JPS6048626B2 - How to manufacture a carburetor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a carburetor with different characteristics without replacing the main body member by selectively using a plurality of thin layer members each having apertures of different shapes and sizes. .

A prior art carburetor using laminar members disposed between a plurality of body members is disclosed in U.S. Pat. No. 112,536.
No. 8, 233891 Gin, 290325 Gin, 299457
No. 1, No. 3,633,557 and No. 3,743,253.
However, in the carburetors shown in these US patents, it is simply a gasket or flexible diaphragm that acts as a sealing member or valving member to prevent leakage of fluid between the body members. The openings formed in these gaskets merely act as fluid passages for communicating the fluid passages formed in the main body member, and have no function of controlling or adjusting the flow of fluid therethrough. I didn't have one. Therefore, in the past, in order to provide carburetors with various flow characteristics for engines of various sizes, different fuels were used to appropriately deliver mixtures of fuel and air to engines of various sizes. In addition, it was necessary to prepare a large number of main body members for air passages.

An object of the present invention is to prepare a plurality of thin layer members each having a different opening shape and size, and to connect a first main body member in which a fuel and air mixing passage is formed and a fuel passage. To manufacture a gear burr with various characteristics as required without replacing the main body member by arbitrarily selecting and mounting the thin layer member between the formed second main body member.

The present invention comprises a fuel and air mixing passage having an air inlet area, a mixture outlet area and a vent lily between said areas, a bottom surface if flat, a main orifice opening at one end into said air mixture outlet and one end opening into said air mixture outlet. a first body member 11 provided with at least one auxiliary orifice 149, 150 or 151 opening into the area;
a second body member 1 adapted to be removably attached to the body member of the invention and provided with a fuel supply chamber 82;
2, a plurality of air bleed passages 166 each having one end opening into the air mixing passage in the first body member;
, 242, 244, forming a passage having one end that can communicate with the air mixing passage via the engine speed governor 212;
The main orifice, the auxiliary orifice, the air bleed passage, and the other end of the passage are opened in the bottom surface at different positions, and four fluid passages 144, 159, 168, first to fourth, are provided in the second body member. and 234 to communicate the first fluid passage 144 with the fuel chamber via the first regulating valve 140, and to communicate the second and third fluid passages 159, 168 with the fuel chamber via the second regulating valve 156. a fourth fluid passageway in communication with each other and with the fuel chamber, one end of each of the fluid passageways of the second body member opening into the planar upper surface of the second body member at a different location; The fluid passageway includes the main orifice, the auxiliary orifice,
a plurality of apertures are formed for selective communication with the air bleed passageway or the first body member passageway, the apertures being differently shaped to provide different types of fluid connections between the fluid passageways; A plurality of thin layer members 14, 14a
-14g of the first body member, the second body member and the thin layer member selected from the first body member, the flat bottom surface of the first body member and the second body member. It is configured to be assembled by being sandwiched between the main body member and the flat upper surface of the main body member.

Embodiments of the present invention will be described below with reference to the drawings.

One type of carburetor construction and fluid flow control device may include a diaphragm operated by engine suction negative pressure to regulate the flow of fuel from the supply side to the flow control device. Other types may include the feature that the float controlled device regulates the flow of fuel to the flow control device. Both types are shown in embodiments of the invention. A diaphragm type carburetor or carburetor 10 that operates under suction negative pressure and a fluid flow control device attached to the carburetor are shown in FIGS. 1 through 29.

Initially, referring to FIGS. 1-8, the carburetor includes a main body structure consisting of a first body member 11 and a second body member 12. As shown in FIGS. Disposed between the first main body member 11 and the second main body member 12 of the carburetor is a flow control means including a laminar member 14 having an opening formed therein for controlling the flow rate of fluid. The present invention is adapted to use replaceable flow control means or laminar members 14, each of which has a different passageway for use with body members 11 and 12, thereby Different adjustments to the carburetor can then be accomplished by replacing the laminar member 14 without changing the body member.

The main body element or body member 1; a limited mixture outlet area 21 and a choke band area 27 of minimum diameter;
pliers with A bench lily member 24 is provided which is configured to provide a lily 26 (FIG. 8).

In the embodiment shown in FIG. 8, the cylindrical walls 19 and 22
and are connected by an inclined surface 30.

Bench lily member 24 is removable so that bench lily 26 having different diameters can be used to vary the flow rate and thus allow the carburetor to be used with different power engines. As shown in FIGS. 2 and 8, the vane lily member 24 is adapted to fit within a recess 35 in the first body member 11 to align the member with the mixing passageway. A protrusion 33 is formed.

Body member 11 has a hole 38 within which a mounting member 40 providing a primary orifice is tightly fitted.

The attachment member 40 protrudes into the hole 42 of the bench lily member 24 to hold the bench lily member in place within the mixing passage. The fuel pump includes a fuel pump structure 69 (FIG. 7) having a pump plate 70 secured to the body member 11.

The pump structure will be described later. One type of thin layer member 14 constituting the flow rate control means 1 is shown in FIG.

The laminar member 14 is formed with apertures having a specific shape to adjust the flow rate of fluid for fuel conditioning for a specific internal combustion engine. The laminar member 14 is a flat structure and may be formed from a plate of a suitable material by punching. The thin layer member 14 is made of gasket material, synthetic rubber,
Resinous plastic materials, or copper, brass, aluminum or stainless steel! / made of a suitable metal such as steel, which is not altered by hydrocarbon fuels.

Preferably, a thin sealing gasket 15 is in contact with the surface of the laminar member 14. The adjustment and operating characteristics of the carburetor can be changed simply by replacing one laminar member 14 with another. In addition to the shape shown in FIG. 16, several other shapes of laminar members are shown in FIGS. 19-22 and 23-26. The second body member 12 is formed with a shallow recess defining a fuel chamber 82 containing fuel to be supplied to the laminar member 14 .

A flexible diaphragm 84 (FIG. 7) extends across the recess and forms one wall of the fuel chamber 82. Cover member 86 is in contact with the periphery of the diaphragm. Valve 1
Means is provided for communicating movement of the diaphragm 84 to the valve 104 to control the position of the diaphragm 84 and thereby regulate the flow of fuel into the fuel chamber.

The suction negative pressure generated in the mixing passage 17 is transmitted to the fuel chamber 82 and moves up the diaphragm, swinging the lever 112 counterclockwise (in FIG. 7) and closing the valve portion 108.
is withdrawn from the boat 106 to send fuel from the surge chamber 95 to the fuel chamber 82.

The carburetor mixing passage includes a main or first fuel supply system for supplying fuel into the mixing passage for medium and high speed engine operation, and a mixing passage 17 for engine idling and low speed operation. and a second or auxiliary fuel supply system having an auxiliary exhaust orifice opening therein. 1st
The fuel supply system includes a main orifice 126 in the mounting member 40.
have. The main orifice 126 has one end opening into the bench lily and the other end opening through a passage 132, which will be described later. and opens into a flat bottom surface 50 (FIG. 8) of the first body member 11. In FIG. 14, the second body element or member 12 has holes 134, 135 for receiving a high speed regulating valve or restrictor 137.

The high speed regulator valve 137 has a portion 139 terminating in a needle portion 140 that cooperates with a restriction passage 141 that communicates with a fuel passage 143 that receives fuel from the fuel chamber 82 . As shown in FIGS. 4, 7 and 8, passageway 144 opens into the flat top surface of body member 12 and connects passageway 132 of attachment member 40 through an opening or passageway 145 in laminar member 14. It's communicating. Thus, through the passageways shown in FIGS. 4, 7, 8, and 14, fuel is delivered to the main orifice 126 and the flow rate of the fuel is controlled by the high speed regulator valve 137 which regulates the needle portion 140. It is adjusted by adjusting . A second fuel supply system for idling and low speed motion is shown in FIGS. 4, 8 and 13.

First body member 11 is formed with an auxiliary chamber 147 (FIG. 8) which communicates with mixing passage 17 by means of a hole arrangement, idling orifice 149 and slow orifices 150 and 151. Therefore, the idle orifice 149 and the low speed orifice 150
and 151 opens into the air-fuel mixture outlet area 21 and the other end opens into the bottom surface 50 of the body member 11 via the auxiliary chamber 147. The idle orifice and the low speed orifice form an auxiliary orifice. The second body member 12 is formed with a bore 153 (FIG. 13) that defines a regulating valve or restrictor 154 having a needle portion 157 cooperating with a restriction passage 158 opening into a passage 159. 156. Passage 159 opens into an elongated opening or passage 161 in laminar member 14 that controls the flow of fuel.

The passage 161 shown in FIGS. 4, 13, 15 and 16 opens into an enlarged open area 163 of the lamina 14 and communicates with the auxiliary chamber 147. Fuel from passage 159 flows through a portion of long passage 161 into auxiliary chamber 147 to provide aerated fuel to idle and low speed orifices for idle and low speed operation of the engine. Figures 4, 8 and 15
As shown, the other end 162 of the passageway 161 is aligned with a hole 165 that communicates with a restricted hole arrangement or air bleed passageway 166, which
The channel opens at one end into the air introduction area of the mixing channel 17 and at the other end through the hole 165 into the bottom surface of the body member 11.

Thus, the air bleed passage 166 takes in filtered air from the air inlet area 18 of the mixing passage, which air flows through the elongate passage 161, and which air flows through the body member 1.
The fuel-air mixture flows through an enlarged open area 163 into the auxiliary chamber 147 adjacent to the engine idle and low speed orifices. . The above-described device supplies fuel from the main orifice 126 for normal engine operation and supplies liquid fuel mixed with air from the passageway 161 to the auxiliary chamber 147 for the secondary fuel supply system. It is called a subordinate idling device.

This subordinate idling device is one of the devices adapted for obtaining fuel for the second fuel supply system from an area of the first fuel supply system, in which:
Fuel to both fuel supply systems is controlled or regulated by the position of a high speed regulator valve 137 having an adjustable needle. Fuel and air flow passages in the first body member 11, the second body member 12, and the laminar member 14 are used to supply fuel to the main orifice 126 and to the idling orifice 149 of the subordinate idling device. and is schematically illustrated in FIG. 28 for delivering fuel and air to low velocity orifices 150 and 151.

In FIGS. 4, 13, 14 and 16,
The opening or passage 145 in the thin layer member 14 is connected to the fuel passage 1
43 through the needle portion 157 from the hole 153 housing the restriction passage 141, the passages 144, 168 and the idle and low speed regulating valve 154, and passage 159.
It forms a fluid flow path through which fluid flows to a passage 161 for mechanical bleed.

The first fuel distribution hole device consists of a main orifice and the second one consists of an idle and low speed orifice.
All fuel to both the fuel distribution hole system flows from the fuel passage 143, which passage is the adjustable needle portion 14 of the high speed regulator valve 137? It receives fuel from the fuel chamber 82 through the fuel chamber 82 . The fuel to be supplied from the main orifice 126 passes from the fuel passage 143 to the passage 144,
13 and 16, thence past the check valve 130, through the hole in the mounting member 40, and through the main orifice 126.
through and into the bench lily area of the mixing passage.

Fuel for the idle and low speed orifices is routed from the fuel passage 143 past the needle portion 140 to the second
Passage 1 in laminar member 14 through groove 144 in body member 12
45 and flows through passage 168 into hole 153 and then past regulating valve 154 to passage 158,1.
59 and 161, in the enlarged open area 163 at one end of the passageway 161 and in close proximity to the idle and low speed orifices? flows within.

Thus, fuel to both the main orifice and the idle and low speed orifices of the subordinate idle device is regulated or controlled by the needle portion 140 of the high speed regulator valve 137, and the needle portion 157 controls the engine to idle and low speed. Supplementally adjust the fuel to An air bleed passage 166 as an air bypass passage shown in FIGS. 4, 8 and 15 is provided from the introduction area of the mixing passage for mixing with the fuel supplied through the idle orifice 149 and the low speed orifices 150 and 151. It flows into the auxiliary chamber 147 through the passage 161 .

The function of the check valve 130 in the main orifice mounting member 40 is such that when the idle orifice 149 or the low speed orifices 150 and 151 are distributing fuel into the mixing passage, additional air flows through the main orifice 126 to the second fuel. This is to prevent it from being sent back into the supply system.
Otherwise, the additional air will pass through the main orifice to the second
into the fuel supply system, the mixture of fuel and air becomes low and the engine stops. In the apparatus shown, other aperture patterns having different aperture patterns formed to alter the fuel and air control characteristics of a capletor of the same size as the laminar member 14 shown in FIGS. 7, 8 and 16 are used. The thin layer member for flow rate control can be exchanged with each other.

Several forms of laminar members are shown in the figures and described below, each having apertures of different shapes and/or sizes.

In addition, the bench lily member 24 is interchangeable with different sized bench lily members, allowing the carburetor to be used with engines of different sizes and power outputs. In FIG. 9 a device similar to that shown in FIG. 8 is shown, in which the flow control means or laminar member 14' is made of metal.

Where metallic laminar members 14' are used, gaskets 172 are used in addition to gaskets 15 to contact other surfaces of laminar members 14' to form a fluid seal with body members 11 and 12. It is desirable to do so. The structure shown in FIGS. 1 to 8 has a diaphragm type fuel pump 69, and the diaphragm of the fuel pump 69 is connected to the main body member 1 of the carburetor shown in FIG. 7 from the fuel supply side.
It is operated with pulses of pneumatic pressure by varying fluid pressure to supply fuel to the passages 97 of 1.

While the air chamber, that is, the pump chamber 182 is under negative pressure, the fuel chamber 1
The portion of the diaphragm proximate 92 moves or bends away from the fuel chamber and closes the inlet flap valve 194 (FIG. 11).
is opened and the fuel is passed through the inlet flap valve from the supply side through the nipple 176, the connecting passages 202 and 203, and
Fuel chamber 192 is passed through gap 200 of member 178 and then through connection chambers 205 and 206 shown in FIG.
flow inside.

Pressure impulses or waves from the engine crankcase that are transmitted to the pump chamber 182 through pulse passages 188, passages 186 and recesses 184 shown in FIGS. 3 and 10 push the diaphragm toward the fuel chamber 192. do. This movement of the pump diaphragm 180 causes the inlet flap valve 194 to close and the outlet flap valve 195 to open.

This action causes the fuel in the fuel chamber 192 to flow past the outlet flap valve 195 through the connecting passages 208 and 209 shown in FIG. 12 and into the chamber 211 shown in FIGS. 7 and 12. Fuel within chamber 211 flows through screen or filter 98 and through passageway 97 into surge chamber 95 of carburetor body member 11.
The surge chamber 95 contains fuel and serves to cushion the shock of the fuel that occurs when the pump outlet flap valve 195 is closed. When the engine is operating, the diaphragm 1 of the pump in close proximity to the fuel chamber 192 and the pump chamber 182
80 is rapidly bent or vibrated, and the inlet flap valve 194 and outlet flap valve 195 are actuated rapidly to flow fuel from the supply side through the fuel chamber 192 into the surge chamber 95 of the body member 11; The result is about 0.

Fuel under a relatively low pressure of 35 k9/d (5 bonds per square inch) is supplied to the boat 1 for the fuel inlet shown in FIG.
It is maintained in a surge chamber 95 where 06 is placed.

The operation of the carburetor shown in FIGS. 1 to 8, 13 and 14 is as follows. In starting an engine equipped with a carburetor according to the invention, the operator opens the throttle valve 60 and closes the cheek valve 56. The reciprocating motion of the engine piston creates a reduced pressure, that is, suction negative pressure, in the mixing passage 17. The suction negative pressure causes fuel to flow from the fuel chamber 82 of the body member 12 through the passage 143 shown in FIG. It flows through passageway 132 and through main orifice 126 into the mixing passageway. When the engine is started, the choke valve 56 is opened manually by the operator, and the speed of the engine depends on the opening of the throttle valve 60. Controlled by adjusting the needle valve.

When the slot valve 60 is moved near the closed or engine idle position as shown in FIG. Engine suction underpressure is provided through the idling orifice 149 and fuel is supplied from the auxiliary chamber 147 into the mixing passage downstream of the throttle valve 60. Fuel for engine idling operation is first supplied to the needle portion 140 of the high-speed regulating valve 137.
and from passage 144 through passage 145 of laminar member 14 and shown in FIG.
8 and passes through passage 159 past the needle part 157 of the regulating valve for engine idling, then through passage 161 and through the enlarged opening area 163 shown in FIGS. 4, 8 and 16 into the auxiliary chamber. 147 and is supplied to the engine through an idle orifice 149. The other end of the elongate passageway 161 communicates with a restricted air bleed passageway 166 that provides a limited amount of air to mix with the fuel before dispensing the fuel through the engine idle orifice 149.

Air bleed passage 166 opens into the mixing passage shown in FIG. 15 so that dusted air flowing into the mixing passage through a filter (not shown) is passed into passage 161. . While supplying fuel through the idle orifice 149, the check valve 130 is engaged with the seat of the main orifice mounting member 40 as shown in FIGS. Prevents air from flowing back into the system.

If too much air flows into the fuel supply system, the engine will stall. When the throttle valve 60 is partially opened by the driver, the additional fuel and air mixture from the auxiliary chamber 147 is directed to one or both of the low speed orifices 150 and 151 depending on the opening of the throttle valve 60. and into the mixing passage.

As the engine speed increases by further opening the throttle valve 60, the supply of the fuel and air mixture through the idle orifice 149 and the low speed orifices 150 and 151 is such that the fuel is removed from the main orifice for normal and high speed operation of the engine. supply, so it gradually decreases. When necessary, the die-cast body member 11 is adapted to receive an overspeed governor structure or engine speed control device, as shown in FIG. 226 is actuated by the frequency of the engine occurring at a particular speed.

The ball valve 226 vibrates off the valve seat, allowing additional fuel to be delivered into the mixing passage. In operation of the engine governor described above, when the engine vibrations reach a frequency to which the ball valve 226 responds, the ball valve is typically moved laterally within the chamber provided by the counterbore 220, so that the fuel Fuel from chamber 82 is directed to passageway 234, opening or passageway 236 in laminar member 14.
through the passageway 238 and the recess 23 of the mounting member 218.
0 and passage 232 and then through the chamber provided by counterbore 220 and is sucked into the mixing chamber through boat 223 and passage 240.

The excess or additional fuel supplied to the mixing passage provides a larger amount of fuel and air mixture that is supplied to the engine crankcase and thence to the engine cylinders.

A large fuel and air mixture burns slowly or is difficult to ignite and automatically and almost immediately reduces engine speed, thereby preventing engine overspeed. By providing standard carburetor body members 11 and 12 and passageway 236 in laminar member 14, fuel can
Hole 21 drilled to accommodate engine speed governor 212
4, by drilling a passage 238 in the body member 11 and by drilling a passage 240 through the body member 11 at the bottom of the hole 214 and through the bench lily member 24. readily available.

With this method, the engine speed governor 212 can be replaced with a standard carburetor main body member 11 or without the need for molding a separate main body member.
can be easily applied to accommodate. A restricted air bleed passage 166 shown in FIG. 15 is aligned with the end 162 of the passage 161, through which a restricted or regulated amount of air from the mixing passage can be removed. 8 and 1 through the bleed passageway 166 and throughout the long passageway 161 of the laminar member 14.
It flows into the enlarged open area 163 shown in FIG. 6 and provides air to mix with the fuel to provide a mixture for engine idle and low speed.

The present invention provides that the length of travel of the air for mixing with the fuel in the auxiliary chamber 147 is reduced by an interchangeable alternative flow control means or laminar member having openings or passageways of another shape and/or size. can be changed simply by changing the length or shape of the passageway 161 using the . In order to easily change the flow rate characteristics of the air bleed passage for mixing fuel and air in the auxiliary chamber 147, the main body member of the carburetor may be provided with several air bleed passages that open into the mixing passage 17. Desirably, each of these air bleed passages can be selectively varied to match the shape of the passage formed in a particular laminar member. Thus, several different air flows for air bleed can be created by simply replacing the laminar member that is the flow control means with various other laminar members having passageways of different shapes and dimensions. road is available.

In FIG. 18, the bottom plane of the main body member 11 is the thin layer member 1.
4 and body member 12 removed, the view shows two additional hole arrangements or air bleed passages 24 drilled into body member 11 and opening into the mixing passage.
2 and 244 are shown.

When a separate passage is required for air bleed purposes, an air bleed passage 244 that opens into the mixing passage is used. To achieve this objective, a laminar member 14a is provided as a flow control means shown in FIG. 19, which laminar member 14a is interchangeable with the laminar member 14. The air flow opening or passageway 161a in the laminar member 14a is relatively short and its ends are aligned with the air bleed passage 244 in the carburetor body member, the relative position of which is indicated by the dashed line in FIG. It is shown in

Air is restricted from the mixing passage through an air bleed passage 24.
4 and into the enlarged open area 163 through the short passage 161a and mix with the fuel in the auxiliary chamber 147 shown in FIG. The air for air bleed can be adjusted by the size of the restricted air bleed passage or by varying the width or cross-sectional area of the relatively short passage 161a. In FIG. 20, the shape of the opening or passage 161b of the thin layer member 14b as a flow rate control means is shown, and in the thin layer member, air for air bleed is opened into the air introduction area of the mixing passage 17. Preferably, the air bleed passage 242 is provided through an air bleed passageway 242. As shown in FIG. 20, the end section of passageway 161b is aligned with air bleed passageway 242, and elongated passageway 161b is formed out of alignment with air bleed passageways 166 and 244. Air bleed passages 166 and 244 are thus closed off by an integral portion of laminar member 14b, but air flows from the mixing passage to restricted air bleed passage 242, through passage 161b to enlarged open area 163. Flows into the auxiliary room 147 i
gives air to mix with the fuel.

In the example in which air bleed passage 244 is used in conjunction with laminar member 14a shown in FIG. 19, a substantial difference in carburetor operation is manifested in engine speed.

Engine idling operation with the throttle valve in the closed position or near the engine idle position and air bleed through the air bleed passage 244 shown in FIGS. 18 and 19 is illustrated in FIG. This is the same as engine idling when other air bleed passages are used. However, if air to be mixed with fuel for engine idling is available through air bleed passage 244, slot valve 6
Due to the partial opening of 0, the velocity of the air in the mixing passage increases substantially and then a significant suction vacuum builds up in the vent lily.

When the main orifice suction is increased by partially opening the throttle valve, the amount of air entering the restricted air bleed passage is greatly reduced. Thus, such as the positions shown at 166, 242 and 244 or any other desired position,
By varying the relative position of the restricted air bleed passage opening into the mixing passage, the control characteristics of the carburetor can be varied to successfully operate an internal combustion engine with particular operating characteristics.

In FIG. 21, a thin layer member 14 as a flow rate control means is shown.
c is shown in which the thin layer member has an air bleed passage 166.
, 242 and 244.

The opening or passageway 161c is relatively short and its ends are aligned with the fuel flow passageway 159 shown in FIG. Fuel for engine idling and low-speed operation flows from the fuel passage 159 into the passage 161c and into the enlarged opening area 163 and the auxiliary chamber 147. In places where air bleed is not required, the thin layer member 14c can be substituted for the thin layer member 14. In FIG. 22, a flow control laminar member 14d is shown having an opening or passageway 161d formed in alignment with an air bleed passageway 166, which is an enlarged air bleed passageway communicating with an auxiliary chamber 147. The opening area 163 opens into the mixing passage for conveying air to the open area 163.

Passage 161d communicates air bleed passage 166 with enlarged open area 163 if a long air bleed passage is required to convey air for mixing with fuel in auxiliary chamber 147 for conditioning purposes. air bleed passage 24
2 and 244 are the thin layer members 14 as shown in the 22nd
It is occluded by a solid area of d. FIG. 23 is a view similar to FIG. 4 showing a carburetor using a laminated member as a flow control means with openings or passageways through which fluid flows to provide a so-called independent idler regulator; be.

The independent idle device is limited by the regulating device and
In that regulator, fuel supplied into the mixing passage through the idle and low speed orifices is removed directly from the fuel chamber of the carburetor independently of the fuel chamber and from the fuel delivered to the mixing passage through the main fuel orifice. It will be done. In Figure 29, fuel and air flow passages in the body and laminar members are shown for supplying fuel to the main orifice and supplying fuel and air to the idle and slow orifices of a separate airing device. .

One form of laminar member as a flow control means for accomplishing this purpose is shown as 14e in FIG. 24.

In FIG. 23, bottom cover plate 86e is secured to carburetor body member 11 by screws 88e, which hold body member 12 and laminar member 14e in assembled condition. An escape port is formed in the gap between the diaphragm and the cover plate 86e by an opening 90e. The carburetor shown in FIG. 23 includes a high speed regulating valve or restrictor 137e and an idling and low speed regulating valve or restrictor 154e. Fuel for high speed operation of the engine is supplied from the fuel chamber 82 shown in FIGS.
Flow occurs in the second passage 144e.

From passageway 144e, fuel passes through an opening or passageway 246 formed in the laminar member and to the mounting member 4? shown in FIGS. 7 and 8. passage, and fuel is discharged through the main orifice 126e into the choke band area of the mixing passageway bench lily. The engine idle and low speed or second fuel supply system shown in FIG. into the opening or passageway 161e and then through the enlarged open area 163e of that passageway to the auxiliary chamber 147 shown in FIG.
controls the flow of fuel through the restriction passage 158e to supply the fuel to the engine, such that the fuel is supplied through the engine idle orifice 149 when the throttle valve 60 is in the engine idle position and when the throttle valve is partially open or When in the low speed position, it is fed into the mixing passage through low speed orifices 150 and 151.

Fuel for the second fuel supply system is passed to supply fuel through the main orifice 126e.

Independently of the passageway 143e for fuel is obtained from the cavity-like fuel chamber 82 shown in FIGS. 7 and 8. Second
As shown in FIGS. 3 and 24, the laminar member 14e is formed with a triangular opening or passageway 248 that is aligned with the fuel supply passageway 234 shown in phantom in FIG. Flows through passage 234 into passage 248 . Passage 248 is aligned with passage 168e, which corresponds to passage 168 shown in FIG.

Fuel in passage 168e flows through hole 153e and past regulator valve needle portion 157e and into passage 159.
e into passageway 161e and into an enlarged open area 163e to feed through the engine idle and low speed orifice. In FIG. 23, fuel for the high velocity orifice is obtained directly from the fuel chamber through fuel passage 143e, while fuel for the second fuel supply system is obtained from fuel chamber 82 through passage 234, which is completely independent of fuel passage 143e. Flows directly. The device is shown schematically in FIG. 29. The other end of air bleed passage 161e is aligned with a hole arrangement or air bleed passage 166e opening into the mixing passage, such as air bleed passage 166 shown in FIG. Thus, in the device shown in FIGS. 23 and 24, the air that mixes with the fuel in the area of passage 159e)
Passage 161e has the same characteristics as shown at 161 in FIG. 4, consisting of a passage of considerable length for conveying air to mix with the fuel in the area of passage 159e. The laminar members shown in FIGS. 19, 20, 21 and 22 are interchangeable with laminar member 14e, and any of the laminar members shown in these figures provide passageways for fuel. 1
Laminar member 14e shown in FIG. 23 may be replaced to provide air bleed passages of different lengths to vary or control air bleed into the fuel in the area of 59e.

FIG. 25 is a plan view showing a thin layer member 14f as a flow control means which is compatible with other thin layer members shown herein.

Laminar member 14f is formed with an opening or passageway that applies the carburetor to a regulator in which there is no regulator valve and a fixed main orifice directs fuel into a mixing passage for normal and high speed operation of the engine. and in which fuel for engine idle and low speed is supplied through passages from the fuel chamber 82 independently of the fuel from the chamber for direct discharge through the fixed main orifice. In a device of this nature, the use of fixed main fuel supply openings, orifices or jets, fast regulator valve 137 shown in FIG. 14 or fast regulator valve 137e shown in FIG. 23 is eliminated.

In the case of using a fixed fuel supply orifice without an adjustable valve arrangement, the same Guikast body is used, but the recess to accommodate the fast regulating valves 137, 137e may not be provided. In using the device having the passage shown in laminar member 14f, fuel is supplied through the fixed main orifice from the fuel chamber 82 of the carburetor to passage 143 shown in FIG. 14 or shown in FIG. It is obtained through passage 143e. This passageway is aligned with an end portion of opening 252 shown in FIG. 25, and the other end portion of opening 252 is aligned with a passageway in mounting member 40 shown in FIGS. Fuel is then discharged directly through the main orifice 126 or through the main orifice 126e shown in FIG. The laminar member 14f is provided with a Ξ-shaped passageway 248 which cooperates with the fuel flow path shown in FIG. 13 to direct fuel to the air bleed opening or passageway 161f.

The fuel flow path for engine idling and low speeds is
The structure is the same as that shown in Figure 3. Fuel mixed with air from passage 161f, which corresponds to passage 161c shown in FIG. 21, flows into enlarged open area 163f and into the auxiliary chamber shown in FIG. In FIG. 26, it can be used with a carburetor implementing an independent idling device and includes a regulating opening for directing fuel through a main orifice, such as main orifice 126 shown in FIGS. 7 and 8. A thin layer member 14g is shown as a flow rate control means.

In this manner, the laminar member 14g is formed with a fuel adjustment opening or passageway 256 that can be aligned with the passageway 132 in the main orifice fitting 40 shown in FIG. The supply of fuel to the regulating opening 256 in the laminar member 14g is provided by a thin metal section or web 1 separating the passageway 144 shown in FIGS. 7 and 8 from the fuel chamber 82.
By providing an opening in 46, this can be done directly from the fuel chamber.

The fast regulating valve 137 shown in FIG. 14 or the fast regulating valve 137c shown in FIG. There is no need to use the passageway 143 shown in FIG. The thin layer member 14g shown in FIG. 26 is designed to facilitate the supply of fuel from the carburetor fuel chamber to the engine idling and low speed fuel supply system independently of the fuel supply system for the main orifice. A shaped opening or passage 248g is formed. Fuel for idling and low speed operation of the engine is supplied from the passage 248g to the opening or passage 1 through the hole housing the regulating valve 154 for the engine idle link.
It flows to 61g. Fuel mixed with air flows through enlarged open area 163g into auxiliary chamber 147 shown in FIG. 8 for supplying engine idle and low speed orifices. The fuel source, the air passage or the air differential pressure and the mixture pressure are obtained at selected openings of the flow control means, and in this way usually only one flow control means can be used with different shapes and/or dimensions. by replacing it with other flow control means having an opening or passageway of
Provides versatility in adjustment.

Additionally, vent lily members 24 of different inner diameters or shapes may be inserted into the passageway of body member 11 when it is desired to increase or decrease the airflow capacity of mixing passageway 17. With this convenient carburetor body member 11 of one size,
The carburetor can also be applied to engines of different capacities, sizes or with different operating characteristics. FIG. 27 shows another example of a carburetor body element or body member, and is a cross-sectional view similar to FIG. is slidably disposed within a hole 269.

In the apparatus shown in FIG. 27, the carburetor includes a first body member 260 and a second body member 260, both of which are die-cast.
It has a main body member 262. First body member 26
0 and the second main body member 262, there is a thin layer member 14'' as a flow rate control means having the same size as the thin layer member described above.
is located. Thin layer member 1 constituting flow rate control means
4'' to control air bleed into the fuel for idling and low speed operation of the engine and to supply fuel into the mixing passage through the main orifice 126'' before supplying air into the mixing passage. A perforated pattern of open areas is provided for channeling fluids such as liquid fuel and air into the various passageways.

Laminar member 14'' is the same size as laminar members 14 to 14g, and lamina member 14'' differs from the other laminar members in the following respects. That is, the laminar member 14'' has a circular opening 280 aligned with the hole 269 for receiving the valve body 104'' of the fuel inlet valve, and a hole 278 that is aligned with the hole 278 for receiving the coil spring 122''. a second circular opening 282.None of the laminar members 14-14g
0 and 282 are provided, the circular aperture 28 for installation in the carburetor shown in FIG.
0 and 282 may be formed.

In such a case, the aperture 94 shown in the laminar members of FIGS. 16 and 19-26 would be eliminated. 1st
By using a main body member, a second main body member, and a thin layer member for controlling flow rate attached between both main body members, manufacturing of the carburetor is facilitated, and in the carburetor, one thin layer member is , its properties can be changed by simply replacing it with another of the previously mentioned laminar members having apertures of different dimensions.

The present invention enables mass production of two die-cast body parts of a carburetor, which carburetor body parts can be of different sizes and capacities or have different capacities without making another die-cast body part. In order to enable use in engines having different adjustment characteristics, the flow control means or laminar members are interchangeable. Each laminar member is easily made from sheet metal by using a punching die of the desired shape, and such punching dies are inexpensive.

The flow characteristics of the apertures in some examples of laminar members can be varied by using materials of different thicknesses or by widening or narrowing the passages as required for particular adjustments or operating characteristics for the carburetor. It can be changed. When the engine regulator is to be implemented in a carburetor as shown in FIG. 17, the standard body member 11 is provided with a recess 214 as shown in FIG. 17 and threaded to accommodate the engine governor. A passageway 238 is provided in the standard body member to accommodate 212 and eliminate the need for a new die-cast body. If a fixed orifice is required,
The drilling of holes 134, restriction passages 141 and threading of portions of the holes shown in FIG. 14 eliminates the need for molding a new separate body member that would be necessary to change the operating characteristics of the carburetor. It is abbreviated as follows.

As previously mentioned, the carburetor body members 11 and 12 do not require any modification or modification to convert the dependent idle link system into an independent idle system, preferably at 14e in FIGS. 23 and 24. Such modifications may be accomplished by using defined shaped apertures in the laminar members as shown.

In accordance with the present invention, by using selected laminar members having openings or passageways of the desired shape to obtain the required tuning or operating characteristics for the carburetor,
And the use of the same die-cast body member for many applications provides the carburetor with greater flexibility for different operating conditions and control characteristics, such as varying fuel flow rates.

[Brief explanation of the drawing]

FIG. 1 is a side elevational view of a carburetor and fuel pump structure embodying the present invention, FIG. 2 is an elevational view of the air introduction end of the carburetor shown in FIG. 1, and FIG. 4 is a bottom plan view of the carburetor shown in FIG. 1, FIG. 5 is an elevational view of the opposite side of the carburetor and fuel pump structure, and FIG. 6 is a top plan view of the carburetor shown in FIG. FIG. 7 is a cross-sectional view of the carburetor and fuel pump structure taken along line 7--7 of FIG. 4; , FIG. 8 is a longitudinal sectional view taken along line 8--8 of FIG. 7, FIG. 9 is a partial view of a view similar to FIG. 8 showing another device, and FIG. FIG. 11 is a detailed partial cross-sectional view taken along line 11-11 of FIG. 3; FIG. 12 is a partial cross-sectional view taken along line 10--10 of FIG.
13 is a partial detailed sectional view taken along the 4th line.
Detailed partial cross-sectional view taken along line 13-13 in Figure 1.
4 is a detailed partial cross-sectional view taken along line 14--14 in FIG. 4, FIG. 15 is a detailed partial cross-sectional view taken along line 15-15 in FIG. 4, and FIG. 17 is a partial sectional view of the structure shown in FIG. 7 showing an overspeed governor device for the engine; FIG. 18 is a partial sectional view of the structure shown in FIG. FIG. 19 is a view similar to FIG. 4 with the main body member and thin layer member of No. 2 removed, showing some arbitrary positions and positions of the air bleed passage of the fuel supply system for engine idling and low speed; FIG. FIG. 16 is a plan view of a laminate member of the same size as the laminate member shown in FIG. 16 and having another passage for fluid flow; FIG. a plan view of a laminar member having separate passages for fluid flow;
FIG. 21 is a plan view of a laminate member having the same size as the laminate member shown in FIG. 16 and having other passages for fluid flow; FIG. 22 is a plan view of the laminate member shown in FIG. 16; FIG. 23 is a bottom plan view similar to FIG. 4 of the carburetano and fuel pump structure, having other passageways for fluid passage and having the same dimensions as . 24 is a plan view of the thin layer member used in the carburetor of FIG. 23, and FIG. 25 is a thin layer member having the same size as the thin layer member shown in FIG. FIG. 26 is a plan view of a laminar member of the same size as the laminar member shown in FIG. 16 and having other passageways for passage of fluid therethrough; FIG. 27 is a cross-sectional view similar to FIG. 7 showing another shape of the carburetor body member; FIG. 28 is a plan view of the passageway in the body member and FIGS. 7 and 8 A sectional view showing air and fuel flow paths in the passages of the laminar member of the subordinate idling device of the device shown in FIG. 29, in the passages of the body member and independent of the device shown in FIG. FIG. 3 is a cross-sectional view showing the air and fuel flow paths in the passages of the laminated member of the idling device of FIG. 10... Carburetor, 11... Main body member, 12...
・Body member, 14, 14a to 14g... Thin layer member, 1
7... Mixing passage, 18... Air introduction area, 21...
・Mixture outlet area, 24... Bench lily member, 32・
...Air introduction area, 40...Mounting member, 69...
Fuel pump structure, 82... Fuel chamber, 126... Main orifice, 145... Passage.

Claims (1)

[Claims] 1 a fuel and air mixing passage 17 with an air inlet area 18, a mixture outlet area 21 and a vent lily 26 between said areas, a flat bottom surface 50, a main orifice 126 opening at one end into said vent lily and one end opening into said vent lily 26; a first body member 11 provided with at least one auxiliary orifice 149, 150 or 151 opening into the air-fuel mixture outlet area; A second main body member 12 provided with a supply chamber 82. A method for manufacturing a carburetor 10 comprising: a second main body member 12 provided with a supply chamber 82; Air bleed passages 166, 242, 244, and a passage having one end that can communicate with the air mixing passage via the engine speed governor 212 are formed, and the orifice, the auxiliary orifice, the air bleed passage, and the passage The other end is opened in the bottom surface at different positions, and the second main body member has four fluid passages 144, 159, 16, first to fourth.
8 and 234 to communicate a first fluid passage 144 with the fuel chamber via the first regulating valve 140 and a second
and the third fluid passages 159, 168 to the second regulating valve 1
56 and a fourth fluid passage in communication with the fuel chamber, one end of each of the fluid passages of the second body member being in communication with the planar upper surface of the second body member at a different location. opening the fluid passageway to the main orifice;
A plurality of apertures are formed for selective communication with the auxiliary orifice, the air bleed passageway, or the first body member passageway, such that the apertures provide different types of fluid connections between the fluid passageways. A plurality of thin layer members 14, 14a to 14g having different shapes are prepared, and one thin layer member selected from the first main body member, the second main body member, and the thin layer member is attached to the first main body member, the second main body member, and the thin layer member. A method of manufacturing a carburetor, characterized in that the carburetor is assembled by sandwiching the flat bottom surface of the main body member and the flat top surface of the second main body member.