JP3011259U - Vaporizer for internal combustion engine - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to instantly supply fuel, which is gasoline, to the intake passage in any state, without being affected by the posture of the engine. [Structure] With respect to an orifice body that constitutes an orifice to be attached to a needle jet, at least the peripheral surface, the upper surface or the bottom surface, and further, any of them has a plurality of inflow passage inlets opened. It is characterized in that these inflow passages are orifices which are shaped so as to meet at the outflow passages.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a carburetor for an internal combustion engine, and more particularly, to a carburetor that sucks up liquid fuel by using a negative pressure generated by adjusting an opening area of the passage in an intake passage and supplies the liquid fuel to a combustion chamber. , A carburetor that is not easily affected by fluctuations in the fuel level.

[0002]

[Prior art]

 Generally, as shown in FIG. 11, the carburetor uses the differential pressure (negative pressure) generated between the upstream and the downstream of the throttle valve 11 existing in the intake passage 10 to open and close the fuel tank. It is well known that it has a function of sucking fuel and putting it on the fast flow of air in the intake passage 10 to vaporize the fuel, and sending it into the combustion chamber, so-called cylinder, to burn it. More specifically, as shown in FIG. 11, the fuel passage 13 from the fuel tank side is open to the fuel pool 14, and between the fuel pool 14 and the intake passage 10 is an orifice. The end of the needle jet 12, which is a conduit, is open through the nozzle 20, and a needle 12A having a taper is fitted into the needle jet 12 so that the needle 12A can move in the longitudinal direction. The opening area formed with the needle jet 12 is changed to adjust the flow rate of the fuel supplied to the intake passage.

Generally, the orifice 20 located at the end of the needle jet 12 is separate from the needle jet 12, and is screwed into an internal thread formed at the end of the needle jet 12. Are integrated. Since the internal combustion engine, or so-called engine performance, changes depending on the selection of the orifice diameter, a considerable amount of nerve is involved in the selection, especially in the competition of motorcycles (motorcycles) equipped with an engine, such as trial, motocross, and road race. Be seen.

As shown in FIG. 12, in the configuration of the orifice 20, an inflow port 22A is formed in a hexagonal nut-shaped orifice body 21, and this inflow port 22A flows out through an inflow passage 22. It is continuous with the passage 23. The orifice 20 is attached by screwing the screw portion 24 into the end portion of the needle jet 12. In this case, the shape of the orifice body 21 is a hexagonal nut shape for the convenience of closing work, and in the case of a cylindrical shape, a minus groove or a plus groove for a driver is required.

Since the diameter of the inflow passage influences the performance of the orifice, its setting is the most laborious work, and the inflow port 22 A is usually opened at the center of the bottom surface of the orifice body.

[0006]

[Problems to be solved by the device]

 In the case of an engine, when it is used as a stationary type like a small generator, the fuel level in the fuel pool does not change significantly even if there is a slight change due to engine vibration. However, if the engine is mounted on a motorcycle, it will be greatly affected by the posture of the motorcycle, and for example, the posture during running such as forward ascent, downward as well as right tilt, left tilt will change. Moreover, the engine rotation range is extremely wide, from the low rotation range to the high rotation range, and the engine is not operated under constant conditions, so the fuel level in the fuel pool constantly changes, and the so-called liquid level dances. Therefore, in an extreme case, even if it is a moment, the part of the orifice is exposed from the fuel level, and it becomes impossible to absorb the fuel. A situation that can not be generated to supply. This is the so-called engine breathing phenomenon, and is the reason why the start-up of the motorcycle is delayed for a moment.

For example, in cornering, when the vehicle body is tilted and the orifice is separated from the fuel level as described above, the so-called throttle valve is increased in order to escape from the corner and immediately start the engine. Even if you open and fully open and expect the engine to start up, you can not follow the rapid fuel supply, the engine will take a breathing phenomenon, and the engine will be delayed for a moment and you will fall into the situation of losing the game. is there. Such a phenomenon generally deteriorates the engine itself because it deteriorates the engine performance, but in reality, the carburetor has poor performance. It will be significantly improved.

In addition, because the entire carburetor vibrates due to the rapid high rotation of the engine, or the level of gasoline in the fuel pool of the carburetor changes significantly when the vehicle body is in a state of rapid acceleration, intake air As a result, a large amount of gasoline was supplied to the passage at one time, and gasolin was directly supplied into the cylinder without forming fine particles, and in extreme cases, the engine sometimes stopped. Therefore, when the gasoline is temporarily over-supplied, it can be held once without immediately supplying it to the intake passage, which is a venturi pipe, and the gasoline level of the fuel constantly changes. Even in such a situation, it is ideal to follow the opening of the throttle valve so that the engine speed can shift to the high-speed rotation range without inserting a haircut. The ability to interrupt the supply is desirable for vaporizers. Therefore, the present invention aims to make it possible to smoothly and swiftly make the transition of the engine from the deceleration state to the acceleration state or vice versa, the so-called engine start-up, and also to improve the operating force of the engine brake. It is intended.

[0009]

[Means for Solving the Problems]

 The present invention not only prevents all gasoline, which is fuel, from falling from the jet needle to the fuel pool when the engine is decelerating, but also when the orifice part is separated from the fuel level. The engine rotation can be immediately started from that state. In other words, the shape of the orifice attached to the end of the needle jet can be improved to supply gasoline quickly, and the deceleration state and the attitude of the motorcycle can be changed greatly to allow gasoline to be supplied from the orifice. Even if the supply is interrupted, all of the gasoline does not return to the fuel pool, and the return of gasoline to the fuel pool is suppressed at the orifice part, and the orifice part from the orifice part to the intake passage (pipe) at the next startup. In order to be able to immediately supply the existing gasoline to the intake passage, vaporize it and supply it to the cylinder, the number of inlets provided in the orifice is not one It is characterized in that it is configured so as to continue from the passage to the outflow passage.

[0010]

[Action]

 Since the present invention is configured as described above, it creates a state in which gasoline is temporarily stored in the needle jet between the orifice and the intake passage, and when the intake passage is opened, the stored gasoline is immediately sucked. It can be supplied to the passage so that the engine can be instantaneously brought into a state where it can be rotated at high speed even if the gasoline supply from the fuel pool is cut off. This is because, due to the improvement of the shape of the orifice, this part functions as a dam dam for gasoline, which is the fuel, and there is a large amount of gasoline retained in this part, and it is certain that the gasoline once inhaled will be retained reliably. .

[0011]

【Example】

 Embodiments of the present invention will now be described with reference to FIGS. 1 to 11 of the accompanying drawings. The same members as those of the conventional vaporizer shown in FIG. 11 are designated by the same reference numerals. In these drawings, reference numeral 10 indicates an intake passage which is a Venturi pipe. In the intake passage 10, a throttle valve 11, a needle 12A arranged in interlocking relation with the throttle valve 11 and a needle 12A are fitted. A needle jet (also called a main nozzle) 12 is arranged, and an orifice 20 is screwed to an end of the needle jet 12. Such a configuration is also used in the conventional vaporizer scenting hand.

FIG. 1 is a view showing the jet needle 12 with the needle 13 omitted, and an orifice 20 is screwed to the end of the jet needle 12, and the orifice 20 has a cylindrical shape. Six inflow passages 22 are radially formed in the orifice body 21 at equal intervals, and these inflow passages 22 are collectively formed as an outflow passage 23 at the central position. Are three-dimensionally orthogonal. The outflow passage 23 penetrates the center of the male screw portion 24 formed in the orifice body 21, and is a space where the needle 12A of the jet needle 12 exists when screwed to the female screw portion 12B of the jet needle 12. Can communicate with.

Since the inflow passage 22 of the orifice body 21 and the six inflow ports 22A are six, the inner diameter of each inflow passage becomes smaller than the inner diameter of the inflow passage in the conventional orifice, and the surface of gasoline It is possible to increase the amount of adhesion to the inner surface under the action of tension. As a result, even when the engine is rapidly raised from the deceleration state, a large amount of gasoline accumulated in the inflow passage 22 of the orifice 20 is instantaneously supplied to the jet needle 12, and the venturi pipe is used. It is supplied to the cylinder by the flow of air in a certain suction passage 10. Therefore, the occurrence of the engine breathing phenomenon is reliably prevented. Of course, even if the needle 12A shifts to the decelerating state and the passage of the jet needle 12 is narrowed and closed, the gasoline is stored in the plurality of inlets 22A and the passages connected thereto. Therefore, it is extremely easy to follow the next change.

In FIG. 2, the inlet 22A is opened on the peripheral surface of the orifice body 21, and six inflow passages 22 are formed radially and join the outflow passage 23 extending in the axial direction at the central portion. Is able to. Since the orifice body 21 has a cylindrical shape, a minus groove or plus groove 22B for a driver is formed. As a matter of course, as in the above-mentioned embodiment, the gasoline holding capacity is improved and it is possible to follow the rapid engine acceleration.

The structure shown in FIG. 3 is formed by forming a concave groove 25 on the peripheral surface of the orifice body 21 and opening the inflow port 22 A in the concave groove 25. Only the volume portion of the concave groove 25 is formed. Since gasoline can be stored, the ability to retain gasoline is improved, and when the gasoline, which has been apt to occur in the past, falls off the jet needle 12, it is possible to prevent the engine from breathing.

Compared to the embodiment shown in FIG. 3, the one shown in FIG. 4 has a flange 26 formed at the edge of the groove 25, and the volume of the groove 25 and the volume between the flanges 26, 26 are The holding capacity of the gasoline will be increased in proportion to, and even if the throttle valve is opened rapidly, it will be able to sufficiently respond to the engine start-up and accelerate.

In the structure shown in FIG. 5, the upper surface (as an end surface) of the orifice body 21 is a tapered surface 27, and six inlets 22 A of the inflow passage 22 are opened in the tapered surface 27 at equal intervals. However, the inflow passage 22 is inclined at an angle of 45 degrees with respect to the outflow passage 23, and the flow of gasoline is in a state of being bent once by 135 degrees after being sucked in once, and the suction resistance of gasoline is large, which prevents excessive suction. it can.

Further, FIG. 6 shows a state in which the embodiment shown in FIG. 5 is turned upside down, and a taper surface 28 is formed on the lower surface of the orifice body 21, and the inflow port 22 A is formed in the taper surface 28. Is opened, and has a smaller inflow resistance than the inflow passage 22 in the embodiment shown in FIG. 5, and is suitable for an engine with a small negative pressure.

Further, the one shown in FIG. 7 is one in which six inlets 22 A are concentrically opened on the bottom surface of the orifice body 21, and the inflow passage 22 is bent into a rectangular shape on the way toward the inflow passage 23. , Is bent at a right angle and continues to the outflow passage 23. According to this, the inflow resistance is small, but the gasoline retention capacity is large.

In FIG. 8, the inflow passage 22 formed in the orifice body 21 crosses in a T shape inside the orifice body, and a horizontal inflow passage in the drawing and an inflow passage also in the drawing are vertical. It is continuous with the outflow passage 23 in the section. Since the inlet of the inflow passage 22 is opened at the bottom surface of the orifice body, the inflow resistance is small and the gasoline retention capacity is improved.

In FIG. 9, the inflow passage 22 is formed in two steps along the axial center with respect to the outflow passage 23, so that the suction resistance of gasoline is reduced and the holding power of gasoline is also improved. The gasoline can be supplied sufficiently following the rapid acceleration of the engine.

Further, as shown in FIG. 10, three inflow passages are opened in the end surface of the orifice body 21, and they are unified and continuous to the outflow passage 23 on the way to the outflow passage 23. Since the streamline of is along the axis, the inflow resistance is extremely small, and gasoline has a large holding force.

In these embodiments, at least two or more inflow passages are formed in the orifice, and these inflow passages can communicate with a single outflow passage to supply gasoline to the needle jet. In addition, there is no shortage of suction, and the gasoline in the orifice can be retained by its surface tension, which makes it possible to respond to rapid engine startup. In addition, since the gasoline holding power is large, raw gas is not sucked in during sudden deceleration. The orifices shown in the above examples can be applied to slow jets, pilot jets, etc., and when used as a carburetor for four-wheeled vehicles as well as two-wheeled vehicles, rapid acceleration and deceleration can be achieved. It is possible to supply a power unit suitable for repeating races, rallies, and trial races.

[0024]

[Effect of device]

 As is clear from the above description, the vaporizer of the present invention creates a state in which gasoline is once stored in the needle jet between the inlet of the orifice and the intake passage, and immediately after the intake passage is opened. By supplying gasoline to the intake passage, it is possible to instantly bring the engine to a state where it can be rotated at high speed even if the supply of gasoline from the fuel pool is interrupted. This is because a large amount of gasoline is inhaled due to the shape improvement of the orifice and it is certain that the gasoline once inhaled is retained. Therefore, the output is improved and the output is improved even in the low speed region, so that the fuel efficiency is improved and the total amount of exhaust gas and the exhaust gas concentration are reduced, which is a good news for an internal combustion engine.

[Brief description of drawings]

FIG. 1 is a sectional view of a needle jet portion of a vaporizer of the present invention.

FIG. 2 is a half side sectional view and a bottom view of an orifice used in the vaporizer of the present invention.

FIG. 3 is a half side sectional view and a bottom view of an orifice used in the vaporizer of the present invention.

FIG. 4 is a half side sectional view and a bottom view of an orifice used in the vaporizer of the present invention.

FIG. 5 is a half side sectional view and a plan view of an orifice used in the vaporizer of the present invention.

FIG. 6 is a half side sectional view and a bottom view of an orifice used in the vaporizer of the present invention.

FIG. 7 is a half sectional view and a bottom view of an orifice used in the vaporizer of the present invention.

FIG. 8 is a side view and a bottom view of an orifice used in the vaporizer of the present invention.

FIG. 9 is a side view and a bottom view of an orifice used in the vaporizer of the present invention.

FIG. 10 is a half side sectional view and a bottom view of an orifice used in the vaporizer of the present invention.

FIG. 11 is a schematic sectional view illustrating a vaporizer.

FIG. 12 is a half sectional view and a bottom view of a conventional orifice.

[Explanation of symbols]

 10 Intake Passage 11 Throttle Valve 12 Jet Needle 20 Orifice 21 Orifice Main Body 22 Inflow Passage 22A Inflow Port 23 Outflow Passage 24 Male Thread Part 25 Recessed Groove 26 Flange 27 Tapered Surface 28 Tapered Surface

Claims (5)

[Scope of utility model registration request] 1. A carburetor for an internal combustion engine, comprising an orifice at least at an end of a needle jet,
Vaporization for an internal combustion engine, characterized in that the orifice is formed so as to be continuous with an outflow passage through a plurality of inflow openings opened at least at a peripheral surface or an end surface and provided at equal intervals, and an inflow passage communicating with the plurality of inflow openings. vessel. 2. The carburetor for an internal combustion engine according to claim 1, wherein the plurality of inflow ports are formed by opening in a continuous groove formed in the peripheral surface of the orifice body. 3. A carburetor for an internal combustion engine, comprising an orifice at least at an end of a needle jet,
An internal combustion engine characterized in that a taper surface is formed on an end surface of an orifice body of the orifice, and a plurality of inflow ports opened to the taper surface and an inflow passage communicating with the plurality of inflow ports are connected to the outflow passage. Vaporizer for engines. 4. A carburetor for an internal combustion engine, comprising an orifice at least at an end of a needle jet,
2. The carburetor for an internal combustion engine according to claim 1, wherein the orifice is formed by forming a flange with a groove on the circumferential surface. 5. A carburetor for an internal combustion engine, comprising an orifice at least at an end of a needle jet,
The carburetor for an internal combustion engine, wherein the orifice has a peripheral surface and an inflow port opened at an end surface.