WO2008029875A1 - Isolateur - Google Patents

Isolateur Download PDF

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Publication number
WO2008029875A1
WO2008029875A1 PCT/JP2007/067394 JP2007067394W WO2008029875A1 WO 2008029875 A1 WO2008029875 A1 WO 2008029875A1 JP 2007067394 W JP2007067394 W JP 2007067394W WO 2008029875 A1 WO2008029875 A1 WO 2008029875A1
Authority
WO
WIPO (PCT)
Prior art keywords
insulator
passage
housing
acceleration pump
pump
Prior art date
Application number
PCT/JP2007/067394
Other languages
English (en)
Japanese (ja)
Inventor
Ryou Ono
Original Assignee
Husqvarna Zenoah Co., Ltd.
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 Zenoah Co., Ltd. filed Critical Husqvarna Zenoah Co., Ltd.
Priority to US12/440,360 priority Critical patent/US20100193166A1/en
Publication of WO2008029875A1 publication Critical patent/WO2008029875A1/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
    • F02M7/00—Carburettors with means for influencing, e.g. enriching or keeping constant, fuel/air ratio of charge under varying conditions
    • F02M7/06—Means for enriching charge on sudden air throttle opening, i.e. at acceleration, e.g. storage means in passage way system
    • F02M7/08—Means for enriching charge on sudden air throttle opening, i.e. at acceleration, e.g. storage means in passage way system using pumps
    • 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
    • F02M15/00—Carburettors with heating, cooling or thermal insulating means for combustion-air, fuel, or fuel-air mixture
    • F02M15/06—Heat shieldings, e.g. from engine radiations
    • 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
    • F02M17/34—Other carburettors combined or associated with other apparatus, e.g. air filters

Definitions

  • the present invention relates to an engine insulator, and more particularly to an insulator used in a stratified scavenging two-cycle engine.
  • an exhaust port and a scavenging port are opened and closed by a piston.
  • the exhaust port is opened by lowering the piston, the combustion gas is discharged as exhaust gas, and the air-fuel mixture in the crank chamber flows into the cylinder through the scavenging passage from the scavenging port that is opened almost simultaneously.
  • the air-fuel mixture that has flowed in will flow out, albeit slightly, while the combustion gas remaining in the cylinder is scavenged before the piston closes the exhaust port.
  • the stratified scavenging two-cycle engine has a leading air passage communicating with the scavenging passage.
  • the leading air can be sucked into the upper side of the scavenging passage, and at the time of scavenging, the leading air scavenges the combustion gas in the cylinder first, so that the mixture does not easily flow out. Therefore, fuel efficiency is improved and a complicated muffler structure is not required.
  • Patent Document 1 As a countermeasure technique, it has been proposed to install an acceleration device that temporarily increases the amount of fuel during acceleration (for example, Patent Document 1).
  • the acceleration device of Patent Document 1 is provided between a carburetor and a carburetor and an engine.
  • the structure includes an insulator that suppresses heat transfer from the engine and an acceleration pump connected to the carburetor, and the insulator leading air passage and the acceleration pump are connected by piping.
  • Patent Document 1 Japanese Patent Laid-Open No. 2001-123841
  • a main object of the present invention is to provide an insulator capable of simplifying the communication structure and realizing space saving around the engine.
  • An insulator according to the present invention is provided between an engine and a carburetor, and has a heat insulating portion having an insulator leading air passage and an insulator mixed air passage, and is integrally formed with the heat insulating portion, and is an accelerator pump. And a housing portion constituting a part of the housing.
  • the housing part force formed integrally with the heat insulating part constitutes a part of the housing of the acceleration pump, so that the acceleration pump is arranged around the insulator, which was a dead space in the past.
  • the acceleration pump is arranged directly around the heat insulating part, even when piping is used to connect the insulator leading air passage and the acceleration pump, the length of the piping can be shortened, and the communication structure can be simplified. it can.
  • the housing part is formed integrally with the heat insulating part, the number of parts can be reduced, the cost can be reduced, and the acceleration pump can be easily assembled.
  • Fig. 1 is a sectional view showing a structure around an insulator according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view of the insulator viewed from the carburetor side.
  • FIG. 1 is a cross-sectional view showing a structure around an insulator 2 according to the present embodiment
  • FIG. 2 is a cross-sectional view of the insulator 2 as viewed from the side of the carburetor 3
  • FIG. 3 is an exploded perspective view of the acceleration pump 6.
  • a carburetor 3 is attached to such an engine 1 via an insulator 2!
  • the carburetor 3 is provided with a leading air passage 31 on the upper side, a lower gas mixture passage 32 on the lower side, and a constant pressure fuel supply mechanism 4 for supplying fuel to the lower gas mixture passage 32 at the bottom.
  • the constant pressure fuel supply mechanism 4 includes a constant pressure chamber 41 defined on the lower side across the diaphragm 40, a constant pressure fuel chamber 42 defined on the upper side, and a fuel tank and a constant pressure fuel chamber 42 (not shown) communicating with each other. It includes a flow path 43 and a fuel pump 44 provided in the middle of the internal flow path 43.
  • the carburetor constant pressure chamber 41 communicates with the atmosphere through the communication passage 410.
  • the constant pressure fuel chamber 42 includes a needle valve 421 that opens and closes a communication hole 420 that allows the internal flow path 43 and the constant pressure fuel chamber 42 to communicate with each other, and supplies fuel from the fuel supply path 422 to the cap mixture path 32.
  • the fuel pump 44 reduces the diaphragm 45 by the pulsation pressure of the crankcase transmitted from the engine 1. Move up and down. That is, when fuel is supplied from the constant pressure fuel chamber 42 through the fuel supply passage 422 to the cap mixture passage 32, the communication hole 420 is opened by the needle valve 421, and the fuel pump 44 moves the diaphragm 45 up and down to move the fuel. Is sucked out of the fuel tank and supplied to the constant pressure fuel chamber 42.
  • the insulator 2 is a synthetic resin member that suppresses heat transfer from the engine 1 to the carburetor 3, and is integrally formed with the heat insulating part 20 for heat transfer suppression and the heat insulating part 20 below the heat insulating part 20. And a housing portion 5 formed more!
  • the heat insulating section 20 includes an insulator leading air passage 21 that allows the engine leading air passage 11 and the cap leading air passage 31 to communicate with each other, and an insulator air-fuel mixture that causes the engine mixture passage 12 and the cap mixture passage 32 to communicate with each other. Equipped with passage 22! As shown in FIG. 2, a pulsation transmission passage 23 is provided below the insulator mixture passage 22. One end of the pulsation transmission passage 23 communicates with the crank chamber of the engine 1 and the other end communicates with the fuel pump 44 of the carburetor 3 to transmit the pulsation pressure in the crank chamber to the fuel pump 44.
  • the heat insulation portion 20 is provided with a first passage 24 extending from the insulator leading air passage 21 to the side (right side in FIG. 2).
  • the first passage 24 communicates with a pipe 71 composed of a pipe 25 attached to the heat insulating part 20, a pipe 52 attached to the housing part 5, and a tube 70 connecting the pipes 25 and 52! /
  • first connecting holes 26 A to 26 D are formed in the corners of the heat insulating portion 20.
  • Nuts 27 are embedded between the connection holes 26A and 26B and between the connection holes 26C and 26D.
  • Second connecting holes 28A and 28B are formed at positions corresponding to the nuts 27.
  • the insulator 2 is attached to the engine 1 by screwing a screw (not shown) inserted into the first connection holes 26A to 26D into a screw hole on the engine 1 side.
  • the carburetor 3 is attached to the insulator 2 by screwing a screw passing through the carburetor 3 and the second connecting holes 28A and 28B into the nut 27.
  • the acceleration pump 6 includes the above-described housing part 5 formed in a funnel shape, a diaphragm 60 supported by a support part 50 formed in a bowl shape on the inner peripheral surface of the housing part 5, and the housing part 5
  • a spring 61 fitted between the housing part 5 and the diaphragm 60 by being fitted to a spring guide part 51 projecting from the bottom, and fitted into the housing part 5 and sandwiching the packing 62
  • the support portion 50 and the lid 63 that sandwiches the diaphragm 60 are included.
  • the housing 64 of the acceleration pump 6 is constituted by the housing portion 5 and the lid 63. Further, as shown in FIG. 1, a negative pressure chamber 65 is formed by the space inside the housing 64 that is partitioned by the diaphragm 60 and accommodates the spring 61, and the lid 6
  • a pump chamber 66 is formed by the space on the three sides.
  • a second passage 54 (see FIG. 2) communicating with the pipe 71 is provided in the base 53 of the winging portion 5.
  • the first passage 24, the second passage 54, and the pipe 71 form a pressure introduction passage 7, and the negative pressure in the insulator leading air passage 21 is transmitted to the negative pressure chamber 65 through the pressure introduction passage 7.
  • the lid 63 is provided with a ridge inlet 67. At the entrance 67, a projection 46 protruding from the carburetor 3 is inserted.
  • the pump chamber 66 is connected to a communication passage 68 formed at the back of the dredge 67.
  • the housing portion 5 forms a part of the housing 64 of the acceleration pump 6, so that the space between the engine 1 and the carburetor 3 is below the heat insulating portion 20.
  • the accelerating pump 6 is disposed in this space, and this space has conventionally been a dead space where nothing is disposed. For this reason, in the present embodiment, it can be said that the acceleration pump 6 is provided by effectively using such a dead space, and space saving can be realized.
  • the housing part 5 is formed integrally with the heat insulating part 20, the number of parts can be reduced, the cost can be reduced, and the assembly can be facilitated. Furthermore, since the acceleration pump 6 is disposed directly below the heat insulating portion 20, the length of the pipe 71 that communicates the insulator leading air passage 21 and the negative pressure chamber 65 in the acceleration pump 6 can be shortened. The communication structure can be simplified.
  • a partition wall forming member is provided inside the housing, and a guide portion for guiding a spring is provided in the partition wall forming member.
  • the spring guide portion 51 for guiding the spring 61 is provided integrally with the housing portion 5 so that the partition wall forming member is not required, the number of parts can be further reduced, Accelerate by reducing the space in the housing 64 by the amount that does not require a partition forming member.
  • the pump 6 can be downsized, and further space saving can be promoted.
  • the head air passage 31 is closed in conjunction with the throttle valve in the air-fuel mixture passage 32, so that the inside of the front air passages 11, 21, 31 is negative due to the intake operation on the engine 1 side. Pressure. For this reason, negative pressure is introduced from the insulator leading air passage 21 to the negative pressure chamber 65 through the pressure introduction passage 7, and the diaphragm 60 is pulled to the negative pressure chamber 65 side by being piled on the spring force of the spring 61. .
  • the throttle valve opens, and the insulator leading air passage 21 is also opened in conjunction with this, and the negative pressure disappears all at once.
  • the diaphragm 60 is instantaneously returned to the pump chamber 66 side by the spring force of the spring 59, and the air in the pump chamber 66 is pumped to the constant pressure chamber 41 through the communication passages 68 and 460. Therefore, the diaphragm 40 that partitions the constant pressure fuel chamber 42 and the carburetor constant pressure chamber 41 is pushed up, and the fuel in the constant pressure fuel chamber 42 is pressurized, so the amount of fuel supplied to the cap mixture passage 32 increases. To do. Therefore, during sudden acceleration, the fuel supply amount is temporarily increased by the acceleration pump 6, so that the engine 1 can be smoothly accelerated even during sudden acceleration.
  • the inner diameter of the communication path 410 that connects the carburetor constant pressure chamber 41 and the atmosphere is smaller than the inner diameter of the communication paths 68 and 460 from the acceleration pump 6 side. It is possible to reliably push up the diaphragm 40 on the constant pressure chamber 41.
  • the pressure introduction passage 7 that connects the insulator leading air passage 21 and the negative pressure chamber 65 is provided on the connection surface with the engine 1 of the heat insulating portion 20 that does not necessarily include the pipe 71.
  • the piping 71 provided outside can be eliminated, the communication structure can be simplified, and space saving can be promoted.
  • the pressure introduction passage 7 may include a groove provided on a connection surface of the heat insulating portion 20 with the carburetor 3.
  • the spring guide portion 51 is integrally formed in the housing 64.
  • the partition forming member shown in Patent Document 1 described in the background art is provided in the housing 64.
  • one end of the spring 61 may be supported by providing the partition wall forming member with the spring guide portion 51.
  • the present invention can be used for portable work machines such as a blower and a brush cutter as an insulator integrated with an acceleration pump provided between a stratified scavenging two-cycle engine and a carburetor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
  • Compressor (AREA)

Abstract

La présente invention concerne un isolateur (2) dans lequel un boîtier (5) est moulé intégralement avec une section d'isolation thermique (20) dans sa partie inférieure, où le boîtier (5) forme une partie d'un boîtier (64) d'une pompe de reprise (6). La construction permet à la pompe de reprise (6) d'être placée dans la partie directement autour de l'isolateur (2) qui est habituellement un espace mort, éliminant la nécessité d'un espace dédié pour installer la pompe de reprise afin de réaliser une économie d'espace. En outre, parce que la pompe de reprise (6) se trouve dans une partie autour de la section d'isolation thermique (20), même si un tuyau est utilisé pour interconnecter un passage d'air vers l'avant (21) dans l'isolateur et la pompe de reprise (6), la longueur de la tuyauterie peut être réduite pour simplifier la structure de l'interconnexion. En outre, vu que le boîtier (5) est formé intégralement avec la section d'isolation thermique (20), le nombre de pièces peut être réduit afin de réduire les coûts et faciliter l'assemblage de la pompe de reprise (6).
PCT/JP2007/067394 2006-09-06 2007-09-06 Isolateur WO2008029875A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/440,360 US20100193166A1 (en) 2006-09-06 2007-09-06 Insulator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006241099A JP2008063983A (ja) 2006-09-06 2006-09-06 インシュレータ
JP2006-241099 2006-09-06

Publications (1)

Publication Number Publication Date
WO2008029875A1 true WO2008029875A1 (fr) 2008-03-13

Family

ID=39157300

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2007/067394 WO2008029875A1 (fr) 2006-09-06 2007-09-06 Isolateur

Country Status (4)

Country Link
US (1) US20100193166A1 (fr)
JP (1) JP2008063983A (fr)
CN (1) CN101512138A (fr)
WO (1) WO2008029875A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009119429A1 (fr) * 2008-03-25 2009-10-01 本田技研工業株式会社 Dispositif de distribution de carburant pour moteur

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5118528B2 (ja) * 2008-03-25 2013-01-16 本田技研工業株式会社 エンジンの燃料供給装置
JP5118527B2 (ja) * 2008-03-25 2013-01-16 本田技研工業株式会社 エンジンの燃料供給装置
FR2986769B1 (fr) * 2012-02-10 2014-01-24 Peugeot Citroen Automobiles Sa Bouclier thermique muni d'une patte d'appui contre un composant.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5922976U (ja) * 1982-07-31 1984-02-13 株式会社京浜精機製作所 燃料ポンプ
JP2001123841A (ja) * 1999-10-21 2001-05-08 Nippon Walbro:Kk ２行程機関の加速装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5922976U (ja) * 1982-07-31 1984-02-13 株式会社京浜精機製作所 燃料ポンプ
JP2001123841A (ja) * 1999-10-21 2001-05-08 Nippon Walbro:Kk ２行程機関の加速装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009119429A1 (fr) * 2008-03-25 2009-10-01 本田技研工業株式会社 Dispositif de distribution de carburant pour moteur
US8366080B2 (en) 2008-03-25 2013-02-05 Honda Motor Co., Ltd. Fuel supply device for engine

Also Published As

Publication number Publication date
CN101512138A (zh) 2009-08-19
JP2008063983A (ja) 2008-03-21
US20100193166A1 (en) 2010-08-05

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