EP1260681B1 - Stössel für einen Ventiltrieb - Google Patents
Stössel für einen Ventiltrieb Download PDFInfo
- Publication number
- EP1260681B1 EP1260681B1 EP02009906A EP02009906A EP1260681B1 EP 1260681 B1 EP1260681 B1 EP 1260681B1 EP 02009906 A EP02009906 A EP 02009906A EP 02009906 A EP02009906 A EP 02009906A EP 1260681 B1 EP1260681 B1 EP 1260681B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bottom part
- cam
- tappet
- inner bottom
- cams
- 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
- 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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
- F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
- F01L1/245—Hydraulic tappets
- F01L1/25—Hydraulic tappets between cam and valve stem
-
- 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
-
- 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
- F01L2307/00—Preventing the rotation of tappets
Definitions
- the present invention relates in particular to a tappet for a valve train an internal combustion engine.
- the present invention relates in particular switchable tappets, as used in valve drives for the purpose of cylinder, Valve or stroke switching or combinations thereof can be used.
- EP 0 857 860 A1 describes a tappet for a valve train according to the features the preamble of claim 1 known.
- the disadvantage here is that the rectangular recess in the outer bottom part to accommodate the inner bottom part only with increased manufacturing effort can be formed.
- the rectangular recess holes are provided on the narrow sides to prevent stress cracks avoid.
- the task is therefore to simplify the manufacture of the plunger.
- the circular recess in the outer bottom part can be manufactured easy and precise manufacture. Additional holes to avoid There are no tension cracks.
- the interaction of the circular recess with the circumferential arc sections of the inner bottom part allows given the diameter of the recess, the greatest possible extent of the inner bottom part for optimal emigration of the inner Cam.
- the cam contact surface for the outer cams protrudes somewhat into the circular one Recess into it, however, the one for the loading by the External cam provided annular surface of the outer bottom part is sufficiently large, as explained in more detail below.
- the inner part is rotatably received in the outer part.
- the rectangular recess must be exactly aligned to other torsion-proof surfaces in order to There is no need to exclude tilting or jamming of the inner part this exact alignment in the tappet according to the invention because of rotationally symmetrical circular recess.
- the inner base part can be clearly in its Diameters are increased to a correspondingly increased emigration to allow the cam contact line on the inner bottom part. Emigration also remains due to the flattening provided according to the invention the cam contact line on the outer bottom part. On in this way, on the one hand, there are large cam lifts by means of the external cams An enlarged cam stroke by means of the inner cam is also possible possible.
- the inner base part can have a circular outer contour in a known manner have, but then with the opposing flats is provided. These flattenings can be done in a simple way Key surfaces be formed.
- Another advantage of the invention is that a reduction in Cam width of the outer cams is not required, which disadvantageously increases Hertzian pressures with maximum emigration of the cam contact would lead.
- a ratio of the outer diameter of the inner bottom part to the outer diameter of the outer bottom part between 0.4 and 0.7, but preferably between 0.5 and 0.6 possible.
- this quotient shows the advantages of the tappet according to the invention clear: on the one hand, there is an undesirable increase in the mass of the ram overall avoided. On the other hand, significantly larger internal strokes can be carried out without restricting the outside stroke. Furthermore, the Hertzian pressures with maximum emigration not or only insignificantly elevated.
- an outer part can be the outer bottom part and an inner part have the inner bottom part, in a known manner a locking device for releasably locking the outer part with the inner part is provided.
- a locking device is, for example, from known from DE 196 52 180 A1.
- the inner part and outer part are unlocked.
- the two outer cams can the cam stroke of the entire tappet Taxes.
- a particularly space-saving tappet according to the invention provides that the Locking device comprises a locking pin or locking piston that runs along an axis is displaceable, which is arranged parallel to the flats. If this tappet according to the invention is arranged in the valve train, it is accordingly the locking pin or the locking piston transverse to the axis of rotation of the camshafts arranged.
- the tappet according to the invention has a base 1, which consists of an annular outer bottom part 2 and a circular inner bottom part 3 is formed.
- the inner circular bottom part 3 is coaxial in the annular outer bottom part 2 arranged.
- the two bottom parts 2, 3 are slidable relative to each other, the outer bottom part 2 of two not outer cam shown and wherein the inner bottom part 3 of an between the outer cam arranged - also not shown - inner cam is acted upon.
- the inner bottom part 3 has on its circumference two opposite key surface 4. These key areas 4 serve to exempt the outer cams, not shown. dashed the cam contact surface 5 is shown on the outer base part 2 and the cam contact surface 6 on the inner bottom part 3.
- the ratio of the diameter D i of the inner bottom part 3 to the outer diameter D a of the outer bottom part 2 is dimensioned such that a quotient is set which is between 0.5 and 0.6. With this diameter ratio, an optimal migration of the cam contact line on the inner base part is guaranteed. On the other hand, it is ensured that the width of the outer cam is not reduced despite the increased stroke on the inner base part 3.
- the locking device 9 includes u. a. a locking piston 10 along an axis is displaceable, which is arranged parallel to the key surfaces 4.
- the inner part 7 acts via a play compensation element (not explained in more detail) 11 together with at least one gas exchange valve of the internal combustion engine.
- the outer part 8 works against a so-called lost motion spring 12.
- the inner part 7 is in a circular recess 15 or bore of the Outer part 8 taken up against rotation. Between the two key surfaces 4 of the inner bottom part 3 extend on the circumference of circular arc sections 13, which is coaxial with the circular recess 15 and with little radial play to the boundary of the circular recess 15 Inner wall 14 of the outer bottom part 2 are arranged. This training of the inner bottom part enables a large extension of the cam contact area 6 for a large emigration of the inner cam.
- the outer part 8 of the plunger has two diametrically opposite one another Place the outer base part 2 on base 17.
- the locking piston 10 is slidably received in base holes 18. These bases are advantageous if the locking plunger is not further below the plunger surface due to installation can be arranged.
- the cam contact surfaces 5, 6 of the bottom parts 2, 3 in a plane of curvature parallel to the camshaft is convexly curved.
- the cam contact surfaces are parallel to the camshaft axis in the viewing direction 5, 6 convexly curved.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
Description
- Figur 1
- eine perspektivische Darstellung eines erfindungsgemäßen Stößel und
- Figur 2
- einen Schnitt durch den Stößel aus Figur 1.
- 1
- Boden
- 2
- äußeres Bodenteil
- 3
- inneres Bodenteil
- 4
- Schlüsselfläche
- 5
- Nockenkontaktfläche
- 6
- Nockenkontaktfläche
- 7
- Innenteil
- 8
- Außenteil
- 9
- Arretiereinrichtung
- 10
- Arretierkolben
- 11
- hydraulisches Spielausgleichselement
- 12
- Lost-motion-Feder
- 13
- Kreisbogenabschnitt
- 14
- Innenwandung
- 15
- kreisförmige Ausnehmung
- 16 17
- Sockel
- 18
- Sockelbohrung
Claims (7)
- Stößel für einen Ventiltrieb insbesondere einer Verbrennungskraftmaschine, dessen Außenteil (8) einen äußeren Bodenteil (2) aufweist und ein mit einem inneren Bodenteil (3) versehenes zylindrisches Innenteil (7) umgibt, wobei das Außenteil (8) und das Innenteil (7) in Betätigungsrichtung des Stößels relativ zueinander verschiebbar sind, und wobei das äußere Bodenteil (2) von zwei Außennocken und wobei der innere Bodenteil (3) von einem zwischen den Außennocken angeordneten Innennocken beaufschlagbar ist, und wobei der mit einer kreisförmigen Kontur versehene innere Bodenteil (3) an seinem Umfang zwei einander gegenüberliegende Abflachungen (4) zur Freistellung der Außennocken aufweist, wobei zwischen den Abflachungen (4) umfangsseitig Kreisbogenabschnitte (13) an dem inneren Bodenteil (3) ausgebildet sind dadurch gekennzeichnet, daß der äußere Bodenteil (2) mit einer Innenwandung (14) eine kreisförmige Ausnehmung (15) begrenzt, die geeignet ist eine Nockenkontaktlinie der Außennocken zu schneiden, wobei der innere Bodenteil (3) in der kreisförmigen Ausnehmung (15) angeordnet ist, und wobei die umfangsseitigen Kreisbogenabschnitte (13) des inneren Bodenteils (3) mit geringem radialen Abstand und koaxial zur Innenwandung (14) angeordnet ist.
- Stößel nach Anspruch 1, bei dem das Verhältnis des Außendurchmessers des inneren Bodenteils (3) zum Außendurchmesser des äußeren Bodenteils (2) mindestens 0,4 beträgt.
- Stößel nach Anspruch 1, bei dem das Verhältnis des Außendurchmessers des inneren Bodenteils (3) zum Außendurchmesser des äußeren Bodenteils (2) zwischen 0,4 und 0,7, vorzugsweise jedoch zwischen 0,5 und 0,6 liegt.
- Stößel nach Anspruch 1, bei dem eine Arretiereinrichtung (9) zum lösbaren Arretieren des Außenteils (8) mit dem Innenteil (7) vorgesehen ist.
- Stößel nach Anspruch 4, bei dem die Arretiereinrichtung (9) einen Arretierstift oder Arretierkolben (10) umfaßt, der entlang einer Achse verschiebbar ist, die parallel zu den Abflachungen (4) angeordnet ist.
- Stößel nach Anspruch 5 bei dem das äußere Bodenteil (2) des Außenteils (8) zwei diametral einander gegenüberliegende Sockel (7) aufweist, in deren Sockelbohrung (18) der Arretierkolben (10) verschiebbar aufgenommen ist.
- Stößel nach Anspruch 1, bei dem die Nockenkontaktfläche (5, 6) des inneren Bodenteils (7) und des äußeren Bodenteils (8) in einer zur Nockenwellenachse parallelen Krümmungsebene konvex gekrümmt sind.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10123963A DE10123963A1 (de) | 2001-05-17 | 2001-05-17 | Stößel für einen Ventiltrieb |
DE10123963 | 2001-05-17 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1260681A2 EP1260681A2 (de) | 2002-11-27 |
EP1260681A3 EP1260681A3 (de) | 2003-01-08 |
EP1260681B1 true EP1260681B1 (de) | 2004-03-03 |
Family
ID=7685090
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02009906A Expired - Lifetime EP1260681B1 (de) | 2001-05-17 | 2002-05-03 | Stössel für einen Ventiltrieb |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1260681B1 (de) |
JP (1) | JP2002349213A (de) |
AT (1) | ATE261055T1 (de) |
DE (2) | DE10123963A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006002757A1 (en) * | 2004-07-01 | 2006-01-12 | Schaeffler Kg | Switchable cam follower |
DE102004056457A1 (de) * | 2004-11-23 | 2006-06-08 | Schaeffler Kg | Tassenstößel für eine Brennkraftmaschine |
DE102005017409A1 (de) * | 2005-04-15 | 2006-10-19 | Schaeffler Kg | Außenteil eines schaltbaren Tassenstößels |
DE102005049774A1 (de) * | 2005-10-18 | 2007-04-19 | Robert Bosch Gmbh | Vorrichtung zum Betätigen eines Gaswechselventils einer Brennkraftmaschine |
DE102017109017A1 (de) | 2017-04-27 | 2018-10-31 | Schaeffler Technologies AG & Co. KG | Verbrennungskolbenmotor und Verfahren zur Steuerung des Ansaugluftvolumenstroms eines Verbrennungskolbenmotors |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3826365A1 (de) * | 1988-08-03 | 1990-02-15 | Bayerische Motoren Werke Ag | Ventilsteuerung fuer brennkraftmaschinen |
US5287830A (en) * | 1990-02-16 | 1994-02-22 | Group Lotus | Valve control means |
DE4213856C2 (de) * | 1992-04-27 | 1994-08-04 | Iav Motor Gmbh | Ventiltrieb für Ladungswechselventile, von Hubkolbenbrennkraftmaschinen |
DE4244287C2 (de) * | 1992-04-27 | 2001-12-13 | Iav Motor Gmbh | Ventiltrieb für Ladungswechselventile, vorzugsweise Einlaßventile von Hubkolbenbrennkraftmaschinen |
WO1993022543A1 (de) * | 1992-04-27 | 1993-11-11 | Iav - Motor Gmbh | Ventiltrieb für ladungswechselventile, vorzugsweise einlassventile von hubkolbenbrennkraftmaschinen |
US5361733A (en) * | 1993-01-28 | 1994-11-08 | General Motors Corporation | Compact valve lifters |
DE4314619A1 (de) * | 1993-05-04 | 1994-11-10 | Schaeffler Waelzlager Kg | Stößel |
DE4337330C2 (de) * | 1993-11-02 | 1996-03-21 | Iav Motor Gmbh | Rollenstößel mit zwei Rollen je Ventil für Ventiltriebe von Verbrennungsmotoren mit oben liegender Nockenwelle |
JP3310490B2 (ja) * | 1994-10-27 | 2002-08-05 | 株式会社ユニシアジェックス | 内燃機関の動弁装置 |
DE19502332A1 (de) * | 1995-01-26 | 1996-08-01 | Schaeffler Waelzlager Kg | Vorrichtung und Verfahren zum Betrieb eines Ventiltriebs einer Brennkraftmaschine |
DE19652180A1 (de) * | 1996-12-14 | 1998-06-18 | Schaeffler Waelzlager Ohg | Stößel für einen Ventiltrieb einer Brennkraftmaschine |
US5709180A (en) * | 1997-02-06 | 1998-01-20 | General Motors Corporation | Narrow cam two-step lifter |
-
2001
- 2001-05-17 DE DE10123963A patent/DE10123963A1/de not_active Withdrawn
-
2002
- 2002-05-03 DE DE50200267T patent/DE50200267D1/de not_active Expired - Fee Related
- 2002-05-03 EP EP02009906A patent/EP1260681B1/de not_active Expired - Lifetime
- 2002-05-03 AT AT02009906T patent/ATE261055T1/de not_active IP Right Cessation
- 2002-05-16 JP JP2002141319A patent/JP2002349213A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
DE50200267D1 (de) | 2004-04-08 |
JP2002349213A (ja) | 2002-12-04 |
EP1260681A3 (de) | 2003-01-08 |
EP1260681A2 (de) | 2002-11-27 |
ATE261055T1 (de) | 2004-03-15 |
DE10123963A1 (de) | 2002-11-21 |
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