FR3064309A3 - CARBURETOR PURGING - Google Patents

Abstract

A carburetor (11) includes a carburetor tank (12), a fuel supply pipe (23), a fuel bleed pipe (21) and a valve (20). The carburetor bowl (12) is configured to store fuel and supply the fuel to an air passage (25). The fuel supply pipe (23) is connected to a fuel tank (15) and to the carburetor tank (12). The fuel bleed pipe (21) is connected to the carburetor tank (12) and the fuel supply line (23). The valve (20) for the fuel purge pipe (21) is configured to open and close in response to an orientation of the carburetor (11).

Description

CARBURETOR PURGING

The present application claims the priority of the provisional application No. 62/477 154 filed March 27, 2017, which is incorporated herein by reference in its entirety.

The present disclosure generally relates to a carburettor or a device that mixes fuel and air for an internal combustion engine, and more specifically an apparatus and techniques for purging a tank of a carburettor to extract the fuel. stale fuel from the tank.

[0003] A carburetor regulates the speed and volume of the air sucked into an internal combustion engine, which controls the amount of fuel that is mixed with the air and supplied to the combustion chamber of the internal combustion engine. The carburetor may include a tank that contains a certain amount of fuel at any given moment when the engine is running so that the fuel is always available and ready for mixing with the airflow.

As a result of the fact that the fuel tank is still available for use, a certain amount of fuel can remain in the tank after the engine is no longer running. Fuel remaining in the tank for a long time may expire. Long periods can occur off-season, for example, when an engine is not used during the winter. Stale fuel can cause several problems. Stale fuel may lose its volatility and may not provide sufficient combustion for engine operation. The expired fuel can at least partially evaporate and leave behind sediments or residues that clog the carburetor components.

The apparatus and techniques described herein prevent or mitigate the effects of expired fuel in the tank of a carburetor.

The embodiments given by way of example are described here with reference to the following drawings.

[0007] Figure IA illustrates a side view of an engine including a carburetor.

Figure 1B illustrates a top view of the engine of Figure IA.

[0009] Figure 2 illustrates the engine mounted on a rotary lawn mower.

Figure 3A illustrates an example of a carburetor for a running condition.

Figure 3B illustrates an example of a valve for the carburettor of Figure 3A.

Figure 4A illustrates an example of a carburettor for a raised state.

Figure 4B illustrates an example valve for the carburetor of Figure 4A.

Figures 5A and 5B illustrate another example of a carburetor.

Figure 6 illustrates a cross section of the carburetor in an off-blow position.

Figure 7 illustrates a cross section of the carburetor and the engine inclined in a purge position.

Figures 8A and 8B illustrate the tank vent locations in the carburetor.

Figure 9A illustrates a top view of an engine including a booster pump.

Figure 9B illustrates a three-dimensional view of the engine including the booster pump.

Figure 10 illustrates a fuel recycling system mounted with a fan housing.

Figs. 11A and 11B illustrate three-dimensional views of the fuel recycling system mounted with a fan housing of Fig. 10.

Figure 12A illustrates a deactivated position of the return pump at the end of the discharge stroke.

Figure 12B illustrates an activated position of the booster pump at the end of the suction stroke.

Figure 13A illustrates the operation of the booster pump in the discharge stroke.

Figure 13B illustrates the operation of the booster pump in the suction stroke.

Figure 13C illustrates an exploded view of a booster pump.

Figure 13D illustrates a top view of the booster pump of Figure 13C and the fan housing.

Figures 14A and 14B illustrate the fuel recycling system mounted on the fuel tank of an engine.

Figures 15A and 15B illustrate another embodiment of a fuel recycling system.

Figures 16A and 16B illustrate a pump mounted with the fuel tank for the embodiment of Figures 15A and 15B.

Figures 17A and 17B illustrate detailed views for the pump mounted with the fuel tank.

FIG. 18 illustrates an exemplary flow chart for the operation of a purge of the carburettor controlled by the orientation.

[0033] Figure 19 illustrates an exemplary flowchart for a remotely actuated carburetor pump.

Figures 20A and 20B illustrate an engine including a recycling system using an enclosed fluid.

Figure 21 illustrates an example of a recycling system using a fluid enclosed in a first state.

Figure 22 illustrates an example of a recycling system using a fluid locked in a second state.

Figures 1A and 1B illustrate a motor 10. The engine 10 includes various components including a carburetor 11, a fuel tank 15, a booster starter 13, and an air filter compartment 14. Additional components, different or in smaller numbers may be included.

Figure 2 illustrates the engine 10 mounted on a rotary lawn mower 19 and a cross section of the fuel system where the carburettor fuel intake valve is open to allow the fuel to be vented from the tank to the fuel tank. fuel. A drive shaft 28 of the motor 10 may be coupled with a blade adapted to be rotated by the force of the motor 10 and cut grass or other vegetation. The rotary lawn mower is in a raised or storage orientation such that the lawn mower 19 is raised at one end. The raised or stored orientation places the wheels 29 of the lawn mower in a vertical orientation (for example, the front wheels are spaced vertically from the rear wheels) in contrast to a horizontal orientation (for example, the front wheels are spaced horizontally from the wheels). rear wheels) when the lawn mower 19 is in operation. In the raised or storage orientation, a support portion 24 (eg, support device) of the lawnmower 19 rests on, or is supported by, the floor or ground 22. The support portion 24 may be coupled or integrated with the handlebars or handles to push the lawn mower 19.

FIG. 3A illustrates an example of a carburettor 11 including an air passage 25, a carburetor tank 12, a fuel supply line 23, a carburettor bleed line 21 and a valve 20. The valve 20 is coupled to the carburettor purge pipe 21. Additional, different or fewer components may be included.

The air passage 25 is a pipe which receives a flow of air and which mixes the fuel from a fuel pipe to the air to bring the mixture of fuel and air to the engine 10. air passage 25 may include a narrow portion (e.g., a venturi tube), which increases the speed of the air flow and creates a vacuum (e.g., partial vacuum) or pressure that drives the fuel into the flow air to create the fuel and air mixture. The ratio of air to fuel can be adjusted by an upstream air valve (eg, throttle plate) in the upstream air passage in the direction of airflow from the fuel pipe. When the upstream air valve is in a more closed position, less air flow is present in the air passage 25 and / or relatively more fuel is drawn in by the low pressure, which leads to a lower ratio from air to fuel (for example, a mixture of fuel and richer air). When the upstream air valve is in a more closed position, less air flow is present in the air passage 25 and / or relatively more fuel is drawn in by the low pressure, which leads to a lower ratio from air to fuel (for example, a mixture of fuel and richer air). When the upstream air valve is more in an open position, a higher airflow is present in the air passage 25 and / or relatively less fuel is sucked in by the low pressure, which leads to a higher air ratio. air from the fuel (for example, fuel mixture and poorer air).

The ratio of air to fuel can be adjusted by a downstream air valve (eg, throttle valve) in the downstream air passage in the direction of airflow from the fuel pipe. Since the downstream air valve is more in an open position, more air flows through the air passage 25, drawing more fuel, and a larger volume of fuel and air mixture is removed. supplied to the engine 10.

The fuel pipe of the carburetor 11 connects the air passage 25 to the carburetor tank 12. The carburetor tank 12 is connected to a fuel supply line 23 which is connected to a fuel tank and receives a supply of fuel from it. The carburetor tank 12 may be a float-fed chamber that includes a float and a valve. The float is connected to the valve. The float has a lower density than the fuel. As the fuel level in the carburetor tank 12 decreases, due to the fuel supply to the fuel pipe and to finish at the engine 10, the float moves and actuates the valve (for example, opens the valve) with 25. When the valve is actuated, more fuel flows from the fuel supply line 25 to the carburetor tank 12. As the carburetor tank 12 fills, or when it is filled, the float rises, closes the valve, and the supply of fuel to the carburetor tank 12 stops again.

The carburetor 11 also includes a secondary fuel line (e.g., carburetor bleed line 21) and a secondary valve (e.g., valve 20). The carburettor bleed line 21 and the valve 20 are configured to bleed fuel from the carburetor tank 12. The carburettor bleed line 21 and the valve 20 can bleed the carburetor tank 12 when the engine 10 is not in position. in a running state. Carburetor bleed line 21 and valve 20 can bleed expired fuel or non-combustible fuel from carburetor tank 12. Carburetor bleed line 21 and valve 20 can bleed carburetor tank 12 when engine 10 is vented. is in a predetermined orientation. The orientation may be an orientation other than right. The orientation may be a storage orientation or a raised orientation (for example, for the lawnmower 19).

The expired or non-combustible fuel may have a volatility below a threshold value. Fuel volatility can be measured in Reid vapor pressure or an absolute vapor pressure of a chamber including fuel that has not been exhausted. Fuel volatility may be inversely proportional to vapor pressure

Reid. The absolute vapor pressure increases due to factors such as time and heat. Starting an engine is more difficult when the absolute vapor pressure increases.

Figure 3A illustrates an example of a carburettor in an operating orientation. Figure 4A illustrates the carburetor example in a raised or storage orientation.

A storage orientation or a raised orientation can occur when an apparatus including the motor 10 is stored in a different orientation than when in use or in operation with the motor 10 running. In one example, the storage orientation is vertical and the operation orientation is horizontal. In the example of a lawn mower, more than two wheels (for example, three or four wheels) can rest on the ground in the operating orientation and two or fewer wheels can rest on the ground in the orientation of storage. The lawn mower may include a third (or more) support point for additional support. The additional support can be coupled with the lawnmower and a support device integrated in the lawn mower. The additional support may be rotatable around one or more of the wheels. The storage orientation may have a footprint smaller than the operating orientation. For example, the space in a horizontal plane (for example, the plane perpendicular to the direction of gravity) required by the device in the storage orientation is less than the space in the horizontal plane required by the device in the orientation of operation. Examples other than a lawn mower include all-terrain vehicles, golf carts, garden equipment or other small-engine wheeled devices.

FIG. 3B illustrates an example of a valve 20. The valve 20 may include a non-return ball 121, a pocket or a passage 123, and a stopper 125. The valve 20 may be a non-return valve adapted to allow a flow in a direction and not the other direction. For example, the valve may allow flow from the carburetor tank 12 but not to the carburetor tank 12. Additional, different or lesser components may be included, and a variety of check valves or other types of valves may be included. be used in place of the valve shown in Figure 3B.

The valve 20 uses gravity to move the non-return ball 121 on a sealing surface or seat 124 from a position to stop the flow in a direction as in Figure 3B, at a position, typically at 90 degrees. the flow stop direction, where the gravity causes the non-return ball to move into a pocket or passage 123 outside the main flow passage 126 to allow the fluid to flow. A plug 125 has a semi-spherical surface for placing the ball in the flow position. The plug 125 provides a method for forming the sealing seat 124 in the valve body 20.

In a variation of the exemplary check valve shown in FIG. 3B, a tilting lid type check valve can perform a similar function. The tilting lid may include a hinge that allows a shutter to open and close in the flow direction.

Valve 20 may be a gravity-controlled check valve (eg, gravity sensing device) that allows flow in one direction only in a particular gravity orientation. The valve 20 may operate or be operated in response to gravity. When the valve 20 (and the carburetor 11) is in a first orientation, the valve 20 is in a first state (eg, open state), and when the valve 20 (and the carburetor 11) is in a second orientation, the valve 20 is in a second state (e.g., closed state). When the apparatus is in the storage orientation, the valve 20 may be in the open state, and when the apparatus is in the operating orientation, the valve 20 may be in the closed state. A gravity sensing device such as the check valve in Figure 3B may be the most cost effective and efficient option compared to other types of valves.

In the open state, as shown in FIG. 4A, the valve 20, as illustrated in greater detail in FIG. 4B, can connect the bleed line 21 to the fuel supply line 23. The illustrated valve uses gravity to move the check ball 121 on a sealing surface or seat 124 from a position to stop the flow in a direction as in Figure 3B at a position about 90 degrees from the direction. stopping flow, where the gravity causes the non-return ball to move in a pocket or passage 123 outside the main flow passage 126 to allow the fluid to flow. A plug 125 has a semi-spherical surface for placing the ball in the flow position. The plug 125 provides a method for forming the sealing seat 124 in the valve body 20.

Following the operation of the valve 20, the fuel from the carburetor tank 12 is returned to the fuel supply line 23 through the valve 20. Part of the fuel from the carburetor tank 12 can return in the fuel tank 27. When the fuel is returned to the fuel supply line 23, during a subsequent operation of the engine 10 where the engine is oriented in the operating position, any potential stale fuel will be mixed with, or when diluted with fresh fuel in the fuel supply line 23. When the fuel is returned to the fuel tank 27, in a subsequent storage orientation of the engine 10, any potential expired fuel will be mixed with, or diluted by the fresh fuel in the fuel tank 27. Therefore, following the operation of the valve 20 connecting the bleed line 23 to the fuel line 23, the fuel which normally or typically would remain in the carburetor tank 12 for a long time and may become less volatile is now automatically purged. Namely, the carburetor tank 12 is automatically purged and filled to increase fuel volatility in the carburetor tank 12.

Figures 5A and 5B illustrate an example of a carburetor. A fuel intake nipple 410 provides fuel to the carburetor bowl. A needle 411 has a tapered diameter for measuring the amount of fuel released into the air passage. Figures 5A and 5B include a location of the fuel admission valve that does not allow the fuel to be fully purged from the tank in the raised condition. Figure 5B also illustrates the main air flow through the carburettor which passes through a venturi passage 421 having a lower cross-sectional area which reduces the air pressure in the flow to draw fuel into the main chamber for mix with the air flow.

Figure 6 illustrates a cross section of the carburetor including the location of the fuel admission needle when tilted. The fuel in the carburetor tank can not be purged through the intake needle. Part of the fuel is purged by the passage of the tank vent 510 and discharges outside the engine. Figure 6 illustrates a cross section which shows the fuel admission valve in a position where the fuel is not fully purged from the carburetor bowl.

Figure 7 illustrates a cross section of the carburettor including the fuel inlet needle located at a low point when the engine is tilted to allow fuel to return to the fuel tank. A vessel vent 521 is provided to prevent the fuel from being uncontrollably purged from the vessel.

[0056] FIG. 6 illustrates an example of a carburettor with the float tilted perpendicular to the inclined angle so that the movement is not affected by gravity to move it to a position allowing the admission needle to be opened. fuel 411. Figure 7 illustrates the carburettor in which the orientation of the float hinge promotes float movement due to the tilt angle of the carburetor. A rotating float mechanism with the fuel admission valve configured to allow all fuel to be purged from the tank when tilted. Figure 6 illustrates the carburettor in a normal or operating orientation with the axis of the nipple 413 in the horizontal plane (eg, perpendicular to gravity) or below a predetermined angle to the horizontal plane. Figure 7 illustrates the carburettor in an inclined orientation with the axis of the nipple 413 in the vertical plane (for example, parallel to gravity) or at a predetermined angle with the vertical plane or greater than a predetermined angle with respect to the horizontal plane .

In Figures 6 and 7, the fuel inlet valve 411 is reoriented with respect to a typical carburettor to a position in which when the carburetor is inclined, the intake needle is at the lowest point fuel tank. This allows all of the fuel to return to the fuel tank through the bleed line 413. In the normal location of the intake needle, a certain amount of fuel can be trapped. This trapped fuel would eventually create sticky deposits by evaporating.

When the carburetor is rotated from normal rotation in Figure 6 to the inclined orientation in Figure 7, the fuel tank 412 is rotated relative to the carburetor. The fuel tank 412 is supported by a pivot 414, which may include a rotatable coupling with the carburetor housing.

The fuel tank 412 rotates around the center of the fuel tank. The center of thrust is analogous to the center of mass of a volume, for example the center of thrust of a sphere is the center of the sphere. A rigid link attached to the sphere and attached to the other end of the link at the edge of a fluid container with a hinge, the sphere would rotate about the hinge relative to the fluid level. If the sphere was fully submerged, the sphere would be just above the joint. In the embodiments of

Figures 6 and 7, the float dislodges the fuel inlet needle when the carburetor is tilted due to two factors. One factor is the shifting of the center of thrust to start the rotation of the float away from the closed position of the intake needle when the carburetor bowl is filled. The other factor is the effect of gravity to keep the float rotating relative to the open position of the intake needle when the fuel is purged past the point where the float is floating.

Figures 8A and 8B illustrate the tank vent locations in the carburetor. Figure 8A includes a cross section showing the location of the fuel admission needle 531 when tilted. The fuel in the tank can not be purged via the intake needle. Part of the fuel is purged by the tank vent 521 and discharges the engine outside.

In Figure 8B the fuel inlet needle located at a low point when engine is inclined to allow fuel to return to the fuel tank. The tank vent located above the fuel level when the carburetor is tilted to prevent the fuel from being purged uncontrollably from the tank.

Another technique for extracting fuel from a carburetor tank includes an alternative pump (for example, mechanically actuated diaphragm pump), actuated by a return-start device, to rinse or purge the carburetor tank. Other examples may include a piston pump, a peristaltic pump that is actuated by the recoil starter, a rotary element pump that may be gear, gerotor or paddle type, or an alternator pump powered by an electric starter. . Figure 9A illustrates a top view of a motor 310 including a return pump 200, and Figure 9B illustrates a three-dimensional view of the motor 310 including the return pump 200.

In a variant (not shown) of the return pump 200 and the booster device, or an actuation powered by the booster device, a pump can be powered by an electric starter to fill the Purge function for the carburetor tank. When the electric starter is turned on, the pumping function starts. When the engine starts, and the starter returns to an off state, the pumping function stops. The action of a starter gear gear, extending from its home position, may cause an alternative type pump to purge the carburetor bowl.

Figure 10 illustrates a fuel recycling system mounted with a fan housing including a return pump 200 or a pump mounted on a return starter 200. Figures 11A and 11B illustrate three-dimensional views of the housing of fan mounted on a similar fuel recycling system.

The return pump 200 may be used in combination with the valve 20 or as an alternative to the valve 20. The return pump 200 can pump fuel from the carburetor tank 12 through a bleed line 221 to the return pump 200 and through a return line 224 from the return pump 200 to the fuel tank, which is illustrated behind the fuel plug connection opening 226. The return pump 200 can be actuated by the pulley The starter return pulley 213 may include one or more projections 211 that engage the return pump 200. The projections 211 may be lobes or cams. The protrusions 211 may take various other forms. Two projections are shown in Figure 10, and a system with five projections is illustrated in Figures 11A and 11B. Any number of protrusions can be used.

As described above, the fuel present in the carburetor tank 12, provided by a fuel line 223 from the fuel tank, may become obsolete over time. When the engine 10 is then started, by pulling on the starter handle 277 (starter rope not shown), the starter return pulley 213 rotates and one or more of the projections 211 come into contact and lose contact with the booster pump. 200. Actuation of the return pump 200 sucks the expired fuel from the carburetor tank 12 through the bleed line 221. The fresh fuel flows through the fuel line from the fuel tank into the tank. carburetor to provide a better mixture of air and fuel from the engine.

FIG. 12A illustrates the fully discharged position of the return pump 200. FIG. 12B illustrates the end of suction stroke position of the return pump 200.

The return pump 200 may include a cam follower arm 101, a hard point assembly 105, a diaphragm 107, a conical spring 109 in a pump chamber 111, a check valve 113, an outlet pipe 115 to the fuel tank or a fuel supply line, and an intake pipe 117 (not shown in Figures 12A and 12B) from the carburetor tank. In one example, an intermediate cantilever lever is located between the cam follower arm 101 and the hard dot assembly 105. Additional, different, or fewer components may be included.

The cam follower arm 101 may be in contact with one or more projections 311 on the starter return device 313. When the starter return device 313 rotates, a projection 311 is brought into contact with the follower arm. cam 101, under the effect of a displacement force illustrated by the arrow A1, which causes the cam follower arm 101 to move from a deactivated state (for example, suction phase) illustrated in FIG. 12B to FIG. activated state (eg, discharge phase) shown in Figure 12A.

When lowered, the cam follower arm 101 applies a lever force illustrated by the arrow A2 is on the intermediate cantilever lever if necessary, or directly on the whole hard point 105 when the intermediate cantilever lever is not included. The intermediate cantilever lever, if any, stabilizes the assembly.

The hard point assembly 105 receives the force exerted by the cam follower arm 101 or the intermediate cantilever lever. The hard point assembly 105 is connected to the diaphragm 107 and the conical spring 109. The hard point assembly 105 distributes the force exerted by the cam follower arm to the diaphragm 107 through the pump chamber 111 to distribute the force of the homogeneously to lower the diaphragm 107 and the conical spring 109.

The conical spring 109 is adjacent to the check valve 113. The conical spring 109 compresses to reduce the size of the pump chamber 111 to eject the fuel through the check valve 113 through the outlet pipe 115 and relaxes or relaxes to increase the size of the pump chamber 111 to draw fuel from the intake pipe 117. The fuel in the pump chamber 111 can enter the return pump 200 through a compartment with an outside diameter before flowing into the pump chamber 111. The conical spring 109 goes from released to compressed each time the cam follower arm 101 is put into operation by the projection 311.

The conical spring 109 can return to the relaxed state by virtue of the energy stored in the conical spring 109 and apply a spring force as illustrated by the arrow A3 on the cam follower arm 101. The follower arm cam 101 provides a lever force illustrated by the arrow A4 to push the cam follower arm 101 against the projections 311 on the starter return device 313.

The check valve 113 may include a duckbill valve having a central section in the form of a shell or duckbill. Under pressure, the check valve 113 opens to allow flow of fuel through the check valve 113. The check valve 113 can be replaced by two ball and spring check valves, flap valves or other non-return valve devices.

The cam follower arm 101, which may be referred to as the swingarm, provides a leverage between the force received by the projection 311 and the force applied to the conical spring 109. In other words, a distance applied by projection 311, which may be the height of protrusion 311, is less than a compression distance applied to conical spring 109. Cam follower arm 101 may function as a lever which translates a first distance of the projection 311 at a second distance from the conical spring 109, with the first distance being less than the second distance. The cam follower arm 101 provides more stroke to the pump with lower booster lift. In one example, the projection 311 has a depth of 1 to 3 millimeters and the lowering distance of the conical spring 109 is 5 to 10 millimeters.

The projections 211 come into contact with the return pump 200 at the cam follower arm 101 in Figures 12A and 12B and, alternatively, at the roller 213 shown in Figure 10. The roller 213 and the cam surface of the cam follower arm 101 are interchangeable. The cam surface of the follower arm 101 may be referred to as the sliding piston. In some instances, the cam surface may be preferable to reduce the number of moving parts of the system. In some examples, the roller 213 may be preferable since the sliding piston creates friction and generates wear. In some scenarios, the force exerted by the lever of the cam follower pump 101 may be greater than the return force of the spring upon return, which hinders or prevents winding of the return device after a pull. The roller 213 can reduce this friction to allow the return device to function properly. In some examples, the roller 213 may be added to the cam follower arm 101. In this manner, if the roller 213 is damaged and is removed or if it falls, the cam surface of the cam follower arm 101 remains. The recoil starter is configured to simultaneously start the engine and operate the pump. The term simultaneously may mean within a predetermined time (for example, 1 to 5 seconds) or within the same action (eg, starter pull).

Figures 13A and 13B further illustrate the operation of the booster pump. As shown by arrow A5, the fuel under pressure flows through the duckbill. As represented by the arrow A6, the fuel is expelled from the pump chamber through the outlet pipe 115. When the conical spring returns to the relaxed state, the fuel is sucked into the intake pipe 117, as represented by the arrow A7, and in the pump chamber, as represented by the arrow A8.

FIG. 13C illustrates an exploded view of a return pump 200. The return pump 200 may include a follower arm 141, a diaphragm 107, a connecting rod 214, a conical spring 109 and a support bearing 215. The pump chamber 210 is formed between the valve assembly 210 and the diaphragm 107. The valve assembly 210 may include various types of valves, and the illustrated example includes shut-off balls 208 and non-return balls 209 for an outlet pipe. 117 to the fuel tank or a fuel supply line and an inlet pipe 115. The sealing balls 208 and the non-return balls 209 may be formed of metal or steel. Other types of check valves or flapper valves having a tongue of material (eg rubber or Mylar). Additional, different or fewer components may be included. Figure 13D illustrates a top view of the booster pump of Figure 13C and the fan housing.

In the examples of FIGS. 13A and 13B, the cam follower arm 101 is actuated and in order to eject the fuel from the chamber 111, and the energy stored in the spring 109 draws the fuel into the chamber 111. In some examples, depending on the speed of the booster and the number of protrusions, the movement of this arrangement may be too fast to allow the fuel to be sucked into and / or ejected from the chamber 111.

Alternatively, in the example of Figures 13C and 13D, the follower arm 141 is actuated by the movement of the roller 213 along the projections to suck fuel into the chamber 111, and the energy stored in the spring 109 ejects the fuel from the chamber 111. That is, the spring 109 is connected to the diaphragm 107 and urged to push the diaphragm 107 into the chamber 111, which expels the fuel from the chamber 111. The rod 214 is also connected to the diaphragm 107 at one end and the follower arm 141 at the other end. When the follower arm 141 moves in response to the rolling of the roller 212 on the convex portion of the projection, the rod 214 pulls on the diaphragm 107 to draw fuel into the chamber 111. When the roller 212 moves to a portion concave of the projection, the rod 214 no longer pulls on the diaphragm 107, which allows the force stored in the spring 107 to push the diaphragm 107 in the chamber 111, which expels the fuel from the chamber 111.

In this example, even if the roller 212, the follower arm 141 and the rod 214 oscillate quickly, the process is not disturbed. The diaphragm 107 applies a small force in a direction away from the return pump 200. If the chamber 111 is empty, the diaphragm 107 and the connecting rod 214 hold the follower arm 141 so that the arm 141 does not come In consequence, when the fuel leaves the chamber 11, the roller 212 does not come into contact with the cam before a specific volume of fuel has left the chamber 111. When the roller 212 n is not in contact with the protrusions 211, no force or torque is applied to the return. Thus, the roller 212, the follower arm 141 and the rod 214 are in a neutral or floating state.

Figures 14A and 14B illustrate the fuel recycling system including the pump 200 mounted with the fuel tank on an engine.

Figures 15A and 15B illustrate another embodiment of a fuel recycling system. In this embodiment, the return pump 200 is mounted directly on the fuel tank 240. Figures 16A and 16B illustrate a pump mounted with the fuel tank for the embodiment of Figures 15A and 15B.

Figures 17A and 17B illustrate detailed views for the pump mounted with the fuel tank 300. An advantage of the pump mounted with the fuel tank is that the pump outlet hose is no longer needed. The discharge port opens directly into the fuel tank.

The pump mounted with the fuel tank includes a conical spring 109, a diaphragm 107, a lever 251, a cam follower 250, an outlet 253 for the check valve and an inlet 255 for the check valve. The cam follower 250 receives a force in a first direction exerted by the cam lobes of the started recall. The force in the first direction is translated in a second direction through the lever 251. The second force is applied to the pump piston, which has lowered the conical spring 109 and the diaphragm 107, which changes the size of the pump cavity to expel the fuel through the outlet 253 and draw new fuel through the inlet 255 into the check valve.

FIG. 18 illustrates an exemplary flowchart for the operation of a purge of the carburettor controlled by the orientation. Additional, different or fewer actions may be included.

In Action S101, a first fuel path is provided to a carburettor in a first orientation of an engine. The first orientation of the engine may be the operating orientation of the engine. For example, when the motor is included on a wheeled device, the operating orientation is the orientation in which all or a majority of the wheels rest on the ground or in a plane substantially perpendicular to the direction of gravity.

At Action S103, the engine including the carburetor is moved or moved from the first orientation to a second orientation. In one example, the motor can be mounted on a wheel machine that is placed in a storage position. For example, the wheel machine can be raised to be stored in an orientation perpendicular to an operating orientation or suspended from a wall or post in the orientation perpendicular to the operating position.

At Action S103, a purge path from the carburetor in the second orientation of the engine. The purge path can be opened through a check valve. The bleed path may allow fuel to flow through the bleed path from the carburetor back to the engine fuel tank. The purge path may be referred to as the return path.

[0090] Figure 19 illustrates an exemplary flowchart for a remotely actuated carburetor pump. Additional, different or fewer actions may be included.

At Action S201, a force is received at the return-actuated carburettor purge pump exerted by a protrusion on a recoil starter. The booster starter may include projections or lobes that are spaced apart from each other. When the recoil starter rotates, the protrusions come into contact and lose contact with the reciprocating carburetor pump.

In Action S203, the remotely-actuated carburettor purge pump translates the force of a first distance based on a dimension of the protrusion at a second distance. For example, the reciprocating carburettor bleed pump may include a lever in which the ratio of the lever arms is proportional to the first distance and the second distance.

At Action S205, the reciprocating carburettor bleed pump exerts a force for the second distance to compress a pump spring. As a result of the compression of the pump spring, the reciprocating carburettor bleed pump is activated to purge the fuel from a carburettor, as represented by Action S207.

The small internal combustion engine may be applicable to chainsaws, mowers, wood choppers, stump grinders, trowels, miniature excavators, concrete cutters, portable sawmills, lawn trimmers, all terrain vehicles, wood turnbuckles, high pressure cleaners, tillers, tractors, plows, snow blowers, welding equipment, generators and other devices.

The engine 10 may include a cylinder, two cylinders or another number of cylinders. The one or more cylinders can generate noise or sound waves as a result of oscillations of one or more pistons through the one or more cylinders, which are shaped to receive the one or more pistons. The one or more pistons can be guided through the one or more cylinders by a push rod which is connected to a crankshaft by a crank pin. A combustion chamber includes a combustion chamber adjacent to a piston head. The combustion chamber is formed in a cylinder head. In a phase of a combustion cycle for the piston, the exhaust port is isolated from the combustion chamber by the piston, and in a subsequent phase, the exhaust port is in gas communication with the chamber. combustion to release the exhaust gas through the exhaust port to a silencer.

[0096] The terms "coupled with" or "coupled to" include directly connected to or indirectly connected through one or more intermediate components. Additional, different or fewer components may be provided. Additional, different or fewer components may be included.

The actions of FIG. 18 may be initiated by one or more controllers including a specialized processor, one or more memories and a communication interface. One or more controllers may operate the check valve by generating opening and closing commands for the check valve. The opening and closing commands can be generated in response to data from a sensor (e.g., magnetic sensor or gravity sensor) that describes the motor orientation. Instructions for one or more controllers may be embedded on a non-transitory computer readable medium.

The remotely actuated carburettor bleed pump can be controlled by one or more controllers including a specialized processor, one or more memories and a communication interface. One or more controllers can activate or deactivate the booster carburetor pump. The one or more controllers may generate an activation command when the carburetor is to be purged. For example, the controller may determine when a predetermined time (for example, a week or less) has elapsed. The predetermined time can be chosen so that the purge pump is actuated after the engine is stored. Instructions for one or more controllers may be embedded on a non-transitory computer readable medium.

Figures 20A and 20B illustrate a motor 601 including a recycling system 600 using an enclosed fluid. Figure 21 illustrates an example of a recycling system 600 using a fluid locked in a first state. Figure 22 illustrates an example of a recycling system 600 using a fluid locked in a second state. The recycling system 600 can pump fuel from the carburetor tank 612 through a bleed line 621 to the recycle system 600 and through a return line 624 from the recycle system 200 to the reservoir. 630. The recycling system 600 may include no mechanical parts for driving the pump. Instead, the diaphragm 607 pumps fuel by the action of gas expansion. Additional, different or fewer components may be included.

The recycling system 600 may include two or more chambers such as a fuel chamber 611 and a fluid chamber 610 integrated within a single device and separated by a diaphragm 607. The diaphragm 607 may be formed of rubber, plastic, or other durable but flexible material. The fluid chamber 610 includes a fluid that expands and contracts in response to the ambient environment. For example, fluid can expand and contract in response to changes in temperature. The recycling system 600 may be placed near (for example, within a predetermined distance) a heat source such as a silencer 640. In some examples, the fuel chamber 611 and the fluid chamber 610 are separated. The fluid chamber 610 may be spaced from the recycling system 600 and provide fluid to a third chamber in communication with the fuel chamber 611.

The fuel chamber 611 includes a bleed line 621 to the carburetor tank and the return line 624 to the fuel tank. A check valve 620 may include a plug 608 and a check ball 609. The check valve 620 directs the flow of fuel from the carburetor bowl to the fuel tank 630. The cap 608 may provide a through hole for the ball The stop 608 limits the distance that the anti-return ball 609 can travel through the cavity. In Fig. 21, the check ball 609 is in the home position in which the fuel is expelled from the fuel chamber 611. In Fig. 22, the check ball 609 is in an intake flow position. The check ball 609 may be a return purge portion of the check valve 620 which regulates the flow of fuel from the carburetor and prevents the return of fuel to the carburetor tank from the recycling system 600. The check ball 609 may be a fuel shut-off valve portion of the check valve 620 which regulates the flow of fuel to the fuel tank 630 and prevents the flow of fuel from the fuel tank to the recycling system 600. Alternatively, a ribbon valve or another type of valve may be used for either or both of the purge return portion or the fuel shutoff portion.

[00102] The fluid can be any gas or liquid. The fluid can be dry air. Other examples of fluids may include air, helium, oil or water. The fluid chamber 610 is isolated from the ambient environment and the fuel chamber 611. The air chamber 610 can not be connected to any tube and be isolated from all other components. The recycling system 600 operates on the principle of thermal expansion of gases. Thus, the fluid in the fluid chamber 610 has a first volume and a first temperature and a second volume at a second temperature, the first volume being greater than the second volume and the first temperature being greater than the second temperature.

For example, Figure 21 illustrates a state of the recycling system 600 in which the fluid in the fluid chamber 610 has expanded, for example, due to the heat caused by the operation of the engine 600. Spring 609 has stored energy that exerts a force on the diaphragm 607 in a direction that causes the diaphragm 607 to reduce the size of the fluid chamber 610 (for example, to the left in Figure 21). However, since the fluid is dilated, the fluid prevents the diaphragm 607 from compressing the fluid. In this way, when the engine 600 is running, the fluid in the fluid chamber 610 expands and pushes the diaphragm 607 and the spring 609 toward the check valve 620, causing the check valve 620 to open a path of the chamber fuel 611 to the fuel tank and pushing the fuel in the fuel chamber 611 into the fuel tank 630.

However, when the fluid cools, the fluid occupies less space, which allows the spring 608 to bring the diaphragm 607 into the space previously occupied by the fluid. Figure 22 illustrates a state of the recycling system 600 in which the fluid in the fluid chamber 610 has compressed, for example, due to the cooling of the engine 600 (ie, not started for some time) . The diaphragm 607 and the spring 609 create a vacuum to draw fuel from the carburetor tank for storage.

Compression of the fluid chamber 610 allows the expansion of the fuel chamber 611 and causes the check valve 620 to open a path from the carburetor tank to the fuel chamber 611. The fuel shutoff valve portion of the The non-return valve 620 also prevents fuel from the fuel tank 630 from being drawn into the fuel chamber 611.

When the engine 600 is started the next time and heats up, the fluid in the fluid chamber 610 warms up again, pushes the diaphragm 607 to the right, the fuel shutoff valve portion of the check valve 620 is opened, and the stored fuel (originally from the carburetor tank) is introduced into the fuel tank 630.

The fluid chamber 610 may include a spacer 650 as a device restricting the path of the diaphragm to maintain a minimum fluid volume in the chamber 610. The spacer 650 provides an exact volume of fluid during assembly of the fluid. the pump or recycling system 600 and also prevents the diaphragm 607 from adhering to the wall of the inner chamber during extended engine storage periods. The spacer 650 may be formed of metal, plastic or other material safe for prolonged exposure to the fuel. The dimensions of the spacer 650 may be selected as a predetermined proportion or fraction of the fluid chamber 610 or the carburetor bowl.

In addition to a predetermined distance from the muffler 640 as shown in Figures 20A and 20B, the recycling system 600 may be attached to the motor 601 in a variety of locations. The recycling system 600 may be an integral part of a heat shield 641 for the silencer 640. The recycling system 600 may be installed near the silencer 640 or other heat-producing component using a bracket. The size (for example, thickness) of the bracket and / or the number of holes in the bracket may be adjusted to alter the heat flow of the components producing heat to the recycling system 600. The recycling system 600 can be mounted near the outlet side of the coolant system where hot air is released by the engine. The recycling system 600 can be mounted near the crankcase, which also heats up during engine operation. Other locations for the 600 recycling system are possible.

[00108] In another example, the recycling system 600 can be mounted near a heat pipe. The heat pipe allows heat to pass from the heat producing element to the crosslinking system 600. The heat pipe has a high thermal conductivity.

In another example, the exhaust products can be routed from the silencer 640 to the recycling system 600 using a tube. The exhaust products retain heat, which causes the fluid to expand into the recycling system 600.

In another example, the recycling system 600 includes an auxiliary heat source (for example, a battery-powered heating element) that heats up in response to engine running. The auxiliary heat source can be connected to the engine battery. The auxiliary heat source heats the fluid in the fluid chamber 610.

The illustrations of the embodiments described herein are intended to provide a general understanding of the structure of the various embodiments. The illustrations are not intended to serve as a complete description of all features and features of the equipment and systems that utilize the structures or processes described herein. Many other embodiments may be apparent to those skilled in the art upon review of the disclosure. Other embodiments may be used and inferred from the disclosure, such as structural and logical substitutions and changes may be made without departing from the scope of the disclosure. Furthermore, the illustrations are simply representative and may not be drawn to scale. Some proportions within the illustrations may be exaggerated, while other proportions may be minimized. Accordingly, the disclosure and figures should be considered illustrative rather than restrictive.

While the present specification contains many specificities, these should not be construed as limiting the scope of the invention or claims, but rather as descriptions of features specific to particular embodiments of the invention. 'invention. Certain features that are described in this specification in the context of separate embodiments may also be implemented in combination within the same embodiment. Conversely, various features that are described in the context of the same embodiment can also be implemented in multiple embodiments separately or in any suitable sub-combination. Moreover, although the features may be described above as acting in certain combinations and even initially claimed as such, one or more features of a claimed combination may in some cases be excluded from the combination, and the claimed combination may be oriented towards a sub-combination or a variation of a sub-combination.

[00113] Similarly, while the operations are shown in the drawings and described here in a particular order, it should not be understood that these operations must be performed in the particular order indicated or successively, or that all operations illustrated must be done to achieve desirable results. In some circumstances, multitasking and parallel processing may be advantageous. In addition, the separation of the various components of the system in the embodiments described above should not be interpreted as requiring such separation in all embodiments, and it is understood that the software components and systems described can generally be integrated together in a single software product or in the form of multiple software products.

One or more embodiments of the disclosure may be designated herein, individually and / or collectively, by the term "invention" simply for the sake of convenience and without voluntarily limiting the scope of this application to any particular invention or invention. to any particular inventive concept. In addition, although specific embodiments have been illustrated and described herein, it should be appreciated that any subsequent arrangement designed to achieve the same or similar purpose may replace the specific embodiments presented. The present disclosure is intended to cover any subsequent adaptations or variations of the various embodiments. Combinations of the above embodiments, and other embodiments not specifically described herein, will be apparent to those skilled in the art upon review of the specification.

The foregoing detailed description should be considered illustrative rather than limiting and it is understood that the following claims including all equivalents are intended to define the scope of the invention. The claims shall not be considered to be limited to the order or elements described unless otherwise specified. Therefore, all embodiments within the scope and spirit of the following claims and the equivalents thereof are claimed to be the invention.

Claims (40)

A carburetor (11) comprising: a carburetor tank (12) configured to store fuel and supply the fuel to an air passage (25); a fuel supply pipe (23) connected to a fuel tank (15) and to the carburetor tank (12); a fuel purge pipe (21) connected to the carburetor tank (12) and the fuel supply line (23); and a valve (20) for the fuel purge pipe (21) configured to open and close in response to an orientation of the carburetor (11). The carburettor (11) according to claim 1, wherein the valve (20) opens when the orientation of the carburetor (11) is in a storage orientation. The carburettor (11) according to claim 1, wherein the valve (20) closes when the orientation of the carburettor (11) is in an operating orientation. The carburettor (11) of claim 1, wherein the valve (20) opens or closes in response to a force of gravity. The carburettor (11) according to claim 1, wherein the fuel purge pipe (21) is configured to purge the expired fuel from the carburetor tank (12). The carburettor (11) according to claim 1, wherein the valve (20) opens depending on the orientation of a lawn mower (19) which includes the carburetor (11). A machine on wheels comprising: a motor (10); and a carburetor (11) comprising: a carburetor tank (12) configured to store fuel and supply the fuel to an air passage (25); a fuel supply pipe (23) connected to a fuel tank (15) and to the carburetor tank (12); a fuel purge pipe (21) connected to the carburetor tank (12) and the fuel supply line (23); and a valve (20) for the fuel purge pipe (21) configured to open and close in response to an orientation. The wheeled machine according to claim 7, further comprising: a support device for supporting the engine (10) in a storage orientation different from an operating orientation of the engine (10). The wheeled machine according to claim 7, further comprising: a fuel tank (15) coupled to the fuel bleed pipe (21) and configured to receive fuel from the carburetor tank (12). An engine (10) including: a carburetor (11); a booster starter (13) including at least one projection (211); a follower arm (101) configured to contact the at least one projection (211); and a pump actuated by the cam follower arm (101) in response to rotation of the recoil starter (13). The motor (10) of claim 10, further comprising: a spring (109) in the pump (200) for receiving and storing a force exerted by the follower arm (101). The engine (10) of claim 11, further comprising: a diaphragm (607) connected to the spring (109), wherein the spring (109) is urged to urge the diaphragm (607) to expel fuel from the pump (200). The motor (10) according to claim 12, wherein when the pump (200) is empty, the diaphragm (607) pushes the follower arm (101) into a neutral position without contact with the at least one protrusion (211) . The engine (10) of claim 12, further comprising: a link (214) connected to the spring (109) and the follower arm (101), wherein the link (214) is configured to pull the diaphragm (607) for drawing fuel into the pump (200). The motor (10) of claim 11, further comprising: a chamber (111) in the pump (200) configured to change size in accordance with the movement of the spring (109). The engine (10) according to claim 10, wherein the pump (200) pumps fuel from the carburetor (11) to a fuel tank (15), carburetor (11) to the pump (200), carburetor ( 11) to the fuel tank (15), or any combination thereof. The engine (10) of claim 10, wherein the follower arm (101) includes a cam surface that is in contact with the at least one projection (211). The engine (10) of claim 10, wherein a force applied to the follower arm (101) at a first distance from the at least one projection (211) is translated at a second distance to activate the pump (200). . The engine (10) of claim 10, further comprising: a roller (212) connected to the follower arm (101) and configured to engage the at least one projection (211). The engine (10) of claim 10, wherein the recoil starter (13) is configured to simultaneously start the engine (10) and operate the pump (200). A method comprising: receiving a force exerted by a protrusion (211) on a recoil starter (13); translating the force of a first distance based on a dimension of the projection (211) at a second distance; providing a force for the second distance to a pump (200); and purging fuel from a carburettor (11) in response to the pump (200). The method of claim 21, further comprising: pumping the fuel to a fuel tank (15) in response to the pump (200). The method of claim 21, wherein receiving a force exerted by a projection (211) comprises: rotating a wheel (29) along the protrusion (211) of the starter (13). The method of claim 21, further comprising: opening a valve (20) in response to operation of the pump (200). A fuel recycle system for an engine (10), the fuel recycle system comprising: a first chamber (610) configured to contain a fluid that changes volume in response to at least one ambient condition; a second chamber (611) configured to hold fuel; and a diaphragm (607) configured to separate the first chamber (610) from the second chamber (611), wherein the at least one ambient condition provides the relative sizes of the first chamber (610) and the second chamber (611). ) to change and aspirate fuel in the second chamber (611) from a carburetor (11) of the engine (10) or to expel the fuel from the second chamber (611) into a fuel tank (15) of the motor (10). The fuel recycling system of claim 25, wherein a first state of the at least one ambient condition causes the fluid of the first chamber (610) to expand and expel the fuel from the second chamber (611). in the fuel tank (15) of the engine (10). The fuel recycling system of claim 25, wherein a second state of the at least one ambient condition causes the fluid of the first chamber (610) to compress and draw fuel into the second chamber (611). from the carburetor (11) of the engine (10). The fuel recycling system of claim 25, wherein the at least one ambient condition includes the temperature of the engine (10), and wherein the fluid is air. The fuel recycling system of claim 25, wherein the first chamber (610) and the second chamber (611) are integrated. The fuel recycle system of claim 25, wherein the first chamber (610) is within a predetermined distance from a heat source. The fuel recycling system of claim 30, wherein the heat source is a muffler, crankcase, or exhaust tube. The fuel recycling system of claim 30, wherein the heat source is a battery powered heating element. The fuel recycling system of claim 25, wherein the first chamber (610) and the second chamber (611) are spaced from each other. The fuel recycle system of claim 25, wherein the first chamber (610) is mounted within a predetermined distance to a heat pipe. A carburetor (11) comprising: a carburetor tank (12) configured to store fuel and supply the fuel to an air passage (25); a fuel supply pipe (23) connected to a fuel tank (15) and to the carburetor tank (12); a fuel purge pipe (21) connected to the carburetor tank (12) and the fuel supply line (23); and a fuel tank (15) rotatable to change orientation relative to the carburetor tank (12) and including an inlet needle (411) for the fuel bleed pipe (21) configured for open and close in response to the orientation of the fuel tank (15). 36. The carburettor (11) of claim 35, further comprising; a carburetor housing; and a hinge configured to rotatably connect the fuel tank (15) and the carburetor housing. 37. The carburettor (11) according to claim 36, wherein the intake needle (411) opens when the orientation of the carburetor (11) is in a storage orientation. The carburettor (11) of claim 36, wherein the intake needle (411) closes when the orientation of the carburetor (11) is in an operating orientation. 39. The carburettor (11) according to claim 36, wherein the admission needle (411) opens or closes in response to a force of gravity. 40. The carburettor (11) of claim 36, wherein the fuel purge pipe (21) is configured to purge the expired fuel from the carburetor tank (12).