 which partially encompass a spark plug dome 39.
- a spring 40 is arranged on the spark plug dome is supported on the one hand on a stationary spring plate 41 and on the other hand on a displaceable spring plate 42 which cooperates with the extensions 38 of the second rocker arms 9.
- FIG. 9 differs from that of FIGS. 4 to 8 essentially only in that only the second rocker arms 9 are mounted on the fixed axis 7, while the first rocker arms 6 are mounted on an axis 40 which is parallel to Axis 7 runs and is mounted in the second rocker arms 9. Coupling and uncoupling of the first rocker arms 6 with or from the second rocker arms 9 takes place, as in the exemplary embodiment according to FIGS. 4 to 8, by means of a shift drum 24 which, in the position shown, which corresponds to the position according to FIG. 6, pivots the second The rocker arm 9 enables the first rocker arm 6 to be carried along and, when rotated to the position shown in FIG.
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4205230 | 1992-02-21 | ||
DE4205230A DE4205230A1 (de) | 1992-02-21 | 1992-02-21 | Ventilbetaetigungsmechanismus fuer eine brennkraftmaschine |
PCT/EP1993/000276 WO1993017227A1 (de) | 1992-02-21 | 1993-02-05 | Ventilbetätigungsmechanismus für eine brennkraftmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0627043A1 true EP0627043A1 (de) | 1994-12-07 |
EP0627043B1 EP0627043B1 (de) | 1996-04-17 |
Family
ID=6452206
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93903913A Expired - Lifetime EP0627043B1 (de) | 1992-02-21 | 1993-02-05 | Ventilbetätigungsmechanismus für eine brennkraftmaschine |
Country Status (5)
Country | Link |
---|---|
US (1) | US5495831A (de) |
EP (1) | EP0627043B1 (de) |
JP (1) | JPH07504247A (de) |
DE (2) | DE4205230A1 (de) |
WO (1) | WO1993017227A1 (de) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4232848A1 (de) * | 1992-09-30 | 1994-03-31 | Audi Ag | Ventilbetätigungsmechanismus |
DE4309609C2 (de) * | 1993-03-24 | 1995-08-24 | Audi Ag | Ventilbetätigungsmechanismus für eine Brennkraftmaschine |
DE4316860C1 (de) * | 1993-05-19 | 1994-05-26 | Audi Ag | Ventilbetätigungsmechanismus für eine Brennkraftmaschine |
DE4317638C1 (de) * | 1993-05-27 | 1994-08-18 | Audi Ag | Ventilbetätigungsvorrichtung für eine Mehrzylinder-Brennkraftmaschine |
DE4327943A1 (de) * | 1993-08-19 | 1995-02-23 | Audi Ag | Ventilsteuerung für eine Brennkraftmaschine |
DE4332198A1 (de) * | 1993-09-22 | 1995-03-23 | Porsche Ag | Brennkraftmaschine |
DE4334995C2 (de) * | 1993-10-14 | 1996-01-11 | Audi Ag | Ventiltrieb für eine Mehrzylinder-Brennkraftmaschine |
DE4337642C1 (de) * | 1993-11-04 | 1995-02-09 | Audi Ag | Ventilbetätigungsvorrichtung für eine Brennkraftmaschine |
DE4339945C1 (de) * | 1993-11-24 | 1995-06-08 | Audi Ag | Ventiltrieb für eine Brennkraftmaschine |
JPH08158832A (ja) * | 1994-11-30 | 1996-06-18 | Aisin Seiki Co Ltd | エンジンの動弁装置 |
JP3319896B2 (ja) * | 1994-12-21 | 2002-09-03 | 株式会社ユニシアジェックス | エンジンの弁作動装置 |
DE19519601C2 (de) * | 1995-05-29 | 1997-04-03 | Daimler Benz Ag | Ventilantriebssytem für eine mehrzylindrige Brennkraftmaschine |
DE19536090A1 (de) * | 1995-09-28 | 1997-04-03 | Schaeffler Waelzlager Kg | Brennkraftmaschine mit einem Hebeltrieb zur gleichzeitigen Beaufschlagung von zumindest zwei Gaswechselventilen |
US5908015A (en) * | 1996-07-06 | 1999-06-01 | Meta Motoren- Und Energie Technik Gmbh | Arrangement for interrupting the flow of force between a camshaft and a valve |
DE19643711A1 (de) * | 1996-10-23 | 1998-04-30 | Audi Ag | Ventilbetätigungsvorrichtung für eine Brennkraftmaschine |
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 |
EP0979929B1 (de) * | 1998-08-11 | 2004-12-15 | Wenko AG Burgdorf | Hubkolbenmotor mit Kipphebel-Ventilsteuerung |
DE102004005594A1 (de) * | 2004-02-04 | 2005-08-25 | Fev Motorentechnik Gmbh | Schlepphebel zur Hubumschaltung |
CN106948897A (zh) * | 2017-02-20 | 2017-07-14 | 浙江大学 | 一种可变气门数的发动机配气机构 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU1158772A1 (ru) * | 1982-12-29 | 1985-05-30 | Коломенский Филиал Всесоюзного Заочного Политехнического Института | Устройство дл управлени клапаном газораспределени двигател внутреннего сгорани |
JPS60216014A (ja) * | 1984-04-11 | 1985-10-29 | Yamaha Motor Co Ltd | 内燃機関の動弁装置 |
IT1186360B (it) * | 1985-11-04 | 1987-11-26 | Alfieri Maserati Spa Off | Motore a combustione interna ad elevate prestazioni |
US4724822A (en) * | 1986-02-28 | 1988-02-16 | General Motors Corporation | Variable valve lift/timing mechanism |
JPH036801Y2 (de) * | 1986-11-18 | 1991-02-20 | ||
GB2199894B (en) * | 1987-01-08 | 1990-10-24 | Honda Motor Co Ltd | Valve operating device in internal combustion engine |
US4762096A (en) * | 1987-09-16 | 1988-08-09 | Eaton Corporation | Engine valve control mechanism |
JPH01285611A (ja) * | 1988-05-10 | 1989-11-16 | Honda Motor Co Ltd | 内燃機関の弁作動状態切換装置 |
JP2786699B2 (ja) * | 1989-11-29 | 1998-08-13 | ヤマハ発動機株式会社 | Sohcエンジンの動弁装置 |
JP2849939B2 (ja) * | 1990-05-07 | 1999-01-27 | 本田技研工業株式会社 | Sohc型内燃機関 |
-
1992
- 1992-02-21 DE DE4205230A patent/DE4205230A1/de not_active Withdrawn
-
1993
- 1993-02-05 DE DE59302274T patent/DE59302274D1/de not_active Expired - Lifetime
- 1993-02-05 WO PCT/EP1993/000276 patent/WO1993017227A1/de active IP Right Grant
- 1993-02-05 EP EP93903913A patent/EP0627043B1/de not_active Expired - Lifetime
- 1993-02-05 US US08/290,893 patent/US5495831A/en not_active Expired - Fee Related
- 1993-02-05 JP JP5514488A patent/JPH07504247A/ja active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO9317227A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE59302274D1 (de) | 1996-05-23 |
US5495831A (en) | 1996-03-05 |
EP0627043B1 (de) | 1996-04-17 |
JPH07504247A (ja) | 1995-05-11 |
DE4205230A1 (de) | 1993-08-26 |
WO1993017227A1 (de) | 1993-09-02 |
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