EP0078561B1 - Moteur à combustion interne à pistons libres, avec came à commande indépendante - Google Patents

Moteur à combustion interne à pistons libres, avec came à commande indépendante Download PDF

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Publication number
EP0078561B1
EP0078561B1 EP82201290A EP82201290A EP0078561B1 EP 0078561 B1 EP0078561 B1 EP 0078561B1 EP 82201290 A EP82201290 A EP 82201290A EP 82201290 A EP82201290 A EP 82201290A EP 0078561 B1 EP0078561 B1 EP 0078561B1
Authority
EP
European Patent Office
Prior art keywords
engine
cam
pistons
independent motor
free
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
Application number
EP82201290A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0078561A2 (fr
EP0078561A3 (en
Inventor
Egidio Allais
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.)
Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AT82201290T priority Critical patent/ATE15828T1/de
Publication of EP0078561A2 publication Critical patent/EP0078561A2/fr
Publication of EP0078561A3 publication Critical patent/EP0078561A3/fr
Application granted granted Critical
Publication of EP0078561B1 publication Critical patent/EP0078561B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • F02B75/00—Other engines
    • F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
    • 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

  • the present invention relates to an internal combustion engine with free pistons, specially designed for the actuation of a linear alternator, comprising at least one pair of opposite cylinders whose pistons are reciprocally connected by a rod connected in an intermediate point to the moving element of a linear alternator or other means of using the energy produced.
  • the present invention aims to achieve a free piston engine suitable for being coupled to a generator with linear alternator, which is completely devoid of linkages and gears intended to transmit the mechanical energy produced, and in which however are ensured the execution of the compression stroke even in the event of a lack of combustion, the execution by the pistons of a stroke extending between limits prefixed with precision, and the possibility, in the case of engines with several units, of easy synchronization.
  • an engine of the type considered comprises at least one cam actuated by an independent engine, in a substantially synchronous manner with the displacements of the piston rod, and engaging with pusher means connected to the piston rod, so as not to give rise to a substantial transmission of energy during normal operation, but to limit the stroke of the pistons and to transfer to the latter the energy necessary for the compression in the event of abnormal operation of the free piston engine.
  • the rod of the unit, and consequently the relative pistons are forced to move within the limits er according to the law of movement preset by the cam actuated by its own independent motor.
  • the cam profile and by adjusting its actuation speed adequately, there is the possibility of ensuring that, during normal operation, the law of movement imposed by the cam coincides with the movement spontaneous of the free piston unit, so that no transfer of energy takes place between the cam (and therefore its independent motor) and the pusher (and therefore the free piston motor).
  • the presence of the cam positively prevents that, due to any malfunction of the functioning, the free pistons can exceed the stroke limits which have been assigned to it, and, in the event of an accidental omission of one or more combustions, the cam intervenes by driving, by the pusher, the rod of the unit and thus making accomplish the compression stroke which otherwise could not have taken place.
  • the cam in the case of engines having several units, it suffices to establish synchronization between the respective cams, to obtain complete synchronization of the different units.
  • a free piston engine according to the invention gives a much higher overall efficiency than traditional piston engines and even somewhat higher than that of turbines of the same power; a strong economy is also achievable in consumption lubricating oil, while the reduced pollution characteristics of free piston engines can be exploited in the most favorable way.
  • the cam with independent engine can be used for starting the engine, if it is considered appropriate, as an alternative to compressed air systems or for the temporary use, as engine, of the linear alternator, systems known to present for free piston engines.
  • the invention also relates to special arrangements for an engine of the indicated type, and in particular a magnetic support for the elimination of the load applied to the walls of the cylinders, in large engines, because of the weight of the moving parts; and provisions for correct operation in engines with coal dust or other solid fuel feed.
  • auxiliary service parts such as the lights, the valves, the injectors, the washing, cooling and lubrication means, and so on, parts thereof which belong to the known technique and do not need to be modified for the application of the invention.
  • the unit shown in Figure 1 comprises two opposite cylinders 1 and 2, in which are arranged the pistons, 3 and 4 respectively, rigidly connected to each other by a rod 5 which, in an intermediate point, supports the means of use, in this case the inductor 6, for example with permanent magnet, of a linear alternator 7.
  • These parts form a free piston engine with electric generator, of a type which by itself has already been proposed by the same applicant, in which the compression stroke of each cylinder is activated by expansion in the opposite cylinder, so that in normal operation it is not necessary to use auxiliary means to activate the compression, while that the stroke limits are imposed (but in a non-rigid manner) by the compressive strength of the mixture intended to give rise to successive combustion.
  • a cam 11 is provided, carried and actuated by an independent eccentric motor 9, and engaging with a pusher secured to the rod 5 of the unit.
  • This pusher may be constituted by a pair of robust pins 8, possibly with rollers, or by a groove in the rod 5 or other equivalent means; the cam is illustrated as having a circular profile, but it is understood that its profile can be preset in an appropriate manner for the best operation of the free piston engine.
  • the independent motor 9 is controlled in such a way that the rotation of the cam 11 is substantially synchronous with the operation of the free piston engine, so that in normal operation the engagement between the cam 11 and the pusher 8 is only virtual and does not involve any resistance or transmission of energy.
  • the rod 5 tends not to stop at the preset stroke limit, the contact between the pusher and the cam becomes active and the stroke of the rod 5, with the pistons 3 and 4, is positively limited.
  • the pusher 8 enters into active cooperation with the cam 11, and the independent motor 9 of the latter provides the energy necessary to effect the compression, thus avoiding the stopping of the free piston engine.
  • the starting of the free piston engine can be carried out by the independent engine 9 when it is not desired to have recourse to compressed air systems or to use the linear alternator as a starting engine, as it is customary for free piston engines.
  • the independent motor 9 is controlled so that the cam 11 tends to slightly advance relative to the movement of the pusher 8, thereby avoiding any obstacle, under normal conditions, to the movement of the rod 5 and, by therefore, the operation of the free piston engine.
  • the cam 11 is provided with a balancing mass 10. This mass can be modified with respect to what is necessary for the balancing of the cam itself, with the aim of achieving partial balancing of the free piston engine, which by itself is not balanced.
  • the independent motor 9 must be of a type capable of providing greater torque if necessary, without appreciably changing its own speed. It may therefore be a bypass excitation motor, a metasearch engine or an electric motor provided with an appropriate electronic control device. Appropriate means can be used to disconnect the linear alternator during the periods in which the independent motor 9 has to cope with the lack of function. of the free piston engine, so as to limit the load applied to the independent engine.
  • Figures 3 and 4 show an arrangement of two units similar to that shown in Figures 1 and 2, which in itself is balanced and requires a single cam for the service of the two units, further establishing a rigid synchronism between them .
  • the two units of which the one on the right is indicated by the same references of the unit described above, and the one on the left is indicated by corresponding references provided with an apex, are arranged symmetrically, with the pistons 3 and 3 ' opposite one another in a single central cylinder 1 '; the cam 12 (which in this case cannot be circular but must be substantially elliptical or oval) has at least one axis of symmetry and cooperates with the two pushers 8 and 8 'of the rods 5 and 5'.
  • a second cam 12 ′ having its own independent motor 9 ′ or kinematically connected to the first cam 12, can be arranged as shown in FIG. 4.
  • the load applied to the cam by the pushers in the event of serious disturbances, can become very high, and this in correspondence of the points of maximum and minimum distance of the cam from its center.
  • support means 30 to the 'inside the cam, and 31 outside thereof arranged so as to be touched by the cam pendantsa normal rotation; in the event of a strong overload, the cam undergoes a slight elastic deformation and bears against said means 30 and 31, thus discharging the excess stress received.
  • the support means 30 and 31 may be with rollers, or they may also be fixed, in this case accepting the braking effect which they exert on the cam when the latter touches them; which does not seem serious considering the very low frequency of this event.
  • the cams can be projected with a view to their normal normal load and not to the maximum load foreseeable in exceptional cases, such as for example rupture of the piston rings or the like.
  • the cams can be of light construction, for example in ribbed sheet metal.
  • the motor according to the invention already having by itself a high yield and a specific power, it is possible to produce according to the invention motors of reduced overall weight and size compared to normal motors of the same power, this which, as we know, is of particular importance to the industry.
  • the invention provides for magnetic support of the mobile parts, as shown in FIG. 6.
  • the rods 5 and 5 ′ are provided, in this case, with slides 13, 14, 13 ′, 14 ′ sliding above supports 15, 16, 15 ', 16'; both the slides and the supports are permanently magnetized so that the respective homonymous poles are arranged one opposite the other and repel each other.
  • the arrangement proves to be particularly suitable when linear generators having several inductors and armatures are used, as shown in FIGS. 5 and 6, with the aim of obtaining from the alternators a current having a behavior closer to the sinusoidal behavior.
  • the invention can be applied to free piston engines both for carburetion and for injection of liquid or gaseous fuel and with spark or compression ignition.
  • the invention also advantageously lends itself to the production of adiabatic motors with feeding by coal dust or other solid fuel.
  • special provisions must be used either to obtain the engine's adiabaticity, or to promote the elimination of ash from combustion.
  • Figures 7 and 8 show such arrangements respectively for a cylinder 17 with opposite pistons (corresponding to the cylinder 1 'of the previous figures) and for an end cylinder 18.
  • the current produced by the linear alternators which as a rule does not have a satisfactory sinusoidal behavior, cannot be used such that, as shown in FIG. 9, it can be sent from the generator 25 actuated by the engine according to the invention to a rectifier group 26 and then to a DC motor 27 coupled to a flywheel 28, downstream of which the energy produced can be used in any direct or indirect way, for example by driving an alternator 29 capable of supplying a sinusoidal current, or a metagenerator intended to supply traction meta-motors, and so on.
  • the flywheel 28 provides for the uniformity of the torque, even in the event of a lack of some combustion in the cylinders.
  • the flywheel can carry suitable ventilation vanes for cooling the linear alternator of other parts.
  • the engine according to the invention can also be used to directly produce mechanical energy , especially if this energy is used in alternative form, such as for compressors, pumps and the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transmission Devices (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Valve Device For Special Equipments (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
EP82201290A 1981-10-30 1982-10-18 Moteur à combustion interne à pistons libres, avec came à commande indépendante Expired EP0078561B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82201290T ATE15828T1 (de) 1981-10-30 1982-10-18 Freikolbenbrennkraftmaschine mit unabhaengig getriebenem nocken.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT6840781 1981-10-30
IT68407/81A IT1145573B (it) 1981-10-30 1981-10-30 Motore a stantuffi liberi con camma autonoma soecialmente per l azionamento di alternatori lineari

Publications (3)

Publication Number Publication Date
EP0078561A2 EP0078561A2 (fr) 1983-05-11
EP0078561A3 EP0078561A3 (en) 1983-11-09
EP0078561B1 true EP0078561B1 (fr) 1985-09-25

Family

ID=11309302

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82201290A Expired EP0078561B1 (fr) 1981-10-30 1982-10-18 Moteur à combustion interne à pistons libres, avec came à commande indépendante

Country Status (7)

Country Link
EP (1) EP0078561B1 (enrdf_load_stackoverflow)
JP (1) JPS5882023A (enrdf_load_stackoverflow)
AT (1) ATE15828T1 (enrdf_load_stackoverflow)
AU (1) AU552332B2 (enrdf_load_stackoverflow)
DE (1) DE3266566D1 (enrdf_load_stackoverflow)
ES (1) ES8400539A1 (enrdf_load_stackoverflow)
IT (1) IT1145573B (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMN20050017A1 (it) * 2005-03-16 2006-09-17 Attilio Caleffi Produzione energia elettrica da motori a scoppio tramite dinamo lineari
FR2891093B1 (fr) * 2005-09-16 2007-10-26 Schneider Electric Ind Sas Declencheur electronique pourvu de moyens de surveillance, disjoncteur comportant un tel declencheur et procede de surveillance.
US8662029B2 (en) 2010-11-23 2014-03-04 Etagen, Inc. High-efficiency linear combustion engine
US9719415B2 (en) 2015-01-15 2017-08-01 Etagen, Inc. Energy storage and conversion in free-piston combustion engines

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB435750A (en) * 1934-05-26 1935-09-26 Fernand Radelet Improvements in driving cams for internal combustion engines
CH536936A (de) * 1971-04-26 1973-05-15 Sulzer Ag Kolbenbrennkraftmaschine mit hydrostatischem Triebwerk
FR2279933A1 (fr) * 1974-07-25 1976-02-20 Guillon Marcel Nouveau moteur a combustion interne du cycle deux ou quatre temps fonctionnant aux carburants essence ou gasoil avec compresseur d'air (sans bielles ni vilebrequin)
US3995427A (en) * 1975-05-15 1976-12-07 Resonance Motors, Inc. Multiple-phase combustion engine embodying hydraulic drive
FR2473625A1 (fr) * 1980-01-11 1981-07-17 Vironneau Pierre Moteur rectilineaire a quatre temps et groupes-moteurs comportant un tel moteur rectilineaire

Also Published As

Publication number Publication date
EP0078561A2 (fr) 1983-05-11
JPH0263093B2 (enrdf_load_stackoverflow) 1990-12-27
ATE15828T1 (de) 1985-10-15
ES516602A0 (es) 1983-11-01
AU552332B2 (en) 1986-05-29
JPS5882023A (ja) 1983-05-17
AU8983982A (en) 1983-05-05
EP0078561A3 (en) 1983-11-09
DE3266566D1 (en) 1985-10-31
IT1145573B (it) 1986-11-05
IT8168407A0 (it) 1981-10-30
ES8400539A1 (es) 1983-11-01

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