CN101512138A - Insulator - Google Patents

Insulator Download PDF

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Publication number
CN101512138A
CN101512138A CNA2007800330921A CN200780033092A CN101512138A CN 101512138 A CN101512138 A CN 101512138A CN A2007800330921 A CNA2007800330921 A CN A2007800330921A CN 200780033092 A CN200780033092 A CN 200780033092A CN 101512138 A CN101512138 A CN 101512138A
Authority
CN
China
Prior art keywords
insulator
vaporizer
path
pump
acceleration pump
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.)
Pending
Application number
CNA2007800330921A
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Chinese (zh)
Inventor
小野凉
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.)
Komatsu Zenoah Co
Husqvarna Zenoah Co Ltd
Original Assignee
Komatsu Zenoah Co
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 Komatsu Zenoah Co filed Critical Komatsu Zenoah Co
Publication of CN101512138A publication Critical patent/CN101512138A/en
Pending 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
    • 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

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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 The Air-Fuel Ratio Of Carburetors (AREA)
  • Compressor (AREA)

Abstract

An insulator (2) in which a housing (5) is integrally molded with a heat insulation section (20) at its lower part, where the housing (5) forms a part of a housing (64) of an acceleration pump (6). The construction enables the acceleration pump (6) to be placed at that portion directly around the insulator (2) that is conventionally a dead space, eliminating the need for a dedicated space for installing the acceleration pump to achieve space saving. In addition, because the acceleration pump (6) is at a portion around the heat insulation section (20), even if a pipe is used to interconnect a leading air passage (21) in the insulator and the acceleration pump (6), the length of the piping can be reduced to simplify the structure of the interconnection. Also, since the housing (5) is integrally formed with the heat insulation section (20), the number of parts can be reduced to reduce costs and facilitate assembly of the acceleration pump (6).

Description

Insulator
Technical field
The present invention relates to the motor insulator, for example relate to the insulator that uses in the stratified scavenging two-stoke cycle engine.
Background technique
In two stroke engine, utilize piston to open and close relief opening and scavenging port.When opening relief opening when descending by piston, combustion gas are discharged as waste gas, and the mixed gas in the crankcase flows in the cylinder via the scavenging path from the scavenging port of roughly opening simultaneously.The mixed gas that flows into was also having a small amount of outflow to mixed gas self when remaining in combustion gas in the cylinder to carry out scavenging before piston is closed relief opening.Therefore; though it is a small amount of; but the unburned fuel in the mixed gas is discharged with waste gas, causes the reduction because of the fuel availability (combustion Charges) that fuel loss causes, and need be used for not making the muffler configuration of unburned fuel to the complexity of outside discharge from the environmental protection angle.
For addressing this problem, stratified scavenging two-stoke cycle engine has been proposed.Stratified scavenging two-stoke cycle engine possesses the guiding air flue that is communicated with the scavenging path.Thus, can be before scavenging, with the upper side in the guiding air suction scavenging path, when scavenging, this guiding air at first carries out scavenging to the combustion gas in the cylinder, so mixed gas is difficult for flowing out.Thereby, realize the improvement of fuel availability, and do not need complicated muffler configuration.
On the other hand, be not limited to stratified scavenging two-stoke cycle engine, in common motor, generally unloaded (idling) running under lean mixture gas state.But, under the situation of stratified scavenging two-stoke cycle engine, when when unloaded state quickens suddenly, because the initial guiding air that has from the scavenging path of supplying with in cylinder, so can not supply with the mixed gas of abundant fuel ratio, become the more serious state of lean mixture gasization, produce bad Acceleration or motor and stop.
As its solution, proposed to be installed in the accelerating unit (for example patent documentation 1) of moment increase fuel quantity when quickening.
The accelerating unit of patent documentation 1 has: vaporizer; Be arranged on and suppress between vaporizer and the motor from the insulator of the heat transfer of motor; The accelerating pump that is connected with vaporizer, described accelerating unit are to be communicated with the insulator guiding air flue of insulator and the structure of accelerating pump with pipe arrangement.
Patent documentation 1: 2001-No. 123841 communiques of TOHKEMY.
But in the accelerating unit of record, therefore accelerating pump, except that insulator and vaporizer, also needs to guarantee separately the space that is provided with of accelerating pump away from insulator and vaporizer setting in this patent documentation 1, the problem that exists size to increase.In addition, because accelerating pump is connected by pipe arrangement with insulator, so when accelerating pump is configured in position away from insulator and vaporizer, have connection structure based on the pipe arrangement complicated problems that becomes.
Summary of the invention
Main purpose of the present invention is to provide and can makes the connection simple structure, and can realize the insulator of motor surrounding space economized.
Insulator of the present invention is characterised in that to possess: insulation part, and it is arranged between motor and the vaporizer, and has insulator guiding air flue and insulator mixed gas path; Chest portion, itself and described insulation part are integrally formed, and constitute the part of accelerating pump casing.
According to the present invention as can be known, by constituting the part of accelerating pump casing with the integrally formed chest portion of insulation part, thereby can around existing insulator, dispose accelerating pump, and not need the space that is provided with of accelerating pump special use as idle space (dead space), can the implementation space economized.And, since accelerating pump directly be configured in insulation part around, so even, also can shorten piping length, thereby can make the connection simple structure using pipe arrangement to be communicated with under the situation of insulator guiding air flue and accelerating pump.In addition, because chest portion and insulation part are integrally formed, thus can reduce the parts number of packages, thus can realize the reduction of cost, and, can make the assembling of accelerating pump easy.
Description of drawings
Fig. 1 is the sectional view of the insulator structure on every side of expression an embodiment of the present invention.
Fig. 2 is the sectional view from the insulator of vaporizer side observation.
Fig. 3 is the exploded perspective view of accelerating pump.
Among the figure, 1-motor, 2-insulator, 3-vaporizer, 5-chest portion, 6-accelerating pump, 20-insulation part, 21-insulator guiding air flue, 22-insulator mixed gas path, 64-casing.
Embodiment
Below, based on accompanying drawing one embodiment of the present invention is described.
Fig. 1 is the sectional view of insulator 2 structure on every side of expression an embodiment of the present invention, and Fig. 2 is that Fig. 3 is the exploded perspective view of accelerating pump 6 from the sectional view of the insulator 2 of vaporizer 3 sides observation.
As shown in Figure 1, the stratified scavenging two-stoke cycle engine 1 that insulator 2 is installed has: be communicated with the motor guiding air flue 11 of scavenging path and the engine mixed gas body path 12 that is communicated with crankcase, in breathing process, suck guiding air and mixed gas by each path 11,12.Vaporizer 3 is installed in described motor 1 by insulator 2.
In vaporizer 3, vaporizer guiding air flue 31 is arranged at upside, and vaporizer mixed gas path 32 is arranged at downside, and is provided with the level pressure fuel supply mechanism 4 to vaporizer mixed gas path 32 fuelings in the bottom.Level pressure fuel supply mechanism 4 comprises: across dividing plate 40 is the vaporizer level pressure chamber 41 of downside by zoning; By zoning is the level pressure fuel chambers 42 of upside; Be communicated with the not shown fuel tank and the internal flow path 43 of level pressure fuel chambers 42; Be arranged on the petrolift midway 44 of internal flow path 43.
Vaporizer level pressure chamber 41 is communicated with atmosphere by access 410.Level pressure fuel chambers 42 has the needle value 421 that the intercommunicating pore 420 that is communicated with internal flow path 43 and level pressure fuel chambers 42 is opened and closed, and from fuel supply road 422 to vaporizer mixed gas path 32 fuelings.(pulsatile pressure) pressed in pulsation by the crankcase that transmits from motor 1, and petrolift 44 moves up and down dividing plate 45.Promptly, when fuel from level pressure fuel chambers 42 by fuel supply road 422 when vaporizer mixed gas path 32 is supplied with, open intercommunicating pore 420 by needle value 421, petrolift 44 moves up and down dividing plate 45, thus, be supplied in level pressure fuel chambers 42 from fuel tank sucking-off fuel.
Insulator 2 is to suppress from the plastic member of motor 1 to vaporizer 3 heat transfers, and possesses: the insulation part 20 that suppresses heat transfer usefulness; Below insulation part 20 with insulation part 20 by the integrally formed chest portion that forms 5.
Insulation part 20 has: the insulator guiding air flue 21 that is communicated with motor guiding air flue 11 and vaporizer guiding air flue 31; And the insulator mixed gas path 22 that is communicated with engine mixed gas body path 12 and vaporizer mixed gas path 32.As shown in Figure 2, the downside at this insulator mixed gas path 22 is provided with pulsation transmission path 23.Pulsation transmission path 23 1 ends are communicated with the crankcase of motor 1, and the other end is communicated with the petrolift 44 of vaporizer 3, and the pulsation pressure of crankcase is passed to petrolift 44.In addition, be provided with first path 24 that extends to side (right side Fig. 2) from insulator guiding air flue 21 in insulation part 20.First path 24 is communicated with pipe arrangement 71, and this pipe arrangement 71 is made of the flexible pipe 70 between the conduit 25 that is installed in insulation part 20, the conduit 52 that is installed in chest portion 5 and the connecting duct 25,52.
As shown in Figure 3, worn first connect apertures 26A～26D in the bight of insulation part 20.Burying nut 27 between connect apertures 26A, the 26B and between connect apertures 26C, the 26D underground.Be equipped with the second connect apertures 28A, 28B in the position corresponding with nut 27.Insulator 2 is installed on motor 1 by the tapped hole that the not shown screw that inserts first connect apertures 26A～26D is screwed together in motor 1 side.In addition, vaporizer 3 is screwed together in nut 27 by the screw that connects vaporizer 3 and the second connect apertures 28A, 28B and is installed on motor 2.
Accelerating pump 6 comprises: the described chest portion 5 that forms funnel-like (ロ-ト shape); By the dividing plate 60 that supports with the flange shape support part 50 that is formed on the inner peripheral surface of chest portion 5; Be embedded in the outstanding spring guide portion 51 that is provided with in bottom of chest portion 5, and be arranged on the spring 61 between chest portion 5 and the dividing plate 60; Embed chest portion 5, and across the lid 63 of packing ring 62 clamping support parts 50 and dividing plate 60.
Here, in the present embodiment, constitute the casing 64 of accelerating pump 6 by chest portion 5 and lid 63.In addition, as shown in Figure 1, in casing 64 volume inside, utilize by dividing plate 60 and separate and the space that contains spring 61 forms negative pressure chamber 65, utilize the space formation pump chamber 66 that covers 63 sides.
Base portion 53 in chest portion 5 is provided with the alternate path 54 (with reference to Fig. 2) that is communicated with pipe arrangement 71.And, form pressure by first path 24, alternate path 54 and pipe arrangement 71 and import path 7, import path 7 by this pressure and guide the negative pressure in the air flue 21 to be delivered to negative pressure chamber 65 insulator.
Be provided with insertion mouth 67 at lid 63.Be inserted with from the vaporizer 3 outstanding teats 46 that are provided with at insertion mouth 67.Pump chamber 66 is communicated with vaporizer level pressure chamber 41 by access 68 that wears in insertion mouthful 67 inboards and the access 460 that are provided with in teat 46 inside.
Therefore, present embodiment is a part that constitutes the casing 64 of accelerating pump 6 by chest portion 5, and below the insulation part 20 and the mode of the spatial configuration accelerating pump 6 between motor 1 and vaporizer 3, and this space is in the past without any the idle space of configuration.Therefore, in the present embodiment, effectively utilize this space and accelerating pump 6 is set, can the implementation space economized.
In addition, because chest portion 5 is integrally formed with insulation part 20, thus can reduce the parts number of packages, thus can realize the reduction of cost, and make assembling easily.And then, because accelerating pump 6 be configured in insulation part 20 under, so can make the shorten length of the pipe arrangement 71 that is communicated with the negative pressure chamber 65 in insulator guiding air flue 21 and the accelerating pump 6, thereby can make the connection simple structure.
In addition, in existing accelerating pump as stated in the Background Art, be provided with the next door at box house and form member, form the guide portion that member is provided with guide springs in this next door.But, present embodiment, be wholely set in chest portion 5 by spring guide portion 51 guide springs 61, become the structure that does not need the next door to form member, therefore can further cut down the parts number of packages, and, can make the space in the casing 64 do not need reduce the next door to form the amount of member, make accelerating pump 6 miniaturizations, thereby further promote space-savingization.
Above-mentioned vaporizer 3 and insulator 2 as following work.
At first, when zero load, vaporizer guiding air flue 31 is closed with the throttle valve interlock of vaporizer mixed gas path 32, and therefore, by the suction operation of motor 1 side, each guides in the air flue 11,21,31 becomes negative pressure.Negative pressure imports path 7 from insulator guiding air flue 21 by pressure and imports negative pressure chamber 65, and the elastic force of dividing plate 60 antagonistic springs 61 is pushed negative pressure chamber's 65 sides to.But throttle valve is opened when motor 1 quickens, therefore, interlock with it, insulator guiding air flue 21 is open, the negative pressure pop-off.
Thus, dividing plate 60 turns back to pump chamber 66 sides because of elastic force moment of spring 59, the air of pump chamber 66 via access 68,460 to vaporizer level pressure chamber 41 force feeds.Therefore, the dividing plate 40 of zoning level pressure fuel chambers 42 and vaporizer level pressure chamber 41 is boosted, and the fuel of level pressure fuel chambers 42 is pressurized, makes the fuel quantity that is supplied in vaporizer mixed gas path 32 increase.Thereby when quickening suddenly, by the delivery volume of accelerating pump 6 moments increase fuel, therefore, even when quickening suddenly, motor 1 also can quicken smoothly.At this moment, recently the internal diameter of the access 68,460 of autoacceleration pump 6 sides is little to be communicated with the internal diameter of access 410 of vaporizer level pressure chamber 41 and atmosphere, therefore, can boost dividing plate 40 on the vaporizer level pressure chamber 41 reliably from the air of access 68,460 force feeds.
In addition, be used for implementing optimum structure of the present invention, method etc. and disclose, but the present invention is not limited to this in above narration.Promptly, the present invention is primarily aimed at specific mode of execution and has carried out special diagram and explanation, but in not breaking away from technological thought of the present invention and purpose scope, those skilled in the art can be to above-described mode of execution, various distortion in addition on shape, quantity, other detailed structures.
Therefore, the narration that defines shape, quantity etc. of above-mentioned announcement has just been carried out exemplary narration in order to understand the present invention easily, be not to limit the present invention, the member narration nominally of therefore having removed part or all qualification of those shapes, quantity etc. is also included among the present invention.
For example, the pressure that is communicated with insulator guiding air flue 21 and negative pressure chamber 65 imports path 7 and can not comprise pipe arrangement 71 and constitute, also can be by constituting with the bottom: the groove that is provided with at the junction surface of insulation part 20 and motor 1; Be arranged on insulation part 20 inside, be communicated with the path of insulator guiding air flue 21 and groove; Be arranged on insulation part 20 inside and chest portion 5 inside, be communicated with the path of negative pressure chamber 65 and groove.At this moment, can cancel being arranged on outside pipe arrangement 71, thereby can make the connection structure simpler, and can promote space-savingization.In addition, pressure importing path 7 also can comprise the groove of the junction surface that is arranged on insulation part 20 and vaporizer 3 and constitute.
In the accelerating pump 6 of present embodiment, spring guide portion 51 is integrally formed in the casing 64, but, also the next door shown in the patent documentation 1 as stated in the Background Art can be formed member is arranged in the casing 64, by forming member spring guide portion 51 is set, and supports an end of spring 61 in this next door.
Industrial applicibility
The present invention can be used as the acceleration that is arranged between stratified scavenging two-stoke cycle engine and the vaporizer Pump-integrated insulator is used for the portable work machines such as air blast and brush cutting machine etc.

Claims (1)

1. insulator is characterized in that possessing:
Insulation part, it is arranged between motor and the vaporizer, and has insulator guiding air flue and insulator mixed gas path;
Chest portion, itself and described insulation part are integrally formed, and constitute the part of accelerating pump casing.
CNA2007800330921A 2006-09-06 2007-09-06 Insulator Pending CN101512138A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006241099A JP2008063983A (en) 2006-09-06 2006-09-06 Insulator
JP241099/2006 2006-09-06

Publications (1)

Publication Number Publication Date
CN101512138A true CN101512138A (en) 2009-08-19

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ID=39157300

Family Applications (1)

Application Number Title Priority Date Filing Date
CNA2007800330921A Pending CN101512138A (en) 2006-09-06 2007-09-06 Insulator

Country Status (4)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104411569A (en) * 2012-02-10 2015-03-11 标致·雪铁龙汽车公司 Heat shield having a projection bearing against a component

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2399494T3 (en) 2008-03-25 2013-04-01 Honda Motor Co., Ltd. Engine fuel supply device
JP5118527B2 (en) * 2008-03-25 2013-01-16 本田技研工業株式会社 Engine fuel supply system
JP5118528B2 (en) * 2008-03-25 2013-01-16 本田技研工業株式会社 Engine fuel supply system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5922976U (en) * 1982-07-31 1984-02-13 株式会社京浜精機製作所 Fuel pump
JP3728156B2 (en) * 1999-10-21 2005-12-21 株式会社日本ウォルブロー Accelerator for 2-stroke engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104411569A (en) * 2012-02-10 2015-03-11 标致·雪铁龙汽车公司 Heat shield having a projection bearing against a component

Also Published As

Publication number Publication date
WO2008029875A1 (en) 2008-03-13
US20100193166A1 (en) 2010-08-05
JP2008063983A (en) 2008-03-21

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Open date: 20090819