JP3226585U - Silencer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a silencer capable of preventing a fibrous material from jumping out from a filling hole to prevent pushing-in work or welding failure without deteriorating the sound absorbing effect of a sound absorbing material, and having an excellent sound deadening effect. A silencer having a filling hole for filling a fibrous material, wherein the filling hole is formed by a vertical wall 6a by burring, and the inner diameter of the tip of the vertical wall rises. The inside diameter of the part is 0.7 times or more and 0.9 times or less. After filling the fiber material, the lid 8 is attached to the filling hole. [Selection diagram] Fig. 3

Description

The present invention relates to a silencer provided in an exhaust pipe of an automobile or the like.

Conventionally, as a silencer provided in an exhaust pipe of an automobile or the like, a fiber material such as glass wool having a function of a sound absorbing material is solidified and surrounded by a binder on the outer periphery of an exhaust pipe having a large number of ventilation holes penetrating at predetermined positions. It is known that the surrounding area is surrounded by an outer shell.

In this case, the high-temperature, high-pressure exhaust gas passing through the exhaust pipe repeatedly acts on the fiber material through the ventilation hole, so that the silencing effect is exhibited. Therefore, there is a problem that the fibrous material gradually deteriorates and is sucked into the exhaust gas through the ventilation hole, scatters to the outside air, and pollutes the environment. Further, there is a problem that the scattering of the fiber material reduces the weight of the fiber material in the silencer and reduces the sound deadening effect.

In recent years, in order to prevent such scattering of the fiber material, a method of using a long fiber material such as glass fiber as a sound absorbing material and directly filling the long fiber material into the body has been used. By using the long fiber material, the silencer can be directly filled into the silencer, the manufacturing cost can be suppressed, and the fiber material can be prevented from scattering from the ventilation hole, so that it is possible to provide a silencer having an excellent silencing effect.

A method of directly filling the interior space of the silencer with the long fiber material is to provide a filling hole in the body, insert a filling nozzle into the filling hole, and provide a pressure difference between the exhaust pipe and the body to provide the interior space of the body. Directly fill the long fiber material. When the filling of the long fiber material is completed, the filling hole is closed with a lid, and the periphery of the lid is fixed by welding.

US Pat. No. 6,158,547

However, in the above-described silencer filling hole structure of Patent Document 1, the long fiber material jumps out from the filling hole at the time of filling or when the filling is completed, or the long fiber material laminated in the body protrudes from the filling hole by its own repulsive force. There is a problem that ends up. If the long fiber material protrudes from the filling hole, it is necessary to push it in with a human hand or a jig. Also, if the lid is covered with the long fiber material protruding from the filling hole, the long fiber material may be caught in an unintended portion such as the welding mating surface, causing welding failure, and the lid may be securely fixed to the body. However, there is a problem that the sound deadening effect is impaired.

The present invention has been made in order to solve such a problem, and a silencer having an excellent silencing effect, which can prevent the fiber material from protruding from the filling hole to prevent the pushing operation and the welding failure, is provided. The purpose is to provide.

The invention according to claim 1 is a silencer having a filling hole for filling a fibrous material, wherein the filling hole is formed by a vertical wall by burring, and the inner diameter of the tip of the vertical wall is the vertical direction. It is characterized in that the inside diameter of the rising portion of the wall is 0.7 times or more and 0.9 times or less.

According to a second aspect of the invention, in addition to the structure of the first aspect, a folded portion is formed at the tip of the vertical wall toward the inner circumference of the filling hole.

According to a third aspect of the invention, in addition to the configuration of the first or second aspect, the surface around the burring portion is configured to form an inclination toward the outer periphery of the silencer when the silencer is mounted on the vehicle. Characterize.

According to the first aspect of the present invention, the filling hole is formed by the vertical wall, so that the fibrous material can be prevented from jumping out to the welding portion, and the work of pushing the fibrous material back into the body is unnecessary. When the lid is attached to the filling hole after filling with the fibrous material, the side surface portion of the lid can be positioned so as to fit outside the vertical wall, and the filling hole can be easily closed by the lid. Work efficiency can be improved.

Further, by setting the inner diameter of the tip portion of the vertical wall to be 0.7 times or more and 0.9 times or less of the inner diameter of the rising portion of the vertical wall, it is possible to more effectively prevent the fiber material from jumping out to the welding portion. Therefore, the fibrous material is not caught between the lid for welding and the outer periphery of the filling hole, and welding failure can be prevented, so that welding can be reliably performed.

According to the second aspect of the present invention, the folded portion formed at the tip of the vertical wall of the filling hole can press the filled fibrous material to prevent the popping out of the filling hole more effectively. As a result, the fiber material can be prevented from jumping out to the welding point, and the welding can be reliably performed without causing the welding failure due to the fiber material being caught between the lid for welding and the outer periphery of the filling hole. It will be possible.

According to the third aspect of the present invention, the surface around the burring portion of the filling hole is formed to be inclined toward the silencer outer periphery when the silencer is mounted, so that even if water is splashed, the water is easily discharged to the silencer outer periphery. It is possible to prevent rusting around the filling hole.

FIG. 3 is a vertical cross-sectional view showing a main part of the silencer of the present invention. FIG. 2 is a schematic view showing a silencer of the present invention filled with a fiber material. It is a principal part expanded sectional view which shows the state which attached the cover to the filling hole of 1st Example. It is a principal part expanded sectional view which shows the state which attached the cover to the filling hole of 2nd Example. It is a general view which shows the filling hole peripheral part of 2nd Example.

Embodiments of the present invention will be described below with reference to the drawings. Note that the following description of the embodiments is merely an exemplification, and is not intended to limit the present invention, its application, or its use.

The silencer 1 of this embodiment is provided in an exhaust system of an internal combustion engine of an automobile, and as shown in FIG. 1, a pipe 2 and bodies 3a and 3b provided outside the pipe, and a predetermined lengthwise direction inside the bodies 3a and 3b. A partition plate 4 which is provided in plural at the above-mentioned part and is fixed to the pipe 2 and the bodies 3a and 3b; and a fibrous material 5 which is filled between the pipe 2, the partition plate 4 and the bodies 3a and 3b. ..

The pipe 2 has a cylindrical shape and a large number of ventilation holes 2a are formed on the peripheral surface thereof. The noise in the exhaust gas passing through the pipe 2 is absorbed by the fiber material 5 through the ventilation hole 2a.

The body 3 is composed of an upper body 3a and a lower body 3b obtained by pressing a thin metal plate, and by joining the opposing peripheral portions of the two bodies 3a and 3b together, a substantially elliptical cross section having an internal space is formed. Has been formed. Hereinafter, the entire body including the upper body 3a and the lower body 3b is referred to as a body 3. A pipe 2 penetrates the body 3 of the silencer 1 and is arranged from the outside of the body toward the inside. The silencer body 2 according to the present invention has a so-called monaca fitting structure composed of an upper body 2a and a lower body 2b. The silencer body 2 according to the present invention has a so-called monaca fitting structure composed of an upper body 2a and a lower body 2b.

The partition plates 4 are provided at two predetermined positions in the longitudinal direction of the body 3 for each pipe. Partition plates 4 are arranged at both ends of the portion of the pipe 2 where the vent hole 2a is formed, and a closed space is formed between the partition plate 4 and the body 3. The partition plate 4 is provided with a large number of ventilation holes 4a at predetermined positions on the partition plate 4, and a through hole 4b through which the pipe 2 penetrates is provided at substantially the center of the partition plate 4. An inner space surrounded by the upper body 3a, the lower body 3b, the pipe 2 and the partition plate 4 is filled with a fibrous material 5 having a function as a sound absorbing material.

In the partition plate 4, the through hole 4b of the partition plate 4 and the outer periphery of the pipe 2 are fixed by MIG welding. The partition plate 4 and the lower body 3b are spot welded, and the partition plate 4 and the upper body 3a are MIG welded, respectively. It is fixed.

The fiber material 5 is a long fiber material having a sound absorbing function. The fiber material 5 absorbs noise of exhaust gas passing through the ventilation hole 2a of the pipe 2 and the ventilation hole 4a of the partition plate 4. As the fiber material 5, it is preferable to use a long fiber material such as a glass fiber material such as glass fiber, but a long fiber material that functions as a sound absorbing material other than the glass fiber material may be used.

As shown in FIG. 2, a filling hole 6 for filling the fibrous material 5 is provided in the upper body 3a. The filling hole 6 has a vertical wall 6a formed by burring as shown in FIG. Since the filling hole 6 is formed by the vertical wall 6a, the vertical wall 6a acts as a wall that prevents the fibrous material 5 from popping out around the filling hole, so that the fibrous material 5 can be prevented from popping out to the welding site. .. Further, when the lid 8 is attached to the filling hole 6 after filling the fibrous material 5, the side surface portion 8b of the lid 8 can be positioned so as to fit to the outside of the vertical wall 6a, and the positioning property of the lid 8 is improved. The work efficiency can be improved.

Further, the inner diameter of the tip portion of the vertical wall 6a is 0.7 times or more and 0.9 times or less the inner diameter of the rising portion of the vertical wall 6a. Since the inner diameter of the tip portion is narrower than the inner diameter of the rising portion, it is possible to more effectively prevent the fibrous material 5 from protruding from the filling hole, and when the lid 8 is closed, the fibrous material 5 to the welding portion can be prevented. Bite can be suppressed. The grounds for the lower limit 0.7 and the upper limit 0.9 of the ratio of the inner diameter of the tip portion to the inner diameter of the rising portion are as follows.
When the upper limit of 0.9 is exceeded and the inner diameter of the tip portion increases, the function of the vertical wall 6a as a wall that prevents the fiber material 5 from popping out decreases, and it becomes impossible to sufficiently prevent the fiber material 5 from popping out. Further, when the lower limit of 0.7 is exceeded and the inner diameter of the tip portion becomes small, it becomes impossible to secure a sufficient inner diameter for inserting the filling nozzle 7 for filling the fibrous material. That is, the ratio of the inner diameter that can prevent the fiber material 5 from popping out while ensuring the inner diameter required for inserting the filling nozzle 7 is in the range of the lower limit 0.7 to the upper limit 0.9.

A folded-back portion 6b is formed at the tip of the vertical wall 6a toward the inner circumference of the filling hole 6. As a result, the fibrous material 5 can be prevented from jumping out to the outside of the body 3, and the fibrous material 5 will not be caught between the lid 8 for welding and the outer periphery of the filling hole 6 to cause welding failure without fail. It becomes possible to perform welding.
In this embodiment, the ratio of the inner diameter of the tip portion to the inner diameter of the rising portion is 0.79, and the height of the vertical wall 6a is 3 mm.

The lid 8 is a member that closes the filling hole 6 filled with the fiber material 5 from the outside of the upper body 3a. As shown in FIG. 3, the lid 8 has a hat-shaped cross-sectional shape, a flat flange portion 8a on the outer peripheral side, a side surface portion 8b rising from the inner peripheral edge of the flange portion 8a, and a side surface portion 8b. It has a flat closing portion 8c that closes the peripheral side. The side surface portion 8b of the lid 8 is formed at an angle along the rising portion of the vertical wall 6a of the filling hole 6a, and is formed so as to fit with the filling hole 6. The lid 8 having such a shape is manufactured by, for example, press molding.

The outline of the process of manufacturing the silencer 1 of the present embodiment will be described. First, the assembly of the silencer 1 is completed except for the filling of the fiber material 5. (This assembly process is a general process, and therefore the description thereof is omitted.) Next, as shown in FIG. 2, the filling hole 6 is filled in the space surrounded by the pipe 2, the bodies 3a and 3b, and the partition plate 4. The fibrous material 5 is fed from the filling nozzle 7 inserted into the container to fill the fibrous material 5. In the step of filling the fibrous material 5, the vertical wall 6a formed in the filling hole 6 of the upper body 3a acts as a wall that prevents the fibrous material 5 from jumping out of the body 3, so that the fibrous material 5 is filled. It is possible to prevent the welded portion on the outer periphery of the hole 6 from entering. Further, by forming the folded portion 6b at the tip of the vertical wall 6a of the filling hole 6, it is possible to more effectively prevent the fiber material 5 from entering the welded portion.

After filling the fibrous material 5, the lid 8 is placed in the filling hole 6 as shown in FIG. When the lid 8 is arranged, the side surface portion 8b of the lid 8 is arranged to fit on the outer peripheral portion of the vertical wall 6a. Then, the outer periphery of the flange portion 8a of the lid 8 is fixed by MIG welding. By closing the filling hole 6 with the lid 8 in this manner, the filling process of the fiber material 5 is completed and the silencer 1 is completed.

A second embodiment of the present invention will be described with reference to FIGS. In the silencer 1 of the present embodiment, the surface 6c around the burring portion of the filling hole 6 is formed as a surface having an inclination α toward the outer periphery of the silencer in the silencer mounted state as shown in FIG. As a result, even if water is splashed on the vicinity of the lid 8 or the filling hole 6, the water does not remain on the outer periphery of the silencer and is discharged in the direction of the arrow shown in FIG. Therefore, it is possible to prevent rust from forming around the filling hole.

1 Silencer 2 Pipe 3 Body 4 Partition Plate 5 Fiber Material 6 Filling Hole 7 Filling Nozzle 8 Lid

Claims (3)

A silencer having a filling hole for filling a fiber material,
The filling hole is formed by a vertical wall by burring, and the inner diameter of the tip portion of the vertical wall is 0.7 times or more and 0.9 times or less the inner diameter of the rising portion of the vertical wall,
Silencer characterized by. Forming a folded portion toward the inner periphery of the filling hole at the tip of the vertical wall,
The silencer according to claim 1, wherein: The surface around the burring portion is configured to form an inclination toward the outer circumference of the silencer when the silencer is mounted on the vehicle.
The silencer according to claim 1 or claim 2.

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