JPH0127253B2 - - Google Patents

Abstract

PURPOSE:To produce suction noise without affecting engine performance by forming an air intake port with a duct, and providing an acoustic material layer on the inner surface of the duct. CONSTITUTION:Air intake ports respectively formed by a duct 3 are provided at two positions on the upper side of a cleaner element 2 installed in a casing 1. In addition, an air outlet 4 is provided on the lower side of the cleaner element 2, which outlet 4 is connected to a carburetor 5 is connected to a suction port of an engine. A layer 6 of an acoustic material such as urethane foam is provided on the inner surface of the duct 3, while an aggregate 7 comprising a punching plate is provided on the inner surface of the layer 6 to prevent the acoustic material 6 from being deformed. Hereby, a suction sound can be attenuated, which is produced owing to air vibration and chatter of the casing 1 without substantially changing a shape of the air cleaner.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the structure of an air cleaner that cleans the intake air of an engine, and in particular, the present invention relates to the structure of an air cleaner that cleans the intake air of an engine. The present invention relates to the structure of an air cleaner suitable for mounting on a vehicle.

[Conventional technology]

Air cleaners are used to clean intake air in the engines of automobiles, motorcycles, three-wheeled vehicles, three-wheeled vehicles, four-wheeled vehicles, and various industrial machines.

The air purified by the air cleaner is mixed with fuel in the carburetor and then sucked into the combustion chamber.

Air cleaners for such engines generally have a cleaner element made of air filtering material installed inside the casing, an air intake on the dirt side (before passing through the element), and an air outlet on the clean side (after passing through the element). and has a structure for connecting the air outlet to the vaporizer.

In this type of air cleaner, air flow generates intake noise, which can cause noise. As a countermeasure, the air intake is formed with a duct, and the acoustic resistance of the duct and the A method of reducing noise using sound absorbing means has been adopted.

[Technical problem to be solved by the invention]

By the way, in air cleaners for engines of riding vehicles such as motorcycles, three-wheeled vehicles, and four-wheeled vehicles, the opening at the end of the duct, which serves as an air intake, is used to remove dust and rain from the upper center of the vehicle body, such as the fuel tank or under the seat. It is required to be located in a space with clean air where it is difficult for foreign substances to enter, and since vehicle body space is limited, it is easy to secure installation space for other parts and has an excellent intake noise reduction effect. is requested.

An object of the present invention is to provide an air cleaner that can meet the above-mentioned various demands and is particularly suitable for installation in the engines of motorcycles, three-wheeled vehicles, and four-wheeled vehicles.

[Means for solving problems]

The present invention provides an air cleaner in which the inside of a sealed casing is partitioned into a dirt side and a clean side by a cleaner element made of an air filter material, an air intake port is provided on the dirt side, and an air outlet is provided on the clean side. , two ducts each having a rectangular cross section, the dirt side being formed in the upper part of the casing and the clean side being formed in the lower part, and the air intake port extending from the left and right portions of the dirt side to the air outlet side; Furthermore, a layer of sound absorbing material made of urethane etc. is provided on the inner surface of each duct,
By supporting the inner surface of this sound-absorbing material layer with aggregate made of punching plates or mesh,
This aims to achieve the above objectives.

〔Example〕

The present invention will be specifically described below with reference to the drawings.

FIG. 1 is a partially cutaway perspective view of an embodiment of an air cleaner according to the present invention, and FIG. 2 is a longitudinal sectional view of the air cleaner of FIG. 1. FIG.

In FIGS. 1 and 2, a casing 1 is formed of a hermetically sealed box, and the inside of the casing 1 is divided into upper and lower parts by a cleaner element 2 made of an air filtering material.
It is divided into two spaces.

Near the upper end of the casing 1 is a space (dirt side) above the cleaner element 2.
Two ducts 3, 3 are provided which communicate with each other.

On the other hand, an air outlet 4 is provided on the front surface of a portion of the casing 1 that forms a space below the cleaner element 2 (clean side).

The air outlet 4 is connected to a carburetor 5, as shown in FIG. 2, and the carburetor 5 is connected to an intake port (not shown) of the engine.

Therefore, when the engine is running, the negative air pressure of the engine causes external air to flow through the air intake (ducts 3, 3), the dirt side, as shown by the arrow.
It is sucked in through the cleaner element 2, the clean side, the air outlet 4 and the vaporizer 5.

The two ducts 3, 3 protrude from the left and right sides of the upper end of the casing 1 forming the dirt side toward the air outlet 4, and in the illustrated example, the left and right ducts 3, 3 and the air outlet 4 extend approximately parallel to each other.

Further, the cross section of each duct (air intake port) 3, 3 is square (rectangular).

A layer 6 of sound absorbing material such as urethane foam is provided on the inner surface of each duct 3,3. Further, an aggregate 7 made of a punching plate is provided on the inner surface of the sound absorbing material layer 6 to prevent deformation of the sound absorbing material 6.

The casing 1 can be made of metal or plastic, for example, and the ducts 3, 3
can be made of rubber-like elastic material in addition to metal or plastic. Furthermore, the aggregate 7 can be made of metal or plastic.

According to the embodiment described above, the ducts 3, 3 forming the air intake port are arranged so as to extend from both left and right sides of the upper end of the casing 1 in substantially the same direction as the air outlet 4, so that the air cleaner can be automatically operated. When installed on the engine of a two-wheeled vehicle, three-wheeled motor vehicle, or four-wheeled vehicle, the ducts 3, 3 can be easily guided to a relatively high position within the vehicle body frame, directly below the fuel tank or seat. Then,
It is easy to inhale air with little dust and close to atmospheric temperature.

In addition, in the case of motorcycles, the carburetor 5 is usually placed in front of the air cleaner, and the layout is such that the rear part of the fuel tank is located above the carburetor. duct 3,
3 is provided at a very suitable position for guiding the fuel to the lower side of the fuel tank along the left and right main frames of the vehicle body frame.

In addition, since each of the left and right ducts 3 has a rectangular cross section, it is easier to secure a sufficient cross-sectional area (air flow rate) even inside a narrow vehicle body like a motorcycle, compared to other shapes such as circular cross sections. be.

Furthermore, since the air intake is formed by the ducts 3, 3, and a layer 6 of a sound absorbing material such as urethane foam is provided on the inner surface of the ducts 3, 3, air vibrations and chatter of the casing 1 are generated. Intake noise can be effectively attenuated.

In this case, connect the air intake to two ducts 3, 3.
With this configuration, the surface area of the sound absorbing material 6 can be increased relative to the air flow rate (flow path cross-sectional area), and the effect of reducing intake noise can be increased accordingly.

Furthermore, since the inner surface of the sound-absorbing material layer 6 is supported by the aggregate 7 formed by a punching plate, deformation and displacement of the sound-absorbing material layer can be prevented even if the sound-absorbing material layer is soft or thin. Materials can be selected freely.

In the illustrated embodiment, the sound-absorbing material layer 6 and the aggregate 7 are formed into a cylindrical shape and are provided all around the inner surface of the duct 3, but they may also have a cross-sectional shape with a portion of the shape removed. .

Further, the length of the duct 3 and the ratio of the installed lengths of the sound-absorbing material layer 6 and the aggregate 7 to the duct 3 can also be selected as appropriate.

Furthermore, the aggregate 7 can also be formed using a metal or plastic mesh instead of the punched plate as shown.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, a dirt side is formed in the upper part of the air cleaner casing, a clean side is formed in the lower part, and the air intake port is projected from the left and right parts of the dirt side toward the air outlet side. It is formed by two extending ducts with a rectangular cross section, and a layer of sound-absorbing material made of urethane or the like is provided on the inner surface of each duct, and the inner surface of this layer of sound-absorbing material is supported by an aggregate made of punching plates or mesh. When installed in the engine of a motorcycle, three-wheeled vehicle, or four-wheeled vehicle, it is extremely convenient to guide each duct to the fuel tank or under the seat to inhale air with less dust and near atmospheric temperature. Moreover, an air cleaner can be obtained which is advantageous when disposed through a narrow space, and which can increase the area of the sound-absorbing material compared to the amount of intake air to enhance the effect of reducing intake noise.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway external perspective view of an air cleaner according to an embodiment of the present invention, and FIG. 2 is a longitudinal cross-sectional view taken along the line - in FIG. 1. 1... Casing, 2... Cleaner element, 3... Duct (air intake), 4... Air outlet, 6... Sound absorbing material layer, 7... Aggregate.

Claims (1)

[Claims] 1. In an air cleaner in which the inside of a sealed casing 1 is partitioned into a dirt side and a clean side by a cleaner element 2 formed of an air filtering material, an air intake port is provided on the dirt side, and an air outlet 4 is provided on the clean side. , the dirt side is formed in the upper part of the casing 1, and the clean side is formed in the lower part, and the air intake port protrudes and extends from the left and right portions of the dirt side toward the air outlet 4 side.
It is formed of ducts 3, 3 with a square cross section, and furthermore, a layer 6 of sound absorbing material made of urethane or the like is provided on the inner surface of each duct 3, 3, and the inner surface of this layer 6 of sound absorbing material is made of a punching plate or mesh. An air cleaner characterized by being supported by aggregate 7.