EP0167648B1 - Dispositif d'étanchéité - Google Patents
Dispositif d'étanchéité Download PDFInfo
- Publication number
- EP0167648B1 EP0167648B1 EP19840108101 EP84108101A EP0167648B1 EP 0167648 B1 EP0167648 B1 EP 0167648B1 EP 19840108101 EP19840108101 EP 19840108101 EP 84108101 A EP84108101 A EP 84108101A EP 0167648 B1 EP0167648 B1 EP 0167648B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sealing body
- rotary valve
- sealing
- valve member
- combustion chamber
- 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
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
- F01L7/00—Rotary or oscillatory slide valve-gear or valve arrangements
- F01L7/02—Rotary or oscillatory slide valve-gear or valve arrangements with cylindrical, sleeve, or part-annularly shaped valves
- F01L7/028—Rotary or oscillatory slide valve-gear or valve arrangements with cylindrical, sleeve, or part-annularly shaped valves having the rotational axis coaxial with the cylinder axis and the valve surface not surrounding piston or 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
- F01L7/00—Rotary or oscillatory slide valve-gear or valve arrangements
- F01L7/16—Sealing or packing arrangements specially therefor
Definitions
- the invention relates to a sealing arrangement for a rotary valve arranged in the combustion chamber of an internal combustion engine, which opens and closes the inlet and outlet openings of gas channels in the cylinder head for the gas exchange, each having a cylindrical sealing body which can be displaced axially in the gas channels of the cylinder head and which can be rotated about its axis has a surface facing away from the rotary valve, between which and an adjacent surface of the cylinder an annular gap is formed which is in permanent communication with the combustion chamber, the combustion chamber gas pressure acting on the surface of the sealing body facing away from the rotary valve, the sealing body with a resulting force against the rotary valve presses.
- Such a sealing arrangement is known from CH-A-223 378.
- the sealing body lies in the cylinder and is under high thermal stress, especially since the sealing body is constantly subjected to hot gas during the compression and working stroke.
- the service life of the sealing body on the one hand and its sealing effect on the other hand are therefore only limited.
- a similar sealing arrangement is known from DE-C-758 968, in which the sealing body is held on the inside surface of an approximately hollow spherical rotary valve by gas pressure in the combustion chamber.
- the ring-shaped sealing body is rotatable, but it is flushed with hot fuel gases so that it cannot seal permanently due to heat distortion and the formation of coal.
- US-A-2 282 594 shows another seal arrangement.
- the sealing body is assigned to the much cooler cylinder head and the sealing body is only in. the exhaust phase in connection with the combustion chamber. Fuel gases can only reach the sealing body during this short exhaust phase, which would benefit the life of the sealing body.
- this known proposal has the decisive disadvantage that the sealing body is pressed against the rotary valve by means of a mechanical spring.
- the spring force must be selected according to the maximum gas pressure in the combustion chamber. For most of the work cycle, the contact pressure is far too high and this leads to rapid wear of the sealing body and thus only to a very limited service life.
- the sealing body is not rotatable but only axially displaceable. Even due to the heat fluctuations, a uniform all-round seal is no longer available, at least after a certain operating time.
- US-A-1 354 539 shows an even more disadvantageous solution in that only a spring-loaded sealing body is also used and gas pressure is not present.
- the sealing body is arranged on the combustion chamber side of the rotary valve, so that this solution has the disadvantages of both known categories.
- the object of the invention is to arrange the sealing body of the type mentioned with constantly pressurized gas pressure of the combustion chamber while maintaining its sealing function so that it is better protected against heat in order to increase the service life.
- This object is achieved in that the sealing body rests on the rotary valve surface facing away from the combustion chamber on the rotary valve and that the annular gap communicates with the combustion chamber via a channel lying outside the outer circumference of the sealing body.
- the new sealing arrangement combines the advantages of the inner arrangement and the outer arrangement of the sealing body with respect to the rotary valve, without having their disadvantages.
- the sealing body is assigned to the cylinder head, so it is protected from the combustion chamber by the rotary valve during most of the working cycle.
- the sealing body is exposed to much less heat and therefore lasts much longer. Nevertheless, thanks to the fact that the sealing body is acted upon by the combustion chamber pressure, it is ensured that only the contact pressure which is currently required is provided depending on the instantaneous combustion chamber pressure.
- a spherical rotary slide 12 is rotatably mounted coaxially to the cylinder axis and is driven by the crankshaft (not shown) via a connecting shaft 14 and two gear wheels 16, 18.
- the rotary slide valve 12 has a gas channel 20 which opens and closes the inlet channel 22 and the outlet channel 24 in succession.
- the combustion chamber is designated 26.
- Sealing body 28 is rotatably mounted about the gas channel axes 30.
- Each sealing body has a cylindrical wall 32 and an end sealing surface 34 which is designed as a spherical cap ring surface corresponding to the outer surface of the rotary valve 12.
- the gas channel 22 has an enlarged section 36, in which the peripheral wall 32 is received with axial play and slight radial play.
- Outer ring grooves 38 in the peripheral wall 32 of the sealing body 28 accommodate sealing rings 40 which seal the gas channel 22 with respect to the combustion chamber.
- the peripheral wall 32 of the sealing body 28 On the face side, the peripheral wall 32 of the sealing body 28 has an outer collar 42, the outer diameter of which is larger than the inner diameter of the section 36 of the gas channel 22.
- the outer collar 42 lies face-to-face on the rotary valve 12 and is held in place by a very soft spring 44 even when there is no gas pressure.
- the spring 44 is accommodated in an annular groove 46 in the cylinder head 10, is supported on the groove bottom and presses on the rear end face of the peripheral wall 32 of the sealing body 28.
- the bore section 36 of the channel 22 is widened in the region of the outlet opening at 48 in order to accommodate the outer collar 42 of the sealing body 28 with radial play.
- a circumferential gap 50 is formed between the inner circumferential surface of the area 48 and the outer circumferential surface of the collar 42 and communicates continuously with the combustion chamber 26.
- This circumferential gap 50 is also connected to a radial annular gap 52 which is formed between a rear surface 54 of the collar 42 of the sealing body 28 facing away from the rotary valve 12 and the combustion chamber 26 and the opposite surface 56 of the cylinder head 10. The rear surface 54 is thus acted upon by the gas pressure in the combustion chamber 26.
- FIG. 4 shows a cylinder head 11 in which a rotary slide valve 13 is mounted, which instead of a spherical one has a flat sealing surface.
- the gas channels 22 open in the cylinder head axially parallel to the cylinder axis.
- the associated sealing body 28 according to FIG. 5 in the inlet duct 22 and in the outlet duct (not shown) differs from that according to FIG. 3 only in that the sealing surface 35 is flat.
- FIG. 6 shows a sealing body 29 without an outer collar 42. It consists of a circular cylindrical hollow body which is rotatably and axially displaceably inserted in a cylindrical section 37 of the gas channel 22 which is enlarged in diameter.
- annular groove 58 is formed which is opposite an annular groove 60 corresponding in the opposite surface 56 of the cylinder head 11.
- a cylindrical sealing ring in the form of a band-shaped web 61 engages with its two opposite ends in the ring grooves 58, 60.
- the rear end face 54 of the sealing body 29 which adjoins the sealing ring 61 on the outside forms the effective surface under gas pressure for pressing the sealing body onto the rotary slide valve.
- the sealing body 29 has a small radial distance from the channel section 37 of the cylinder head 11, as a result of which the peripheral gap 50 is formed, which connects the combustion chamber to the annular gap 52.
- the cylinder head 11 has an annular recess 62 surrounding the gas channel 22, which is only open to the combustion chamber.
- a sealing body 29 ' is in turn rotatably received with axial play.
- the axial length of the sealing body 29 ' is somewhat smaller than the length of the annular recess 62.
- the annular gap 52 acted upon by gas pressure is effective over the entire rear end face of the sealing body 29' facing away from the rotary valve.
- the sealing body 29 ′ is protected by a peripheral wall 64 facing the gas channel 22. This version is particularly advantageous for the outlet duct.
- peripheral wall 64 Provided in the peripheral wall 64 are two peripheral grooves 66 which are open toward the annular recess 62 and in which sealing rings 40 are arranged which bear against the inner surface of the sealing body 29 '. Between the outer surface of the sealing body 29 ′ and the adjacent outer peripheral surface of the annular recess 62, a peripheral gap is again formed, which feeds the annular gap 52 with the gas pressure of the combustion chamber 26.
- FIGS. 6 and 7 can also be used in connection with the spherical rotary slide valve 12 according to FIG. 1.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Taps Or Cocks (AREA)
Claims (8)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19833300973 DE3300973C2 (de) | 1983-01-13 | 1983-01-13 | Dichtungsanordnung für einen Drehschieber einer Brennkraftmaschine |
EP19840108101 EP0167648B1 (fr) | 1983-01-13 | 1984-07-11 | Dispositif d'étanchéité |
DE8484108101T DE3463071D1 (en) | 1984-07-11 | 1984-07-11 | Sealing arrangement |
AT84108101T ATE26475T1 (de) | 1984-07-11 | 1984-07-11 | Dichtungsanordnung. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19833300973 DE3300973C2 (de) | 1983-01-13 | 1983-01-13 | Dichtungsanordnung für einen Drehschieber einer Brennkraftmaschine |
EP19840108101 EP0167648B1 (fr) | 1983-01-13 | 1984-07-11 | Dispositif d'étanchéité |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0167648A1 EP0167648A1 (fr) | 1986-01-15 |
EP0167648B1 true EP0167648B1 (fr) | 1987-04-08 |
Family
ID=25807532
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19840108101 Expired EP0167648B1 (fr) | 1983-01-13 | 1984-07-11 | Dispositif d'étanchéité |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0167648B1 (fr) |
DE (1) | DE3300973C2 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3300973C2 (de) * | 1983-01-13 | 1985-08-01 | Alfred Dipl.-Ing. Geißler (FH), 8999 Weiler-Simmerberg | Dichtungsanordnung für einen Drehschieber einer Brennkraftmaschine |
DE4410109C2 (de) * | 1994-03-21 | 1997-09-04 | Peter Fertig | Drehschiebergrundkörper und Vorrichtung zur Gaswechselsteuerung |
GB9820923D0 (en) * | 1998-09-28 | 1998-11-18 | Bsa Rocv Limited | Improvements in or relating to rotary valves |
CN108871784B (zh) * | 2018-04-27 | 2020-12-18 | 北京航天动力研究所 | 一种用于液体火箭发动机推力室气流试验的固定装置 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1357600A (en) * | 1920-11-02 | Chakles t | ||
US1354539A (en) * | 1919-03-24 | 1920-10-05 | Dickerson Engine Company | Port-packing for rotary valves |
DE678953C (de) * | 1935-06-20 | 1939-07-26 | Argus Motoren Ges M B H | Abdichtung fuer Brennkraftmaschinen mit umlaufendem oder um seine Mittelachse schwingendem Schieber in Gestalt einer Kugel |
US2283594A (en) * | 1935-07-23 | 1942-05-19 | Aspin Frank Metcalf | Internal combustion engine |
CH223378A (de) * | 1938-05-20 | 1942-09-15 | Versuchsanstalt Fuer Luftfahrt | Einrichtung an Brennkraftmaschinen mit scheibenförmigem Drehschieber zur Abdichtung des Schiebers. |
DE758968C (de) * | 1940-04-17 | 1954-06-28 | Bmw Flugmotorenbau Ges M B H | Abdichtung fuer drehschiebergesteuerte Brennkraftmaschinen |
DE904959C (de) * | 1951-08-28 | 1954-02-25 | Nsu Werke Ag | Luftgekuehlter Viertakt-Verbrennungsmotor mit Drehschiebersteuerung |
DE3300973C2 (de) * | 1983-01-13 | 1985-08-01 | Alfred Dipl.-Ing. Geißler (FH), 8999 Weiler-Simmerberg | Dichtungsanordnung für einen Drehschieber einer Brennkraftmaschine |
-
1983
- 1983-01-13 DE DE19833300973 patent/DE3300973C2/de not_active Expired
-
1984
- 1984-07-11 EP EP19840108101 patent/EP0167648B1/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
EP0167648A1 (fr) | 1986-01-15 |
DE3300973C2 (de) | 1985-08-01 |
DE3300973A1 (de) | 1984-07-26 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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