JPH07310610A - Air cleaner - Google Patents

Abstract

PURPOSE:To separate comparatively large refuse in introduced air with high efficiency, to improve durability of an air filter, and to lengthen an interval of maintenance by a method wherein four members of a cleaner case, a middle cover, an air filter, and a cleaner cover are removably combined together. CONSTITUTION:Along with the starting of an internal combustion engine, air introduced through the intake air passage 16 of a cleaner cover 15 passes through a ventilation passage 17, an annular vent passage 10 formed between a cleaner case 1 and a middle cover 6, a communication hole 11 formed in the middle cover 6, and a space 7 formed between the middle cover 6 and an air filter 8 and is introduced in a carburetor K through the opening part 2 of the cleaner case 1 after the flow of it through an internal space from the outer periphery of an air filter 8. During this time, especially during the passage of it through the annular vent passage 10, comparatively large refuse contained in introduction air is collected and accumulated at the lower part of the cleaner case 1, i.e., an unloader valve 4 part, and automatically discharged to the outside by means of a pulse for suction of the internal cambustion engine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air cleaner for supplying purified air to a carburetor of an internal combustion engine, and is particularly effective for an engine cutter and various traveling vehicles used in a dusty environment. The relatively large dust in the introduced air is efficiently separated before reaching the air filter, thus improving the durability of the air filter and extending the maintenance interval. The feature is that the air can be automatically discharged to the outside, and the intake noise can be reduced.

[0002]

2. Description of the Related Art A conventional general air cleaner for supplying purified air to a carburetor of an internal combustion engine is, for example,
A cylindrical air filter is arranged in the cleaner body.

The air introduced from the outer peripheral surface of the cylindrical air filter is passed through the air filter to separate and remove dust in the introduced air.
Purified air is supplied to the carburetor from the internal space of the air filter.

The applicant of the present invention has provided an air cleaner capable of separating and removing relatively large dust contained in the introduced air before reaching the cylindrical air filter (see Japanese Utility Model Publication No. 30620/1990). ).

[0005]

In the above conventional general air cleaner, since the introduced air is directly supplied to the surface of the air filter, all the dust contained in the introduced air adheres to the surface of the air filter. It was to accelerate the clogging of the air filter.

The function of the air filter is hindered by the adhesion of dust, and the driving of the internal combustion engine is also affected.

Further, the air filter which is clogged due to the adhesion of dust has to be frequently cleaned or replaced, which causes problems in durability and maintenance of the air filter.

Therefore, the applicant of the present invention has provided the air cleaner having the above structure.

The present invention has the same purpose as the air cleaner provided by the applicant of the present invention, but is introduced by making the passage of the introduced air longer and further bending and swirling the introduced air. The relatively large dust in the air can be efficiently separated, the durability of the air filter can be improved and the maintenance interval can be extended, and the separated dust can be automatically discharged to the outside and removed. An object of the present invention is to provide an air cleaner capable of reducing the intake noise.

[0010]

In order to solve the above-mentioned problems, the present invention provides a tubular cleaner case having one end having an opening connected to a carburetor and the other end opened to have an unloader valve at the bottom. A cylindrical air filter that holds a carburetor side with a space inside is held, and has a spiral partition wall that forms an annular air passage between the outer peripheral surface and the inner peripheral surface of the cleaner case. An upper lid having a communication hole that communicates the space side and the annular air passage side at the upper portion, and an air intake passage, and an air passage communicating with the annular air passage is formed between the inner lid, The inner cover is held on the cleaner case side, and the cleaner cover is engaged with and held by the other end opening portion of the cleaner case.

[0011]

The air cleaner of the present invention includes the cleaner case 1,
The four members of the inner lid 6, the air filter 8 and the cleaner cover 15 are detachably combined, and the structure thereof is extremely simple.

Further, in the present invention, the air introduced from the intake passage 16 of the cleaner cover 15 when the internal combustion engine is started is formed into the ventilation passage 17, and the spiral annular ventilation passage formed between the cleaner case 1 and the inner lid 6. 10, communication hole 11 provided in inner lid 6, space 7 formed between inner lid 6 and air filter 8
Further, the air is introduced into the carburetor K through the opening 2 of the cleaner case 1 from the outer periphery of the air filter 8 through the inner space thereof.

In the meantime, particularly when passing through the annular ventilation passage 10, relatively large dust contained in the introduced air is collected and accumulated in the lower portion of the cleaner case 1, that is, the unloader valve 4 portion. Then, the accumulated relatively large dust is automatically discharged from the unloader valve 4 to the outside by the pulse of the suction of the internal combustion engine.

On the other hand, the air from which relatively large dust has been removed as described above reaches the outer peripheral surface of the air filter 8 through the communication hole 11 and further passes through the air filter 8 and becomes smaller. The dust is removed and the opening 2 of the cleaner case 1 is removed from the internal space of the air filter 8.
And is supplied to the carburetor K.

That is, according to the present invention, since relatively large dust in the introduced air is sufficiently removed before reaching the air filter 8, the air filter 8 is different from the conventional one.
Clogging of the intake passage is not accelerated, durability is improved, frequent maintenance is no longer required, and the maintenance interval is extended.
6. The effect of the intake passage can be enhanced by the function of the air passage 17.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a longitudinal sectional view of an air cleaner according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a main portion, FIG. 3 is a plan view of an inner lid, and FIG. 4 is a sectional view taken along line IV-IV of FIG.

Reference numeral 1 in FIG. 1 denotes a cleaner case, which is formed in a substantially cylindrical shape and has one end having an opening 2 and a carburetor K.
And the other end is opened, and an appropriate number of engaging projections 3a, 3b, 3c are formed on the outer peripheral edge of the opening.

In the illustrated embodiment, three engaging projections 3a, 3b, 3c are provided at positions that divide the outer peripheral edge of the opening of the cleaner case 1 into three equal parts.

A cleaner cover 15, which will be described later, is engaged with and held by the engaging projections 3a, 3b, 3c, and is configured so as not to come off due to vibration or the like. The number may be four or more.

Reference numeral 4 denotes a duckbill-type unloader valve provided in the lower portion of the cleaner case 1, which is made of a flexible material such as rubber, has a slit 5 at the center of the lower end thereof, and has a bottom portion of the cleaner case 1. Automatically eject the collected relatively large dust particles in a timely manner.

Reference numeral 6 denotes an inner lid, which has a substantially cylindrical shape similar to the cleaner case 1, and has an annular space 7 having an appropriate size therein, and a substantially cylindrical air opening on the carburetor K side. The filter 8 is held, and a spiral partition wall 9 is provided between the filter 8 and the cleaner case 1 on the outer peripheral surface thereof, and a spiral annular ventilation path 10 is formed between the filter 8 and the inner peripheral surface of the cleaner case 1. To be done.

Further, a communication hole 11 that communicates the space 7 side and the annular ventilation path 10 side is provided in the upper portion of the inner lid 6.

In the figure, 12 is a knob that also serves as an airflow deflector used when attaching and detaching the inner lid 6 and the air filter 8, and 13 and 14 are seal holding plates of the air filter 8, respectively.

Reference numeral 15 is a cleaner cover that closes the open end of the other end of the cleaner case 1, and an intake passage 16 acting as an intake muffler is provided on the outer side surface of the cleaner case 1. An air passage 17 communicating with the annular air passage 10 is formed.

The cleaner cover 15 holds the inner lid 6 on the cleaner case 1 side by a partially cutout annular rib 19 which also serves as a ventilation path partition wall and engages with the other end opening portion of the cleaner case 1.・ Retained.

The cleaner cover 15 is attached to the opening of the other end of the cleaner case 1 by engaging the engaging protrusions 3a, 3b, 3c of the cleaner case 1 inside the opening of the cleaner cover 15. Is received and rotated by a predetermined angle, locking portions 18a, 18b, 18c that engage with the engaging protrusions 3a, 3b, 3c are formed.
After fitting a, 18b, and 18c between the engaging protrusions 3a, 3b, and 3c of the cleaner case 1, the cleaner cover 15 is fixed by rotating the cleaner cover 15 by a predetermined angle, and is known per se so as not to come off easily. It is composed of the structure.

Then, as described above, the cleaner cover 15 is engaged with and held by the cleaner case 1, so that the introduced air is introduced into the intake passage 16, the ventilation passage 17, and the annular ventilation passage 1.
0, communication hole 11, space 7, air filter 8, opening 2
Is supplied to the carburetor K through.

According to the present invention having the above-mentioned structure, the cleaner case 1,
It has a simple structure in which four members of the inner lid 6, the air filter 8 and the cleaner cover 15 are detachably combined.
Relatively large dust contained in the introduced air is effectively removed before reaching the air filter 8.

That is, when the internal combustion engine is started, air containing dust around the outside of the air cleaner is formed between the cleaner case 1 and the inner lid 6 from the intake passage 16 through the ventilation passage 17 on the inner surface of the cleaner cover 15. Spiral air passage 1
It is introduced into 0.

The air introduced into the spiral annular ventilation passage 10 is inverted and swirled when passing through it, and a relatively large amount of dust contained therein is in the lower part of the cleaner case 1, that is, Collected and accumulated in 4 parts of the unloader valve.

Then, the slit 5 provided at the lower end of the unloader valve 4 is automatically opened by the intake pulse of the internal combustion engine and is discharged to the outside.

On the other hand, the air from which relatively large dust has been removed as described above reaches the outer periphery of the air filter 8 through the communication hole 11, and further smaller dust is removed through the air filter 8. Further, it is supplied to the carburetor K through the opening 2.

That is, in the present invention, since relatively large dust contained in the introduced air is sufficiently removed before reaching the air filter 8, the air filter 8 is not clogged early. The durability of the air filter 8 is improved, the maintenance interval can be extended, and the cleaner cover 15
With the structure of the intake passage 16, the air passage 17, the spiral annular air passage 10, and the like, the effect of silencing the intake sound can be enhanced.

[0034]

According to the present invention, relatively large dust in the introduced air is efficiently separated before reaching the air filter, so that the durability of the air filter is improved and the maintenance interval is extended. In addition, the separated dust can be automatically discharged to the outside, and the effect of silencing the intake noise can be enhanced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an air cleaner according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part.

FIG. 3 is a plan view of an inner lid.

4 is a sectional view taken along line IV-IV in FIG.

[Explanation of symbols]

 1 Cleaner Case 2 Opening 3 Engagement Projection 4 Unloader Valve 6 Inner Lid 7 Space 8 Air Filter 9 Partition Wall 10 Annular Ventilation Path 11 Communication Hole 15 Cleaner Cover 16 Air Intake Path 17 Ventilation Path K Carburettor

Claims (1)

[Claims] 1. A carburetor K having one end having an opening 2.
And a cylindrical cleaner case 1 having the other end open and an unloader valve 4 at the bottom, and a space 7 inside.
A cylindrical air filter 8 which is opened to open the carburetor K side is held, and the cleaner case 1 is provided on the outer peripheral surface.
An inner lid that has a spiral partition wall 9 that forms an annular ventilation passage 10 between the inner peripheral surface and the inner peripheral surface, and that has a communication hole 11 that communicates the space 7 side and the annular ventilation passage 10 side in the upper portion. 6 and an intake passage 16, and a ventilation passage 17 communicating with the annular ventilation passage 10 is formed between the inner lid 6 and the inner lid 6, and the inner lid 6 is held on the cleaner case 1 side to hold the cleaner case 1. 1. An air cleaner comprising: a cleaner cover 15 which is engaged and held at the other end opening portion of 1.