EP0383143A2 - Etanchéité radiale - Google Patents

Etanchéité radiale Download PDF

Info

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
Authority
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
Other languages
German (de)
English (en)
Other versions
EP0383143B1 (fr
EP0383143A3 (fr
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Deere and Co, Rotary Power International Inc filed Critical Deere and Co
Publication of EP0383143A2 publication Critical patent/EP0383143A2/fr
Publication of EP0383143A3 publication Critical patent/EP0383143A3/fr
Application granted granted Critical
Publication of EP0383143B1 publication Critical patent/EP0383143B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing Devices (AREA)
  • Braking Arrangements (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
EP90102257A 1989-02-13 1990-02-06 Etanchéité radiale Expired - Lifetime EP0383143B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/309,509 US4931001A (en) 1989-02-13 1989-02-13 Apex seal with filled aperture
US309509 1994-09-22

Publications (3)

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

Family

ID=23198519

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90102257A Expired - Lifetime EP0383143B1 (fr) 1989-02-13 1990-02-06 Etanchéité radiale

Country Status (5)

Country Link
US (1) US4931001A (fr)
EP (1) EP0383143B1 (fr)
JP (1) JPH02241927A (fr)
CA (1) CA2008711A1 (fr)
DE (1) DE59000082D1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19935234C1 (de) * 1999-07-28 2000-11-09 Mannesmann Sachs Ag Dichtungsleiste

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1151992B (de) * 1960-08-12 1963-07-25 Daimler Benz Ag Radialdichtung fuer Dreh- und Kreiskolbenmaschinen
DE1154316B (de) * 1961-05-12 1963-09-12 Daimler Benz Ag Radialdichtung fuer Rotationskolbenmaschinen
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
GB983025A (en) * 1962-03-31 1965-02-10 Daimler Benz Ag Improvements relating to pistons for rotary-piston internal combustion engines
DE1223614B (de) * 1962-03-31 1966-08-25 Nsu Motorenwerke Ag Radialdichtung fuer Kolben von Rotationskolben-Brennkraftmaschinen
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 (de) * 1986-08-30 1988-03-10 Wankel Gmbh Radialdichtung einer rotationskolbenmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1151992B (de) * 1960-08-12 1963-07-25 Daimler Benz Ag Radialdichtung fuer Dreh- und Kreiskolbenmaschinen
DE1154316B (de) * 1961-05-12 1963-09-12 Daimler Benz Ag Radialdichtung fuer Rotationskolbenmaschinen
US3261334A (en) * 1962-12-11 1966-07-19 Nsu Motorenwerke Ag Lubricating sealing structure for rotary mechanisms

Also Published As

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

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