JP3343871B2 - Resonant silencer in the intake system of a car engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resonance muffler for muffling an intake sound of an automobile engine, and more particularly, to a structure in which a plurality of resonance mufflers required for an intake system are formed into a single resonance muffler. The present invention relates to a resonance silencer for an intake system of an automobile engine.

[0002]

2. Description of the Related Art In the intake system of an automobile engine,
Generally, a plurality of resonance silencers having a silencing function with respect to intake sounds in a plurality of frequency ranges are required as resonance mufflers for muffling intake sound for reasons such as commercial power and legal regulations. Conventionally known resonance silencers of this type include a prior art example in which a resonator chamber type resonance muffler 10 and a side branch type resonance muffler 11 shown in FIG. A prior example in which two Helmholtz-type resonance silencers 12 and 13 shown in (B) are combined is known.

[0003]

In recent automobiles, however, the space in the engine room tends to be narrowed in order to generally improve the livability in the passenger compartment. In the engine room, diversification and expansion of devices such as power steering and air conditioners are being further promoted, so the space in the engine room is becoming smaller and smaller, while the equipment space is large. You are restricted. For this reason, the installation space of the resonance silencer provided in the intake system is also limited, and it is currently difficult to equip the resonance silencer.

The present invention has been proposed in view of the above-mentioned circumstances, and a plurality of resonance silencers conventionally required for an intake system are formed into a single resonance silencer to form an engine room. It is an object of the present invention to provide a resonance muffler for an intake system of an automobile engine, which facilitates outfitting of the vehicle.

[0005]

In order to achieve the above-mentioned object, a resonance silencer according to the present invention has a required length L in the middle of an intake pipe communicating with an intake manifold inlet of an engine, A single resonator housing partitioned into a first chamber having a height h1, a second chamber having a height h2, and a third chamber having a height h3 by dividing the inside into a plurality of upper and lower partitions. Is arranged and inserted into the first chamber of the housing so as to cross the intake pipe, and a single small hole is formed in the first chamber of the intake pipe, and is branched at a right angle from the back of the opening position of the small hole. And a branch pipe having a required pipe diameter d which is inserted into the third chamber over a length of a required insertion margin δ while traversing the second chamber and traversing the second chamber. Slit with required gap α in branch pipe A single-hole Helmholtz resonance reducing function that reduces intake noise in a low frequency range by a small hole opened in the intake pipe in the first chamber, and a branch pipe opened in the second chamber. Slit-type Helmholtz resonance silencing function that reduces the intake sound in the middle frequency range by the slit, and insertion-type Helmholtz resonance silencing function that reduces the intake frequency in the high-frequency range by the insertion allowance δ at the branch pipe tip opening in the third chamber. It is characterized in that the sound can be muffled by combining the functions.

Further, the present invention has another feature that
The respective height ratios h1, h2, h3 of the third chamber, the length L of the resonator housing, the pipe diameter d of the branch pipe and the dimensional ratio of the gap α of the slit opened in the branch pipe are given by h1>h2> h3. h1 + h2 + h3 = Hh1 <L (.alpha. / d) <0.30-0.41.

[0007]

According to the resonance muffler of the present invention configured as described above, low-frequency intake noise (muffled sound) can be reduced in the first chamber, and medium-frequency intake noise (method) can be reduced in the second chamber. Regulation) can be reduced, and further, high-frequency intake noise (legal regulation) can be reduced in the third chamber. As a result, a wide range of intake noise from low frequency to high frequency can be combined and silenced in a single resonator housing, so that a plurality of silencing functions required for the intake system are required for reasons of product power and legal regulations. The resonance muffler provided can be configured as a single resonance muffler, and the resonance muffler can be made more compact.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a resonance silencer according to one embodiment of the present invention, in which 1 is an intake sound source (engine), 2 is an intake pipe connected thereto, and this intake pipe 2 is shown. It is not connected to the intake manifold of the engine.

A single resonator housing 3 having a length L and a required width is disposed in the middle of the intake pipe 2. The interior of the housing 3 is vertically moved by two partition walls 4 and 5. A first partition having a height h1 at an upper stage, which is divided into multiple stages;
A chamber A and a second chamber B having a height h2 in the middle stage
And a third chamber C having a height h3 in the lower part are vertically formed adjacent to each other.

The intake pipe 2 is inserted into the first chamber A of the housing 3 so as to traverse the inside thereof. A hole 6 is opened, and the intake pipe 2 at a position where the small hole 6 is opened.
Is provided with a branch pipe 7 having a pipe diameter d branched at right angles from the pipe direction. This branch pipe 7 has its tip opening inserted into the third chamber C for the length of the insertion margin δ across the inside of the second chamber B, and branches off across the inside of the second chamber B. The tube 7 is provided with a slit 8 located inside the second chamber B and having a gap α.

A first section defined inside the housing 3
The height of each of the chamber A, the second chamber B, and the third chamber C is defined so as to have a dimension ratio of h1>h2> h3, and the volume of the first chamber A is equal to the other second and third chambers. The maximum is secured compared to the chambers B and C. Further, the volume of the second chamber B having the slit 8 opened is ensured to be larger than the volume of the third chamber C. Also, the height H and length L of the housing 3 and the heights h1, h2, h3 of each chamber
In this relation, h1 + h2 + h3 = H and h1 <L.

Further, the gap α of the slit 8 is (α / d) <0.30-0.0 in relation to the pipe diameter d of the branch pipe 7.
An insertion margin δ is provided at the opening at the distal end of the branch pipe 7 which is formed to have a dimensional ratio of 41 and is inserted into the third chamber C.

Next, the operation of the resonance silencer constructed as described above will be described with reference to FIGS. 2 (A), 2 (B) and 2 (C). The intake air taken into the intake manifold (not shown) of the engine through the intake pipe 2 is supplied to the resonator housing 3.
When passing through the first chamber A, a part of the intake air is diffused and expanded into the first chamber A through the small holes 6, and a first resonance effect is obtained in this process. At this time, small hole 6
When the opening cross-sectional area is reduced, the effect of reducing the intake sound (muffled sound) in a low frequency range is obtained, and here, the resonance silencing effect of the single-hole Helmholtz shown in FIG. 2A is obtained.

A part of the intake air passing through the intake pipe 2 flows into the branch pipe 7, and is diffused and expanded into the second chamber B through the slit 8 opened in the branch pipe 7, and in this process, A second resonance effect is obtained. At this time, the relationship between the gap α of the slit 8 and the pipe diameter d of the branch pipe 7 is (α / d) <
When the relationship is set to 0.30 to 0.41, the effect of reducing the intake sound in the middle frequency range is obtained. In this case, the resonance sound-elimination effect of the slit-type Helmholtz shown in FIG. 2B is obtained.

Further, the intake air flowing to the branch pipe 7 is
Flows into and diffuses into the third chamber C through the opening at the tip end, and a third resonance effect is obtained during the expansion process. At this time, if the insertion margin δ of the opening at the tip end of the branch pipe 7 is increased, the effect of reducing the intake noise in the high frequency range is obtained. In this case, the resonance silencing effect of the insertion type Helmholtz shown in FIG. Is obtained.

As described above, according to the resonance muffler of the present invention, the resonance muffling effect of the single-hole Helmholtz that can reduce the intake sound (muffled sound) in a low frequency range in a single resonator housing. And, the resonance silencing effect of the slit type Helmholtz that can reduce the intake sound in the middle frequency range and the resonance type silencing effect of the insertion type Helmholtz that can reduce the intake sound in the high frequency range can be obtained, from the low frequency range to the high frequency range. Since a wide range of intake noise can be combined and silenced, multiple resonance silencers conventionally required for intake systems for reasons of product appeal, legal regulations, etc. are combined into a single resonance silencer Therefore, since the resonance silencer can be made more compact, the effect of facilitating outfitting even in a narrow engine room can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a resonance silencer according to one embodiment of the present invention.

FIGS. 2A and 2B separately show chambers formed in a resonator housing, wherein FIG. 2A is a first chamber and FIG.
(C) is a configuration diagram of a third chamber.

FIGS. 3A and 3B are perspective views of a resonance silencer provided in a conventional intake system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Intake sound source 2 Intake pipeline 3 Resonator housing 4,5 Partition wall 6 Small hole 7 Branch pipe 8 Slit A First chamber B Second chamber C Third chamber α Slit gap δ Insertion allowance

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F02M 35/12 F01N 1/02

Claims (2)

(57) [Claims] 1. A first portion having a required length L in the middle of an intake pipe communicating with an intake manifold inlet of an engine, and having a height h1 divided into a plurality of upper and lower stages by a plurality of partition walls.
A second chamber having a height h2, and a height h
A single resonator housing defining a third chamber having a third chamber, wherein the single resonator housing is inserted into the first chamber of the housing so as to cross the intake pipe, and a single resonator housing is provided in the first chamber of the intake pipe. Branching at a right angle from the back of the opening position of the
A branch pipe having a required pipe diameter d inserted in the third chamber over a length of a required insertion margin δ across the inside of the chamber and a branch pipe crossing the second chamber. A slit having a gap α is opened, and a single-hole Helmholtz resonance silencing function for reducing intake noise in a low frequency range by a small hole opened in the intake pipe in the first chamber; Slit-type Helmholtz resonance silencing function that reduces intake noise in the middle frequency range by slits opened in the branch pipe, and insertion that reduces intake noise in the high-frequency range by inserting margin δ at the branch pipe tip opening in the third chamber. A resonance silencer for an intake system of an automobile engine, wherein the resonance silencer has a configuration capable of silencing by combining the resonance silencing function of a Helmholtz type. 2. The heights h1, h2, h2 of the first to third chambers.
h3, the length L of the resonator housing, and the pipe diameter d of the branch pipe.
And the respective dimensional ratios of the gaps α of the slits opened in the branch pipe are set so as to satisfy the following relationship: h1>h2> h3h1 + h2 + h3 = Hh1 <L (.alpha. / D) <0.30-0.41 The resonance silencer for an intake system of an automobile engine according to claim 1, wherein: