JPH0752366Y2 - Air cleaner for portable work machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to an air cleaner for a portable working machine such as a chain saw.

2. Description of the Related Art Among portable work machines, for example, a chain saw is equipped with an air-cooled two-cycle internal combustion engine as a power source, and in order to send clean air to its carburetor, to remove foreign matters such as dust from the air. An air cleaner is installed. Since foreign substances such as dust adhere to the filter of the air cleaner during use, it is necessary to clean the filter regularly or as needed. However, in the conventional air cleaner, when trying to remove the air cleaner cover at the time of cleaning the filter, the filter also moves at the same time, and foreign matter such as dust adhering to the filter easily falls into the carburetor. There was a drawback that it hindered the operation of the engine. Also, when the outside temperature is low,
It is necessary to prevent the occurrence of the carburetor icing phenomenon of the internal combustion engine, which is the power source, and a simple means has been demanded.

Therefore, the present invention has a structure that can easily clean the filter without dropping foreign matter such as dust into the vaporizer, and can also prevent the vaporizer icing phenomenon. An object of the present invention is to provide an air cleaner for a portable working machine.

Means for Solving the Problems That is, an air cleaner for a portable working machine according to the present invention is screwed to a screw rod implanted in a body of a portable working machine powered by an internal combustion engine equipped with a carburetor. A second holding means for pressing and holding the tubular main filter against the machine body by a first pressing member formed around the screw hole while sealing the tubular main filter, and screwing an air cleaner cover covering the main filter to the screw rod. The pre-filter is attached to the machine body by a pressing member, and a pre-filter is interposed between the air cleaner cover and the main filter to surround at least a peripheral portion of the main filter, which directly receives the external air, and at the same time the one of the pre-filter It is characterized in that a warm-air inlet is normally closed in this portion and a blind plate portion is formed so as to be able to close the outside-air inlet when the mounting direction of the prefilter is changed.

Therefore, the prefilter which requires daily maintenance is the second
Can be easily cleaned by loosening the pressing member of the air cleaner cover, removing the air cleaner cover, and taking it out as needed. At that time, the main filter is sealed to the machine body by the first pressing member. It is held and prevents foreign matters such as dust from entering the internal combustion engine such as the carburetor.

Also, changing the mounting direction of the pre-filter prevents the occurrence of carburetor icing phenomenon by incorporating warm air.

Embodiment Next, the present invention will be described based on an embodiment of the drawings.

In this embodiment, as shown in the figure, a cylindrical filter paper type main filter 3 is arranged on the upper base portion 2 of the chain saw body 1, and the main filter 3 is an air cleaner attached to the body 1 as described later. With the cover 4,
The upper part and the surrounding part 24 are covered. The inner chamber 5 defined in the main filter 3 receives the cleaned air through the surrounding portion of the main filter 3, and the cleaned air is purified by the cleaning formed in the pedestal part 2. It is sucked from the air outlet 6 through the curved pipe 7 to the diaphragm type carburetor 8 and mixed with the fuel in the carburetor 8 to form a mixture, which is supplied to the air-cooled two-cycle internal combustion engine 10 through the intake pipe 9. It

The base portion 2 has a screw hole 11 formed at the center thereof,
The lower end of the screw rod 12 is screwed into and fixed to the screw hole 11. The threaded rod 12 extends upward through the center of the internal chamber 5 in the main filter 3. Main filter 3
A circular lid-shaped first pressing member 13 provided with a knob portion 25 is provided at the upper end of the. The first pressing member 13 has a screw hole 14 formed at the center thereof screwed into the screw rod 12 so as to be screwed to hold the main filter 3 against the base portion 2 and to The chamber 5 is sealed so that unfiltered outside air does not flow in. The screw rod 12 penetrates through the first pressing member 13 and extends further upward, and a knob-nut-shaped second pressing member 15 is provided at the upper end thereof. The second pressing member 15
Is a hole provided in the center of the upper surface of the air cleaner cover 4.
A shaft portion 17 that is loosely fitted in 16 and a head portion 18 that abuts against the upper outer surface of the air cleaner cover 4 and presses the air cleaner cover 4 downward, and has a screw hole 19 that is screwed into the screw rod 12.
Is formed. In this way, the air cleaner cover 4 is moved by the second pressing member 15 to the body 1
Is fixed to the upper part of the second pressing member 15 and
Although the air cleaner cover 4 can be removed from the machine body 1 by removing the screw rod 12, the first pressing member 13 presses the main filter 3 while the screw rod 12 is still screwed. Holds and keeps the internal chamber 5 sealed.

The air cleaner cover 4 and the receiving portion on the upper surface of the base portion 2
A prefilter 21 is attached between the precleaner 21 and the prefilter 21. The prefilter 21 has a U-shape, and the air cleaner cover 4
The inner circumference of the main filter 3 is surrounded by almost the entire circumference of the peripheral portion 24 of the main filter 3. Usually, the prefilter 21
2 directly receives outside air from an outside air inlet 22 formed in the pedestal portion 2 outside the air-permeable left end portion 26 shown in FIG. The air is sent to the main filter 3, and fine foreign matter is removed by the main filter 3 to send completely cleaned air to the vaporizer 8. On the other hand, the main filter 3 is blocked from the high temperature internal combustion engine 10 in the chain saw body 1 by the barrier portion 30 of the body 1 and the partition plate portion 29 of the air cleaner cover 4, but the stand portion A concave groove-shaped warm air inlet 23 formed at the right end of 2 communicates with the internal combustion engine 10 side through a communication port 31 provided in the barrier portion 30. The warm air inlet
The 23 is normally closed by a blind plate portion 27 provided on the right end side of the prefilter 21 as shown in FIG. When the outside air temperature is low, the prefilter 21 is turned upside down so that the blind plate portion 27 is now on the left side, and the protruding pieces 28, 28 provided at the symmetrical positions of the prefilter 21 are arranged. When fitted to the receiving parts 20 and 20, respectively, the outside air inlet 22 becomes the blind plate 27.
The warm air inlet 23 faces the left end portion 26 having air permeability, so that the warm air is introduced into the main filter 3.

Although not shown in detail, in the outside air introduction state shown in FIG. 2, since the protruding piece portion 28 of the left end portion 26 of the pre-filter 21 forms a ventilation portion, the outside air is exposed to the protruding piece portion 28. Pass and flow in the direction of the arrow pointing to the right. Of course, it is also possible to use a non-breathable protrusion 28.

For daily maintenance, it is sufficient to clean only the prefilter 21, and for this purpose, the second pressing member 15 is removed from the screw rod 12 and the air cleaner cover 4 is removed from the machine body 1 to clean the prefilter 21. At this time, the inner chamber 5 of the main filter 3 is fixed by the first pressing member 13,
Since it is hermetically sealed, foreign matter such as dust is prevented from entering it.

Effect of the Invention With the configuration of the present invention described above, the present invention has a chamber for forming a main filter and a chamber for forming a pre-filter, which are formed around a screw hole that is screwed into a screw rod. It is composed of a holding member, a second holding member, and an air cleaner cover, and the second holding member allows the air cleaner cover that covers the main filter to be attached to and detached from the machine body. Depending on the temperature of the outside air, it can be easily communicated with the warm air inlet to introduce warm air,
It is possible to introduce only outside air, and it is possible to easily perform daily maintenance with the main filter sealed, and prevent foreign matter such as dust from entering the carburetor from the main filter. It has the effect of preventing stains.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a chain saw having an air cleaner showing an embodiment according to the present invention, and FIG.
FIG. 6 is a plan view of the air cleaner of the figure with the air cleaner cover and the second pressing member removed. 1 ... Chain saw machine, 3 ... Main filter, 4 ...
Air cleaner cover, 8 ... Vaporizer, 10 ... Internal combustion engine,
12 …… Screw rod, 13 …… First pressing member, 14 …… Screw hole,
15 …… Second pressing member, 21 …… Prefilter, 22 ……
Outside air inlet, 23 ... Warm air inlet, 27 ... Blind plate part.

Claims (1)

[Scope of utility model registration request] 1. A screw hole (14) screwed into a screw rod (12) implanted in a machine body (1) of a portable working machine having an internal combustion engine (10) equipped with a carburetor (8) as a power source. ) Is used to press and hold the cylindrical main filter (3) against the machine body while sealing the cylindrical main filter (3) by the first pressing member (13), and the air cleaner cover (4) covering the main filter is attached to the screw rod. A surrounding area which is attached to the airframe by a second pressing member (15) which is screwed, and a prefilter (21) is interposed between the air cleaner cover and the main filter to directly receive at least external air of the main filter. Part (2
4) and the part of the pre-filter (21) that normally closes the warm air inlet (23) and changes the assembly direction of the pre-filter so that the outside air inlet (22) can be closed. ) Is formed, an air cleaner for portable working machines.