JPH0531260Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to the structure of an air cleaner for a small engine used in a brush cutter or the like.

(Prior Art) Conventionally, the case of an air cleaner for a small engine is molded from synthetic resin or sheet metal, has an intake port at the bottom, and has an element installed inside. The structure is as shown in a, b, and c.

Figure 3a is a front view of the air cleaner, Figure 3b
4 is a front view of the case body, FIG. 4 a is a bottom view of the air cleaner with a part removed, and FIG.
FIG. 4C is a sectional view taken along the line BB in FIG. 4A, and FIG.

As shown in FIG. 3b, an air intake port c that opens downward is provided at the bottom of a case body a that has an element case d inside, and the air sucked through the air intake port c flows through the case in a cyclical manner. The gas is circulated through the lower opening e of the element case d and guided to the vaporizer (not shown) via the element f. The blowback fuel (oil mist) accumulated in the case is discharged to the outside from a drain hole 4' provided in the lower part of the case body a.

The details of the intake port c are as shown in FIGS. 4a, b, and c, and the lower end of the cover b is attached in close contact with the outer wall of the intake port c on the side of the case body a.

The present applicant has also filed an application for the same purpose as the present invention by Utility Application No. 1349/1983. In this device, a partition is formed to connect the peripheral edge of the intake port and the peripheral edge, and a step is formed on the end face of the peripheral edge or the partition.

(Problem to be solved by the invention) By the way, the engine to which the invention is applied is for use in working machines such as portable brush cutters and tea pickers. During agricultural work, workers carry the air cleaner in their hands or hang it from their shoulders, so clothes, leaves, etc. can stick to the air cleaner inlet and block it, causing engine damage. The intake air may be cut off and the engine may stall.

Furthermore, due to the nature of work equipment, work is frequently performed in the rain, and rainwater is sucked in from the air cleaner, causing fluctuations in the engine speed and causing problems such as hindrance to work.

(Means for Solving the Problems) The present invention provides an air cleaner that includes a case body with an element mounted therein and a cover that covers the case body, and has an intake port that opens downward at the bottom of the case body. A cylindrical air inlet body 1 for introducing air is provided at the lower part of the case body, and a rain guard 3 is provided at the lower end of the case opposite to the side surface 5 of the air inlet body 1. A small gap 6 is formed between the side surface portion 5 of the intake port body 1 and
In the middle of the gap 6, there is a substantially triangular auxiliary intake passage 2 that passes into the case and allows a part of the intake air to flow through the case.
The air cleaner is characterized in that a drain hole 4 is provided in the intake port body 1 and communicates with the intake port from the inner bottom of the case.

(Operation) Although most of the air is taken from the intake port, air is also taken from the auxiliary intake passage. Therefore, even if the intake port were to become blocked, there would be enough air to maintain the working load operating condition through the auxiliary intake passage that leads into the case through the gap between the intake port body and the rain guard. intake is performed and the engine is prevented from stopping.

Furthermore, by providing a rain guard, rain water is not sucked in from the air cleaner during rainy work, and fluctuations in engine speed are suppressed.

In addition, blowback fuel (oil mist) flowing down to the bottom of the case enters the intake port through the drain hole, mixes with the intake air, and circulates, and is not directly discharged outside the case.

(Example) Next, an example of the present invention will be described based on the drawings.

Figure 1a is a front view of the air cleaner, Figure 1b
is a front view of the case body, Figure 2a is a bottom view of the air cleaner with a portion removed, and Figure 2b is a bottom view of the air cleaner.
FIG. 2C is a sectional view taken along the line A--A in FIG.

The structure of the air cleaner of the present invention is essentially the same as that shown in FIGS. 3a and 3b showing the conventional example.

The case body a is molded from synthetic resin or sheet metal, has an intake port c at the bottom, and has an air cleaner element f installed inside.

The details of the intake port c portion are as shown in FIGS. 2a, b, and c. The intake port body 1 is constructed by integrating two (plural) cylinder bodies 1', 1' each having an intake port c. The axial surface of the upper half of this intake port body 1 is the side surface 5, and the joint between the cylinders 1' and 1' and the lower end of the cover b
A substantially triangular recess formed between the auxiliary intake passage 2 and the auxiliary air intake passage 2 is formed between the auxiliary intake passage 2 and the auxiliary intake passage 2 that communicates with the inside of the case.

(See the dark shaded area in Figure 2a) Lower end of the cover that is in contact with the side surface 5 of the intake port body 1
b' has a shape in which the curved surface portions of the cylinders 1', 1' are connected with a straight line, and a small gap 6 is formed between the cylinder body 1 and the side surface 5 of the air intake body 1, and a rain guard 3 is provided. Therefore, the auxiliary intake passage 2 is located in the middle of the gap 6 between the intake port body 1 and the rain guard 3.

Note that the cover b is a cover that conforms to the shape of the case body a.

In FIG. 1b, reference numeral 4 denotes a drain hole formed in the air inlet body 1 so as to communicate from the bottom of the case body a to the air inlet c, and is formed in the side of one cylindrical body 1'.

In the above configuration, air sucked into the case from the intake port c circulates in a cycle within the case and is guided from the lower opening e of the element case d through the element f to a carburetor (not shown).

Here, most of the air is taken in through the intake port c, but air is also taken in through the auxiliary intake passage 2 provided in the middle of the gap 6 between the air intake body 1 and the rain guard 3. Therefore, since the gap between the intake port body 1 and the rain guard 3 will not be closed, in the unlikely event that the intake port c
Even if the auxiliary intake passage 2 is blocked by a piece of clothing or leaves, the auxiliary intake passage 2 is Sufficient air is sucked in for workload operation, preventing the engine from stopping.

Further, the sucked-back fuel that has flowed down to the bottom of the case enters the intake port c through the drain hole 4 formed in the intake port body 1, mixes with intake air, and is circulated.
Therefore, there is no possibility that the sucked-back fuel accumulated in the case is directly discharged out of the case through the drain hole and contaminates the equipment below the air cleaner, as is the case in the past.

(Effects of the invention) According to the invention having the above configuration, the following effects are achieved.

(1) A cylindrical intake body is provided at the bottom of the air cleaner, and a small gap is formed between the cover and the intake body at the lower end of the cover that is in contact with the side surface of the air intake body to prevent rain. A guard is provided and an auxiliary air intake passage leading into the case is provided in the middle of this gap, so even if the air intake is blocked by part of the worker's clothes or leaves, rain will not be removed. The gap formed between the avoidance guard and the side of the intake port body is not blocked, and the intake air from the auxiliary intake passage through this gap can avoid engine stoppage and rotational fluctuations, making work more efficient. can perform well.

(2) When the blowback fuel adhering to the inner wall surface of the case flows down to the bottom of the case, this blowback fuel enters the intake port through the drain hole, mixes with the intake air, and circulates. In this way, the blowback fuel that accumulates inside the case is not directly discharged outside the case and contaminates equipment located below the air cleaner.

(3) Since there is a gap between the air inlet body and the rain guard, water droplets that flow down the outside of the case when working in the rain are blocked by the rain guard and do not reach the air inlet. This reduces the amount of moisture in the air that is taken in through the air intake.

[Brief explanation of the drawing]

FIG. 1a is a front view of an air cleaner showing an embodiment of the present invention, FIG. 1b is a front view of the case body,
Fig. 2a is a bottom view of the air cleaner with a part removed, Fig. 2b is a sectional view taken along line A-A in Fig. 2a,
Figure c is a perspective view of the bottom with the case body and cover separated, Figure 3a is a front view of a conventional air cleaner, Figure 3b is a front view of the case body, and Figure 4a is a front view of the case body. FIG. 4b is a sectional view taken along the line B-B of FIG. 4a, and FIG. 4c is a perspective view of the bottom of the air cleaner with a portion removed. . 1... Intake port body, 1'... Cylindrical body, 2... Auxiliary intake passage, 3... Rain guard, 4, 4'... Drain hole, 5... Side part of intake port body, 6 ……gap,
a...Case body, b...Cover, b'...Cover lower end, c...Intake port, d...Element case, e...Element case opening, f...Element.

Claims (1)

[Scope of utility model registration request] In an air cleaner consisting of a case body with an element mounted inside and a cover that covers the case body, and having an intake port opening downward at the bottom of the case body, a cylindrical intake port body 1 for introducing intake air is attached to the case body. Provided at the bottom of the main body, the intake port body 1
A rain guard 3 is provided at the lower end of the case opposite to the side surface 5 of the case, and a small gap 6 is formed between the rain guard 3 and the side surface 5 of the air intake body 1.
A substantially triangular auxiliary intake passage 2 is provided in the middle of the gap 6 to pass into the case and allow a portion of the intake air to flow, and a drain hole 4 is bored in the intake port body 1 to communicate with the intake port from the inner bottom of the case. An air cleaner characterized by the following: