EP0824180B1 - Pneumatische Schliessfeder für ein Gaswechselventil einer Brennkraftmaschine - Google Patents
Pneumatische Schliessfeder für ein Gaswechselventil einer Brennkraftmaschine Download PDFInfo
- Publication number
- EP0824180B1 EP0824180B1 EP97111990A EP97111990A EP0824180B1 EP 0824180 B1 EP0824180 B1 EP 0824180B1 EP 97111990 A EP97111990 A EP 97111990A EP 97111990 A EP97111990 A EP 97111990A EP 0824180 B1 EP0824180 B1 EP 0824180B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- piston
- disposed
- valve
- seal
- 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
- 238000007789 sealing Methods 0.000 claims description 9
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 239000002826 coolant Substances 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims 1
- 239000003570 air Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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
- F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
- F01L1/462—Valve return spring arrangements
- F01L1/465—Pneumatic arrangements
Definitions
- the invention relates to a pneumatic closing spring in the preamble of claim 1 type as known from EP 0 697 540 B1.
- pneumatic springs also known as air or gas springs
- air or gas springs are each after their use to maintain a predetermined spring characteristic or to change the spring characteristic with a medium supply and / or discharge effecting device connected.
- a device can be an air or be gas storage, the respective storage or accumulator by means of charged an additional pressure source or via a separate Pump / compressor is constantly recharged.
- Exemplary configurations of the type described above for pneumatic closing springs for gas exchange valves of internal combustion engines are from the GB-PS 392 294, DE 38 08 542 C2 and EP 0 536 513 B1.
- the construction effort and space requirements of each of the known devices for supplying the respective Closing spring with the respective medium is not disadvantageous irrelevant.
- DE 29 49 413 A1 combines one with a metallic compression spring Pneumatic closing spring for a gas exchange valve known in which a Part of the air compressed during the valve opening stroke via one in both directions free-flowing throttle bore in a storage chamber for speed-dependent Change the air spring characteristic is pumped.
- AT-PS 322 918 is a self-pumping air suspension element to support relatively heavy loads, especially with wheel suspensions from Motor vehicles known. This includes one in a cylinder via an annular piston guided hollow piston rod, the one between cylinder and hollow piston rod and annular space sealed off by the annular piston via the movements the piston rod serves as a pump, the ambient air compressed in the annular space via a check valve in the one enclosed by the hollow piston rod Work space is introduced.
- the invention has for its object a generic pneumatic Further develop the closing spring in such a way that the supply to a working chamber a pneumatic medium with minimal construction effort without essential additional space is ensured.
- This object is achieved with claim 1, with the invention arrangement the pump device via the spring stroke of the pneumatic Closing spring, the pump device advantageously integrated into the closing spring in a compact manner is without significant additional space.
- This compact Unit is advantageously achieved in that the pump device between an outer cylinder and a piston skirt of the one guided in the cylinder Piston formed annular space, on the one hand via a fixedly arranged Seal the outer boundary of the working chamber of the closing spring limited is and on the other hand via a drive-proof with the piston beyond one connected in the outer cylinder to the annular space provided inlet opening Ring piston, the pump annulus via a channel in the outer cylinder with a pressure controlled opening valve with that of the piston essentially enclosed working chamber is in contact with the medium.
- this is in the invention Unit integrated valve in an extension of the pump annulus arranged with the working chamber of the spring connecting overflow channel.
- This configuration advantageously allows the arrangement of the Overflow channel or sections thereof and the expansion in the boundaries the cylinder and its bottom cover.
- the invention provides the bottom cover of the cylinder with a coaxial to the piston skirt of the piston arranged collar to provide, the sections of the working chamber of the plunging piston limiting collar with the cylinder downstream storage volume upstream of the pump annulus of the working chamber forms.
- valve receiving Extension of the overflow channel in the bottom of the bottom cover of the cylinder arranged, this extension with a limit, for example of the cylinder by drilling formed channel with the pump annulus communicates.
- a cooling chamber Via a concentrically arranged on the bottom cover to the piston Collar with one that interacts with the inside of the cylinder Sealing arrangement and with a cooperating with the outside of the piston skirt Sealing arrangement limits this collar with the cylinder a cooling chamber, which has openings in the cylinder, for example, with the Coolant circuit of an internal combustion engine can be connected.
- this cooling chamber with one in P 196 03 536 stands for a liquid-cooled one Internal combustion engine proposed cooling arrangement in connection.
- valve arranged between the pump annulus and the working chamber as One-way valve or check valve results from a certain introduced Medium volume that the pressure there is the compression pressure in the Pump annulus corresponds, so that no further gaseous medium over the One-way valve is conveyed to the working chamber.
- a pneumatic spring 1 is used in an internal combustion engine, not shown as a closing spring for one via a control shaft and an intermediate one Tappet 2 stroke-operated gas exchange valve 3.
- the plunger 2 is slidably movable in a cylinder 4 of the pneumatic closing spring 1 guided.
- the closing spring 1 comprises a shaft 5 the gas exchange valve 3 stroke-controlled piston 6 in a compressible Medium containing working chamber 7, and a working chamber 7 via a Valve 8 device 9 supplying pressure to the medium.
- the invention forms one of the closing spring 1 and the device 9 with a the spring stroke controlled pump device 10 designed a unit 11 self-pumping closing spring 1 for a gas exchange valve 3.
- the check valve 22 is in the bottom cover side Region of the cylinder 4 arranged in an extension 23 of the channel 21, the extension 23 with the working chamber via a throttle bore 24 connected is.
- the embodiment of the closing spring 1 shown in FIG. 2 differs of that in Figure 1 by the lack of a storage volume 26 to achieve a working chamber 7 which is larger in volume.
- the piston 6 points outdoors End portion of his piston skirt 12 beyond the fixed seal 13 a releasably arranged sealing and guide ring 27 for sliding connection with the cylinder 4, the cylinder 4 between the seal 13 and the sealing and guide ring 27 arranged has a ventilation opening 28.
- This closing spring 1 is also in combination with the spring stroke controlled Pump device 10 of a device supplying the working chamber 7 with medium 9 further developed into a self-pumping spring 1, from the place of use separate check for function and tightness guaranteed without restriction is.
- the closing spring 1 shown in Figure 3 is further according to the invention Design provided that a in the bottom cover wall area of the cylinder 4 arranged channel 21, the pump annulus 18 with one in the bottom 29 of the bottom cover 14 arranged, serving to accommodate the check valve 22 Extension 23 is connected.
- the design features further in that on the bottom cover 14 to the piston skirt 12 of the piston 6 Collar 25 arranged concentrically in the free end region of the pump annulus 18 has a delimiting seal arrangement 30 which is in an outer circumferential groove a seal cooperating with the inner circumference of the cylinder 4 31 and in an inner circumferential groove with the outer circumference of the piston skirt 12 cooperating seal 13 includes.
- this configuration allows the overflow channel 21 as a bore in a radially inwardly thickened wall section of the cylinder 4 and also the annular space between the collar 25 and to use the cylinder 4 as a cooling chamber 32 which has openings 33 in the cylinder 4, for example with a cooling device of the not shown
- the internal combustion engine is operatively connected, as described in more detail in P 196 03 536 is described.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Reciprocating Pumps (AREA)
- Valve Device For Special Equipments (AREA)
- Check Valves (AREA)
Description
- Figur 1
- Eine pneumatische Feder als Schließfeder für ein Gaswechselventil mit einer erfindungsgemäß angeordneten Pumpeinrichtung mit einem der Arbeitskammer vorgeschalteten Speichervolumen,
- Figur 2
- eine erfindungsgemäße pneumatische Feder als Schließfeder für ein Gaswechselventil mit einer vergrößerten Arbeitskammer durch einen am Kolben im freien Kolbenhemd-Ende lösbar angeordneten Dicht- und Führungsring,
- Figur 3
- eine erfindungsgemäße pneumatische Feder als Schließfeder für ein Gaswechselventil mit einer die Arbeitskammer abschnittsweise umgebenden Kühlkammer.
Claims (6)
- Pneumatische Schließfeder für ein Gaswechselventil einer Brennkraftmaschine,bei der ein Zylinder (4) und ein über einen Schaft (5) des Gaswechselventils (3) mittels eines im Zylinder (4) hubgesteuert einwirkend angeordneten Stößels (2) betätigter Kolben (6) mit einem Kolbenhemd (12) unter Zwischenschaltung einer Dichtung eine äußere Begrenzung einer ein komprimierbares Medium enthaltenden Arbeitskammer (7) bilden, wobeian einem Bodendeckel (14) des Zylinders (4) und am Kolben (6) den Ventilschaft (5) umschließend angeordnete, unter Zwischenschaltung einer weiteren Dichtung (15) teleskopartig zusammenwirkende Rohrabschnitte (16, 17) eine innere Begrenzung der Arbeitskammer (7) bilden, und weiterder Arbeitskammer (7) über ein Ventil (8, 22) des Medium druckgesteuert zuführbar ist,daß eine über den Federhub der Schließfeder (1) gesteuerte Pumpeneinrichtung (10) einen über einen am Kolben (6) angeordneten Ringkolben (20) bestimmten Ringraum (18) zwischen Zylinder (4) und Kolbenhemd (12) einerseits und einer fest angeordneten Dichtung (13) der äußeren Begrenzung der Arbeitskammer (7) und dem in Hubanfangsstellung jenseits einer Zuströmöffnung (19) im Zylinder (4) befindlichen Ringkolben (20) andererseits umfasst, wobeider Pumpenringraum(18) über einen Kanal (21) im äußeren Zylinder (4) mit einem druckgesteuert öffnenden Ventil (8, 22) mit der vom Kolben (6) im wesentlichen umschlossenen Arbeitskammer (7) mediumsführend in Verbindung steht.
- Schließfeder nach Anspruch 1, dadurch gekennzeichnetdaß das Ventil (8) bzw. das Rückschlagventil (22) im bodendeckelseitigen Bereich des Zylinders (4) in einer Erweiterung (23) des Kanals (21) angeordnet ist, wobeidie Erweiterung (23) mit der Arbeitskammer (7) über eine Drosselbohrung (24) in Verbindung steht (Figuren 1 bis 3).
- Schließfeder nach der Anspruche 1 und 2, dadurch gekennzeichnetdaß das Kolbenhemd (12) des hubgesteuerten Kolbens (6) in einen am Bodendeckel (14) des Zylinders (4) angeordneten Kragen (25) eintaucht, derpumpenringraumseitig die fest angeordnete Dichtung (13) der äußeren Begrenzung der Schließfeder (1) trägt, und fernerder dünnwandig gestaltete Kragen (25) mit einem bodendeckelseitigen Abschnitt des Zylinders (4) ein ringförmiges Speichervolumen (26) zwischen Pumpen-Ringraum (18) und Arbeitskammer (7) begrenzt, mit derdas mit dem Ringraum (18) druckgesteuert verbundene Speichervolumen (26) über die Drosselbohrung (24) in Verbindung steht (Figur 1).
- Schließfeder nach Anspruch 1 und 2, dadurch gekennzeichnet,daß der Kolben (6) im freien Endabschnitt seines Kolbenhemdes (12) jenseits der fest angeordneten Dichtung (13) einen lösbar angeordneten Dicht- und Führungsring (27) zur gleitbeweglichen Verbindung mit dem Zylinder (4) aufweist, wobeider Zylinder (4) zwischen der Dichtung (13) und dem Dicht- und Führungsring (27) angeordnet eine Belüftungsöffnung (28) aufweist (Figur 2).
- Schließfeder nach Anspruch 1 und 2, dadurch gekennzeichnet,daß ein im bodendeckelseitigen Wandbereich des Zylinders (4) angeordneter Kanal (21) den Pumpen-Ringraum (18) mit einer im Boden (29) des Bodendeckels (14) angeordneten, der Aufnahme des Ventils (8) bzw. des Rückschlagventils (22) dienenden Erweiterung (23) in Verbindung steht unddaß ein am Bodendeckel (14) zum Kolbenhemd (12) des Kolbens (6) konzentrisch angeordneter Kragen (25) im freien Endbereich eine den Pumpen-Ringraum (18) begrenzende Dichtungsanordnung (30) aufweist, diein einer Außenumfangsnut eine mit dem Innenumfang des Zylinders (4) zusammenwirkende Dichtung (31) sowie in einer Innenumfangsnut die mit dem Außenumfang des Kolbenhemdes (12) zusammenwirkende Dichtung (13) umfaßt (Figur 3).
- Schließfeder nach Anspruch 5, dadurch gekennzeichnet,daß der Kragen (25) mit dem Zylinder (4) eine Kühlkammer (32) begrenzt, dieüber Durchbrechungen (33) im Zylinder (4) mit einem Kühlmedium versorgt ist (Figur 3).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19632628 | 1996-08-13 | ||
DE19632628A DE19632628A1 (de) | 1996-08-13 | 1996-08-13 | Pneumatische Feder, insbesondere Schließfeder für ein Gaswechselventil einer Brennkraftmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0824180A1 EP0824180A1 (de) | 1998-02-18 |
EP0824180B1 true EP0824180B1 (de) | 2001-05-30 |
Family
ID=7802535
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97111990A Expired - Lifetime EP0824180B1 (de) | 1996-08-13 | 1997-07-15 | Pneumatische Schliessfeder für ein Gaswechselventil einer Brennkraftmaschine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0824180B1 (de) |
DE (2) | DE19632628A1 (de) |
ES (1) | ES2158411T3 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8375902B2 (en) | 2009-01-22 | 2013-02-19 | Brp-Powertrain Gmbh & Co. Kg | Air spring with cap |
US8550044B2 (en) | 2009-01-20 | 2013-10-08 | Brp-Powertrain Gmbh & Co. Kg | Air spring system for an internal combustion engine |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10016878A1 (de) * | 2000-04-05 | 2001-10-18 | Bayerische Motoren Werke Ag | Schliessfeder-Vorrichtung für den Ventiltrieb eines Gaswechselventils einer Brennkraftmaschine |
DE10207038A1 (de) * | 2002-02-20 | 2003-08-21 | Bayerische Motoren Werke Ag | Ventiltrieb für eine Brennkraftmaschine |
SE540998C2 (sv) | 2014-04-17 | 2019-02-26 | Freevalve Ab | Förbränningsmotor med pneumatisk ventilfjäder |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB392294A (en) | 1932-02-09 | 1933-05-18 | Albert Eustace Short | Improvements in or relating to valve mechanism for internal combustion engines |
DE1143398B (de) * | 1955-10-31 | 1963-02-07 | Adalbert Freyler | Pneumatische Teleskopfederung, insbesondere fuer Kraftfahrzeuge |
AT322918B (de) * | 1973-01-03 | 1975-06-10 | Cerny Anton Jun Fa | Selbstladendes, einstellbares luftfederungselement |
DE2949413A1 (de) * | 1979-12-08 | 1981-06-11 | Volkswagenwerk Ag, 3180 Wolfsburg | Vorrichtung zur veraenderung der rueckstellkraefte bei gaswechsel-steuerventilen von verbrennungsmotoren |
DE3020050C2 (de) * | 1980-05-24 | 1984-11-15 | Boge Gmbh, 5208 Eitorf | Selbstpumpende hydropneumatische Federung mit Niveauregelung für Fahrzeuge |
DE3808542C2 (de) | 1987-03-26 | 1994-03-24 | Volkswagen Ag | Ventiltrieb für ein Gaswechselventil einer Brennkraftmaschine |
EP0536513B1 (de) | 1991-08-21 | 1996-07-03 | Honda Giken Kogyo Kabushiki Kaisha | Hubventilsteuerungsvorrichtung für Brennkraftmaschine |
JPH06272521A (ja) * | 1993-03-19 | 1994-09-27 | Mazda Motor Corp | 内燃機関の動弁装置 |
EP0697540B1 (de) * | 1994-08-12 | 1999-09-29 | Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 | Pneumatische Feder, insbesondere für Gaswechselventile von Brennkraftmaschinen |
DE19603536C2 (de) | 1996-02-01 | 1999-01-14 | Bayerische Motoren Werke Ag | Ventiltrieb für eine Brennkraftmaschine mit einer pneumatischen Schließfeder für ein Gaswechselventil |
-
1996
- 1996-08-13 DE DE19632628A patent/DE19632628A1/de not_active Withdrawn
-
1997
- 1997-07-15 DE DE59703651T patent/DE59703651D1/de not_active Expired - Fee Related
- 1997-07-15 ES ES97111990T patent/ES2158411T3/es not_active Expired - Lifetime
- 1997-07-15 EP EP97111990A patent/EP0824180B1/de not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8550044B2 (en) | 2009-01-20 | 2013-10-08 | Brp-Powertrain Gmbh & Co. Kg | Air spring system for an internal combustion engine |
US8813697B2 (en) | 2009-01-20 | 2014-08-26 | Brp-Powertrain Gmbh & Co. Kg | Air spring system for an internal combustion engine |
US8375902B2 (en) | 2009-01-22 | 2013-02-19 | Brp-Powertrain Gmbh & Co. Kg | Air spring with cap |
Also Published As
Publication number | Publication date |
---|---|
ES2158411T3 (es) | 2001-09-01 |
DE19632628A1 (de) | 1998-02-19 |
DE59703651D1 (de) | 2001-07-05 |
EP0824180A1 (de) | 1998-02-18 |
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