EP1143115A2 - Schliessfeder-Vorrichtung für den Ventiltrieb eines Gaswechselventils einer Brennkraftmaschine - Google Patents
Schliessfeder-Vorrichtung für den Ventiltrieb eines Gaswechselventils einer Brennkraftmaschine Download PDFInfo
- Publication number
- EP1143115A2 EP1143115A2 EP01108364A EP01108364A EP1143115A2 EP 1143115 A2 EP1143115 A2 EP 1143115A2 EP 01108364 A EP01108364 A EP 01108364A EP 01108364 A EP01108364 A EP 01108364A EP 1143115 A2 EP1143115 A2 EP 1143115A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas
- spring
- piston
- chamber
- gas spring
- 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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
- F01L1/462—Valve return spring arrangements
- F01L1/465—Pneumatic arrangements
-
- 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
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/10—Connecting springs to valve members
Definitions
- the invention relates to a preamble of claim 1
- Closing spring device for the valve train of a gas exchange valve of an internal combustion engine in which a mechanical spring and from a predetermined engine speed range a controlled switchable gas spring in parallel cause the closing movement of the gas exchange valve, the gas spring one comprises a piston which closes in a stroke-movable manner.
- Such a closing spring device is for example from DE 38 08 542 C2 is known, with the speed-related change in the spring characteristic of the gas spring this is supplied with a medium from a pressure accumulator.
- EP 0 824 180 A1 describes a pneumatic closing spring for a gas exchange valve known an internal combustion engine, wherein a stroke-controlled piston the closing spring is equipped with devices that are self-pumping Result in closing spring.
- This well-known, cooperating with a tappet Closing spring is particularly complex due to the separate piston of the closing spring.
- the invention has for its object a generic closing spring device To show in a self-pumping design with a simple structure.
- the gas spring piston is designed as a plunger with one in one of the gas spring chamber separate room slidably guided piston shirt as a pump piston a self-pumping gas spring, which can be supplied from the controlled with a medium Pump room via a controlled switchable overflow channel compressed medium with essentially maximum opening stroke of the gas exchange valve is fed.
- the gas spring piston is a cylindrical tappet in a wall of the internal combustion engine fixed, pot-shaped insert with one in the bottom of the shaft of the gas exchange valve tightly penetrated opening a mechanical spring Gas spring chamber and an annular pump chamber can be lifted closes, one or more overflow channels connected to the pump chamber formed as grooves covered by the wall on the outer periphery of the insert are in an annular groove in the with the outer surface of the piston skirt correspond to the sliding surface of the insert.
- the tappet has in the outer Mantle surface of the piston skirt at a maximum opening stroke of the gas exchange valve the distributor groove assigned on the insert side, which is included in the Gas spring chamber directed overflow openings in the piston skirt in connection stands.
- the pressure in the Gas spring chamber successively increased until pressure equalization in the gas spring chamber with the maximum discharge pressure in the pump room.
- the pump device according to the invention remains switched on until Lowering the speed of the internal combustion engine into an engine speed range, in which the restoring force of the mechanical spring to reset the respective gas exchange valve is sufficient.
- a closing spring device 1 for the valve train of a gas exchange valve 2 one Internal combustion engine, not shown, comprises a mechanical spring 3, which a predetermined engine speed range by means of a controllable switchable Gas spring 4 in parallel connection the closing movement of the gas exchange valve 2 causes, the gas spring 4 closing a chamber 5 in a stroke-movable manner Piston 6 includes.
- the gas spring piston 6 is designed as a plunger 7 with one in one of the gas spring chamber 5 separate room 8 slidably guided piston skirt 9 as a pump piston a self-pumping gas spring 4, which is controlled from the medium Pump room 8 that can be supplied via a controllably switchable overflow channel 10 the compressed medium with a substantially maximum opening stroke of the gas exchange valve 2 is supplied.
- the gas spring piston 6 is a cylindrical cup tappet 7, which in a in a wall 11 of the not shown Internal combustion engine fixedly arranged cup-shaped insert 12 with a Bottom 13 of the shaft 14 of the gas exchange valve 2 tightly penetrated opening 15 a gas spring chamber 5 receiving the mechanical spring 3 and also closes an annular pump chamber 8 so that it can be moved, one or more overflow channels 10 connected to the pump chamber 8 than by the Wall 11 covered grooves are formed on the outer circumference of the insert 12. These overflow channels 10 open into an annular groove 16 in the with the outer Shell surface of the piston skirt 9 corresponding sliding surface 17 of the insert 12th
- the bucket tappet has for pushing the compressed air into the gas spring chamber 5 7 in the outer surface of the piston skirt 9 one at maximum Opening stroke of the gas exchange valve 2 assigned to the insert-side annular groove 16 Distributor groove 18, the overflow openings directed into the gas spring chamber 5 19 in the piston shirt 9 is connected.
- the overflow channels 10 are provided with a distributor line 20 to gas spring chambers 5 of gas springs 4 further gas exchange valves 2 in connection, the distribution line 20 via a stub 21 and a electronically controlled 2/2-way valve 22 for pressure regulation in the gas springs 4 communicates with a gas atmosphere.
- FIG. 1 further shows that the pump chamber 8 has a separate distributor line 23 connected to pump chambers 8 of gas springs 4 further gas exchange valves 2 is, the manifold 23 on the one hand with the respective pump chamber 8 an inflow line 24 that can be controlled by the respective piston skirt / pump piston 9 communicates and on the other hand electronically by means of another controlled 2/2-way valve 25 controllable inflow channel 26 with a gas atmosphere connected is.
- the gas atmosphere is preferably the normal atmosphere of the free environment.
- the inflow channel 26 is to the pump chamber 8 closed by the 2/2-way valve 25, whereas the gas or air spring 4 including the pump chamber 8 via the spur line 21 and the overflow channels 10 are ventilated when the 2/2-way valve 22 is openly controlled. Not with this one The position of the two directional control valves 22 and 25 shown is the gas or air spring 4 practically ineffective.
- the gas or air spring 4 has one Characteristic curve according to curve "A".
- the curve "B" in Figure 2 achieved.
- this also advantageously enables any intermediate curve and thus a corresponding pressure in the gas or to produce air spring 4, namely in that the air supply to Pump chamber 8 serving 2/2-way valve 25 and that for venting the gas spring chamber 5 serving 2/2-way valve 22 together depending on the machine speed cyclically driven between their closing and opening positions are, whereby the respective desired pressure value in the gas spring chamber 5th by alternately closing and opening the inflow channel 26 and Stub 21 is achieved.
- the Pot-shaped insert 12 formed in two parts from a and positively connected tubular sleeve 27 and a fixedly arranged therein Stopper 28, which means by means of an opposite sleeve diameter in the outer diameter reduced collar 29 of the design of the pump chamber 8 serves.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Fluid-Driven Valves (AREA)
Abstract
Description
- Figur 1
- eine erfindungsgemäße Schließfeder-Vorrichtung für den Ventiltrieb eines Gaswechselventils einer Brennkraftmaschine,
- Figur 2
- ein Diagramm mit Federkennlinien.
Claims (8)
- Schließfeder-Vorrichtung für den Ventiltrieb eines Gaswechselventils einer Brennkraftmaschine,bei der eine mechanische Feder (3) und ab einem vorbestimmten Maschinendrehzahlbereich eine gesteuert zuschaltbare Gasfeder (4) in Parallelschaltung die Schließbewegung des Gaswechselventils (2) bewirken, wobeidie Gasfeder (4) einen eine Kammer (5) hubbeweglich verschließenden Kolben (6) umfasst,dass der Gasfeder-Kolben (6) als ein Stößel (7) gestaltet ist mit einem in einem von der Gasfeder-Kammer (5) gesonderten Raum (8) gleitbeweglich dicht geführten Kolbenhemd (9) als Pumpenkolben einer selbstpumpenden Gasfeder (4), deraus dem mit einem Medium gesteuert versorgbaren Pumpenraum (8) über einen gesteuert zuschaltbaren Überströmkanal (10) das komprimierte Medium bei im wesentlichen maximalem Öffnungshub des Gaswechselventils (2) zugeführt ist.
- Vorrichtung nach Anspruch 1, dadurch gekennzeichnet,dass der Gasfeder-Kolben (6) ein zylindrischer Tassenstößel (7) ist, derin einem in einer Wandung (11) der Brennkraftmaschine fixiert angeordneten, topfförmigen Einsatz (12) mit einer im Boden (13) vom Schaft (14) des Gaswechselventils (2) dicht durchsetzten Durchbrechung (15) eine die mechanische Feder (3) aufnehmende Gasfeder-Kammer (5) sowie einen ringförmigen Pumpenraum (8) hubbeweglich verschließt, wobeiein oder mehrere mit dem Pumpenraum (8) verbundene Überströmkanäle (10) als von der Wandung (11) bedeckte Nuten am Außenumfang des Einsatzes (12) ausgebildet sind, diein eine Ringnut (16) in der mit der äußeren Mantelfläche des Kolbenhemdes/Pumpenkolbens (9) korrespondierenden Gleitfläche (17) des Einsatzes (12) münden.
- Vorrichtung nach Anspruch 1 und 2, dadurch gekennzeichnet,dass der Tassenstößel (7) in der äußeren Mantelfläche des Kolbenhemdes (9) eine bei maximalem Öffnungshub des Gaswechselventils (2) der einsatzseitigen Ringnut (16) zugeordnete Verteilernut (18) aufweist, diemit in die Gasfeder-Kammer (5) gerichteten Überströmöffnungen (19) im Kolbenhemd/Pumpenkolben (9) in Verbindung steht.
- Vorrichtung nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet,dass die Überströmkanäle (10) mit einer Verteilerleitung (20) zu Gasfeder-Kammern (5) von Gasfedern (4) weiterer Gaswechselventile (2) in Verbindung stehen, wobeidie Verteilerleitung (20) über eine Stichleitung (21) und einem elektronisch gesteuerten 2/2-Wegeventil (22) zur Druckregelung in den Gasfedern (4) mit einer Gas-Atmosphäre in Verbindung steht.
- Vorrichtung nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet,dass der Pumpenraum (8) mit einer gesonderten Verteilerleitung (23) zu Pumpenräumen (8) von Gasfedern (4) weiterer Gaswechselventile (2) verbunden ist, wobeidie Verteilerleitung (23) einerseits mit dem jeweiligen Pumpenraum (8) über eine vom jeweiligen Kolbenhemd/Pumpenkolben (9) absteuerbare Zuströmleitung (24) in Verbindung steht, und andererseitsüber einen mittels eines weiteren elektronisch gesteuerten 2/2-Wegeventils (25) steuerbaren Zuströmkanal (26) mit einer Gas-Atmosphäre verbunden ist.
- Vorrichtung nach den Ansprüchen 1 bis 5, dadurch gekennzeichnet, dass die Gas-Atmosphäre die Normal-Atmosphäre der freien Umgebung ist.
- Vorrichtung nach den Ansprüchen 1 bis 6, dadurch gekennzeichnet, dass das der Luftzufuhr zum Pumpenraum (8) dienende 2/2-Wegeventil (25) und das der Entlüftung der Gasfeder-Kammer (5) dienende 2/2-Wegeventil (22) gemeinsam maschinendrehzahlabhängig taktgesteuert zwischen ihren Schließ- und Öffnungspositionen verlagerbar angetrieben sind.
- Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet,dass der topfförmige Einsatz (12) zweiteilig ausgebildet ist aus einer mit der Wandung (11) kraft- und formschlüssig verbundenen rohrartigen Hülse (27) und einem in dieser fest angeordneten Pfropfen (28), dermittels eines gegenüber dem inneren Hülsendurchmesser im Außendruchmesser reduzierten Kragens (29) der Ausbildung des Pumpenraumes (8) zwischen der Hülse (27) und dem Kragen (29) dient.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10016878 | 2000-04-05 | ||
DE10016878A DE10016878A1 (de) | 2000-04-05 | 2000-04-05 | Schliessfeder-Vorrichtung für den Ventiltrieb eines Gaswechselventils einer Brennkraftmaschine |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1143115A2 true EP1143115A2 (de) | 2001-10-10 |
EP1143115A3 EP1143115A3 (de) | 2003-01-02 |
EP1143115B1 EP1143115B1 (de) | 2004-01-28 |
Family
ID=7637639
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01108364A Expired - Lifetime EP1143115B1 (de) | 2000-04-05 | 2001-04-03 | Schliessfeder-Vorrichtung für den Ventiltrieb eines Gaswechselventils einer Brennkraftmaschine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1143115B1 (de) |
DE (2) | DE10016878A1 (de) |
ES (1) | ES2213650T3 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009087441A1 (en) * | 2007-12-21 | 2009-07-16 | Ferrari S.P.A. | Pneumatic system for controlling the valves of an internal combustion engine |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10207038A1 (de) * | 2002-02-20 | 2003-08-21 | Bayerische Motoren Werke Ag | Ventiltrieb für eine Brennkraftmaschine |
DE10243388B4 (de) * | 2002-09-13 | 2012-02-09 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Pneumatische Ventilfeder für Gaswechselventile von Brennkraftmaschinen |
EP2208870B1 (de) | 2009-01-20 | 2013-03-27 | BRP-Powertrain GmbH & Co. KG | Luftfedersystem für Verbrennungsmotoren |
EP2211031B1 (de) | 2009-01-22 | 2013-07-10 | BRP-Powertrain GmbH & Co. KG | Luftfeder mit Kappe |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2949413A1 (de) * | 1979-12-08 | 1981-06-11 | Volkswagenwerk Ag, 3180 Wolfsburg | Vorrichtung zur veraenderung der rueckstellkraefte bei gaswechsel-steuerventilen von verbrennungsmotoren |
EP0269587A1 (de) * | 1986-10-20 | 1988-06-01 | Ab Volvo | Ventilfederanordnung in Verbrennungsmotoren |
DE3808542A1 (de) * | 1987-03-26 | 1988-10-06 | Volkswagen Ag | Ventiltrieb fuer ein gaswechselventil einer brennkraftmaschine |
EP0396327A1 (de) * | 1989-04-26 | 1990-11-07 | Honda Giken Kogyo Kabushiki Kaisha | Ventilsteuerungsvorrichtung für Brennkraftmaschinen |
DE4214839A1 (de) * | 1992-05-05 | 1993-11-11 | Audi Ag | Ventiltrieb für eine Brennkraftmaschine |
EP0787893A1 (de) * | 1996-02-01 | 1997-08-06 | Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 | Ventiltrieb für Brennkraftmaschinen mit einer pneumatischen Schliessfeder für ein Gaswechselventil |
EP0824180A1 (de) * | 1996-08-13 | 1998-02-18 | Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 | Pneumatische Schliessfeder für ein Gaswechselventil einer Brennkraftmaschine |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3484498B2 (ja) * | 1993-09-30 | 2004-01-06 | ヤマハ発動機株式会社 | 4サイクルエンジン |
DE59506935D1 (de) * | 1994-08-12 | 1999-11-04 | Bayerische Motoren Werke Ag | Pneumatische Feder, insbesondere für Gaswechselventile von Brennkraftmaschinen |
-
2000
- 2000-04-05 DE DE10016878A patent/DE10016878A1/de not_active Withdrawn
-
2001
- 2001-04-03 DE DE50101377T patent/DE50101377D1/de not_active Expired - Lifetime
- 2001-04-03 EP EP01108364A patent/EP1143115B1/de not_active Expired - Lifetime
- 2001-04-03 ES ES01108364T patent/ES2213650T3/es not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2949413A1 (de) * | 1979-12-08 | 1981-06-11 | Volkswagenwerk Ag, 3180 Wolfsburg | Vorrichtung zur veraenderung der rueckstellkraefte bei gaswechsel-steuerventilen von verbrennungsmotoren |
EP0269587A1 (de) * | 1986-10-20 | 1988-06-01 | Ab Volvo | Ventilfederanordnung in Verbrennungsmotoren |
DE3808542A1 (de) * | 1987-03-26 | 1988-10-06 | Volkswagen Ag | Ventiltrieb fuer ein gaswechselventil einer brennkraftmaschine |
EP0396327A1 (de) * | 1989-04-26 | 1990-11-07 | Honda Giken Kogyo Kabushiki Kaisha | Ventilsteuerungsvorrichtung für Brennkraftmaschinen |
DE4214839A1 (de) * | 1992-05-05 | 1993-11-11 | Audi Ag | Ventiltrieb für eine Brennkraftmaschine |
EP0787893A1 (de) * | 1996-02-01 | 1997-08-06 | Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 | Ventiltrieb für Brennkraftmaschinen mit einer pneumatischen Schliessfeder für ein Gaswechselventil |
EP0824180A1 (de) * | 1996-08-13 | 1998-02-18 | Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 | Pneumatische Schliessfeder für ein Gaswechselventil einer Brennkraftmaschine |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009087441A1 (en) * | 2007-12-21 | 2009-07-16 | Ferrari S.P.A. | Pneumatic system for controlling the valves of an internal combustion engine |
US8424499B2 (en) | 2007-12-21 | 2013-04-23 | Ferrari S.P.A. | Pneumatic system for controlling the valves of an internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
EP1143115A3 (de) | 2003-01-02 |
DE50101377D1 (de) | 2004-03-04 |
EP1143115B1 (de) | 2004-01-28 |
ES2213650T3 (es) | 2004-09-01 |
DE10016878A1 (de) | 2001-10-18 |
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