WO2008111880A1 - Carburateur de moteur deux temps - Google Patents

Carburateur de moteur deux temps Download PDF

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Publication number
WO2008111880A1
WO2008111880A1 PCT/SE2007/000226 SE2007000226W WO2008111880A1 WO 2008111880 A1 WO2008111880 A1 WO 2008111880A1 SE 2007000226 W SE2007000226 W SE 2007000226W WO 2008111880 A1 WO2008111880 A1 WO 2008111880A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
valve
scavenging air
scavenging
carburettor
Prior art date
Application number
PCT/SE2007/000226
Other languages
English (en)
Inventor
Gustaf DÖRAGRIP
Pär MARTINSSON
Original Assignee
Husqvarna Aktiebolag
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 Husqvarna Aktiebolag filed Critical Husqvarna Aktiebolag
Priority to PCT/SE2007/000226 priority Critical patent/WO2008111880A1/fr
Publication of WO2008111880A1 publication Critical patent/WO2008111880A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M23/00—Apparatus for adding secondary air to fuel-air mixture
    • F02M23/02—Apparatus for adding secondary air to fuel-air mixture with personal control, or with secondary-air valve controlled by main combustion-air throttle
    • F02M23/03—Apparatus for adding secondary air to fuel-air mixture with personal control, or with secondary-air valve controlled by main combustion-air throttle the secondary air-valve controlled by main combustion-air throttle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M17/00—Carburettors having pertinent characteristics not provided for in, or of interest apart from, the apparatus of preceding main groups F02M1/00 - F02M15/00
    • F02M17/02—Floatless carburettors
    • F02M17/04—Floatless carburettors having fuel inlet valve controlled by diaphragm
    • 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
    • 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
    • F02B25/20—Means for reducing the mixing of charge and combustion residues or for preventing escape of fresh charge through outlet ports not provided for in, or of interest apart from, subgroups F02B25/02 - F02B25/18
    • F02B25/22—Means for reducing the mixing of charge and combustion residues or for preventing escape of fresh charge through outlet ports not provided for in, or of interest apart from, subgroups F02B25/02 - F02B25/18 by forming air cushion between charge and combustion residues
    • 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

Definitions

  • the invention is related to diaphragm carburettors for two-stroke internal combustion engine using scavenging air.
  • Two-stroke internal combustion engines having scavenging air system have typically been designed with special flow ducts through which fresh air is introduced into the combustion chamber ahead of the air-fuel mixture.
  • a scavenging procedure at the end of the engine power stroke, when the port of the exhaust duct is opened, fresh air is supplied behind the exhaust gases and before the fuel/air mixture.
  • This supply of additional air to the combustion chamber is also called scavenging air.
  • scavenging air helps evacuating the exhaust gases as well as keeping the air-fuel mixture in the combustion engine. This provides a reduction of the fuel consumption and the achievement of cleaner exhaust gases.
  • JP 09268917 A shows a carburettor design utilizing scavenging air.
  • Disposed between the air filter and the carburettor housing is an intermediate piece that extends the intake channel portion and from which branches a connecting line that opens into the transfer port between crank case and combustion chamber of the connected two-cycle engine.
  • an intermediate component between the air filter and the carburettor for branching off the air for combustion by itself increases the overall length, which is undesirable since space conditions are limited.
  • the installation space provided for accommodating the carburettor and the air filter is very limited, for which reason the conversion of the layered scavenging is particularly problematic for such applications.
  • US6328288 shows a diaphragm carburettor for a two-stroke internal combustion engine having a scavenging air component mounted on top of the carburettor reducing the overall length.
  • the bottom of the scavenging air component acts as the cover for the pump housing of the diaphragm carburettor, reducing the overall height, that is still however fairly big.
  • WO2004005692 shows a connective adapter utilized to accommodate the incorporation of a scavenging air supply to a two-stroke internal combustion engine.
  • the adapter takes the form of a thin-body flange that is connected to an air-filter side of an engine, which gives a big total height.
  • FIG. 3 in US6928996 shows a scavenging air supply body carried by the carburettor, which has two circular shaped scavenging air passages arranged side by side. This reduces the overall height but since each air passage has a separate air control valve costs are increased. Further problems with tolerances may occur.
  • One object of the invention is to provide a carburettor for a two-stroke internal combustion engine that operates with scavenging air which overall height and length is minimised.
  • a further object is to provide a scavenging air component, which can be easily mounted to the main body of a carburettor.
  • a carburettor for a two-stroke internal combustion engine that operates with scavenging air, comprising: a) a carburettor main body including a main air passage having at least a throttle valve mounted therein, the main air passage extends from an air intake side of the main body to an opposite air outtake side of the main body, the main body further including a fuel pump side comprising a fuel pump and an opposite diaphragm side comprising a diaphragm, both being transversal to the intake and outtake sides, b) a scavenging air component mounted on the fuel pump side or the diaphragm side, which scavenging air component includes a scavenging air passage having a scavenging air valve of butterfly type mounted therein, the scavenging air passage extends substantially parallel to the main air passage from an air inlet towards at least one air outlet, the air inlet and the air intake side of the main body forming an air filter facing
  • the oblong air inlet 4 is preferably rectangular having rounded corners, but may have any shape ranging from oval to rectangular.
  • Such a carburettor provides the benefit of a reduced overall all height, while maintaining a sufficient scavenging air flow.
  • the scavenging air valve is spring loaded, biasing the scavenging air valve towards a closed position and the width of air inlet is at least 1,5 times longer than the height of air inlet, preferably twice as long.
  • the scavenging air component can be mounted on the fuel pump side or on the diaphragm side preferably acting as a cover for the fuel pump or the diaphragm.
  • the scavenging air passage includes a first portion having a oblong cross section, which first section extends from the air inlet towards the air outlet and a second portion extending from the first portion to the air outlet.
  • the second portion is divided into two apertures whereby the at least one air outlet being two.
  • a first valve shaft is rotatably mounted in the first portion and a oblong valve plate is centrally secured to the first valve shaft, which oblong valve plate is adapted in its shape to seal against the inner walls of the first portion when the scavenging air valve is in a closed position.
  • the height of the oblong valve plate is preferably somewhat larger than the height of the first portion so that the oblong valve plate will be somewhat tilted when in the closed position forming an angle ⁇ l to the bottom and top of the scavenging air passage.
  • the angle ⁇ l is preferably less than 90° and larger than 70°.
  • the oblong valve plate has grooves along at least the width part of the margin of the oblong valve plate, which valve plate is preferably made of a rigid polymer material e.g. a thermo plastic such as POM.
  • the mouths of the grooves are preferably arranged to point in the same direction as a rotational closing direction of the scavenging air valve.
  • the scavenging air component comprises a circular valve seat, which valve seat's plane is tilted at an angle ⁇ in relation to the plane of the main body side on which the scavenging air component is mounted, the angle ⁇ being less than 45° and larger than 10°, preferably less than 35° and preferably larger than 15°.
  • the valve seat separating an air outtake portion of the scavenging air passage connected to the air outlets and an air intake portion of the scavenging air passage connected to the air inlet.
  • the scavenging air valve of the second embodiment includes a second valve shaft rotatably mounted in the scavenging air component and a circular valve plate centrally secured to the second valve shaft.
  • the circular valve plate has a diameter which is larger than that of the circular valve seat thereby forming an angle ⁇ 2 to the circular valve seat at the two opposite positions of the margin of the circular valve plate being farthest away from the second valve shaft, when the valve is closed.
  • the angle ⁇ 2 is less than 90° and larger than 70°.
  • the circular valve plate has a chamfered margin adapted as to seal against the circular valve seat.
  • the scavenging air component of the second embodiment consists of a two body parts; 1) a first body part including the valve seat and having the second valve shaft with the centrally mounted circular valve plate rotatably mounted therein, and 2) a second body part forming the air intake portion together with the first body part.
  • the first body part also includes the air outtake portion.
  • FIG. 1 shows a perspective view of the carburettor according to a preferred embodiment of the invention
  • FIG. 2 shows the side of the carburettor of the preferred embodiment of the invention facing the air filter
  • FIG. 3 shows the side of the carburettor of the preferred embodiment of the invention facing the engine
  • FIG. 4 shows a cross sectional view of the scavenging air component taken along the line
  • FIG. 5 shows a cross sectional view of the carburettor taken along the line V-V in FIG. 2,
  • FIG. 5a is a zooming of the dotted circle in FIG. 5,
  • FIG. 5b shows the arrangement of valve plate grooves according to conventional valves
  • FIG. 6 shows an exploded view of the carburettor according to a second embodiment of the invention
  • FIG. 7 shows a perspective view of the carburettor of the second embodiment, where the cover, the valve shaft, and the valve plate of the scavenging sir component have been removed
  • FIG. 8 shows the a perspective view of the scavenging air component according to the second embodiment
  • FIG. 9 shows a cross sectional view of the carburettor according to the second embodiment.
  • the invention concerns a carburettor 1 of a two-stroke internal combustion engine that operates with scavenging air.
  • the internal combustion engine is a two-cycle engine that operates with layered scavenging and is preferably used in manually guided implements.
  • Such manually guided, portable implements can be embodied as power chainsaws, cut-off machines, brush cutters, blowers or the like.
  • FIG. 1-5B shows the preferred embodiment of the present invention and FIG. 6-9 shows a second embodiment of the invention.
  • parts that are identical or close to identical have been given the same numerals.
  • the carburettor 1 is shown comprising a carburettor main body 2 including a main air passage 9 extending from an air intake side of the main body to an opposite air outtake side (se FIG. 3) of the main body.
  • the carburettor 1 is mounted in e.g. a chainsaw the air intake side faces the air filter and the air outtake side faces the engine.
  • a choke valve 11 is mounted in the main air passage 9 near the air intake side and a throttle valve 16 (see FIG. 3 and FIG. 5) is mounted near the air outtake side.
  • a fuel pump is located at a fuel pump side 50 of the main body 2 and a diaphragm is located at the opposite side, which is referred to as the diaphragm side 51.
  • a scavenging air component 3 is mounted on the fuel pump side 50 of the main body 2.
  • the top side of the scavenging air component 3 could very well face the bottom of the chainsaw as well as any other direction.
  • the scavenging air component 3 is secured to the main body 2 by a centrally placed screw 15 and two aligning pins (not shown but the same as for the second embodiment, seen in FIG. 6).
  • the bottom side of scavenging air component 3 acts as a cover for the fuel pump in order to reduce the overall height of the carburettor 1.
  • the scavenging air component 3 includes a scavenging air passage 2OA, 2OB having a scavenging air valve 6, 7 of butterfly type mounted therein.
  • the scavenging air passage 2OA, 20B extends substantially parallel to the main air passage 9, from its air inlet 4 towards its two air outlets 5A, 5B.
  • the air inlet 4 and the air intake side of the main body 2 forms a common side, which we refer to as the air filter facing side of the carburettor.
  • the shape of the air inlet 4 is rectangular oval, i.e. rectangular shaped but with rounded corners, and having an opening width wl and an opening height hi (see FIG. 4 and FIG. 5).
  • the air inlet 4 could preferably have any oblong shape in the range from oval to rectangular.
  • the width wl of the air inlet 4 is longer than the height hi thereof, preferably at least 1,5 times as long and even more preferred at least twice as long. The reason for this is to reduce the overall height of the carburettor while maintaining a sufficient air flow through the scavenging air component 3.
  • the scavenging air passage 2OA, 2OB comprises a first portion having a first length Ll and a rectangular cross section having close to or the same height and width as those of the air inlet 4.
  • the first section extends from the air inlet 4 towards a second portion, which follows the first portion.
  • the second portion is split in two apertures which end at the two air outlets 5A, 5B, receptively.
  • the second portion has a second length L2.
  • a scavenging air valve is mounted in the first portion.
  • the scavenging air valve includes a first valve shaft 6 rotatably mounted in the first portion at the shaft bearings labelled 33.
  • a rectangular valve plate 7 is centrally secured to the first valve shaft 6.
  • the rectangular valve plate is adapted in its shape to seal against the inner walls of the first portion when the scavenging air valve is in a closed position, as seen in e.g. FIG. 5.
  • the height h2 of the rectangular valve plate 7 is somewhat larger than the height hi of the first portion so that the rectangular valve plate 7 will be somewhat tilted when in its closed position.
  • the rectangular valve plate 7 forms an angle ⁇ l to the bottom of the scavenging air passage 2OA, 2OB, which angle ⁇ l is less than 90° and larger than 70°.
  • the reason for this is to create a natural stop for the valve plate 7, i.e. a valve seat.
  • the rectangular valve plate 7 further comprises grooves 21, 22, as seen in FIG. 5 A and FTG 2, around at least the width part of its margin.
  • These grooves 21, 22 provides for the margin of the valve plate 7 to flex somewhat when the valve closes, thereby enhancing the sealing efficiency against the inner walls of the first portion.
  • these grooves are mainly suitable when the valve plate 7 is made of a material which is not too stiff, and it is therefore preferred that the rectangular valve plate 7 is made in a rigid polymer material e.g. a thermo plastic such as POM.
  • Conventionally such grooves has been arranged as shown in FIG. 5B, i.e. having the mouths of the grooves (21', 22') pointing in the same direction as the rotational opening direction of the scavenging air valve.
  • An inventive feature of the present invention is therefore to arranging the mouths of the grooves 21, 22 in an opposite manner, i.e. having the groove openings of the grooves (21, 22) pointing in the same direction as the rotational closing direction of the scavenging air valve. It has been discovered that the sealing efficiency is maintained, in particular when the valve is spring loaded, while the wedging problems have been minimised.
  • the scavenging air valve is spring loaded, biasing the scavenging air valve towards a closed position.
  • this spring has been omitted, however, it is the same as the spring labelled 30 in the second embodiment.
  • a throttle valve lever 13 controls the throttle valve 16 and a coupling rod 12 connects the throttle valve 16 with the scavenging air valve 6, 7, so that when the throttle lever 13 is actuated, the throttle valve 16 and the scavenging air valve 6, 7 will both be affected.
  • the turning of the scavenging air valve takes place in synchronism with the turning of the throttle valve 16 via a coupling rod 12. They are so arranged that when the throttle valve 16 is in the idling position, the scavenging air valve is completely closed. Then, when the engine speed is increasing as the throttle's movement rotates the valve shaft of the throttle valve, the scavenging air valve will first be opened slowly, thereafter proportionally more rapidly.
  • FIG. 6-9 a second embodiment of the present invention is shown.
  • the carburettor main body 2 is the same as in FIG. 1-5.
  • FIG. 6 shows an exploded view of the carburettor 1.
  • the scavenging air component 3 A, 3B acts a cover for the fuel pump side 51 and is secured to the main body 2 by a single centrally placed screw 40 in cooperation with the alignment pins 37, which are adapted to fit in the corresponding holes 38 of the main body 2.
  • the scavenging air component according to the second embodiment consists of a two body parts; 1) a first body part 3A which includes a circular valve seat 35, 36, an air outtake portion 2OB of the scavenging air passage 2OA, 2OB, below the valve seat 35, 36 and two air outlets 5A, 5B, and 2) a second body part 3B forming an air intake portion 2OA of the scavenging air passage together with the first part 3A which has an rectangular oval shaped air inlet 4.
  • a scavenging air passage 20A, 2OB is hence formed by the intake portion 2OA and the outtake portion 2OB.
  • the circular valve seat 35, 36 is tilted at an angle ⁇ in relation to the plane of the fuel pump side.
  • the angle ⁇ is less than 45° and larger than 10°, preferably less than 35° and preferably larger than 15°.
  • the circular valve seat 35, 36 separates the air outtake portion 2OB of the scavenging air passage 2OA, 2OB connected to the air outlets 5A, 5B from the air intake portion 2OA connected to the air inlet 4.
  • the diameter of the circular valve seat 35, 36 is indicated by dl in FIG.9.
  • the valve seat 35, 36 consists of two flange portions, a first flange portion 35 and a second flange portion 36, each forming a half circle separated from each other by two opposite located bearings 33 in which a valve shaft 6 is rotatably secured. Hence, the valve shaft 6 divides the valve seat area in two equal semi circles.
  • a circular valve plate 7' is centrally secured to the valve shaft 6 separating the outtake portion 20 B and the intake portion 2OA of the scavenging air passage 2OA, 2OB when the valve is closed.
  • the fully open position of the valve is indicated by the dotted lined circular valve plate 7' and the closed position by the full lined circular valve plate T .
  • the circular valve plate 7' has a circular valve plate diameter d2 which is larger than the circular valve seat diameter dland when the scavenging air valve is closed the circular valve plate T forms an angle ⁇ 2 to the valve seat 35, 36, at the two opposite positions of margin 45 of the circular valve plate T being farthest away from the valve shaft 6.
  • the angle ⁇ 2 is less than 90° and larger than 70°.
  • the margin 45 of the circular valve plate T is chamfered so as to mate the valve seat 35, 36 when the valve is closed.
  • the slope of the chamfered margin 45 will vary around the circular valve plate T in order to mate the valve seat 35, 36, from a slight inclination the two opposite positions of margin 45 being farthest away from the valve shaft 6 corresponding to the angle ⁇ 2 towards a right angled margin 45 at the bearings 33.
  • valve seat flange portions 35, 36 have their lateral extensions at least as long as the chamfered margin 45 of the circular valve plate 7'. Due to manufacturing conditions the second flange portion 36 has a longer lateral extension than the first flange portion 35.
  • the scavenging air component 3 has been shown as mounted as a cover for the fuel pump, it would of course be possible to have a separated cover for the fuel pump and the scavenging component mounted on top of that cover.
  • the scavenging air component 3 mounted on the opposite side of the main body 2, i.e. the side having the diaphragm.
  • the scavenging air component 3 could then be mounted as a cover for the diaphragm, but also here it would be possible to have a separate cover for the diaphragm upon which the scavenging air component 3 is mounted.
  • valve plates 7, 7' of the first and second embodiments could be e.g. be made of metallic materials such as e.g. brass, aluminium or a rigid polymer material e.g. a thermo plastic such as POM.
  • metallic materials such as e.g. brass, aluminium or a rigid polymer material e.g. a thermo plastic such as POM.
  • the valve plate is made of a rigid polymer material, preferably a thermo plastic, even more preferred POM, since in this embodiment it desired to have a valve plate with flexible margins, which is enabled by having a valve plate made of a rigid polymer material having grooves around at least a portion of the margin.
  • the valve plate is made of metallic material such as brass or aluminium, since a valve plate made of such materials can be manufactured with lower tolerances (for the first embodiment the tolerances could be higher due to compensation of the flexible margin).
  • the body of the scavenging air component is preferably made of a metallic material such as e.g. brass or aluminium or a rigid polymer material.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

L'invention porte sur un carburateur (1) de moteur à combustion interne à deux temps à air de balayage comportant: a) un corps principal (2) présentant le passage d'air principal (9) muni d'au moins un papillon des gaz (16), le passage (9) s'étendant entre la prise d'air du corps principal et la sortie d'air du côté opposé; b) un composant de balayage d'air (3; 3 A, 3B) placé à côté de la pompe d'alimentation (50) ou à côté du diaphragme (51) du corps principal (2), et comportant un passage d'air de balayage (2OA, 20B), muni d'une soupape papillon (6, 7; 6, 7'), et sensiblement parallèle au passage d'air principal (9) et s'étendant entre une entrée d'air oblongue (4) et sa ou ses sorties d'air (5A, 5B); et c) un coupleur (12) reliant le papillon des gaz (16) à la soupape d'air de balayage (6, 7; 6, T).
PCT/SE2007/000226 2007-03-09 2007-03-09 Carburateur de moteur deux temps WO2008111880A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/SE2007/000226 WO2008111880A1 (fr) 2007-03-09 2007-03-09 Carburateur de moteur deux temps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2007/000226 WO2008111880A1 (fr) 2007-03-09 2007-03-09 Carburateur de moteur deux temps

Publications (1)

Publication Number Publication Date
WO2008111880A1 true WO2008111880A1 (fr) 2008-09-18

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014111142A1 (fr) 2013-01-16 2014-07-24 Husqvarna Ab Soupape combinée de décompression et d'amorçage pour moteur à combustion interne et moteur équipé de la soupape
US20150069641A1 (en) * 2013-09-11 2015-03-12 Walbro Engine Management, Llc. Carburetor for air scavenged engine
CN113217230A (zh) * 2021-04-13 2021-08-06 速能环保科技河北有限公司 摩托车环保节油装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004005692A1 (fr) * 2002-07-02 2004-01-15 Aktiebolaget Electrolux Soupape pour la regulation de l'air d'appoint pour moteur a deux temps
US6928996B2 (en) * 2002-07-03 2005-08-16 Walbro Japan, Inc. Stratified scavenging mechanism of a two-stroke engine
EP1712759A2 (fr) * 2000-01-14 2006-10-18 Husqvarna Aktiebolag Un dispositif de bride pour l'alimentation d'air supplémentaire à un moteur à deux temps

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1712759A2 (fr) * 2000-01-14 2006-10-18 Husqvarna Aktiebolag Un dispositif de bride pour l'alimentation d'air supplémentaire à un moteur à deux temps
WO2004005692A1 (fr) * 2002-07-02 2004-01-15 Aktiebolaget Electrolux Soupape pour la regulation de l'air d'appoint pour moteur a deux temps
US6928996B2 (en) * 2002-07-03 2005-08-16 Walbro Japan, Inc. Stratified scavenging mechanism of a two-stroke engine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014111142A1 (fr) 2013-01-16 2014-07-24 Husqvarna Ab Soupape combinée de décompression et d'amorçage pour moteur à combustion interne et moteur équipé de la soupape
US20150069641A1 (en) * 2013-09-11 2015-03-12 Walbro Engine Management, Llc. Carburetor for air scavenged engine
CN113217230A (zh) * 2021-04-13 2021-08-06 速能环保科技河北有限公司 摩托车环保节油装置
CN113217230B (zh) * 2021-04-13 2022-04-26 速能环保科技河北有限公司 摩托车环保节油装置

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