JPH08338327A - Air cleaner device for small sized engine - Google Patents

Abstract

PURPOSE: To hardly accumulate dust in a filter, facilitate removal of accumulated dust, and thereby reuse the filter. CONSTITUTION: The air cleaner device is provided with an air passage 12 which is so constituted as to be communicated in such a way that air forcibly enters in an inlet port 12a disposed close to a part 11a of an air cooling fan 11 for an engine 10, and air is forcibly exhausted out of an exhaust port 12b disposed close to the other part 11b of the cooling fan 11, and the aforesaid device is formed out of a cabretor chamber 14 where a carburetor 13 connected to the engine 10, is built in, which is communicated with the air passage 12 at the halfway of the passage, and of an air filter 15 provided for the communication part of the carburetor chamber 14 and the air passage 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an air cleaner device for a small engine used as a drive source for a chain saw, a portable circular saw, a portable band saw and the like.

[0002]

2. Description of the Related Art FIG. 16 is a schematic view of an air cleaner device for a conventional general small engine, where 1 is an engine, 2 is a carburetor which is connected to the engine 1 and is disposed in a carburetor chamber 3, and 4 is a carburetor 2. It is an air filter, and the outside air 5 can freely enter and leave the carburetor chamber 3.

FIG. 17 is a schematic view of another conventional air cleaner device for a small engine. The difference from the conventional example is that air enters the carburetor chamber 3 through its inlet 3a and an air passage through its outlet 3b. 6 is discharged from the exhaust port 6a to the side surface portion 7a of the cooling fan 7, and by disposing the exhaust port 6a of the air passage 6 in the vicinity of the side surface portion 7a of the cooling fan 7, Due to the air flow of the cooling fan 7, the air in the air passage 6 is drawn out, and the dust collected in the carburetor chamber 3 is discharged.

[0004]

In the case of the conventional air cleaner device for a small engine as described above, the air filter 4 is directly attached to the carburetor 2 and the air filter 4 is frequently cleaned when dust is collected. Or
In the case of an air cleaner device for a small engine used as a drive source for a chain saw, a portable circular saw, a portable band saw, etc., the environment in which it is used is bad and the air filter 4 becomes dusty. However, there is a problem that the cleaning and replacement are frequent, the cleaning and replacement are troublesome, and the replacement cost is high. This invention does not require frequent cleaning or replacement of the air filter, and when dust collects on the air filter, the air filter is divided into two parts, using a brush, or washing with water.
It is an object of the present invention to provide an air cleaner device for a small engine, in which dust can be easily removed and reused, and the trouble of replacing the air filter and the replacement cost are eliminated.

[0005]

According to the present invention, in order to achieve the above object, a part of the air flow generated by the air-cooling fan 11 of the engine 10 is forcibly entered from the intake port 12a, and the air is exhausted. A carburetor chamber 14 having a built-in air passage 12 that communicates so as to be discharged from the port 12b, a carburetor 13 that is connected to the engine 10 that communicates from the middle of the air passage 12, and the carburetor chamber 14
And an air filter 15 provided in a communication portion between the air passage 12 and the air passage 12, and an air cleaner device for a small engine.

Further, as shown in the schematic view of FIG. 1, an intake port 12a arranged near a part 11a of an air cooling fan 11 of an engine 10 and an exhaust port 12b arranged near another part 11b of the air cooling fan 11. Air passage 12 communicating with
And the engine 10 communicating from the middle of the air passage 12.
A carburetor chamber 14 having a built-in carburetor 13 connected to the carburetor chamber 14 and the air passage 1
It is an air cleaner device for a small engine, characterized in that it comprises an air filter 15 provided in a communicating portion with 2.

Further, as shown in the schematic view of FIG. 2, the air-cooling fan 11 of the engine 10 is communicated so that air is forcibly entered from an intake port 12a arranged near a portion 11a of the fan 11 and exhausted from an exhaust port 12b. An air passage 12 and a carburetor chamber 14 having a built-in carburetor 13 connected to the engine 10 communicating from the middle of the air passage 12,
This is an air cleaner device for a small engine, which is composed of an air filter 15 provided in a communicating portion between the carburetor chamber 14 and the air passage 12.

Further, as shown in the schematic view of FIG. 3, the air that has entered through the intake port 12a is the air cooling fan 11 of the engine 10.
The air passage 12 communicating so as to be forcibly discharged from the exhaust port 12b disposed near the other portion 11b, and the carburetor 13 connected to the engine 10 communicating from the middle of the air passage 12 are built-in. Carburetor chamber 14
And an air filter 15 provided in a communication portion between the carburetor chamber 14 and the air passage 12, the air cleaner device for a small engine.

Further, as shown in the schematic views of FIGS. 4, 5 and 6, the air filter is a cylindrical air filter 15a interposed in a communication portion between the air passage 12 and the carburetor chamber 14. This is an air cleaner device for a small engine, which is characterized in that

Further, as shown in FIG. 12, the cylindrical air filter 15a has a structure that has no mesh on the bottom surface and has meshes 15a ₃ and 15a ₃ on both side surfaces. It is a cleaner device.

Further, as shown in FIG. 13, the cylindrical air filter 15a has no mesh on the bottom surface, and both frame bodies 15a ₁ and 15a having meshes 15a ₃ and 15a ₃ are provided.
_This is an air cleaner device for a small engine, which is characterized by having a separable structure.

Further, as shown in the schematic views of FIGS. 7, 8 and 9, the air filter is a flat air filter 15b which is interposed in a communication portion between the air passage 12 and the carburetor chamber 14. This is an air cleaner device for a small engine, which is characterized in that

[0013]

As described above, in the air cleaner device for a small engine according to the present invention, a part of the air flow generated by the air-cooling fan 11 is forcibly entered through the intake port 12a, and the air is exhausted through the exhaust port 12b. Air passage 1 communicating with each other
From the middle of 2 to the communication part that communicates with the carburetor chamber 14,
An air filter 15 is provided, and air is sucked into the carburetor chamber 14 through the air filter 15 by the negative pressure of the carburetor chamber 14, and the cleaned air enters the carburetor chamber 14.

The air cleaner device for a small engine according to the present invention is constructed as shown in FIG.
Air is forced to enter from the intake port 12a of the air passage 12,
The air flows from the exhaust port 12b as indicated by the thick arrow so that the air is forcibly discharged by the negative pressure generated by the rotation of the air-cooling fan 11, and the carburetor 13 is used.
The air is sucked into the carburetor chamber 14
Becomes a negative pressure, air is sucked into the carburetor chamber 14 as indicated by a thin arrow in the air filter 15 provided in the communication portion between the carburetor chamber 14 and the air passage 12, and the cleaned air enters the carburetor chamber 14. . Most of the dust mixed in the air flowing through the air passage 12 due to the rotation of the air-cooling fan 11 is discharged from the exhaust port 12b together with the air, so that it is difficult for the dust to collect in the air filter 15.

Further, the air cleaner device for a small engine according to the present invention is configured as shown in FIG. 2 so that the rotation of the air-cooling fan 11 causes the intake port 12a of the air passage 12 as indicated by a thick arrow. The air is forced to enter from the exhaust port 12b and the air flows so as to be exhausted from the exhaust port 12b, and the air is sucked into the carburetor 13, so that the carburetor chamber 14 becomes a negative pressure, and the carburetor chamber 14 and the air passage 12 Air is sucked into the carburetor chamber 14 as indicated by a thin arrow in the air filter 15 provided at the communicating portion with the, and the cleaned air enters the carburetor chamber 14. Since most of the dust mixed in the air forcedly flowing through the air passage 12 is discharged from the exhaust port 12b together with the air, it is difficult for the dust to collect in the air filter 15.

Further, with the structure shown in FIG. 3, the rotation of the air-cooling fan 11 forces the air entering from the intake port 12a of the air passage 12 from the exhaust port 12b as indicated by the thick arrow. As the air flows so as to be discharged to the carburetor chamber 13 and the air is sucked into the carburetor chamber 13, the carburetor chamber 14 becomes a negative pressure, and the air filter 15 provided in the communicating portion between the carburetor chamber 14 and the air passage 12 is removed. Air is sucked into the carburetor chamber 14 as indicated by a thin arrow, and the cleaned air enters the carburetor chamber 14. Most of the dust mixed with the air forcedly flowing through the air passage 12 is discharged from the exhaust port 12b together with the air, so that the air filter 1
Dust becomes hard to collect in 5.

The air filter 15 is shown in FIG.
As shown in FIGS. 5 and 6, the cylindrical air filter 15a
Further, the flat air filter 15b as shown in FIGS. 7, 8 and 9 also operates in the same manner as described above.

Further, the cylindrical air filter 15a is
As shown in FIG. 12, since there is no mesh on the bottom surface and meshes 15a ₃ and 15a ₃ are provided on both side surfaces, dust adhering to the portions of the meshes 15a ₃ and 15a _{3 on} both side surfaces is protected from dust. If the dust falls to the bottom surface due to the fluctuation of the negative pressure of 14, the dust slides on the bottom surface and is discharged from the exhaust port 12b.

Further, the cylindrical air filter 15a is
As shown in FIG. 13, there is no mesh on the bottom surface, and both frame bodies 15a ₁ and 15a having meshes 15a ₃ and 15a ₃ are provided.
_{Since 2} is a separable structure, the mesh 15a
When cleaning the dust attached to the ₃ and 15a ₃ parts,
By separating the _two frame bodies 15a ₁ and 15a ₂ ,
The dust can be easily cleaned.

Further, the rotation of the air-cooling fan 11 of the engine 10 greatly changes due to the fluctuation of the load applied to the engine 10, and the fluctuation also changes the flow velocity of the air flowing through the air passage 12 and the amount of the air sucked into the carburetor 13. And the negative pressure in the carburetor chamber 14 also fluctuates, and when the negative pressure is small, the adhesion force of dust adhering to the mesh portions of the tubular air filter 15a and the flat air filter 15b becomes weak. The dust is blown off to the exhaust port 12b by the air flowing through the air passage 12.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of an air cleaner device for a small engine according to the present invention will be described in detail below with reference to FIGS. FIG. 10 is a side view of a first embodiment embodying the principle of the air cleaner device shown in FIG.
FIG. 11 is a plan view of the same, and 16 is a side cover having a plurality of ventilation holes 16a for covering the portion of the air cooling fan 11,
17 is provided between a portion 11a of the air-cooling fan 11 and the air inlet 12a of the air passage 12 to efficiently suck the air generated by the rotation of the air-cooling fan 11 into the air inlet 12a and prevent the intake of large dust. Lattice plate for doing, 15
Reference numeral a is a cylindrical air filter provided in a portion communicating with the carburetor chamber 14 in the middle of the air passage 12, and reference numeral 18 is a cover for sealing the carburetor chamber 14.

FIG. 12 is a perspective view of the cylindrical air filter 15a seen from the left side in FIGS. 10 and 11, and FIG. 13 is a perspective view of the cylindrical air filter 15a divided into two parts. The cylindrical air filter 15a is made of plastic. Frame body 15 that can be split in two
There is no mesh on the bottom surface of a ₁ and 15a ₂ , and meshes 15a ₃ and 15a ₃ are integrally formed on both side surfaces. Air enters from an inlet 15a _{4 as} shown by an arrow A, and air flows from an arrow B to an arrow B. As shown, there are an air passage that exits from the outlet 15a ₅ and an air passage that passes through the meshes 15a ₃ and 15a ₃ as shown by arrow C. As shown by the arrow C, the air cleaned through the meshes 15a ₃ and 15a ₃ enters the carburetor chamber 14.

Next, the operation of the first embodiment will be described. A part of the air flow generated by the rotation of the air-cooling fan 11 of the engine is forcibly entered from the intake port 12a arranged in the vicinity of the part 11a of the air-cooling fan 11, and the air is supplied to the other part 11b of the air-cooling fan 11. Is provided in a communication portion that communicates with the carburetor chamber 14 from the middle of the air passage 12 that communicates so as to be forcibly discharged by the negative pressure generated by the rotation of the air-cooling fan 11 from the exhaust port 12b disposed in the vicinity of As the air passes through the cylindrical air filter 15a as indicated by the thick arrow and the air is sucked into the carburetor 13, the carburetor chamber 14 becomes a negative pressure, and the cylindrical air filter 15a is indicated by a thin arrow in FIG. As shown by, the air is sucked into the carburetor chamber 14, and the cleaned air enters the carburetor chamber 14. Since most of the dust mixed in the air flowing through the air passage 12 and the tubular air filter 15a is discharged from the exhaust port 12b together with the air, the dust is less likely to collect in the tubular air filter 15a.

Further, the cylindrical air filter 15a is
As shown in FIG. 12, since there is no mesh on the bottom surface and meshes 15a ₃ and 15a ₃ are provided on both side surfaces, dust adhering to the portions of the meshes 15a ₃ and 15a _{3 on} both side surfaces is protected from dust. If the dust falls to the bottom surface due to the fluctuation of the negative pressure of 14, the dust slides on the bottom surface and is discharged from the exhaust port 12b.

In addition, the cylindrical air filter 15a is
As shown in FIG. 13, there is no mesh on the bottom surface, and both frame bodies 15a ₁ and 15a having meshes 15a ₃ and 15a ₃ are provided.
_{Since 2} is a separable structure, the mesh 15a
When cleaning dusts attached to the ₃ and 15a ₃ parts with a brush or the like, the dusts can be easily cleaned.

FIG. 14 is a plan view showing a part of a second embodiment embodying the principle of the air cleaner device shown in FIG. 7, and in this embodiment, the air passage 12 and the carburetor chamber 14 are formed. A flat plate-shaped air filter 15b is provided in the communication portion between the two. FIG. 15 is a perspective view of the flat plate-shaped air filter 15b.
A mesh 15b ₂ is formed integrally with 5b ₁ . Even with such a flat plate-shaped air filter 15b, the same action and effect as in the case of the cylindrical air filter 15a can be obtained. However, in the case of the flat plate-shaped air filter 15b, its manufacture is simplified, The cost will be lower.

In both the first and second embodiments, the rotation of the air-cooling fan 11 of the engine fluctuates greatly due to the fluctuation of the load applied to the engine, and the fluctuation also changes the flow velocity of the air flowing through the air passage 12. The amount of air sucked into the carburetor 13 also changes, and the negative pressure in the carburetor chamber 14 also changes. When the negative pressure is small,
The adhesion force of dust adhering to the mesh portions of the cylindrical air filter 15a and the flat air filter 15b becomes weak, and at this time, the dust flowing to the exhaust port 12b is blown by the air flowing through the air passage 12.

[0028]

Since the air cleaner device for a small engine according to the present invention is constructed as described above, it is connected to the communicating portion communicating with the carburetor chamber from the middle of the air passage forcibly flowing the air from the intake port to the exhaust port. Since the air filter is provided, a part of the air forcedly flowing from the intake port of the air passage to the exhaust port passes through the air filter when a negative pressure is generated in the carburetor chamber due to the intake of the air into the carburetor. Is cleaned as the air flows into the carburetor chamber. Since most of the dust mixed in the air flowing through the air passage is discharged from the exhaust port of the air passage together with the air, it is difficult for the dust to collect in the air filter.

Further, the rotation of the air-cooling fan of the engine is
The negative pressure of the carburetor chamber also fluctuates due to the fluctuation of the load on the engine, the fluctuation of the flow velocity of the air flowing through the air passage, and the fluctuation of the amount of the air sucked into the carburetor. Is small, even when the air filter is a cylindrical air filter and a flat air filter,
The adhesion force of the dust adhering to the mesh portion is weakened, and at this time, the dust is blown to the exhaust port by the air flowing through the air passage. Therefore, it becomes difficult for dust to collect in the air filter.

Further, since the cylindrical air filter has a structure in which there is no mesh on the bottom surface and meshes on both side surfaces, dust attached to the mesh portions on both side surfaces fluctuates in negative pressure in the carburetor chamber. Thus, when the dust falls to the bottom surface, the dust slides on the bottom surface and is discharged from the exhaust port, so that it is difficult for the dust to collect in the cylindrical air filter.

Further, since the cylindrical air filter has a structure in which there is no mesh on the bottom surface and the two frame bodies having the mesh are separable, when cleaning the dust adhering to the mesh part By separating the frame body, the dust can be easily cleaned.

Even if the air filter is a flat plate-shaped air filter, the same action and effect as the cylindrical air filter can be obtained.
In addition to obtaining the effect, when the flat air filter is used, the manufacturing thereof becomes simple and the manufacturing cost becomes low.

[Brief description of drawings]

FIG. 1 is a drawing for explaining the gist of the present invention.

FIG. 2 is a drawing for explaining another gist of the present invention.

FIG. 3 is a drawing for explaining another gist of the present invention.

FIG. 4 is a drawing explaining another gist of the present invention.

FIG. 5 is a drawing explaining another gist of the present invention.

FIG. 6 is a drawing for explaining another gist of the present invention.

FIG. 7 is a drawing explaining another gist of the present invention.

FIG. 8 is a drawing for explaining another gist of the present invention.

FIG. 9 is a drawing for explaining another gist of the present invention.

FIG. 10 is a side view of an embodiment of the present invention.

FIG. 11 is a plan view of an embodiment of the present invention.

FIG. 12 is a perspective view of a tubular air filter that is a component of the present invention.

FIG. 13 is an exploded perspective view of a tubular air filter that is a component of the present invention.

FIG. 14 is a plan view showing a main part of another embodiment of the present invention.

FIG. 15 is a perspective view of a flat plate-shaped air filter which is a constituent member of another embodiment of the present invention.

FIG. 16 is a schematic diagram of an air cleaner device for a conventional general small engine.

FIG. 17 is a schematic view of another conventional air cleaner device for a small engine.

[Explanation of symbols]

1 engine 2 carburetor 3 carburetor chamber 4 air filter 5 outside air 6 air passage 6a exhaust port 7 cooling fan 7a side part 10 engine 11 air-cooling fan 11a part 11b other part 12 air passage 12a intake port 12b exhaust port 13 carburetor 14 carburetor chamber 15 air Filter 15a Cylindrical air filter 15a ₁ Frame 15a ₂ Frame 15a ₃ Mesh 15a ₄ Inlet 15a ₅ Outlet 15b Flat air filter 15b ₁ Frame 15b ₂ Mesh 16 Side cover 16a Vent hole 17 Lattice plate 18 Cover

Claims (8)

[Claims] 1. An air passage 12 communicating so that a part of the air flow generated by an air-cooling fan 11 of an engine 10 is forcibly entered from an intake port 12a and the air is exhausted from an exhaust port 12b. The air passage 12 comprises a carburetor chamber 14 that is connected to the engine 10 and is connected to the engine 10 from the middle of the air passage 12, and an air filter 15 provided in a communication portion between the carburetor chamber 14 and the air passage 12. Air cleaner device for small engines. 2. A portion 1 of an air cooling fan 11 of an engine 10.
An air passage 12 communicating so that air is forced to enter from an intake port 12a arranged near 1a and is forced to be discharged from an exhaust port 12b arranged near another portion 11b of the air-cooling fan 11. And a carburetor chamber 14 having a built-in carburetor 13 connected to the engine 10 communicating from the middle of the air passage 12, and the carburetor chamber 14
And an air filter 15 provided at a communication portion between the air passage 12 and the air passage 12. 3. A portion 1 of an air cooling fan 11 of an engine 10.
1a, an air passage 12 that communicates so that air is forced to enter from an intake port 12a and is discharged from an exhaust port 12b, and a carburetor 13 connected to an engine 10 that communicates from the middle of this air passage 12 An air cleaner device for a small engine, comprising: a carburetor chamber 14 having a built-in pump, and an air filter 15 provided at a communicating portion between the carburetor chamber 14 and the air passage 12. 4. The air that has entered from the intake port 12a is the engine 1
No. 0 air-cooling fan 11 has an air passage 12 communicating with it so as to be forcibly discharged from an exhaust port 12b arranged in the vicinity of another portion 11b, and a carburetor connected to an engine 10 communicating with the air passage 12 from the middle thereof. An air cleaner device for a small engine, comprising a carburetor chamber 14 having a built-in 13 and an air filter 15 provided at a communicating portion between the carburetor chamber 14 and the air passage 12. 5. The air filter according to claim 1, claim 2, claim 3 or claim 4, wherein the air filter is a tubular member interposed in a communication portion between the air passage 12 and the carburetor chamber 14. An air cleaner device for a small engine, which is an air filter 15a. 6. The cylindrical air filter 15 according to claim 5.
a has no mesh on the bottom surface and has 15 meshes on both sides.
An air cleaner device for a small engine having a structure having a ₃ and 15a ₃ . 7. The cylindrical air filter 15 according to claim 5.
a has no mesh on the bottom surface, and meshes 15a ₃ , 1
An air cleaner device for a small engine, characterized in that both frames 15a ₁ and 15a ₂ having 5a ₃ are separable. 8. The air filter according to any one of claims 1, 2, 3, and 4 is a flat plate-like member interposed in a communication portion between the air passage 12 and the carburetor chamber 14. An air cleaner device for a small engine, which is an air filter 15b.