EP0383143A2 - Radial sealing - Google Patents

Radial sealing Download PDF

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Publication number
EP0383143A2
EP0383143A2 EP90102257A EP90102257A EP0383143A2 EP 0383143 A2 EP0383143 A2 EP 0383143A2 EP 90102257 A EP90102257 A EP 90102257A EP 90102257 A EP90102257 A EP 90102257A EP 0383143 A2 EP0383143 A2 EP 0383143A2
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EP
European Patent Office
Prior art keywords
sealing strip
filler
running surface
radial seal
opening
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
Application number
EP90102257A
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German (de)
French (fr)
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EP0383143B1 (en
EP0383143A3 (en
Inventor
Jonathan Mark Lauter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
John Deere Technologies International Inc
Original Assignee
Deere and Co
Rotary Power International Inc
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Publication date
Application filed by Deere and Co, Rotary Power International Inc filed Critical Deere and Co
Publication of EP0383143A2 publication Critical patent/EP0383143A2/en
Publication of EP0383143A3 publication Critical patent/EP0383143A3/en
Application granted granted Critical
Publication of EP0383143B1 publication Critical patent/EP0383143B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C19/00—Sealing arrangements in rotary-piston machines or engines
    • F01C19/02—Radially-movable sealings for working fluids
    • F01C19/04—Radially-movable sealings for working fluids of rigid material

Definitions

  • the invention relates to a radial seal for rotary piston engines with an inner running surface and a polygonal piston, in the corners of which a radially and axially extending groove for displaceably receiving a sealing strip which can be brought into abutment with the upper edge against the running surface and which has at least one in Has peripheral opening in which a filler is inserted.
  • the object to be achieved with the invention is seen in equalizing the gas pressure which acts on both sides of the sealing strip when pressure is applied.
  • This object has been achieved in that each filler piece is loosely received in the associated opening.
  • the gas differential pressure can move the filler (s) into a friction pressure or frictional engagement with one of the side walls of the groove or grooves, whereby the initial valve effect is achieved.
  • this frictional contact or frictional engagement is not able to hinder or delay the radial movement of the sealing strips, so that on the whole a continuous and improved Sealing performance between the piston and the inner tread is achieved.
  • Each sealing strip has at least one opening, so that the side faces of the sealing strips which are exposed to the gas differential pressure are reduced and the pressure on both sides of the sealing strip is equalized.
  • each filler has a smaller coefficient of friction than the associated sealing strip.
  • each sealing strip can have a plurality of openings arranged at a mutual distance from one another and lying axially one behind the other, in each of which one filler piece is loosely received.
  • a rotary piston engine which has become known as a Wankel engine is equipped with a housing 10 which has an inner running surface 12 or jacket surface and encloses a working space 14.
  • a piston 16 equipped with three corners rotates in the working space 14 around a conventional eccentric, which is not shown for the sake of simplicity and is provided at each corner with a radially and axially extending groove 18, the side walls of which are designated 20 and 22.
  • the groove 18 is part of a radial seal and receives a sealing strip 28 with a certain lateral play.
  • the latter is radially displaceable in the groove 18 in order to be able to bear against the inner running surface 12 in a sealing manner.
  • the radial movement in the direction of the inner running surface 12 normally takes place due to the gas pressure prevailing in the working space 14 and acting on the sealing strip 28 from below and can also be supported by a spring (not shown).
  • the higher gas pressure in the respective work area acts on a side surface of the sealing strip and continues to the bottom of the groove, as a result of which the sealing strip is pushed out.
  • the sealing strip 28, shown in particular in FIG. 2, has a plurality of openings 30, for example bores, which are arranged at a mutual spacing from one another and extend through the sealing strip 28 in a direction perpendicular to the side walls 20 and 22, ie the openings are included With respect to the direction of rotation open on both sides and reduce the side surface of the sealing strip 28, which is exposed to the gas differential pressure.
  • the breakthroughs also serve to allow gas pressure from one side of the sealing strip 28 to reach the opposite side thereof, in order to very quickly compensate for the gas pressure between these two sides and thereby to make frictional contact between the sealing strip 28 and the respective side wall 20, 22 of the Groove 18 to decrease.
  • FIG. 3 shows a further exemplary embodiment for a sealing strip 28 which, in contrast to the embodiment according to FIG. 2, has only a single large opening 34, for example in a rectangular shape.
  • a single filler 36 with less friction is also loosely inserted.
  • All fillers 32 or 34 are preferably made of a material that has a lower coefficient of friction than the associated sealing strip 28, such as substances obtained from phenol, Teflon or polyamide.
  • the resulting radial seal has small lateral sealing surfaces, low lateral frictional contact and gas pressure compensation with a reduced volume exposed to the gas pressure.
  • Such radial seals can be used with all polygonal pistons.

Abstract

Radialdichtung für Kreiskolbenmotoren mit einer inneren Lauffläche (12) und einem mehreckigen Kolben (16), in des­sen Ecken jeweils eine sich radial und axial erstreckende Nut (18) zur verschiebbaren Aufnahme einer mit ihrer Ober­kante gegen die Lauffläche (12) zur Anlage bringbaren Dichtleiste (28) eingearbeitet ist, die mindestens eine in Umfangsrichtung offene Durchbrechung (30) aufweist, in der ein Füllstück (32) eingesetzt ist, das lose in der zugehö­rigen Durchbrechung (30) aufgenommen ist.

Figure imgaf001
Radial seal for rotary piston engines with an inner running surface (12) and a polygonal piston (16), in the corners of which each have a radially and axially extending groove (18) for displaceably receiving a sealing strip (the upper edge of which can be brought into contact with the running surface (12)) 28) is incorporated, which has at least one opening (30) open in the circumferential direction, in which a filler piece (32) is inserted, which is loosely received in the associated opening (30).
Figure imgaf001

Description

Die Erfindung bezieht sich auf eine Radialdichtung für Kreiskolbenmotoren mit einer inneren Lauffläche und einem mehreckigen Kolben, in dessen Ecken jeweils eine sich ra­dial und axial erstreckende Nut zur verschiebbaren Aufnah­me einer mit ihrer Oberkante gegen die Lauffläche zur An­lage bringbaren Dichtleiste eingearbeitet ist, die minde­stens eine in Umfangsrichtung offene Durchbrechung auf­weist, in der ein Füllstück eingesetzt ist.The invention relates to a radial seal for rotary piston engines with an inner running surface and a polygonal piston, in the corners of which a radially and axially extending groove for displaceably receiving a sealing strip which can be brought into abutment with the upper edge against the running surface and which has at least one in Has peripheral opening in which a filler is inserted.

Bei dieser bekannten Radialdichtung (DE-A1-36 29 654) wird das Füllstück über eine Feder stets gegen die Oberkante der Unterbrechung gedrückt, wobei bei Druckbeaufschlagung zum Beispiel von der vorlaufenden Arbeitskammer her das Füllstück gegen die unterdruckseitige Wand der Nut gepreßt wird und somit eine Ventilwirkung entstehen soll. Danach soll die eine größere Masse aufweisende Dichtleiste gegen die unterdruckseitige Wand der Nut verschoben werden. Hier­durch wird aber der Reibkontakt der Dichtleiste an der Nu­tenwand erhöht, wodurch ein schnelles radiales Verschieben der Dichtleiste zumindest erschwert und die Dichtleistung vermindert wird.In this known radial seal (DE-A1-36 29 654), the filler is always pressed against the upper edge of the interruption via a spring, the presser being pressed against the vacuum-side wall of the groove, for example, from the leading working chamber when pressurized, and thus a Valve effect should arise. Then the sealing strip, which has a larger mass, is to be displaced against the vacuum-side wall of the groove. As a result, however, the frictional contact of the sealing strip on the groove wall is increased, as a result of which rapid radial displacement of the sealing strip is at least made more difficult and the sealing performance is reduced.

Die mit der Erfindung zu lösende Aufgabe wird darin gese­hen, den Gasdruck, der bei der Druckbeaufschlagung auf beide Seiten der Dichtleiste einwirkt, zu egalisieren. Diese Aufgabe ist dadurch gelöst worden, daß jedes Füll­stück lose in der zugehörigen Durchbrechung aufgenommen ist. Auf diese Weise kann der Gasdifferentialdruck das oder die Füllstücke in einen Reibdruck oder Reibschluß mit einer der Seitenwände der Nut bzw. Nuten verschieben, wo­durch die anfängliche Ventilwirkung erzielt wird. Infolge des losen Einsatzes der Füllstücke ist dieser Reibkontakt oder Reibschluß jedoch nicht in der Lage, die Radialbewe­gung der Dichtleisten zu behindern oder zu verzögern, so daß im ganzen gesehen eine kontinuierliche und verbesserte Dichtleistung zwischen Kolben und innerer Lauffläche er­reicht ist. Jede Dichtleiste weist mindestens eine Durch­brechung auf, so daß die Seitenflächen der Dichtleisten, die dem Gasdifferentialdruck ausgesetzt sind, verkleinert sind und der Druck an beiden Seiten der Dichtleiste ega­lisiert wird.The object to be achieved with the invention is seen in equalizing the gas pressure which acts on both sides of the sealing strip when pressure is applied. This object has been achieved in that each filler piece is loosely received in the associated opening. In this way, the gas differential pressure can move the filler (s) into a friction pressure or frictional engagement with one of the side walls of the groove or grooves, whereby the initial valve effect is achieved. However, due to the loose use of the filler pieces, this frictional contact or frictional engagement is not able to hinder or delay the radial movement of the sealing strips, so that on the whole a continuous and improved Sealing performance between the piston and the inner tread is achieved. Each sealing strip has at least one opening, so that the side faces of the sealing strips which are exposed to the gas differential pressure are reduced and the pressure on both sides of the sealing strip is equalized.

Um das dem Gasdruck in jeder Nut ausgesetzte Volumen zu verkleinern, wird nach der Erfindung ferner vorgeschlagen, daß jedes Füllstück einen kleineren Reibungskoeffizienten als die zugehörige Dichtleiste aufweist.In order to reduce the volume exposed to the gas pressure in each groove, it is further proposed according to the invention that each filler has a smaller coefficient of friction than the associated sealing strip.

Vorteilhaft kann erfindungsgemäß jede Dichtleiste mehrere mit gegenseitigem Abstand zueinander angeordnete und axial hintereinander liegende Durchbrechungen aufweisen, in de­nen jeweils ein Füllstück lose aufgenommen ist.Advantageously, according to the invention, each sealing strip can have a plurality of openings arranged at a mutual distance from one another and lying axially one behind the other, in each of which one filler piece is loosely received.

In der Zeichnung sind zwei nachfolgend näher erläuterte Ausführungsbeispiele der Erfindung dargestellt. Es zeigt:

  • Fig. 1 die Radialdichtung nach der Erfindung im Querschnitt,
  • Fig. 2 eine Dichtleiste mit mehreren Durchbrechun­gen in Blickrichtung der Pfeile 2 - 2 in Fig. 1 und
  • Fig. 3 eine ähnliche Darstellung wie Fig. 2, je­doch eine Dichtleiste mit nur einer Durch­brechung darstellend.
The drawing shows two exemplary embodiments of the invention which are explained in more detail below. It shows:
  • 1 shows the radial seal according to the invention in cross section,
  • Fig. 2 is a sealing strip with several openings in the direction of arrows 2 - 2 in Fig. 1 and
  • Fig. 3 is a similar representation as Fig. 2, but showing a sealing strip with only one opening.

Ein als Wankelmotor bekannt gewordener Kreiskolbenmotor ist mit einem Gehäuse 10 ausgerüstet, das eine innere Lauf­fläche 12 oder Mantelfläche aufweist und einen Arbeits­raum 14 umschließt. Ein mit drei Ecken ausgerüsteter Kol­ben 16 läuft in dem Arbeitsraum 14 um einen herkömmlichen und der Einfachheit halber nicht dargestellten Exzenter um und ist an jeder Ecke mit einer sich radial und axial er­streckenden Nut 18 versehen, deren Seitenwände mit 20 und 22 bezeichnet sind.A rotary piston engine which has become known as a Wankel engine is equipped with a housing 10 which has an inner running surface 12 or jacket surface and encloses a working space 14. A piston 16 equipped with three corners rotates in the working space 14 around a conventional eccentric, which is not shown for the sake of simplicity and is provided at each corner with a radially and axially extending groove 18, the side walls of which are designated 20 and 22.

Die Nut 18 ist Teil einer Radialdichtung und nimmt eine Dichtleiste 28 mit einem gewissen seitlichen Spiel auf. Letztere ist in der Nut 18 radial verschiebbar, um im Ein­satz dichtend gegen die innere Lauffläche 12 anliegen zu können. Normalerweise erfolgt die Radialbewegung in Rich­tung auf die innere Lauffläche 12 durch den im Arbeitsraum 14 herrschenden und von unten her auf die Dichtleiste 28 einwirkenden Gasdruck und kann durch eine nicht gezeigte Feder noch unterstützt werden. Der höhere Gasdruck in dem jeweiligen Arbeitsraum beaufschlagt dabei eine Seitenflä­che der Dichtleiste und setzt sich fort bis zum Nuten­grund, wodurch das Ausschieben der Dichtleiste erfolgt.The groove 18 is part of a radial seal and receives a sealing strip 28 with a certain lateral play. The latter is radially displaceable in the groove 18 in order to be able to bear against the inner running surface 12 in a sealing manner. The radial movement in the direction of the inner running surface 12 normally takes place due to the gas pressure prevailing in the working space 14 and acting on the sealing strip 28 from below and can also be supported by a spring (not shown). The higher gas pressure in the respective work area acts on a side surface of the sealing strip and continues to the bottom of the groove, as a result of which the sealing strip is pushed out.

Die insbesondere in Fig. 2 dargestellte Dichtleiste 28 weist mehrere mit gegenseitigem Abstand zueinander ange­ordnete Durchbrechungen 30, beispielweise Bohrungen, auf, die sich durch die Dichtleiste 28 in einer Richtung er­strecken, die senkrecht zu den Seitenwänden 20 und 22 ver­läuft, d. h. die Durchbrechungen sind mit Bezug auf die Umlaufrichtung zu beiden Seiten offen und verringern die Seitenfläche der Dichtleiste 28, die dem Gasdifferential­druck ausgesetzt ist. Die Durchbrechungen dienen darüber hinaus dazu, daß Gasdruck von einer Seite der Dichtleiste 28 zu deren gegenüberliegenden Seite gelangen kann, um da­mit sehr schnell den Gasdruck zwischen diesen beiden Sei­ten auszugleichen und um dadurch den Reibkontakt zwischen der Dichtleiste 28 und der jeweiligen Seitenwand 20, 22 der Nut 18 zu verringern. Jede in Fig. 2 dargestellte Durchbrechung 30 nimmt ein lose eingesetztes zylindrisches Füllstück 32 auf, das einen wesentlichen Teil des Volumens einer jeden Durchbrechung 30 ausfüllt und somit das Volu­men reduziert, auf das der Gasdruck einwirken muß. Der Gasdifferentialdruck kann die Füllstücke 32 in einen Reib­ kontakt mit einer der Seitenwände 20 oder 22 der Nut 18 bringen. Jedoch behindert dieser Reibkontakt infolge der losen Füllstücke 32 nicht die Radialbewegung der Dichtlei­sten 28, da dadurch zwischen den Wänden der Durchbrechun­gen 30 bzw. ihren Mantelflächen und den Außenflächen der Füllstücke 32 ausreichend viel Spiel vorhanden ist.The sealing strip 28, shown in particular in FIG. 2, has a plurality of openings 30, for example bores, which are arranged at a mutual spacing from one another and extend through the sealing strip 28 in a direction perpendicular to the side walls 20 and 22, ie the openings are included With respect to the direction of rotation open on both sides and reduce the side surface of the sealing strip 28, which is exposed to the gas differential pressure. The breakthroughs also serve to allow gas pressure from one side of the sealing strip 28 to reach the opposite side thereof, in order to very quickly compensate for the gas pressure between these two sides and thereby to make frictional contact between the sealing strip 28 and the respective side wall 20, 22 of the Groove 18 to decrease. Each opening 30 shown in Fig. 2 receives a loosely inserted cylindrical filler 32 which fills a substantial part of the volume of each opening 30 and thus reduces the volume to which the gas pressure must act. The gas differential pressure can rub the filler pieces 32 Bring contact with one of the side walls 20 or 22 of the groove 18. However, this frictional contact as a result of the loose filler pieces 32 does not hinder the radial movement of the sealing strips 28, since there is a sufficient amount of play between the walls of the openings 30 or their outer surfaces and the outer faces of the filler pieces 32.

In Fig. 3 ist ein weiteres Ausführungsbeispiel für eine Dichtleiste 28 dargestellt, die im Gegensatz zu der Aus­führungsform nach Fig. 2 nur eine einzige große Durchbre­chung 34, beispielsweise in rechteckiger Form, aufweist. In diese ist ein einziges Füllstück 36 mit geringerer Rei­bung ebenfalls lose eingesetzt. Alle Füllstücke 32 oder 34 sind vorzugsweise aus einem Material hergestellt, das einen geringeren Reibungskoeffizienten aufweist als die zugehörige Dichtleiste 28, wie beispielsweise aus Phenol gewonnene Stoffe, Teflon oder Polyamid. Die sich daraus ergebende Radialdichtung hat kleine seitliche Dichtflä­chen, einen geringen seitlichen Reibkontakt und einen Gas­druckausgleich bei einem reduzierten dem Gasdruck ausge­setzten Volumen.FIG. 3 shows a further exemplary embodiment for a sealing strip 28 which, in contrast to the embodiment according to FIG. 2, has only a single large opening 34, for example in a rectangular shape. In this a single filler 36 with less friction is also loosely inserted. All fillers 32 or 34 are preferably made of a material that has a lower coefficient of friction than the associated sealing strip 28, such as substances obtained from phenol, Teflon or polyamide. The resulting radial seal has small lateral sealing surfaces, low lateral frictional contact and gas pressure compensation with a reduced volume exposed to the gas pressure.

Derartige Radialdichtungen sind bei allen mehreckigen Kol­ben einsetzbar.Such radial seals can be used with all polygonal pistons.

Claims (3)

1. Radialdichtung für Kreiskolbenmotoren mit einer inneren Lauffläche (12) und einem mehreckigen Kolben (16), in dessen Ecken jeweils eine sich radial und axial er­streckende Nut (18) zur verschiebbaren Aufnahme einer mit ihrer Oberkante gegen die Lauffläche (12) zur An­lage bringbaren Dichtleiste (28) eingearbeitet ist, die mindestens eine in Umfangsrichtung offene Durchbrechung (30 bzw. 34) aufweist, in der ein Füllstück (32 bzw. 36) eingesetzt ist, dadurch gekennzeichnet, daß jedes Füllstück (32 bzw. 36) lose in der zugehörigen Durch­brechung (30 bzw. 34) aufgenommen ist.1. Radial seal for rotary piston engines with an inner running surface (12) and a polygonal piston (16), in the corners of which each have a radially and axially extending groove (18) for slidably receiving one with its upper edge against the running surface (12) Sealing strip (28) is incorporated, which has at least one opening (30 or 34) open in the circumferential direction, in which a filler piece (32 or 36) is inserted, characterized in that each filler piece (32 or 36) loosely in the associated opening (30 or 34) is added. 2. Radialdichtung nach Anspruch 1, dadurch gekennzeichnet, daß jedes Füllstück (32 bzw. 36) einen kleineren Rei­bungskoeffizienten als die zugehörige Dichtleiste (28) aufweist.2. Radial seal according to claim 1, characterized in that each filler (32 or 36) has a smaller coefficient of friction than the associated sealing strip (28). 3. Radialdichtung nach Anspruch 1, dadurch gekennzeichnet, daß jede Dichtleiste (28) mehrere mit gegenseitigem Ab­stand zueinander angeordnete und axial hintereinander liegende Durchbrechungen (30) aufweist, in denen je­weils ein Füllstück (32) lose aufgenommen ist.3. Radial seal according to claim 1, characterized in that each sealing strip (28) has a plurality of mutually spaced and axially one behind the other openings (30), in each of which a filler (32) is loosely received.
EP90102257A 1989-02-13 1990-02-06 Radial sealing Expired - Lifetime EP0383143B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US309509 1989-02-13
US07/309,509 US4931001A (en) 1989-02-13 1989-02-13 Apex seal with filled aperture

Publications (3)

Publication Number Publication Date
EP0383143A2 true EP0383143A2 (en) 1990-08-22
EP0383143A3 EP0383143A3 (en) 1991-02-27
EP0383143B1 EP0383143B1 (en) 1992-04-15

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EP90102257A Expired - Lifetime EP0383143B1 (en) 1989-02-13 1990-02-06 Radial sealing

Country Status (5)

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US (1) US4931001A (en)
EP (1) EP0383143B1 (en)
JP (1) JPH02241927A (en)
CA (1) CA2008711A1 (en)
DE (1) DE59000082D1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19935234C1 (en) * 1999-07-28 2000-11-09 Mannesmann Sachs Ag Sealing rail for rotary piston engine has packing piece provided with sealing body divided into 2 parallel halves acted on by spring element with separation element between them

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1151992B (en) * 1960-08-12 1963-07-25 Daimler Benz Ag Radial seal for rotary and rotary piston machines
DE1154316B (en) * 1961-05-12 1963-09-12 Daimler Benz Ag Radial seal for rotary piston machines
US3261334A (en) * 1962-12-11 1966-07-19 Nsu Motorenwerke Ag Lubricating sealing structure for rotary mechanisms

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1223614B (en) * 1962-03-31 1966-08-25 Nsu Motorenwerke Ag Radial seal for pistons of rotary piston internal combustion engines
GB983025A (en) * 1962-03-31 1965-02-10 Daimler Benz Ag Improvements relating to pistons for rotary-piston internal combustion engines
US3752607A (en) * 1972-03-06 1973-08-14 Gen Motors Corp Rotary machine apex seal
GB1485662A (en) * 1974-04-05 1977-09-14 Ford Motor Co Apex seal in a rotary engine
DE3629654A1 (en) * 1986-08-30 1988-03-10 Wankel Gmbh RADIAL SEAL OF A ROTARY PISTON MACHINE

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1151992B (en) * 1960-08-12 1963-07-25 Daimler Benz Ag Radial seal for rotary and rotary piston machines
DE1154316B (en) * 1961-05-12 1963-09-12 Daimler Benz Ag Radial seal for rotary piston machines
US3261334A (en) * 1962-12-11 1966-07-19 Nsu Motorenwerke Ag Lubricating sealing structure for rotary mechanisms

Also Published As

Publication number Publication date
JPH02241927A (en) 1990-09-26
EP0383143B1 (en) 1992-04-15
CA2008711A1 (en) 1990-08-13
US4931001A (en) 1990-06-05
EP0383143A3 (en) 1991-02-27
DE59000082D1 (en) 1992-05-21

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