JP2002317719A - Air cleaner for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save space and improve a silencing effect in an air cleaner for an engine having a built-in resonator. SOLUTION: An upper case 17 and a lower case 18 form an air cleaner chamber 20, in which a cleaner element 21 is mounted. The lower case 18 has a partition wall 22 in a lower section to form a resonance chamber 23. The upper case 17 has an outlet pipe 21A. An inlet pipe 24 is inserted in the lower case 18, and the inlet pipe 24 and the resonance chamber 23 are interconnected by a resonance tube 25. An air intake from the inlet pipe 24 is filtered in the cleaner element 21 and supplied to the outlet pipe 21A. A resonance effect of the resonance chamber 23 reduces intake noise. The integral formation of the resonance chamber 23 in the lower section of the lower case 18 saves space. The arrangement of the resonance chamber 23 upstream of the air cleaner chamber 20 allows a large volume of the air cleaner chamber 20 to reflect downstream intake pulsation and thus improve a resonance induction effect.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air cleaner having a built-in resonator mounted on an intake device of an engine of an automobile or the like.

[0002]

2. Description of the Related Art An air intake device for an engine of an automobile or the like is provided with an air cleaner for filtering dust and the like in the atmosphere, and a resonator for reducing intake noise.
(Resonant silencer) is installed. An example of an air cleaner and a resonator mounted on a conventional automobile engine will be described with reference to FIG.

As shown in FIG. 6, an air cleaner 1 forms an air cleaner chamber with an upper case 2 and a lower case 3.
An air cleaner element 4 is interposed between them. An outlet hose 6 connected to an upstream side of a throttle body (not shown) is connected to an outlet 5 of the upper case 2,
A second suction pipe 9 is connected to an inlet 7 of the lower case 3 via a grommet 8. A first suction pipe 10 is further connected to a tip of the second suction pipe 9, and an inlet 11 of the first suction pipe 10 is opened to the atmosphere.

At the side of the second suction pipe 9, first and second resonance tubes 12, 13 are branched and protruded. A first resonator 14 and a second resonator 15 having different capacities are connected to the first and second resonance tubes 12 and 13 on the upstream side and the downstream side, respectively. These air cleaner 1, the first and second resonators 14, 15 and the first and second suction pipes
10 and 9 are shaped to take into account the limited space in the engine room of the car.

With this configuration, the first suction pipe 10
The intake air sucked from the inlet 11 of the air cleaner passes through the first suction pipe 9 and flows into the air cleaner chamber of the air cleaner 1, and after dust and the like are filtered by the air cleaner element 4, the air passes through the outlet hose 6 and the throttle body. Supplied to At this time, low-frequency and high-frequency intake noises can be effectively reduced by the first and second resonators 14 and 15 having different volumes, that is, different resonance frequencies. Further, since the first and second resonators 14 and 15 are arranged on the upstream side of the air cleaner 1 which is a large volume element, the resonance supercharging effect by the intake pipe on the downstream side of the air cleaner 1 can be sufficiently exhibited, The volume efficiency can be increased to improve the performance of the engine.

Conventionally, various air cleaners have been proposed in which a resonator is built in an air cleaner case to save space (for example, Japanese Utility Model Laid-Open No. 6-49760 and Japanese Patent Laid-Open No. 9-268954). reference).

[0007]

However, the above-mentioned conventional air cleaner and resonator have the following problems. In the one shown in FIG. 6, the first and second resonators 1
Since 4 and 15 are provided separately from the second suction pipe 9, it is difficult to secure sufficient capacity in the limited space in the engine room, and the degree of freedom in layout is limited. small. On the other hand, in Japanese Unexamined Utility Model Publication No. 6-49760, since the resonator is disposed downstream of the air cleaner, the pulsation of the intake air is reflected by the volume of the resonator, so that the resonance supercharging effect is reduced. Further, in the configuration described in JP-A-9-268954, when adjusting characteristics such as the resonance frequency of the resonator, it is necessary to change the length and arrangement of the partition plate in the air cleaner case,
It is very time-consuming.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to provide an air cleaner for an engine that can achieve space saving and a high noise reduction effect with a simple structure.

[0009]

According to a first aspect of the present invention, there is provided an air cleaner for an engine, wherein an air cleaner chamber is formed by an upper case and a lower case, and an air cleaner chamber is provided between the upper case and the lower case. A cleaner element is arranged in the lower case, an outlet pipe is connected to the upper case, a partition is provided in the lower case, a resonance chamber is formed in a lower portion of the lower case, and an inlet pipe is inserted into the lower case to communicate with the air cleaner chamber. The inlet pipe and the resonance chamber are communicated with each other by a resonance tube in the lower case. With this configuration, the intake air flowing into the air cleaner chamber from the inlet pipe is filtered by the cleaner element and flows out from the outlet pipe. At this time, the intake noise is reduced by the resonance effect of the resonance chamber integrally formed in the lower case and disposed upstream of the air cleaner chamber. An air cleaner for an engine according to a second aspect of the invention is characterized in that, in the configuration of the first aspect, the cleaner element is arranged in a substantially flat shape in a substantially horizontal direction. With this configuration, it is difficult for the cleaner element and the resonance chamber to interfere with each other on the layout. An air cleaner for an engine according to the invention of claim 3 is characterized in that, in the configuration of claim 1 or 2, the inlet pipe is inserted above the resonance chamber of the lower case. With this configuration, the volume of the resonance chamber can be increased. An air cleaner for an engine according to a fourth aspect of the present invention is characterized in that, in the configuration of the first or second aspect, the inlet pipe is inserted into the air cleaner chamber through the resonance chamber and the partition. . With this configuration, the inlet pipe can be supported by the partition wall, and the inlet pipe can be firmly supported. Further, in the air cleaner for an engine according to the invention of claim 5, in the configuration according to any one of claims 1 to 4, the resonance chamber is partitioned into a plurality of resonance chambers, and each resonance chamber and the inlet pipe are provided in a plurality. Are connected by a resonance tube. With this configuration, a plurality of resonance frequencies can be set.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. A first embodiment of the present invention will be described with reference to FIG. 1 and FIG. As shown in FIGS. 1 and 2, an air cleaner 16 according to the present embodiment includes an upper case 17 made of a synthetic resin and a lower case 18 having a substantially box shape with one side opened, and a lower case 18 connected to each other by a plurality of clamps 19. A chamber 20 is formed, and a flat plate-like air cleaner element 21 is mounted between the upper case 17 and the lower case 18. A cylindrical outlet pipe 21A that communicates with the air cleaner chamber 20 in the upper case 17 protrudes from a side surface of the upper case 17.

A partition 22 extending in a substantially horizontal direction is provided in the lower case 18, and a resonance chamber 23 is formed at the lower end of the lower case 18 by the partition 22. A cylindrical inlet pipe 24 disposed above the partition wall 22 and extending in a substantially horizontal direction is hermetically inserted into the side surface of the lower case 18 and communicates with the air cleaner chamber 20 in the lower case 18. The inlet pipe 24 is connected to the outlet pipe 21 of the upper case 17.
It is projected in the same direction as A. In the lower case 18, the inlet pipe 24 and the resonance chamber 23 are connected to each other by a cylindrical resonance tube 25.

The operation of the embodiment constructed as described above will be described below. The air cleaner 16 is disposed in the engine room of the automobile, a suction hose (not shown) is connected to the inlet pipe 24, the inlet side of the suction hose is opened to the atmosphere, and an outlet hose is connected to the outlet pipe 21A. The outlet pipe is connected to the inlet side of an intake device of the engine such as a throttle body.

Then, from the inlet pipe 24 to the air cleaner chamber.
After the air introduced into 20 passes through the air cleaner element 21 to remove dust and the like, it is sent from the outlet pipe 21A to the intake device of the engine. At this time, the intake noise is reduced by the resonance effect of the resonance chamber 23 connected to the inlet pipe 24 by the resonance pipe 25. The resonance chamber 23 is provided with the air cleaner chamber 20.
Is connected to the inlet pipe 24 on the upstream side, the large volume of the air cleaner chamber 20 can reflect the pulsation of the intake pipe on the downstream side, and the resonance supercharging effect can be sufficiently exhibited. Efficiency can be increased to improve engine performance.

By forming the resonance chamber 23 in the lower case 18 and integrating the air cleaner and the resonator, these can be reduced in size and the degree of freedom in the layout in the engine room can be increased. Also, the length L of the insertion portion of the inlet pipe 24, the mounting position M of the resonance tube 25, the length
By changing N, diameter D and the volume of the resonance chamber 23,
Since the characteristics of the resonator such as the resonance frequency can be easily changed, the characteristics of the resonator can be appropriately set according to the type of vehicle and the like, and the noise reduction effect can be enhanced.

In the above embodiment, the case where a single resonance chamber is provided as an example is described. In addition, the resonance chamber is divided into a plurality of resonance chambers, and each resonance chamber and the entrance passage are formed. Communication can also be achieved by a plurality of resonance tubes.
In this case, the resonance frequency can be made to correspond to the intake noise having a plurality of peaks of different frequencies, and the silencing effect can be enhanced.

Next, a second embodiment of the present invention will be described with reference to FIG.
A description will be given with reference to FIG. In the following description, the same parts as those of the first embodiment are denoted by the same reference numerals, and only different parts will be described in detail.

As shown in FIGS. 3 to 5, in the air cleaner 26 according to the second embodiment, the inlet pipe 27 is hermetically inserted from the bottom of the lower case 18 and extends substantially in the vertical direction to form the resonance chamber. The distal end portion penetrates through the partition wall 22 and is hermetically inserted into the partition wall 22 to open into the air cleaner chamber 20. Also,
As shown in FIG. 5, the resonance chamber 23 is a partition wall 2 including an inlet pipe.
By 8, it is partitioned into two resonance chambers 23A and 23B having different volumes. In the resonance chamber 23, the inside of the inlet pipe 27 and the two resonance chambers 23A and 23B
Resonance tubes 29 and 30 for communicating with each other are projected.

With this configuration, the first
As in the embodiment, a suction hose is connected to the inlet pipe 27 and opened to the atmosphere, and the air introduced into the air cleaner chamber 20 from the inlet pipe 27 is supplied to the air cleaner element 21.
After being filtered through the outlet pipe, it is sent from the outlet pipe 21A to the intake device of the engine.

The intake noise is reduced by the resonance effect of the resonance chambers 23A and 23B connected to the inlet pipe 27 by the resonance pipes 29 and 30. At this time, the intake noise at two frequencies having different peaks can be reduced by the resonance effect of the two resonance chambers 23A and 23B having different volumes (resonance frequencies), so that the noise reduction effect can be enhanced. In this case, too, by changing the length of the insertion portion of the inlet pipe 27, the mounting position of each of the resonance tubes 29, 30, the length, the diameter, and the volume of each of the resonance chambers 23A, 23B, the resonator such as the resonance frequency can be easily formed. Can be changed, so that the characteristics of the resonator can be appropriately set according to the type of vehicle and the like, and the noise reduction effect can be enhanced.

In this embodiment, the case where the resonance chamber 23 is divided into two resonance chambers 23A and 23B is described as an example. In addition, the resonance chamber 23 is appropriately divided into three or more resonance chambers. Partitioning is also possible, whereby the resonance frequency can be made to correspond to the intake noise having three or more different frequency peaks, and the noise reduction effect can be enhanced.

[0021]

As described in detail above, according to the engine air cleaner according to the first aspect of the present invention, the resonance chamber is integrally formed in the lower case, so that space can be saved. In addition, since the resonance chamber is arranged upstream of the air cleaner chamber, pulsation of the intake pipe on the downstream side can be reflected by a large volume of the air cleaner chamber, and the resonance supercharging effect can be enhanced. According to the air cleaner for an engine according to the invention of claim 2, since the cleaner element is formed in a substantially flat plate shape and is disposed in a substantially horizontal direction,
The cleaner element and the resonance chamber do not easily interfere with each other, and the volume of the resonance chamber can be increased. According to the air cleaner for an engine according to the third aspect of the present invention, the volume of the resonance chamber can be increased by inserting the inlet pipe above the resonance chamber of the lower case. According to the air cleaner for an engine according to the invention of claim 4, since the inlet pipe is inserted into the air cleaner chamber through the resonance chamber and the partition wall, the inlet pipe can be supported by the partition wall, and the inlet pipe is firmly supported. be able to. Claims
According to the air cleaner for an engine according to the fifth aspect of the invention, since a plurality of resonance frequencies can be set by a plurality of resonance chambers, the resonance frequency can be made to correspond to intake noise having a plurality of peaks of different frequencies. It can enhance the silencing effect.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view taken along line AA in FIG. 2 showing a schematic configuration of an air cleaner according to a first embodiment of the present invention.

FIG. 2 is a front view of the air cleaner shown in FIG.

FIG. 3 is a longitudinal sectional view taken along line BB in FIG. 4 showing a schematic configuration of an air cleaner according to a second embodiment of the present invention.

FIG. 4 is a front view of the air cleaner shown in FIG.

FIG. 5 is a cross-sectional view taken along line CC of FIG. 4;

FIG. 6 is an exploded perspective view of an air cleaner and a resonator mounted on a conventional engine intake device.

[Explanation of symbols]

 16,26 Air cleaner 17 Upper case 18 Lower case 20 Air cleaner room 21 Cleaner element 21A Outlet pipe 22 Partition wall 23,23A, 23B Resonance room 24,27 Inlet pipe 25,29,30 Resonance tube

Claims (5)

[Claims] An air cleaner chamber is formed by an upper case and a lower case, a cleaner element is disposed between the upper case and the lower case, an outlet pipe is connected to the upper case, and a partition is provided in the lower case. A resonance chamber is formed at a lower portion of the lower case, an inlet pipe is inserted into the lower case to communicate with the air cleaner chamber, and the inlet pipe and the resonance chamber are communicated with each other by a resonance pipe in the lower case. Engine air cleaner. 2. The cleaning device according to claim 1, wherein the cleaner element has a substantially flat shape and is arranged in a substantially horizontal direction.
An air cleaner for an engine according to claim 1. 3. The air cleaner for an engine according to claim 1, wherein the inlet pipe is inserted above the resonance chamber of the lower case. 4. The engine air cleaner according to claim 1, wherein the inlet pipe is inserted into the air cleaner chamber through the resonance chamber and the partition. 5. The resonance chamber according to claim 1, wherein the resonance chamber is divided into a plurality of resonance chambers, and each resonance chamber and the inlet pipe are communicated with each other by a plurality of resonance pipes. Engine air cleaner as described.