CN1069739C - Starting fuel regulator for carburetor - Google Patents

Starting fuel regulator for carburetor Download PDF

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Publication number
CN1069739C
CN1069739C CN97114686A CN97114686A CN1069739C CN 1069739 C CN1069739 C CN 1069739C CN 97114686 A CN97114686 A CN 97114686A CN 97114686 A CN97114686 A CN 97114686A CN 1069739 C CN1069739 C CN 1069739C
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CN
China
Prior art keywords
passage portion
side aperture
downstream side
air suction
upstream side
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Expired - Fee Related
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CN97114686A
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Chinese (zh)
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CN1172209A (en
Inventor
上田稔
赤松俊二
加藤光雄
田畑道夫
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Publication of CN1172209A publication Critical patent/CN1172209A/en
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Publication of CN1069739C publication Critical patent/CN1069739C/en
Anticipated expiration legal-status Critical
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    • 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
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/04—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling being auxiliary carburetting apparatus able to be put into, and out of, operation, e.g. having automatically-operated disc valves
    • F02M1/046—Auxiliary carburetting apparatus controlled by piston valves

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Means For Warming Up And Starting Carburetors (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

A carburetor main body is provided with an upper-stream side opening adjusting passage part and a lower-stream side opening adjusting passage part, and provided with a slide-movement hole opened to the inside surface by making those opening adjusting passage parts to face each other. And a slide-movement throttle valve is slidably fitted in the slide-movement hole so as to directly control the opening area of the opening part to the slide-movement hole so that the bottom part of the lower-stream side opening adjusting passage part, may be arranged downward by setting a step difference from the bottom of the upper-stream side opening adjusting passage part.

Description

The starting fuel regulator of Carburetor
The present invention relates to the starting fuel regulator of Carburetor, this device has slide adjusting valve, temperature-sensitive driving mechanism and electric heater.Sliding throttle valve is used to regulate the opening area of employing air suction way, this air-breathing upper reaches end and dirty end that is located at the main air suction way on the Carburetor body that connect with path.The temperature-sensitive driving mechanism makes the sliding throttle valve start according to the wax of adorning in the housing because of the breathing of temperature variation, and this housing is positioned at the fixed position of Carburetor body.Electric heater can heat above-mentioned wax and be connected with housing.
This type of device of the prior art is for example disclosed for fair 3-6844 number by Japanese Utility Model communique reality.In this starting fuel regulator, sleeve is pressed in the Carburetor body, this sleeve is provided with opening that is communicated with the upper reaches end of main air suction way and the opening that is communicated with the dirty end of main air suction way, and sliding throttle valve slides in this sleeve, to control the opening area of above-mentioned two openings.
Therefore, above-mentioned starting fuel regulator needs sleeve, and required number of parts is many, needs simultaneously sleeve is assembled on the Carburetor body, and the assembling operation operation is also many.In addition, because the making error of sleeve itself reaches the assembly error when assembling on the Carburetor body, employ the variation that produces the circulation area between Carburetor body and the sleeve in the air suction way inevitably rising, along with the variation of this circulation area, a control accuracy reduction of employing the delivery volume and the concentration of mixed gas.
The present invention makes in view of the above problems, and its purpose is to provide a kind of can reduce number of parts, improved the Carburetor starting fuel regulator of employing mixed gas delivery volume and concentration control accuracy.
To achieve these goals, the starting fuel regulator of the Carburetor of the 1st invention has sliding throttle valve, temperature-sensitive driving mechanism and electric heater; Sliding throttle valve is used to regulate the opening area of employing air suction way, and this employs upper reaches end and dirty end that air suction way connects the main air suction way on the Carburetor body; The temperature-sensitive driving mechanism makes the sliding throttle valve start according to the wax of adorning in the housing because of the breathing of temperature variation, and this housing is positioned at the fixed position of Carburetor body; Electric heater can heat above-mentioned wax and be connected with housing; It is characterized in that, on the Carburetor body, be provided with the upstream side aperture and regulate passage portion, downstream side aperture and regulate passage portion and make above-mentioned two apertures regulate passage portion relative to one another at the sliding eye of inner side surface opening; Sliding throttle valve is entrenched in this sliding eye the opening area towards the opening portion of sliding eye of regulating path with direct control two apertures slidably, upstream side aperture adjusting passage portion communicates with the upper reaches end of main air suction way and has constituted a part of employing air suction way, downstream side aperture passage portion communicates with the dirty end of main air suction way and has constituted a part of employing air suction way, and the downstream side aperture is regulated passage portion is regulated in the bottom of passage portion than upstream side aperture low height difference in bottom.
The 2nd invention is on the basis of the 1st invention, it is characterized in that, the downstream side aperture regulates passage portion and upstream side aperture passage portion is to form like this: extract direction towards the direction of downstream side aperture adjusting passage portion as core regulate passage portion from the upstream side aperture, form simultaneously when the cast form of Carburetor body with the form of blowhole, perhaps the downstream side aperture after the above-mentioned cast form is regulated the bore a hole processing and forming of passage portion side.
The 3rd invention is on the basis of the 2nd invention, it is characterized in that, one of stripping direction when above-mentioned core is extracted direction with the cast form of Carburetor body out is parallel.
The 4th invention is on the basis of the 2nd invention, it is characterized in that, work the upstream side passage portion employ air suction way and to be communicated with main air suction way upper reaches end, downstream side passage portion that dirty end is communicated with the dirty end of main air suction way, be communicated with and be communicated with and constitute towards the downstream side aperture adjusting passage portion of sliding eye opening towards the upstream side aperture adjusting passage portion of sliding eye opening, with the upper reaches end of downstream side passage portion with the dirty end of upstream side passage portion by the upper reaches end; The upstream side aperture that is processed to form with perforation is regulated the internal diameter that passage portion and downstream side aperture regulate passage portion and is configured to bigger than the internal diameter of upstream side passage portion and downstream side passage portion.
According to the starting fuel regulator of the Carburetor of the 1st invention, on the Carburetor body, be provided with the upstream side aperture and regulate passage portion, downstream side aperture and regulate passage portion and make above-mentioned two apertures regulate passage portion relative to one another at the sliding eye of inner side surface opening; Sliding throttle valve is entrenched in this sliding eye the opening area towards the opening portion of sliding eye of regulating path with direct control two apertures slidably, upstream side aperture adjusting passage portion communicates with the upper reaches end of main air suction way and has constituted a part of employing air suction way, downstream side aperture passage portion communicates with the dirty end of main air suction way and has constituted a part of employing air suction way, and the downstream side aperture is regulated passage portion is regulated in the bottom of passage portion than upstream side aperture low height difference in bottom.So, do not need sleeve, can reduce number of parts and assembling procedure, and the upper limit that sucks air quantity at the upstream side of sliding throttle valve is limited, and improves the negative suction in the sliding throttle valve part, when sliding throttle valve cuts out, avoid the rapid reduction of air fuel ratio, can improve control accuracy.
The 2nd invention increased following characteristics on the basis of the 1st invention, promptly, the downstream side aperture regulates passage portion and upstream side aperture passage portion is to form like this: extract direction towards the direction of downstream side aperture adjusting passage portion as core regulate passage portion from the upstream side aperture, form simultaneously when the cast form of Carburetor body with the form of blowhole, perhaps the downstream side aperture after the above-mentioned cast form is regulated bore a hole processing and forming of passage portion.So the formation that the downstream side aperture is regulated passage portion and upstream side aperture adjusting passage portion is easy.
The 3rd invention increased following characteristics on the basis of the 2nd invention, that is, one of stripping direction when above-mentioned core is extracted direction with the cast form of Carburetor body out is parallel.So the simple structure of casting device can be boosted productivity and reduce cost.
The 4th invention increased following characteristics on the basis of the 2nd invention, that is, rise downstream side passage portion that the upstream side passage portion of employing air suction way and being communicated with main air suction way upper reaches end by the upper reaches end, dirty end be communicated with the dirty end of main air suction way, be communicated with the dirty end of upstream side passage portion and regulate passage portion, be communicated with and constitute towards the downstream side aperture adjusting passage portion of sliding eye opening with the upper reaches end of downstream side passage portion towards the upstream side aperture of sliding eye opening; It is bigger than the internal diameter of upstream side passage portion and downstream side passage portion that the upstream side aperture that is processed to form with perforation is regulated the internal diameter that passage portion and downstream side aperture regulate passage portion.So, available perforation easy processing ground formation upstream side aperture adjusting passage portion and downstream side aperture are regulated passage portion, and can keep with the upstream side aperture adjusting passage portion and the downstream side aperture adjusting passage portion of the compound section shape that forms with blowhole equal performance being arranged.
Fig. 1 is the profile diagram of the 1st embodiment's starting fuel regulator, is the sectional view along 1-1 line among Fig. 2.
Fig. 2 is the cross-section profile along the Carburetor body of 2-2 line among Fig. 1.
The amplification profile diagram of 3-3 line among Fig. 3 Fig. 2.
Fig. 4 is the air mass flow performance plot of expression along with the sliding throttle valve start.
Fig. 5 is the plotted curve that concerns between expression ambient temperature and the air quantity/fuel quantity.
Fig. 6 is a profile diagram of representing the Carburetor body part after the cast form just.
Fig. 7 is the expression figure that makes momentum corresponding with the temperature of sliding throttle valve.
Fig. 8 is the cross-section profile of the 2nd embodiment's Carburetor body.
Fig. 9 is the 9-9 line amplification profile diagram among Fig. 8.
Figure 10 is the cross-section profile of the 3rd embodiment's Carburetor body.
Below, with reference to the description of drawings embodiments of the invention.
Fig. 1 to Fig. 7 represents the 1st embodiment of the present invention.Fig. 1 is the profile diagram of starting fuel regulator, is the sectional view along 1-1 line among Fig. 2.Fig. 2 is the cross-section profile along the Carburetor body of 2-2 line among Fig. 1.The amplification profile diagram of 3-3 line among Fig. 3 Fig. 2.Fig. 4 is the air mass flow performance plot of expression along with the sliding throttle valve action.Fig. 5 is the plotted curve that concerns between expression ambient temperature and the air quantity/fuel quantity.Fig. 6 is a profile diagram of representing the Carburetor body part after the cast form just.Fig. 7 is the expression figure that makes momentum corresponding with the temperature of sliding throttle valve.
Among Fig. 1 and Fig. 2, be installed on the Carburetor body 10 of the Carburetor on the motor bike,, between this float chamber body 11 and Carburetor body 10, form float chamber 12 in conjunction with float chamber body 11.Carburetor body 10 and float chamber body 11 are respectively by light metal casting formings such as aluminum alloys and make.
On Carburetor body 10, in be provided with main air suction way 13 and rise and employ air suction way 15 1, rise and employ air suction way 15 1Connection is along the upper reaches end and the dirty end of this main air suction way 13 of main air suction way 13 inspiratory direction 14, employs air suction way 15 rising 1Setting starting fuel regulator 21 in the way.
Rise and employ air suction way 15 1Regulate passage portion 18 by upstream side passage portion 16, downstream side passage portion 17, upstream side aperture 1Regulate passage portion 19 with the downstream side aperture 1Constitute, upper reaches and downstream side aperture are regulated passage portion 18 1, 19 1Be parallel to main air suction way 13.The transverse section of upstream side passage portion 16 is circular, and its upper reaches end links to each other with the upper reaches end of main air suction way 13, and past more downstream side is more away from the linearly shape extension of main air suction way 13 ground.The dirty end of downstream side passage portion 17 links to each other with the dirty end of main air suction way 13, and past more upstream side is more away from the linearly shape extension of main air suction way 13 ground.The upstream side aperture is regulated passage portion 18 1Communicate with the dirty end of upstream side passage portion 16.The downstream side aperture is regulated passage portion 19 1Communicate with the upper reaches end of downstream side passage portion 17.
Starting fuel regulator 21 has starting fuel nozzle 22, be used to regulate the sliding throttle valve 23 of employing air suction way 15 opening areas, by this sliding throttle valve 23 keeping and the starting fuel nozzle 22 of packing in metering needle-valve 24, drive the temperature-sensitive driving mechanism 25 of sliding throttle valve 23 and as the PTC type heater 26 of electric heater, an end of the housing 46 in this PTC type heater 26 and the temperature-sensitive driving mechanism 25 is connected.
Sliding throttle valve 23 is entrenched in the transverse section slidably in the circular sliding eye 20, and this sliding eye 20 is located on the Carburetor body 10 and perpendicular to upstream side and downstream side aperture and regulates passage portion 18 1, 19 1, the upstream side aperture is regulated passage portion 18 1Dirty end and downstream side aperture regulate passage portion 19 1The upper reaches end at the inner face of this sliding eye 20 opening toward each other.
Between Carburetor body 10 and float chamber body 11, form the starting fuel chamber 28 of extending coaxially with sliding eye 20, folder is being established next door 27 between the lower end of fuel chambers 28 and sliding eye 20.Next door 27 is provided with hole 29, and the state that starting fuel nozzle 22 stretches into starting fuel chamber 28 with its underpart is pressed into and is fixed in this hole 29.The upper end portion of this starting fuel nozzle 22 is configured in apart from the lower end of sliding eye 20 position of top slightly.
On float chamber body 11, be pressed into and fixing fuel atomizer 30, bottom in these fuel atomizer connection starting fuel chambers 28 30 and the bottom in the float chamber 12.On Carburetor body 10, be provided with path 31, the top in the part that this path 31 connects the fuel oil pasta L top in float chambers 12 and the starting fuel chamber 28.
The upstream side and the downstream side aperture of opening are regulated passage portion 18 toward each other at the inner face of sliding eye 20 1, 19 1Has transverse shape shown in Figure 3.That is, two apertures are regulated passage portion 18 1, 19 1Section constitute with the following hole 18b of portion, the 19b that link to each other with the bottom of the 18a of hole portion, 19a on this by the 18a of hole portion, 19a on the protruding semicircle in top, the following hole 18b of portion, 19b are oblong along the Zhou Fangxiang of sliding eye 20.The following hole 18b of portion, 19b expand the formation of turning up the soil than the last hole 18a of portion, 19a on promptly vertical with the glide direction of sliding throttle valve 23 direction of the Zhou Fangxiang of sliding eye 20.The downstream side aperture is regulated passage portion 19 1The bottom promptly descend the bottom of the 19b of hole portion, regulate passage portion 18 than upstream side aperture 1The bottom promptly descend low height difference h in bottom of the 18b of hole portion.
Because upstream side and downstream side aperture are regulated passage portion 18 1, 19 1As forming above-mentionedly, so, under the ambient temperature condition with higher, can make starting with air suction way 15 1Opening area bigger.Regulate passage portion 18 at upstream side and downstream side aperture 1, 19 1For coaxial, during with footpath circular, rising under the hot environment employed air suction way 15 1The suction air quantity shown in the dotted line of Fig. 4, and suction air quantity of the present invention is shown in solid line among Fig. 4, than big shown in the dotted line.So can prevent the overrichization of mixed gas effectively, be expected to improve the startability of motor in the period of being warm.
Along with the rising of ambient temperature, sliding throttle valve 23 has cut out two apertures and has regulated path 18 1, 19 1The time, if there is not height difference, two apertures are regulated path 18 1, 19 1Close simultaneously, then shown in the dotted line among Fig. 5, the negative pressure that acts on the starting fuel nozzle 22 reduces, and fuel sucking-off amount reduces, and air fuel ratio sharply descends.But among the present invention, because the downstream side aperture is regulated passage portion 19 1The bottom regulate passage portion 18 than upstream side aperture 1The low height difference h in bottom, even the upstream side aperture is regulated passage portion 18 1Close, the downstream side aperture is regulated passage portion 19 1Also opening a bit, so the upstream side by stopped nozzles 22 improves the negative pressure that acts on the starting fuel nozzle 22, as shown in Figure 5, can avoid the rapid reduction of air fuel ratio.
The upstream side of this special shape and downstream side aperture are regulated passage portion 18 1, 19 1With the formation method of circular port 32 as shown in Figure 6, be when the cast form of Carburetor body 10, regulating passage portion 18 with the unshowned core of figure 1, 19 1Forming blowhole with circular port 32 places forms.Above-mentioned circular port 32 is regulated passage portion 18 in the upstream side aperture 1Opposition side, regulate path 19 with the downstream side aperture 1Conjointly at the outer side surface opening of Carburetor body 10.Two apertures are regulated passage portion 18 1, 19 1Reach the main air suction way 13 that circular port 32 is parallel to Carburetor body 10, when the cast form of Carburetor body 10, extend in the direction parallel with the blowhole of main air suction way 13.Therefore, as shown in arrow 34, regulating passage portion 18 from the upstream side aperture 1Regulate passage portion 19 towards the downstream side aperture 1Direction and also extract the parallel direction of direction out and extract direction out as core with the core of the blowhole of main air suction way 13, when the casting of Carburetor body 10, form blowhole.At this moment, diameter is less than the blowhole 20 of sliding eye 20 ' regulate passage portion 18 with two apertures 1, 19 1Reach circular port 32 and be formed on together on the Carburetor body 10, shown in dotted line, this blowhole 20 ' processing of boring a hole has just been formed sliding eye 20.Being pressed into of circular port 32 internal cause spheroids 33 and as shown in Figures 1 and 2 by inaccessible.
Again referring to Fig. 1, be provided with support plate 35 integratedly at lower end inner face near sliding throttle valve 23, the upper end of running through the metering needle-valve 24 of this support plate 35 is engaging back-up ring 36, this back-up ring 36 be connected to support plate 35 above, back-up ring 36 is pressed against on the support plate 35 by spring 37, like this, metering needle-valve 24 remains on the sliding throttle valve 23.In the upper end of sliding throttle valve 23, be provided with the joint flange 38 that stretch out the side in its radial direction, the joint teat 40 that is located at location cylinder 39 lower ends can engage with this joint flange 38 from the below.Above-mentioned spring 37 is located between location cylinder 39 and the back-up ring 36 with being the compression shape, and the elastic force of spring 37 presses against back-up ring 36 on the support plate 35, and joint teat 40 is engaged with joint flange 38.
On Carburetor body 10, be connected with the installation tube portion 41 of diameter coaxially with sliding eye 20 greater than sliding eye 20, form stepped part 42 between the outer end of this installation tube portion 41 and sliding eye 20.Be entrenched in the installation tube portion 41 base end part of the maintenance tube 43 that extends along the glide direction of sliding throttle valve 23 and stepped part 42 butts.Front end in installation tube portion 41, the fixing baffle plate 44 of screw part that is not shown by figure engages with the restriction stepped part 45 that is located at maintenance tube 43 peripheries, like this, keeps the base end part of tube 43 to be fixed on the Carburetor body 10.
Temperature-sensitive driving mechanism 25 has and is contained in the housing 46 that keeps in the cylindrical shell 43, and an end of this housing 46 stretches out from the front end that keeps tube 43.This housing 46 is made of circular cylindrical shell main body 47 and conductive metal system calyptra 48, and shell main body 47 is made of conductive metal and has step, and calyptra 48 engages with an end ca(u)lk of shell main body 47.Between main casing 47 and calyptra 48, the peripheral portion of diaphragm 49 in clamping, and PTC type heater 26 is that calyptra 48 contacts with an end of housing 46.
Housing 46 one distolateral be to adorn wax 50 between calyptra 48 and the diaphragm 49.In the shell main body 47, at the opposition side of wax 50, in turn inserting fluid 51, sealed member 52 and the piston 53 of the rubber that joins with diaphragm 49 or silicon etc. from the diaphragm side, the part of piston 53 is that the other end of shell main body 47 stretches out from housing 46.
Housing 46 is entrenched in airtightly and keeps in the tube 43, and one is distolateral to be that calyptra 48 sides are stretched out from keeping tube 43 front ends.In keeping tube 43, but a distolateral slide relative of shell main body 47 ground is entrenched in the interior top of location cylinder 39, piston 53 from end that housing 46 stretches out coaxially with location cylinder 39 butts.Between the base end part and location cylinder 39 that keep tube 43, the spring 54 of compressive state is being set, this spring 54 pushes housing 46 upward by location cylinder 39 and piston 53, makes piston 53 total butts location cylinder 39.Therefore, piston 53 is connected with sliding throttle valve 23 linkedly by location cylinder 39.
Keeping on the tube 43, for example by screwing togather fixing removably plastic lid 55, this lid 55 have around keep tube 43 also distolateral the and PTC type heater 26 of covering shell 46 1 end tube portion 56 arranged.
The end that the tube part 56a that centers on maintenance tube 43 in the end tube portion 56 is arranged of this lid 55 is by end wall portion 56b obturation, and end wall portion 56b is as the thick heat storage unit of wall ratio tube part 56a.
At the inner face of the end wall portion 56b that end tube portion 56 is arranged, be provided with embedding hole 57 and diameter coupling recess 58 coaxially less than this embedding hole 57, an end of housing 46 is that the part of calyptra 48 is entrenched in the embedding hole 57.Inner face at this end wall portion 56a also is provided with the cylindrical shape teat 59 that inside side's side is stretched out slightly integratedly, and the inner face of this teat 59 aligns with embedding hole 57.
The portion of being connected with at tube part 56a and end wall portion 56b is provided with patchhole 60, deviates from from patchhole 60 by the chimeric heater side terminal 62 that stops of above-mentioned teat 59, and this heater side terminal 62 inserts from patchhole 60 and covers in 55.Be provided with patchhole 61 at end wall portion 56b, the heater side terminal 63 with engaging claw 63a inserts from patchhole 61 and covers in 55.Above-mentioned engaging claw 63a engages in case deviate from from patchhole 61 with coupling recess 58 with suppressing.
The calyptra 48 of housing 46 is entrenched in the embedding hole 57, clips PTC type heater 26 between calyptra 48 and heater side terminal 63.Because housing 46 is pushed upward by spring 54, so heater side terminal 63 can be realized being urged being fixed on the end wall portion 56b with PTC type heater 26 with being electrically connected.Between housing 46 and heater side terminal 62, be provided with and be the spring 64 that compresses shape, this spring 64 is made of conducting metal, its spring constant is littler than spring 54, heater side terminal 62 is pushed and is fixed on the end wall portion 56b by this spring 64, realizes being electrically connected of heater side terminals 62 and PTC type heater 26 by spring 64 and housing 46.
Above-mentioned lid 55 is covered with by synthetic resin system safety cover 68, forms air layer 70 between the outside of safety cover 68 and lid 55.Lower inner face at safety cover 68 is provided with several joint teats 69 that engage with the lower edge that covers 55 with suppressing ..., on lid 55, be provided with several ribs 66 integratedly ..., this rib 66 ... be used to keep to cover 55 and safety cover 68 between the interval.In also prominent integratedly several projections 71 of establishing of the inner face of safety cover 68 ..., this projection 71 ... be used to keep the inner face of safety cover 68 and the interval between the lid 55.
Lid 55 has integratedly from the convex joint part 65 that has end tube portion 56 outside sides to stretch out, and a pair of heater side terminal 62,63 towards these joint part 65 ground and row arrangement.On this joint part 65; the joiner 67 that is releasably connecting matrix; couple of conductor 72 is passed and is remained in the soft rope guide member 73, and this lead 72 links to each other with joint part 65 and is electrically connected with heater side terminal 62,63, and above-mentioned soft rope guide member 73 is located at the outer side surface of safety cover 68 integratedly.Side in two leads 72 is connected the opposing party's ground connection with the charging of alternator on being placed in motor bike with power coil.Therefore, along with the starting of motor, PTC type heater 26 is invested electric power.And PTC type heater 26 is along with its resistance value that increases of temperature uprises, because of heating become high temperature after resistance value uprise, the energising amount is limited.
The following describes the 1st embodiment's effect.During engine start, the wax 50 of temperature-sensitive driving mechanism 25 is in the swelling state corresponding with ambient temperature, and piston 53 is also corresponding with ambient temperature from the overhang of housing 46, and therefore, the activated position of sliding throttle valve 23 is also corresponding with ambient temperature.
When connecting main switch rotational power output shaft in order to pilot engine, the air of the amount corresponding with the activated position of sliding throttle valve 23 is from employing air suction way 15 1Suck launched machine, the circulation by this air is with the mixed gas supply engine.This mixed gas is formed by the fuel and the above-mentioned air mixing of 22 sucking-offs of starting fuel nozzle.
Starter-alternator start along with motor, because the start of this alternator, PTC type heater 26 is invested electric power, wax 50 is heated expansion because of the heating of this PTC type heater 26, the expansion of wax 50 makes piston 53 push sliding throttle valve 23 toward the below by location cylinder 39 and spring 37, and sliding throttle valve 23 is to having reduced to employ air suction way 15 1The direction start of opening area, final rising employed air suction way 15 1Be blocked, the supply of starting fuel stops.
In this starting fuel regulator 21, rise and employ air suction way 15 1Intermediate portion be that the upstream side aperture is regulated passage portion 18 1Regulate passage portion 19 with the downstream side aperture 1Be located on the Carburetor body 10.These apertures are regulated passage portion 18 1, 19 1At the inner face opening, be located at chimeric slidably sliding throttle valve 23 in the sliding eye 20 on the Carburetor body 10, directly control aperture adjusting passage portion 18 by sliding throttle valve 23 1, 19 1The opening portion towards sliding eye 20.Therefore, with being fixed in the sleeve on the Carburetor body 10 chimeric slidably sliding throttle valve 23 and comparing, because of not needing sleeve to reduce number of parts and reducing assembling procedure by mode such as being pressed into.In addition, setting under the situation of sleeve, because the assembly error of the making error of this sleeve and assembling on the Carburetor body 10, employing air suction way 15 1In, the variation that produces the circulation area between Carburetor body 10 and the sleeve inevitably, along with the variation of this circulation area, a control accuracy reduction of employing the delivery volume and the concentration of mixed gas.And as described above, directly control two apertures that are located on the Carburetor body 10 with sliding throttle valve 23 and regulate passage portion 18 1, 19 1The opening portion towards sliding eye 20, can improve above-mentioned control accuracy.
And, rise and employ air suction way 15 1Two apertures regulate passage portion 18 1, 19 1, its section configuration is the special transverse shape that is made of the last hole 18a of portion, 19a and the following hole 18b of portion, 19b, the following hole 18b of portion, 19b circumferentially are oblong and link to each other downstream side aperture adjusting passage portion 19 with the bottom of the last hole 18a of portion, 19a along sliding eye 20 1The bottom regulate passage portion 18 than upstream side aperture 1The low height difference h in bottom, two apertures are regulated passage portion 18 1, 19 1With the circular port 32 at the outer side surface opening of Carburetor body 10, all the core that does not show with figure when the cast form of Carburetor body 10 forms blowhole and forms, so two apertures are regulated passage portion 18 1, 19 1Form easily.In addition, when 10 cast forms of Carburetor body, two apertures are regulated passage portion 18 1, 19 1Extend in the direction parallel with circular port 32, so the simple structure of casting device can be boosted productivity and reduce cost with the blowhole of main air suction way 13.
Having in the temperature-sensitive driving mechanism 25 has the synthetic resin cap 55 of end tube portion 56 (this has a distolateral and PTC type heater 26 of 6 of end tube portion 56 covering shells 46) releasably to be fixed on to keep on the tube 43, the end wall portion 56b obturation of an end that centers on the tube part 56a that keeps tube 43 of end tube portion 56 by an end and the PTC type heater 26 of covering shell 46 arranged, and this end wall portion 56b is as the thick heat storage unit of wall ratio tube part 56a.Therefore, can make the heat retainer of end wall portion 56b bigger, the heat insulating ability that is contained in the wax 50 in housing 46 1 ends can be improved.Like this, the air layer 70 between the attenuate of can trying one's best lid 55 and the safety cover 68 can make starting fuel regulator 21 miniaturizations.Simultaneously, make the temperature-raising characteristic or the cooling characteristic of PTC type heater 26 milder, extensively the temperature of scope ground adjusting wax 50.
As mentioned above,, 25 miniaturizations of temperature-sensitive driving mechanism can be made, starting fuel regulator 21 miniaturization more can be made by improving heat insulating ability.That is, in the prior art, the stroke of the piston 53 in the temperature-sensitive driving mechanism 25 is bigger shown in Fig. 7 dotted line, but pass through the cooperation of wax 50 or the adjustment of amount, shown in the solid line of Fig. 7, more low temperature is shifted in the inflection point from required stroke to backlash, and the later backlash in inflection point can reduce.But, make 25 miniaturizations of temperature-sensitive driving mechanism after, heat retainer reduces, so the miniaturization difficulty of starting fuel device 21.As mentioned above, improve, shown in Fig. 7 solid line, can do one's utmost to reduce backlash along with lid 55 heat retainer increases heat insulating ability, can remedy miniaturization the minimizing of temperature-sensitive driving mechanism 25 heat retainers.Even starting fuel regulator 21 miniaturizations, also can with similarly keep its heating-cooling precision before.
But, when making the heat retainer minimizing of the housing 46 in the temperature-sensitive driving mechanism 25, must avoid the valve velocity ratio of closing of sliding throttle valve 23 when energising heats up PTC type heater 26 to accelerate before, for this reason, as long as set the internal driving of PTC type heater 26 highlyer than before, perhaps at PTC type heater 26 and between charging with power coil impedance is set, the warming velocity that suppresses PTC type heater 26 gets final product.
Lid 55 has joint part 65 integratedly, and a pair of heater side terminal 62,63 is towards this joint part 65.Owing on this joint part 65, releasably connecting joiner 67, so this joint part 65 and joiner 67 have increased more and cover 55 heat retainer, can improve the heat insulating ability after warming more, simultaneously, easy toward the signal earth of PTC type heater 26, can improve maintenance.
Fig. 8 and Fig. 9 represent the 2nd embodiment of the present invention, and Fig. 8 is the cross-section profile of Carburetor body, and Fig. 9 is the 9-9 line sectional view among Fig. 8.
Rise and employ air suction way 15 2Regulate passage portion 18 by upstream side passage portion 16, downstream side passage portion 17, upstream side aperture 2Regulate passage portion 19 with the downstream side aperture 2Constitute, upper reaches and downstream side aperture are regulated passage portion 18 2, 19 2Be parallel to main air suction way 13.The transverse section of upstream side passage portion 16 is circular, and its upper reaches end links to each other with the upper reaches end of main air suction way 13, and past more downstream side is more away from the linearly shape extension of main air suction way 13 ground.The dirty end of downstream side passage portion 17 links to each other with the dirty end of main air suction way 13, and past more upstream side is more away from the linearly shape extension of main air suction way 13 ground.The upstream side aperture is regulated passage portion 18 2Communicate with the dirty end of upstream side passage portion 16.The downstream side aperture is regulated passage portion 19 2Communicate with the upper reaches end of downstream side passage portion 17.Sliding throttle valve 23 (see figure 1)s are entrenched in the sliding eye 20 of being located at Carburetor body 10 slidably, and at the inner face of this sliding eye 20, the upstream side aperture is regulated passage portion 18 2Dirty end and downstream side aperture regulate passage portion 19 2Upper reaches end opening toward each other.
Upstream side and downstream side aperture are regulated path 18 2, 19 2As shown in Figure 9, form coaxial circular cross sections.And the downstream side aperture is regulated passage portion 19 2Diameter regulate passage portion 18 greater than the upstream side aperture 2, like this, the downstream side aperture is regulated passage portion 19 2The bottom regulate passage portion 18 than upstream side aperture 2Low height difference h.In addition, the internal diameter of upstream side passage portion 16 and downstream side passage portion 17 is regulated passage portion 18 less than the upstream side aperture 2With downstream side aperture passage portion 19 2Internal diameter.
Upstream side and downstream side aperture are regulated passage portion 18 2, 19 2Be after 10 cast forms of Carburetor body, regulate passage portion 19 from the downstream side aperture with the step drill that figure does not show 2Carburetor body 10 is bored a hole processing and formed.The downstream side aperture is regulated passage portion 19 2Outer end opening portion by being pressed into spheroid 33 obturation.
According to the 2nd embodiment, regulate passage portion 18 owing to directly control the upstream side aperture with sliding throttle valve 23 2Regulate passage portion 19 with the downstream side aperture 2The opening portion towards sliding eye, so, the same with the 1st embodiment, do not need sleeve, can reduce number of parts and assembling operation operation, improve control accuracy.
Owing to regulate passage portion 19 from the downstream side aperture 2To Carburetor body 10 processing of boring a hole, regulate passage portion 19 so can easily form the downstream side aperture 2The bottom regulate passage portion 18 than upstream side aperture 2The structure of a low height difference h because this structure, with the 1st embodiment similarly, when sliding throttle valve 23 inaccessible two apertures are regulated passage portion 18 2, 19 2The time, even the upstream side aperture is regulated passage portion 18 2Closed downstream side degree adjustment valve 19 2Also opening a bit, so can avoid air fuel ratio sharply to reduce.
In addition, because the upstream side aperture is regulated passage portion 18 2Regulate passage portion 19 with the downstream side aperture 2Internal diameter greater than the internal diameter of upstream side passage portion 16 and downstream side passage portion 17, so air suction way 15 is employed in rising when ambient temperature is higher 2Opening area can be bigger.Air suction way 15 is employed in rising under its result, hot environment 2The suction air quantity shown in the double dot dash line of Fig. 4, employ air suction way 15 near rising of the 1st embodiment's special shape shown in Figure 3 1The suction air quantity.Can prevent the overrichization of mixed gas effectively, be expected to improve the hot summer weather engine start in period.
Figure 10 represents the 3rd embodiment of the present invention, and the part corresponding with the various embodiments described above annotated with same numeral.
Rise and employ air suction way 15 3Regulate passage portion 18 by upstream side passage portion 16, downstream side passage portion 17, upstream side aperture 3Regulate passage portion 19 with the downstream side aperture 3Constitute.The transverse section of upstream side passage portion 16 is circular, and its upper reaches end links to each other with the upper reaches end of main air suction way 13, and past more downstream side is more away from the linearly shape extension of main air suction way 13 ground.The dirty end of downstream side passage portion 17 links to each other with the dirty end of main air suction way 13, and past more upstream side is more away from the linearly shape extension of main air suction way 13 ground.The upstream side aperture is regulated passage portion 18 3Communicate with the dirty end of upstream side passage portion 16.The downstream side aperture is regulated passage portion 19 3Communicate with the upper reaches end of downstream side passage portion 17.
The downstream side aperture is regulated passage portion 19 3Diameter regulate passage portion 18 than upstream side aperture 3Greatly, upstream side and dirty aperture are regulated passage portion 18 3, 19 3Be communicated with coaxially with upstream side passage portion 16, and towards the inner face that is located at the sliding eye 20 on the Carburetor body 10 opening toward each other, the upstream side aperture is regulated passage portion 18 3Regulate passage portion 19 with the downstream side aperture 3Internal diameter bigger than the internal diameter of upstream side passage portion 16 and downstream side passage portion 17.
This upstream side and downstream side aperture are regulated passage portion 18 3, 19 3, be to regulate passage portion 19 from the downstream side aperture with 3 grades of step drills that figure does not show 3To Carburetor body 10 bore a hole processing, form with upstream side path 16.The downstream side aperture is regulated passage portion 19 3Outer end opening portion by being pressed into spheroid 33 obturation.
According to the 3rd embodiment, except have with the same effect of the 2nd embodiment owing to two apertures can be regulated passage portion 18 3, 19 3Form simultaneously with upstream side passage portion 16, so can reduce manufacturing procedure.
Describe embodiments of the invention above in detail, but the present invention is not limited to the foregoing description, in claim record scope of invention, can does various design alterations.

Claims (4)

1. the starting fuel regulator of a Carburetor, it comprises sliding throttle valve (23), temperature-sensitive driving mechanism (25) and electric heater (26); Sliding throttle valve (23) is used for having regulated employs air suction way (15 1, 15 2, 15 3) opening area, this employs air suction way (15 1, 15 2, 15 3) connect the upper reaches end and the dirty end of the main air suction way (13) on the Carburetor body (10); Temperature-sensitive driving mechanism (25) makes sliding throttle valve (23) action according to the wax (50) of dress in the housing (46) because of the breathing of temperature variation, and this housing (46) is positioned at the fixed position of Carburetor body; Electric heater (26) can heat above-mentioned wax (50) and be connected with housing (46); It is characterized in that, on Carburetor body (10), be provided with the upstream side aperture and regulate passage portion (18 1, 18 2, 18 3), the downstream side aperture regulates passage portion (19 1, 19 2, 19 3) and make above-mentioned two apertures regulate passage portion (18 1, 18 2, 18 3, 19 1, 19 2, 19 3) relative to one another at the sliding eye (20) of inner side surface opening; Sliding throttle valve (23) is entrenched in slidably in this sliding eye (20) and regulates passage portion (18 with direct control two apertures 1, 19 1, 18 2, 19 2, 18 3, 19 3) the opening area towards the opening portion of sliding eye (20), the upstream side aperture is regulated passage portion (18 1, 18 2, 18 3) communicate and constituted with the upper reaches end of main air suction way (13) and employ air suction way (15 1, 15 2, 15 3) a part, the downstream side aperture is regulated passage portion (19 1, 19 2, 19 3) communicate and constituted with the dirty end of main air suction way (13) and employ air suction way (15 1, 15 2, 15 3) a part, the downstream side aperture is regulated passage portion (19 1, 19 2, 19 3) the bottom regulate passage portion (18 than upstream side aperture 1, 18 2, 18 3) the low height difference in bottom.
2. the starting fuel regulator of Carburetor as claimed in claim 1 is characterized in that, the downstream side aperture is regulated passage portion (19 1, 19 2, 19 3) and upstream side aperture passage portion (18 1, 18 2, 18 3) be to form like this: regulating passage portion (18 from the upstream side aperture 1) regulate passage portion (19 towards the downstream side aperture 1) direction extract direction out as core, form simultaneously when the cast form of Carburetor body (10) with the form of blowhole, perhaps the downstream side aperture after the above-mentioned cast form is regulated passage portion (19 2, 19 3) side bore a hole processing and form.
3. the starting fuel regulator of Carburetor as claimed in claim 2 is characterized in that, the stripping direction when above-mentioned core is extracted direction with Carburetor body (10) cast form out is parallel.
4. the starting fuel regulator of Carburetor as claimed in claim 2 is characterized in that, rises and employs air suction way (15 2, 15 3) the upstream side passage portion (16) that is communicated with main air suction way (13) upper reaches end by the upper reaches end, the downstream side passage portion (17) that dirty end is communicated with the dirty end of main air suction way (13), be communicated with the dirty end of upstream side passage portion (16) and regulate passage portion (18 towards the upstream side aperture of sliding eye (20) opening 2, 18 3), be communicated with the upper reaches end of downstream side passage portion (17) and regulate passage portion (19 towards the downstream side aperture of sliding eye (20) opening 2, 19 3) constitute; Regulate passage portion (18 with the upstream side aperture that perforation is processed to form 2, 18 3) and downstream side aperture adjusting passage portion (19 2, 19 3) internal diameter be configured to bigger than the internal diameter of upstream side passage portion (16) and downstream side passage portion (17).
CN97114686A 1996-07-17 1997-07-16 Starting fuel regulator for carburetor Expired - Fee Related CN1069739C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP187296/1996 1996-07-17
JP18729696A JP3619328B2 (en) 1996-07-17 1996-07-17 Method for manufacturing starter fuel adjustment device for carburetor
JP187296/96 1996-07-17

Publications (2)

Publication Number Publication Date
CN1172209A CN1172209A (en) 1998-02-04
CN1069739C true CN1069739C (en) 2001-08-15

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CN97114686A Expired - Fee Related CN1069739C (en) 1996-07-17 1997-07-16 Starting fuel regulator for carburetor

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JP (1) JP3619328B2 (en)
CN (1) CN1069739C (en)
FR (1) FR2751378B1 (en)
IT (1) IT1293456B1 (en)
TW (1) TW354355B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4049628B2 (en) 2002-07-05 2008-02-20 本田技研工業株式会社 Seal structure for direct-acting bi-starter
JP2014190184A (en) * 2013-03-26 2014-10-06 Keihin Corp Carburetor
CN114810431B (en) * 2022-05-26 2022-12-09 浙江星煜机电科技股份有限公司 Carburetor air door adjusting mechanism

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4518540A (en) * 1982-01-26 1985-05-21 Yamaha Hatsudoki Kabushika Kaisha Multi-fuel carburetor
JPS62159752A (en) * 1986-01-07 1987-07-15 Yamaha Motor Co Ltd Engine starting device

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Publication number Priority date Publication date Assignee Title
JPS5496631A (en) * 1978-01-13 1979-07-31 Yamaha Motor Co Ltd Controlling system for starter carburetter
JPS5554650A (en) * 1978-10-19 1980-04-22 Honda Motor Co Ltd Automatic adjustor of mixed gas for start of carburetor with starter
JPH0713501B2 (en) * 1986-06-30 1995-02-15 株式会社京浜精機製作所 Automatic starter for carburetor for outboard motor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4518540A (en) * 1982-01-26 1985-05-21 Yamaha Hatsudoki Kabushika Kaisha Multi-fuel carburetor
JPS62159752A (en) * 1986-01-07 1987-07-15 Yamaha Motor Co Ltd Engine starting device

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FR2751378A1 (en) 1998-01-23
JP3619328B2 (en) 2005-02-09
JPH1030501A (en) 1998-02-03
IT1293456B1 (en) 1999-03-01
FR2751378B1 (en) 1999-03-26
CN1172209A (en) 1998-02-04
TW354355B (en) 1999-03-11
ITTO970643A1 (en) 1999-01-15

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