JP2517534Y2 - Muffler finisher mounting structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a finisher mounting structure for a muffler, and more particularly to a finisher mounting structure for a muffler capable of preventing generation of abnormal noise due to looseness of the finisher mounting.

[Conventional technology]

The internal combustion engine is provided with an exhaust system for guiding the exhaust gas discharged from the combustion chamber to the outside. This exhaust system is composed of exhaust system components such as an exhaust manifold, an exhaust pipe, an exhaust purification device, a muffler, and a tail pipe, for example. A tubular finisher is attached to the end portion of the tail pipe extending from the muffler constituting the exhaust system.

The finisher is mounted on the end portion of the tail pipe and is attached by forming an air passage between the inner peripheral surface of the finisher and the outer peripheral surface of the end portion of the tail pipe. Thereby, the outside air flowing through the air passage is mixed with the high-temperature exhaust gas discharged from the opening of the tail pipe for cooling. That is, it functions as a diffuser.

As such a muffler finisher mounting structure,
There is one shown in FIG. In the figure, 102 is a tail pipe and 104 is a finisher. The tubular finisher 104, which is externally mounted on the terminal end portion 106 of the tail pipe 102, has an inner peripheral surface 108 of the finisher 104 and an outer peripheral surface 1 of the tail pipe 102.
It is attached by forming an air passage 112 with respect to 10. The finisher 104 is provided with a pressing bolt 116 as a pressing mechanism 114 supported by a support 118 so as to be rotatable and immovable in the axial direction. The outer peripheral surface 110 of the tail pipe 102 is provided with a seat surface 122 for receiving the tip 120 of the pressing bolt 116.

Note that reference numeral 124 is a holding unit. The holding portion 124 holds the finisher 104 in the opening 126 of the tail pipe 102.

At the time of mounting, the tubular finisher 104 is put on the end portion 106 of the tail pipe 102, and the tip 1 of the pressing bolt 116 is attached.
18 is brought into contact with the seating surface 122 of the outer peripheral surface 110 of the tail pipe 102 and rotated. As a result, the end portion 106 of the tail pipe 102 is
The cylindrical finisher 104 that is externally mounted on the
By pressing the tail pipe 102, an air passage 112 is formed between the inner peripheral surface 108 of the finisher 104 and the outer peripheral surface 110 of the tail pipe 102 to be attached.

The muffler finisher mounting structure is the sixth
As shown in the figure, some are attached by a belt type clamp 202. The clamp 202 is composed of a belt portion 204 and a tightening mechanism 206, and each end portion 208, 210 of the belt portion 204 is tightened by a tightening bolt 212 and a nut 214 of the tightening mechanism 206 to be attached.

Incidentally, Japanese Utility Model Publication No. 55-83420 discloses that the finisher is attached to the tail pipe in a floating manner by supporting the finisher via a cushioning member to a support member fixed to the muffler. There is.

[Problems to be solved by the invention]

However, in the mounting structure disclosed in FIG.
The tip 118 of the pressing bolt 116 is the outer peripheral surface 110 of the tail pipe 102.
There is a case where it does not fit on the seating surface 122, and there is a disadvantage that the mounting is apt to be loosened. Further, since the finisher 104 is attached to the tail pipe 102 by pressing it with the pressing bolt 116 in a cantilever manner, there is a problem that noise such as chattering noise is likely to occur. Moreover, the air passage 1 between the inner peripheral surface 108 of the finisher 104 and the outer peripheral surface 110 of the tail pipe 102.
Since only the pressing bolt 116 is located at 12, there is a disadvantage that foreign matter such as pebbles easily enters the air passage 112.

Further, in the mounting structure disclosed in FIG. 6, the clamp 202 which is a separate component including the belt portion 204, the tightening mechanism 206, and the like.
However, there is an inconvenience that the cost increases.

[Purpose of device]

Therefore, an object of the present invention is to provide a finisher, which is installed on the end portion of a tail pipe extending from a muffler of an internal combustion engine exhaust system, between the inner peripheral surface of the finisher and the outer peripheral surface of the end portion of the tail pipe. In the finisher mounting structure of the muffler that is installed by forming the air passage, it is possible to prevent the generation of abnormal noise due to looseness of the mounting, and to form between the inner peripheral surface of the finisher and the outer peripheral surface of the tail pipe end. Another object of the present invention is to realize a muffler finisher mounting structure which can prevent foreign matter from entering the air passage to be cut and can reduce the cost.

[Means for solving problems]

In order to achieve this object, the present invention provides a finisher, which is installed on the end portion of a tail pipe extending from a muffler of an internal combustion engine exhaust system, on an inner peripheral surface of the finisher and an outer peripheral surface of the end portion of the tail pipe. In the finisher mounting structure of the muffler, which is provided by forming an air passage between the tail pipe and the tail pipe, a holding portion is provided on the inner peripheral surface of the finisher to hold the finisher by contacting the opening portion of the tail pipe. A side portion of a mass damper formed in a substantially U shape is attached to the outer peripheral surface of the end portion of the pipe, and a portion connecting the side portions of the mass damper is separated from the outer peripheral surface of the tail pipe and protrudes outward. A mounting portion on the damper side and a mounting portion on the finisher side on the finisher, and the finisher exterior to the tail pipe is mounted on the holding portion. Provided by being held in the opening of the tail pipe, and the damper-side mounting portion of the mass damper and the finisher-side mounting portion of the finisher externally mounted on the tail pipe are tightened by a tightening mechanism to mount the finisher. Is characterized by.

[Action]

According to the structure of the present invention, the finisher externally mounted on the tail pipe is held by the holding portion in the opening portion of the tail pipe, and the damper side mounting portion of the mass damper provided by being laterally mounted on the outer peripheral surface of the tail pipe end portion. The finisher mounted on the tail pipe is attached to the finisher-side mounting portion of the finisher by the tightening mechanism, so that the finisher can be attached at two points, the tail pipe end and the opening. It is possible to eliminate the cause of the generation of abnormal noise such as mounting due to, and to use the mass damper as a mounting member. Further, the damper side mounting portion provided by separating the portion connecting the side portions of the mass damper attached to the tail pipe from the outer peripheral surface of the tail pipe and projecting them outward,
By being located in the air passage formed between the inner peripheral surface of the finisher and the outer peripheral surface of the end portion of the tail pipe, it is possible to provide an obstacle to foreign matter trying to enter the air passage. Further, coupled with the fact that the mass damper can be used as a mounting member, it is possible to eliminate the need for a separate component such as a conventional belt-type clamp mounting structure.

〔Example〕

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

1 to 4 show an embodiment of the present invention.
In the figure, 2 is a tail pipe and 4 is a finisher. The tubular finisher 4 which is installed on the end portion 6 of the tail pipe 2 extending from a muffler (not shown) of an internal combustion engine exhaust system (not shown) has an inner peripheral surface 8 of the finisher 4.
An air passage 12 is formed between the outer peripheral surface 10 of the tail pipe 2 and the tail pipe 2.

A vibration damping mass damper 14 is attached to the outer peripheral surface 10 of the tail pipe 2. A part of the mass damper 14 is separated from the outer peripheral surface 10 of the terminal end portion 6 of the tail pipe 2 and protrudes outward to provide a damper side mounting portion 16. That is, the mass damper 14 is provided with the side portions 18 and 18 attached to the outer peripheral surface 10 of the end portion 6 of the tail pipe 2 by welding or the like, and the portion connecting the side portions 18 and 18 is connected to the end portion 6 of the tail pipe 2. The damper-side mounting portion 16 is provided so as to be separated from the outer peripheral surface 10 and project outward, and is formed in a substantially U-shape. Further, a damper side insertion hole 20 is formed in the damper side mounting portion 16 and provided.

The finisher 4 is provided with a finisher-side mounting portion 22. A finisher-side insertion hole 24 is formed in the finisher-side mounting portion 22.

The damper side mounting portion 16 and the finisher side mounting portion 22
And are tightened by the tightening mechanism 26. The tightening mechanism 26
It is composed of a tightening nut 28 and a tightening bolt 30, and is tightened by screwing a male screw part 34 of the tightening bolt 30 into a female screw part 32 of the tightening nut 28.

In the tightening nut 28, the female screw portion 32 is inserted into the damper side through hole 20.
The damper side mounting portion 16 is fixedly attached to the outer peripheral surface 10 side of the tail pipe 2. In addition, tightening bolt 30
From the finisher-side insertion hole 24 of the finisher-side mounting portion 22 to the tamper-side insertion hole 20 of the damper-side mounting portion 16.
Then, the finisher 4 is attached by screwing it into the female screw portion 32 of the tightening nut 28 and tightening. In addition,
Reference numeral 36 is a holding unit. The holding portion 36 is the finisher 4
Is held in the opening 38 of the tail pipe 2.

 Next, the mounting will be described.

When installing the finisher 4, the tail pipe 2
The side portions 18, 18 of the mass damper 14 are attached to the outer peripheral surface 10 of the terminal end portion 6 by welding or the like. Cylindrical finisher 4
Is mounted on the outer peripheral surface 10 of the terminal portion 6 of the tail pipe 2, and the finisher 4 is attached to the opening portion of the tail pipe 2 by the holding portion 36.
Hold at 38. At this time, the finisher 4 is mounted so that the damper-side insertion hole 20 of the damper-side mounting portion 16 is aligned with the finisher-side insertion hole 24 of the finisher-side mounting portion 22.

The male screw portion 32 of the tightening bolt 30 of the tightening mechanism 26 is inserted into the finisher-side insertion hole 24 of the finisher-side mounting portion 22 of the finisher 4 which is mounted on the tail pipe 2. The male screw portion 32 of the tightening bolt 30 is inserted from the finisher-side insertion hole 24 through the damper-side insertion hole 20 of the damper-side mounting portion 16 so as to be aligned with the damper-side insertion hole 20.
16 is attached to the outer peripheral surface 10 side of the tail pipe 2 and is tightened by being screwed onto the female screw portion 32 of the tightening nut 28 provided.

As a result, in the finisher 4 which is externally mounted on the tail pipe 2, the finisher-side mounting portion 22 is fastened to the damper-side mounting portion 16 by the fastening mechanism 26, and the inner peripheral surface 8 of the finisher 4 and the outer peripheral surface 10 of the tail pipe 2 are joined together. And an air passage 12 is formed between them.

In this way, the finisher 4 which is mounted on the tail pipe 2 is held by the holding portion 36 in the opening 38 of the tail pipe 2, and the mass damper 14 is attached to the outer peripheral surface 10 of the tail pipe 2 at the damper side. By providing the portion 16 and the finisher-side mounting portion 22 of the finisher 4 by tightening with the tightening mechanism 26 to mount the finisher 4, the finisher 4 can be mounted at the end portion 6 of the tail pipe 2 and the opening portion 38. It is possible to mount, it is possible to eliminate the cause of generation of abnormal noise such as the conventional mounting due to pressing, and it is possible to prevent generation of abnormal noise due to loose mounting.

In addition, the portion of the mass damper 14 that connects the side portions 18, 18 attached to the tail pipe 2 is defined by the outer peripheral surface 10 of the tail pipe 2.
The damper-side mounting portion 16 provided so as to be spaced apart from and to project outward is located in the air passage 12 formed between the inner peripheral surface 8 of the finisher 4 and the outer peripheral surface 10 of the terminal end portion 6 of the tail pipe 2. By doing so, it is possible to prevent foreign matter that is trying to enter the air passage 12 from becoming an obstacle, so that it is possible to prevent foreign matter 40 such as pebbles from entering the air passage 12.

Further, coupled with the fact that the mass damper 14 can be used as a mounting member, it is possible to eliminate the need for a separate part such as a conventional belt-type clamp-based mounting structure, so that the cost can be reduced. .

In this embodiment, the outer peripheral surface 10 of the tail pipe 2 of the damper-side mounting portion 16 is aligned with the damper-side insertion hole 20.
Although the tightening nut 28 was fixedly provided on the side, the damper side insertion hole
The female screw portion 32 may be provided directly on the 20.

[Effect of device]

As described above, according to this invention, the finisher is held in the opening of the tail pipe by the holding portion, and the damper-side mounting portion and the finisher-side mounting portion are tightened by the tightening mechanism to attach the finisher to the mass damper. The finisher can be attached at two positions, the tail pipe end portion and the opening portion, and the cause of the abnormal noise such as the conventional pressing attachment can be eliminated, and the mass damper is used as the attaching member. be able to. For this reason, it is possible to prevent the generation of the abnormal noise such as the conventional mounting due to the pressing, so that the abnormal noise due to the loose mounting can be prevented.

Further, since the damper-side mounting portion of the mass damper can serve as an obstacle to foreign matter that is trying to enter the air passage, it is possible to prevent foreign matter from entering the air passage.

Further, in combination with the fact that the mass damper can be used as a mounting member, the cost can be reduced by eliminating the need for a separate part such as a conventional belt-type clamp mounting structure.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a partial sectional side view of a finisher mounting structure, and FIG. 2 is II of FIG.
-II line sectional view, FIG. 3 is a rear view shown by the arrow III in FIG. 1,
FIG. 4 is an enlarged cross-sectional view of a portion indicated by an arrow IV in FIG. 5 and 6 show a conventional example, FIG. 5 is a partial cross-sectional side view of the finisher mounting structure, and FIG. 6 is a rear view of another finisher mounting structure. In the figure, 2 is a tail pipe, 4 is a finisher, and 6
Is an end portion, 8 is an inner peripheral surface, 10 is an outer peripheral surface, 12 is an air passage, 14
Is a mass damper, 16 is a damper side mounting portion, 18 is a side portion, 20 is a damper side insertion hole, 22 is a finisher side mounting portion, 24 is a finisher side insertion hole, 26 is a tightening mechanism, 28 is a tightening nut, and 30 is Tightening bolts, 32 is a female screw portion, 34 is a male screw portion, 36 is a holding portion, and 38 is an opening portion.

Claims (1)

(57) [Scope of utility model registration request] 1. A finisher, which is installed on the end portion of a tail pipe extending from a muffler of an exhaust system of an internal combustion engine, has an air passage formed between an inner peripheral surface of the finisher and an outer peripheral surface of the tail pipe. In the finisher mounting structure of the muffler provided by mounting, a holding portion for holding the finisher by contacting the opening of the tail pipe is provided on the inner peripheral surface of the finisher, and a substantially U-shaped outer peripheral surface of the end portion of the tail pipe. A side portion of the mass damper formed in a V shape is attached and provided, and a portion connecting the side portion of the mass damper is separated from the outer peripheral surface of the tail pipe and protruded outward to provide a damper side attaching portion and the finisher. A finisher-side mounting portion is provided on the tail pipe, and the finisher exterior to the tail pipe is held in the opening portion of the tail pipe by the holding portion. A muffler finisher mounting structure, characterized in that the damper side mounting part of the mass damper and the finisher side mounting part of the finisher exterior to the tail pipe are tightened by a tightening mechanism to mount the finisher. .