US3894820A - Sealing devices for rotors of rotary piston engines - Google Patents

Sealing devices for rotors of rotary piston engines Download PDF

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Publication number
US3894820A
US3894820A US401606A US40160673A US3894820A US 3894820 A US3894820 A US 3894820A US 401606 A US401606 A US 401606A US 40160673 A US40160673 A US 40160673A US 3894820 A US3894820 A US 3894820A
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United States
Prior art keywords
drum
rotor
bar
rotary piston
radially
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
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US401606A
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English (en)
Inventor
Michel Durin
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Automobiles Citroen SA
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Automobiles Citroen SA
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Publication date
Application filed by Automobiles Citroen SA filed Critical Automobiles Citroen SA
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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
    • F01C19/06—Radially-movable sealings for working fluids of resilient material

Definitions

  • the sealing device comprises a central bar and two angular segments mounted end to end in a groove situated along each crest of the rotor. Each groove is formed in the rotor at the level of the bar and in a drum sliding at the level of each segment.
  • a spring exerts a centrifugal radial force on the segments, the bar and each segment are in contact through oblique support surfaces and stop surfaces are provided between each segment and each drum to transmit to the latter the axial component, due to the said oblique surfaces, of the total radial force of the spring.
  • the invention relates to scaling devices for prismatic rotors of rotary piston engines, which are constituted by a central bar and by two angular segments mounted end to end in a groove situated along each crest of the rotor, this groove being formed in the rotor or in part rigidly fixed to the rotor at the level of the central bar, and in a drum at the level of each angular segment, each drum being guided, in a housing formed in the rotor, so as to be slidable without rotating parallel to the crest of the rotor, and elastic means being provided to urge, on one hand, the central bar, and the angular segments radially outward, and, on the other hand, each of the drums axially in the direction which spaces it from the middle transverse plane of the rotor.
  • prismatic rotors have, in profile, the shape of a curvilinear polygon, and more particularly of a cur vilinear triangle, and the generators of the rotors which pass through the apices of this polygon are called crests.”
  • the drum and their housings have generally, for reasons of machining, a cylindrical shape, but this shape can also be prismatic.
  • such a rotor is intended to be mounted in an envelope whose transverse inner surface has a tro choidal profile and it limits, with this inner surface, combustion chambers of variable volume, which must remain separated from one another by the above said sealing devices, whatever the degree of wear of the latter. ln being urged radially outwrads, not only by the abovesaid elastic means but also by centrifugal force and possibly by the pressure existing in the combustion chambers, the central bar and the crest segments mounted along each crest are held in contact with the transverse inner surface of the envelope, along a continuous line.
  • the drums are held in contact by flat surfaces with the lateral inner surfaces of the envelope (surfaces perpendicular to the axis of the motor shaft or output shaft), which completes laterally the radial sealing action of the bar and of the angular segments which flank it.
  • the elastic means of the first type have the effect of radially urging the central bar and the angular segments.
  • the elastic means of the second type have the effect of axially urging each bar and are generally constituted by a spring having the shape of a flat yoke of small thickness about 0.2 mm surrounding the crest segment, the spring being placed between the surface of each drum opposite that which cooperates with the lateral surface of the envelope and the bottom of the housing wherein this drum is guided.
  • the sealing device defined above comprises elastic means arranged to exert a centrifugal radial force on the angular segments, the central bar and its angular segment being in mutual contact through oblique support surfaces such that the abovesaid centrifugal radial force is manifested on the angular segment concerned, by an axial component tending to space it from the abovesaid middle transverse plane, and is characterized by the fact that stop surfaces are provided between this angular segment and the drum associated therewith to transmit to the latter said axial component.
  • each angular segment on its surface bearing on the lateral surface of the envelope, is manifested by a movement of this segment towards said surface, hence by a constant thrust of the stop surfaces on the corresponding drum, of which the wear is thus automatically compensated.
  • the simultaneous contact of the lateral surface of the envelope with, on the one hand, the outer surface in the axial direction of the drum, and, on the other hand, the corresponding surface of the angular segment is ensured, when the stop surfaces of these two latter elements touch, by machining previously these two surfaces at the same time, after having assembled for this operation the drum and the angular segment in a mutual contact position identical with that of their opera tion.
  • the abovementioned stop surfaces are constituted by shoulders which form a body with each angular segment, thereby projecting into the housing of the drum on both sides of the middle radial plane of said segment, and through one surface of the drum opposite through which it enters into sealing contact with the lateral surface of the envelope.
  • the stop surfaces concerned are constituted by the cross-section of the angular segment and by the bottom of the groove which is formed radially in a surface of the drum which is opposite that through which it enters into sealing contact with the lateral surface of the envelope.
  • FIGS. 1 and 2, of these drawings show partially a sealing device according to a first embodiment of the invention, respectively in section through a plane passing approximately through the axis of the drive shaft and in section through a plane perpendicular to the foregoing one.
  • FIG. 3 shows separately in perspective the central bar and the two angular segments of the sealing device FIGS. 1 and 2.
  • FIG. 4 shows in perspective, on a larger scale, one of the two angular segments belonging to a sealing device according to a second embodiment of the invention.
  • FIGS. 5 and 6 show separately in perspective, on a larger scale still, one of the two angular segments and the corresponding drum which belong respectively to two sealing devices according to a third and to a fourth embodiment of the invention.
  • the prismatic rotor I of a rotary piston engine, is housed inside an envelope 2 bounded internally by a transverse surface 3 of troehoidal profile and by two lateral surfaces 4.
  • the transverse surface 3 is defined by generators parallel to the axis of the outward shaft not shown of the engine.
  • the lateral surfaces 4 are flat and perpendicular to this outward shaft and are generally borne respectively by attached flanges.
  • the rotor 1 comprises sealing devices which are each constituted by a central bar 5 and by two angular segments 6 mounted end to end in a groove 7 situated along each crest of the rotor l.
  • Groove 7 is formed in the rotor l or in the part rigidly fixed to the latter at the level of the central bar 5 and in the drum 8 at the level of each angular segment 6.
  • Each drum is guided, in a housing 9 formed in the rotor 1, so as to be slidable without rotating parallel to the crest of the rotor.
  • Elastic means which will be more explicitly disucssed below, are provided to urge, on one hand, the central bar 5 and the crest segments 6 radially outwardly, that is to say towards the surface 3, and on the other hand, each of the drums 8 axially in the direction which spaces it from the middle transverse plane of the rotor plane not shown, situated to the right of FIGS. I and 2), that is to say in the direction which tends to apply its terminal flat surface 10 against the neighbouring lateral surface 4 of the envelope 2.
  • each sealing device constructed according to the invention the abovesaid elastic means are arranged to exert a centrifugal radial force on the angular segments 6, the central bar 5 and each angular segment 6 are in mutual contact through oblique support surfaces 50 and 60 such that the abovesaid centrifugal radial force is manifested on the angular segment concerned 6 by an axial component tending to space it from the abovesaid middle transverse plane that is to say to push it towards the left in FIGS. 1 and 2) and stop surfaces are provided between this angular segment 6 and the drum 8 associated with to transmit to the latter the said axial component.
  • the oblique support surfaces 5a of the central bar 5 and 6a of the angular segments 6 are flat and each pair of support surfaces is situated in a plane inclined in such a way that by approaching the axis (towards the bottom of FIG 1), it also approaches the abovesaid middle transverse plane towards the right of FIG. 1).
  • the abovesaid elastic means are constituted by a spring strip 1 I incurved so as to be supported in its central portion, on the portion of the groove 7 formed in the rotor l and, at its two ends, on the respective inner surfaces in the radial direction of the angular segment 6.
  • each angular segment can comprise a projection 6b adapted to prevent the spring strip 11 from being moved axially in the groove 7, the shape of the latter being such that it prevents this strip from pivoting on an axis parallel to the crest of the rotor I.
  • each shoulder 12 possesses the support surface 14 which cooperates by abutment with the surface 13 of the drum 8.
  • each shoulder has a triangular profile limited by an oblique surface 15 which is situated in the same plane as the above mentioned oblique support surfaces 6a.
  • the embodiment of FIG. 4 only differs from the foregoing one by the rectangular profile of the shoulders, the oblique surface 15 being replaced by surface 15a parallel to the support surface 14.
  • the two embodiments have the common feature that the bottom of the groove 7 is situated approximately at the same level on the rotor l and on the drum 8 (as is seen on FIG. 1) and that this groove opens on the sealing surface 10 of each drum 8.
  • On the lateral surface 4 of the envelope are supported not only this sealing surface l0 but also a coplanar surface 16 belonging to the neighbouring angular segment 6.
  • stop surfaces are constituted by the crosssectional surfaces 6c or 6d of the angular segments 6, and by the bottom 17a ofa groove 17 which is formed radially in one surface of the drum 8 which is opposite its sealing surface 10.
  • the two latter embodiments only differ between themselves by the fact that, in FIG. 5, the bottom 17a of the radial groove 17 extends over the whole of the radial dimension of the drum 8 whilst, in FIG. 6, the bottom 17a is interrupted by intersection with an axial groove I8 that is to say parallel to the axis of the engine), formed on the portion of the drum furthest away from the axis of the drive shaft.
  • the above mentioned support 16 is placed at the end of an appendage 19 which bears internally on the periphery of the drum.
  • the support surface 16 is placed at the end of an appendage 20, which is engaged in the radial groove I8 and which, for this reason, is higher (in the radial direction) and, consequently, more robust than in the foregoing case.
  • a strip spring similar to that which is denoted by 11 in FIG. 1, acts through its ends, on the lower surface 21 in FIGS. 5 and 6) of the angular segments 6, these ends being, preferably, curved and ending close to the bottom 17a of the radial groove 17.
  • each drum/angular segment pair To adjust each drum/angular segment pair, they are placed in the mutual position that they must occupy on the rotor, that is to say by placing their stop surfaces I3, 14 or 60 (6d), 17a, in contact, then their sealing surfaces 10, 16 are simultaneously machined with the corresponding lateral surface 4 of the envelope.
  • the spring I] urges radially outwardly the angular segments 5 by direct action and the central bar 5 by the play of the oblique support surfaces 5a, 6a.
  • the wear of each angular segment 6, on its sealing surface 16, causes its radial displacement under the effect of spring I I.
  • the radial force exerted by the spring is manifested by an axial thrust applied directly on the angular segment 6 and, through stop surfaces l3, 14 or 60 (6d), 170, on the drum 8 whose wear is thus automatically compensated.
  • each drum positioned in each housing so as to be slidable axially of but not rotatable relative to the apex of the rotor.
  • each drum having an aubtment surface
  • central bar and said end bars being positioned in said groove with one bevelled end of the central bar lying in facing abutment with the bevelled end of one of the end bars and the other bevelled end of the central bar lying in facing abutment with the bevelled end of the other one of the end bars,
  • each end bar is a surface on each one of a pair of shoulders thereof which project transversely from each side of the bar at a radially inner portion thereof, and
  • each drum is opposite to that through which the drum is adapted to sealingly contact a lateral surface of an envelope of the engine.
  • said elastic means comprises an incurved spring strip the central portion of which contacts the central portion of the groove in the rotor and each end of which contacts the radially inner surface of a respective one of the end bars.
  • each end bar comprises a radially inwardly extending projection adapted to prevent the spring strip from moving axially in the groove, said projection being shaped so as to prevent the spring strip from pivoting about an axis parallel to the apex of the rotor.
  • each drum means defining a radially extending groove in the surface of each drum which is opposite to the surface thereof through which the drum is adapted to sealingly contact a lateral surface of the envelope of the engine, the bottom of the groove in each drum defining its said abutment surface, and the abutment surface of each end bar is a crosssectional surface adjacent an end thereof which is opposite said one end thereof.
  • each of said end bars comprises an appendage which extends axially away from the central bar, the end surface of each appendage is adapted to contact a respective one of the lateral surfaces of the envelope of the engine, and the radially inner surface of each appendage bears radially inwardly against the periphery of its respective drum.
  • each of said end bars comprises an appendage which extends axially away from the central bar, and each of said appendages is positioned in the axially extending groove of a respective one of the drums, and the end surface of each appendage is adapted to contact a respective one of the lateral surfaces of the envelope of the engine.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing Devices (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
US401606A 1972-10-02 1973-09-28 Sealing devices for rotors of rotary piston engines Expired - Lifetime US3894820A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7234824A FR2201718A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1972-10-02 1972-10-02

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US3894820A true US3894820A (en) 1975-07-15

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US401606A Expired - Lifetime US3894820A (en) 1972-10-02 1973-09-28 Sealing devices for rotors of rotary piston engines

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US (1) US3894820A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS504408A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
ES (1) ES418430A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2201718A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1438850A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IT (1) IT997247B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3981643A (en) * 1974-11-29 1976-09-21 General Motors Corporation Rotary combustion engine two-piece apex seal arrangement
CN110469424A (zh) * 2019-09-09 2019-11-19 北京理工大学 一种转子发动机的顶端密封结构

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5647179A (en) * 1979-09-26 1981-04-28 Pioneer Electronic Corp Forced image receiver and its answering device in catv system
JPS60114039A (ja) * 1983-11-25 1985-06-20 Furomu Gareeji:Kk 情報伝達活性化方式
JPS62178029A (ja) * 1986-01-31 1987-08-05 Nippon Telegr & Teleph Corp <Ntt> 有線放送サ−ビスシステム

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2690166A (en) * 1951-04-10 1954-09-28 Shore Benjamin Rotary internal-combustion engine
US3127095A (en) * 1964-03-31 Froede
US3400691A (en) * 1966-07-21 1968-09-10 Curtiss Wright Corp Seal construction for rotary combustion engines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3127095A (en) * 1964-03-31 Froede
US2690166A (en) * 1951-04-10 1954-09-28 Shore Benjamin Rotary internal-combustion engine
US3400691A (en) * 1966-07-21 1968-09-10 Curtiss Wright Corp Seal construction for rotary combustion engines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3981643A (en) * 1974-11-29 1976-09-21 General Motors Corporation Rotary combustion engine two-piece apex seal arrangement
CN110469424A (zh) * 2019-09-09 2019-11-19 北京理工大学 一种转子发动机的顶端密封结构

Also Published As

Publication number Publication date
ES418430A1 (es) 1976-03-16
IT997247B (it) 1975-12-30
DE2349471B2 (de) 1977-06-16
JPS504408A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1975-01-17
FR2201718A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-04-26
GB1438850A (en) 1976-06-09
DE2349471A1 (de) 1974-04-04

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