US3924314A - Assembly method for rotary engine - Google Patents

Assembly method for rotary engine Download PDF

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Publication number
US3924314A
US3924314A US413546A US41354673A US3924314A US 3924314 A US3924314 A US 3924314A US 413546 A US413546 A US 413546A US 41354673 A US41354673 A US 41354673A US 3924314 A US3924314 A US 3924314A
Authority
US
United States
Prior art keywords
rotor
seal
engine
spring
seals
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
US413546A
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English (en)
Inventor
Harold W Ferchland
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.)
Motors Liquidation Co
Original Assignee
General Motors Corp
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 General Motors Corp filed Critical General Motors Corp
Priority to US413546A priority Critical patent/US3924314A/en
Priority to JP49127621A priority patent/JPS515126B2/ja
Publication of USB413546I5 publication Critical patent/USB413546I5/en
Application granted granted Critical
Publication of US3924314A publication Critical patent/US3924314A/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
    • F01C19/02—Radially-movable sealings for working fluids
    • F01C19/04—Radially-movable sealings for working fluids of rigid material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49231—I.C. [internal combustion] engine making
    • Y10T29/49234—Rotary or radial engine making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49297—Seal or packing making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4981—Utilizing transitory attached element or associated separate material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49904—Assembling a subassembly, then assembling with a second subassembly

Definitions

  • ABSTRACT Primary ExaminerRichard J. Herbst Assistant ExaminerDan C. Crane Attorney, Agent, or FirmGeorge A. Grove [57] ABSTRACT
  • This film composition adheres to the side of the groove and temporarily holds the spring-biased seals in a recessed position during an assembly operation.
  • the properties of the composition are such that the seals self-return after a short time to their normal operating positions for engine starting. Upon brief engine operation the wax composition evaporates and is consumed without residue.
  • This invention relates to the assembly of components of a rotary internal combustion engine, particularly of the Wankel type engine. More particularly, it relates to a method of retaining the many spring-biased seals, some in a recessed position, in the rotor grooves when the rotor is being positioned in the housing of the rotary engine.
  • Rotary engines of the Wankel type are now well known.
  • a generally triangular-shaped rotor or piston rotates inside an epitrochoid-shaped housing.
  • Seals carried by the rotor engage surfaces of the housing so that a number (frequently three) of separate spaces or cavities of varying volume are established.
  • the various seals carried by the rotor are usually spring-biased so that they are always urged into sealing engagement with the adjacent housing surface despite a change in relative position or attitude of the rotor with respect to portions of the housing.
  • the waxy composition then holds the seals positioned within the grooves and in a recessed position, if desired, against the force of its associated spring during engine assembly.
  • the holding power of the waxy material is overcome and the seal is urged to its normal operating position by the spring so that the engine can be started.
  • the waxy composition is consumed leaving no residue.
  • the film on the sides of the seals rubs against the adjacent walls of the grooves, adhereing thereto and holding the respective seals in place.
  • the apex seals will be pushed down into a recessed position in their grooves against the spring force of their associated springs.
  • the rotor is then placed in the housing of the mechanism and the engine is fully assembled. Over a period of minutes a seal urged by its spring will assume its normal operating position, and thereafter when desired the engine may be started.
  • the wax composition employed in the assembly of the seals will first act as a lubricant for the sliding seals but will ultimately evaporate and be consumed and removed with exhaust products of the engine. No residue is left in the engine to corrode its parts or impede its operation. There is no need to remove any mechanical device which might otherwise have been employed in connection with the assembly of the seals and the rotor in the engine housing.
  • FIG. 1 is a sectional view of a partially assembled rotary engine
  • FIG. 2 is a perspective view of a rotor and its associated seals
  • FIG. 3 is a schematic drawing depicting one means of applying the.adherent lubricant composition to the side surfaces of an apex seal.
  • the waxy, adherent, lubricant composition employed in accordance with my rotary engine assembly process preferably incorporates a microcrystalline petroleum wax. Petroleum wax contributes adherency and body to the composition used during the assembly of the springbiased seals. After the engine has been started the waxy composition briefly serves as a lubricant until it is vaporized and burned from the engine without residue.
  • Other suitable vaporizable and combustible hydrocarbon-like materials may be mixed with the wax to modify its properties in this application.
  • liquid polybutenes having a number average molecular weight of about 2,500 to 3,000 can be mixed with a microcrystalline petroleum wax to increase its tack and desirable release properties.
  • percent by weight of a microcrystalline petroleum wax having a specific gravity of about 0.85 and a melting range of about to F. and about 30 percent by weight of a liquid polybutene is particularly useful in the practice of my process.
  • the mixture is prepared by melting a measured quantity of the wax and stirring in the polybutene and then cooling.
  • waxy compositions are suitable for use in the practice of my process.
  • a mixture consisting, by weight, of 40 percent liquid polybutene, 30 percent amorphous polypropylene of relatively high molecular weight, 20 percent microcrystalline petroleum wax and 10 percent hydrogenated wood rosin has been used.
  • This composition is likewise prepared by heating and mixing the components together.
  • tacky lubricant formulations are to be deemed only as illustrative of the waxy compositions which may be employed in the practice of my process.
  • a thin film of such a material of the order of two to three mils thickness is applied by any suitable method to surfaces of apex seals, side seals and/or corner seals of the rotary mechanism which will lie adjacent to the walls of a groove in the rotor when the seal is inserted therein.
  • the grooves are normally machined to provide a small clearance for the seal, and the lubricant film is smeared upon and adheres to the side wall of the groove when the seal and its spring is inserted therein.
  • the tacky lubricant temporarily holds the seal in place even in a recessed position against the force (upwards of 7 /2 lbs or so) of its spring tending to urge the seal out of the groove.
  • a first end housing is placed on a bench or in a suitable fixture.
  • the rotor housing 12 is placed on top of the end housing 10.
  • the crankshaft 14 is inserted into the end housing 10.
  • a rotor 16, with its apex seals 18 and apex seal springs 20, side seals 22 and side seal springs 24, and corner seals 26 all previously assembled in the proper grooves, and the eccentric 28 are threaded over the crankshaft 14 and positioned in the proper location or orientation for proper engine timing.
  • the side seals and comer seals may simply be held in place by the lubricant composition so that they do not fall out as the rotor is handled, shipped and placed in the rotor housing.
  • the lubricant film 30 applied to the surfaces of the side seal 22 and the corner seal, as indicated in FIG. 2, is very effective in holding the seals in place.
  • my lubricant composition is suitably applied to both side surfaces of an apex seal as indicated at 32. Each seal and its spring are then pushed into the groove in a recessed position as indicated at 34 of FIG. 2.
  • the lubricant film holds the apex seal in a recessed position until the rotor can be placed in the rotor housing.
  • the intermediate housing is then placed over the first rotor and the second rotor housing is placed over the intermediate housing.
  • the procedure described above with respect to the first rotor and its associated seals is repeated with respect to the second rotor.
  • the last end housing is then placed over the second rotor and the engine is bolted together, and the assembly completed by attaching the spark plugs, distributor, carburetor and the like.
  • the composition employed in accordance with this assembly process may be applied to appropriate surfaces of rotor seals in accordance with any of a number of suitable techniques.
  • the composition can initially be cast from a hot melt in the form of a crayon and rubbed onto one or more sides of a seal to form a film coating thereon.
  • a film of the composition can be applied by a hot melt gun which heats and extrudes the composition onto the side of a seal.
  • a method which has been found to be particularly suitable is to initially apply a thin layer of the composition, about 2 to 3 mils in thickness, to a strip of release paper.
  • the release paper is about 7/16 inch wide and of indefinite length.
  • a layer 38 of lubricant composition 3/16 inch in width can be applied to the paper 40 and then readily transferred by pressure, such as by a roll 42 as depicted in FIG. 3, at ambient temperature to an apex seal 18 or other seal.
  • the strip of layer lubricant formulation 38 releases from the sized release paper 40 and is transferred by pressure to form a film 32 on the apex seal 18.
  • apex seals on both sides so that they can be suitably held in a recessed position.
  • Side seals may suitably be coated on only one side since it may not be necessary to hold them in a recessed position but only to maintain them in the rotor groove.
  • the comer seals are keyed with the apex seals and the adherent lubricant on the apex seal is frequently sufficient to hold the comer seal.
  • the described adherent, lubricant compositon may be employed in accordance with the subject assembly method although the composition of the seals and rotor may vary from application to application.
  • the rotor is formed of a ferrous base material such as steel or cast iron and may also be formed of aluminum in accordance with my assembly method.
  • the seals may be formed of any suitable metal, carbon-metal composite or other suitable material and still be compatible with the practice of my assembly method.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gasket Seals (AREA)
  • Sealing Devices (AREA)
US413546A 1973-11-07 1973-11-07 Assembly method for rotary engine Expired - Lifetime US3924314A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US413546A US3924314A (en) 1973-11-07 1973-11-07 Assembly method for rotary engine
JP49127621A JPS515126B2 (enExample) 1973-11-07 1974-11-07

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US413546A US3924314A (en) 1973-11-07 1973-11-07 Assembly method for rotary engine

Publications (2)

Publication Number Publication Date
USB413546I5 USB413546I5 (enExample) 1975-01-28
US3924314A true US3924314A (en) 1975-12-09

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JP (1) JPS515126B2 (enExample)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4021204A (en) * 1975-06-09 1977-05-03 Breda Termomeccanica S.P.A. Method of manufacturing a grill-type support comprising two different materials and capable of being initially rigid, while allowing differential thermal expansions after installation
US6164422A (en) * 1996-11-15 2000-12-26 Lucas Industries Public Limited Company Method for assembling a disk brake with a lacquer-coated sealing ring and a disk brake assembly
US20160017739A1 (en) * 2014-07-21 2016-01-21 United Technologies Corporation Seal assembly for a guide vane assembly
US12013035B2 (en) 2019-02-25 2024-06-18 Federal-Mogul Motorparts Llc Cylinder head gasket assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3353830A (en) * 1964-03-23 1967-11-21 Roscoe L Bell End securing means for a spacer expander of a piston ring assembly
US3356375A (en) * 1964-12-04 1967-12-05 Paul E Harris Unitized oil rings
US3492710A (en) * 1966-03-25 1970-02-03 Nadella Mounting of a bearing in a bore
US3745630A (en) * 1970-12-16 1973-07-17 Daimler Benz Ag Method of preassembly and assembly of a multipartite seal

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3353830A (en) * 1964-03-23 1967-11-21 Roscoe L Bell End securing means for a spacer expander of a piston ring assembly
US3356375A (en) * 1964-12-04 1967-12-05 Paul E Harris Unitized oil rings
US3492710A (en) * 1966-03-25 1970-02-03 Nadella Mounting of a bearing in a bore
US3745630A (en) * 1970-12-16 1973-07-17 Daimler Benz Ag Method of preassembly and assembly of a multipartite seal

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4021204A (en) * 1975-06-09 1977-05-03 Breda Termomeccanica S.P.A. Method of manufacturing a grill-type support comprising two different materials and capable of being initially rigid, while allowing differential thermal expansions after installation
US6164422A (en) * 1996-11-15 2000-12-26 Lucas Industries Public Limited Company Method for assembling a disk brake with a lacquer-coated sealing ring and a disk brake assembly
US6439351B1 (en) * 1996-11-15 2002-08-27 Lucas Industries Public Limited Company Brake for a hydraulic vehicle brake system, sealing ring for such a brake and method for producing such a sealing ring
US20160017739A1 (en) * 2014-07-21 2016-01-21 United Technologies Corporation Seal assembly for a guide vane assembly
US9617864B2 (en) * 2014-07-21 2017-04-11 United Technologies Corporation Seal assembly for a guide vane assembly
US12013035B2 (en) 2019-02-25 2024-06-18 Federal-Mogul Motorparts Llc Cylinder head gasket assembly

Also Published As

Publication number Publication date
USB413546I5 (enExample) 1975-01-28
JPS515126B2 (enExample) 1976-02-17
JPS50111418A (enExample) 1975-09-02

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