EP0717173B1 - Stössel für ein schaltbares Ventil einer Brennkraftmaschine - Google Patents
Stössel für ein schaltbares Ventil einer Brennkraftmaschine Download PDFInfo
- Publication number
- EP0717173B1 EP0717173B1 EP95115828A EP95115828A EP0717173B1 EP 0717173 B1 EP0717173 B1 EP 0717173B1 EP 95115828 A EP95115828 A EP 95115828A EP 95115828 A EP95115828 A EP 95115828A EP 0717173 B1 EP0717173 B1 EP 0717173B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coupling member
- locking device
- tappet
- valve stem
- valve
- 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
- F01L13/0005—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
- 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
Definitions
- the invention relates to a tappet for a switchable valve according to the preamble of claim 1.
- Such a tappet is known from DE-A-29 52 037.
- the one in it Plunger described for a switchable valve of an internal combustion engine a coupling member through which the valve in a first switching position switched off and in a second switching position for gas exchange control is activated.
- the coupling member is slidable in the plunger and as hydraulically actuated piston.
- This coupling link is in two the switching positions of the plunger assigned end positions by a Locking device lockable, each in a recess on the coupling member intervenes.
- This locking device consists, for example, of a spring-loaded ball or a hydraulically actuated piston.
- the coupling member By Pressurization of the coupling member acting as a piston becomes this Locking devices overpressed or released, so that there is a possibility that when lifting the valve and pressurized piston between the valve stem and bore in the coupling member no clear location is determined, what about this can lead to the valve stem under high wear-prone friction this hole dips.
- the coupling member can be used accordingly unfavorable alignment of the valve stem relative to the bore of the Coupling member take the valve with them, but only over a section the lifting height from where the valve moves under the action of the valve spring Valve seat strikes back undamped, which is very annoying noise and causes additional wear.
- the object of the invention is to provide a generic tappet, whose coupling link is safe and defined in defined periods of time or at certain cam angles can be switched from its end positions, so that low-wear, safe and fast switching is made possible.
- a high switching reliability of such a plunger is unlocked Locking of the coupling member in two, the switching positions of the valve assigned end positions reached.
- Locking of the coupling member in these two end positions is achieved that the respective Shifting process only after unlocking the respective on the coupling member attacking locking device is possible.
- the fact that the locking devices can be unlocked by the valve stem is the unlocking of the Coupling member depending on the position of the valve stem and thus possible from the angle of rotation of the cam or at a defined point in time. In order to can be ensured that the switching process in both directions starts at a specified time or within a specified period of time he follows. This corresponds to a defined angular position of the cam. Thus the switching process is carried out safely and defined in a short time.
- the locking of the coupling member in the two end positions especially safe if this occurs when the end positions are reached
- a spring element acts. This allows a quasi-automatic Allow locking at end positions without the intervention of the Valve stem further switching or Locking mechanisms become necessary.
- the spring elements can be in integrate into the plunger in a space-saving manner.
- An unlocking of one of the locking devices in the upper area of the lifting curve the corresponding cam can be achieved in an advantageous manner if the coupling member has a bore into which the valve stem corresponding position of the coupling member can immerse. Is the corresponding locking device positioned so that it through the valve stem in immersed state is unlocked, one is accordingly in the upper Effective unlocking reached. About the immersion length of the The switching time can be determined.
- the switching process is advantageous by moving the coupling member Way achieved when this has spaced support surfaces on which the piston on the one hand and on the other hand support a spring element, by their Interaction of the coupling member in its respective end positions (at unlocked locking device) is displaceable.
- the plunger is like one Cup built, can be advantageously in the interior of the Piston, the locking devices, the coupling member and a spring element insert, so that the plunger with the same space as conventional Cup tappet gets along.
- a possible form of the locking device can be advantageously form if a resilient locking bolt is formed in the plunger, which in the corresponding end position attacks on the coupling member.
- Another beneficial one Form of the formation of the locking device results from cooperation two interlocking parts of the coupling member and this leading track. The unlocking takes place in an advantageous manner by lifting the coupling member relative to the guideway.
- FIG. 1 An internal combustion engine (not shown in detail) has the one shown in FIG. 1 Area a cylindrical plunger 1, which has a switchable valve 2 is assigned and by means of a camshaft 4 having a cam 3 is operated.
- the plunger 1 is inserted into a bore 5 of a cylinder head 6 and is supported with a compression spring 7.
- the valve 2 includes one with the Valve seat 8 of the cylinder head 6 cooperating valve plate 9 and one Valve stem 10, which is provided with a valve spring plate 11.
- Valve spring plate 11 and cylinder head 6 a valve spring 12 is effective, which Holds valve 2 in the closed position or moves it to this position.
- a device 13 is arranged within the plunger 1, with the two Switch positions for valve 2 are adjustable. In the first switching position (Fig.
- valve 2 is activated, i.e. the valve stem follows the movement of the Cam applied stroke of the ram.
- valve 2 is switched off, i.e. the plunger 1 follows the stroke movement of the Cam 3 while the valve stem remains in place.
- the device 13 for switching the valve 2 is by a piston 14 and a coupling member 15 is formed, which are integrated in the plunger 1.
- the plunger 1 has the shape of a cylindrical cup 16, i.e. he has a jacket part 17 and a cup base 18 which extends a short distance from the cam 3.
- the cup base 18 serves to receive an adjustment plate 19 on the latter Top 20 of the cam 3 acts.
- A protrudes from the jacket part 17 of the cup 16 Extension 21 in the interior 22, which has a bore 23 for receiving and Guide of the piston 14 has.
- the bore 23 starts from a Outer periphery of the jacket part 17 circumferential annular groove 24, on the on itself known way of pressurizing the in the bore 23rd guided piston 14 takes place.
- a molded part 25 is inserted, which on Cup bottom 18 abuts and on the side opposite the extension 21 has a downwardly drawn portion 26.
- a spring tongue 27 is punched out and bent downwards.
- the interior 22 is covered on its underside by a guide plate 28 completed on an inner circumferential shoulder 29 of the jacket part 17th is present.
- the top of the guide plate 28 serves as a guideway 30 of approximately Coupling member 15 which can be moved perpendicularly to the valve movement
- Guides not shown in detail on the molded part 25 can be a straight line Allow movement of the coupling part 15.
- the guide plate 28 has one Opening 31, which is opposite to the valve stem 10 and from this appropriate movement can be penetrated.
- the coupling member 15 has two opposing support surfaces 32, 33.
- the piston 14 rests on the support surface 32 facing the extension 21, while a compression spring 34 is located on the opposite support surface 33 supports, the other end of which rests on the jacket part 17.
- a compression spring 34 is located on the opposite support surface 33 supports, the other end of which rests on the jacket part 17.
- the coupling member 15 is in the direction of the valve movement continuously penetrated by a bore 35, the diameter D larger is the diameter d of the valve stem.
- the coupling member 15 is on its top side has a recess 36 which is open at the top and towards the extension 21, that on the side facing away from the extension 21 by a stop 37 is limited. On this stop 37 is in the position shown in Fig.
- the coupling member 15 is on its underside facing the guide plate 28 has an extension 38, which in the end position shown in Fig. 2 protrudes into the opening 31 of the guide plate.
- the extension 38 is on the piston 14 opposite side of the bore 35 is formed.
- the coupling member 15 is under pressure when the piston 14 is depressurized the compression spring 34 in its (left) end position (bearing on the extension 21) protrudes the extension 38 into the opening 31 of the guide plate 28.
- the valve stem 10 is located on the extension 38 of the coupling member 15. Arrives at rotation of the cam 3 the area acting between this and the adjusting plate 19 in the transition between base circle 39 and flank area 40, the plunger 1 is by the Lifting action of the cam 3 pressed down until the coupling member 15 raised against the action of the spring tongue 27 and on the molding 25 is present. After this lifting of the coupling member 15 there is a rigid connection between cam 3, plunger 1 with coupling part 15 and Valve stem 10 so that corresponding stroke movements of the valve are triggered will.
- the cam 3 is formed in this embodiment so that the Base circle 39 comprises approximately an angle of 180 ° and the flank region 40 also includes about 180 °. Other cam shapes and other angular ranges are of course easily possible.
- Locking element e.g. a pawl
- a spring force or gravity is applied.
- valve 2 If valve 2 is to be reactivated from this switching position, the Piston 14 by appropriate control of the supplying it Hydraulic circuit are depressurized. A push back of the Coupling member 15 by the compression spring 34 is only possible if the second locking device 42 is released. Until then, this prevents 37 abutting end of the spring tongue 27 pushing back. 5 illustrated end position of the coupling member 15 dips (when depressurized Piston 14) of the valve stem 10 into the bore 35 of the coupling member 15. The cam 3 reaches the area in cooperation with the adjusting plate 19 its highest cam elevation (Nbll) is the valve stem 10 through corresponding pushing down of the plunger 1 almost completely into the Bore 35 immersed and abuts the spring tongue 27.
- Nbll cam elevation
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Description
- Fig. 1
- eine schematische Darstellung einer Brennkraftmaschine im Bereich eines Nockentriebes,
- Fig. 2 - 6
- Schnitte durch einen erfindungsgemäßen Stößel mit teilweise angedeuteten Nocken in verschiedenen Arbeitsstellungen.
Claims (15)
- Stößel für ein schaltbares Ventil (2) einer Brennkraftmaschine mit einer einen hydraulisch betätigten Kolben (14) und ein durch den Kolben betätigtes Kupplungsglied (15) umfassenden Einrichtung, durch die das Ventil in einer ersten Schaltstellung abgeschaltet und in einer zweiten Schaltstellung zur Gaswechselsteuerung aktiviert ist, wobei der Stößel mit einem Nocken (3) einer Nockenwelle (4) zusammenwirkt und das Kupplungsglied (15) in zwei, den Schaltstellungen zugeordneten Endstellungen durch eine erste (41) und eine zweite Sperreinrichtung (42) verriegelbar ist, dadurch gekennzeichnet, daß die Sperreinrichtungen jeweils durch den Ventilschaft (10) des Ventils (2) entriegelbar sind.
- Stößel nach Anspruch 1, dadurch gekennzeichnet, daß die Verriegelung des Kupplungsgliedes (15) jeweils bei Erreichen der Endstellungen durch Einwirken eines Federelementes (27) erfolgt.
- Stößel nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Kupplungsglied (15) eine Bohrung (35) aufweist, in die in einer (ersten) Endstellung der Ventilschaft (10) eintaucht, und daß der Ventilschaft (10) im eingetauchten Zustand eine der Sperreinrichtungen (Sperreinrichtung (41) oder Sperreinrichtung (42)) entriegelt.
- Stößel nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß in einer (zweiten) Endstellung des Kupplungsgliedes (15) der Ventilschaft (10) an diesem anliegt, und daß der Ventilschaft (10) bei Betätigung des Stößels (1) durch den Nocken (3) eine der Sperreinrichtungen (Sperreinrichtung (42) oder Sperreinrichtung (41)) entriegelt.
- Stößel nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das Kupplungsglied (15) beabstandete Stützflächen (32, 33) besitzt, an denen sich der Kolben (14) und ein Federelement (34) abstützen.
- Stößel nach Anspruch 3, dadurch gekennzeichnet, daß das Kupplungsglied (15) in einem ersten Nockenbahnbereich (Nbl) und in seiner ersten Endstellung durch die zugeordnete Sperreinrichtung (42) festgelegt wird, wogegen die Sperreinrichtung (42) in einem zweiten Nockenbahnbereich (Nbll) bei dieser Schaltstellung vom Ventilschaft (10) entriegelt wird, wodurch das Kupplungsglied (15) durch Zusammenwirken des Kolbens (14) und der Wirkung eines Federelementes (34) aus der ersten Endstellung zunächst in eine Zwischenstellung (Zs) und in dem folgenden ersten Nockenbahnbereich (Nbl) in eine zweite Endstellung bewegt wird, aus der es im ersten Nockenbahnbereich (Nbl) bei entgegengesetztem Zusammenwirken des Kolbens (14) und des Federelementes (34) in die erste Endstellung zurückgeführt wird.
- Stößel nach Anspruch 6, dadurch gekennzeichnet, daß der Durchmesser (D) der Bohrung (35) im Kupplungsglied (15) zur Erzielung der Zwischenstellung (Zs) größer ist als der Durchmesser (d) des Ventilschafts (10).
- Stößel nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Stößel (1) nach Art einer Tasse (16) aufgebaut ist und ein Mantelteil (17), einen Tassenboden (18) und einen davon umschlossenen Innenraum (22) umfasst, und daß in dem Innenraum (22) der Kolben (14), die Sperreinrichtungen (41, 42), das Kupplungsglied (15) und das Federelement (34) eingesetzt sind.
- Stößel nach Anspruch 8, dadurch gekennzeichnet, daß die eine Sperreinrichtung (42) zwischen Tassenboden (18) und Kupplungsglied (15) angeordnet ist.
- Stößel nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das Kupplungsglied (15) auf einer Führungsbahn (30) verschieblich und vom Ventilschaft (10) etwa senkrecht dazu anhebbar ist, und daß eine der Sperreinrichtungen (41) durch lösbar ineinandergreifende Teile (30, 31) des Kupplungsgliedes (15) und der Führungsbahn (30) gebildet ist.
- Stößel nach Anspruch 10, dadurch gekennzeichnet, daß das Kupplungsglied (15) gegen die Wirkung eines Federmittels (27) vom Ventilschaft (10) anhebbar ist.
- Stößel nach Anspruch 11, dadurch gekennzeichnet, daß das Federmittel (27) durch einen Teil der am Tassenboden (18) angeordneten Sperreinrichtung (42) gebildet ist.
- Stößel nach einem der Ansprüche 10 bis 12, dadurch gekennzeichnet, daß die Führungsbahn (30) eine Öffnung (31) aufweist, in die in der Verriegelungsstellung der zugeordneten Sperreinrichtung (41) ein Fortsatz (38) des Kupplungsgliedes (15) eingreift.
- Stößel nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß ein Teil der am Tassenboden (18) angeordneten Sperreinrichtung (41) an einem in die Tasse (16) eingesetzten Formteil (25) als Federzunge (27) ausgebildet ist.
- Stößel nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Führungsbahn (30) auf einer Führungsplatte (28) ausgebildet ist, die in die Tasse (16) eingesetzt ist, daß diese Führungsplatte (28) vom Ventilschaft (10) durchdringbar ist, und daß auf der Führungsplatte das Kupplungsglied (15) verschiebbar ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4444699A DE4444699A1 (de) | 1994-12-15 | 1994-12-15 | Stößel für ein schaltbares Ventil einer Brennkraftmaschine |
DE4444699 | 1994-12-15 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0717173A1 EP0717173A1 (de) | 1996-06-19 |
EP0717173B1 true EP0717173B1 (de) | 1998-08-12 |
Family
ID=6535884
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95115828A Expired - Lifetime EP0717173B1 (de) | 1994-12-15 | 1995-10-07 | Stössel für ein schaltbares Ventil einer Brennkraftmaschine |
Country Status (6)
Country | Link |
---|---|
US (1) | US5603293A (de) |
EP (1) | EP0717173B1 (de) |
JP (1) | JPH08218834A (de) |
KR (1) | KR960023608A (de) |
CN (1) | CN1132821A (de) |
DE (2) | DE4444699A1 (de) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19717537C1 (de) * | 1997-04-25 | 1998-12-24 | Porsche Ag | Ventiltrieb einer Brennkraftmaschine |
JP3400686B2 (ja) * | 1997-09-12 | 2003-04-28 | アイシン精機株式会社 | エンジンの可変動弁装置 |
JP4067662B2 (ja) * | 1998-09-14 | 2008-03-26 | 本田技研工業株式会社 | バルブ休止機構を有する内燃機関の弁装置 |
JP4163315B2 (ja) * | 1999-01-11 | 2008-10-08 | 本田技研工業株式会社 | エンジンの動弁装置 |
EP1447547B1 (de) * | 2003-02-17 | 2006-04-19 | Ford Global Technologies, LLC | Brennkraftmashine mit Vorrichtung zur Ventilhubsumschaltung |
US7036465B2 (en) * | 2004-03-17 | 2006-05-02 | Ricardo, Inc. | Two-stroke and four-stroke switching mechanism |
FR2979944B1 (fr) * | 2011-09-12 | 2016-05-06 | Valeo Systemes De Controle Moteur | Systeme de transmission du mouvement d'une came a au moins une soupape |
CN104121054B (zh) * | 2014-06-28 | 2017-03-22 | 范永建 | 一种活塞式发动机气门正时及可变升程驱动系统 |
US10662830B2 (en) | 2017-01-20 | 2020-05-26 | Yelir, Inc. | Dynamic locking and releasing cam lobe |
CN109113828B (zh) * | 2018-08-09 | 2020-09-15 | 襄阳美标朗源动力实业有限公司 | 一种发动机气缸气门组 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2952037A1 (de) * | 1979-12-22 | 1981-06-25 | Audi Nsu Auto Union Ag, 7107 Neckarsulm | Vorrichtung zum abschalten von hubventilen einer brennkraftmaschine |
US4770137A (en) * | 1985-02-08 | 1988-09-13 | Aisin Seiki Kabushiki Kaisha | Cylinder control device for variable-cylindered engine |
WO1993018284A1 (de) | 1992-03-06 | 1993-09-16 | F. Porsche Aktiengesellschaft | Zylinderkopf für eine brennkraftmaschine |
DE4219435C2 (de) * | 1992-06-13 | 1996-05-02 | Opel Adam Ag | Einrichtung zum Abschalten eines von einem Tassenstößel betätigten Ventils einer Brennkraftmaschine |
JPH06101437A (ja) * | 1992-09-18 | 1994-04-12 | Aisin Seiki Co Ltd | エンジンの動弁装置 |
DE4335431A1 (de) * | 1992-11-13 | 1995-04-20 | Iav Motor Gmbh | Schaltbarer Ventiltrieb mit Kipphebel und unterliegender Nockenwelle für Gaswechselventile für Verbrennungsmotoren |
US5488934A (en) * | 1993-09-22 | 1996-02-06 | Aisin Seiki Kabushiki Kaisha | Valve gear device |
EP0668436B1 (de) * | 1994-02-18 | 1998-08-12 | Dr.Ing.h.c. F. Porsche Aktiengesellschaft | Stössel für ein schaltbares Ventil einer Brennkraftmaschine |
DE4405189C2 (de) * | 1994-02-18 | 1996-07-11 | Porsche Ag | Stößel für ein abschaltbares Ventil einer Brennkraftmaschine |
-
1994
- 1994-12-15 DE DE4444699A patent/DE4444699A1/de not_active Withdrawn
-
1995
- 1995-10-07 DE DE59503155T patent/DE59503155D1/de not_active Expired - Fee Related
- 1995-10-07 EP EP95115828A patent/EP0717173B1/de not_active Expired - Lifetime
- 1995-12-06 US US08/568,291 patent/US5603293A/en not_active Expired - Fee Related
- 1995-12-15 JP JP7327329A patent/JPH08218834A/ja active Pending
- 1995-12-15 KR KR1019950050402A patent/KR960023608A/ko active IP Right Grant
- 1995-12-15 CN CN95121758A patent/CN1132821A/zh active Pending
Also Published As
Publication number | Publication date |
---|---|
KR960023608A (ko) | 1996-07-20 |
US5603293A (en) | 1997-02-18 |
JPH08218834A (ja) | 1996-08-27 |
CN1132821A (zh) | 1996-10-09 |
DE59503155D1 (de) | 1998-09-17 |
EP0717173A1 (de) | 1996-06-19 |
DE4444699A1 (de) | 1996-06-20 |
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