JPS6341533Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a connection structure for exhaust pipes constituting an exhaust system of an automobile, etc., in particular, a connection between a large diameter connection end B of one exhaust pipe A and a small diameter connection end of the other exhaust pipe C. D is inserted and the clamp is tightened at their overlapping portion E, and the resulting tightening force and the diameter reduction action of the large diameter connecting end B due to the appropriate number of slits formed in the large diameter connecting end B This invention relates to an improvement in a so-called plug-in exhaust pipe connection structure in which overlapping parts are joined.

FIGS. 1 and 2 show the conventional plug-in type exhaust pipe connection structure. In this device, when connecting exhaust pipe A and exhaust pipe C (see Fig. 3), the small diameter connecting end D of the exhaust pipe C is inserted into the large diameter connecting end B of the exhaust pipe A, and the A clamp a is tightened on the overlapping portion E. Therefore, the overlapping portions E are joined by the tightening force of the clamp a and the diameter reduction action of the large diameter connecting end B by the plurality of slits b formed in the large diameter connecting end B, and as a result, the exhaust gas is removed. Pipe A and exhaust pipe C are connected. The above bonding force is determined by the tightening force of the clamp a, the length of the overlapping portion E, the number of slits b, etc.

However, in the case of such a conventional structure, since the diameter of the large-diameter connecting end B is reduced by tightening the clamp a, there is a gap between the large-diameter connecting end B and other parts on the exhaust pipe A side. A step c is formed due to the diameter difference,
Since the inner end of the slit b is located in the stepped portion c, a gas leakage passage d is formed, which has the drawback of causing gas leakage and noise.

In addition, there is a technique such as Japanese Utility Model Application Laid-open No. 117689/1989 that connects the exhaust pipe by inserting the exhaust pipe.

Therefore, this invention provides an exhaust pipe connection structure that can deal with the above-mentioned problems.

An embodiment of this invention will be described below with reference to FIGS. 4 and 5.

The small diameter connecting end D of the exhaust pipe C is inserted into the large diameter connecting end B of the exhaust pipe A. Said large diameter connection end B
A plurality of slits 1 are formed at predetermined intervals. A cover body 2 is attached to such exhaust pipes A and C. The cover body 2 has a portion 3 covering the exhaust pipe A, a portion 4 covering the exhaust pipe C, and a portion 5 covering the overlapped portion E, and has a slit 6 communicating from one end to the other end.
is formed. Portion 3 covering the exhaust pipe A
is dimensioned so that it comes into close contact with the exhaust pipe A, and the portion 4 that covers the exhaust pipe C is dimensioned so that it comes into close contact with the exhaust pipe C. Further, the cover body 2 is fitted with the slit 6 shifted so as not to overlap the slit 1 of the large diameter connecting end B as shown. Then, the portion 5 covering the overlapping portion E of the cover body 2 and the portion 4 covering the exhaust pipe C are tightened with clamps 7 and 8.

With such a structure, the overlapping portion E is connected by tightening the clamp 7 and reducing the diameter of the cover body 2 and the large diameter connecting end B by the slits 1 and 6, so that the exhaust pipe A and Exhaust pipe C is connected.
In this case, the gas leak passage 10 formed in the stepped portion 9 of the exhaust pipe A is closed by the cover body 2, so that gas leakage and noise from this portion can be reduced.
Further, leakage of the exhaust gas G (in the direction of the arrow) toward the outside through the slit 6 is further reduced by the tightness of the portion 4 covering the exhaust pipe C, which is enhanced by the clamp 8. The clamp 8 also increases the connection force. Note that the portion 3 covering the exhaust pipe A may be tightened with a clamp. Further, the slit side portions 12 and 13 of the stepped portion 11 formed between the portion 5 covering the overlapping portion E of the cover body 2 and the portion 4 covering the exhaust pipe C are pressed inward to open the exhaust pipe C. There is also a method of further increasing the insulation of gas and noise from the outside by bringing it into pressure contact with the outer circumferential surface.

The above connection can be easily made as shown in FIG. That is, the large diameter connection end B of the exhaust pipe A
Insert the part 3 of the cover body 2 that covers the exhaust pipe A, and insert the small diameter connecting end D of the exhaust pipe C into the part 4 of the cover body 2 that covers the exhaust pipe C, and connect the exhaust pipe A and the exhaust pipe. Insert the small diameter connecting end D into the large diameter connecting end B while bringing C closer together. In this case, the insertion is performed until the inner end of the slit 1 and the tip of the small diameter connecting end D substantially coincide with each other. The positioning of the cover body 2 is performed by the stepped portion 9. After this, cover body 2
Tighten with clamps 7 and 8.

In summary, the exhaust pipe connection structure according to this invention inserts the small diameter connection end D of the other exhaust pipe C into the large diameter connection end B of one exhaust pipe A, and tightens the clamp at the overlapping part E. However, in the exhaust pipe connection structure, the overlapping portion E is joined by the tightening force caused by this and the diameter reduction action of the large diameter connection end B by an appropriate number of slits formed in the large diameter connection end B. The exhaust pipes A and C, in which the small-diameter connecting end D is inserted into the large-diameter connecting end B, have a part that covers each of them and a part that covers the overlapping part E, and one end A cover body having a slit that communicates with the other end is shifted and applied so that the slit does not overlap the slit of the large diameter connecting end B, and the overlapping portion E of the cover body is covered. Since the parts are clamped together, as described in the embodiment, the gas leak passage formed on the exhaust pipe A side can be closed by the cover body, thereby reducing gas leakage and noise. occurrence is reduced.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a conventional exhaust pipe connection structure;
Figure 2 is a sectional view of the same, Figure 3 is an exploded perspective view of the same, and Figure 4 is a cross-sectional view of the same.
5 is a sectional view of the same, FIG. 6 is a perspective view showing the connection procedure, and FIG. 7 is a perspective view of a different embodiment of the invention. In the figure, A and C are exhaust pipes, B is a large-diameter connecting end, D is a small-diameter connecting end, E is an overlapping part, 1 and 6 are slits, 2 is a cover body, and 3 is a part that covers exhaust pipe A. , 4 is a portion covering the exhaust pipe C, 5 is a portion covering the overlapping portion E, 7 is a clamp, 11 is a stepped portion, and 12 and 13 are slit side walls.

Claims (1)

[Scope of utility model registration request] Insert the small-diameter connecting end D of the other exhaust pipe C into the large-diameter connecting end B of one exhaust pipe A, and tighten the clamp at their overlapping part E, and the resulting tightening force and the large-diameter connecting end B This is an exhaust pipe connection structure in which the overlapping portion E is joined by the diameter reduction action of the large diameter connection end B by an appropriate number of slits formed in the large diameter connection end B, and the small diameter connection end is connected to the large diameter connection end B. The exhaust pipe A and the exhaust pipe C into which the part D is inserted have a part covering each and a part covering the overlapping part E,
In addition, a cover body forming a slit communicating from one end to the other end is fitted so that the slit does not overlap the slit of the large diameter connecting end B, and the overlapping portion E of the cover body is fitted. An exhaust pipe connection structure characterized by clamping the part that covers the exhaust pipe.