US3286912A - Gas-tight sealing device for rotary piston engines - Google Patents

Gas-tight sealing device for rotary piston engines Download PDF

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Publication number
US3286912A
US3286912A US531251A US53125166A US3286912A US 3286912 A US3286912 A US 3286912A US 531251 A US531251 A US 531251A US 53125166 A US53125166 A US 53125166A US 3286912 A US3286912 A US 3286912A
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United States
Prior art keywords
rotary piston
apex
sealing
block
sub
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
Application number
US531251A
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English (en)
Inventor
Tado Hiroshi
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.)
YANNAR DIESEL ENGINE CO Ltd
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YANNAR DIESEL ENGINE CO Ltd
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Publication date
Application filed by YANNAR DIESEL ENGINE CO Ltd filed Critical YANNAR DIESEL ENGINE CO Ltd
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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
    • 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
    • F01C19/10—Sealings for working fluids between radially and axially movable parts

Definitions

  • the present invention relates to a rotary pist-on engine having a ycasing consisting of a central housing and side housings disposed on opposite sides thereof, a rotary shaft extending through the center of the central housing, and a rotary piston of -multi-cornered structure rotatably supported on an eccentric portion of the rotary shaft, and more particularly to a device for sealing gastight the angular portions or corners of the rotary piston in its axial direction.
  • the abovedescribed gastight sealing device comprises an axial ygroove provided at each corner of the rotary piston and an apex sealing means provided in each groove.
  • the iapex sealing means acts to separate the adjacent operating chambers from each other and to maintain a gastight seal between the adjacent operating chambers by being pressed against the inside face of the central housing by the pressure exterted on its bottom yface from the operating chamber Iat higher pressure.
  • the primary object of the present invention is to provide an improvement in the sealing device of the type having -an ⁇ apex sealing means composed of an apex sealing member of thin-walled structure in order to relieve the impact as described above land a support block for the apex sealing member.
  • the support block supporting the -apex sealing member is split into three ⁇ sections in order to minimize ygas leakage that may take place through 4a gap between the inside faces of the side housings and the raxial side faces of the apex sealing means when the engine is operating at low speed or when the axial side faces of the apex sealing means are caused to wear after operation over a long period of time.
  • the sealing device of the invention is so arranged that the apex sealing member is supported solely by the central support block while the side blocks on opposite sides of the central block contact the latter with their slant faces and are urged radially outwardly by a spring disposed in the bottom of the above-described axial groove so that the side blocks can be urged axially outwardly by the reaction force caused by the abovedescribed slant faces to completely seal the gap between the sealing means and the inside faces of the side housings.
  • the sealing action by the apex 3,286,912 Patented Nov. 2.2, 1966 ice sealing means at its axial side faces can be completely effected and thus any lowering of engine output due to gas leakage can be prevented.
  • the important feature of the present invention resides in that the apex sealing function (for peripheral sealing) and the side sealing function (for axial sealing) of the apex sealing means are shared by the apex sealing lmembers and the side blocks respectively, and thus the block divided into three sections by the slant faces can Iatt-ain the respective sealing functions.
  • FIG. 1 is a front elevational View of a corner portion of a rotary piston of a rotary piston engine, illustrating -an embodiment of the apex sealing means :according to the present invention
  • FIG. 2 is la section taken on line II-II in FIG. 1;
  • FIG. 3 is a view similar to FIG. 1, but illustrating another embodiment of the invention.
  • FIG. 4 is a section taken on the line IV--IV in FIG. 3.
  • FIGS. 1 and 2 illustrate one embodiment according to the invention.
  • a groove 5 is provided in an angular or corner portion of a rotary piston 3 rotating in la direction of -arrow within a central housing 1.
  • the groove extends in the axial direction of the rotary piston 3 and contains therein an yapex sealing member 7 and a support block.
  • the support block is yaxially split into three sub-blocks, that is side sub-blocks 31 and ⁇ a central sub-block 33 at slant faces 9 as shown in FIG. 2.
  • the side sub-blocks 31 are urged 'by an apex sealing spring 11 so as to be pressed against the central sub-block 31 from below and at the same time to be surged sidewards to make pressure contact with side housings 17 to eiect the side sealing action.
  • Corner sealing members 13 .and side sealing members 19 are provided on opposite sides of the rotary piston 3 to effect gastight lsealing between the rotary piston 3 and the Side housings 17.
  • Reference numeral 15 resignates a corner sealing spring which urges each corner sealing member 13 towards the side housing 17.
  • the apex sealing member 7 is supported by the central support sub-block 33 by being brought into contact at its root portion with a cut-out portion of the central subblock 33.
  • between the 'bottom of the support block assembly and the axial -groove 5 of the rotary piston 3 urges the side support subblocks 31 radially outwardly, so that the side sub-blocks 31 support t-he central support sub-block 33 thereon and at the same time urge the apex sealing member 7 through the central support sub-block 33 ont-o the inside face of the central housing 1 for sliding contact therewith.
  • a space 35 is provided between the bottom of the cut-out of each side sub-block 31 and the lower end of the yapex sealing member 7, lest the side sub-blocks 31 -should directly contact the apex sealing member 7 to urge the latter radi-ally outwardly.
  • a cavity 10 having an open lower end is provided in the centr-al support sub-block 33 as a common technical means of reducing the weight of the block and for thereby minimizing the force of impact.
  • the sealing means in this embodiment is provided Wit-h an apex sealing member 7 which is composed of two sections of line symmetry.
  • the apex sealing member 7 has an arcuate top end and is fitted in an axial groove 5 in the rotary piston 3 and in an inverted U-shape by being tions of a central support sub-block 33k and by being sup ⁇ ported thereby.
  • the apex sealingV member 7 may -be formed -as ia unitary body of inverted U-shape. i
  • the upper end of the central support sub-.block 33 is slightly spaced by a ⁇ gap 31 from the apex sealing member 7 of thin-walled structure.
  • the gap 21 is such that the apex sealing member 7 may not abut the central sub-block 33 even when it is defiected due to impact. It will be understood that this gap 21 serves to suciently maintain the shock absorbing action .and to preventY gas leakage by virtue 'of its labyrinth effect.
  • a plurality lof axial recesses ⁇ 41 are provided at the upper end of the central support sub-'block 33, and a communication passage'45 extends through the central sub-block; 33 in the radial direction of the rotary piston 3 in order to balance gas pressures in the spaces above the upper end of the apex sealing member V7. This is in yorder to lprevent blow-through of gas which may 'be caused by deformation of the ⁇ apex sealing member 7 due to gas pressure at the upper end of lthe central subblock 33.
  • a conventional'apex sealing means having a support block4 of unitary structure
  • side gaps are progressively enlarged to cause increased'gas leakage therethrough as Vthe support iblock gradually ⁇ wears in its axial direction.
  • the side ⁇ .support sub-blocks are always urged into intimate contact with the inside faces of the side housings by the action of the ⁇ apex sealing spring and the slant faces as described above and act to take the greater portion of the-gastight sealing action of the apex sealing means in its axial direction, with the result thatany Wear that may take place in the side sub-'blocks vdoes not bring forth an increase in the side gaps. Therefore, the inventive apex sealing means shows an improved gastight sealing action during operation of the engine atlow speed and after operation housing, and a Yrotary piston of multicornered structure.
  • said device comprising apex sealing means including an axial groove provided in the corner portion of said rotary piston, an
  • apex sealing member of thin-Walled structure disposed in said groove and having a suitably curved top end
  • a support block for supporting said apex ysealing member in said groove
  • said support block being axially split into three sections tlo form a central sub-block and side sublblocks, on opposite sides of said central sub-block which contactwith each other at theirslant faces, said central sub-block supporting said apex sealing kmember thereon, and a spring disposed yat the-'bottom of said kgroove for urging the lower ends of said side sub-blocks radially outwardly of said rotary piston.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
US531251A 1965-03-11 1966-03-02 Gas-tight sealing device for rotary piston engines Expired - Lifetime US3286912A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1965018652U JPS4218644Y1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1965-03-11 1965-03-11

Publications (1)

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US3286912A true US3286912A (en) 1966-11-22

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Application Number Title Priority Date Filing Date
US531251A Expired - Lifetime US3286912A (en) 1965-03-11 1966-03-02 Gas-tight sealing device for rotary piston engines

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US (1) US3286912A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS4218644Y1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE1526429A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1137514A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3376825A (en) * 1966-01-21 1968-04-09 Ingersoll Rand Co Vane spring
DE2213504A1 (de) * 1971-03-20 1972-10-26 Kawasaki Jukogyo K.K., Kobe, Hyogo (Japan) Dichtungsvorrichtung für einen Luftverdichter
US3716313A (en) * 1969-05-16 1973-02-13 Daimler Benz Ag Rotary piston internal combustion engine
US3745630A (en) * 1970-12-16 1973-07-17 Daimler Benz Ag Method of preassembly and assembly of a multipartite seal
US3761207A (en) * 1971-02-08 1973-09-25 Monark Crescent Ab Sealing means for rotary piston machines
US3785745A (en) * 1970-01-24 1974-01-15 Daimler Benz Ag Sealing bar for a rotary piston internal combustion engine
US3880555A (en) * 1974-01-14 1975-04-29 Gen Motors Corp Corner seal spring for rotary engine
US3936250A (en) * 1974-07-10 1976-02-03 General Motors Corporation Corner seal coil spring arrangement for rotary engine
US3963388A (en) * 1975-01-20 1976-06-15 Caterpillar Tractor Co. Unitary apex seal assembly
US3981643A (en) * 1974-11-29 1976-09-21 General Motors Corporation Rotary combustion engine two-piece apex seal arrangement
US8597006B2 (en) 2011-07-28 2013-12-03 Pratt & Whitney Canada Corp. Apex seal for rotary internal combustion engine
US10344870B2 (en) 2011-07-28 2019-07-09 Pratt & Whitney Canada Corp. Apex seal arrangement for rotary internal combustion engine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5112810U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1974-07-16 1976-01-30
GB2249139A (en) * 1990-09-28 1992-04-29 Techfly Ltd Seal arrangement for a rotary engine
US5224850A (en) * 1990-09-28 1993-07-06 Pie Koh S Rotary device with vanes composed of vane segments

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US723656A (en) * 1899-07-14 1903-03-24 Hugh Thomas Dunn Rotary engine.
US3103920A (en) * 1960-08-04 1963-09-17 Georges Raymond Machines and in particular internal combustion engines having an eccentrically mounted rotor with radial blades slidable therein
US3127095A (en) * 1964-03-31 Froede
US3130900A (en) * 1961-03-08 1964-04-28 Nsu Motorenwerke Ag Sealing structure
US3176909A (en) * 1961-03-11 1965-04-06 Nsu Motorenwerke Ag Sealing structures
US3251541A (en) * 1963-12-20 1966-05-17 Nsu Motorenwerke Ag Sealing construction for rotary mechanisms

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3127095A (en) * 1964-03-31 Froede
US723656A (en) * 1899-07-14 1903-03-24 Hugh Thomas Dunn Rotary engine.
US3103920A (en) * 1960-08-04 1963-09-17 Georges Raymond Machines and in particular internal combustion engines having an eccentrically mounted rotor with radial blades slidable therein
US3130900A (en) * 1961-03-08 1964-04-28 Nsu Motorenwerke Ag Sealing structure
US3176909A (en) * 1961-03-11 1965-04-06 Nsu Motorenwerke Ag Sealing structures
US3251541A (en) * 1963-12-20 1966-05-17 Nsu Motorenwerke Ag Sealing construction for rotary mechanisms

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3376825A (en) * 1966-01-21 1968-04-09 Ingersoll Rand Co Vane spring
US3716313A (en) * 1969-05-16 1973-02-13 Daimler Benz Ag Rotary piston internal combustion engine
US3785745A (en) * 1970-01-24 1974-01-15 Daimler Benz Ag Sealing bar for a rotary piston internal combustion engine
US3745630A (en) * 1970-12-16 1973-07-17 Daimler Benz Ag Method of preassembly and assembly of a multipartite seal
US3761207A (en) * 1971-02-08 1973-09-25 Monark Crescent Ab Sealing means for rotary piston machines
DE2213504A1 (de) * 1971-03-20 1972-10-26 Kawasaki Jukogyo K.K., Kobe, Hyogo (Japan) Dichtungsvorrichtung für einen Luftverdichter
US3880555A (en) * 1974-01-14 1975-04-29 Gen Motors Corp Corner seal spring for rotary engine
US3936250A (en) * 1974-07-10 1976-02-03 General Motors Corporation Corner seal coil spring arrangement for rotary engine
US3981643A (en) * 1974-11-29 1976-09-21 General Motors Corporation Rotary combustion engine two-piece apex seal arrangement
US3963388A (en) * 1975-01-20 1976-06-15 Caterpillar Tractor Co. Unitary apex seal assembly
US8597006B2 (en) 2011-07-28 2013-12-03 Pratt & Whitney Canada Corp. Apex seal for rotary internal combustion engine
US10344870B2 (en) 2011-07-28 2019-07-09 Pratt & Whitney Canada Corp. Apex seal arrangement for rotary internal combustion engine

Also Published As

Publication number Publication date
JPS4218644Y1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1967-10-28
GB1137514A (en) 1968-12-27
DE1526429A1 (de) 1970-04-23

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