US3861838A - Rotary piston internal combustion engine, especially of trochoidal construction - Google Patents

Rotary piston internal combustion engine, especially of trochoidal construction Download PDF

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Publication number
US3861838A
US3861838A US269734A US26973472A US3861838A US 3861838 A US3861838 A US 3861838A US 269734 A US269734 A US 269734A US 26973472 A US26973472 A US 26973472A US 3861838 A US3861838 A US 3861838A
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United States
Prior art keywords
sealing bar
piston
internal combustion
combustion engine
bar means
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Expired - Lifetime
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US269734A
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English (en)
Inventor
Heinz Lamm
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Daimler Benz AG
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Daimler Benz AG
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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
    • F01C19/10—Sealings for working fluids between radially and axially movable parts

Definitions

  • ABSTRACT [30] Foreign Application Priority Data A rotary piston internal combustion engine, especially July 9, 1971 Germany 2134227 of "Ochoidal construction, which includes a housing consisting of a housing casing and of lateral parts and [52 US. Cl 418/142, 418/61, 418/144 a Piston that is Provided at its end faces with bar [51] Int. Cl.
  • the present invention relates to a rotary piston internal combustion engine, especially of trochoidal construction with a housing consisting of lateral parts and of a casing and with a piston that is provided at its end faces with bar grooves, into which is inserted respectively an axially movable sealing bar with a sealing bar spring.
  • the present invention is concerned with the task to provide an arrangement for the sealing bars at the piston which in a simple manner is superior compared to the prior art constructions.
  • At least two sealing bars are arranged in a respective bar groove which have mutually different forms and dimensions and/or different types of materials used therewith.
  • the bar groove receives a greater width--as viewed in cross section--by the installation of several sealing bars and therefore can be machined more easily and readily.
  • the required surface quality of the bar groove flanks can be achieved more readily and can be controlled more easily.
  • two sealing bars of identical form and size which are springily supported may be provided in each bar groove according to the present invention.
  • sealing bars adapt themselves well to the bar groove flanks and to one another. They form a labyrinth seal which is gas-tight in an optimum manner and avoids the passing through of gas by way of the oil seal into the oil circulatory system.
  • sealing bars may be arranged in each bar groove, of which the sealing bar disposed on the gas side is constructed narrower in its width--as seen in cross section. Furthermore, the three sealing bars disposed adjacent one another in a bar groove may have mutually different sealing bar widths.
  • two of the three sealing bars arranged adjacent one another in a bar groove may be constructed according to the present invention shorter in their structural height so that during the standstill of the engine only one sealing bar is pressed against the side part or intermediate part of the housing by the spring pressure. After the starting of the engine, all sealing bars receive gas pressure and are then pressed outwardly uniformly.
  • the present invention additionally provides that two sealing bars are guided in a bar groove, of which one sealing bar is constructed of rectangular shape and the other of L- shapeas viewed in cross section-, and that the L shaped sealing bar, in addition to abutting against the axially effective sealing bar spring, abuts against a radially effective sealing bar spring.
  • Another object of the present invention resides in a rotary piston internal combustion engine, especially of trochoidal construction, which is equipped with a sealing bar arrangement at the end faces of the piston that is more favorable in its space requirements than the prior art constructions.
  • a further object of the present invention resides in a rotary piston internal combustion engine, especially of trochoidal construction, which involves a less timeconsuming and a less costly manufacture of the bar grooves for the sealing bars at the end faces of the pistons.
  • Another object of the present invention resides in a sealing bar arrangement in the end faces of the piston of a rotary piston internal combustion engine of trochoidal construction which permits easier manufacture and improved control of the surface quality of the sealing bar groove flanks.
  • a still further object of the present invention resides in a rotary piston internal combustion of trochoidal construction provided with several sealing bars arranged in a bar groove of the end surface of the piston which improves the gas-tightness thereof notwithstanding a saving in space.
  • FIG. 1 is a partial cross-sectional view through a rotary piston internal combustion engine of trochoidal construction equipped with two sealing bars in accordance with the present invention
  • FIGS. 2 to 4 are partial cross-sectional views through three modified embodiments of rotary piston internal combustion engines provided with three sealing bars in a respective bar groove in accordance with the present invention which have mutually different shapes and sizes;
  • FIG. 5 is a partial cross-sectional view through a still further modified embodiment of a rotary piston internal combustion engine of trochoidal construction with two sealing bars and two sealing bar springs each in a respective bar groove according to the present invention.
  • FIG. 6 is a partial cross-sectional view of a rotary piston internal combustion engine of trochoidal construction with the two sealing bars and two sealing bar springs of FIG. disposed in the piston;
  • FIG. 7 is an enlarged viewof the embodiment of FIG. 5 taken in the area designated X in FIG. 6.
  • reference numeral 1 designates in this figure a piston of a rotary piston internal combustion engine, particularly of otherwise conventional trochoidal construction, in which case the piston is of polygonal shape and the housing casing is provided with a multi-arched contact or running surface along which slides the piston with its piston corners as shown in FIG. 6.
  • Bar grooves 2 are arranged in the usual manner at the end faces of the piston 1; two sealing bars 3 disposed adjacent one another and having the same shape and size are thereby elastically supported in each sealing bar groove 2 in accordance with this invention.
  • the sealing bars 3 are pressed against the end face of a lateral part 5 of the housing by a sealing bar spring 4 which extends nearly over the entire width of the two sealing bars 3.
  • the lateral part 5, in case of a multi-disk rotary piston internal combustion engine may also represent an intermediate housing part between adjacent disks of the multi-disk engine.
  • FIG. 2 An embodiment is illustrated in FIG. 2, in which three sealing bars 6, 7, 7 are accommodated in a respective bar groove 2 whereby the sealing bar 6 arranged on the gas side is constructed narrower in width.
  • small chamfers 8as indicated in FIG. 2 through applicable also in all other embodiments may be appropriate at the engaging or contact surface of the sealing bars 6 and 7, which at their points of contact 9 retain a fine oil film also between the individual sealing bars so that, on the one hand, the wear is reduced, and on the other, the gas-tightness is increased.
  • FIG. 3 Three sealing bars 10, 11 and 12 also arranged in one bar groove 2 adjacent one another are illustrated in FIG. 3 which, however, are all constructed different in their respective width. The narrowest and therewith the most flexible sealing bar is disposed on the gas side.
  • the three sealing bars 10, l1 and 12 together are held or engaged by a single sealing bar spring 4as is also indicated in FIG. 2-whereas only one of the three sealing bars 13, 14, 14 arranged in a single bar groove 2 according to FIG. 4 is held by the sealing bar spring 4.
  • the other two sealing bars 14 of FIG. 4 are constructed shorter in their structural height.
  • the two sealing bars 15 and 16 illustrated in FIGS. 5, 7 which are disposed in a single bar groove 2 have different shapes.
  • the sealing bar 15 arranged on the gas side is L-shaped in'cross section and the adjacent sealing bar 16 is constructed rectangularly shaped in cross section.
  • two sealing bar springs 17 and 18 having different pressure or force directions are arranged in the bar groove 2, of which the axially effective spring 17 presses both sealing bars 15 and 16 against the lateral housing part 5 and the radially effective spring 18 presses laterally against the L-shaped sealing bar 15.
  • different materials may be used such as, for example, gray cast iron, bronze, aluminum, ceramics, carbon, steel, synthetic plastic materials, such as, synthetic resinous materials, sintered metals, etc.
  • the sequence of the arrangement of the materials to be used can be different.
  • Sealing bars with different types of materials then run along the same running or contact surface of the lateral or intermediate part.
  • a rotary piston internal combustion engine with a housing including a casing and lateral parts comprising: a piston disposed within said housing, a peripheral groove provided along each end face of said piston, said peripheral groove being provided with two spaced wall portions and a bottom wall portion, one of said wall portions being disposed on the gas side of said piston, at least two axially movable sealing bar means disposed in each of said grooves, a first spring means disposed in a respective peripheral groove between said bottom wall portion and said at least two sealing bar means for axially urging said at least two sealing bar means against the lateral parts, a second spring means disposed between said sealing bar means and said wall portion on the gas side of said piston for radially urging said sealing bar means against the other wall portion of a respective peripheral groove.
  • a rotary piston internal combustion engine with a housing including a casing and lateral parts comprising: a piston disposed within said housing. a peripheral groove provided along each end face of said piston.
  • sealing bar means at least two axially movable sealing bar means disposed in each of said grooves, a first means for urging said sealing bar means against the lateral parts, a second means for urging said sealing bar means against a wall portion of a respective groove, wherein said sealing bar means have mutually different shapes.
  • a rotary piston internal combustion engine with a housing including a casing and lateral parts comprising: a piston disposed within said housing, a peripheral groove provided along each end face of said piston, at
  • sealing bar means at least two axially movable sealing bar means disposed in each of said grooves, a first means for urging said sealing bar means against the lateral parts, a second means for urging said sealing bar means against a wall portion of a respective groove, wherein said sealing bar means have mutually different sizes.
  • a rotary piston internal combustion engine with a housing including a casing and lateral parts comprising: a piston disposed within said housing, a peripheral groove provided along each end face of said piston, at least two axially movable sealing bar means disposed in each of said grooves, a first means for urging said sealing bar means against the lateral parts, a second means for urging said sealing bar means against a wall portion of a respective groove, wherein at least one of the sealing bar means of a respective groove consists of respectively different types of materials.
  • a rotary piston internal combustion engine according to claim 5, wherein said materials are selected from the group consisting of gray cast iron, bronze, aluminum, ceramics, carbon, steel, synthetic plastics and sintered metals.
  • a rotary piston internal combustion engine with a housing including a casing and lateral parts comprising: a piston disposed within said housing, a peripheral groove provided along each end face of said piston, at least two axially movable sealing bar means disposed in each of said grooves, a first means for urging said seal- 6 ing bar means against the lateral parts, a second means for urging said sealing bar means against a wall portion of a respective groove, wherein all of said sealing bar means ofa respective groove consist of respectively different types of materials.
  • a rotary piston internal combustion engine wherein said materials are selected from the group consisting of gray cast iron, bronze, aluminum, ceramics, carbon, steel, synthetic plastics and sintered metals.
  • a rotary piston internal combustion engine according to claim 1, wherein the engine is of trochoidal construction, said piston is of polygonal shape, and said housing casing is provided with a multi-arched running surface along which the piston corners of said polygonal piston slide.
  • a rotary piston internal combustion engine with a housing including a casing and lateral parts comprising: a piston disposed within the housing, bar groove means provided at the end faces of said piston, two axially movable sealing bar means guided in a respective bar groove means, axially effective sealing bar spring means inserted into said bar groove means for urging said sealing bar means against the lateral parts, one of said sealing bar means being constructed of substantially rectangular shape, the other of said sealing bar means being constructed of substantially L-shape as viewed in cross section, and radially effective sealing bar spring means, said L-shaped sealing bar means abutting against said radially effective sealing bar spring means and against said axially effective sealing spring means.
  • a rotary piston internal combustion engine according to claim 10, wherein only one axially effective sealing bar spring means is provided for the sealing bar means guided in a respective bar groove means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Sealing Devices (AREA)
US269734A 1971-07-09 1972-07-07 Rotary piston internal combustion engine, especially of trochoidal construction Expired - Lifetime US3861838A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2134227A DE2134227A1 (de) 1971-07-09 1971-07-09 Rotationskolben-brennkraftmaschine, insbesondere in trochoidenbauart

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US3861838A true US3861838A (en) 1975-01-21

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US269734A Expired - Lifetime US3861838A (en) 1971-07-09 1972-07-07 Rotary piston internal combustion engine, especially of trochoidal construction

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US (1) US3861838A (enExample)
DE (1) DE2134227A1 (enExample)
FR (1) FR2145965A5 (enExample)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4061445A (en) * 1976-05-10 1977-12-06 Frank Apostol Power-converting device
DE2917909A1 (de) * 1978-05-04 1979-11-15 Volschskoe Ob Proizv Legkovych Stirndichtung eines umlaufkolbenverbrennungsmotors
FR2499662A1 (fr) * 1981-02-09 1982-08-13 Trane Co Ensemble a element enroule et joint de bord pour appareil a fluide du type a volute
US20130028775A1 (en) * 2011-07-28 2013-01-31 Eugene Gekht Apex seal arrangement for rotary internal combustion engine
US8967988B2 (en) 2011-07-28 2015-03-03 Pratt & Whitney Canada Corp. Apex and face seals with rotary internal combustion engine
EP3546699A4 (en) * 2016-11-22 2020-05-27 Eagle Industry Co., Ltd. SEALING ELEMENT

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3994636A (en) * 1975-03-24 1976-11-30 Arthur D. Little, Inc. Axial compliance means with radial sealing for scroll-type apparatus
JPS551447A (en) * 1978-06-21 1980-01-08 Arai Pump Mfg Co Ltd Seal ring for multiple end surface

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3046049A (en) * 1960-12-20 1962-07-24 Lawrence E Paxton Automobile hat rack
US3300127A (en) * 1964-02-26 1967-01-24 Toyo Kogyo Company Ltd Rotary piston and seal therefor
US3309011A (en) * 1965-09-22 1967-03-14 Toyo Kogyo Company Ltd Seal construction for rotary combustion engine
US3314682A (en) * 1963-05-30 1967-04-18 Renault Lateral sealing rings for rotary engines
US3450108A (en) * 1967-06-06 1969-06-17 Joe G Rich Rotary internal combustion engine
US3535061A (en) * 1969-09-03 1970-10-20 Toyo Kogyo Co Rotor of rotary piston engine
US3575541A (en) * 1968-12-11 1971-04-20 Yanmar Diesel Engine Co Oil sealing unit in rotary piston engine
US3773442A (en) * 1972-04-17 1973-11-20 Gen Motors Corp Rotary machine rotor side seal groove construction

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3046049A (en) * 1960-12-20 1962-07-24 Lawrence E Paxton Automobile hat rack
US3314682A (en) * 1963-05-30 1967-04-18 Renault Lateral sealing rings for rotary engines
US3300127A (en) * 1964-02-26 1967-01-24 Toyo Kogyo Company Ltd Rotary piston and seal therefor
US3309011A (en) * 1965-09-22 1967-03-14 Toyo Kogyo Company Ltd Seal construction for rotary combustion engine
US3450108A (en) * 1967-06-06 1969-06-17 Joe G Rich Rotary internal combustion engine
US3575541A (en) * 1968-12-11 1971-04-20 Yanmar Diesel Engine Co Oil sealing unit in rotary piston engine
US3535061A (en) * 1969-09-03 1970-10-20 Toyo Kogyo Co Rotor of rotary piston engine
US3773442A (en) * 1972-04-17 1973-11-20 Gen Motors Corp Rotary machine rotor side seal groove construction

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4061445A (en) * 1976-05-10 1977-12-06 Frank Apostol Power-converting device
DE2917909A1 (de) * 1978-05-04 1979-11-15 Volschskoe Ob Proizv Legkovych Stirndichtung eines umlaufkolbenverbrennungsmotors
FR2499662A1 (fr) * 1981-02-09 1982-08-13 Trane Co Ensemble a element enroule et joint de bord pour appareil a fluide du type a volute
US4415317A (en) * 1981-02-09 1983-11-15 The Trane Company Wrap element and tip seal for use in fluid apparatus of the scroll type
US20130028775A1 (en) * 2011-07-28 2013-01-31 Eugene Gekht Apex seal arrangement for rotary internal combustion engine
US8967988B2 (en) 2011-07-28 2015-03-03 Pratt & Whitney Canada Corp. Apex and face seals with rotary internal combustion engine
US9850758B2 (en) 2011-07-28 2017-12-26 Pratt & Whitney Canada Corp. Apex and face seals with rotary internal combustion engine
US10344870B2 (en) * 2011-07-28 2019-07-09 Pratt & Whitney Canada Corp. Apex seal arrangement for rotary internal combustion engine
EP3546699A4 (en) * 2016-11-22 2020-05-27 Eagle Industry Co., Ltd. SEALING ELEMENT

Also Published As

Publication number Publication date
FR2145965A5 (enExample) 1973-02-23
DE2134227A1 (de) 1973-01-25

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