FR2503258A1 - EXHAUST DEVICE OF A TWO-STAGE INTERNAL COMBUSTION ENGINE - Google Patents

EXHAUST DEVICE OF A TWO-STAGE INTERNAL COMBUSTION ENGINE Download PDF

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Publication number
FR2503258A1
FR2503258A1 FR8205802A FR8205802A FR2503258A1 FR 2503258 A1 FR2503258 A1 FR 2503258A1 FR 8205802 A FR8205802 A FR 8205802A FR 8205802 A FR8205802 A FR 8205802A FR 2503258 A1 FR2503258 A1 FR 2503258A1
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FR
France
Prior art keywords
exhaust
passages
main passage
cylinder
passage
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.)
Granted
Application number
FR8205802A
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French (fr)
Other versions
FR2503258B3 (en
Inventor
Jan Krivka
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.)
Jawa NP
Original Assignee
Jawa NP
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 Jawa NP filed Critical Jawa NP
Publication of FR2503258A1 publication Critical patent/FR2503258A1/en
Application granted granted Critical
Publication of FR2503258B3 publication Critical patent/FR2503258B3/fr
Granted 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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/028—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation for two-stroke engines
    • F02D13/0284—Variable control of exhaust valves only
    • 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
    • F01L5/00—Slide valve-gear or valve-arrangements
    • F01L5/04—Slide valve-gear or valve-arrangements with cylindrical, sleeve, or part-annularly shaped valves
    • F01L5/06—Slide valve-gear or valve-arrangements with cylindrical, sleeve, or part-annularly shaped valves surrounding working cylinder or 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
    • F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/12—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having slidably-mounted valve members; having valve members movable longitudinally of conduit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/18—Other cylinders
    • F02F1/22—Other cylinders characterised by having ports in cylinder wall for scavenging or charging
    • 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
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Exhaust Silencers (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Characterised By The Charging Evacuation (AREA)

Abstract

The invention relates to an exhaust for a two-stroke internal combustion engine, comprising an exhaust duct with small auxiliary exhaust passages, a control device for the opening time of the small auxiliary exhaust passages and for the flow cross section, and an exhaust pipe. This solves the problem of insufficient exhaust cross section, the flow of exhaust gases on sealing surfaces and is of simpler construction than known devices. According to the invention the outlets of the exhaust duct and the small auxiliary exhaust passages into the cylinder wall are arranged next to one another, the small auxiliary exhaust passages being connected to the exhaust duct by means of a hollow rotary slide valve. The rotary slide valve is connected like a gear mechanism to a control device. The invention may be used on all high-performance two-stroke engines.

Description

La présente invention concerne un dispositif d'echappement pour moteur à combustion interne à deux temps se composant d'un passage principal,de passages auxiliaires , et d'un dispositif pour commander le moment d'ouverture des passages d'échappement ainsi que pour commander une section d'ecoulement de passages et d'une tuyauterie d'échappement. The present invention relates to an exhaust device for a two-stroke internal combustion engine consisting of a main passage, auxiliary passages, and a device for controlling the opening time of the exhaust passages as well as for controlling a passage flow section and an exhaust pipe.

I1 existe des dispositifs connus pour modifier le reglage temporel de l'échappement dans des moteurs à deux temps pendant le fonctionnement du moteur,ces dispositifs comportant un element pivotant qui est placé dans le passage d'echappement d'un cylindre du moteur.Les agencements connus sont pourvus soit d'une soupape à clapet soit une vanne coulissante tournante qui recouvre une partie d'une lumière d'échappement,à savoir une partie supérieure du conduit d'échappement do la chambre de travail du cylindre. I1 existe également des dispositifs connus où la section de sortie est divisée par une cloison separatrice horizontale on deux lumières individuelles,la lumière supérieure étant fermée par uno vanne coulissante pivotante, On a alors affaire à une commande à deux étages. There are known devices for modifying the temporal adjustment of the exhaust in two-stroke engines during engine operation, these devices comprising a pivoting element which is placed in the exhaust passage of an engine cylinder. known are provided with either a flap valve or a rotary sliding valve which covers part of an exhaust port, namely an upper part of the exhaust duct of the working chamber of the cylinder. I1 also exist known devices where the outlet section is divided by a horizontal dividing wall into two individual lumens, the upper lumen being closed by a pivoting sliding valve. We are therefore dealing with a two-stage control.

Le changement de réglage temporel des dispositifs connus est effectué automatiquement,indépendamment du conducteur,en fonction du nombre de tours,de la charge ou d'autres paramètres du moteur. Il existe également un dispositif connu où l'entrée d'un passage d'echappement dans un cylindre est divisée par deux cloisons sépatatrices horizontales en trois lumières indépendantes,qui sont ouverts l'une apras l'autre à l'aide d'une vanne coulissante cylindrique coulissante qui est située dans le passage d'échappement et qui est commandee par un disposi- tif de commande. The change in time setting of the known devices is carried out automatically, independently of the driver, depending on the number of revolutions, the load or other parameters of the engine. There is also a known device where the entry of an exhaust passage into a cylinder is divided by two horizontal separating partitions into three independent lights, which are opened one after the other using a valve. sliding cylindrical sliding which is located in the exhaust passage and which is controlled by a control device.

Les défauts des dispositifs connus consistent dans leur complication*dans leur fonctionnement incorrect et notamment dans une insuffisance de la section de passage des gaz d échappement,qui resultent de La disposition des orifices d'échappement l'un au-dessus de l'autre. Dans certains des dispositifs connus,des gaz chauds s'écoulent le long des surfaces do coussinets de paliets,ce qui introduit un inconve- nient considérable.  The shortcomings of the known devices consist in their complication * in their incorrect operation and in particular in an insufficiency of the cross section of the exhaust gas, which results from the arrangement of the exhaust orifices one above the other. In some of the known devices, hot gases flow along the surfaces of the pad bearings, which introduces a considerable drawback.

Certains des inconvenients mentionnes ci-dessus peuvent être elimines avec le dispositif conforme à l'invention,dont le principe consiste en ce que des entrées du passage principal et des passages auxiliaires dans la paroi du cylindre sont situées l'une à côté de l'autre, et en ce que les bords des entrees des passages auxiliaires dans le cylindre sont situes au-dessus du bord superieur de l'entree du passage principal. Some of the drawbacks mentioned above can be eliminated with the device according to the invention, the principle of which is that inlets of the main passage and auxiliary passages in the wall of the cylinder are located one next to the other, and in that the edges of the entries of the auxiliary passages in the cylinder are situated above the upper edge of the entry of the main passage.

Les passages auxiliaires et le passage principal sont reliés entre eux par une vanne coulissante. Do préférence,la vanne coulissante ,en forme de cylindre creux,pivotante,est située à l'intérieur du passage principal d'échappement et elle est reliée à un dispositif de commande par l'intermédiaire d'une transmission. Des trous ménagës dans la vanne coulissante sont situés dans la zona où des passages auxiliaires d'échappe- ment débouchent dans le passage principal. L'avantage de l'agencement conforme à l'invention consiste dans une ouverture très rapide des passages d'échappement avec une grande section, ce qui est rendu possible pat la disposition des passages auxiliaires à côte du passage principal.L'écoulement des gaz d'échappement dans les passages auxiliaires est command par la vanne coulissante dans la plage comprise entre l'ouver- ture complete des passages auxiliaires et leur fermeture complate. Du fait de la disposition des bords supérieurs des entries des passages auxiliaires dans la paroi du cylindre audessus du bord supérieur du passage principal,la vanne coulissante commande non seulement la section de passage des gaz d'échappement mais le moment d'ouverture du systAme d'ir chappement,ce qui permet la modification désirée du réglage temporel de l'échappement en fonction du nombre de tours,de la charge ,de la temperature ou d'un autra paramètre du moteur.The auxiliary passages and the main passage are interconnected by a sliding valve. Preferably, the sliding valve, in the form of a hollow, pivoting cylinder, is located inside the main exhaust passage and it is connected to a control device via a transmission. Holes in the sliding valve are located in the area where the auxiliary exhaust passages open into the main passage. The advantage of the arrangement in accordance with the invention consists in a very rapid opening of the exhaust passages with a large cross section, which is made possible by the arrangement of the auxiliary passages next to the main passage. The exhaust in the auxiliary passages is controlled by the sliding valve in the range between the complete opening of the auxiliary passages and their complete closure. Due to the arrangement of the upper edges of the entries of the auxiliary passages in the wall of the cylinder above the upper edge of the main passage, the sliding valve controls not only the cross section of the exhaust gas but the opening time of the system. 'ir exhaust, which allows the desired modification of the temporal adjustment of the exhaust according to the number of revolutions, the load, the temperature or another autra parameter of the engine.

L'entrée du passage principal dans la paroi du cylindre peut être constitue par deux fenêtres ou une seule fenêtre.The entry of the main passage into the wall of the cylinder can be constituted by two windows or a single window.

En ce qui concerne les passages auxiliaires ,on peut prévoir soit deux passages places de part et d'autre du passage principal soit un seul passage situe entre les deux entrEes du passage principal. With regard to the auxiliary passages, it is possible to provide either two passages placed on either side of the main passage or a single passage situated between the two entrances of the main passage.

Un avantage du dispositif conforme b l'intention consiste en ce qu'on peut régler a un degré optimal la Section de passage des gaz d'échappement et le rZglage temporel du système d'échappement en fonction des conditions de marche du moteur. Cet avantage permet d'augmenter la puissance fournie dans toute la gamme de vitesses de rotation du moteur, tout en diminuant la consommation de carburant et la teneur en substances nocives des gaz d'échappement. Le dispositif est simple,d'un fonctionnement sar et, même si la vanne coulissan- te est défectueus ,le moteur put fonctionner en cas d'urgen- ce. An advantage of the device according to the intention is that the cross-section of the exhaust gas flow and the temporal adjustment of the exhaust system can be adjusted to an optimum degree according to the running conditions of the engine. This advantage makes it possible to increase the power supplied over the entire range of engine rotation speeds, while reducing fuel consumption and the content of harmful substances in the exhaust gases. The device is simple, functioning sar and, even if the sliding valve is defective, the engine could run in an emergency.

D'autres avantages et caractéristiques de l'invention seront mis en évid@nc@ dans la suite de la description,donnée titre d'exemple non limitatif,en référence aux dessins annexés dans lesquels:
Fig.1 est une coupe longitudinale schématique du moteur,
Fig.2 représente en vue dév@loppé@ une partie d'une chemise d'un cylindre dans la zone du passage d'échappement;
Fig.3 est une coupe horizontal de passages d'échappe- ment.Other advantages and characteristics of the invention will be highlighted @ nc @ in the following description, given by way of nonlimiting example, with reference to the appended drawings in which:
Fig. 1 is a schematic longitudinal section of the engine,
Fig.2 shows in developed view @ a part of a jacket of a cylinder in the area of the exhaust passage;
Fig.3 is a horizontal section of exhaust passages.

Sur la figure l,un vilebrequin 2 relié a une bielle 3 et a son piston 4 ost placé dans un carter I d'un moteur. In FIG. 1, a crankshaft 2 connected to a connecting rod 3 and to its piston 4 is placed in a casing I of an engine.

Un cylindre 5 fermé a l'aide d'une culasse 6 est dispos sur le carter 1. Les gaz d'échappement sortant du moteur s'écou- lent dans un passage principal 7 et des passages auxiliaires 8 pour pénétrer dans un tuyau commun d'échappement 9,qui a été dessine seulement en partie. Une vanne coulissant@ cylindrique 10 est monte te manière b pouvoir pivoter dans le passage principal d'échappement 7. Cette vanne coulissante 10 est relié@ par une transmission appropries a un dispositif de commande,non représenté.A cylinder 5 closed by means of a cylinder head 6 is arranged on the casing 1. The exhaust gases leaving the engine flow in a main passage 7 and auxiliary passages 8 to enter a common pipe d exhaust 9, which was only partially drawn. A cylindrical sliding valve 10 is mounted so as to be able to pivot in the main exhaust passage 7. This sliding valve 10 is connected @ by a suitable transmission to a control device, not shown.

Sur la figure 2,on a reprEsentE en vue dEveloppEs une partie de la chemise du cylindre. Les entrEes du passage principal d'Schappement 7 et des passages auxiliaires 8 sont situées dans La paroi de cylindre. Le bord supérieur 11 du passage principal 7 est situE en dessous des bords sup4- rieurs 12 des passages auxiliaires 8.  In FIG. 2, part of the cylinder liner has been shown in developed view. The entrances to the main exhaust passage 7 and the auxiliary passages 8 are located in the cylinder wall. The upper edge 11 of the main passage 7 is located below the upper edges 12 of the auxiliary passages 8.

La figure 3 est une coupe horizontale du dispositif d'échappement. La ligne de coupe a été représentée en trait mixte sur la figure 2, Le passage principal d'Echappement 7 etablit la liaison entre son entre situee dans la paroi de cylindre et un alesage cylindrique dans lequel est montée à pivotement la vanne coulissante cylindrique 10. Des trous 13 de la vanne coulissante cylindrique 10 sont situes dans la zone ou les passages auxiliaires d'chappement 8 debou- chent dans le passage principal 7. Figure 3 is a horizontal section of the exhaust device. The cutting line has been shown in phantom in FIG. 2, The main passage of Exhaust 7 establishes the connection between its entry located in the cylinder wall and a cylindrical bore in which the cylindrical sliding valve 10 is pivotally mounted. Holes 13 of the cylindrical sliding valve 10 are located in the area where the auxiliary exhaust passages 8 open into the main passage 7.

La vanne coulissante cylindrique 10 recouvre les entres des passages auxiliaires 8 dans le passage principal 7 lorsque le moteur tourne a basse vitesse; ce moment seul le passage principal 7 est en fonction et il en résulte un rgla- ge temporel correspondant du système d'échappement. Aux basses vitesses du moteur,la vanne coulissante cylindrique 10 est déplacée par pivotement de maniare que ses trous 13 déga- gent les passages auxiliaires 8;de cette manière,le moteur fonctionne avec la section total de passage de gaz d'Schappement et avec une large gamme de réglage temporel du système d'échappement,
Bien entendu l'invention n'est pas limitée aux exemples de réalisation ci-dessus décrits et représentés,à partir desquels on pourra prévoir d'autres modems et d'autres formes de réalisation,sans pour cela sortir du cadre de l'invention. The cylindrical sliding valve 10 covers the entrances of the auxiliary passages 8 in the main passage 7 when the engine is running at low speed; at this moment only the main passage 7 is in operation and this results in a corresponding time adjustment of the exhaust system. At low engine speeds, the cylindrical sliding valve 10 is pivotally displaced so that its holes 13 clear the auxiliary passages 8; in this way, the engine operates with the total exhaust gas passage section and with a wide range of time adjustment of the exhaust system,
Of course, the invention is not limited to the embodiments described and shown above, from which other modems and other embodiments can be provided, without thereby departing from the scope of the invention.

Claims (2)

REVENDICATIONS l.Dispositif t'échappement d'un moteur à combustion interne à deux temps,se composant d'un passage principalC7) et i passages auxiliaires(8) d'un dispositif de commande du moment d'ouverture des passages d'echappement et de commande de la section d'écoulement des passages et de la tuyauterie d'echappement,caractrise en ce que des entrees du passage principal (7) et des passages auxiliaires (8)dans la paroi d'un cylindre sont situees l'une à côté de l'autre,en ce que des bords supérieurs des sorties des passages auxiliaires dans le cylindre sont situés au-djssus du bord superieur de l'entrés du passage principal et en ce que lesdits passages auxiliaires et ledit passage principal sont relies entre eux à l'aide d'une vanne coulissante (10), l.Exhaust device of a two-stroke internal combustion engine, consisting of a main passage C7) and i auxiliary passages (8) of a device for controlling the opening time of the exhaust passages and control of the flow section of the passages and of the exhaust piping, characterized in that the entries of the main passage (7) and the auxiliary passages (8) in the wall of a cylinder are located next to each other on the other, in that the upper edges of the outlets of the auxiliary passages in the cylinder are situated above the upper edge of the inlets of the main passage and in that said auxiliary passages and said main passage are interconnected with using a sliding valve (10), 2. Dispositif d'echappement selon la revendication 1, caracterise en ce qu'il est prévu à l'interieur du passage principal d'échappement une vanne coulissante (10) pivotante en forme de cylindre creux qui est reliée par une transmission appropriée , un dispositif de commande, et en ce que des trous ménagés dans la vanne coulissante sont situes 9 l'endroit où les passages auxiliaires débouchent dans le passage principal,  2. Exhaust device according to claim 1, characterized in that there is provided inside the main exhaust passage a sliding valve (10) pivoting in the form of a hollow cylinder which is connected by a suitable transmission, a control device, and in that holes made in the sliding valve are located at the place where the auxiliary passages open into the main passage,
FR8205802A 1981-04-03 1982-04-02 EXHAUST DEVICE OF A TWO-STAGE INTERNAL COMBUSTION ENGINE Granted FR2503258A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS812535A CS225088B1 (en) 1981-04-03 1981-04-03 The exhaust of two-stroke internal combustion engine

Publications (2)

Publication Number Publication Date
FR2503258A1 true FR2503258A1 (en) 1982-10-08
FR2503258B3 FR2503258B3 (en) 1984-02-17

Family

ID=5362756

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8205802A Granted FR2503258A1 (en) 1981-04-03 1982-04-02 EXHAUST DEVICE OF A TWO-STAGE INTERNAL COMBUSTION ENGINE

Country Status (6)

Country Link
JP (1) JPS57210124A (en)
CS (1) CS225088B1 (en)
DE (1) DE3212422A1 (en)
ES (1) ES511102A0 (en)
FR (1) FR2503258A1 (en)
IT (1) IT1150738B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0141650A2 (en) * 1983-11-02 1985-05-15 Kawasaki Jukogyo Kabushiki Kaisha Exhaust port system
EP0165655B1 (en) * 1984-05-23 1990-08-08 Kawasaki Jukogyo Kabushiki Kaisha Exhaust control system for two-cycle engine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2447586A1 (en) * 1974-10-05 1976-04-08 Fichtel & Sachs Ag Two-stroke i/c engine piston exhaust aperture control - has additional outlets in liner, channels issuing into main outlet
JPS555711U (en) * 1978-06-28 1980-01-16

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0141650A2 (en) * 1983-11-02 1985-05-15 Kawasaki Jukogyo Kabushiki Kaisha Exhaust port system
EP0141650A3 (en) * 1983-11-02 1987-01-28 Kawasaki Jukogyo Kabushiki Kaisha Exhaust port system
EP0165655B1 (en) * 1984-05-23 1990-08-08 Kawasaki Jukogyo Kabushiki Kaisha Exhaust control system for two-cycle engine

Also Published As

Publication number Publication date
IT1150738B (en) 1986-12-17
IT8220504A0 (en) 1982-03-31
CS225088B1 (en) 1984-02-13
JPS57210124A (en) 1982-12-23
JPS6212371B2 (en) 1987-03-18
FR2503258B3 (en) 1984-02-17
ES8304263A1 (en) 1983-02-16
DE3212422A1 (en) 1982-11-11
ES511102A0 (en) 1983-02-16

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