CN101676544B - Carburetor - Google Patents

Abstract

The present invention provides a carburetor, comprising a main body (10) having a gas supply component (11) and a valve barrel (12); and a piston-shaped air throttle (18) inlaied in the valve barrel in a sliding-freely manner and used to open and close a gas supply passage (11a), a side face of the valve barrel is provided with a cleaning joint (8) in a projecting manner, the cleaning joint is connected with a cleaning conduit tube (7) which is used to accepting fuel divorced from a carbon tank (N) for evaporating fuel, a side face of the air throttle (18) is provided with a cleaning groove (40) used to communicate the cleaning joint and the gas supply passage, wherein the cleaning joint is arranged on a side face of the valve barrel in a projecting manner along a plane (P) orthogonal to an axis (X) of the gas supply passage, such that the cleaning groove is formed in the air throttle in a mode that the cleaning joint is communicated with a groove (32) opening toward the gas supply passage in front of the air throttle. Thus, it is possible to mix the fuel divorced from the carbon tank and mixed gas stably, and to connect the cleaning conduit tube and the cleaning joint easily.

Description

Carburetor

Technical field

The present invention relates to a kind of improvement of Carburetor, this Carburetor has: carburetor main body, it comprises inner air inlet body as gas-entered passageway, and from this air inlet body to a side-prominent valve cylinder; Closure with piston-like; It is flush-mounted in sliding freely in the valve cylinder and to gas-entered passageway and opens and closes; Outstanding (purge) joint of removing contamination that is provided with in the valve cylinder side; This joint of removing contamination is connected with the conduit of removing contamination, this conduit disengaging fuel channeling conduct of removing contamination to from the charcoal jar of taking in evaporated fuel, spinning off, and be provided with the Sediment trap that this joint of removing contamination is communicated with gas-entered passageway in the side of closure.

Background technique

In the past, that kind for example in the real public clear 53-45132 communique of Japan, put down in writing of this Carburetor was by known.

In existing said Carburetor, Sediment trap be formed at closure on the side in gas-entered passageway downstream side.In the Carburetor that so forms; The opening part that is opened on gas-entered passageway of Sediment trap is in the eddy current generation portion of the inlet stream direction rear side of closure; And change along with the aperture of closure owing to the eddy current at this position produces situation, therefore be difficult to realize be directed to the stability of mixing mutually from disengaging fuel in the charcoal jar and mixed gas the gas-entered passageway from Sediment trap.In addition; On the side in gas-entered passageway downstream side, form Sediment trap at closure; Therefore the joint of removing contamination that is communicated with above-mentioned Sediment trap has to give prominence to the side that is arranged at valve cylinder near the upper surface of air inlet body; Therefore when the conduit of removing contamination with the charcoal jar is connected with this joint of removing contamination, can receive the obstruction of air inlet body, it is maintainable and bad.

Summary of the invention

The present invention makes in view of said situation; Its purpose is to provide a kind of Carburetor; Make it possible to obtain to be directed to the stability that the disengaging fuel from the charcoal jar (canister) the gas-entered passageway mixes with mixed gas from Sediment trap, and being connected of can easily remove contamination conduit and the joint of removing contamination.

In order to reach above-mentioned purpose, of the present invention first is characterised in that Carburetor has: carburetor main body, it comprise inner as gas-entered passageway the air inlet body and from this air inlet body to a side-prominent valve cylinder; Closure with piston-like; It is flush-mounted in sliding freely in the valve cylinder and to gas-entered passageway and opens and closes; The outstanding joint of removing contamination that is provided with in the side of valve cylinder; This joint of removing contamination is connected with the conduit of removing contamination, this disengaging fuel that catheter guidance spins off from the charcoal jar that is used for taking in evaporated fuel of removing contamination, and be formed with the Sediment trap that this joint of removing contamination is communicated with gas-entered passageway in the closure side; The plane of said remove contamination joint edge and the orthogonal axe of gas-entered passageway is outstanding to be arranged on the side of valve cylinder, and said Sediment trap joint is formed on the closure with the mode that the groove that is opened on gas-entered passageway of closure front-end face is communicated with so that this is removed contamination.

In accordance with a first feature of the invention; When engine running; The disengaging fuel that from the charcoal jar, spins off is drawn in the groove of closure front-end face through the conduit of removing contamination, remove contamination joint and Sediment trap successively; And in this groove, spread, the therefore said disengaging fuel that has spread under closure all the time can with mix equably by the fast air inlet of flow velocity with from the mixed gas that the ejection fuel of main nozzle is generated, thereby can make the air fuel ratio of this mixed gas stable.

In addition; On the basis of first characteristic; Of the present invention second is characterised in that, as said Sediment trap, is formed with straight-line groove and undercut groove all the time with on the side of carburetor main body sliding contact at closure; The axis of said straight-line groove from the inner end of the said joint of removing contamination along closure extends to the gas-entered passageway side, and said undercut groove makes this straight-line groove be communicated with the central part of said groove.In addition, first side 35 in the embodiments of the invention of stating after the another side of said closure side corresponds respectively to and second side 36.

According to second characteristic of the present invention; The disengaging fuel that has passed through the straight-line groove of Sediment trap is directed to the position of more leaning on the central part of groove than undercut groove; Therefore can make to break away from fuel diffusion equably in whole groove, can make it more good with mixing of mixed gas.

And then; On the basis of first characteristic; The of the present invention the 3rd is characterised in that; The bottom land of said undercut groove forms and begins the inclined-plane that falls towards its center subordinate from the side of closure, and the idle bolt that on carburetor main body, has been screwed together, and this idle bolt is connected on this inclined-plane and to the idling aperture of closure with the mode of the action of can advancing and retreat and regulates.

According to the 3rd characteristic of the present invention; The bottom land (being the inclined-plane) that constitutes the undercut groove of a Sediment trap part follows the idle bolt association of its butt moving with the mode of moving advancing and retreat; Thereby the function that realization is regulated the idling aperture of closure; Therefore need not in closure, to form the inclined-plane that is exclusively used in idle, can realize the simplification of throttle valve structure.

And then; On the basis of first characteristic, the of the present invention the 4th is characterised in that, is provided with the locating slot of straight line shape all the time with on the another side of carburetor main body sliding contact at closure; This locating slot extends along its axis in the length range of closure; And on valve cylinder, be provided with positioning key, this positioning key engages with this locating slot in the switching sliding area of closure, thereby keeps said connected state of removing contamination between joint and the Sediment trap; Also be provided with the assist location key on the inlet side end of valve cylinder and on the position identical with the circumferential phase place of closure, this assist location key engages with said locating slot when closure is inserted in said inlet.

According to the 4th characteristic of the present invention; When inserting closure in the valve cylinder; Locating slot through making closure engages with the assist location key of valve cylinder; Thereby carry out the transition to the fastening state of locating slot and positioning key, the connected state between joint and the Sediment trap of can in the whole switching zone of closure, guaranteeing to remove contamination.Therefore, if in the position that locating slot does not engage with the assist location key closure is inserted in the valve cylinder, because front end and the assist location key butt of closure, thereby the prevention closure inserts in valve cylinder, can prevent closure mispluged into.

And then; On the basis of first characteristic; The of the present invention the 5th is characterised in that; The throttle lever that is used for the chock plate that the gas-entered passageway to the closure upper reaches opens and closes is supported on carburetor main body, and the choke linkage and the said joint of removing contamination that are fixed in this throttle lever outer end are disposed at opposition side across valve cylinder.

According to the 5th characteristic of the present invention; Joint and choke linkage are disposed at opposition side across valve cylinder each other owing to removing contamination; Therefore the conduit of removing contamination that can avoid being connected on the joint of removing contamination is interfered with the chock plate operating line that is connected on the choke linkage each other, makes their maintainability become good.

In addition, the of the present invention the 6th is characterised in that Carburetor has: carburetor main body, it comprise inner as gas-entered passageway the air inlet body and from this air inlet body to a side-prominent valve cylinder; Closure with piston-like; It is flush-mounted in sliding freely in the valve cylinder and to gas-entered passageway and opens and closes; The outstanding joint of removing contamination that is provided with in the side of valve cylinder; This joint of removing contamination is connected with the conduit of removing contamination, this disengaging fuel that catheter guidance spins off from the charcoal jar that is used for taking in evaporated fuel of removing contamination, and the outlet of removing contamination that is communicated with this joint of removing contamination is arranged on the closure with the mode that is opened on gas-entered passageway; In and on the opposed both sides of closure, be provided with first outlet and second of removing contamination that all is communicated with and remove contamination and export this a pair of outlet of removing contamination with the said joint of removing contamination across the axis of its axis and gas-entered passageway.In addition, said second Sediment trap corresponding to after the locating slot of the present invention 40 stated.

According to the 6th characteristic of the present invention; When engine running; The air-intake negative-pressure that in gas-entered passageway, is produced acts on and is opened on first of the closure lower end surface outlet and second of removing contamination and removes contamination and export; Therefore said air-intake negative-pressure is through shared acting in the charcoal jar with removing contamination piecing strength, thereby can effectively adsorbed fuel be spun off, can be effectively to the evaporated fuel processing of removing contamination.

And; Even closure when opening and closing around its rotational minute angle; Since first remove contamination outlet and second remove contamination export be disposed at closure on the both sides of the axis of its axis and gas-entered passageway; Therefore first remove contamination the side in exporting of outlet and second that removes contamination is displaced to the higher upstream side of air-intake negative-pressure of gas-entered passageway; And said first the opposing party that outlet and second removes contamination in the outlet that removes contamination is displaced to the lower downstream side of air-intake negative-pressure of gas-entered passageway, and is consequently, can be all the time constant with acting on first the remove contamination mean value maintenance of the air-intake negative-pressure that exports of outlet and second of removing contamination; Therefore can make the stability of characteristics of removing contamination of evaporated fuel, and the air fuel ratio of the mixed gas of supply engine is stablized.

And; On the basis of the 6th characteristic; The of the present invention the 7th is characterised in that, the said joint edge of removing contamination is arranged on the side of valve cylinder with the plane of the orthogonal axe of gas-entered passageway is outstanding, and first Sediment trap of this inner institute of joint opening of removing contamination is along on the side that axially is formed at this closure of closure; With the underpart of this first Sediment trap as said first the remove contamination outlet and be opened on the lower end surface in the face of gas-entered passageway of closure; On the other hand, it axially is formed with second Sediment trap in the upper edge, another side of closure, and this second Sediment trap is across the axis of closure and opposed with said first Sediment trap; And be communicated with this first Sediment trap, being removed contamination as said second in the underpart of this second Sediment trap exports and is opened on the lower end surface in the face of gas-entered passageway of closure.

According to the 7th characteristic of the present invention; On the mutual opposed side of closure and another side, form first Sediment trap and second Sediment trap that extend along the axis of closure, thereby can on closure, form said first outlet and second outlet of removing contamination of removing contamination simply.

And then on the basis of the 7th characteristic, the of the present invention the 8th is characterised in that, closure has the hollow portion that the end was opened wide and had in the upper-end surface, and said first Sediment trap and second Sediment trap are interconnected via this hollow portion.

According to the 8th characteristic of the present invention, via the hollow portion of closure first Sediment trap and locating slot are communicated with, thereby can obtain this connectivity structure simply.

And then on the basis of the 7th characteristic, the of the present invention the 9th is characterised in that, said first outlet and second of removing contamination is removed contamination outlet via perhaps circular-arc connectivity slot and being interconnected of the ring-type that on the outer circumferential face of closure, forms.

According to the 9th characteristic of the present invention, can not rely on the hollow portion of closure and be communicated with between first Sediment trap and the locating slot simply.

And then; On the basis of the 7th characteristic, the of the present invention the tenth is characterised in that, the bottom land of the said first Sediment trap underpart forms and begins the inclined-plane that falls towards its center subordinate from the side of closure; And the idle that on carburetor main body, has been screwed together bolt; This idle bolt is connected on this inclined-plane with the mode of the action of can advancing and retreat, and the idling aperture of closure is regulated, and; On said valve cylinder, be set with positioning key, this positioning key engages with said second Sediment trap to stop closure to rotate with slide relative mode freely in said second Sediment trap.

According to the tenth characteristic of the present invention, can be respectively with the bottom land of first Sediment trap as use the inclined-plane with idle bolt association moving idle, and with second Sediment trap as with the moving locating slot of positioning key association, so can realize the simplification of throttle valve structure.

Above-mentioned and other purposes of the present invention, characteristic and advantage are able to clearly through the explanation of the following preferred embodiment that is described in detail with reference to accompanying drawing.

Description of drawings

Fig. 1 is the synoptic diagram of fuel supply system with engine for two-wheel motor vehicle of the described Carburetor of the first embodiment of the present invention.

Fig. 2 is the amplification view along the 2-2 line of the Carburetor among Fig. 1.

Fig. 3 is the view along the arrow 3 of Fig. 2.

Fig. 4 is the amplification view of the 4 indications part of the Carburetor among Fig. 1.

Fig. 5 is a stereogram of observing the closure of above-mentioned Carburetor from the Sediment trap side.

Fig. 6 is a stereogram of observing this closure from the locating slot side.

Fig. 7 is the figure corresponding with Fig. 4 that the described Carburetor of the second embodiment of the present invention is shown.

Fig. 8 is a stereogram of observing the closure of this Carburetor from the first Sediment trap side.

Fig. 9 is the sectional elevation along the closure of the 9-9 line of Fig. 7.

Figure 10 is the figure corresponding with Fig. 4 that the described Carburetor of the third embodiment of the present invention is shown.

Figure 11 is a stereogram of observing the closure of this Carburetor from the first Sediment trap side.

Figure 12 is the negative pressure characteristic line chart of the joint of removing contamination that the second embodiment of the present invention and existing example are compared.

Embodiment

Below, based on accompanying drawing the preferred embodiments of the present invention are described.

At first, begin to describe from Fig. 1～first embodiment of the present invention shown in Figure 6.

In Fig. 1, import joint 1 at the fuel that is used to receive fuel of the Carburetor C that is connected with the suction port of the motor (not shown) of motor bike, be connected with fuel cock (cock) 2 extended fuel supply conduits 3 from the bottom of fuel tank T.Extend reinforced conduit 4 from the top of fuel tank T, this reinforced conduit 4 is connected on the end of charcoal jar N, thereby the evaporated fuel that will in fuel tank T, produce guides in charcoal jar N.Charcoal jar N is filled with fuel sorbents 5 such as active carbon in inside, on this charcoal jar N and the other end reinforced conduit 4 opposition sides, be provided with the vent 6 of charcoal jar N inside to atmosphere opening.Paid the conduit 7 of removing contamination in 4 minutes from reinforced conduit, this conduit 7 of removing contamination is connected on the joint 8 of removing contamination of Carburetor C.On the conduit 7 of removing contamination, clamped the known control valve 9 of removing contamination, this control valve 9 of removing contamination is closed when engine idling operation, and when predetermined low-speed turns round and even runs up, opens.

Then, with reference to Fig. 2～Fig. 6 said Carburetor C is elaborated.

Like Fig. 2～shown in Figure 4; The carburetor main body 10 of said Carburetor C by inside as the air inlet body 11 of gas-entered passageway 11a with constitute to the tab-like valve cylinder 12 that becomes in top from the length direction central part of this air inlet body 11, and on the lower surface of air inlet body 11, float chamber 13 is installed.This float chamber 13 receives via float-controlled valve 14 and has flow into said fuel and import fuel in the joint 1 until reaching certain level.In addition, in air inlet body 11, on the axis identical with valve cylinder 12, main nozzle 15 is installed, the lower end of this main nozzle 15 is immersed in the fuel in the float chamber 13, and open upper end is in gas-entered passageway 11a.

On the other hand, in valve cylinder 12, be embedded with the piston type closure 18 that gas-entered passageway 11a is opened and closed sliding freely, and the needle-valve 19 that is attached to the apicule of these closure 18 underparts is inserted in the said main nozzle 15.Screw togather in the upper end of valve cylinder 12 and to be connected with the lid 20 that the closure 18 that is used to close valve cylinder 12 inserts with inlet 12a; Compression is provided with the Returnning spring 21 that is made up of helical spring between this lid 20 and closure 18, and 21 pairs of closures 18 of this Returnning spring are to the closing direction application of force.

In closure 18, be connected with and connect the splicing ear 22a cover 20 throttle operation line 22; This throttle operation line 22 is drawn by the throttle grip of the steering tiller of not shown motor bike; Thereby make closure 18 to opening the direction action, the leading pipe 23 of this throttle operation line 22 is supported on the said lid 20.

In the gas-entered passageway 11a at closure 18 upper reaches, be equipped with butterfly chock plate 25.This chock plate 25 is fixed on the throttle lever 26 by screw 27, and this throttle lever 26 crosses gas-entered passageway 11a with horizontal attitude and rotation is supported in the air inlet body 11 freely, on the outside outstanding ends of air inlet body 11, is fixed with choke linkage 28 at throttle lever 26.On this choke linkage 28, be connected with the chock plate operating line (not shown) that is used for this choke linkage 28 of rotating operation.

As shown in Figure 4, on a side of valve cylinder 12, be formed with the first outstanding boss 30 of axis X plane orthogonal P of edge and gas-entered passageway 11a, in this first boss 30, be fixed with the outstanding said joint 8 of removing contamination of the above-mentioned plane P in same edge through mode such as being pressed into.This joint 8 of removing contamination is disposed at opposition side across valve cylinder 12 each other with said choke linkage 28.

According to Fig. 4～Fig. 6; In more detail piston type closure 18 is described; Closure 18 is formed with the groove 32 of the circle of the fuel ejiction opening that covers main nozzle 15 in the lower end surface of facing with gas-entered passageway 11a; And be formed with spring container 33 in the upper-end surface of this closure 18; This spring container 33 is darker than groove 32, and the bottom that is used to take in said Returnning spring 21, and utilizes partition wall 34 between said groove 32 and the spring container 33 to support the upper end portion of said needle-valve 19.

Closure 18 have against each other and all the time with two sides 35,36 of carburetor main body 10 sliding contacts, said side of removing contamination joint 8 sides is called first side 35, the side of its opposition side is called second side 36.

On first side 35 of closure 18, be formed with the Sediment trap 40 that the joint 8 of removing contamination is communicated with said groove 32.This Sediment trap 40 is made up of straight-line groove 40a and undercut groove 40b, and the axis Y of said straight-line groove 40a from the inner end of the joint 8 of removing contamination along closure 18 extends to gas-entered passageway 11a side, and said undercut groove 40b makes this straight-line groove 40a be communicated with the central part of said groove 32.

At this moment; The bottom land of undercut groove 40b forms from the side of closure 18 and begins towards the inclined-plane 41 that its center subordinate falls; The idle bolt 42 of cone shape front end 42a and this inclined-plane 41 butts and second boss 31 are screwed together; This second boss 31 and first boss 30 are outstanding abreast to be arranged on the side of valve cylinder 12, through making this idle bolt 42 with respect to inclined-plane 41 advance and retreat actions, can regulate the idling aperture of closure 18.The large-diameter portion of the front end 42a that enters into undercut groove 40b of idle bolt 42 forms enough littler than the groove width of undercut groove 40b, in order to avoid this front end 42a stops up undercut groove 40b.

As shown in Figure 4; On second side 36 of closure 18, be provided with the locating slot 43 of straight line shape; This locating slot 43 extends along its axis Y in the length range of this closure 18; And on valve cylinder 12, be set with positioning key 44, this positioning key 44 engages with this locating slot 43 in the switching sliding area of closure 18, thereby keeps said connected state of removing contamination between joint 8 and the Sediment trap 40.Have, the position identical with the circumferential phase place of closure 18 on the inlet 12a of valve cylinder 12 side end is set with assist location key 45 again, and this assist location key 45 engages with said locating slot 43 when closure 18 is inserted in said inlet 12a.

As Fig. 4 and Fig. 6 show clearly; Locating slot 43 is made up of no kerve 43a and band kerve 43b; The perisporium integral body of said no kerve 43a through-going recess 32 and the perisporium bottom of spring container 33 also are cut in the partition wall 34 with being incision-like; The mode that said band kerve 43b is communicated with the upper end portion with this no kerve 43a is formed at the perisporium top of spring container 33, and the diapire of band kerve 43b is with symbol 46 expressions.This diapire 46 becomes one with closure 18, therefore can prevent to make because of no kerve 43a the reduction in strength of closure 18 as far as possible.

Be formed with the hole, big footpath 47 that the splicing ear 22a that can supply said throttle operation line 22 passes through on the top of no kerve 43a.In addition, on partition wall 34, be provided with terminal hole 48, this terminal hole 48 is communicated with no kerve 43a and is opened on groove 32, and can be chimeric with said splicing ear 22a.

Like this; When throttle operation line 22 is connected with closure 18; Before inserting closure 18 in the valve cylinder 12; After making splicing ear 22a pass hole, big footpath 47, throttle operation line 22 is led to the outside and the below of closure 18 with the part of throttle operation line 22, then from 33 inboards, spring container; The throttle operation line 22 of drawing through making passes no kerve 43a and gets back in the closure 18 and mention, thereby splicing ear 22a is chimeric from the terminal hole 48 of groove 32 sides and partition wall 34.

Then, the effect to this first embodiment describes.

Under the state of engine stoping operation, by the heating such as radiation heat of the sun, perhaps by outside air cooling, thereby during the variation in pressure in the fuel tank T, the upper space in the fuel tank T is taken a breath through the charcoal jar N with vent 6 at fuel tank T.At this moment, the evaporated fuel that in fuel tank T, is produced is transported among the charcoal jar N with the gas that swaps out, and 5 pairs of these evaporated fuels of fuel sorbent in the charcoal jar N adsorb to prevent that it is discharged in the atmosphere.

When engine running; In Carburetor C; Closure 18 is raised from idling aperture position, and when motor becomes predetermined low-speed running and even runs up state, thereby the control valve 9 of removing contamination is opened and made conduit 7 conductings of removing contamination; Therefore the air-intake negative-pressure that in gas-entered passageway 11a, is produced acts among the charcoal jar N via Sediment trap 40, remove contamination joint 8 and the conduit 7 of removing contamination, and adsorbed fuel is broken away from from fuel sorbent 5.This breaks away from fuel under above-mentioned air-intake negative-pressure effect, is drawn in the groove 32 of closure 18 lower end surfaces, and this groove 32 in, spreads through the conduit 7 of removing contamination, remove contamination joint 8 and Sediment trap 40 successively.Particularly passed through the disengaging fuel of the straight-line groove 40a of Sediment trap 40, therefore the central part by undercut groove 40b is directed to groove 32 can make to break away from fuel diffusion equably in whole groove 32.Therefore, the disengaging fuel that in groove 32, has spread under closure 18 all the time can with mix equably by the fast air inlet of flow velocity with from the mixed gas that the ejection fuel of main nozzle 15 is generated.Consequently, because the air fuel ratio of mixed gas is stable, therefore can make the combustion regime of this mixed gas in motor become good.

In addition; Inclined-plane 41 as the bottom land of above-mentioned undercut groove 40b is moving with idle bolt 42 associations of its butt with the mode with the action of can advancing and retreat; Play the function that the idling aperture of closure 18 is regulated; Therefore in closure 18, need not to form the inclined-plane that is exclusively used in idle, can realize the designs simplification of closure 18.

Have, therefore the joint 8 of removing contamination laterally projecting from valve cylinder 12 along air inlet body 11 can easily be connected the conduit 7 of removing contamination with this joint 8 of removing contamination, and can not receive air inlet body 11 obstructions, good thereby maintainability becomes again.

In addition; The joint 8 of removing contamination is disposed at opposition side across valve cylinder 12 each other with choke linkage 28; Therefore can avoid being connected the conduit 7 of removing contamination of removing contamination on the joint 8 and interfere each other with the chock plate operating line (not shown) that is connected on the choke linkage 28, good thereby their maintainability becomes.

In the assembling procedure of Carburetor C, when in valve cylinder 12, inserting closure 18, be that the underpart begins to the inlet 12a of valve cylinder 12, to insert from the front end of closure 18.At this moment, the locating slot 43 of closure 18 is engaged with the assist location key 45 of valve cylinder 12.If insert closure 18 in the valve cylinder 12 position in that locating slot 43 does not engage with assist location key 45; Because the underpart and assist location key 45 butts of closure 18; Thereby stop closure 18 to valve cylinder 12 in, to insert, thus can prevent closure 18 quilts mispluged into.

When making locating slot 43 be engaged on the assist location key 45; With the words in the closure 18 insertion valve cylinders 12; Locating slot 43 with fastening state that assist location key 45 engages under enter into the fastening state that engages with positioning key 44; When further deeply inserting, locating slot 43 leaves assist location key 45, becomes the fastening state that only engages with positioning key 44.Said locating slot 43 maintains in the whole switching zone of closure 18 with the fastening state of positioning key 44, thus can and the aperture size of closure 18 irrespectively keep said connected state of removing contamination between joint 8 and the Sediment trap 40.

Then, Fig. 7～second embodiment of the present invention shown in Figure 9 is described.

In this second embodiment, closure 18 across the axis X of the axis Y of closure 18 and gas-entered passageway 11a and on the opposed both sides, be provided with first Sediment trap 40 and second Sediment trap, 43 these a pair of Sediment traps of being communicated with the joint 8 of removing contamination.In this case, the Sediment trap among said first embodiment 40 as first Sediment trap 40, is used as second Sediment trap 43 with the locating slot among said first embodiment 43.

That is, second Sediment trap 43 is communicated with said first Sediment trap 40 via running through the through hole 49 that is arranged on first Sediment trap, 40 bottom lands and the spring container 33 (being hollow portion 33) of closure 18.Like this, first Sediment trap 40 and second Sediment trap 43 are communicated with the said joint 8 of removing contamination jointly.Remove contamination outlet 43c as second and be opened on the groove 32 of closure 18 in the underpart of second Sediment trap 43.Therefore, first remove contamination the outlet 40b and second remove contamination the outlet 43c dispose (with reference to Fig. 9) symmetrically across the axis Y of closure 18 and the axis X of gas-entered passageway 11a.

In addition; First Sediment trap 40 that kind shown in dot and dash line 40a ' (with reference to Fig. 7 and Fig. 8) is extended and the opening in the upper-end surface of closure 18 to the top; Need not to be provided with said through hole 49, just can connection between first Sediment trap 40 and second Sediment trap 43 be got up via the hollow portion 33 of closure 18.In a word, through with the hollow portion 33 of closure 18 with being communicated with between first Sediment trap 40 and second Sediment trap 43, thereby can form this connectivity structure simply.

Other structures are identical with said first embodiment, therefore in Fig. 7～Fig. 9 to being marked with identical reference symbol with the corresponding part of first embodiment, and omission repeat specification.In addition, Fig. 1～Fig. 3 directly uses in this second embodiment.

Then, the effect to second embodiment describes.

Under the state of engine stoping operation, by the heating such as radiation heat of the sun, perhaps by outside air cooling, thereby during the variation in pressure in the fuel tank T, the upper space in the fuel tank T is taken a breath through the charcoal jar N with vent 6 at fuel tank T.At this moment, the evaporated fuel that in fuel pot T, is produced is transported among the charcoal jar N with the gas that swaps out, and 5 pairs of these evaporated fuels of fuel sorbent in the charcoal jar N adsorb to prevent that it is discharged in the atmosphere.

When engine running; In Carburetor C; Closure 18 is raised from idling aperture position, and when motor becomes predetermined low-speed running and even runs up state, thereby the control valve 9 of removing contamination is opened and made conduit 7 conductings of removing contamination; Therefore the air-intake negative-pressure that in gas-entered passageway 11a, is produced acts on and is opened on first of the closure 18 lower end surfaces outlet 40b and second that removes contamination and removes contamination on the outlet 43c; Therefore this air-intake negative-pressure acts on the joint 8 of removing contamination through first Sediment trap 40 and second Sediment trap 43 powerfully, and then acts among the charcoal jar N through removing contamination conduit 7 powerfully, thereby can effectively adsorbed fuel be spun off from fuel sorbent 5.This breaks away from fuel under above-mentioned air-intake negative-pressure effect; Successively through the conduit 7 of removing contamination, remove contamination joint 8 and first Sediment trap 40 and second Sediment trap 43; And be drawn to the groove 32 of closure 18 lower end surfaces, and this groove 32 in, spread from first outlet 40b and the second outlet 43c that removes contamination that removes contamination.Then, in groove 32 the disengaging fuel of diffusion under closure 18 all the time can with mix equably by the fast air inlet of flow velocity with from the mixed gas that the ejection fuel of main nozzle 15 is generated.

Figure 12 illustrates the figure of test result of characteristic that expression acts on the air-intake negative-pressure of the joint 8 of removing contamination; The A line shows the characteristic of the existing Carburetor that only is provided with the outlet of removing contamination; The B line shows the characteristic of the Carburetor of the present invention that is provided with a pair of remove contamination outlet 40b, 43c; Can be clear and definite by two characteristics; In Carburetor of the present invention, can keep the air-intake negative-pressure that acts on the joint 8 of removing contamination higher than existing Carburetor always, be drawn among the gas-entered passageway 11a thereby can in low vehicle speed range, will break away from fuel therewith together.

In addition; At second Sediment trap 43 of closure 18 be fixedly set between the engagement portion that the positioning key 44 in the valve cylinder 12 fastens and have glade plane space; Therefore closure 18 (when opening and closing gas-entered passageway 11a) when going up and down has rotated minute angle around its axis Y; Yet it is as shown in Figure 9; First remove contamination outlet 40b and second remove contamination outlet 43c be disposed at closure 18 on the both sides of the axis X of its axis Y and gas-entered passageway 11a, therefore when closure 18 carries out above-mentioned rotation, the first outlet 40b and second that removes contamination removes contamination and exports the higher upstream side of air-intake negative-pressure that a side among the 43c is displaced to gas-entered passageway 11a; And said first outlet 40b and the second outlet the opposing party among the 43c that removes contamination that removes contamination is displaced to the lower downstream side of air-intake negative-pressure of gas-entered passageway 11a; Consequently, can be all the time keep constant, therefore can make the stability of characteristics of removing contamination of evaporated fuel acting on first the remove contamination mean value of air-intake negative-pressure of outlet 43c of outlet 40b and second of removing contamination; Make the air fuel ratio of said mixed gas stable, thereby help the raising of the output performance of motor.

In addition; Moving as first the remove contamination inclined-plane 41 of bottom land of outlet 40b (promptly as undercut groove 40b) with mode butt idle bolt 42 associations on it with the action of can advancing and retreat; Played the function that the idling aperture of closure 18 is regulated; Therefore in closure 18, need not to form the special-purpose inclined-plane of idle, can realize the designs simplification of closure 18.

In addition, second Sediment trap 43 that engages with positioning key 44 is also used as evaporated fuel is directed to second Sediment trap among the gas-entered passageway 11a, therefore helps the designs simplification of closure 18.

And then, because therefore joint 8 laterally projecting from valve cylinder 12 along air inlet body 11 of removing contamination can easily be connected the conduit 7 of removing contamination with this joint 8 of removing contamination, and can not receive air inlet body 11 obstructions, good thereby maintainability becomes.

In addition; The joint 8 of removing contamination is disposed at opposition side across valve cylinder 12 each other with choke linkage 28; Therefore can avoid being connected the conduit 7 of removing contamination of removing contamination on the joint 8 and interfere each other with the chock plate operating line (not shown) that is connected on the choke linkage 28, good thereby their maintainability becomes.

In the assembling procedure of Carburetor C, when in valve cylinder 12, inserting closure 18, be that the underpart begins to the inlet 12a of valve cylinder 12, to insert from the front end of closure 18.At this moment, second Sediment trap 43 of closure 18 is engaged with the assist location key 45 of valve cylinder 12.If insert closure 18 in the valve cylinder 12 position in that second Sediment trap 43 does not engage with assist location key 45; Because the underpart and assist location key 45 butts of closure 18; Thereby stop closure 18 to valve cylinder 12 in, to insert, thus can prevent closure 18 quilts mispluged into.

When making second Sediment trap 43 be engaged on the assist location key 45; With the words in the closure 18 insertion valve cylinders 12; Second Sediment trap 43 with fastening state that assist location key 45 engages under enter into the fastening state that engages with positioning key 44; When further deeply inserting, second Sediment trap 43 leaves assist location key 45, becomes the fastening state that only engages with positioning key 44.Said second Sediment trap 43 maintains in the whole switching zone of closure 18 with the fastening state of positioning key 44, thus can and the aperture size of closure 18 irrespectively keep said connected state of removing contamination between the joint 8 and first Sediment trap 40.

Then, the Figure 10 and the third embodiment of the present invention shown in Figure 11 are described.

In the 3rd embodiment; Be communicated with ring-type or circular-arc connectivity slot 50 between first Sediment trap 40 and second Sediment trap 43 being formed with on the outer circumferential face of positioning key 44 downsides of closure 18; Except the hollow portion 33 that does not rely on closure 18 is communicated with between first Sediment trap 40 and second Sediment trap 43 this point; Identical with said second embodiment's structure; In Figure 10 and Figure 11, to being marked with identical reference symbol, and omit repeat specification with the corresponding part of said second embodiment.

Also can obtain the connectivity structure between first Sediment trap 40 and second Sediment trap 43 simply through the 3rd embodiment.

The present invention is not limited to the foregoing description, can in the scope that does not break away from its purport, carry out various design alterations.For example, throttle operation line 22 is connected in the Carburetor of the form in the closure 18, can whole second Sediment trap 43 be formed the band kerve at the no kerve 43a of the locating slot that does not rely on first embodiment 43 or second embodiment's second Sediment trap 43.In this case; Being communicated with between first Sediment trap 40 and second Sediment trap 43 can effectively utilize the 3rd embodiment; Yet when using second embodiment, the lower opening that can be arranged on positioning key 44 at the bottom land of second Sediment trap 43 is in the through hole of the hollow portion 33 of closure 18.

Claims (10)

1. Carburetor, this Carburetor has:

Carburetor main body (10), it comprise inner as gas-entered passageway (11a) air inlet body (11) and from this air inlet body (11) to a side-prominent valve cylinder (12); With

The closure of piston-like (18), it is flush-mounted in sliding freely in the valve cylinder (12) and to gas-entered passageway (11a) and opens and closes,

The outstanding joint of removing contamination (8) that is provided with in the side of valve cylinder (12); This joint of removing contamination (8) is connected with the conduit of removing contamination (7); The disengaging fuel that the guiding of this conduit of removing contamination (7) spins off from the charcoal jar (N) that is used for taking in evaporated fuel; And be formed with the Sediment trap (40) that this joint of removing contamination (8) is communicated with gas-entered passageway (11a) in closure (18) side, this Carburetor is characterised in that

Axis (X) plane orthogonal (P) of the said joint of removing contamination (8) edge and gas-entered passageway (11a) is outstanding to be arranged on the side of valve cylinder (12), and said Sediment trap (40) joint (8) is formed on the closure (18) with the mode that the groove that is opened on gas-entered passageway (11a) (32) of closure (18) front-end face is communicated with so that this is removed contamination.

2. Carburetor according to claim 1 is characterized in that,

As said Sediment trap (40); All the time with on the side (35) of carburetor main body (10) sliding contact be formed with straight-line groove (40a) and undercut groove (40b) at closure (18); The axis (Y) of said straight-line groove (40a) from the inner end of the said joint of removing contamination (8) along closure (18) extends to gas-entered passageway (11a) side, and said undercut groove (40b) makes this straight-line groove (40a) be communicated with the central part of said groove (32).

3. Carburetor according to claim 2 is characterized in that,

The bottom land of said undercut groove (40b) forms from the side of closure (18) and begins towards the inclined-plane (41) that its center subordinate falls; And the idle bolt (42) that on carburetor main body (10), has been screwed together, the mode that this idle bolt (42) moves advancing and retreat is connected to this inclined-plane (41) and goes up and the idling aperture of closure (18) is regulated.

4. Carburetor according to claim 1 is characterized in that,

All the time with on the another side (36) of carburetor main body (10) sliding contact be provided with the locating slot (43) of straight line shape at closure (18); This locating slot (43) extends along its axis (Y) in the length range of closure (18); And on valve cylinder (12), be provided with positioning key (44); This positioning key (44) engages with this locating slot (43) in the switching sliding area of closure (18); Thereby keep the connected state between said joint of removing contamination (8) and the Sediment trap (40); On inlet (12a) side end of valve cylinder (12) and on the position identical with the circumferential phase place of closure (18), also be provided with assist location key (45), this assist location key (45) engages with said locating slot (43) when closure (18) is inserted in said inlet (12a).

5. Carburetor according to claim 1 is characterized in that,

The throttle lever (26) that is used for the chock plate (25) that the gas-entered passageway (11a) to closure (18) upper reaches opens and closes is supported on carburetor main body (10), and the choke linkage (28) that is fixed in this throttle lever (26) outer end is disposed at opposition side with the said joint of removing contamination (8) across valve cylinder (12).

6. according to claim 2 or 3 described Carburetors, it is characterized in that,

Said undercut groove (40b) constitutes and to be communicated with the said joint of removing contamination (8) and to be opened on first of said gas-entered passageway (11a) outlet of removing contamination,

In and on the opposed both sides of closure (18) across the axis (X) of its axis (Y) and gas-entered passageway (11a), be provided with this first remove contamination outlet be communicated with the said joint of removing contamination (8) and be opened on gas-entered passageway (11a) with the said first second different outlet (43c) of removing contamination of outlet of removing contamination.

7. Carburetor according to claim 6 is characterized in that,

The said Sediment trap (40) of this inner institute of joint of removing contamination (8) opening is along on the said side (35) that axially is formed at this closure (18) of closure (18); With the underpart of this Sediment trap (40) as said undercut groove (40b) and be opened on the lower end surface in the face of gas-entered passageway (11a) of closure (18)

On the other hand; It axially is formed with another Sediment trap (43) in the upper edge, another side (36) of closure (18); This another Sediment trap (43) is across the axis (Y) of closure (18) and opposed with said Sediment trap (40); And be communicated with this Sediment trap (40), with the underpart of this another Sediment trap (43) as said second the remove contamination outlet (43c) and be opened on the lower end surface in the face of gas-entered passageway (11a) of closure (18).

8. Carburetor according to claim 7 is characterized in that,

Closure (18) has the hollow portion (33) that the end was opened wide and had in the upper-end surface, and said Sediment trap (40) and said another Sediment trap (43) are interconnected via this hollow portion (33).

9. Carburetor according to claim 8 is characterized in that,

Said first outlet (40b) and second outlet (43c) of removing contamination of removing contamination is interconnected via the ring-type that on the outer circumferential face of closure (18), forms or circular-arc connectivity slot (50).

10. Carburetor according to claim 9 is characterized in that,

The bottom land of said Sediment trap (40) underpart forms from the side of closure (18) and begins towards the inclined-plane (41) that its center subordinate falls; And idle bolt (42) has been screwed together on carburetor main body (10); This idle bolt (42) is connected on this inclined-plane (41) with the mode of the action of can advancing and retreat; And the idling aperture of closure (18) regulated; And, on said valve cylinder (12), being set with positioning key (44), this positioning key (44) engages with said another Sediment trap (43) to stop closure (18) to rotate with slide relative mode freely in said another Sediment trap (43).

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