WO2007081222A1 - Système de compression variable pour moteurs à combustion interne - Google Patents

Système de compression variable pour moteurs à combustion interne Download PDF

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Publication number
WO2007081222A1
WO2007081222A1 PCT/NZ2006/000002 NZ2006000002W WO2007081222A1 WO 2007081222 A1 WO2007081222 A1 WO 2007081222A1 NZ 2006000002 W NZ2006000002 W NZ 2006000002W WO 2007081222 A1 WO2007081222 A1 WO 2007081222A1
Authority
WO
WIPO (PCT)
Prior art keywords
internal combustion
crankshaft
eccentric shaft
compression system
variable compression
Prior art date
Application number
PCT/NZ2006/000002
Other languages
English (en)
Inventor
Brian Barradine
Original Assignee
Brian Barradine
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 Brian Barradine filed Critical Brian Barradine
Priority to PCT/NZ2006/000002 priority Critical patent/WO2007081222A1/fr
Publication of WO2007081222A1 publication Critical patent/WO2007081222A1/fr

Links

Classifications

    • 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
    • F02D15/04—Varying compression ratio by alteration of volume of compression space without changing 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
    • F02B75/00—Other engines
    • F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
    • F02B75/047—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of variable crankshaft position

Definitions

  • the longer horizontally orientated leg of this connecting rod (lever arm) has a sliding arrangement by which the fulcrum or pivot point can be shifted, thereby effectively altering the length of the connecting rod. This has the effect of not only varying the compression ratio but also of varying the sweep of the piston therefore altering the capacity of the engine.
  • the objective of this invention is to improve the efficiency and performance of the internal combustion engine by mechanically adjusting the compression ratio as required during the running of the engine, thereby making the engine more efficient across a greater range of speeds.
  • Fig 2/4 is a similar view to Fig 1/4 but on a steeper angle looking down from above - This drawing clearly shows all the parts of the invention insitu.
  • Fig 3/4 is a perspective drawing of the cradle part (item 2 all 4 figs)
  • Fig 4/4 is a two part diagram which clearly shows how the rotating of the cradle part (item 2) increases the gap between the piston crowns and the cylinder head.
  • crankshaft support beams/and cradle The pivoting motion of the crankshaft support beams/and cradle is implemented by the rotating movement of an eccentric shaft (item 3 FIG 1&4) which is secured about its concentric axis by bearing caps (item 4 FIG 1 ) which are in turn secured (bolted) to the engine crankcase.
  • the cradle provides a dual function, one of retaining the crankshaft to the crankshaft support beams, and one of retaining the eccentric shaft to the crankshaft support beams
  • eccentric shaft only turns 180° in one direction to lower the compression ratio from its highest setting to its lowest setting, to increase the compression ratio again the eccentric shaft is turned back the opposite way.
  • the eccentric shaft is prevented from rotating more than 180° by a combination of primary hard stops and electronic switching. Rotation of the eccentric shaft is caused by an electronic signal from the ECU (Engine Control Unit) - onboard computer- reaching the electric motor (item 7 FIG 1&4) which is rigidly and solidly mounted to the outside of the crankcase, the electric motor being mounted vertically by way of a flanged base plate (item 23
  • FIG. 4
  • the electric motor directly drives a worm shaft (item 8 FIG 1 ) which penetrates through an aperture in the crankcase to engage with a toothed wheel, (item 9 FIG 1 ) the toothed wheel being an integrated feature of the eccentric shaft.
  • the driven gear incorporates into its design a flange (item 16 FIG 2) suitable for attaching the flywheel (item 17 FIG 2) by means of appropriate bolts as is the convention, the outer circumference of the flange is of a smooth machined finish to accept a circular oil seal between the later and the crankcase to prevent oil contamination of the clutch plates as is also the convention.
  • the land between the flange and the gear serves as a bearing surface to additionally support the driven gear
  • the rear face of the driven gear flange is recessed to accept the gearbox input shaft, this centers the input shaft and acts as a third support for the driven gear.
  • this gear is also driven by a gear keyed to (or part of) the crankshaft (item 19 FIG 2).
  • the purpose of this freewheeling gear is to drive the overhead valve timing gear by way of a suitable chain, the tension of which is unaffected when the cradle pivots due to the fact that the sprocket on the freewheeling gear maintains a constant axis.
  • the sprocket gear is supported near the sprocket end by a crankcase bearing and at the other end by a stub shaft (which is part of the timing chain end crankshaft support beam) which penetrates into a hole in the rear surface of the sprocket gear.

Abstract

La présente invention concerne un mécanisme pour faire varier le rapport de compression d'un moteur à combustion interne tandis que le moteur est en fonctionnement, qui comprend plusieurs poutres (1) auxquelles le vilebrequin est fixé fermement par un berceau (2). Le berceau (2) et les poutres (1) s'inclinnt sour l'action de la rotation d'un arbre excentrique (3), baissant ou levant ainsi l'enssembl vilebrequin, ce qui a pour effet de faire varier l'écart entre la calotte de piston et la culasse de cylindre, réduisant ou augmentant ainsi le rapport de compression en conséquence.
PCT/NZ2006/000002 2006-01-16 2006-01-16 Système de compression variable pour moteurs à combustion interne WO2007081222A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/NZ2006/000002 WO2007081222A1 (fr) 2006-01-16 2006-01-16 Système de compression variable pour moteurs à combustion interne

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/NZ2006/000002 WO2007081222A1 (fr) 2006-01-16 2006-01-16 Système de compression variable pour moteurs à combustion interne

Publications (1)

Publication Number Publication Date
WO2007081222A1 true WO2007081222A1 (fr) 2007-07-19

Family

ID=38256553

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NZ2006/000002 WO2007081222A1 (fr) 2006-01-16 2006-01-16 Système de compression variable pour moteurs à combustion interne

Country Status (1)

Country Link
WO (1) WO2007081222A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2468486A (en) * 2009-03-09 2010-09-15 Trevor Derek Chesterton Variable compression ratio internal combustion engine with displaceable crankshaft
EP2792846A1 (fr) 2013-04-19 2014-10-22 Capricorn Automotive GmbH Moteur à combustion interne à double vilebrequin

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3601528A1 (de) * 1986-01-20 1987-07-23 Wolfgang Schwarz Brennkraft-kolbenmaschine, reihenmotor mit variablem verdichtungsverhaeltnis
FR2647508A1 (fr) * 1989-05-26 1990-11-30 Jurkovic Dimitri Moteur a combustion interne a taux de compression variable
FR2669676A1 (fr) * 1990-11-23 1992-05-29 Jurkovic Dimitri Paliers permettant de faire varier le taux de compression d'un moteur a combustion interne.
US6789515B1 (en) * 1999-11-30 2004-09-14 Institut Francais Du Petrole Method and device for modifying the compression rate to optimize operating conditions of reciprocating piston engines
US20050016476A1 (en) * 2003-07-25 2005-01-27 Masami Sakita Engine with a variable compression ratio

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3601528A1 (de) * 1986-01-20 1987-07-23 Wolfgang Schwarz Brennkraft-kolbenmaschine, reihenmotor mit variablem verdichtungsverhaeltnis
FR2647508A1 (fr) * 1989-05-26 1990-11-30 Jurkovic Dimitri Moteur a combustion interne a taux de compression variable
FR2669676A1 (fr) * 1990-11-23 1992-05-29 Jurkovic Dimitri Paliers permettant de faire varier le taux de compression d'un moteur a combustion interne.
US6789515B1 (en) * 1999-11-30 2004-09-14 Institut Francais Du Petrole Method and device for modifying the compression rate to optimize operating conditions of reciprocating piston engines
US20050016476A1 (en) * 2003-07-25 2005-01-27 Masami Sakita Engine with a variable compression ratio

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2468486A (en) * 2009-03-09 2010-09-15 Trevor Derek Chesterton Variable compression ratio internal combustion engine with displaceable crankshaft
EP2792846A1 (fr) 2013-04-19 2014-10-22 Capricorn Automotive GmbH Moteur à combustion interne à double vilebrequin

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