JP2899872B2 - Mounting structure of silencer for intake pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an installation structure of a muffler for an intake pipe of an internal combustion engine (hereinafter referred to as an engine), and more particularly, a combustion explosion sound inside the engine is amplified by an air cleaner through an intake pipe. To prevent noise from increasing.

[0002]

2. Description of the Related Art It is known to use a honeycomb structure silencer (also serving as a rectifier) for an intake pipe or an air cleaner in order to reduce explosion sound transmitted through an intake pipe of an engine. This muffler mounting structure was formed as shown in FIG. 7 as an example. That is, the air cleaner 1
A muffler mounting seat is formed on the inner peripheral surface of the air outlet pipe 2 and a muffler 6 is fitted therein. Then, a stopper 10 is attached to an annular groove formed at the opening edge of the air outlet pipe 2. Further, the other end opening of the elastic hose 5 whose one end is connected to an intake pipe (not shown) is fitted on the outer periphery of the air outlet pipe 2. Then, the elastic hose 5 and the air outlet pipe 2 are airtightly fastened and fixed by the band 9.

[0003]

In such a conventional mounting structure of a muffler for an intake pipe, the muffler 6 directly receives an engine explosion sound and vibrates.
Strictly required fitting accuracy between the outer circumference of the air outlet pipe 2 and the inner circumference of the air outlet pipe 2. Therefore, the fitting portion of the air outlet pipe 2 needs to be processed by cutting or the like, which is troublesome. In addition, the silencer 6 has a honeycomb structure therein, and the honeycomb structure and the silencer main body 6a are integrally brazed in a high-temperature furnace, so that it is difficult to maintain the roundness strictly. Met. Therefore, in such an installation structure of a muffler for an intake pipe, a muffler 6 that can be easily and accurately attached to the air outlet pipe 2 and a mounting structure with a higher muffling effect have been desired. The present invention has the following configuration in order to solve the problem.

[0004]

The installation structure of the muffler for an intake pipe according to the present invention comprises an air outlet pipe 2 of an air cleaner 1.
And an intake pipe silencer 6 connected between the other end of the intake pipe 4 whose one end is guided to the engine 3.
The silencer 6 has a silencer main body 6a whose inside is formed in a honeycomb structure and whose outer periphery is formed in a cylindrical shape,
A cylindrical elastic packing 7 is fitted and fixed on the outer periphery of the silencer main body 6a, the air outlet tube 2 of the air cleaner 1 is fitted on the outer periphery of the elastic packing 7, and the outer periphery of the air outlet tube 2 is further fitted. One end of the elastic hose 5 is fitted onto the elastic hose 5, and the outer periphery of the elastic hose 5 is airtightly fastened and fixed.
The other end of the elastic hose is connected to the intake pipe 4.

According to a second aspect of the present invention, in the first aspect of the present invention, the elastic packing 7 has thick portions 7a and thin portions 7b formed on the outer periphery alternately in the circumferential direction. On the inner periphery, each thin portion 7 of the elastic packing 7
The ribs 2a protrude respectively at positions matching the b. The outer radius of the thin portion 7b of the elastic packing 7 is formed to be larger than the inner radius of at least the root of the rib 2a of the air outlet pipe 2. In addition, the outer diameter of the thick portion 7a of the elastic packing 7 is
It is formed to have a diameter equal to or greater than the inner diameter of the portion excluding a.

According to a third aspect of the present invention, in the second aspect, the width of the rib 2a in the circumferential direction is smaller than the thickness of the thin portion 7
The rib 2a is formed to be narrower than that of b, and the amount of protrusion of the rib 2a in the radial direction is gradually reduced toward the opening side. In the fourth aspect of the present invention, in the first aspect, a flange-like portion 7c protrudes from an outer periphery of an end of the elastic packing 7 on the side of the intake pipe 4, and the air outlet pipe is provided on the flange-like portion 7c. The two end faces are configured to abut. As described above, in the mounting structure of the muffler for an intake pipe according to the present invention, the air outlet pipe 2 is fitted around the muffler 6 via the elastic packing 7.
The production accuracy of the outer periphery of the silencer 6 and the inner periphery of the air outlet tube 2 does not need to be strict. That is, those production errors can be absorbed by the elastic packing 7. At the same time, the explosive sound energy transmitted from the engine to the silencer 6 via the intake pipe is absorbed by the elastic deformation of the elastic packing 7,
The silencing effect of the silencer 6 itself can be increased.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a main part of the present structure, FIG. 2 is a sectional perspective view of a muffler 6 and an elastic packing 7, and FIG.
4 is a sectional view taken along the line III-III in FIG. 4, FIG. 4 is a schematic sectional view taken along the line IV-IV in FIG. 3, and FIG. 5 is an enlarged view of a portion V in FIG. FIG. 6 is a partially cutaway explanatory view of the mounting structure. The attachment structure of the present invention is particularly different from the conventional type in that an annular elastic packing 7 is fitted around the muffler 6, and the muffler 6 is connected to the inner periphery of the air outlet pipe 2 via the elastic packing 7. It is a point that is fitted to the. The elastic packing 7 has an inner periphery formed in a cylindrical shape, a flange-like portion 7c provided at one end of the outer periphery, and a thick portion 7a and a thin portion 7b on the outer peripheral surface.
Are formed alternately in the circumferential direction. Further, a middle thick portion 7d is formed at the center in the width direction of the thick portion 7a. Such an elastic packing 7 is made of natural rubber or synthetic rubber having rubber elasticity, and is manufactured by integral molding. Then, the inner periphery of the elastic packing 7 is fitted around the outer periphery of the muffler 6, and the both are joined and fixed by an adhesive or other means.

Next, a large number of ribs 2a are provided on the inner peripheral surface of the air outlet pipe 2 so as to project in parallel with the axial direction. The pitch of the ribs 2a matches the pitch of the thin portion 7b of the elastic packing 7. The width of the rib 2a in the circumferential direction is the thin portion 7
It is formed significantly narrower than that of b. Further, the amount of protrusion of the rib 2a in the radial direction is formed to be smaller at the opening end thereof. When the air outlet pipe 2 is fitted on the outer periphery of the elastic packing 7, the rib 2a is inserted into the thin portion 7b, and the root of the rib 2a presses the thin portion 7b to slightly elastically deform the thin portion 7b. Next, the radius on the outer surface of the thick portion 7a is formed slightly larger than the radius of the inner circumference of the air outlet pipe 2. Air outlet tube 2
Protrusions 2b protrude from the outer periphery at equal intervals. The silencer 6 has a honeycomb structure inside, a flat metal plate and a corrugated metal plate are formed in a spiral shape to form a core, and a cylindrical silencer body 6a is fitted around the core. ing. The space between the flat plate and the corrugated plate of the core and the space between the core and the silencer main body 6a are integrally brazed and fixed in a high-temperature furnace.

The flange-like portion 7c of the elastic packing 7
Is substantially equal to the outer radius of the air outlet tube 2. The elastic packing 7 thus formed is fitted on the outer periphery of the silencer 6, and the inner periphery of the air outlet tube 2 is fitted on the outer periphery. As shown in FIG. 3, the rib 2a protruding from the inner periphery of the air outlet pipe 2 is press-fitted into the thin portion 7b, and the rib 2a of the air outlet pipe is formed.
The inner peripheral surface other than is pressed against the thick portion 7a of the elastic packing 7,
The rear ends of the thick portion 7a and the thin portion 7b are slightly elastically deformed. The fitted state is formed as shown in FIG.
Then, the end face of the air outlet pipe 2 comes into contact with the flange-like portion 7c of the elastic packing 7. Next, an open end of a bellows-shaped elastic hose 5 is fitted to the outer periphery of the air outlet pipe 2, and a fastening band 8 is fitted around the outer periphery thereof and fastened and fixed. At this time, the open end of the elastic hose 5 is connected to the air outlet pipe 2.
Is positioned in contact with the tip of the projection 2b. The other end of the elastic hose 5 is fitted to the open end of the intake pipe 4 of the engine 3 as shown in FIG.

[0010]

In the mounting structure of the muffler for an intake pipe according to the present invention, the air outlet pipe 2 of the air cleaner 1 is fitted to the outer periphery of the muffler 6 via the cylindrical elastic packing 7 so that the air intake pipe is fitted. When the explosion sound of the engine 3 transmitted through the pipe 4 reaches the silencer 6, the shock wave is absorbed by the elastic packing 7, and the sound absorbing effect is enhanced. That is, when the explosion sound of the engine collides with the honeycomb silencer 6 via the intake pipe 4, the energy of the shock wave is absorbed by the honeycomb structure itself when passing through the honeycomb structure, and a part of the energy is absorbed by the silencer. Elastic packing 7 via main body 6a
And is absorbed by the elastic deformation of the elastic packing 7 in the radial and axial directions. As a result, the explosion sound of the engine is prevented as much as possible from reaching the air cleaner,
The sound emitted from the air cleaner can be reduced. In addition, in this mounting structure, since the silencer 6 is connected to the air outlet pipe 2 of the air cleaner 1 via the cylindrical elastic packing 7, errors in the manufacturing dimensions of the air outlet pipe 2 can be easily absorbed. The mounting structure can be easily manufactured and easily assembled.

Next, according to a second aspect of the present invention, thick portions 7a and thin portions 7b are alternately formed on the outer periphery of the elastic packing 7 in the circumferential direction, and the ribs 2a of the air outlet pipe 2 are located on the thin portions 7b. At the same time, since the inner peripheral surface of the air outlet tube 2 is fitted to the thick portion 7a, the axis of the silencer 6 and the axis of the air outlet tube 2 can be easily aligned. Further, in the third aspect of the present invention, the width of the rib 2a in the circumferential direction is reduced to the thin portion 7b.
Of the air outlet pipe 2 around the outer periphery of the elastic packing 7 because the rib 2a is formed to be narrower than that of
Can be mounted more easily, the elastic deformation of the elastic packing 7 can be made easier, and the explosive sound absorbing capacity of the engine can be further increased. According to the fourth aspect of the present invention, a flange-like portion 7c is provided on the outer periphery of the end of the elastic packing 7 on the intake pipe 4 side,
Since the end face of the air outlet pipe 2 is configured to abut on the flange-shaped portion 7c, it is possible to prevent the explosion sound of the engine from being directly transmitted to the end face of the air outlet pipe 2 and to make the air outlet pipe 2 and the elastic packing 7 Can be more easily positioned.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part of the present structure.

FIG. 2 is a cutaway perspective view of a muffler 6 and an elastic packing 7 having the same structure.

FIG. 3 is a partially cutaway explanatory view of the same structure,
-III arrow view.

FIG. 4 is a schematic sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is an enlarged view of a portion V in FIG. 4;

FIG. 6 is a partially cutaway explanatory view of the mounting structure.

FIG. 7 is a longitudinal sectional view of a conventional structure for mounting a silencer for an intake pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air cleaner 2 Air outlet pipe 2a Rib 2b convex part 3 Engine 4 Intake pipe 5 Elastic hose 6 Silencer 6a Silencer main body 7 Elastic packing 7a Thick part 7b Thin part 7c Flange part 7d Medium thick part 8 Fastening band 9 Band 10 stopper

Continued on the front page (72) Inventor Tetsuo Ishii 3-25-3 Yoyogi, Shibuya-ku, Tokyo Inside Toyo Radiator Co., Ltd. (72) Inventor Fumio Suzuki 35-2-3, Yoyogi, Shibuya-ku, Tokyo Toyo Radiator Stock In-house (56) References JP-A 49-49330 (JP, U) JP-A 59-122489 (JP, U) JP-A 56-8849 (JP, U) (58) Fields surveyed (Int. . ^6, DB name) F02M 35/14 F02M 35/024 521 F02M 35/10

Claims (4)

(57) [Claims] 1. A mounting structure of an intake pipe silencer 6 connected between an air outlet pipe 2 of an air cleaner 1 and the other end of an intake pipe 4 whose one end is guided to an engine 3, wherein the silencer 6 comprises: A silencer body 6a having a honeycomb structure inside and an outer periphery formed in a cylindrical shape is provided. A cylindrical elastic packing 7 is fitted and fixed on the outer periphery of the muffler body 6a. The air outlet pipe 2 of the air cleaner 1 is fitted to the outer periphery of the air hose, and one end of an elastic hose 5 is fitted to the outer periphery of the air outlet pipe 2, and the outer periphery of the elastic hose 5 is airtightly fastened and fixed. And
The other end of the elastic hose (5) is connected to the intake pipe (4). 2. The elastic packing 7 according to claim 1, wherein
In the outer periphery, thick portions 7a and thin portions 7b are alternately formed in the circumferential direction, and ribs 2a are formed on the inner periphery of the air outlet pipe 2 at positions corresponding to the respective thin portions 7b of the elastic packing 7. Each of the elastic packings 7 is formed so that the outer peripheral radius of the thin portion 7b is larger than the inner peripheral radius of at least the root of the rib 2a of the air outlet pipe 2.
The muffler mounting structure for an intake pipe, wherein an outer diameter of the thick portion 7a is formed to be equal to or larger than an inner diameter of a portion of the air outlet pipe 2 excluding the rib 2a. 3. The method according to claim 2, wherein the width of the rib 2a in the circumferential direction is formed narrower than that of the thin portion 7b, and the amount of protrusion of the rib 2a in the radial direction is gradually reduced toward the opening side. The installation structure of the silencer for the intake pipe. 4. The air packing according to claim 1, wherein a flange-like portion is protruded from an outer periphery of an end of the elastic packing on a side of the intake pipe, and an end face of the air outlet pipe is brought into contact with the flange-like portion. Configured to touch,
Mounting structure of silencer for intake pipe.