EP0434646A1 - System zur Veränderung des obersten Totpunktes einer Brennkraftmaschine - Google Patents

System zur Veränderung des obersten Totpunktes einer Brennkraftmaschine Download PDF

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Publication number
EP0434646A1
EP0434646A1 EP90830607A EP90830607A EP0434646A1 EP 0434646 A1 EP0434646 A1 EP 0434646A1 EP 90830607 A EP90830607 A EP 90830607A EP 90830607 A EP90830607 A EP 90830607A EP 0434646 A1 EP0434646 A1 EP 0434646A1
Authority
EP
European Patent Office
Prior art keywords
piston
wheel
shaft
pin
head
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.)
Withdrawn
Application number
EP90830607A
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English (en)
French (fr)
Inventor
Giovanni Santoro
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
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0434646A1 publication Critical patent/EP0434646A1/de
Withdrawn legal-status Critical Current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
    • F02B75/045—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable connecting rod length
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D15/00—Varying compression ratio
    • F02D15/02—Varying compression ratio by alteration or displacement of piston stroke
    • 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
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder

Definitions

  • the present invention relates to a system to change with continuity and under control during running the position of the pistons of internal-combustion engines at the top dead center of the operating cycle.
  • both the position of the piston with respect to the connecting rod small end connected thereto and the position of the driving shaft with respect to the engine block can be varied.
  • the electronic control of the different parameters used in modern engines allows a number of such parameters to be optimized under different operating conditions. Among them spark advance, stroke variation, injection conditions, a.s.o. should be mentioned.
  • the power of the internal-combustion engine is varied by metering the amount of the fuel mixture injected into the cylinder. This is carried out by controlling the opening of the throttle valve of the carburetor or the injectors of the mechanical or electronic injection system.
  • the present invention seeks therefore to provide a system by which the volume of the combustion chamber can be varied by changing the relative position of the piston when the motor is running.
  • Each shaft is connected to a positioning means defining the angular position thereof with respect to the connecting rod small end and inside the latter so that the piston at the top dead center can assume a continuously variable position between a minimum and a maximum with respect to a stationary reference center such as the motor head.
  • a positioning means defining the angular position thereof with respect to the connecting rod small end and inside the latter so that the piston at the top dead center can assume a continuously variable position between a minimum and a maximum with respect to a stationary reference center such as the motor head.
  • the control of the positioning means defining the position of the shaft within each connecting rod small end can be accomplished in several ways, preferably by interlocking to a known electronic control unit which controls said means according to the other operation parameters of the motor.
  • the single-cylinder motor shown together with its parts involved by the invention provides a cylinder 10, a head 11 with intake and exhaust valves 12 and 13, a piston 14 slideable within cylinder 10, a connecting rod 15 having a connecting rod small end 16 and a big end 18, and a crank shaft 19.
  • piston pin 20 pivotally mounted on piston skirt 14 is eccentrically supported by a shaft 22 which is surrounded by connecting rod small end 16. Integral with shaft 22 is head 23 of control lever 24, to the lower end of which one end of a toggle lever 25 is attached. Attached to the other end of toggle lever 25 is a connecting member 26 schematically shown in Fig. 1, which can be driven, for example, through suitable, driving means (here not shown) by the control means setting the throttle valve VF of the carburetor, namely the accelerator of the motor vehicle.
  • Fig. 1 top dead center
  • Fig. 2 bottom dead center
  • FIGs. 6-8 a second embodiment of the invention is shown.
  • Driving shaft 49 is eccentrically mounted with respect to bearings SP of base BT because of the interposition of two intermediate eccentric supports 50. Integral with both supports 50 is a control member 51 the angular position of which can be set by suitable adjusting means so as to set the angular position of supports 50.
  • the position of driving shaft 49 with respect to head 111 will vary continuously as a function of the angular position of supports 50 between a lowered position (Fig. 6), in which the volume of combustion chamber 130 is the greatest, and a raised position in which the volume of combustion chamber 130 is the smallest (Fig. 7).
  • Fig. 1bis shows, less schematically, the single-cylinder engine of fig. 1 and an embodiment of the driving means controlling the position of the shaft, whereon the small end of connecting rod is eccentrically mounted.
  • connecting device 26 comprises a wheel 60, a rod 61, directly connected to the accelerator of the engine integral with wheel 60 and a link 62.
  • End 63 of toggle lever 25 is connected to pin 64 eccentrically mounted on wheel 60 while end 65 of link 62 has a slot wherein a second pin 66 is fitted, eccentrically mounted on wheel 60, diametrically opposite to pin 64.
  • piston 14 will be in a higher position, in respect of base BT, continously from bottom dead center to top dead center.
  • Reference BT indicates the engine base whereon crank shaft 19 is pivotally mounted
  • Reference IM indicates the engine intake manifold containing throttle valve VF of the carburetor (not shown) and ending on the intake opening controlled by intake valve 12 while exhaust manifold (controlled by exhaust valve 13) in not shown.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
EP90830607A 1989-12-21 1990-12-20 System zur Veränderung des obersten Totpunktes einer Brennkraftmaschine Withdrawn EP0434646A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT4868789 1989-12-21
IT04868789A IT1237263B (it) 1989-12-21 1989-12-21 Sistema per variare con continuita' e a volonta' durante la marcia la posizione dei pistoni dei motori a combustione interna al punto morto superiore del ciclo di funzionamento.

Publications (1)

Publication Number Publication Date
EP0434646A1 true EP0434646A1 (de) 1991-06-26

Family

ID=11268048

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90830607A Withdrawn EP0434646A1 (de) 1989-12-21 1990-12-20 System zur Veränderung des obersten Totpunktes einer Brennkraftmaschine

Country Status (2)

Country Link
EP (1) EP0434646A1 (de)
IT (1) IT1237263B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2119077C1 (ru) * 1998-02-24 1998-09-20 Конюхов Виталий Алексеевич Способ регулирования мощности многотопливного двигателя внутреннего сгорания методом изменения фаз газораспределения и рабочего объема цилиндров и многотопливный двигатель внутреннего сгорания
WO2001092700A1 (de) * 2000-05-29 2001-12-06 Meta Motoren- Und Energie-Technik Gmbh Vorrichtung zum verändern der verdichtung eines zylinders einer hubkolbenbrennkraftmaschine
JP2012241678A (ja) * 2011-05-24 2012-12-10 Nissan Motor Co Ltd 内燃機関の複リンク式ピストン−クランク機構
KR101305797B1 (ko) 2011-11-22 2013-09-06 현대자동차주식회사 가변 압축비 기구유닛

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB412781A (en) * 1933-07-26 1934-07-05 Leo Vitalba Improvements relating to means for varying the compression ratio of internal combustion engines
FR807242A (fr) * 1936-06-08 1937-01-07 Kenjiro Tsuneda Perfectionnements aux moteurs à explosion comportant des moyens pour faire varier le taux de compression
JPS5838344A (ja) * 1981-08-31 1983-03-05 Toyota Motor Corp 内燃機関の可変圧縮比機構
JPS5857040A (ja) * 1981-09-29 1983-04-05 Toyota Motor Corp 内燃機関の可変圧縮比機構
EP0297904A2 (de) * 1987-07-03 1989-01-04 Honda Giken Kogyo Kabushiki Kaisha Vorrichtung zum Verändern des Kompressionsverhältnisses für Brennkraftmaschinen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB412781A (en) * 1933-07-26 1934-07-05 Leo Vitalba Improvements relating to means for varying the compression ratio of internal combustion engines
FR807242A (fr) * 1936-06-08 1937-01-07 Kenjiro Tsuneda Perfectionnements aux moteurs à explosion comportant des moyens pour faire varier le taux de compression
JPS5838344A (ja) * 1981-08-31 1983-03-05 Toyota Motor Corp 内燃機関の可変圧縮比機構
JPS5857040A (ja) * 1981-09-29 1983-04-05 Toyota Motor Corp 内燃機関の可変圧縮比機構
EP0297904A2 (de) * 1987-07-03 1989-01-04 Honda Giken Kogyo Kabushiki Kaisha Vorrichtung zum Verändern des Kompressionsverhältnisses für Brennkraftmaschinen

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 7, no. 120 (M-217)(1265) 25 May 1983, & JP-A-58 38344 (TOYOTA JIDOSHA KOGYO K.K.) 5 March 1983, *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 145 (M-224)(1290) 24 June 1983, & JP-A-58 57040 (TOYOTA JIDOSHA KOGYO K.K.) 5 April 1983, *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2119077C1 (ru) * 1998-02-24 1998-09-20 Конюхов Виталий Алексеевич Способ регулирования мощности многотопливного двигателя внутреннего сгорания методом изменения фаз газораспределения и рабочего объема цилиндров и многотопливный двигатель внутреннего сгорания
WO2001092700A1 (de) * 2000-05-29 2001-12-06 Meta Motoren- Und Energie-Technik Gmbh Vorrichtung zum verändern der verdichtung eines zylinders einer hubkolbenbrennkraftmaschine
US6581552B2 (en) 2000-05-29 2003-06-24 Meta Motoren-Und Energie-Technik Gmbh Apparatus for changing the compression of a cylinder of a piston engine
JP2012241678A (ja) * 2011-05-24 2012-12-10 Nissan Motor Co Ltd 内燃機関の複リンク式ピストン−クランク機構
KR101305797B1 (ko) 2011-11-22 2013-09-06 현대자동차주식회사 가변 압축비 기구유닛

Also Published As

Publication number Publication date
IT1237263B (it) 1993-05-27
IT8948687A0 (it) 1989-12-21
IT8948687A1 (it) 1991-06-21

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