JPH02173346A - Carbureter assembly - Google Patents

Abstract

PURPOSE: To simplify assembling and inspection of equipment by fixing a fuel bowl on a body formed by extrusion with a through passage and providing a cylindrical venturi member in the through passage to direct the fuel in the fuel bowl to the venturi member. CONSTITUTION: A body 12 having a cross-section extending in the same shape along an axis by extrusion is formed by aluminum and the like, and a fuel bowl 14 is molded of plastic material. The fuel bowl 14 is fixed on the body 12 by a spring clip 16. The spring clip 16 surrounds the fuel bowl 14 completely. A pair of curved portions 17 engaging with a flat portion 15 of the body 12 is formed. A nozzle tube 18 extends from the fuel bowl 14. The tube passes through a nozzle hole 21 of the body 12 and is inserted in the through bore 20. A venturi insert 22 having a venturi slot 24 and a throttle valve 38 are also arranged in the through bore 20.

Description

[Detailed Description of the Invention] [Object of the Invention] <Industrial Application Field> The present invention relates to a carburetor for an internal combustion engine, and in particular to a carburetor for an internal combustion engine, such as one used in a lawn mower, snow blower, generator, pump, etc. Concerning a carburetor for a small internal combustion engine.

BACKGROUND OF THE INVENTION Conventional carburetors are generally formed by casting, for example aluminum or zinc, and have a die-cast body to which a fuel bowl assembly is secured by threaded fittings. A disadvantage of this conventional carburetor construction is the high manufacturing cost of the die-cast aluminum body. Costs are incurred not only in casting the body, but also in machining the cast body to provide the many passages and holes. Another disadvantage of such traditional die-cast aluminum bodies is that die-cast aluminum is often porous, so such die-cast aluminum bodies must be impregnated with special sealing materials. It is. Other die casting materials that are less porous than aluminum have also been used, such as zinc.

However, zinc is heavier and more expensive than aluminum, so zinc is particularly useful in small, hand-held or easily operated equipment such as leaf blowers, lightweight snow blowers, lawn mowers, etc. It is not a suitable material for internal combustion engines because weight reduction is important.

The fuel bowl of conventional carburetor assemblies is typically manufactured by stamping iron or aluminum.

Additionally, completely molded plastic vaporizers have been used in the past to reduce machining and to reduce the overall number of separate components required for the vaporizer. By manufacturing the entire vaporizer from plastic material, many parts that would normally be machined are molded at the same time. However, the example is specifically for lengths north of 6.35 mm (0,250 inches) or more.
It is difficult to mold certain orifices and other features that must maintain tight required tolerances, such as 0.1 inch).

Two items that are particularly difficult to mold into plastic carburetors are the throttle bore and throttle shaft bore. Both of these bores must maintain very tight tolerances and it is important that they are aligned within the carburetor body.

Particularly in full progression carburetors, a precise throttle bore is necessary for good performance of the carburetor. Even if tight tolerances can be maintained during the plastic molding process, over time, after the plastic structure is subjected to stress due to thermal cycling and/or loads, the plastic material has a tendency to deform due to plastic creep, and thus This will exceed the tolerance range. Attempts have been made to circumvent this problem by removing features from the carburetor, such as idle systems, which limit performance and eliminate the need for precise bores.

Some plastic carburetor constructions machine the throttle bore, throttle shaft bore, and idle progression hole into the aluminum portion of the carburetor to ensure close tolerances. Additionally, high-grade glass, reinforced plastic, or mineral-filled plastic materials have been used to improve the performance of molded plastic vaporizers. However, such filler materials make drilling and machining of plastic vaporizers very difficult. Moreover, the price of high-grade plastic materials is comparable to that of aluminum.

Another problem that traditional plastic vaporizers have is that their performance in plastic fuels is limited by contact with gasoline, gasoline/alcohol mixtures, and especially when gasoline decomposes to produce acids and peroxides. There are some things that deteriorate due to this.

Another problem with traditional carburetors is that they usually have a large number of gaskets and
Assembly costs included rings, threaded parts, press-fit elements, etc. Yet another important problem is the difficulty of servicing carburetors. Traditional carburetors typically require complete disassembly from the engine for servicing. In order to reassemble the carburetor to the engine, all the linkages had to be reconnected and readjusted, which took a lot of time.

<Problems to be Solved by the Invention> Therefore, an object of the present invention is to provide a carburetor for a small internal combustion engine that is low in cost, has excellent performance, is easy to assemble, and is easy to inspect and maintain. be.

SUMMARY OF THE INVENTION According to one form, a carburetor assembly of the present invention includes an extruded aluminum body, a molded venturi member inserted into the body, and a molded plastic fuel member. a bowl and a spring clip retaining the fuel bowl to the body.

A carburetor assembly according to the present invention has a body formed of extruded aluminum and having a throughbore.

A molded plastic venturi member is inserted within the throughbore and grooves formed in its outer surface provide a passageway for fluid flow therethrough in the body.

The amount of machining required for the extruded body is minimized.

The fuel bowl is molded of plastic material and is provided with locating studs to securely position it in the body. A spring clip secures the fuel bowl to the body. A gasket is inserted between the fuel bowl and the body to form a suitable seal. A molded plastic nozzle is received within a well molded into the fuel bowl. The nozzle extends from the fuel bowl and passes through a hole in the aluminum body and another hole in the venturi member, thereby positioning the venturi member. The fuel bowl further includes a fuel inlet and, in some embodiments, an idle mix adjustment screw and a main mix adjustment screw. In another embodiment, the fuel bowl includes a primer valve (bu I
A molded primer housing can be provided to which b) is attached.

According to one form of the present invention, a carburetor assembly includes an extruded body with a through passage having an air intake. A fuel bowl is secured to the body and means are provided for introducing fuel from the fuel bowl into the through passage.

According to another aspect of the invention, a vaporizer assembly is comprised of an extruded body having a passageway through which air can be introduced. A venturi member is mounted within the passageway.

The fuel bowl is fixed to the body. A nozzle is provided for introducing fuel from the fuel bowl into the venturi member.

According to yet another aspect of the invention, a carburetor assembly includes a body having a passageway therethrough. A fuel bowl assembly is secured to the body by resilient clip means. A tube is provided for introducing fuel from the fuel bowl assembly into the through passage.

The above-mentioned and other features and objects of the invention, as well as the means for realizing them, can be easily understood from the embodiments described in detail below with reference to the accompanying drawings.

<Embodiments> The present invention will be described in detail with regard to specific embodiments with reference to the accompanying drawings below. In addition, corresponding parts in each accompanying drawing are indicated with the same reference numerals.

1 and 2, a carburetor assembly 10 having a body 12 is shown. The body 12 is extruded and thus the entire shape of the body 12 extends axially uniformly with respect to an axis extending from right to left as shown in FIG. The body 12 is provided with several machined bores, as described below, which can be machined by automated equipment if desired. Since the body 12 is extruded, the entire shape of the body 12 extends uniformly along the axial direction, so machining and handling are relatively easy. Another advantage of using an extruded aluminum body 12 is that extruded aluminum products are not porous like die cast aluminum products, and the extruded body cannot be impregnated as is the case with traditional die cast aluminum carburetor bodies. There is no need to seal it. Since the material of the body 12 is aluminum, it is lightweight as required for small engine carburetors.

The illustrated embodiment of the fuel bowl 1-4 is formed from molded plastic material. Because the fuel bowl 14 of the present invention is formed from mineral-filled polyester, it has good chemical resistance to gasoline and its byproducts;
It also shows good stability. However, the fuel bowl 14 can be made of other plastic materials, cast metal, or the like, if desired. The fuel bowl] 4 is fixed to the body 12 by a spring clip 16. The spring clip 16 shown in FIGS. 6 and 8 is resilient and made of heat treated spring steel or piano wire. Thus, the spring clip 16 can be stamped or formed and then heat treated. A spring clip 16 completely surrounds the fuel bowl 14 and engages within a flat portion 15 of the extruded aluminum body 12 or a hole provided therein as best shown in FIGS. 1 and 6. It has a pair of curved parts 1.7. 1st
, the embodiment of the spring clip 1-6 shown in FIGS.
The protrusion 1 of the fuel bowl 14 is composed of a spring phase line.
It has a lower part 16a that engages with the groove 19a of No.9. In another embodiment, the spring clip 16 can be a flat shape made of stamped steel. The gas get 1-3 connects the flat part 15 of the body 12 and the plastic fuel bowl 14.
, thereby sealing the fuel bowl 14 from the body 1-2.

As shown in FIG.
The nozzle hole 21 of the carburetor body 12 is inserted into the through bore 20 of the carburetor body 12 . The nozzle pipe 18 has the function of introducing fuel from the fuel bowl 14 into a through bore 20 which mixes it with air and sends it into the cylinders of the engine, as will be described later. As best shown in FIGS. 2 and 7, through-bore 2
A venturi insertion portion 22 is arranged inside the 0. Although the venturi insert 22 is formed of a molded plastic material in this embodiment, it may be made of aluminum castings, machined parts, or the like. The venturi insertion part shrine 22 includes a venturi throat 24 and a nozzle opening 2.
6. An annular channel or groove 28 in sliding contact with its outer circumferential surface
, and an axial slot or groove 30 as shown in FIG. A venturi insert 22 is positioned within throughbore 20 by nozzle tube 18 extending through nozzle opening 26 . Furthermore, by providing an annular channel 28 and a connecting axial slot 30, air can be introduced from the throughbore 20, through the slot 30, through the annular channel 28, and from the passage 31 of the flat 15 into the passage 69 of the fuel bowl]4. A continuous passageway is formed in the throughbore 20 for the purpose of this. By molding the annular channel 28 and the axial throwers 1-30 into the venturi member 22, the machining step of creating specific passageways in the carburetor is eliminated.

This reduces costs and also provides the flexibility to use different sized venturi members in the same sized body 12, reducing inventory.

As best shown in FIG.
has an outwardly tapered portion 32 at its rear end. This tapered portion 32 has an outer diameter that is slightly larger than the diameter of the main portion of the venturi insert 22 . This slightly larger outer diameter allows the tapered portion 32 to seal the venturi insert 22 against the wall of the throughbore 20, completely eliminating leakage from around the venturi insert 22.

As shown in FIGS. 1 and 2, a throttle shaft bore is provided for receiving a throttle shaft 36 having a throttle plate 38 secured thereto by a fitting 39 for controlling fluid flow through the throughbore 20 in a conventional manner. ing. By controlling the rotation of the throttle shirt 36, more or less fuel-air mixture is drawn into the engine through the through-bore 20. Further, a dust seal washer 40 is provided around the throttle shaft 36. A speed screw assembly 37 is attached to the throttle shaft 36 by which the settings of the throttle shaft 36 can be adjusted.

As shown in FIG. 3, the body 12 includes an additional passage 4.
2, 44, 46 are machined. Plug 48 is then inserted into the end of passage 46 and restriction 50 is inserted into passage 42. Restriction 50 cooperates with the idle system to restrict air entering the idle system. The fuel well is vented via passage 31, channel 28 and passages 46,42.

As shown in FIG. 8, the body 12 is provided with a bore 45. As shown in FIG. This bore 45 is closed by a welfare lug and is connected to passageway 44 as shown in FIGS.
Air is supplied to 4. The carburetor according to the invention may be provided with a primer consisting of a remote primer valve connected to the fuel bowl of the carburetor by a tube not shown in a known manner. The carburetor can be manufactured with an additional priming system or a choke system, and if the carburetor has a priming system, the choke system can be eliminated from the carburetor.

With a mixed screw system, there is no need to provide orifice 84. The same carburetor body 12 and fuel bowl 14 can be used to accommodate both types of systems.

When the primer valve is pressed, air flows into the fuel bowl 1.
4 to pressurize the fuel bowl. When the fuel bowl 14 is pressurized, the valve ball 64, which normally rests on the stopper 65, is "pushed in three directions" and comes into contact with the valve seat 67.
As a result, the positive pressure inside the fuel bowl 14 caused by the pressing of the primer valve (not shown) is transferred to the vent 62.
Prevent escape through.

A well 66 is formed by a wall 68 and is vented by a passage 69 connected to the air passage 31 . A compression spring 70 is placed at the bottom of the well 66 and is attached to the nozzle tube 1.
8 upwards and its shoulder 72 is the gasket 13.
a nozzle tube 18 that engages the nozzle tube 18 to thereby seal the nozzle tube 18 to the body 12 and extends into the body 12;
This prevents the fuel from flowing in three directions through the bore 21 through which it passes.

Nozzle tube 18 is provided with a groove 74 near its lower end for receiving an O-ring 76 so that its inlet is sealed within well 66. Therefore, fuel does not flow from the lower part of the well 66 through the nozzle pipe 18 to the upper part of the well 66. The nozzle tube 18 is hollow and has a nozzle passage 82 and two open lower portions 8,80. In the embodiment of FIGS. 1-8, the lower portion of the nozzle passageway 82 is reduced in diameter to form a jet or metering orifice 84. In the embodiment of FIGS. Fuel bowl 14 further includes two passages 90 , 92 extending through mixing screw housing 86 . Mixing screw housing 86 is integrally formed with fuel bowl 14 . Passage 92.90 is fuel bowl 1
4 and passes through the wall 68. Thus, fuel that collects in the fuel bowl 14 flows into the lower part of the well 66 via the passage 92 and is then siphoned upwardly through the metering jet 84 into the nozzle passage 82. A screw 96 is screwed into the fuel bowl 14. Plug 98 directs fuel from fuel bowl 14 to passage 61.
is prevented from flowing into the well 66 through the. Plug 94 blocks passageway 90, thereby preventing fuel from flowing outside of fuel bowl 14.

As will be described below, passageways 90.92 are used to accommodate mixing adjustment screws in adjustable carburetor embodiments according to the present invention. In the embodiment shown in FIGS. 1-8, fuel flows from the fuel bowl 14 into the well 66 and is metered from the well 66 through the nozzle passageway 82 and into the venturi throat 24. In the embodiment shown in FIGS. Air is sucked into the nozzle passage 82 via the open lower part 8.80. When the primer valve is actuated, the pressure generated within the fuel bowl 14 pressurizes the fuel within the nozzle passage 82, thereby causing the fuel to flow into the venturi throat 2.
It squirts inside 4. However, little fuel flows upwardly from well 66 into channel 28 due to the dimensional difference between passageway 31 and nozzle passageway 82 .

As best shown in FIG. 4, the entire fuel bowl assembly 14 is positioned relative to the body 12 by a pair of locating studs 106.

As best shown in FIG. 5, a float 108 is disposed within the fuel bowl 1.4 and, as is well known, operates a needle valve 120 to maintain the fuel supply into the fuel bowl 14 at a predetermined level. It has a function to activate.

Flow 1-108 is a two-piece heat-sealed acetal plastic having a float arm 110 and pivot pins 112 received within a cradle 114. Pivot pin 112 is retained in a snap fit within cradle 11-4. Thus, as float 108 moves up and down according to the level of fuel in fuel bowl 14, arm 110 attached to needle valve 120 opens and closes the needle valve to control the flow of fuel into fuel bowl 14. .

FIG. 5 shows the needle valve assembly in more detail. A needle valve 120 having a valve stem 128 is retained within the cavity of the float arm 110. The needle valve 120 is provided with a valve seat 122 that is disposed within the bore 124 . The valve seat 122 is made of, for example, DuPont (DuPo).
It is formed of a flexible, resilient material such as a fluorocarbon rubber such as Viton manufactured by NTS, Inc., and is press fit into the hole 124. Fuel flows through passage 126 and when needle valve 120 moves in the -L direction due to lowering of float 108 due to the low level of fuel in fuel bowl 14, fuel passes through needle valve 120 and fills the fuel tank. It is adapted to flow into the bowl 14. The needle valve 120 is connected to the fuel bowl 1
The positioning tube 130 is directly molded into the positioning tube 130. The locating tube 130 has an axial slot (not shown) for draining fuel therefrom and for better flow.

During operation, the body 12 is connected to the fuel bowl assembly 1.
4 and sealed by a gasket 13. Spring clip 16 attaches to fuel bowl assembly 1
4 is elastically fixed to the body 12. Fuel is at fuel inlet 8
8 into the fuel bowl 14. The fuel level within fuel bowl 14 is controlled by float 108 and needle valve 120. Fuel enters the bottom of well 66 via passageway 92 . By the spring 70,
The Tsuyuel nozzle pipe 18 is held in liquid-tight contact with the gas scaler I-13. Fuel is metered through the jet 84 and the throat 24 of the venturi member 22.
injected into the body. The fuel bowl 14 communicates with the throughbore 20 of the body 12 by a passage 62, an annular groove 28, and a connecting axial slot 30. Pressing the primer valve injects fuel into the throat 24 of the venturi member 22.

In most cases, inspection and maintenance of the carburetor is performed in the fuel bowl 14.
This can be done with the carburetor removed and the other parts of the carburetor still attached to the engine. Therefore, for most servicing, it is only necessary to swing the spring clip 16 out of position to allow the fuel bowl 14 to be removed from the carburetor body 12, and the entire linkage of the body 12 is removed. It can be maintained as it is. Therefore, the float 108, needle valve 120, and all other parts of the fuel bowl 14 can be cleaned without having to readjust these linkages relative to the carburetor body 12.

As shown in FIGS. 2 and 13, the fuel bowl 14
The bottom of the groove 151 is provided with a pair of raised portions or shoulders 190 on either side of the groove 151 such that a pocket or recess 192 is formed. Fuel thus flows through the bottom of the fuel bowl 194 and over the shoulder 190 into the bottom of the well 66 through the groove 151. However, if there is dirt or the like in the gasoline, it is collected in the pocket 192 and does not flow into the well 66, thereby preventing clogging of the orifice 158 and other passages of the nozzle 18.

9-11, another embodiment of the invention is shown having an idle mix adjustment screw and a power mix adjustment screw. In this embodiment, through bore 20 in body 12
The choke end 140 of the carburetor is formed with a larger diameter. A choke shaft 142 is inserted into the body 12 through a hole 146, and a choke plate 144 is fixed to the choke shaft 140, thereby allowing the air flow into the carburetor interior to be regulated during cold starting as usual. . The large diameter bore 140 is provided to compensate for the space occupied by the choke shaft 142 and choke plate 144 so that the amount of air that can be taken into the carburetor is not reduced.

A washer 148 is provided around the choke shaft 142 to seal it to the body 12.

In this embodiment, the carburetor is provided with adjustment screws 152,154. Adjustment screw 152 is an idle mix adjustment screw and adjustment screw 154 is a power mix adjustment screw. Both threads 152, 154 have self-tapping threads so that no threads need to be provided during molding of the mixed thread housing 86. Both adjustment screws 152, 154 have conical tips 153, 155 that form an orifice within the bore 156, 158 when they are screwed to their limits.

The tips 153, 155 are shaped so that they do not extend too far into the bores 150, 151 by means of an annular shoulder which acts as a stop. Both screws 152, 154 each have a stem 168, 170.

Idle mixture adjustment screw 152 and power mixture adjustment screw 1
54 is integrated so that all controls, including both adjustment screws and the fuel valve 174, are located in the same general area of the carburetor, thereby greatly improving the ease of access and servicing of the carburetor. It should be noted that the

The stem 168.170 of each adjustment screw 152.154 is
O-rings 162 seal against passages 90.92 to prevent fuel from escaping from fuel bowl 14. Additionally, an O-ring 164 seals the stem 168 of the adjustment screw 152 against the wall 165 to prevent fuel from leaking from the fuel bowl 14 into the passageway 61. It should also be noted that in this embodiment the nozzle tube 18 does not have metering jet holes. Metering takes place via adjusting screws 152,154. Thus, in idle mode, fuel from fuel bowl 14 passes through annular orifice 158 and passage 151 into the bottom of well 66 , from there into nozzle passage 82 and into well 66 through hole 80 . thence into passage 61 via passage 150 and annular orifice 156, and thence into idle boget I-167 by means of idle passage 166 and passage 42, and through several small holes drilled in bore 20. sent into the engine. A laboratory blade zip plug 45 closes the idle holes 1 to 167 in a liquid-tight manner.

In this example, fuel valve 174 is shown as part of the fuel bowl assembly. Fuel valves 174 have passages 178.1-80 for connecting to fuel inlet passage 176 and fuel outlet passage 126, respectively. Thus, by having the fuel valve 174 in the location shown, fuel can flow directly from the port 88 to the needle valve 20. However, when fuel valve 174 rotates, fuel flow is cut off.

The carburetor shown in FIGS. 9-11 is similar to that shown in FIGS. 1-11, except that the idle mix adjustment screw 152 and the power mix adjustment screw 154 have a fully adjustable height and a choke play of 1-14/1. It operates similarly to the carburetor shown in Figure 8. Therefore, the flow of fuel to the engine can be controlled by using these control means in addition to the throttle valve]38.

In the embodiments shown in FIGS. 9 to 1-1, the embodiments shown in FIGS.
As with the illustrated embodiment, the entire fuel bowl assembly, including adjustment screws 1-52.1-54 and fuel valve 174, can be removed in one piece by simply removing splash clip 16. However, there is no need to loosen the linkage for controlling the carburetor throttle and choke valves in order to remove the fuel bowl assembly.

Therefore, the ease of inspection and maintenance is greatly improved compared to conventional carburetors.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications and changes within the technical scope thereof.

Advantages of the Invention A first advantage of the present invention is that it provides a low cost vaporizer assembly that provides excellent functionality and is very easy to assemble so that its manufacture can be automated.

A second advantage of the present invention is that by using a molded plastic venturi insert, venturi members of various sizes can be used in the same extruded carburetor body so that the carburetor can be adapted to a variety of engines. be.

A third advantage of the present invention is that the molded plastic carburetor can be removed from the engine without removing the carburetor so that the carburetor can be serviced without having to remove the linkage or controls and later reconnect or adjust them. The fuel bowl can be removed. Furthermore, fewer tools are required to disassemble the vaporizer.

A fourth advantage of the present invention is that the spring clip can maintain sealing pressure on the gasket even after the gas keratin has developed a compression set.

A fifth advantage of the present invention is that the cost of tooling required to manufacture the carburetor is significantly lower than the cost of tooling required for conventional carburetors.

A sixth advantage of the carburetor according to the invention is that the venturi insert is configured to be sealed within the through-bore of the carburetor body without the use of sealing compound, O-rings, etc. There is a particular thing.

A seventh advantage of the present invention is that the extruded aluminum carburetor body does not need to be impregnated with a seal material as is the case with conventional die cast I aluminum carburetor bodies.

An eighth advantage of the invention is that the carburetor nozzle assembly is configured to be biased with a constant force (=1) by biasing spring means and brought into close contact with the aluminum body to form a suitable seal. Therefore, design tolerances are compensated for by the biasing action of the spring means, and there is no need to use screws or the like to attach the nozzle assembly to the vaporizer.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing a vaporizer according to the present invention. FIG. 2 is a longitudinal sectional view of FIG. 1 taken along line 2-2. FIG. 3 is a partial sectional view of FIG. 1 taken along line 3-3. FIG. 4 is a view taken along line 4-4 in FIG. 1. FIG. 5 is a partial sectional view taken along line 5--5 in FIG. 4. FIG. 6 is a front view of the carburetor shown in the first figure. FIG. 7 is a side view of the venturi insert of the first illustrated carburetor. FIG. 8 is a right side view of the carburetor shown in the first figure. FIG. 9 is a partially sectional front view showing another embodiment of the vaporizer according to the invention. FIG. 10 is a longitudinal cross-sectional view of the carburetor of FIG. 9 taken along line 10-10. FIG. 11 is a cross-sectional view of the body portion of the carburetor shown in FIG. 9, rotated 90 degrees for illustrative purposes. FIG. 12 is a top view of the fuel bowl of the first illustrated carburetor. Figure 13 shows the fuel bowl 13-13 shown in Figure 12.
FIG. 3 is a partial sectional view taken along a line. 10... Carburetor assembly 12... Body 13... Gasket 14.
...Fuel bowl 15...Flat part 16...Spring clip 17...Curved part 18...Nozzle pipe 2
0...Through bore 21...Nozzle hole 22...
Venturi insertion member 24...Venturi throat 26...Through hole 28...Annular channel 30
... Axial slot 31 ... Passage 32 ... Tapered portion 34 ... Throttle shaft bore 36 ... Throttle shaft 37 ... Speed screw assembly 38 ... Throttle plate 39 ... Fixture 40 ... Seal washer 4
2.44... Passage 45... Bore 46... Passage 48... Plug 50... Restriction
61... Passage 62... Vent passage 64... Valve ball 65... Stopper 66... Well 67...
・Valve seat 68...Wall part 69...Passage
70... Compression spring 72... Shoulder part 74
... Groove 76 ... O-ring 78.80 ... Hole 82 ... Nozzle passage 84 ... Jet 86 ...
・Mixing screw housing 88...Fuel inlet 90.92...Passage 94・
...Plug 96...Screw 98...Plug
106... Positioning stud 108... Float 110... Float arm 112... Pivot pin 114... Cradle 120... Needle valve 122... Valve seat 124... Hole 126
...Passage 128...Valve stem 130...Pipe 1
40...Choke end 142...Choke shaft 144...Choke play 1 146...Hole 148...Washer 150...Passage 151...Groove 152...Screw 1
53...Tip 154...Screw 155...
・Tip 156.158...hole 162.164...
・0 ring 165...Wall part 166...Idle passage 167...Idle pocket 168.170...Stem 174...Fuel valve 176...Fuel inflow passage 1
78.180...Passage 190...Shoulder 192...
Recess 194...Fuel bowl patent issued
Client: Tekamze Products Company Representative Patent Attorney: Yasuo Takahashi FIC
,13

Claims (10)

[Claims] (1) An extruded body provided with a through passage having an air inlet, a fuel bowl fixed to the body, a generally cylindrical bench lily member installed in the through passage, and a bench lily member extending from the fuel bowl to the bench lily member. a means for introducing fuel into the carburetor assembly. (2) The first aspect of the present invention is characterized in that the bench lily member has a radial passage, and the fuel introduction means comprises a cylindrical member extending into the radial passage.
Vaporizer assembly as described in Section. 3. The carburetor assembly of claim 1, wherein the bench lily member is a molded plastic member. (4) The bench lily member has a radially outwardly tapered shape having elasticity at one end so that the bench lily member is deformed when inserted into the through passage and forms a circumferential seal between the bench lily member and the through passage. A carburetor assembly as claimed in claim 1, characterized in that it is a generally cylindrical member having a circumference of . (5) The bench lily member has an annular groove and an axial groove provided on its outer peripheral surface, and the axial groove and the annular groove are connected to each other, and the annular channel and the axial groove are connected to each other with respect to the through passage. 2. The carburetor assembly of claim 1, wherein a channel is formed and said annular channel communicates with said fuel bowl by a passageway in said extruded body. (6) a well member is formed within the fuel bowl;
2. The carburetor assembly of claim 1, wherein said fuel introduction means comprises a cylindrical nozzle with one end disposed within said well member. 7. The carburetor assembly of claim 6 further comprising resilient spring means for biasing said nozzle into tight engagement with said extruded body. 8. The carburetor assembly of claim 1 further comprising resilient clip means for securing said fuel bowl to said extruded body. (9) The fuel bowl is molded from a plastic material and includes a fuel tank and an idle mixture adjustment screw and a main mixture adjustment screw screwed onto the fuel bowl,
The fuel bowl assembly has a well defined by a vertical wall, the vertical wall having a hole for receiving a tip of the idle mix adjustment screw, and the tip opening an orifice in the hole. A carburetor assembly according to claim 1, characterized in that it is formed. 10. The carburetor assembly of claim 9, wherein the idle mix adjustment screw and the main mix adjustment screw extend through at least a portion of the fuel tank of the fuel bowl.