JP2595184Y2 - Resonator - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to an intake pipe of an internal combustion engine and the like.
The present invention relates to a resonator provided in a gas passage tube constituting a gas passage to reduce noise propagating in the gas passage tube, and more particularly to a Helmholtz resonance type resonator.

[0002]

2. Description of the Related Art A Helmholtz resonance type resonator which is provided in a gas passage tube constituting a gas passage and reduces noise propagating in the gas passage tube is conventionally known. As shown in FIG. 4, for example, the resonator has a resonance box having a predetermined volume in a branch pipe 103 connected to an internal combustion engine 100 mounted on a vehicle and branched from a middle of an intake pipe 102 as a gas passage pipe. The communication between the resonance box 10 and the resonance box 10
5 is reduced by the resonance action. In FIG. 4, reference numeral 109 denotes an intake manifold, and 110 denotes an air cleaner.

It is known that the resonance frequency of such a resonator is determined by Equation 1 in a configuration as schematically shown in FIG.
Alternatively, by selecting the lengths L and L 'and the cross-sectional area (diameter) S of the branch pipe 103, the noise of the selected frequency F out of the noise propagating in the intake pipe 102 can be silenced.

F = α√ (S · L / (V−S · L ′)) F: resonance frequency V: volume of resonance box S: cross-sectional area of branch pipe L: length of branch pipe L ′: branch Length of tube inserted into resonance box α: constant

[0004] In such a resonator, it is desired that the resonance frequency can be arbitrarily set by using a common resonance box or branch pipe. That is, when the resonator is applied to an internal combustion engine of a vehicle as shown in FIG. 4, when the displacement of the internal combustion engine, the type of a mounted vehicle, and the like are changed, the frequency of the intake noise to be silenced is also changed. Therefore, it is necessary to newly set the resonance frequency F of the resonator. At this time, it is desirable to use a common resonance box and branch pipe in order to prevent an increase in cost due to the change of the resonance box and the branch pipe.

In view of the above, a resonator capable of changing the muffling frequency while using a common resonance box and branch pipe has been proposed in, for example, Japanese Utility Model Publication No. 61-9174.

As shown in FIG. 2, a resonator described in Japanese Utility Model Publication No. Sho 61-9174 has a branch pipe 203 branching from the middle of an intake pipe 202 of an internal combustion engine (not shown). The resonance tube 205 is inserted into the resonance tube 205, and the resonance box 205 is airtightly held and fixed to the branch tube 203 to form the resonator 201.
The resonance frequency of the resonator 201 can be arbitrarily set depending on the degree of insertion into the resonance box 205.

At this time, a rubber packing 207 is attached to the opening 206 of the resonance box 205 in advance, and the branch pipe 203 is compressed while compressing the rubber packing 207.
Is inserted into the opening 206 to hold and fix the resonance box 205 to the branch tube 203 in an airtight manner.

[0008]

However, in the configuration shown in FIG. 2, the resonator 20 which can arbitrarily change the resonance frequency while using the common resonance box 205 and the branch pipe 203 is used.
1 can be obtained, but when the resonance box 205 is mounted, in addition to the space corresponding to the entire height of the resonance box 205, A work space is required to add the length of the branch pipe L 'of the portion inserted into the resonance box 205 (shown by a broken line in FIG. 2), and particularly to a device required to be compact, such as an internal combustion engine for a vehicle. There is a problem with the application of.

In the configuration shown in FIG.
Since the branch pipe 203 is inserted into the opening 206 of the resonance box 205 by the length L 'while compressing the pressure 7, the drag resistance applied to the rubber packing 207 is very large, and the mounting workability is poor.

In view of the above problems, the present invention can set the resonance frequency according to the frequency of the noise to be silenced using a common resonance box and a branch pipe, and can make the space required for the mounting work. The object of the present invention is to provide a resonator that can save space as much as possible and has good mounting workability.

[0011]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is directed to an opening which is attached to a branch pipe branched from a gas passage pipe constituting a gas passage, and into which an end of the branch pipe is inserted. A resonance box comprising: a resonance box having an opening; and a packing provided at an opening of the resonance box and having elasticity for airtightly holding an end of the branch pipe and the opening of the resonance box.
In the gas turbine, the packing is formed with a pipe portion extending in an axial direction of the branch pipe and inward of the resonance box.

[0012]

[Function] The present invention is attached to the opening of the resonance box,
The packing for airtightly holding the end of the branch pipe and the opening of the resonance box is provided with a pipe extending in the axial direction of the branch pipe and inward of the resonance box. In the state in which is attached to the branch pipe, the length of the branch pipe is substantially extended. That is, even if the length of the branch pipe is suppressed to be short, the substantial length of the branch pipe can be obtained as long as is necessary and sufficient for noise reduction.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to FIG. FIG. 1 is a cross-sectional view of a main part of a resonator 1 according to the present invention. In an intake pipe 2 connected to an internal combustion engine (not shown), an end 4 of a branch pipe 3 branched from a predetermined location has resonance. Box 5
Is sealed airtight by a packing 7 attached to the opening 6, and the packing 7 has a pipe portion 8 extending in the axial direction of the branch pipe 3 and inward of the resonance box 5. It is formed integrally.

Here, the packing 7 and the pipe portion 8 are formed of rubber, and the cross-sectional area S 'of the pipe portion 8 is formed to be equal to the cross-sectional area S of the branch pipe 3 and the opening of the branch pipe 3 is formed. When the end 4 is inserted into the opening 6 of the resonance box 5, the packing 7 is compressed at a predetermined compression ratio, so that the resonance box 5 is airtightly held and fixed to the branch pipe 3.

The resonator 1 constructed as described above is
The volume V of the resonance box 5, the length L and the cross-sectional area S of the branch pipe 3
By setting the length L 'and the cross-sectional area S' (= S) of the pipe portion 8 to the resonance frequency F shown in the above equation 1, the noise of the frequency F out of the intake noise of the internal combustion engine is silenced. can do. In the present embodiment, since a part of the branch pipe connecting the intake pipe 2 and the resonance box 5 is constituted by the pipe part 8 formed integrally with the packing 7,
By preparing several types of packings 7 having different lengths L 'of the pipe section 8, the specifications of the internal combustion engine are changed, and even when the frequency to be silenced changes, simply by replacing the packings 7, it is easy. It is possible to respond. That is, it is possible to obtain the resonator 1 which can set the resonance frequency F according to the specification of the internal combustion engine while sharing the resonance box 5 and the branch pipe 3 having a large change cost.

In this embodiment, the packing 7 integrally formed with the pipe portion 8 is attached to the opening 6 of the resonance box 5 in advance, and the end portion 4 of the branch pipe 3 is provided.
Is inserted into the opening 6 so that the resonance box 5 is airtightly held and fixed to the branch pipe 3. Therefore, it is possible to obtain a branch pipe length required for silencing while eliminating the need for an assembling work space (broken line portion in FIG. 2) corresponding to the length L 'of the pipe section 8, which was conventionally required.

Further, in this embodiment, since only the end 4 of the branch pipe 3 is inserted into the opening 6 of the resonance box 5, the drag resistance applied to the packing 7 when the branch pipe 3 is inserted. Is small, and the mounting workability is greatly improved.

In this embodiment, the cross-sectional area S of the branch pipe 3 and the cross-sectional area S 'of the pipe portion 8 are equal to each other.
As long as the function of the data is not impaired, there is no problem even if a slight error occurs between them. The packing 7 and the pipe portion 8 are preferably made of rubber. It is also conceivable to form.

As described above, the embodiment in which the resonator according to the present invention is applied to an internal combustion engine has been described. However, the present invention is not limited to the embodiment, and for example, a suction / discharge pipe connected to a compressor. In addition, it is needless to say that the present invention can be applied to all gas passage pipes constituting a gas passage, such as an air duct of an air conditioner.

[0020]

As described above, the resonator according to the present invention has the following effects. That is, the present invention is mounted on a branch pipe branched from a gas passage pipe constituting a gas passage, and has a resonance box having an opening into which an end of the branch pipe is inserted, and a resonance box provided at an opening of the resonance box. An elastic packing for keeping the end of the branch pipe and the opening of the resonance box airtight, wherein the packing is provided in the axial direction of the branch pipe and the resonance box. In order to form a pipe part extending inward, by preparing several types of packings with different lengths of the pipe part,
Even when the frequency of the noise to be silenced is changed, it is possible to easily cope with it simply by replacing the packing. That is, it is possible to obtain a resonator which can be set to an arbitrary resonance frequency while sharing a resonance box or a branch pipe having a large change cost.

Further, in the present invention, the packing provided with the pipe portion is attached in advance to an opening of the resonance box, and an end of the branch pipe is inserted into the opening, so that the resonance box is attached to the resonance box. Since it is held and fixed to the branch pipe in an airtight manner, an installation work space corresponding to the length of the pipe portion, which was conventionally required, becomes unnecessary, and space saving can be achieved.

Further, according to the present invention, since only the end of the branch pipe to be inserted into the opening of the resonance box is at its end, the drag resistance applied to the packing is small, and the mounting workability is greatly improved. I do.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a resonator according to the present invention.

FIG. 2 is a sectional view of a main part of a conventional resonator.

FIG. 3 is a schematic diagram illustrating the operation of a Helmholtz resonance type resonator.

FIG. 4 is a schematic diagram showing an internal combustion engine to which a Helmholtz resonance type resonator is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resonator which applied this invention 2 Intake pipe 3 Branch pipe 4 Branch pipe end 5 Resonance box 6 Resonance box opening 7 Packing 8 Pipe part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 58-172050 (JP, U) Japanese Utility Model Showa 63-162188 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) F02M 35/12 F01N 1/02

Claims (1)

(57) [Scope of request for utility model registration] 1. A resonance box which is attached to a branch pipe branched from a gas passage pipe constituting a gas passage and has an opening into which an end of the branch pipe is inserted, and a resonance box provided at the opening of the resonance box. An elastic packing for keeping the end of the branch pipe and the opening of the resonance box airtight, wherein the packing is provided in the axial direction of the branch pipe and the resonance box. A resonator having a pipe portion extending inward.