US3876345A - Rotary piston combustion engine with oil-cooled piston - Google Patents

Rotary piston combustion engine with oil-cooled piston Download PDF

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Publication number
US3876345A
US3876345A US251703A US25170372A US3876345A US 3876345 A US3876345 A US 3876345A US 251703 A US251703 A US 251703A US 25170372 A US25170372 A US 25170372A US 3876345 A US3876345 A US 3876345A
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United States
Prior art keywords
piston
oil
coolant
pump
passages
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Expired - Lifetime
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US251703A
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English (en)
Inventor
Walter Froede
Wulf Leitermann
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Audi AG
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Audi AG
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Filing date
Publication date
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Publication of US3876345A publication Critical patent/US3876345A/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
    • F02B55/02—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
    • F02B53/00—Internal-combustion aspects of rotary-piston or oscillating-piston engines
    • F02B2053/005—Wankel engines

Definitions

  • the invention concerns a rotary piston combustion engine with an oil-cooled piston which is pivoted on the eccentric of an eccentric shaft mounted in the housing of the combustion engine.
  • the oil used both for lubricating the shaft and piston bearings and for cooling the piston is supplied through a hole in the eccentric shaft from where channels lead to the individual bearings.
  • the cooling of the piston takes place thereby by means of leak oil coming from the piston bearing and forced into the hollow spaces of the piston and/or by means of spray nozzles which are supplied from the hole in the eccentric shaft and spray the cooling oil directly into the hollow spaces of the piston.
  • the cooling and the leak oil is collected in receivers and then fed into a tank from where it is drawn off by means ofa feed pump.
  • this oil is again fed into the hole in the eccentric shaft.
  • the object of this invention is to eliminate this disadvantage.
  • the invention proposes that separate oil circulating systems be provided for the cooling oil flowing through the piston and for the oil serving to lubricate the shaft and piston bearings.
  • the amount of oil and the oil pressure in each oil circulating system may be optimized in accordance with the given requirements.
  • the present invention makes it possible to adjust the amount of cooling oil flowing through the piston according to the given load of the engine. It has been found that fuel consumption is relatively high at low loads and low speeds. This can be explained by the fact that the working chambers of rotary piston combustion engines as compared to reciprocating engines have a relatively large heat-emitting surface and thus do not reach their operating temperature within the abovementioned working range.
  • the optimal piston temperature at any operating condition can be achieved by providing in the pipe to the piston a valve which is controlled depending on the temperature of the cooling oil in the return pipe and which shuts 'off the feed pipe should the temperature fall below a certain value. Accordingly, the cooling of the piston will be reduced and a higher piston temperature obtained.
  • the carburated gas is prepared for combustion on reaching the piston when the latter is hot.
  • the described valve in the cooling oil supply pipe could be also controlled by speed or load.
  • the temperature of the cooling oil as it flows out of the piston is a more simple and a more reliable indication ofthe piston temperature.
  • the rotary piston combustion engine has a housing which consists of a casing l with a double-bent inner surface 2 and side parts 3 and 4 which are parallel to each other.
  • An eccentric shaft 7 is pivoted on friction bearings 5 and 6 in the side parts 3 and 4.
  • a triangular piston 10 is pivoted by way of a piston bearing 9 on the eccentric 8 of the eccentric shaft 7.
  • the speed of the piston 10 is at a fixed ratio to the speed of the eccentric shaft 7 by way of a transmission consisting of a hollow wheel 11 attached to the piston 10 and a pinion l2 fastened to the side part 3.
  • the piston 10 is provided with hollow spaces 13 through which the coolant flows.
  • a sealing ring 15 is provided on the right side of the eccentric 8; this ring works together with the adjacent front wall of the piston 10.
  • a disc 16 is screwed to the left side of the eccentric 8. This disc 16 carries a sealing ring 17 which works together with the adjacent piston wall as well as a sealing ring 18 which works together with the housing side part 3.
  • the lubrication system has a pump 19 which draws off the lubricating oil from the tank 20 and supplies it by way of channels 21 and 22 in the side parts 3 and 4 to the shaft bearings 5 and 6.
  • the shaft bearing 5 has holes 23 which are connected to one side to the channel 21 and on the other to a cross hole 24 in the eccentric shaft 7..
  • the cross hole 24 runs into a longitudinal hole 25 in the eccentric shaft 7 from where another cross hole 26 leads to the piston bearing 9. In this way, the piston bearing 9 is supplied with lubricant.
  • the cooling oil circulating system for the piston 10 has its own pump 27 which likewise draws off oil from the tank 20 and feeds cooling oil by way of a pipe 28 to a cross hole 29 in the eccentric shaft 7.
  • the cross hole 29 runs into the longitudinal hole 25.
  • a pipe 30 is inserted into the said hole 25.
  • This pipe 30 ends before the end of the longitudinal hole 25 and is sealed at 31 and 32 against the wall ofthe hole 25.
  • This space 33 between the end of the pipe 30 and the end of the hole 25 is connected to the hollow spaces 13 of the piston by way of a cross hole 34.
  • the cooling oil is fed by the pump 27 into the hollow spaces 13 of the piston by way of the pipe 28, the cross hole 29, the pipe 30, the space 33 and the cross hole 34.
  • a valve 38 is provided in the feed channel 28 for the cooling oil.
  • the control piston 39 of the valve is springloaded by means of the spring 40 which tends to hold the piston 39 in a position which partially shuts off the feed pipe 28, as shown in the drawing.
  • the valve 38 is controlled by a temperature responsive device 41 which responds to the temperature of the cooling oil as it flows through the return pipe 37.
  • control piston 39 When the engine is cold, the control piston 39 will be in the position as shown in which only a partially throttled supply of cooling oil will reach the hollow spaces 13 of the piston.
  • the valve piston 39 When the engine reaches its operating temperature which will be indicated by a corresponding temperature of the cooling oil flowing through the return pipe 37, the valve piston 39 will be shifted to the left in the drawing by the temperature responsive device 41 with the result that the annular tee-slot 42 in the valve piston 39 will be in the plane of the feed pipe 28 so that a larger cooling oil amount will be supplied to the piston 10.
  • valve 38 responding to the temperature of the cooling oil in the return pipe 37
  • another valve responding to speed and/or load could be provided which would throttle the feed pipe 28 at low loads and low speeds.
  • the pump 19 for bearing lubrication can be designed for a small delivery volume at high pressure and the pump 27 for the cooling oil for a large delivery volume at low pressure.
  • the ratio of delivery volumes of the pumps 19 and 27 is approximately 1:4, whereby the lubricating oil pump 19 delivers with a pressure of approximately 5 atmospheres gage pressure and the cooling oil pump with a pressure of approximately 3 atmospheres gage pressure. Both pumps together consume less power than the hitherto commonly used single pump for both lubricating and cooling oil which had to be designed for a large delivery volume at high pressure.
  • a rotary piston combustion engine comprising:
  • a housing a shaft mounted in the housing, shaft bearings interposed between the shaft and the housing, an eccentric on the shaft, a rotary piston carried by the eccentric, a piston bearing interposed between the eccentric and the piston, the piston including hollow spaces through which a coolant flows to cool the piston, a first oil circulating system for lubricating the shaft and piston bearings, the first system including first passages for conducting lubricating oil to the bearings, a first pump for pumping lubricating oil from a source through the first passages to the bearings, said first pump having a capacity to deliver oil in small volume and at a high pressure, a second independent oil circulating system for directing an oil coolant to the piston, the second system including second passages for conducting the coolant to the piston hollow spaces to cool the piston, a second pump for pumping the coolant from a source through the second passages to the piston hollow spaces, said second pump having a capacity to deliver the coolant in large volume and at low pressure, a return passage for receiving and directing the coolant from the piston

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  • 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)
  • Reciprocating Pumps (AREA)
US251703A 1971-05-10 1972-05-09 Rotary piston combustion engine with oil-cooled piston Expired - Lifetime US3876345A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712123011 DE2123011A1 (de) 1971-05-10 1971-05-10 Kreiskolben Brennkraftmaschine mit ölgekühltem Kolben

Publications (1)

Publication Number Publication Date
US3876345A true US3876345A (en) 1975-04-08

Family

ID=5807387

Family Applications (1)

Application Number Title Priority Date Filing Date
US251703A Expired - Lifetime US3876345A (en) 1971-05-10 1972-05-09 Rotary piston combustion engine with oil-cooled piston

Country Status (6)

Country Link
US (1) US3876345A (OSRAM)
JP (1) JPS5522610B1 (OSRAM)
DE (1) DE2123011A1 (OSRAM)
FR (1) FR2139336A5 (OSRAM)
GB (1) GB1358002A (OSRAM)
IT (1) IT953819B (OSRAM)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4011032A (en) * 1975-03-21 1977-03-08 Audi Nsu Auto Union Aktiengesellschaft System for liquid cooling of a rotor or a rotary mechanism
US4173440A (en) * 1977-06-17 1979-11-06 Compagnie Industrielle Des Telecommunications Cit-Alcatel Method and device for lubricating compressors
US4174197A (en) * 1976-07-14 1979-11-13 Audi Nsu Auto Union Aktiengesellschaft Rotary-piston machine having a liquid-cooled piston
US4218200A (en) * 1977-06-30 1980-08-19 Toyo Kogyo Co., Ltd. Rotor cooling means for rotary piston engines
US4648815A (en) * 1984-09-05 1987-03-10 The Hydrovane Compressor Company Limited Rotary air compressor with thermally responsive oil injection
US5028220A (en) * 1990-08-13 1991-07-02 Sullair Corpoation Cooling and lubrication system for a vacuum pump
US20050186103A1 (en) * 2004-02-20 2005-08-25 Wankel Super Tec Gmbh Rotary combustion engine with device for conveying lubricating oil
US20090129956A1 (en) * 2007-11-21 2009-05-21 Jean-Louis Picouet Compressor System and Method of Lubricating the Compressor System
WO2010114394A1 (en) * 2009-03-30 2010-10-07 Pivotal Engineering Limited Engine cooling system
WO2013023839A3 (de) * 2011-08-12 2013-11-07 Wankel Supertec Gmbh Kreiskolbenmaschine mit öldichtungssystem
US20140140878A1 (en) * 2012-11-21 2014-05-22 Gilo Industries Research Ltd. Cooling systems for rotary engines
US20230012413A1 (en) * 2021-07-06 2023-01-12 Pratt & Whitney Canada Corp. Lubrication system for a turbine engine
US11719139B2 (en) * 2016-10-31 2023-08-08 Cummins Inc. Reduced parasitic lube system

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57130228U (OSRAM) * 1981-02-05 1982-08-13
DE3545818A1 (de) * 1985-12-23 1987-07-02 Wankel Gmbh Kuehlsystem einer rotationskolbenbrennkraftmaschine
JPS62153502A (ja) * 1985-12-23 1987-07-08 ウアンケル・ゲゼルシヤフト・ミト・ベシユレンクテル・ハフツング 回転ピストンエンジンの偏心軸
US6213250B1 (en) 1998-09-25 2001-04-10 Dresser Industries, Inc. Transducer for acoustic logging

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2936949A (en) * 1953-05-28 1960-05-17 Broom & Wade Ltd Air compressor
US3042009A (en) * 1958-10-02 1962-07-03 Nsu Motorenwerke Ag Cooling arrangement for rotary mechanisms
US3131679A (en) * 1961-01-18 1964-05-05 Renault Rotors of rotary engines
US3261542A (en) * 1963-05-08 1966-07-19 Curtiss Wright Corp Rotor and seal construction for rotary mechanisms
US3280812A (en) * 1966-10-25 Lubrication of the gastight radial scrapers in rotary engines
US3359952A (en) * 1966-01-06 1967-12-26 Curtiss Wright Corp Pressure balanced sealing construction
US3712766A (en) * 1971-11-08 1973-01-23 Curtiss Wright Corp Rotary internal combustion engine with low starting drag

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3280812A (en) * 1966-10-25 Lubrication of the gastight radial scrapers in rotary engines
US2936949A (en) * 1953-05-28 1960-05-17 Broom & Wade Ltd Air compressor
US3042009A (en) * 1958-10-02 1962-07-03 Nsu Motorenwerke Ag Cooling arrangement for rotary mechanisms
US3131679A (en) * 1961-01-18 1964-05-05 Renault Rotors of rotary engines
US3261542A (en) * 1963-05-08 1966-07-19 Curtiss Wright Corp Rotor and seal construction for rotary mechanisms
US3359952A (en) * 1966-01-06 1967-12-26 Curtiss Wright Corp Pressure balanced sealing construction
US3712766A (en) * 1971-11-08 1973-01-23 Curtiss Wright Corp Rotary internal combustion engine with low starting drag

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4011032A (en) * 1975-03-21 1977-03-08 Audi Nsu Auto Union Aktiengesellschaft System for liquid cooling of a rotor or a rotary mechanism
US4174197A (en) * 1976-07-14 1979-11-13 Audi Nsu Auto Union Aktiengesellschaft Rotary-piston machine having a liquid-cooled piston
US4173440A (en) * 1977-06-17 1979-11-06 Compagnie Industrielle Des Telecommunications Cit-Alcatel Method and device for lubricating compressors
US4218200A (en) * 1977-06-30 1980-08-19 Toyo Kogyo Co., Ltd. Rotor cooling means for rotary piston engines
US4648815A (en) * 1984-09-05 1987-03-10 The Hydrovane Compressor Company Limited Rotary air compressor with thermally responsive oil injection
US5028220A (en) * 1990-08-13 1991-07-02 Sullair Corpoation Cooling and lubrication system for a vacuum pump
US20050186103A1 (en) * 2004-02-20 2005-08-25 Wankel Super Tec Gmbh Rotary combustion engine with device for conveying lubricating oil
US7234924B2 (en) * 2004-02-20 2007-06-26 Wankel Super Tec Gmbh Rotary combustion engine with device for conveying lubricating oil
US20090129956A1 (en) * 2007-11-21 2009-05-21 Jean-Louis Picouet Compressor System and Method of Lubricating the Compressor System
WO2010114394A1 (en) * 2009-03-30 2010-10-07 Pivotal Engineering Limited Engine cooling system
WO2013023839A3 (de) * 2011-08-12 2013-11-07 Wankel Supertec Gmbh Kreiskolbenmaschine mit öldichtungssystem
US20140140878A1 (en) * 2012-11-21 2014-05-22 Gilo Industries Research Ltd. Cooling systems for rotary engines
US11719139B2 (en) * 2016-10-31 2023-08-08 Cummins Inc. Reduced parasitic lube system
US20230332521A1 (en) * 2016-10-31 2023-10-19 Cummins Inc. Reduced parasitic lube system
US12163449B2 (en) * 2016-10-31 2024-12-10 Cummins Inc. Reduced parasitic lube system
US20230012413A1 (en) * 2021-07-06 2023-01-12 Pratt & Whitney Canada Corp. Lubrication system for a turbine engine
US11732646B2 (en) * 2021-07-06 2023-08-22 Pratt & Whitney Canada Corp. Lubrication system for a turbine engine

Also Published As

Publication number Publication date
IT953819B (it) 1973-08-10
DE2123011A1 (de) 1972-12-14
JPS5522610B1 (OSRAM) 1980-06-18
FR2139336A5 (OSRAM) 1973-01-05
GB1358002A (en) 1974-06-26

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