US3319612A - Water-cooled rotary piston engine - Google Patents

Water-cooled rotary piston engine Download PDF

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Publication number
US3319612A
US3319612A US490228A US49022865A US3319612A US 3319612 A US3319612 A US 3319612A US 490228 A US490228 A US 490228A US 49022865 A US49022865 A US 49022865A US 3319612 A US3319612 A US 3319612A
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US
United States
Prior art keywords
piston
engine
shell
housing
water
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
US490228A
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English (en)
Inventor
Hamada Yoshitsugu
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.)
Yanmar Co Ltd
Original Assignee
Yanmar Diesel Engine 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 Yanmar Diesel Engine Co Ltd filed Critical Yanmar Diesel Engine Co Ltd
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Publication of US3319612A publication Critical patent/US3319612A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B55/00—Internal-combustion aspects of rotary pistons; Outer members for co-operation with rotary pistons
    • F02B55/08—Outer members for co-operation with rotary pistons; Casings
    • F02B55/10—Cooling thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B53/00—Internal-combustion aspects of rotary-piston or oscillating-piston engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B55/00—Internal-combustion aspects of rotary pistons; Outer members for co-operation with rotary pistons
    • F02B55/02—Pistons
    • F02B55/04—Cooling thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B55/00—Internal-combustion aspects of rotary pistons; Outer members for co-operation with rotary pistons
    • F02B55/02—Pistons
    • F02B55/04—Cooling thereof
    • F02B55/06—Cooling thereof by air or other gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B53/00—Internal-combustion aspects of rotary-piston or oscillating-piston engines
    • F02B2053/005—Wankel engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2730/00—Internal-combustion engines with pistons rotating or oscillating with relation to the housing
    • F02B2730/01—Internal-combustion engines with pistons rotating or oscillating with relation to the housing with one or more pistons in the form of a disk or rotor rotating with relation to the housing; with annular working chamber
    • F02B2730/018—Internal-combustion engines with pistons rotating or oscillating with relation to the housing with one or more pistons in the form of a disk or rotor rotating with relation to the housing; with annular working chamber with piston rotating around an axis passing through the gravity centre, this piston or the housing rotating at the same time around an axis parallel to the first axis
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • WATER-COOLED ROTARY PISTON ENGINE Filed Sept. 27, 1965 INVENTOR S//fiuju fi am d ATTORNEY-5 United States Patent Ofifice 3,319,612 Patented May 16, 1967 3,319,612 WATER-COGLED ROTARY PISTON ENGINE Yoshitsugu Hamada, Nagahama-shi, Japan, assignor to Yanmar Diesel Engine Co., Ltd., Osaka, Japan, a corporation of Japan Filed Sept. 27, 1965, Ser. No. 490,228 Claims priority, application Japan, Sept. 30, 1964, 39/ 76,342 3 Claims. (Cl.
  • This invention relates to water-cooled rotary piston engines of the type including a housing comprised of a shell, the inner surface of which has a multi-lobed profile approximating an epitrochoid, and end walls secured to said shell at its opposite ends, an engine shaft extending axially through said housing and having an eccentric portion between said end walls thereof, and a piston mounted on said eccentric portion of said engine shaft and adapted so as to rotate in the same direction as said engine shaft at a predetermined revolution ratio thereto, said piston having an approximately polygonal transverse cross section defining apex portions slidable along the inner surface of said shell.
  • this type of rotary piston engine has generally included a cooling system in which cooling oil is circulated through the interior of the piston for the purpose of cooling the latter.
  • oil scraping rings are usually employed and are mounted on the piston so as to slide over the adjacent end walls of the engine housing maintaining pressure contact therewith.
  • the sliding contact of the oil scraping rings with the end walls of the engine housing causes substantial resistance to the rotation of the engine shaft and makes it more ditlicult to start the engine by human effort.
  • the conventional cooling system has necessarily included a feed pump for circulating oil through the piston, an oil reservoir for storing oil discharged from the piston, and an oil strainer, which is necessary where the lubricant oil, used for lubrication of the engine shaft hearings, is utilized as a cooling medium according to the general practice. Accordingly, in cases where this type of engine is used, for example, as an outboard motor, it compares unfavorably in weight and cost with a conventional two-cycle reciprocating engine because of the need for extraneous accessories, as mentioned hereinbefore.
  • the present invention proposes to attain the purpose of cooling the piston principally by heat transmission through gas seals secured to the piston so as to provide sliding engagement with the end walls of the engine housing and partly by dissipation of heat from the piston to the fuel-air mixture, which is circulated through the piston.
  • the shell and end walls of the engine housing include so-called hot areas which are continuously exposed to highly heated gases and never cooled by suction air.
  • the piston is alternately exposed to the highly heated gases and the cold suction air, thus having a low heat load compared to the housing.
  • the proposed system of cooling the piston inherently involves the following deficiencies.
  • the piston itself is held at a temperature somewhat higher than that obtainable when oil-cooled. and this causes a 'se in the temperature of the bearings supporting the piston and reduces the service life of the hearings.
  • circulation of the sucked gaseous mixture through the piston which has a planetary motion within the housing, reduces the charging efiiciency of the engine.
  • the first-mentioned deficiency can be eliminated by throttling the heat flow from the rotor to the outer race of the bearing while the second-mentioned deficiency can be eliminated by forming the passage of the gaseous mixture so as not to disturb its flow through the piston.
  • FIG. 1 is a vertical cross-sectional view of one embodiment of the present invention
  • FIG. 2 is a horizontal cross-sectional view of same taken substantially along the line A-A in FIG. 1;
  • FIG. 3 is an enlarged fragmentary cross-section taken substantially along the line B-B in FIG. 2;
  • FIG. 3a is a diagram illustrating the relative velocity of the gaseous mixture in FIG. 3.
  • FIG. 4 is a fragmentary enlargement of a portion of FIG. 1.
  • the rotary piston engine illustrated and which embodies the present invention, includes a housing comprised of a shell 1, the inner surface of which has a multi-lobed profile approximating an epitrochoid, and end walls 3 and 5 secured to said shell at its opposite ends.
  • An engine shaft 7 extends axially through the engine housing and has an eccentric portion 7a.
  • a piston 9 which carries an internal gear 15 thereon.
  • a pinion gear 13 Secured to one of the end walls 5 is a pinion gear 13 which is in meshing engagement with the internal gear 15 so as to allow rotation of the piston at a predetermined revolution ratio to the engine shaft and in the same direction as the latter.
  • Water is circulated for the cooling purpose through a Water jacket 17 formed in the housing shell 1 and water jackets I19 and 21 formed in the respective housing end walls 3 and 5.
  • Each of the arcuate surfaces of the piston defines a working chamber 23 together with the epitrochoidal inner surface of the housing shell 1 and, with rotation of the piston 9, the working chamber 23 increases in volume to reduce the pressure therein to a vacuum. Accordingly, by providing a suction passage 25 in one of the end walls 3 of the housing and respective passages 27 and 29 in the piston and the other end wall 5, it is possible to suck a gaseous mixture of air and fuel including lubricant oil from the exterior of the engine into the working chamber 23. 1
  • the vector Vm indicates the average velocity of the gaseous mixture
  • the vector U indicates the average peripheral speed of the piston 9
  • vector V indicates the velocity of the gaseous mixture in the piston relative there- [0.
  • a water-cooled rotary piston engine of the type including a housing comprised of a shell, the inner surface of which has a multi-lobed profile approximating an epitrochoid, and end walls secured to said shell at its opposite ends, an engine shaft extending axially through said housing and including an eccentric portion between said end walls thereof and a piston mounted on said eccentric portion of said engine shaft and adapted to rotate in the same direction as said engine shaft at a predetermined revolution ratio thereto, said piston having an approximately polygonal transverse cross section defining apex portions slid'able along the inner surface of said shell, means for water-cooling said shell and end walls of said housing and means for circulating a fuelair mixture through said piston.
  • a water-cooled rotary piston. engine as claimed in claim 1 in which said piston provides passages of the fuel-air mixture formed to coincide in direction with the relative direction of the flow of said mixture passing through the piston.
  • a water-cooled rotary piston engine as claimed in claim 1 in which an antifriction bearing for mounting said piston on the eccentric portion of said engine shaft is provided, the outer race of which being provided in its outer periphery with a peripheral groove of a substantial width.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
US490228A 1964-09-30 1965-09-27 Water-cooled rotary piston engine Expired - Lifetime US3319612A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7634264 1964-09-30

Publications (1)

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US3319612A true US3319612A (en) 1967-05-16

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US490228A Expired - Lifetime US3319612A (en) 1964-09-30 1965-09-27 Water-cooled rotary piston engine

Country Status (3)

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US (1) US3319612A (de)
DE (1) DE1451878A1 (de)
GB (1) GB1125125A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3424135A (en) * 1966-02-23 1969-01-28 Yanmar Diesel Engine Co Suction device for rotary piston internal combustion engine
US3644070A (en) * 1968-09-30 1972-02-22 Soc D Const Et D Exploit De Ma Cooling circuit for rotary piston internal combustion engines
US3652190A (en) * 1969-07-15 1972-03-28 Fichtel & Sachs Ag Rotor for a rotary internal combustion engine
US4047856A (en) * 1976-03-18 1977-09-13 Hoffman Ralph M Rotary steam engine
US4418656A (en) * 1980-03-03 1983-12-06 Stanton Austin N Rotary motion transformer
US6146120A (en) * 1998-07-29 2000-11-14 Jenn Feng Industrial Co., Ltd. Rotary engine having an improved rotor structure

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2947290A (en) * 1957-11-18 1960-08-02 Nsu Werke Ag Heat generating rotary internal combustion engine
US3012550A (en) * 1958-10-07 1961-12-12 Nsu Motorenwerke Ag Rotary mechanism bearing arrangement
CA650233A (en) * 1962-10-09 Bentele Max Seal vent arrangement for rotary mechanisms
US3102682A (en) * 1961-02-10 1963-09-03 Nsu Motorenwerke Ag Neckarsulm Liquid cooling for the rotor of a rotating-piston engine
DE1155633B (de) * 1961-11-18 1963-10-10 Daimler Benz Ag Rotationskolben-Brennkraftmaschine
GB940826A (en) * 1961-02-25 1963-11-06 Daimler Benz Ag Improvements relating to the lubrication of rotary piston internal combustion engines
US3112870A (en) * 1961-06-06 1963-12-03 Curtiss Wright Corp Air cooled rotor for rotary mechanism

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA650233A (en) * 1962-10-09 Bentele Max Seal vent arrangement for rotary mechanisms
US2947290A (en) * 1957-11-18 1960-08-02 Nsu Werke Ag Heat generating rotary internal combustion engine
US3012550A (en) * 1958-10-07 1961-12-12 Nsu Motorenwerke Ag Rotary mechanism bearing arrangement
US3102682A (en) * 1961-02-10 1963-09-03 Nsu Motorenwerke Ag Neckarsulm Liquid cooling for the rotor of a rotating-piston engine
GB940826A (en) * 1961-02-25 1963-11-06 Daimler Benz Ag Improvements relating to the lubrication of rotary piston internal combustion engines
US3112870A (en) * 1961-06-06 1963-12-03 Curtiss Wright Corp Air cooled rotor for rotary mechanism
DE1155633B (de) * 1961-11-18 1963-10-10 Daimler Benz Ag Rotationskolben-Brennkraftmaschine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3424135A (en) * 1966-02-23 1969-01-28 Yanmar Diesel Engine Co Suction device for rotary piston internal combustion engine
US3644070A (en) * 1968-09-30 1972-02-22 Soc D Const Et D Exploit De Ma Cooling circuit for rotary piston internal combustion engines
US3652190A (en) * 1969-07-15 1972-03-28 Fichtel & Sachs Ag Rotor for a rotary internal combustion engine
US4047856A (en) * 1976-03-18 1977-09-13 Hoffman Ralph M Rotary steam engine
US4418656A (en) * 1980-03-03 1983-12-06 Stanton Austin N Rotary motion transformer
US6146120A (en) * 1998-07-29 2000-11-14 Jenn Feng Industrial Co., Ltd. Rotary engine having an improved rotor structure

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Publication number Publication date
DE1451878A1 (de) 1969-05-29
GB1125125A (en) 1968-08-28

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