US3270954A - Sealing device for rotary piston engine - Google Patents

Sealing device for rotary piston engine Download PDF

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Publication number
US3270954A
US3270954A US431639A US43163965A US3270954A US 3270954 A US3270954 A US 3270954A US 431639 A US431639 A US 431639A US 43163965 A US43163965 A US 43163965A US 3270954 A US3270954 A US 3270954A
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US
United States
Prior art keywords
seal piece
rotor
casing
apex
groove
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
US431639A
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English (en)
Inventor
Yamamoto Kenichi
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.)
Mazda Motor Corp
Original Assignee
Toyo Kogyo Co Ltd
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 Toyo Kogyo Co Ltd filed Critical Toyo Kogyo Co Ltd
Application granted granted Critical
Publication of US3270954A publication Critical patent/US3270954A/en
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
    • F01C19/10—Sealings for working fluids between radially and axially movable parts
    • 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
    • F01C19/005—Structure and composition of sealing elements such as sealing strips, sealing rings and the like; Coating of these elements
    • 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 present invention relates to -a sealing device for a rotary piston internal combustion engine and particularly to a sealing device ⁇ for providing a seal between the apex of a polygonally shaped rotor which rotates within an annular 'casing and .the casing.
  • a polygonally shaped rotor is eccentrically mounted within an annular casing having a trochoidalshaped internal peripheral Wall, and crescent shaped chambers are defined between the rotor and the annular casing which vary in volume, increasing and then decreasing during the eccentric rotational displacement of the rotor within the annular casing as the apexes of the rotor move along the internal face of the casing.
  • the intake and compression of the gas prior to liring it within the chambers and exhaust of the products of .the combustion are performed.
  • An engine having ksuch a lsealing device has been proved to be subject to abnormal wear on the internal trochoidal face of the annular casing and early deterioration of the sealing effect between the apex seal and the internal facefof the casing occurred.
  • the apex seal piece itself must be wear-resistant, rigid and large enough in size and in external ⁇ shape ⁇ so as to be radially slidably held within the groove on the .apex of lthe rotor. It is therefore impossible by 'simply altering the material of the seal piece to enable the apex Iseal to satisfy lal1 of the above requirements, because reducing the mass of the seal piece, regardless of what kind of material is used, inevitably results in making the apex seal smaller in size, and a seal piece of low density material is defective with respect to rigidity and wear resistance.
  • the seal piece is affected by irregular vibration ⁇ and shock during operation of the engine and the inertia force of the seal piece due to such irregular vibration and shock causes irregular frictional contact between the seal piece and the internal annular Wall of the casing and results in abnormal wear on the internal face of the annular casing.
  • FIG. 1 is la cross sectional view of a rotary piston engine showing a rotor provided with apex seal devices;
  • FIG. 2 is 1a side view of an apex seal piece partially in section and on an enlarged scale
  • FIG. 3 is a bottom view of the alpex seal piece of FIG. 2;
  • a triangular rotor 1 is eccentrically rotatably mounted on a crankshaft 2 within an Iannular casing 3 having a .trochoidal shaped internal peripheral wall 4.
  • a y longitudinal groove 6 extending the entire axial length of the rotor, and Within the groove is radially slidably mounted Ian ⁇ apex 'seal piece 7 having a substantially rectangular cross-section and an appropriate length.
  • Said alpex 'seal can be of a material 'such as a special cast-iron group which is Isufliciently strong when subjected to severe heat ⁇ and pressure of la gas explosion.
  • the yapex seal piece body Within the yapex seal piece body are longitudinal holes 8 extending throughout the entire length thereof, one of which holes is in the radially outer portion so as to leave a sliding contact portion 9 of suliicient thickness for withstanding the sliding frictionall force between the seal piece and the internal wall of the ⁇ annular casing. Another one of the holes 8 is in the radially inner portion so as to leave an intermediate wall portion 10 between ⁇ the upper and lower holes 8. Below the lower hole 8 is a bottom portion 11. The lpo'sition of the intermediate wall portion 10 will be determined by the depth of the groove 6 and :the depth ⁇ of the groove 6 should be such that said wall portion 10 will be at a position where the upper edlge portion 12 of the groove 6 is located.
  • the apex seal piece having an external size sutiicient to be slidably mounted Within the ⁇ groove 6 so as to form a seal between the internal Wall face 4 of the -annular casing and the rotor apex 5, h-as its mass reduced by the longitudinal and cross holes 8 and 13 which intersect within the seal piece body.
  • a decrease of the inertia of the seal piece is yalso accomplished by reducing the mass thereof by providing the intersecting holes 8 and 13, so that irregular vibration Iand shock of the seal piece which ⁇ are caused by irregular vibration land shock of the rotor 1 during operation of the ⁇ eng-ine and which act on the seal piece 7 to cause irregular heavy frictional contact of the seal piece with the internal wall face ofthe annular casing 3 are damped, Iand abnormal uneven wear on the inner wall face of the casing 3 is prevented.
  • the apex seal piece 7 slides in the radial direction within the groove 6 under the effect of centrifugal force and a pressing force is exerted on one side of the body by the wall of the groove 6 in the revolving rotor 1.
  • the hollowed out seal piece 7 has its internal strength increased by the bridges 14 which are integral with the seal piece body and disposed within the hollow seal piece body at proper intervals.
  • FIG. shows a modified form of the seal piece in which there is only one longitudinal hole 8 which is positioned above, or radially outwardly of, the position of the upper edge of the groove 6.
  • the solid bottom portion 11 below the longitudinal hole 8 has a radial dimension which substantially corresponds with the depth of the groove 6 so that the portion of the seal piece held by the groove 6 is sufliciently strong and rigid to Withstand the force of the groove wall during operation of the engine.
  • a vertical or radially extending cross hole 13 can be positioned in an appropriate middle portion and intersect with the longitudinal hole 8.
  • a rotor and sealing device for a rotary piston internal combustion engine having an annular casing with a trochoidal shaped internal peripheral wall and a crankshaft within said casing for eccentrically rotating a rotor within said casing, comprising a triangular rotor adapted to be eccentrically rotatably mounted on the crankshaft for rotation within the annular casing, said rotor having an axially extending Igroove at each apex thereof, an apex seal piece radially slidably mounted in each groove,
  • each apex seal piece having a pair of longitudinally extending bores therethrough, one adjacent the radially outward edge of the seal piece and leaving between said one bore and the radially outward edge a frictional sliding contact portion of sufficient thickness for withstanding the sliding frictional forces of the seal piece on the nternal wall of the casing, said one bore being entirely within the portion of the sealpiece which projects out of the groove, and the other bore being parallel to said one bore and being adjacent the radially inward edge of the seal piece and leaving between said other bore and said radially inward edge a bottom portion and leav- 'mg between said two bores an intermediate wall portion, said other bore being entirely within the portion yof the seal piece within the groove, with the edge of the groove at a position on the seal piece adjacent said intermediate wall portion of the said bores, and a plurality of radially extending holes in said seal piece extending from the edge thereof within the groove through said other bore and into said one bore and spaced at substantially equal intervals along the length of said seal piece
  • a rotor and sealing device for a rotary piston internal combustion engine having an annular casing with a trochoidal shaped internal peripheral wall and a crankshaft within said casing for eccentrically rotating a rotor within said casing, comprising a triangular rotor adapted to be eccentrically rotatably mounted on the crankshaft for rotation within the annular casing, said rotor having an axially extending groove at each apex thereof, an apex seal piece radially slidably mounted in each groove, each apex seal piece having a single longitudinally extending bore therethrough adjacent the radially outwardl edge of the seal piece and leaving between said bore and the radially outward edge a frictional sliding Contact portion of sufficient thickness for withstanding the sliding frictional Vforces of the seal piece on the internal wall of the casing, said bore being entirely within the portion of the seal piece which projects out of the groove with the edge of the groove at a position on the seal piece radially inwardly of the said bore, and a

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressor (AREA)
  • Sealing Devices (AREA)
US431639A 1964-02-17 1965-02-10 Sealing device for rotary piston engine Expired - Lifetime US3270954A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1097364 1964-02-17

Publications (1)

Publication Number Publication Date
US3270954A true US3270954A (en) 1966-09-06

Family

ID=11765084

Family Applications (1)

Application Number Title Priority Date Filing Date
US431639A Expired - Lifetime US3270954A (en) 1964-02-17 1965-02-10 Sealing device for rotary piston engine

Country Status (5)

Country Link
US (1) US3270954A (de)
DE (1) DE1451844B1 (de)
FR (1) FR1424140A (de)
GB (1) GB1076501A (de)
SE (1) SE319780B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US3832104A (en) * 1969-05-07 1974-08-27 Daimler Benz Ag Rotary piston internal combustion engine
US3981644A (en) * 1974-02-01 1976-09-21 Daimler-Benz Aktiengesellschaft Sealing strip particularly for rotary engines
US4735560A (en) * 1987-02-25 1988-04-05 Larry Wydra Seal assembly for a rotary device

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR409669A (de) *
US1114046A (en) * 1914-08-24 1914-10-20 Amandus C Roessler Vacuum-pump.
US1805063A (en) * 1928-09-08 1931-05-12 Wrona Casimir Rotary pump
US2070662A (en) * 1934-04-24 1937-02-16 James P Johnson Vacuum pump
US2305317A (en) * 1938-04-09 1942-12-15 Claude H Nickell Rotary compressor
US2423639A (en) * 1945-03-15 1947-07-08 Eddington Metal Specialty Comp Rotary pump
US2902980A (en) * 1956-04-26 1959-09-08 Elmer G Barrett Rotary motor and radial sliding vane therefor
US3180564A (en) * 1962-07-02 1965-04-27 Goetzewerke Radial seal for rotary piston engines
US3185387A (en) * 1962-03-31 1965-05-25 Nsu Motorenwerke Ag Apex sealing means

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR590085A (fr) * 1924-12-08 1925-06-10 Procédé d'équilibrage des efforts, dûs à la pression interne, agissant à l'extrémité des palettes d'étanchéité des machines rotatives
DE673233C (de) * 1935-08-25 1939-03-18 James Pontus Johnson Drehkolbenpumpe mit in axialen Zapfen gelagertem Laeufer und radial und gleitend angeordneten Fluegeln
FR1281913A (fr) * 1960-10-11 1962-01-19 Renault Segments pour moteurs rotatifs
US3481091A (en) * 1968-03-04 1969-12-02 Hueco Sa Floor beam construction utilizing post-stressed beams formed of an assembly of hollow elements

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR409669A (de) *
US1114046A (en) * 1914-08-24 1914-10-20 Amandus C Roessler Vacuum-pump.
US1805063A (en) * 1928-09-08 1931-05-12 Wrona Casimir Rotary pump
US2070662A (en) * 1934-04-24 1937-02-16 James P Johnson Vacuum pump
US2305317A (en) * 1938-04-09 1942-12-15 Claude H Nickell Rotary compressor
US2423639A (en) * 1945-03-15 1947-07-08 Eddington Metal Specialty Comp Rotary pump
US2902980A (en) * 1956-04-26 1959-09-08 Elmer G Barrett Rotary motor and radial sliding vane therefor
US3185387A (en) * 1962-03-31 1965-05-25 Nsu Motorenwerke Ag Apex sealing means
US3180564A (en) * 1962-07-02 1965-04-27 Goetzewerke Radial seal for rotary piston engines

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3832104A (en) * 1969-05-07 1974-08-27 Daimler Benz Ag Rotary piston internal combustion engine
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
US3981644A (en) * 1974-02-01 1976-09-21 Daimler-Benz Aktiengesellschaft Sealing strip particularly for rotary engines
US4735560A (en) * 1987-02-25 1988-04-05 Larry Wydra Seal assembly for a rotary device

Also Published As

Publication number Publication date
FR1424140A (fr) 1966-01-07
DE1451844B1 (de) 1970-04-09
SE319780B (de) 1970-01-26
GB1076501A (en) 1967-07-19

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