JP2002098014A - Air cleaner for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air cleaner that can return blowby gas free from an oil content and a water content to the intake pipe side of an engine in low-cost fashion. SOLUTION: The air cleaner for an engine adopts the arrangement of a single filter element 3 in a casing 2 of the air cleaner 1 to partition the interior of the air cleaner 1 at least into a clean chamber 4 and a duct chamber 5. A partition wall 8 is arranged to partitively separate a blowby gas chamber 7 having a blowby gas reflux opening 6 from the clean chamber 4 and the duct chamber 5. The presence of the partition wall 8 directs blowby gas in the blowby gas chamber 7 to the clean chamber 4 via a blowby gas passage 9 in the filter element 3.

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 an engine, and more particularly to an air cleaner configured to return blow-by gas from a blazer device.

[0002]

2. Description of the Related Art FIG. 4 shows an air cleaner having the above-mentioned structure. FIG. 4 shows that the blow-by gas is guided from the blazer device of the engine E to the clean room 117 of the air cleaner 111 through the blow-by gas recirculation passage 124 so that the gas guide 125 can guide the blow bar gas to the air outlet 121 of the clean room 117. It is composed. With such an air cleaner 111, the oil mist contained in the blow-by gas can be led out to the carburetor 101 through the air outlet 121 by the gas guide 125.

[0003]

However, the prior art described above has the following problems. (A) The oil mist in the blow-by gas is scattered due to the return of gasoline from the air outlet 121 through the vaporizer 101 and the pressure fluctuation in the air cleaner 111,
The air cleaner body and its surroundings may be soiled. In particular,
When the gasoline blows back from the air outlet 121, the oil content of the blow-by gas dissolves into the gasoline contained in the filter element 116, and the oil content mixed with the gasoline flows out to pollute the surroundings. (B) The blow-by gas contains oil and moisture, and the content thereof increases during high-load operation. However, if the blow-by gas is directly returned to the air outlet 121, the oil and moisture are vaporized. There is a fear that the gas may adhere to the periphery of the throttle valve of the gas generator 101 and hinder the function of the vaporizer 101.

(C) There is a filter element 116 in which the filter element 116 is in a wet state so that fine dust and the like contained in the outside air can be efficiently removed by the filter element 116. However, if the air cleaner has a simple configuration, the wetting liquid is removed. Some air cleaners are not used, and such air cleaners are inexpensive, but may not sufficiently remove fine dust and the like contained in the outside air.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an engine air cleaner which can solve the above problems. An example of a specific purpose is as follows. (a) Prevent the air cleaner and its surroundings from being contaminated by oil in the blow-by gas. (b) To provide an air cleaner capable of returning blow-by gas from which oil and moisture have been removed to an intake pipe side of an engine without adding cost. (c) Fine dust contained in the outside air can be removed even by an inexpensive air cleaner that does not use a wetting liquid. It should be noted that the problems of the invention other than those described above and the means for solving the problems will be described in detail in the description in the following specification.

[0006]

The present invention will be described below with reference to, for example, FIGS. 1 to 3 showing an embodiment of the present invention. According to the first invention, a single filter element 3 is arranged in a casing 2 of an air cleaner 1, so that a blow-by gas recirculation port 6 is formed in an air cleaner of an engine in which the inside of the air cleaner 1 is divided into at least a clean room 4 and a duct room 5. A partition wall 8 for partitioning the provided blow-by gas chamber 7 from the cleaning chamber 4 and the duct chamber 5 is provided, and the presence of the partition wall 8 allows blow-by gas in the blow-by gas chamber 7 to be blow-bar in the filter element 3. It is formed so as to reach the clean room 4 via the gas flow path 9.

The second invention is characterized in that the blow bar gas passage 9 is formed so as to overlap with the outside air passage 10 which reaches the cleaning chamber 4 from the duct chamber 5 via the filter element 3. A third invention is directed to the cleaning chamber 4 according to the second invention.
And the blow-by gas chamber 7 with a single filter element 3
(For example, upper plane 1 in FIG. 1A)
9), the duct chamber 5 is provided on the side surface 12 of the filter element 3 substantially orthogonal to the same plane, and the blow-by gas chamber 7 is closer to the surface of the same plane as viewed from the duct chamber 5 (for example, In the case of 1 (A), the second area 2
3), wherein the cleaning chamber 4 is provided on a surface farther from the duct chamber 5 than the blow bar gas chamber 7 (for example, the first area 22 in FIG. 1A).

[0008]

According to the first aspect of the present invention, since oil, moisture and the like in the blow-by gas are surely removed by a single filter element, there is an inconvenience to a device such as a carburetor downstream of the air cleaner. Is also gone. In addition, pressure fluctuations in the clean room due to blow-back of the air outlet and the like do not directly act on the blow-by gas chamber by the partition walls, so that scattering of oil and the like is suppressed. Further, one filter element can perform both purification of the outside air and purification of the blow-by gas, thereby reducing the cost. Further, since the clean room and the blow-by gas chamber are spatially separated by the partition wall, gasoline and the like mixed with the oil component in the blow-by gas by blowing back from the air outlet are suppressed, and the oil mixed with the gasoline and the like from the air cleaner. The inconvenience of flowing out can be prevented.

According to the second aspect of the present invention, since the blow bar gas flow path is formed so as to overlap with the outside air flow path from the duct chamber to the clean room through the filter element, the flow-by gas remaining in the filter element is removed. Fine dust and the like in the outside air can be captured by the oil component, and the fine dust can be prevented from flowing into the clean room.

According to the third aspect, the negative pressure in the clean room is
The blow-by gas in the blow-by gas chamber flows through the blow-by gas flow path in the filter element to the cleaning chamber, and the air flowing from the duct chamber from the side surface of the filter element flows into the cleaning chamber through the outside air flow path in the filter element. In this case, a duct chamber is provided on a side surface of the filter element that is substantially orthogonal to the same plane, the blow-by gas chamber is provided on the same plane as a surface closer to the duct chamber, and the cleaning chamber is viewed from the duct chamber rather than the blow bar gas chamber. Since it is provided on the far surface, the area where the blow-by gas flow path and the outside air flow path overlap can be increased. Therefore, it is possible to increase the possibility of capturing fine dust and the like contained in the outside air.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A is a longitudinal sectional view of an air cleaner device showing one embodiment of the present invention, and FIG.
It is a line cross-sectional view. Drawing 2 is a figure for explaining composition of a filter element and a partition wall, and is a schematic perspective view which looked at a partition wall from the duct room side. FIG. 3 is a plan view of the partition wall viewed from the duct chamber side.

The air cleaner 1 is configured to be directly fixed to a carburetor 24, and a casing 2 of the air cleaner 1 is formed in a rectangular shape when viewed from the front as shown in FIG. The air cleaner 1 is configured so that it can be divided into a body portion 14 connected and fixed to a carburetor 24 and a cover portion 15. An air outlet 16 of the air cleaner 1 and a blow-by gas recirculation port 6 are provided on a surface of the body portion 14 on the engine side. In this embodiment, the blow-by gas recirculation port 6 is constituted by an outlet of a blow-by gas recirculation pipe 17. An outside air intake 18 is formed on the side surface of the cover portion 15 so as to be vertically arranged in FIG.

The filter element 3 is made of a material, such as urethane or sponge, capable of absorbing and retaining an oil component in the blow-by gas, and is formed in a cubic shape in this embodiment. The number of filter elements 3 provided in the air cleaner 1 is only one. The filter element 3 is accommodated in the casing 2 of the air cleaner 1 by being moved toward the side opposite to the side where the outside air intake 18 is formed, and the partition wall 8 as shown in FIGS. As a result, the remaining space in the air cleaner 1 is converted into the clean room 4 having the air outlet 16,
It is divided into a duct chamber 5 into which outside air enters, and a blow-by gas chamber 7 having a blow-by gas recirculation port 6.

In this embodiment, the partition wall 8 is formed of a partition plate. As shown in FIGS. 1A and 2, a first partition wall 8a for partitioning the clean room 4 and the blow-by gas chamber 7 is provided. ,
A second partition wall 8b that partitions the blow-by gas chamber 7 and the duct chamber 5 and a third partition wall 8c that partitions the clean room 4 and the duct chamber 5 are provided. The second partition wall 8b is provided in close contact with an end of the upper plane 19 of the filter element 3 on the side of the outside air inlet 18, and an opening 20 is formed in the second partition wall 8b.
Is formed, the blow-by gas in the blow-by gas chamber 7 flows through the filter element 3 to the clean room 4 as in the blow-by gas flow path 9. In addition,
In the embodiments, the upper plane 19 corresponds to the same plane in the first invention. In the area of the filter element 3 that faces the air outlet 16 of the clean room 4, a fuel return prevention plate 21 is provided to prevent the blown back fuel such as gasoline from being absorbed by the filter element 3. I have.

The operation of the air cleaner having the above configuration will be briefly described. The air sucked into the duct chamber 5 from the outside air intake 18 of the air cleaner 1 is filtered by the filter element 3.
Flows from the side surface 12 to the first area 22 which is a far side of the upper flat surface 19 facing the clean room 4 like the outside air flow path 10, and is sucked into the engine side from the air outlet 16 of the clean room 4. On the other hand, the blow-by gas flowing into the blow-by gas chamber 7 from the blow-by gas recirculation port 6 is
b from the opening 20 provided in the filter element 3 through the second region 23 which is a surface on the near side of the upper flat surface 19 facing the blow-by gas chamber 7.
And reaches the clean room 4.

As described above, the filter element 3 is formed in a flat shape (for example, a flat rectangular shape or a flat cylindrical shape), and the filter element 3 is moved to the side opposite to the outside air inlet 18 of the air cleaner 1. And the duct chamber 5 is provided on the side of the flat filter element 3,
By providing the first partition wall 8 a, the upper flat surface 19 is partitioned into a first region 22 facing the clean room 4 and a second region 23 facing the blow-by gas chamber 7, and is separated from the duct room 5. By providing the first region 22 farther than the second region 23, the region where the blow-by gas passage 9 and the outside air passage 10 overlap can be increased, and fine dust and the like contained in the outside air can be sufficiently removed. it can.

Further, by providing the openings 20 provided in the second partition wall 8b so as to be arranged in parallel with the outside air intake 18, in most regions of the filter element 3 into which the air sucked from the outside air intake 18 flows. Since the blow bar gas is sucked through the opening 20, dust in the air sucked from the outside air intake 18 can be removed in the entire area of the filter element 3.

[Brief description of the drawings]

FIG. 1A is a longitudinal sectional view of an air cleaner according to an embodiment of the present invention, and FIG. 1B is a transverse sectional view taken along line BB of FIG.

FIG. 2 is a schematic perspective view for explaining a configuration of a filter element and a partition wall.

FIG. 3 is a plan view of a partition wall.

FIG. 4 is a longitudinal sectional view showing a conventional configuration of an air cleaner configured to return blow-by gas from a blazer device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Air cleaner, 2 ... Casing, 3 ... Filter element, 4 ... Clean room, 5 ... Duct room, 6 ... Blow-by gas recirculation port, 7 ... Blow-by gas room, 8 ... Partition wall, blow bar gas flow path, 10 ... External air flow Path, 11... Flush with filter element.

Claims (3)

[Claims] 1. Placing a single filter element (3) in a casing (2) of an air cleaner (1),
At least a clean room (4) and a duct room inside the air cleaner (1)
In the engine air cleaner sectioned in (5), the blow-by gas chamber provided with the blow-by gas recirculation port (6)
A partition wall (8) for partitioning (7) from the clean room (4) and the duct room (5) is provided, and the presence of the partition wall (8) reduces blow-by gas in the blow-by gas chamber (7). Clean room via blowbar gas flow path (9) in filter element (3)
An air cleaner for an engine, wherein the air cleaner is formed to reach (4). 2. The air cleaner for an engine according to claim 1, wherein the filter element is disposed from the duct chamber (5).
An air cleaner for an engine, wherein the blow bar gas passage (9) is formed so as to overlap with an outside air passage (10) reaching a clean room (4) through (3). 3. The air cleaner for an engine according to claim 2, wherein the cleaning chamber (4) and the blow-by gas chamber (7) are provided in contact with the same plane of the filter element (3), and are substantially orthogonal to the same plane. Of filter element (3)
A duct chamber (5) is provided on the side of (12), a blow-by gas chamber (7) is provided on the same plane as a surface close to the duct chamber (5), and the clean room (4) is provided in a blow-bar gas chamber ( An engine air cleaner provided on a surface farther from the duct chamber (5) than 7).