WO2008028216A1 - Moteur à piston libre amélioré - Google Patents

Moteur à piston libre amélioré Download PDF

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Publication number
WO2008028216A1
WO2008028216A1 PCT/AU2007/001193 AU2007001193W WO2008028216A1 WO 2008028216 A1 WO2008028216 A1 WO 2008028216A1 AU 2007001193 W AU2007001193 W AU 2007001193W WO 2008028216 A1 WO2008028216 A1 WO 2008028216A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
cylinder
internal combustion
combustion engine
strokes
Prior art date
Application number
PCT/AU2007/001193
Other languages
English (en)
Inventor
Edward Wechner
Original Assignee
Edward Wechner
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
Priority claimed from AU2006904838A external-priority patent/AU2006904838A0/en
Application filed by Edward Wechner filed Critical Edward Wechner
Publication of WO2008028216A1 publication Critical patent/WO2008028216A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L11/00—Valve arrangements in working piston or piston-rod
    • F01L11/02—Valve arrangements in working piston or piston-rod in piston
    • 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
    • F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
    • 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
    • F02B71/00—Free-piston engines; Engines without rotary main shaft
    • F02B71/04—Adaptations of such engines for special use; Combinations of such engines with apparatus driven thereby
    • 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
    • F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
    • F02B63/041—Linear electric generators

Definitions

  • This invention relates to internal combustion engines. More particularly although not exclusively it discloses an improved form of free-piston engine.
  • the deformation results from the elasticity of the unsupported ring material when subjected to radial forces imposed by gas pressure and the pre-tension in the rings. This deformation accelerates the wear rate of the rings and cylinder sleeve and is partly responsible for abandonment of the two stroke engine in modern passenger cars.
  • an internal combustion engine having a housing with at least one cylinder with electricity generating stator means fixed relative thereto, a piston arranged in said cylinder for cycles of reciprocating compression and power strokes between positions at top dead centre and bottom dead centre, inlet valve means for introducing an air or fuel mixture into said cylinder prior to said compression strokes, outlet valve means for the expulsion of exhaust gases following said power strokes and said piston being linked to a linear actuator for -3- movement therewith so that during operation of said engine the reciprocating strokes of said piston and linear actuator with respect to the stator means generates usable electrical energy and wherein said engine further includes spring means acting on the piston to bias said piston towards top dead centre on said compression strokes.
  • said inlet valve means is located in said piston and comprises a portion of the head thereof.
  • the spring biasing means comprises a coil spring acting between underside flanges of said piston and a base of said housing.
  • the spring coil cross-section varies, whereby said spring is adapted to exert a force on said piston which increases exponentially during displacement toward bottom dead centre.
  • said coil cross-section increases along the length of the spring extending away from said piston.
  • the coils of said spring are flattened to provide a contact area between adjacent coils.
  • Fig ⁇ re 1 shows a cross-sectional schematic view of a single cylinder free- piston engine along the centre axis of the cylinder with the piston at bottom dead centre
  • Figure 2 shows a cross-sectional schematic view of a free-piston engine along the centre axis of the cylinder with the piston at top dead centre.
  • the main components of the engine are the cylinder block or housing 1, cylinder IA, cylinder head 2, piston 3, linear actuator 4, electricity generating stator 5, biasing spring 6 and reed valve 7.
  • the cylinder preferably fires in the two stroke cycle and the resulting reciprocating linear motion is converted into electrical energy by means of relative movement between the linear actuator and stator assemblies.
  • inlet valves comprise poppet valves 8 which are located in the head of the piston 3.
  • FIG. 1 the piston 3 is shown at the end of the expansion or power stroke in cylinder IA. Both the inlet valves 8 and exhaust valves 9 are thus open to enable the two stroke gas exchange or scavenging process to take place.
  • the intake gas 10 for this scavenging process was compressed in the linear actuator compression chamber
  • the pressure obtained for the intake gas 10 is sufficient to open the inlet valves S in the piston 3 against both the force of valve springs 12 and the opposing kinetic force from deceleration of the valve mass 8 at the
  • a kinetic valve actuator mechanism may be fitted as described in the applicant's pending Australian patent application 2007901265 filed 9 March, 2007.
  • a kinetic valve actuator mechanism may be fitted as described in the applicant's pending Australian patent application 2007901265 filed 9 March, 2007.
  • the piston 3 is shown by figure 2 in the ignition position at top dead centre after having completed a previous compression stroke.
  • This compression stroke was effected with the potential energy stored in the biasing spring 6 at a bottom dead centre position as shown in figure 1.
  • fresh intake gas 17 was drawn by the linear actuator 4 in through the inlet 16 and the reed valve 7 into the compression chamber 1 1.
  • this gas 17 will be compressed in chamber 1 1 to comprise the subsequent intake gas charge 10 for the combustion chamber 15 of cylinder IA.
  • Potential energy will also again be stored in the biasing spring 6 for the succeeding compression stroke.
  • the linear actuator 4 is equipped with gas seal 18 to facilitate its function as a compressor piston for the gas exchange process. This eliminates the need for a external intake gas charging device. Between the electricity generating stator 5 and the linear actuator 4 there is also a cylindrical sleeve 19 which provides a dynamic mating surface for the gas seals 18. This sleeve 19 should be electrically non- conductive, non-magnetic and sufficiently thin to avoid adverse effects on the generating process. Suitable material may include ceramics or high temperature composite plastics which may be either deposited on the surface or pressed into the stator 5.
  • the biasing spring 6 is composed of steel coils 15C which increase in cross- section as shown along the length of said spring from the piston to the cylinder base. This produces an exponentially increasing force on the piston as first the upper smaller cross-sectional and then the larger lower cross-sectional coils compress together. In order to provide a stable load bearing contact surface between adjacent coils they are preferably flat sided as shown at 19A and 19B.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

La présente invention concerne un moteur à combustion interne comportant un carter (1) avec au moins un cylindre. Il est prévu un stator générateur d'électricité (5) fixe par rapport au cylindre. Il est prévu également un piston (3) disposé dans le cylindre pour des cycles de compression alternative et des courses de combustion entre des positions de point mort haut et de point mort bas. Des soupapes d'admission(8) sont prévues pour introduire un mélange d'air ou de carburant dans le cylindre préalablement aux courses de compression et des soupapes de refoulement(9) sont également prévues pour évacuer des gaz d'échappement après les courses de combustion. Le piston (3) est relié à un actionneur linéaire (4) pour se déplacer avec celui-ci de sorte que lors du fonctionnement du moteur, des courses alternatives du piston (3) et de l'actionneur linéaire (4) par rapport au stator (5) de génération d'énergie électrique utile. Le moteur comprend également un ressort hélicoïdal (6) agissant sur le piston pour solliciter le piston (3) vers le point mort haut lors des courses de compression.
PCT/AU2007/001193 2006-09-05 2007-08-22 Moteur à piston libre amélioré WO2008028216A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2006904838 2006-09-05
AU2006904838A AU2006904838A0 (en) 2006-09-05 An improved free-piston engine

Publications (1)

Publication Number Publication Date
WO2008028216A1 true WO2008028216A1 (fr) 2008-03-13

Family

ID=39156715

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2007/001193 WO2008028216A1 (fr) 2006-09-05 2007-08-22 Moteur à piston libre amélioré

Country Status (1)

Country Link
WO (1) WO2008028216A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090322098A1 (en) * 2008-06-27 2009-12-31 Cohen Kenneth J Integrated combustion and electric hybrid engines and methods of making and use thereof
WO2012004184A1 (fr) * 2010-07-06 2012-01-12 Deutsches Zentrum für Luft- und Raumfahrt e.V. Dispositif à pistons libres et procédé pour l'échange des gaz dans un moteur à pistons libres
DE102011101018A1 (de) * 2011-05-10 2012-11-15 Herbert Weh Mechanisch-elektrische Direktumwandlung bei oszilierendem Antrieb und rotierendem Energiespeicher
DE202012009806U1 (de) * 2012-10-15 2014-01-16 Dietmar Kleining Wärmekraftmaschine
US10605081B2 (en) 2016-05-17 2020-03-31 Deutsches Zentrum für Luft- und Raumfahrt e.V. Free-piston device and method for operating a free-piston device
US10612380B2 (en) 2016-05-17 2020-04-07 Deutsches Zentrum für Luft- und Raumfahrt e.V. Free piston device and method for operating a free piston device
US10844718B2 (en) 2016-05-17 2020-11-24 DEUTSCHES ZENTRUM FüR LUFT-UND RAUMFAHRT E.V. Free piston apparatus
US10890070B2 (en) 2016-05-17 2021-01-12 DEUTSCHES ZENTRUM FüR LUFT-UND RAUMFAHRT E.V. Free piston device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2473204A (en) * 1946-02-05 1949-06-14 Participations Soc Et Free piston engine control
US5775273A (en) * 1997-07-01 1998-07-07 Sunpower, Inc. Free piston internal combustion engine
US6199519B1 (en) * 1998-06-25 2001-03-13 Sandia Corporation Free-piston engine
US6651599B2 (en) * 2000-06-09 2003-11-25 Edward Wechner Free-piston engines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2473204A (en) * 1946-02-05 1949-06-14 Participations Soc Et Free piston engine control
US5775273A (en) * 1997-07-01 1998-07-07 Sunpower, Inc. Free piston internal combustion engine
US6199519B1 (en) * 1998-06-25 2001-03-13 Sandia Corporation Free-piston engine
US6651599B2 (en) * 2000-06-09 2003-11-25 Edward Wechner Free-piston engines

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090322098A1 (en) * 2008-06-27 2009-12-31 Cohen Kenneth J Integrated combustion and electric hybrid engines and methods of making and use thereof
US8201523B2 (en) * 2008-06-27 2012-06-19 Cohen Kenneth J Integrated combustion and electric hybrid engines and methods of making and use thereof
WO2012004184A1 (fr) * 2010-07-06 2012-01-12 Deutsches Zentrum für Luft- und Raumfahrt e.V. Dispositif à pistons libres et procédé pour l'échange des gaz dans un moteur à pistons libres
DE102011101018A1 (de) * 2011-05-10 2012-11-15 Herbert Weh Mechanisch-elektrische Direktumwandlung bei oszilierendem Antrieb und rotierendem Energiespeicher
DE102011101018B4 (de) * 2011-05-10 2017-04-20 Herbert Weh Verbrennungsmotor-Antriebseinheit mit mechanisch-elektrischer Direktumwandlung bei oszillierendem Antrieb
DE202012009806U1 (de) * 2012-10-15 2014-01-16 Dietmar Kleining Wärmekraftmaschine
US10605081B2 (en) 2016-05-17 2020-03-31 Deutsches Zentrum für Luft- und Raumfahrt e.V. Free-piston device and method for operating a free-piston device
US10612380B2 (en) 2016-05-17 2020-04-07 Deutsches Zentrum für Luft- und Raumfahrt e.V. Free piston device and method for operating a free piston device
US10844718B2 (en) 2016-05-17 2020-11-24 DEUTSCHES ZENTRUM FüR LUFT-UND RAUMFAHRT E.V. Free piston apparatus
US10890070B2 (en) 2016-05-17 2021-01-12 DEUTSCHES ZENTRUM FüR LUFT-UND RAUMFAHRT E.V. Free piston device

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