JPH09189389A - Exhaust pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the manufacture and improve the durability by providing an inner pipe formed by slidably stacking the inner pipe and an outer pipe of an exhaust pipe via sealing materials and the outer pipe formed by spirally arranging a plurality of flat springs at fixed intervals. SOLUTION: An inner pipe A1 and an outer pipe B2 are slidably stacked on each other via sealing materials 3, 4 so as to be formed into an exhaust inner pipe. The sealing materials 3, 4 are provided in adjacent to respective ends of the inner pipe A1 and the outer pipe B2 so as to improve sealing performance. The outer cylinder 5 is so formed that a plurality of flat springs 7 are arranged on holding pieces 6a, 6b for holding the flat springs in the upstream and downstream sides at fixed intervals so as to fixedly stuck by a spot welding or a normal welding and the holding pieces 6a, 6b are formed into ring shapes by roll forming so as to be held by the outer circumference of the inner pipe A1 and the outer pipe B2. Then, the flat springs 7 are spirally arranged at the fixed intervals. The adoption of the flat springs 7 can thus eliminate stepping-stones, etc., from directly hitting on the internal pipe so that the firm pipe can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust pipe joint for connecting exhaust pipes of automobiles and the like.

[0002]

2. Description of the Related Art Among exhaust pipe joints, those used in a portion where it is necessary to absorb vibration are generally covered with a braid formed by braiding fine metal wires on the outer periphery of a bellows. Both ends are integrally fixed to both ends of the bellows with ring-shaped covers.

[0003]

The conventional structure as described above has a drawback that exhaust gas flows in a pipe having continuous undulations, so that a turbulent flow is generated, which causes noise and exhaust resistance. . In addition, the strength of the blade is insufficient when it comes into contact with flying stones, projections, etc., and the blade is not easily manufactured, and the cost is high. Therefore, the present invention is intended to facilitate manufacture of a flexible exhaust pipe joint of a type that absorbs vibration of an exhaust pipe, reduce costs, and improve durability.

[0004]

The present invention is directed to an exhaust pipe inner pipe A
The exhaust pipe joint is composed of an inner pipe in which the outer pipe B and the outer pipe B are slidably superposed via a sealant, and an outer cylinder in which a plurality of plate springs are spirally arranged at regular intervals.

Also, the exhaust pipe joint is composed of a flexible inner pipe of the type that absorbs the vibration of the exhaust pipe and an outer cylinder in which a plurality of plate springs are spirally arranged at regular intervals.

[0006]

1 is a sectional view of a first embodiment, FIG.
FIG. 3 is a perspective view of an exhaust pipe inner pipe A and an outer pipe B. 3A and 3B show a manufacturing process of the outer cylinder. FIG. 3A is a plan view before forming the outer cylinder, and FIG. 3B is a perspective view of the completed outer cylinder.

As shown in these figures, the inner pipe A1 and the outer pipe B2 are slidably superposed via the seal members 3 and 4 to form an exhaust inner pipe. The sealing materials 3 and 4 are provided near the respective ends of the inner pipe A1 and the outer pipe B2 to enhance the sealing performance.

In the outer cylinder 5, a plurality of plate-shaped springs 7 are arranged at fixed intervals as shown in (a) on holding pieces 6a, 6b for holding the plate-shaped springs on the upstream side and the downstream side. Fix by welding, and hold the holding pieces 6a, 6b as shown in (b) to the inner pipe A1 and the outer pipe B2.
It is formed into an annular shape by roll forming so as to be held on the outer periphery of the. At this time, the plate springs 7 are spirally arranged at regular intervals. By adopting a plate-shaped spring, it is a strong one that does not directly hit the inner pipe even if there are flying stones.

4 and 5 show a second embodiment of the present invention,
The exhaust pipe joint includes a flexible inner pipe 8 and an outer cylinder 5 in which a plurality of plate-shaped springs are spirally arranged at regular intervals. Since the flexible inner pipe 8 has a large number of relatively small corrugated beads in the circumferential direction to provide flexibility, the exhaust resistance is much smaller than that of a continuous pipe having large undulations. In this example, the plate spring 7 of the outer cylinder 5 is formed in a corrugated shape, but a flat spring similar to that in the above-described embodiment may be used.

[0010]

According to the present invention, the flexible exhaust pipe joint of the type that absorbs the vibration of the exhaust pipe can be easily manufactured, the cost can be reduced, and the durability can be improved without being damaged by flying stones. did. In addition, it is possible to prevent turbulence in the exhaust pipe and noise.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment.

FIG. 2 is a perspective view of an inner pipe A and an outer pipe B of an exhaust pipe.

FIG. 3A is a plan view showing a manufacturing process of an outer cylinder before being formed into a tubular shape, and FIG. 3B is a perspective view of the completed outer cylinder.

FIG. 4 is a sectional view of a second embodiment.

FIG. 5 is a perspective view of an outer cylinder of a second embodiment.

[Explanation of symbols]

 1 Inner Tube A 2 Outer Tube B 3 Sealing Material 4 Sealing Material 5 Outer Cylinder 6 Holding Piece 7 Plate Spring 8 Flexible Inner Tube

Claims (2)

[Claims] 1. An exhaust pipe comprising an inner pipe in which an exhaust pipe inner pipe A and an outer pipe B are slidably overlapped with each other via a sealing material, and an outer pipe in which a plurality of plate springs are spirally arranged at regular intervals. Fittings. 2. An exhaust pipe joint comprising a flexible inner pipe and an outer cylinder in which a plurality of plate springs are spirally arranged at regular intervals.