US3797974A - Packing strip arrangement for rotary piston engines - Google Patents

Packing strip arrangement for rotary piston engines Download PDF

Info

Publication number
US3797974A
US3797974A US00264486A US3797974DA US3797974A US 3797974 A US3797974 A US 3797974A US 00264486 A US00264486 A US 00264486A US 3797974D A US3797974D A US 3797974DA US 3797974 A US3797974 A US 3797974A
Authority
US
United States
Prior art keywords
sealing
packing
sealing ring
engine
accordance
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
US00264486A
Other languages
English (en)
Inventor
F Huf
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.)
Dornier System GmbH
Original Assignee
Dornier System GmbH
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 Dornier System GmbH filed Critical Dornier System GmbH
Application granted granted Critical
Publication of US3797974A publication Critical patent/US3797974A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

Definitions

  • sealing element means starting from said sealing ring means, extending radially in the direction to the contracted points, and directly adjoining the radial packing strips at the outer ends thereof,
  • the present invention relates to an arrangement of packing strips for-rotary piston engines having trochoidal piston rotors and a housing shaped according to the outer envelope curve and, respectively, the equidistant curve path thereof.
  • the axial packing strips which are disposed equidistantly with respect to the trochoid in grooves of the lateral piston rotor wall along the piston edge or border are very difficult to make.
  • a multi-curved trochoid is considered, for example a configuration which resembles the cloverleaf shape, as shown in the afore-mentioned French Pat. No. 1,277,31 1, it is apparent that the manufacture and processing of the packing strip bed involves considerable problems.
  • the packing strip be inserted relatively movably within the packing strip bed thereof so that it be possible to compensate for states of stress which are produced by the varying temperatures and gas pressures.
  • packing strips with multiple curvatures being complicated are very difficult to make from a material that is particularly suitable for packing strips, such as a cast iron alloy and the like.
  • the packing strips being disposed at the rotating piston rotor assume, due to the centrifugal force, inadmissible states of stress and can, as a result, be clamped-in in the packing strip bed during the operation of the piston and be damaged, thus rendering the packing strip bed unusable after a short running time.
  • the present invention is based on the concept of providing a packing strip arrangement for rotary piston engines with a trochoidal piston rotor and the coordianted housing corresponding to the outer envelope curve with respect to the trochoid, which eliminates leaky transition points from the radial to the axial part of the packing strips. It is a further object of the present invention that-an influencing of the packing strips because of the centrifugal force is largely prevented, and an automatic re-adjustment of the packing strips should be possible.
  • This object is obtained in that, in the two lateral housing walls within the inner envelope curve described by the piston edge, there is provided ineach case a sealing ring closed within itself, and starting therefrom sealing elements extending radially in the direction to the contracted points, which sealing elements adjoin at the outer ends thereof directly to the radial packing strips being disposed at the contracted point, and that at the abutment area of the sealing ring and the sealing element outside of the sealing ring transition members are provided for which, on the one hand, come to rest against and make contact with this sealing ring in an arched or curved manner and, on the other hand, guide the sealing element in a radial direction.
  • the sealing ring be disposed so as to extend equidistantly with respect to the inner envelope curve.
  • the sealing ring also, however, may be advantageously provided in a circular shape.
  • This packing strip arrangement is usable for any type of construction of rotary piston engines with a trochoidal piston rotor.
  • the intermediate pieces or elements with the curved portions thereof enclose the sealing ring in its entirety.
  • the various transition members extend respectively between two successive sealing elements leading to the contracted portions of the housing.
  • This packing strip arrangement assures primarily that the packing strip fault is eliminated and that a completely closed sealing border is present in the axial and the radial direction.
  • the sealing or packing strips are all accommodated in the static part,
  • FIG. 1 illustrates a packing'strip arrangement in the lateral housing wall of a rotary piston engine being provided with a two-curved outer envelope curve
  • FIG. 2 illustrates a packing strip arrangement in the lateral housing wall of a rotary piston engine being provided with a three-curved outer envelope curve
  • FIG. 3 is a longitudinal cross-sectional view of FIG. 1;
  • FIG. 4 illustrates a sealing ring with adjacent sealing elements
  • FIG. 5 is a side view of FIG. 4;
  • FIGS. 6 and 7 illustrate modified embodiments of FIG. 5
  • FIG. 8 illustrates the provision of the transition from the sealing ring to the sealing element
  • FIG. 9 illustrates the provision of the contact point of the sealing element with respect to the radial packing strip
  • FIGS. 10 and 11 illustrate provisions of the transition pieces with the use of a three-curved and, respectively, four-curved outer envelope curve.
  • FIG. 1 illustrates a packing strip arrangement in the direction of view toward a lateral housing wall of a rotary piston engine formed with a two arched outer envelope curve.
  • the outer envelope curve 9 representing the stator, and a trochoidal form 16, representing the rotor, are drawn in with thin lines.
  • the inner envelope curve 10 is indicated in phantom.
  • the radial packing strips 4 are mounted in a manner known per se.
  • a sealing ring 1 is inserted in the lateral housing wall within the inner envelope curve 10, which has been designated in phantom, but outside of the indicated geartooth system 11. It extends here, for example, equidistantly with respect to the inner envelope curve 10.
  • sealing elements 2 are continued in the same plane. i.e., in the lateral housing wall. Disposed adjacent thereto are the radial packing strips 4, shown in this figure, which constitute the transition to the oppositely-positioned housing wall. Also provided between the sealing ring 1 and the sealing elements 2 and. respectively, the radial packing strips 4 are pairs of transition pieces or elements 3 which come to be positioned, on the one hand, along the sealing elements 2 in the direction toward the radial packing strips 4 and, on the other hand, rest on or against the sealing ring 1 in a curved or arched manner in a certain area.
  • FIG. 2 illustrates in a similar manner the arrangement I curved outer envelope curve 9, representing the stator, and a trochoidal form 16, representing the rotor.
  • the sealing ring 1 in the form of the known constant-diameter lobed cylinder. It is essential that the sealing ring 1 is positioned outside of the geartooth system 11 and within and at least approximately equidistantly with respect to the inner envelope curve (which has not been shown in this figure).
  • the sealing ring also could be provided circular, and disposed concentrically with respect to the gear tooth part 11.
  • the sealing elements 2 adjoin or extend in the same plane of the sealing ring 1, and further adjacent thereto, the radial sealing or packing strip 4 establish the transverse connection to the sealing element in the opposite lateral housing wall.
  • FIG. 3 is a cross-sectional view through a rotary piston engine according to the type shown in FIGS. 1 and 2. The line of intersection is indicated in FIG. 1 with reference symbols A-A.
  • the center line of the rotary piston engine which may be designated as the center of the eccentric shaft
  • recesses are milled into the lateral wall 6 in such a manner that sealing rings 1 may be inserted thereinto.
  • the sealing elements 2 are equally placed into a specifically provided bed within the housing wall 6 and, in this particular instance, are seated on the sealing ring 1.
  • recesses 8 are disposed in the housing in which compression springs 5 are positioned. These compression springs 5 press the various parts of the packings against the piston rotor (not shown).
  • the housing 7 disposed at the end face, which establishes the connection between the two lateral housing walls 6.
  • recesses 8 Disposed in the housing 7 are in the same fashion recesses 8 with compressed springs 5 placed thereinto, which springs press the radial packing strips 4 disposed at the contracted points against the circumference of the piston rotor (not shown).
  • the transition pieces or elements 3 have been omitted from FIG. 3 so that the position of the sealing elements 2 with respect to the sealing ring 1 could be illustrated more clearly.
  • FIG. 4 illustrates a modified embodiment of FIG. 1 with a circular sealing ring 1. Disposed around this sealing ring I are the transition pieces or elements 3 in a pipe-clamped or sleeve-jointed manner.
  • the transition elements 3 enclose, on the one hand, completely with respectively one half thereof the sealing ring and, on the other hand, constitute with the straight, projecting legs thereof, a guide for the sealing elements 2.
  • FIG. 5 is a side view of FIG. 4.
  • the sealing rings 1 which are joined in the radial direction by the sealing elements 2 are shown in a cross-sectional view.
  • the transition between the sealing ring 1 and the sealing element 2 is so provided that the point of contact of the sealing elements 2 at the sealing ring 1 has the same radius as the sealing ring in such a manner that a sealing contact surface is produced.
  • the radial packing strip 4 connects the two sealing elements 2 with each other.
  • the radial sealing or packing strip 4 is so adapted in the length thereof by means of a selected fit that the sealing elements 2 can rest against the piston rotor (not shown) laterally in a precisely sealing manner.
  • springs 5 have been shown which indicate that from the outside, i.e., from the housing walls, a uniform spring pressure acts upon the packing strips.
  • a dash-dotted line 14 whose function it is to indicate the center line of the radial packing strip which is provided with a semicircular cross-section at the sealing surface thereof.
  • FIGS. 6 and 7 illustrate modified embodiments of the radial packing strip 4 of FIG. 5.
  • the radial packing strip 4 is divided into two parts, namely into the radial packing strips 4a and 4b. by means of a separating section 12 extending diagonally with respect to the longitudinal axis thereof.
  • the separating line or section 12 is disposed approximately in the center of the radial packing strip.
  • the sealing elements 2 adjoin the radial packing strips 4a and 412, respectively.
  • a different type of provision is shown in FIG. 7 as far as the radial packing strip portions 4a and respectively, are concerned.
  • the radial packing strip portion 4a and the sealing element 2a are combined to a single piece or element in an angular fashion.
  • the sealing ring 1 Disposed adjacent thereto at the lower side is the sealing ring 1 in the manner described above.
  • the second radial packing strip portion 4b rests against the separating line or section 12.
  • the radial packing strip portion 4b rests upon the end of the sealing element 2b.
  • the two radial packing strip portions 4a and 4b equally have a semicircular configuration viewed in cross-section on the side thereof facing the piston rotor. It extends from the insideof the sealing element 2a and beyond the further sealing element 2b.
  • This provision has the advantage that the packing strips can automatically become readjusted, i.e., that the natural wear and tear may be compensated for in a simple manner.
  • a loose contact point of the sealing elements 2 with a radial packing strip portion 4a and/or 4b is avoided and replaced by a firm connection.
  • FIG. 8 is a section from FIG. 4 in which a sealing element 2 does not immediately and directly adjoin the sealing ring 1 but is held in a central position by means of springs and/or 5. It is for bridging this point which is produced by the provision of a spring 15 between the sealing ring 1 and the sealing element 2 that the transition pieces 3 are provided for.
  • FIG. 9 illustrates the contact point between the sealing element 2b, shown in FIG. 7, and the adjacent radial packing strip portion 4b. Since, as mentioned hereinabove, the radial packing strip portion 4b is provided in a semi-cylindrical shape with the center line 14 at the contact point of the piston rotor, the adjoining sealing element 2b has the same radius of the semicylinder, but is concave in shape.
  • FIGS. 10 and 11 show a provision of the transition elements with a three-curved and, respectively, fourcurved or arched outer envelope curve.
  • the transition elements enclose the round portion of the sealing ring 1 in its entirety and furthermore rest against the sealing elements 2 at least over a certain length thereof.
  • the transition pieces or elements 3 extend here respectively between two successive sealing elements 2.
  • the sealing ring 1 is positioned outside of the gear-tooth system relative to the eccentric shaft gearing, but is installed within the inner envelope curve in the lateral housing wall 6.
  • the sealing ring 1 may be positioned equidistantly with respect to the inner envelope curve.
  • a sealing ring 1 will expediently be chosen which can be traced back to simple, basic geometric figures, for example the circular shape.
  • a rotary piston engine of trochoidal construction having a trochoidal rotor, a stator having a periphery in the form of an outer envelope curve formed by said rotor during its rotation with a plurality of contracted portions separating said periphery into chambers and end walls, a radially-disposed packing strip in each of said contracted portions of said stator, a sealing ring mounted in each of said end walls, and sealing element means equal in number to the number of packing strips, extending radially from each of said sealing rings and whose outer ends are adapted to contact the inner ends of said packing strips during the rotation of said rotor, the improvement comprising transitional seal means on each side of each'of said sealing elements where said sealing element joins said sealing ring having a curved portion which conforms'to at least a portion of the outer periphery of said sealing ring and a radial portion which contacts and extends along the entire radial dimension of said sealing element and at least a portion of said packing strip, whereby a facing pair

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing Devices (AREA)
  • Hydraulic Motors (AREA)
US00264486A 1971-06-30 1972-06-20 Packing strip arrangement for rotary piston engines Expired - Lifetime US3797974A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2132521A DE2132521B2 (de) 1971-06-30 1971-06-30 Dichtleistenanordnung für Ro tationskolbenmaschinen der Trochoiden bauart

Publications (1)

Publication Number Publication Date
US3797974A true US3797974A (en) 1974-03-19

Family

ID=5812248

Family Applications (1)

Application Number Title Priority Date Filing Date
US00264486A Expired - Lifetime US3797974A (en) 1971-06-30 1972-06-20 Packing strip arrangement for rotary piston engines

Country Status (10)

Country Link
US (1) US3797974A (enrdf_load_stackoverflow)
JP (1) JPS5143123B1 (enrdf_load_stackoverflow)
AT (1) AT322288B (enrdf_load_stackoverflow)
CH (1) CH564679A5 (enrdf_load_stackoverflow)
DE (1) DE2132521B2 (enrdf_load_stackoverflow)
FR (1) FR2144445A5 (enrdf_load_stackoverflow)
GB (1) GB1382132A (enrdf_load_stackoverflow)
IT (1) IT960283B (enrdf_load_stackoverflow)
NL (1) NL7209128A (enrdf_load_stackoverflow)
SE (1) SE375581B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909163A (en) * 1972-12-16 1975-09-30 Dornier System Gmbh Rotary piston engine of trochoidal construction with a follower gearing traveling in guide rods and forcibly effecting the piston movements
US5295814A (en) * 1989-10-04 1994-03-22 Archimedes Associates Inc. Trochoidal rotary piston machine with piston follow-up mechanism
DE102011018346A1 (de) * 2011-04-20 2012-10-25 Paul Andreas Woelfle Rotationskolbenmotor und Abdichtungsverfahren für einen Rotationskolbenmotor
WO2024094295A1 (de) * 2022-11-02 2024-05-10 Pierburg Gmbh Drehkolbenmaschine mit feststehender dichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US638173A (en) * 1899-07-13 1899-11-28 William L Casaday Rotary engine.
US732280A (en) * 1902-04-04 1903-06-30 Benjamin Draper Rotary fluid-pressure engine.
US3193186A (en) * 1960-09-17 1965-07-06 Renault Packings for rotary engines
US3369739A (en) * 1966-04-30 1968-02-20 Kloeckner Humboldt Deutz Ag Rotary piston internal combustion engine, especially circular piston internal combustion engine
US3514236A (en) * 1967-03-13 1970-05-26 Vish Machinno Elektrotechnitch Rotary engine with epicyclic rotor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US638173A (en) * 1899-07-13 1899-11-28 William L Casaday Rotary engine.
US732280A (en) * 1902-04-04 1903-06-30 Benjamin Draper Rotary fluid-pressure engine.
US3193186A (en) * 1960-09-17 1965-07-06 Renault Packings for rotary engines
US3369739A (en) * 1966-04-30 1968-02-20 Kloeckner Humboldt Deutz Ag Rotary piston internal combustion engine, especially circular piston internal combustion engine
US3514236A (en) * 1967-03-13 1970-05-26 Vish Machinno Elektrotechnitch Rotary engine with epicyclic rotor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909163A (en) * 1972-12-16 1975-09-30 Dornier System Gmbh Rotary piston engine of trochoidal construction with a follower gearing traveling in guide rods and forcibly effecting the piston movements
US5295814A (en) * 1989-10-04 1994-03-22 Archimedes Associates Inc. Trochoidal rotary piston machine with piston follow-up mechanism
DE102011018346A1 (de) * 2011-04-20 2012-10-25 Paul Andreas Woelfle Rotationskolbenmotor und Abdichtungsverfahren für einen Rotationskolbenmotor
DE102011018346B4 (de) * 2011-04-20 2012-11-29 Paul Andreas Woelfle Rotationskolbenmotor und Abdichtungsverfahren für einen Rotationskolbenmotor
WO2024094295A1 (de) * 2022-11-02 2024-05-10 Pierburg Gmbh Drehkolbenmaschine mit feststehender dichtung

Also Published As

Publication number Publication date
NL7209128A (enrdf_load_stackoverflow) 1973-01-03
JPS5143123B1 (enrdf_load_stackoverflow) 1976-11-19
SE375581B (enrdf_load_stackoverflow) 1975-04-21
IT960283B (it) 1973-11-20
GB1382132A (en) 1975-01-29
DE2132521B2 (de) 1973-09-13
DE2132521C3 (enrdf_load_stackoverflow) 1974-04-11
FR2144445A5 (enrdf_load_stackoverflow) 1973-02-09
AT322288B (de) 1975-05-12
DE2132521A1 (de) 1973-01-18
CH564679A5 (enrdf_load_stackoverflow) 1975-07-31

Similar Documents

Publication Publication Date Title
US4012180A (en) Rotary compressor with labyrinth sealing
US3764239A (en) Rotary piston engine with trochoidal construction
GB1454687A (en) Rotary piston motors
US3251541A (en) Sealing construction for rotary mechanisms
US3276386A (en) Rotary pumps and motors
US3797974A (en) Packing strip arrangement for rotary piston engines
US3912427A (en) High pressure gear pump
US3758243A (en) Rotary machine apex seal
ES417637A1 (es) Perfeccionamientos en maquinas volumetricas.
US3193189A (en) Seal means for rotary mechanisms
KR0148493B1 (ko) 기어식 유압기계
US4449898A (en) Power transmission
GB1446852A (en) Rotary machines
SE8006954L (sv) Rotationskolvmotor
US3894820A (en) Sealing devices for rotors of rotary piston engines
US3046069A (en) Ring segment seal construction for rotor side faces in rotary positive displacement internal combustion engines
US3781149A (en) Rotary fluid-pressure machines
US3158103A (en) Vane assembly in rotary fluid machines
US3545901A (en) Rotor for rotary piston engines
CA1147368A (en) Seal between three relatively movable bodies, in particular for rotary piston engines
US11421689B2 (en) Pump assembly with sealing protrusion on stator bore portion
GB1358632A (en) Rotors for oscillating-vane type compressors
RU2035625C1 (ru) Роликолопастная двухсекционная гидромашина
US3876347A (en) Gear pump or motor with unitary flexible end seal plate
US3451345A (en) Compression-depression machine having rotary pistons