WO1995012750A1 - Dispositif de regulation de course pour l'admission commandee par soupape en disque dans un moteur deux temps - Google Patents

Dispositif de regulation de course pour l'admission commandee par soupape en disque dans un moteur deux temps Download PDF

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Publication number
WO1995012750A1
WO1995012750A1 PCT/IT1994/000118 IT9400118W WO9512750A1 WO 1995012750 A1 WO1995012750 A1 WO 1995012750A1 IT 9400118 W IT9400118 W IT 9400118W WO 9512750 A1 WO9512750 A1 WO 9512750A1
Authority
WO
WIPO (PCT)
Prior art keywords
stroke
hub
handed
engine
splined
Prior art date
Application number
PCT/IT1994/000118
Other languages
English (en)
Inventor
Marco Moroni
Original Assignee
Marco Moroni
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 Marco Moroni filed Critical Marco Moroni
Publication of WO1995012750A1 publication Critical patent/WO1995012750A1/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
    • F01L7/00—Rotary or oscillatory slide valve-gear or valve arrangements
    • F01L7/06—Rotary or oscillatory slide valve-gear or valve arrangements with disc type valves

Definitions

  • This invention regards a stroke-regulating device for a two-stroke explosion engine whose induction (inlet) is controlled by a rotating disk valve.
  • the fuel mixture induction ports of two- stroke engines are not bored out through the cylinder walls, but through the sump case walls. During its stroke, the piston opens and covers the exhaust and scavenge ports only.
  • two-stroke engines do not have a specific timing device. It is in fact the piston itself that performs also this function during its stroke.
  • induction takes place in the engine case and can be tuned by several devices, among which flexible-segment valves and rotating disk valves. The rotating disk valve is fit for a more accurate timing, optimizing the engine running at a given speed.
  • a shutter usually in the shape of a disk sector, is splined at one end of the driving shaft and rotates inside a recess so that the rotating shutter closes and opens the fuel mixture induction port in step with the driving shaft rotation.
  • the rotating shutter geometry e.g. the angular amplitude of the sector of a circle
  • the induction stroke should change so as to keep optimum running SUBSTITUTE SHEET conditions.
  • the inlet port opening intervals should increase too, and vice versa.
  • This device should regulate the fuel mixture induction stroke automatically, through actuation mechanisms that can be precisely controlled according to the instant value assessment of one or several engine running parameters.
  • This device can be continuously operated by a simple actuator that can be electrically or hydraulically controlled according to the result of the processing of a theoretically unlimited number of variables.
  • the stroke-regulating device of this invention consists of a first and a second actuator disk which are integral with a first and a second bush respectively, one bush having internal right- handed helicoidal toothing and the other a left-handed helicoidal toothing.
  • the two bushes engage with corresponding helicoidal right-handed and left-handed toothings of a splined hub, which can freely slide along the splined end of the driving shaft.
  • the hub can be axially shifted along the splined end of the driving shaft by means of a control shank rotatably assembled in a bearing.
  • the toothed bushes and their respective actuator disks are restrained from shifting axially along with the hub. This forces the bushes to rotate in mutually opposite directions when, through the control shank, the toothed hub is axially moved along the sliding coupling with the driving shaft end.
  • the shifting control to the shank can be transmitted by any mechanical, electro-mechanical or hydraulic gear commanded by a stroke-control signal that can be output by a control CPU which may process, in real time, signals corresponding to the instantaneous values of the engine running parameters (i.e. gas valve opening, temperature, exhaust gas pressure, r.p.m., etc.), and
  • HEET generate an adjusting signal according to a given algorithm.
  • the control CPU may consist of a microprocessor which, beside processing a variety of electric signals, may output an adjusting electric signal that can be converted into a mechanical stroke for shifting the above-mentioned control shank through a proper electro ⁇ mechanical actuator.
  • the adjustment may also be hand-operated through an appropriate control member, according to one's own sensitivity or to displayed engine running conditions.
  • the stroke-regulating device of this invention allows a constant adjustment while the engine is running without being tied to pre-settings performed while the engine is idle.
  • Figure 1 is a schematic partial cross-section showing the stroke-regulating device of this invention
  • Figure 2 is a detailed partial cross-section of the sliding hub, provided with external toothings and the relevant control shank;
  • Figure 3 shows an alternative embodiment of the device
  • Figures 4 and 5 illustrate one of the two sector disks installed on its corresponding toothed bush
  • Figures 6 and 7 illustrate the other sector disk, with its corresponding toothed bush
  • FIGS 8 and 9 are diagrams outlining the operation of the stroke-regulating device of this
  • the stroke-regulating device of this invention is outlined in Fig. 1 according to a first embodiment.
  • Fig. 1 outlines a piston 1, a connecting rod 2, a connecting rod pin 3, a flywheel 4, a main journal 5, mounted on a main bearing 6, installed in the engine case 7, through which the fuel mixture induction passage 8 is formed.
  • the inlet port 8 is formed also through the shutter mechanism closing cover 9. Inside a space 10, as defined by assembling together the cover 9 and case body 7, a disk shutter, splined on one end of the motor shaft 5 rotates determining the opening and closing strokes of the inlet port 8.
  • the rotating shutter is made up of two overlapping rotating sectors or disks 11 and 12, respectively.
  • Disk 11 is integral with its bush 13
  • rotating disk 12 is integral with its corresponding bush 14.
  • Both bushes have an internal toothing, a right-handed and a left-handed one respectively, which engages with a right-handed and a left-handed toothing, respectively, of a hub 15 with a splined internal surface engaging with a splined end 5s of the assembly making up the motor shaft 5.
  • a control shank 16 is rotatably mounted on one end of hub 15 through the bearing 17.
  • Control shank 16 can be fitted with a rack toothing 18, with which gear 19 of the driving gear, designated as a whole as 20, engages.
  • the driving gear may include a pulley 21 operated by a control cable.
  • Disks 11 and 12 which are mounted on their respective bushes 13 and 14, cannot translate axially, thus forcing bushes 13 and 14, engaged with the external toothings of hub 15, to rotate in opposite
  • the rotation in opposite directions of the sector disks 11 and 12 changes the angular amplitude of the rotating shutter made up of the normally overlapping disks 11 and 12, following an axial shifting of the sliding hub 16. This allows the inlet stroke to be adjusted while the engine is running, irrespectively of calibrations or pre-setting that may have been performed with the engine in an idle condition.
  • the adjustment control can result from a real time optimization process taking into account several engine running factors or parameters. This allows the efficiency and/or performance of the engine to be optimized under any running conditions, according to the specifications selected by the user to meet particular requirements.
  • the members for controlling the axial movement of hub 15 can be arranged also in a different way from the one shown in Fig. 1.
  • sliding hub 15 has a cylindrical "stem- glass shaped", internally splined body provided with external, right-handed and left-handed toothings, respectively, engaging with corresponding bushes 13 and 14.
  • This hub is placed at one end of shank 16, which is held in the crankshaft bearing 22 of cover 9.
  • bearing 17, mounted on one end of control shank 16, is connected to control arm 23.
  • Figures 4 and 5 show one of the two overlapping sector disks forming the rotating shutter, namely disk 11 mounted on the right-handed toothed bush 13
  • the disk may have the shape of a semicircular sector.
  • Disk 12 mounted on the corresponding left-handed toothed bush 14 is shown in Figures 6 and 7. Also this disk controlling the closing of inlet duct 8 can have the shape of a semicircular sector. Naturally, the function performed by disks 11 and 12 making up the rotating shutter can be inverted according to the embodiment selected ad the design stage.
  • Figures 8 and 9 outline the running of the stroke- regulating device of this invention.
  • the diagram on Fig. 8 shows a borderline case regarding high speeds, wherein both disks 11 and 12 (both with a semicircular shape) are completely overlapped, so as to create an effective geometry of the rotating shutter in a form of a semicircular sector.
  • FIG. 9 A typical low engine speed adjustment is illustrated in Fig. 9. Under these low engine speed conditions, hub 15 has been moved with respect to the position it held in Fig. 8, causing bushes 13 and 14 to rotate simultaneously in opposite directions resulting in a corresponding relative arrangement of the semicircular- shaped disks 12 and 11. This arrangement produces an effective geometry of the rotating shutter (made up of the two overlapping disks) as illustrated. In Fig. 9, the edge of disk 11 controls the opening stroke of the inlet duct 8, whereas the edge of disk 12 controls the closing stroke of the inlet duct 8.
  • control system of the stroke-regulating device of this invention can be implemented in different ways, as experienced readers will readily appreciate.
  • a microprocessor capable of handling and processing a plurality of input data (in the form of electric signals) , regarding instantaneous values of the engine running parameters, will provide the broadest possibility of optimization of the engine performance under a wide range of operating conditions.
  • stroke adjustment can be controlled by appropriate transducers that may monitor the engine speed, the exhaust gas pressure and/or other parameters which may be particularly important in view of the peculiar optimization that is required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

L'invention concerne un disque obturateur rotatif pour la régulation de la course d'admission dans un moteur deux temps. Ce disque se compose de deux disques formant secteurs (11, 12) se chevauchant et pouvant coulisser, raccordés à des bagues (13, 14), de manière à être solidaires de ces dernières. Une bague est pourvue d'une denture hélicoïdale gauche et l'autre d'une denture hélicoïdale droite. Les bagues (13, 14) supportant les secteurs se mettent en prise pour coopérer avec les dentures hélicoïdales gauche et droite d'un moyeu (15). Ce dernier se met en prise par sa propre cannelure avec une extrémité cannelée (5s) de l'arbre moteur (5). Le moyeu (15) peut être déplacé par coulissement le long de l'extrémité cannelée (5s) de l'arbre moteur (5) par une tige d'actionnement (16) montée rotative. Lors du déplacement longitudinal du moyeu (15) le long de l'axe de l'arbre (5), les secteurs (11, 12) montés sur la bague sont mis en rotation dans des directions opposées, ce qui fait varier l'amplitude angulaire de l'obturateur rotatif du conduit d'aspiration (8). Une régulation continue de la course est ainsi assurée par la tige montée rotative (16) lorsque le moteur tourne. Une unité de traitement centrale (CPU) peut réguler la course en fonction des valeurs instantanées d'une pluralité de paramètres, en se fondant sur un certain algorithme pour l'optimisation en temps réel du rendement du moteur.
PCT/IT1994/000118 1993-11-03 1994-07-20 Dispositif de regulation de course pour l'admission commandee par soupape en disque dans un moteur deux temps WO1995012750A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT93MI002325A IT1266655B1 (it) 1993-11-03 1993-11-03 Variatore di fase per motori due tempi ad ammissione regolata da valvole a disco
ITMI93A002325931103 1993-11-03

Publications (1)

Publication Number Publication Date
WO1995012750A1 true WO1995012750A1 (fr) 1995-05-11

Family

ID=11367132

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT1994/000118 WO1995012750A1 (fr) 1993-11-03 1994-07-20 Dispositif de regulation de course pour l'admission commandee par soupape en disque dans un moteur deux temps

Country Status (2)

Country Link
IT (1) IT1266655B1 (fr)
WO (1) WO1995012750A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0915238A2 (fr) * 1996-07-22 1999-05-12 Evgeny Nikolaevich Zakharov Moteur a combustion interne avec distribution des gaz par fentes
WO2013001037A3 (fr) * 2011-06-30 2013-02-21 Arens Gmbh Metallbau & Bauschlosserei Ensemble tiroir rotatif plan
ITTO20120392A1 (it) * 2012-05-02 2013-11-03 Claudio Gentile Sistema di distribuzione innovativo per motori a combustione interna
US9328658B2 (en) 2011-06-30 2016-05-03 Arens Gmbh Metallbau & Bauschlosserei Fuel distribution block
US9341151B2 (en) 2011-06-30 2016-05-17 Arens Gmbh Metallbau & Bauschlosserei Fuel pump

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3219796A1 (de) * 1982-05-26 1983-12-01 Hans-Peter 8998 Lindenberg Messmer Steuereinrichtung zur periodischen steuerung eines gas- oder fluessigkeitsstromes
EP0461587A2 (fr) * 1990-06-09 1991-12-18 Yamaha Hatsudoki Kabushiki Kaisha Cycle à moteur
US5257601A (en) * 1993-02-01 1993-11-02 Coffin David F Adjustable rotary valve assembly for a combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3219796A1 (de) * 1982-05-26 1983-12-01 Hans-Peter 8998 Lindenberg Messmer Steuereinrichtung zur periodischen steuerung eines gas- oder fluessigkeitsstromes
EP0461587A2 (fr) * 1990-06-09 1991-12-18 Yamaha Hatsudoki Kabushiki Kaisha Cycle à moteur
US5257601A (en) * 1993-02-01 1993-11-02 Coffin David F Adjustable rotary valve assembly for a combustion engine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0915238A2 (fr) * 1996-07-22 1999-05-12 Evgeny Nikolaevich Zakharov Moteur a combustion interne avec distribution des gaz par fentes
EP0915238A4 (fr) * 1996-07-22 2001-01-31 Evgeny Nikolaevich Zakharov Moteur a combustion interne avec distribution des gaz par fentes
WO2013001037A3 (fr) * 2011-06-30 2013-02-21 Arens Gmbh Metallbau & Bauschlosserei Ensemble tiroir rotatif plan
US9328658B2 (en) 2011-06-30 2016-05-03 Arens Gmbh Metallbau & Bauschlosserei Fuel distribution block
US9341151B2 (en) 2011-06-30 2016-05-17 Arens Gmbh Metallbau & Bauschlosserei Fuel pump
US9371752B2 (en) 2011-06-30 2016-06-21 Arens Gmbh Metallbau & Bauschlosserei Rotary disk valve arrangement
ITTO20120392A1 (it) * 2012-05-02 2013-11-03 Claudio Gentile Sistema di distribuzione innovativo per motori a combustione interna

Also Published As

Publication number Publication date
ITMI932325A0 (it) 1993-11-03
IT1266655B1 (it) 1997-01-09
ITMI932325A1 (it) 1995-05-03

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