JPH025056Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to exhaust pipe devices for motorcycles and other small vehicles, and includes an exhaust pipe led from the engine and a muffler that opens to the atmosphere in small vehicles such as motorcycles. This invention relates to an improvement of a sealing member interposed between the

[Prior art] A sealing member filled with asbestos or other elastic heat-resistant material is interposed between an outer cylinder and an inner cylinder between an exhaust pipe connected to an engine and a muffler that opens to the atmosphere. There are some that are stacked together and tightened and fixed at this overlapped part.

The sealing member used for the connection between the exhaust pipe and the muffler is required to have heat resistance and long-term durability. It is known to cover the seal member with a sealing material, fit it around the outer periphery of an exhaust pipe or a muffler, and tighten it with a band (for example, see Utility Model Application No. 53-48907 and Utility Model Application No. 58-98417). ).

[Problem to be solved by the invention] However, with this type of sealing member, if the band is insufficiently tightened, the sealing is likely to be incomplete, and conversely, if it is too strong, the sealing member will be damaged and will not be used once. If the muffler is disassembled, it cannot be used again, so it is less easy to assemble and maintain.

Additionally, the seal member is inserted between the exhaust pipe leading to the engine and the muffler that opens to the atmosphere, so if there are variations in the dimensional accuracy of the product, it will be difficult to insert it smoothly and work efficiency will be reduced. descend.

Furthermore, if the sealing member is filled with asbestos, heat-resistant rubber, or other heat-resistant material between the outer cylinder and the inner cylinder, exhaust gas may be discharged from the gap between the overlapped portion of the outer cylinder and the inner cylinder that cover the heat-resistant material. may flow in, reducing the durability of the heat-resistant material.

This invention was devised in view of the above points, and the purpose is to provide an exhaust pipe device for a motorcycle, etc., which improves assembly, maintainability, workability, and durability.

[Means for Solving the Problem] In order to solve the above problem, this invention uses asbestos or other elastic material between the outer cylinder and the inner cylinder between the exhaust pipe connected to the engine and the muffler that opens to the atmosphere. In an exhaust pipe device for a motorcycle, etc., in which the outer cylinder and the inner cylinder are overlapped with a sealing member filled with a heat-resistant material interposed therebetween, and the overlapped part is tightened and fixed, the outer cylinder and the inner cylinder are placed on both ends in a mold. The end of the outer cylinder is folded back to the inner cylinder side and overlaps on the inner cylinder side, and the end of the outer cylinder forms the same inner surface as the inner cylinder, and the outer cylinder and the inner cylinder are pushed outward. It is characterized by integrally forming a protruding annular projection.

[Function] This invention compresses the outer cylinder and the inner cylinder from both ends in the mold, and integrally forms the seal member filled with heat-resistant material, so that the seal member can be easily molded.

In addition, this sealing member is an annular protrusion formed on the outer cylinder and the inner cylinder, and the surface pressure at the part where the exhaust pipe and the muffler come into contact is high, ensuring complete sealing.
This prevents damage to the seal member due to tightening, improving assembly and maintainability.

Furthermore, the sealing member is compressed with a mold to form the same inner surface at the end of the outer cylinder as the inner cylinder, improving the dimensional accuracy of the inner diameter and allowing the outer cylinder and inner cylinder to protrude outward. Because it forms an annular protrusion, it can be smoothly inserted into an exhaust pipe or muffler, improving work efficiency.

Further, since there is no gap between the overlapped portions of the outer cylinder and the inner cylinder, and this portion is reliably sealed, it is possible to prevent exhaust gas from flowing in from the overlapped portions and impairing the durability of the heat-resistant material.

[Example] This invention will be explained below with reference to the illustrated example.

In the figure, reference numeral 1 is an exhaust pipe led from an engine (not shown), and 2 is a muffler. The end of the muffler 2 has a large-diameter portion 2a that is enlarged and has a large diameter. Fixed.

The sealing member 3 is composed of an outer cylinder 5, an inner cylinder 6, and a filler 7 made of a heat-resistant elastic material such as rubber or asbestos filled between them. The outer cylinder 5 and the inner cylinder 6 are compressed from both ends in a mold to form the outer cylinder 5.
The end 5a of the inner cylinder 6 is folded back toward the inner cylinder 6.
overlap at the end 6a of the outer cylinder 5, and the inner cylinder 6 overlaps at the end 5a of the outer cylinder 5.
Annular protrusions 8a and 8b, which form the same inner surface as the outer cylinder 5 and the inner cylinder 6 and project outward, are integrally formed with the outer cylinder 5 and the inner cylinder 6, respectively.

In this way, the sealing member 3 is integrally molded such that the outer tube 5 and the inner tube 6 are compressed from both ends in the mold to cover the filler material 7. Therefore, the end 5a of the outer cylinder 5 is folded back toward the inner cylinder 6, and the end 6a of the inner cylinder 6 is overlapped with the end 5a to securely seal the filling material 6.
Then, the outer cylinder 5 and the inner cylinder 6 that cover the filler 7 are integrated. Furthermore, the end portion 5a of the outer tube 5 forms the same inner surface as the inner tube 6, and is flush with the inner surface, improving the dimensional accuracy of the inner diameter.

Next, the assembly of this seal member 3 will be explained.
First, the sealing member 3 is manually pushed into either the exhaust pipe 1 or the large diameter part 2a, and then the other is fitted and overlapped, and then the band 4 is hung on the outer surface of the large diameter part 2a, and the overlapped part is closed. Tighten and secure to create a sanderch structure.

When this sealing member 3 is pushed in, the end 5a of the outer cylinder 5 of the sealing member 3 forms the same inner surface as the inner cylinder 6 and is flush with it, increasing the dimensional accuracy of the inner diameter, so that the sealing member 3 can be inserted smoothly.

Then, as band 4 was tightened, first of all,
An annular projection 8b formed on the inner cylinder 6 of the seal member 3
is in contact with the exhaust pipe 1, and the annular protrusion 8a formed on the outer cylinder 5 is in contact with the large diameter portion 2a of the muffler 2, but since these contact surfaces are small, a large surface pressure acts, strongly tightening the band 4 itself. A sufficient seal can be obtained without any problems. Therefore, the outer cylinder 5 and the inner cylinder 6 are less likely to be damaged and can be used for a long period of time. Also,
Even if the exhaust pipe is removed for maintenance, the seal member 3 can be used again.

Furthermore, the outer cylinder 5 and the inner cylinder 6 of the seal member 3 are
Since there is no gap between the overlapping parts of the ends 5a and 6a, and this part is reliably sealed, it is possible to prevent exhaust gas from flowing in from the overlapping parts and impairing the durability of the filler 7. It can be used for a wide range of purposes.

In addition, in the above embodiment, the inner cylinder 6 of the seal member 3
An annular protrusion 8b formed on the exhaust pipe 1 contacts the exhaust pipe 1, and an annular protrusion 8a formed on the outer cylinder 5 contacts the large diameter portion 2a of the muffler 2. The outer cylinder 5 of the sealing member 3 is
It is also possible to overlap the exhaust pipe 1 and the inner cylinder 6 in contact with the muffler 2 to form a sandwich structure.

[Effects of the invention] As mentioned above, this invention compresses the outer cylinder and the inner cylinder from both ends in the mold, and integrally forms the sealing member filled with heat-resistant material, so it can be easily and reliably compressed. The outer cylinder, inner cylinder, and heat-resistant material can be integrated.

In addition, since annular protrusions are formed on the outer and inner cylinders of the sealing member, the annular protrusions increase the surface pressure at the part where the exhaust pipe and the muffler come into contact, ensuring complete sealing and tightening. This prevents damage to the seal member and improves assembly and maintainability.

In addition, in the sealing member, the end of the outer cylinder is folded back to the inner cylinder side and overlaps on the inner cylinder side, and the end of the outer cylinder forms the same inner surface as the inner cylinder, improving the dimensional accuracy of the inner diameter. It can be inserted smoothly into exhaust pipes and mufflers, improving work efficiency.

Furthermore, since the sealing member is molded into an overlapped part between the outer cylinder and the inner cylinder, there is no gap in this overlapped part and the seal is securely sealed, allowing exhaust gas to flow in through the overlapped part and increasing the durability of the heat-resistant material. can be prevented from being damaged.

[Brief explanation of the drawing]

The drawing shows an example of this invention.
FIG. 1 is a partially cutaway sectional view of an engine exhaust pipe, FIG. 2 is an enlarged end view of a sealing member, and FIG. 3 is an enlarged sectional view of a main part thereof. Reference numerals in the figure 1... Exhaust pipe, 2... Silencer, 2a...
...Large diameter portion, 3...Sealing member, 5...Outer cylinder, 5a
. . . end, 6 . . . inner cylinder, 6 a .

Claims (1)

[Scope of utility model registration request] A sealing member filled with asbestos or other elastic heat-resistant material is interposed between the outer cylinder and the inner cylinder between the exhaust pipe connected to the engine and the muffler that opens to the atmosphere. In an exhaust pipe device for a motorcycle or the like that tightens and fixes overlapping parts, the sealing member compresses the outer cylinder and the inner cylinder from both ends in a mold so that the end of the outer cylinder is on the inner cylinder side. Motorcycles, etc., which are folded back and overlapped on the inner cylinder side, the outer cylinder has the same inner surface as the inner cylinder at the end, and annular protrusions projecting outward are integrally formed on the outer cylinder and the inner cylinder. Exhaust pipe device.