JP2594341Y2 - Exhaust pipe connection structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a structure of a connection portion of an exhaust pipe of a vehicle.

[0002]

2. Description of the Related Art As shown in FIGS. 4 to 7, a conventional structure is such that an engine-side pipe is inserted into a muffler-side pipe and a portion where the muffler-side pipe and the engine-side pipe overlap is fastened with a clamp a to prevent the pipe from coming off. Or FIG.
As shown in FIG. 9, a flange b was provided at the end of the pipe, and the pipe was fastened via a gasket. In the figure, a indicates a clamp, b indicates a flange, c indicates a bolt, d indicates a gasket, and e indicates a slit.

[0003]

In the conventional structure shown in FIGS. 4 and 5, the gap h between the engine-side pipe and the muffler-side pipe is provided.
Exhaust gas leaks from the connection part through the slit e. However, there is a limit in reducing the gap h and the slit e due to the assemblability and the like, and it is not possible to eliminate exhaust leakage. Although the structure shown in FIGS. 6 and 7 is effective for leakage of the exhaust gas from the slit e, the gasket d is adhered to the inside of the clamp a. There is a problem that the function is lost and the gasket d comes off due to exhaust pressure or engine vibration. Further, the structures shown in FIGS. 8 and 9 have excellent sealing properties, but if the squareness of the flange b with respect to the pipe is not accurately finished, there is a problem that the position of the muffler is largely displaced, resulting in an increase in cost in terms of structure. .

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and in an exhaust pipe connection portion of an industrial vehicle, one end of the exhaust pipe is tapered and the other exhaust pipe is connected to the exhaust pipe. The bulge is provided from the end part to the middle part, and the tip is formed in the reverse taper structure. And the connecting portion can be sealed with the tapered portion without using a gasket.

[0005]

As described above, since the two pipes are sealed by matching their tapered surfaces, no gasket is required, so that the structure is simple and the assembling property is good. Therefore, leakage of the exhaust gas from the connection portion of the exhaust pipe can be eliminated, processing accuracy is not required, and the cost can be relatively reduced.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a cross-sectional view showing a connection structure, FIG. 2 is a perspective view of a clamp 1, and FIG. 3 is an entire connection portion between a muffler-side pipe 3 and an engine-side pipe 4. In FIG. 1, the end of the engine-side pipe 4 is widened to a taper angle θ1 in a tapered shape, and the muffler-side pipe 3 on the other side is provided with a bulge 3a at the same angle as the engine-side pipe 4 from the tip. The muffler-side pipe 3 is provided with a bulge 3a from an end face to a certain position, and then an inverse taper is formed at an angle θ2 to a straight portion of the pipe.

Here, if the taper angles θ1 and θ2 are made equal, the direction of the clamp 1 need not be considered. Note that there is no problem even if the shapes of the engine side pipe 4 and the muffler side pipe 3 are reversed. The cross-sectional shape of the clamp 1 is a shape that matches the taper of the pipe connection.

[0008]

[Effect of the Invention] The invention is made as described above,
Since the pipes are sealed by matching their tapered surfaces, the structure is simple, the workability and assemblability of the pipes are good, and the pipes can be made relatively inexpensive. Since a gasket is not required, the number of parts is reduced, and the problem of looseness of the mating portion due to settling and deterioration of the gasket can be eliminated. As described above, according to the present invention, since the exhaust gas is not leaked from the connection portion of the exhaust pipe and the processing accuracy is not required, the assembling work can be efficiently performed.

[Brief description of the drawings]

FIG. 1 shows a cross-sectional view of an embodiment according to the present invention.

FIG. 2 shows a perspective view of the clamp alone according to the present invention.

FIG. 3 shows an example of a connecting portion between a muffler side pipe and an engine side pipe.

FIG. 4 shows a structure of a connecting portion using a conventional clamp.

5 shows a cross-sectional view of the connection of FIG.

FIG. 6 is a structural view of a connection part using a conventional clamp and a gasket.

7 shows a cross-sectional view of the connection of FIG.

FIG. 8 shows a structural diagram of a connection portion using a conventional flange and gasket.

FIG. 9 shows the shape of the flange of the structure of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Clamp 2 Clamp bolt 3 Muffler side pipe 3a Swelling 4 Engine side pipe

Claims (1)

(57) [Scope of request for utility model registration] In an exhaust pipe connecting portion of an industrial vehicle, one end of an exhaust pipe is expanded in a tapered shape, and the other exhaust pipe is tapered in accordance with the end, and a bulge is provided from the end to the middle.
Ahead is reversed tapered structure, these two exhaust pipes tailored to the taper angle is brought into contact in accordance with the taper angle clamp and the clamp bolt, tighten the connection portion, using a gasket
A connection portion structure for an exhaust pipe, wherein a connection portion can be sealed with a tapered portion without using the connection portion.