JP3793999B2 - Accelerator for butterfly type vaporizer - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a carburetor that controls the amount and concentration of an air-fuel mixture supplied to an engine, and in particular, during acceleration operation of the engine, a plunger valve placed in a cylinder hole is pressed to pressurize a pump chamber, The present invention relates to an acceleration device in a butterfly type carburetor that injects acceleration fuel stored in a pump chamber into an intake passage via an injection nozzle.
[0002]
[Prior art]
The present invention relates to an accelerating device for a carburetor, and more particularly to an accelerating device that injects fuel for acceleration by pressing a plunger slidably disposed in a cylinder hole.
Such an acceleration device includes a cylindrical cylinder hole, a fuel introduction path having an upstream end opened in the bottom of the float chamber, a downstream end opened in the cylinder hole, and a suction check valve inside, and an upstream end. Is opened in the cylinder hole and has a discharge check valve inside, a fuel discharge path whose downstream end opens in the intake path via the injection nozzle, and a throttle valve that is movably disposed in the cylinder hole And a plunger valve that pressurizes the pump chamber formed in the cylinder hole by the opening operation.
[0003]
When the throttle valve is opened, the plunger valve pressurizes the pump chamber, so that the fuel stored in the pump chamber injects fuel into the intake passage through the fuel discharge passage and injection nozzle, thereby Accelerates the engine while suppressing the dilution of the air-fuel mixture during acceleration.
[0004]
[Problems to be solved by the invention]
The carburetor attached to the engine is inclined in all directions by nearly 90 degrees during its transportation.
This inclination is remarkably inclined particularly in general-purpose engines and outboard motor engines.
Here, if no special consideration is given to the arrangement of the cylinder holes and the opening position of the fuel introduction path into the float chamber, the fuel introduction path into the float chamber in the inclined state of the carburetor to the specified side. The opening and the cylinder hole may be located below the inclined liquid surface in the float chamber.
On the other hand, in the fuel introduction path, a normally closed suction side check valve that closes and holds the passage when the plunger valve is not operating is disposed.
In addition, the plunger valve is smoothly moved without resistance between the plunger valve that is movably disposed in the cylinder hole and the cylinder hole that slides the plunger valve, and the pump chamber is pressurized. A very small gap is formed so that the action is achieved.
In some cases, a seal ring for airtightness is arranged between the plunger valve and the cylinder hole. However, when the plunger valve is reciprocated, a large plunger pressing force is required. Therefore, it is not preferable to use this seal ring because of the operability of the engine.
[0005]
Here, when the engine is used over a long period of time, the foreign matter staying in the float chamber adheres to the check valve on the suction side and the blocking function of the valve is obstructed, and the vaporizer is moved to the specified side. As described above, when the opening of the fuel introduction path into the float chamber and the cylinder hole are located below the inclined liquid surface in the float chamber,
The fuel in the float chamber is not preferable because it flows into the cylinder hole through the fuel introduction path and the open suction side check valve, and this fuel may continuously leak to the outside.
[0006]
The acceleration device in the butterfly type carburetor according to the present invention particularly uses a plunger type pump as the acceleration device, and even when the carburetor is inclined in all directions, the fuel in the floating chamber is accelerated. An object of the present invention is to provide the acceleration device that can prevent continuous leakage to the outside.
[0007]
[Means for solving the problems]
According to the butterfly-type carburetor acceleration device according to the present invention, the object is that the longitudinal axis of the intake passage is drilled in the horizontal direction,
A carburetor body in which a butterfly-type throttle valve is arranged in the intake passage;
A floating chamber that forms a constant liquid level below the vaporizer body in the direction of gravity,
A main system in which the longitudinal axis of the main nozzle is disposed perpendicular to the longitudinal axis of the intake passage;
In a butterfly-type vaporizer with
The acceleration device has an intake side check valve inside, a fuel introduction path whose upstream end is communicated with the float chamber, a discharge side check valve inside, and a downstream end that communicates with the intake path via the injection nozzle A cylinder hole in which the fuel discharge passage is opened,
A plunger valve that is movably disposed in the cylinder bore and pressurizes a pump chamber formed in the cylinder bore by the opening operation of the throttle valve;
Wherein the cylinder holes in the accelerating device through the center of Men'nozuru with arranging in parallel in the vertical direction to the longitudinal axial line of Men'nozuru, even on a line perpendicular to the longitudinal axis of the intake passage and the longitudinal axial line Formed on one side,
On the other hand, the upstream end of the fuel introduction path is opened at the bottom of the float chamber in the downstream side of the intake path from the line perpendicular to the longitudinal axis of the intake path and on the other side of the longitudinal axis of the intake path. Achieved by:
[0008]
【Example】
Hereinafter, an embodiment of an acceleration device in a butterfly type vaporizer according to the present invention will be described with reference to the drawings.
Reference numeral 1 denotes a carburetor body in which the longitudinal axis XX of the intake passage 2 drilled inside is disposed in the horizontal direction, and is attached to the throttle valve shaft 3 in the downstream K of the intake passage 2. The butterfly-type throttle valve 4 (hereinafter simply referred to as the throttle valve 4) is rotatably arranged, and the opening of the intake passage 2 is controlled to be opened and closed by the throttle valve 4.
In order to facilitate the following description, the positional relationship with respect to the intake passage 2 is as shown in FIG. 4. One side J, the other side H, the downstream K, the upstream L, the upper N, the lower P, Is understood.
[0009]
Reference numeral 5 denotes a floating chamber body disposed below the vaporizer body 1. A floating chamber 6 is formed by the vaporizer body 1 and the floating chamber body 5, and a fuel (not shown) is formed in the floating chamber 6. A constant liquid level Q-Q is formed by the cooperative action of the valve seat connected to the inflow passage, the float valve that opens and closes the valve seat, and the float 7 that operates the float valve. (Float 7 is shown in FIG. 3)
[0010]
The upper N of the float chamber 6 is formed by deeply biting into the outer periphery of the intake passage 2 of the carburetor body 1, and an upper liquid level chamber 6A is formed above the liquid level QQ.
The upper liquid level chamber 6A is substantially constant with respect to the main nozzle in order to form an inclined liquid surface around the center W of the inclination during the inclination operation of the vaporizer or when the vaporizer is inclined at 90 degrees in all directions. This is necessary to form a high liquid level.
[0011]
The main system includes a main jet 8, a main nozzle 9, and a main air jet (not shown).
The main nozzle 9 and the main jet 8 are arranged concentrically, and the longitudinal axis M1-M1 of the main nozzle 9 is orthogonal to the longitudinal axis XX of the intake passage 2.
According to the above, the upper end of the main nozzle 9 is on the longitudinal axis XX of the intake passage 2 and opens into the intake passage 2, and the lower end of the main jet 8 opens into the float chamber 6.
[0012]
The float chamber body 5 is formed with a cylinder hole and the like for forming an acceleration device.
This will be described with reference to FIGS.
Reference numeral 10 denotes a cylindrical cylinder hole extending from the upper side N to the lower side P along the longitudinal axis M1-M1 of the main nozzle 9 from the upper surface 5A of the float chamber main body 5 contacting the lower end 1A of the vaporizer main body 1. Are recessed.
Further, the cylinder hole 10 is on the line YY passing through the center M1 of the main nozzle 9 and perpendicular to the longitudinal axis XX of the intake passage 2 and is also located on the longitudinal axis XX of the intake passage 2 Located on one side J.
[0013]
A fuel introduction path 11 and a fuel discharge path 12 are opened in the cylinder hole 10.
The fuel introduction path 11 will be described.
The upstream end 11A of the fuel introduction path 11 opens to the bottom of the float chamber 6, and the upstream end 11A is downstream K from the line YY and is H on the other side H from the longitudinal axis XX. Open to position.
The downstream end 11 </ b> B of the fuel introduction path 11 opens into the cylinder hole 10.
An intake valve seat 11C that faces the cylinder hole 10 is formed in the fuel introduction path 11.
[0014]
The fuel discharge path 12 will be described.
The upstream end 12 </ b> A of the fuel discharge path 12 opens into the cylinder hole 10, and the downstream opens to the upper surface 5 </ b> A of the float chamber body 5.
The fuel discharge passage 12 is formed with a discharge valve seat 12B facing downstream.
[0015]
The upper surface 5A of the float chamber main body 5 is disposed in contact with the lower surface 1A of the carburetor main body 1. At this time, the following configuration is disposed in the cylinder hole 10. Returning to FIG. 1 again, FIG.
Reference numeral 13 denotes a cylindrical plunger valve that is movably disposed in the cylinder hole 10 with a small gap. A pump chamber 14 is formed by the cylinder hole 10 and the bottom of the plunger valve 13.
Reference numeral 15 denotes a plunger spring that is contracted in the pump chamber 14 and presses the plunger valve 13 upward N.
[0016]
The plunger valve 13 is communicated with the throttle valve 4 and the throttle valve shaft 3 via a rod 17 and a pump lever 16 that rotates synchronously.
[0017]
A suction-side check valve 18 is disposed toward the intake valve seat 11 </ b> C of the fuel introduction path 11, and a discharge-side check valve 19 is disposed toward the discharge valve seat 12 </ b> B of the fuel discharge path 12.
Thus, in the pump chamber 14, a fuel introduction path 11 having a suction side check valve 18 and a fuel discharge path 12 having a discharge side check valve 19 are connected.
Further, a fuel discharge path 12C formed in the carburetor main body 1 is connected to a fuel discharge path 12 opened on the upper surface 5A of the float chamber main body 5, and an intake air is connected to a downstream end of the fuel discharge path 12C. An injection nozzle 20 opening in the path 2 is arranged.
[0018]
When the throttle valve 4 opens the intake passage 2 and the pump lever 16 rotates in the clockwise direction, the rod 17 moves downward synchronously to move the plunger valve 13 downward against the spring force of the plunger spring 15. To increase the pressure by reducing the volume of the pump chamber 14.
According to the above, the suction side check valve 18 closes the suction valve seat 11C, the fuel in the pump chamber 14 is pressurized, and the discharge side check valve 19 opens the discharge valve seat 12B by this pressurized fuel. Accordingly, the fuel for acceleration is injected into the intake passage 2 through the fuel discharge passages 12 and 12C and the injection nozzle 20.
[0019]
On the other hand, when the throttle valve 4 closes the intake passage 2 from the open state and the pump lever 16 rotates counterclockwise, the rod 17 moves up synchronously. According to this, since the plunger 17 is released from the pressure of the rod 17, the plunger valve 13 is moved upward by the spring force of the plunger spring 15 to increase the volume of the pump chamber and reduce the pressure.
According to the above, the discharge side check valve 19 closes the discharge valve seat 12B, while the suction side check valve 18 opens the suction valve seat 11C and opens into the float chamber 6, the upstream end 11A, the fuel introduction The fuel in the float chamber 6 is sucked into the pump chamber 14 via the path 11 to prepare for the next acceleration operation.
Thus, the fuel suction and discharge operations of the acceleration device are performed.
[0020]
Next, the operation will be described.
When the engine is stopped, when the engine is transported, the carburetor is greatly tilted by 90 degrees sideways and back and forth.
First, a first inclined state in which one side J is inclined downward and the other side H is inclined upward will be described with reference to FIG.
In the first inclined state, the liquid level is formed as liquid levels Q1-Q1 at a position below the longitudinal axis XX of the intake passage 2.
According to the above, as understood from FIG. 7, the cylinder hole 10 is disposed at a position below the liquid level Q1-Q1, but the upstream end 11A of the fuel introduction path 11 is disposed at a position above the liquid level Q1-Q1. Is done.
According to the above, the fuel in the floating chamber 6 does not continuously flow into the cylinder hole 10 via the upstream end 11 </ b> A and the fuel introduction path 11.
Thus, the fuel in the float chamber 6 does not continuously leak out of the carburetor through the gap between the cylinder hole 10 and the plunger valve 13.
[0021]
Secondly, a second inclined state in which the other side H is inclined downward and the one side J is inclined upward will be described with reference to FIG.
In the second inclined state, the liquid level is formed as the liquid level Q2-Q2 at a position below the longitudinal axis XX of the intake passage 2.
According to the above, as understood from FIG. 8, the upstream end 11A of the fuel introduction path 11 is disposed at a position below the liquid level Q2-Q2, but the cylinder hole 10 is disposed at a position above the liquid level Q2-Q2. Is done.
Thus, the fuel in the float chamber 6 does not continuously leak out of the carburetor through the gap between the cylinder hole 10 and the plunger valve 13.
[0022]
Third, a third inclined state in which the downstream K is inclined downward and the upstream L is inclined upward will be described with reference to FIG.
In the third inclined state, the liquid level is formed as liquid levels Q3-Q3 below the line YY passing through the center M1 of the main nozzle 9 and perpendicular to the longitudinal axis XX of the intake passage 2.
According to the above, as understood from FIG. 9, the upstream end 11A of the fuel introduction path 11 is disposed at a position below the liquid level Q3-Q3, but the cylinder hole 10 is disposed at a position above the liquid level Q3-Q3. Is done.
Thus, the fuel in the float chamber 6 does not continuously leak out of the carburetor through the gap between the cylinder hole 10 and the plunger valve 13.
[0023]
Fourth, a fourth inclined state in which the upstream L is inclined downward and the downstream K is inclined upward will be described with reference to FIG.
In the fourth inclined state, the liquid level is formed as liquid levels Q4-Q4 below the line YY passing through the center M1 of the main nozzle 9 and perpendicular to the longitudinal axis XX of the intake passage 2.
According to the above, as understood from FIG. 10, the upstream end 11A of the fuel introduction path 11 and the cylinder hole 10 are both located above the liquid level Q4-Q4.
Thus, the fuel in the float chamber 6 does not continuously leak out of the carburetor through the gap between the cylinder hole 10 and the plunger valve 13.
[0024]
【The invention's effect】
As described above, according to the accelerating device in the butterfly carburetor according to the present invention, the cylinder hole in the accelerating device is arranged in the vertical direction parallel to the longitudinal axis of the main nozzle and passes through the center of the main nozzle, and the intake passage a on line orthogonal to the longitudinal axis and is formed on the other side of the longitudinal axis of,
On the other hand, since the upstream end of the fuel introduction path is open to the bottom of the float chamber in the downstream of the line perpendicular to the longitudinal axis of the intake path and on one side of the longitudinal axis, when transporting the engine The carburetor is greatly inclined in all directions, but the acceleration fuel does not leak from the accelerating device to the outside of the carburetor and into the intake passage during such transportation, and the engine startability and initial acceleration performance deteriorate. Or, it is suitable for a general-purpose engine carburetor and an outboard motor carburetor, in which the fuel economy is not hindered and the engine is transported frequently.
[Brief description of the drawings]
FIG. 1 is a side view showing an embodiment of an acceleration device in a butterfly type vaporizer according to the present invention.
FIG. 2 is a top plan view of FIG.
FIG. 3 is a longitudinal sectional view taken along line EE in FIG.
FIG. 4 is a simplified diagram showing a positional relationship with respect to an intake passage.
5 is a top plan view of a floating chamber main body used in FIG. 1. FIG.
6 is a longitudinal sectional view taken along line CC in FIG. 6;
FIG. 7 is a top plan view showing a first inclined state.
FIG. 8 is a top plan view showing a second inclined state.
FIG. 9 is a top plan view showing a third inclined state.
FIG. 10 is a top plan view showing a fourth inclined state.
[Explanation of symbols]
2 Intake passage 6 Float chamber 9 Main nozzle 10 Cylinder hole 11 Fuel introduction passage 11A Upstream end of fuel introduction passage M1 Center of main nozzle XX Longitudinal axis of intake passage

Claims (1)

The longitudinal axis (XX) of the intake passage (2) is drilled in the horizontal direction,
A carburetor body (1) in which a butterfly throttle valve (4) is arranged in the intake passage (2);
A float chamber (6) that forms a constant liquid level below the vaporizer body (1) in the direction of gravity;
A main system in which the longitudinal axis (M1-M1) of the main nozzle (9) is arranged orthogonal to the longitudinal axis (XX) of the intake passage (2);
In a butterfly-type vaporizer with
The acceleration device includes a suction check valve (18) inside, a fuel introduction path (11) whose upstream end (11A) communicates with the float chamber (6), and a discharge check valve (19) inside. ) And a cylinder hole (10) in which a fuel discharge passage (12) whose downstream end communicates with the intake passage (2) via the injection nozzle (20) is opened,
A plunger valve (13) that is movably disposed in the cylinder hole (10) and pressurizes the pump chamber (14) formed in the cylinder hole (10) by the opening operation of the throttle valve (4);
The cylinder hole (10) in the accelerator is arranged vertically in parallel with the longitudinal axis (M1-M1) of the main nozzle (9) and passes through the center (M1) of the main nozzle (9), 2) on a line (YY) orthogonal to the longitudinal axis (XX ) of 2) and on one side (J) of the longitudinal axis (XX ) of the intake passage (2). ,
On the other hand, the upstream end (11A) of the fuel introduction path (11) is located downstream (K ) of the intake path (2) from the line (YY) orthogonal to the longitudinal axis (XX) of the intake path (2). ) And an opening in the butterfly carburetor characterized by opening at the bottom in the float chamber (6) on the other side (H) from the longitudinal axis (XX ) of the intake passage (2) .

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