JPS6329141Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an exhaust system flexible tube.

An internal combustion engine vibrates during operation and transmits the vibrations to the exhaust pipe connected to it. As a result, the vehicle body vibrates through the exhaust pipe and the mounting that supports the muffler connected to the exhaust pipe on the vehicle body, causing noise inside the vehicle.

For this reason, a flexible tube is provided upstream of the exhaust pipe to suppress engine vibrations from being transmitted to the muffler and mounting, thereby reducing the noise inside the vehicle. (References: Utility Model No. 57-36312, Utility Model Application No. 57-
37178) FIG. 1 shows a conventional example of such an exhaust system flexible tube. In the figure, numerals 1 and 2 are short pipes that are connected to the exhaust inlet pipe and the exhaust outlet pipe by welding or the like, and the outer peripheries of these short pipes 1 and 2 are corrugated bellows pipes. 3 is welded, and the outer circumferential side of the bellows tube 3 is covered with a cylindrical braided wire 4, whose both ends are fixed to cylindrical mounting brackets 5 and 6 fixed to the short tubes 1 and 2. . 7 and 8 are retaining rings for holding down the braided wire cylindrical body.

Moreover, such an exhaust system flexible tube is assembled as follows. This assembly sequence will be explained with reference to FIG.

First, prepare a bellows pipe 3 as shown in Fig. 2a, and insert short pipes 1 and 2 on the inner periphery of both open ends of the bellows pipe 3 as shown in Fig. 2b.
They are integrated by welding as shown in the figure. On the other hand, there is a second
A cylindrical braided wire 4 as shown in Figure c is prepared, a mounting bracket 5 is inserted and welded to the inner periphery of one open end of the wire as shown in Figure 2d, and the braided wire 4 is welded as shown in Figure 2d. The retaining ring 7 is fitted onto the wire 4 and welded.

Next, the integrated mounting bracket 5 and braided wire 4 are coated onto the bellows pipe 3 from the short pipe 1 side, and then the mounting bracket 5 is welded to the short pipe 1, as shown in Fig. 2e. Do as shown. In addition, as shown in the figure, the other mounting bracket 6 is fitted to the inner periphery of the right open end of the braided wire 4, and this mounting bracket 6 is welded to the short pipe 2. A retaining ring 8 is fitted and welded onto the braided wire 4 at a portion opposite to the braided wire 6, thereby obtaining a flexible tube as shown in FIG. 2f. Further, an exhaust inlet pipe 9 and an exhaust outlet pipe 10 are welded to the short pipes 1 and 2 of this flexible tube.

However, such conventional exhaust system flexible tubes use short tubes 1 and 2 and weld at least 6 times, which requires a large number of parts and many man-hours for assembly. It was disadvantageous in terms of cost and cost.

This invention was made in order to solve such conventional drawbacks, and the purpose is to obtain a flexible exhaust system tube that is simple in structure and easy to assemble at a low cost. Therefore, this idea consists of an iron bellows tube, a cylindrical braided wire that covers the outer periphery of the bellows tube, and a half-split semi-cylindrical tube that is pressure-welded to the outer periphery of the braided wire at both ends of the covering. It comprises shaped brackets, a sealing material inlet provided in these brackets, and a bladed wire holding projection, and an exhaust inlet pipe and an exhaust outlet pipe are press-fitted into both open ends of the bellows pipe, The braided wire and the bracket are welded to each other, and the bracket is filled with a sealing material.

An embodiment of this invention will be described below with reference to FIG.

FIG. 3 is a sectional view of a part of the embodiment. 1
1 is an exhaust inlet pipe, 12 is an iron bellows pipe, 13
are braided wires, and these have substantially the same construction as those described above. 14 is a bracket made of two pieces of iron material. As shown in FIG. 5, this bracket 14 consists of two semi-cylindrical bodies 14a and 14b.
each of which has an exhaust inlet pipe 11
The neck portions 15a and 15b are press-fit welded to
6a, 16b, and protrusions 17a, 17b protruding from the inner periphery of the accommodating portions 16a, 16b over approximately half the circumference.
, sealant injection ports 18a and 18b, and welding ports 19a and 19b for welding work.
Further, 17c is a bladed wire restraining flange extending from the inner periphery of the ends of the accommodating portions 16a and 16b.

Although omitted in the figure, the assembly structure on the exhaust outlet pipe side is also exactly the same as above.

Next, the assembly order of the exhaust system flexible tube having such a configuration will be explained with reference to FIG. 4.

First, a bellows tube 12 as shown in FIG. 4a is prepared. This is the same iron bellows tube as shown in Figure 2a. Next, this bellows pipe 11
Using this as a core metal, braided wire 13 is knitted around the outer periphery of the wire as shown in FIG. 2b. Note that, if necessary, the braided wire 13 formed into a cylindrical shape may be press-fitted or slid into the bellows pipe 11.

Next, in order to securely attach the bracket to the wound body of the braided wire 13 and the bellows tube 11, both ends are cut straight and the ends are aligned as shown in FIG. 4c.

Next, each semi-cylindrical body 14a, 14b of the bracket 14 as shown in FIG. 5 is attached to both ends of the winding body.
Contact and apply pressure. Subsequently, while maintaining this pressurized state, the bracket 14 connects the braided wire 13 and the bellows at the gap P ₁ between the semi-cylindrical bodies 14a and 14b and at the welding ports 19a and 19b. The tubes 12 are welded together to form the configuration shown in Figure 4d.

Further, following this welding work, an exhaust inlet pipe 11 and an exhaust outlet pipe (not shown), each of which has its tip constricted to a small diameter, are press-fitted into the inner periphery of each open end of the bellows pipe 12, and the exhaust inlet pipe 11 , the exhaust outlet pipe and each bracket 14 are welded together at the neck portions 15a, 15b, and then the sealant injection port 18 is
A, 18b, the sealing material 20 is filled between the exhaust inlet pipe 11, the exhaust outlet pipe and each bracket 14 as shown in FIG. This sealing material 20 prevents exhaust gas from leaking out of the flexible tube. Note that the welding ports 19a and 19b may also be used as the sealing material injection ports 18a and 18b.

In the above manner, the semi-cylindrical bodies 14a and 14b are joined by ordinary welding, and the neck parts 15a and 15b are joined to the exhaust inlet pipe 11 and the exhaust outlet pipe by MIG earth welding, respectively. Therefore, the assembly work of the flexible tube becomes easier, and in addition to winding the braided wire 13 directly around the bellows tube, the efficiency of the assembly work is greatly improved. Furthermore, by reducing the number of parts used, the structure can be simplified and costs can be reduced.

As described in detail above, according to this invention, it is possible to reduce the number of component parts and the number of assembly work hours, thereby improving assembly work efficiency and lowering the cost of flexible tube products. It is something that can be done.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing a conventional exhaust system flexible tube, Fig. 2 a, b, c, d,
e and f are explanatory diagrams showing the assembly order, Fig. 3 is a partially cutaway front view showing the exhaust system flexible tube of this invention, and Fig. 4 a, b, c, d.
5 is an explanatory diagram showing the assembly order, and FIG. 5 is a perspective view of the bracket. 11...Exhaust inlet pipe, 12...Bellows pipe, 1
3... Braided wire, 14... Bracket, 17a, 17b... Protrusion for holding down the braided wire, 18a, 18b... Sealing material injection port, 19a, 19b... Welding port.

Claims (1)

[Scope of utility model registration request] A bellows tube made of iron, a cylindrical braided wire that covers the outer periphery of the bellows tube, a half-cylindrical bracket that is split into two halves that are pressure-welded to the outer periphery of both ends of the braided wire of this covering, and each of these brackets. It is equipped with a sealing material inlet provided in the and a protrusion for holding down the braided wire.
An exhaust system flexible tube, wherein an exhaust inlet pipe and an exhaust outlet pipe are respectively welded to both open ends of the bellows pipe, and each bracket is filled with a sealing material.