JPS61252822A - Pipe joint construction - Google Patents

Abstract

PURPOSE:To suppress the vibratory play of pipes fitted with each other at their joint, by interposing a buffer material between the outside circumferential surface of one of the pipes and the inside circumferential surface of the other at the joint. CONSTITUTION:The end 1a of a pipe 1 is inserted into that 2a of another pipe 2. A buffer material 4 is provided between the outside circumferential surface of the end 1a and the inside circumferential surface of the end 2a. An elastic ring 5 is provided between the buffer material 4 and a stopper ring 3 for the pipe 1. The vibration of the pipes 1, 2 is thus absorbed so that they are prevented from playing or coming off due to the vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to the structure of a joint portion of an exhaust pipe or the like of an internal combustion engine.

(Prior Art) In the case of a long and bent pipe such as an exhaust pipe, a plurality of pipes are jointed to form a single pipe.

The general structure of such a joint part is as shown in Fig. 7.
Insert the end (IQQa) of one metal pipe (100) into the end (Iota) of the other metal pipe (101), and connect the outer periphery of the end (100a) of the pipe (100) and the pipe (101). A cylindrical seal packing (102) is interposed between the inner periphery of the end (101a) of the other pipe (101a).
Metal band (103) on the outer periphery of the end (101a) of 01)
The metal band (103) is jointed by tightening it with a screw (100).

(Problems to be Solved by the Invention) In order to reliably prevent gas leakage from the joint part of the conventional structure described above, a pipe (10
0), (101) end diameter and seal packing (1
The thickness of G2) must be appropriate, and for this reason, the above member must be manufactured with excellent dimensional accuracy.

In addition, in the past, after fitting two pipes together,
It is necessary to wind the metal band (103), which increases the number of man-hours, and the metal band (103) has a flange portion, which protrudes radially outward after installation.

Furthermore, there is also the problem that vibrations cannot be effectively absorbed simply by interposing the seal packing (102).

(Means for Solving the Problems) In order to solve the above problems, the present invention provides two
A cushioning material to effectively absorb vibrations and an elastic ring to prevent gas leakage are interposed between the ends of the wooden pipe, and the elasticity of the cushioning material ensures that the pipe does not come off. I made it.

(Example) Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing the structure of the joint part according to the present invention, in which pipes (1) and (2) are jointed to each other.
have approximately the same diameter, a stopper ring (3) is provided on the outer periphery near the end (1a) of one pipe (1), and the end (2a) of the other pipe (2) has a large diameter. There is.

The end (1a) of one pipe (1) is inserted into the end (2a) of the other pipe (2), and the pipe (1) is inserted into the end (2a) of the other pipe (2).
End (la) outer periphery of 1) and end (2a) of pipe (2)
A cushioning material (4) is interposed between the inner circumferences, and an elastic ring (5) is fitted between the stopper ring (3) and the cushioning material (0). The tips of (2) are brought into pressure contact.

Here, the cushioning material (0 is a pipe (1),
(2) to absorb the vibrations of the pipe (1).

(2) A material that exhibits a resilient force that will not come off when fitted together, specifically, a material made by crushing and gathering thin wires into a roughly tubular shape. In addition, the elastic ring (5
) is a rubber ring that can provide a gas seal.

Also, the pipes (1) and (2) may be made of metal, but
In this embodiment, a molded sound absorbing material is used as the material.

A method of forming a pipe using this molded sound absorbing material will be explained based on FIGS. 2 to 5.

First, inorganic or organic fibers such as long glass fibers or ceramic fibers are cut into appropriate lengths and mixed, and then subjected to roller pressure and needling to obtain mat-like fibers. Then, as shown in Figure 2, a heat-resistant inorganic molding agent (7) is applied to a part of the mat fiber (8), that is, the part that will become the inner peripheral surface of the pipe when it is molded, and then the outer peripheral surface An elastic molding agent (8) such as rubber is applied to the portion where the shape is to be formed. Then, the mat fiber (8) is wound around the core wire (9) to form the state shown in FIG. Fired while holding, then press molds (10), (11)
Take out the fired product from the core wire (9) as shown in Figure 5.
By pulling out the pipes (1) and (2), the middle part is made of molded sound absorbing material with excellent heat insulation, vibration absorption, and rigidity, the inner part has excellent heat resistance, and the outer part has flexibility.
is obtained. In this embodiment, mat-like fibers are formed by chopping fibers, but woven fabric may also be used.

FIG. 6 is a sectional view showing another embodiment. In this embodiment, an elastic ring (15) whose negative surface is a spherical surface (5a)
The tip of another pipe (2) is made to abut against the spherical surface (5a). With this configuration, the vibration absorbing properties of the pipes (1) and (2) against vibrations in the radial direction are improved.

(Effects of the Invention) As is clear from the above description, according to the present invention, in a joint formed by inserting and fitting the ends of two pipes, there is a gap between the outer periphery of one pipe and the inner periphery of the other pipe. Since the cushioning material is interposed in the pipe, it is possible to absorb the vibration of the pipe, suppress rattling caused by vibration, and prevent the pipe from coming off due to vibration.

Further, since an elastic seal ring is interposed between the pipes, gas leakage can be effectively prevented.

Furthermore, if the pipe is made of a molded sound-absorbing material, it can be made into a pipe with excellent vibration-absorbing and heat-insulating properties.Moreover, the inner surface of the pipe is coated with a heat-resistant inorganic molding agent, and the outer surface is made of elastic molding such as rubber. If the agent is applied, it will have many effects such as having excellent characteristics as an exhaust pipe.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the joint structure according to the present invention, and FIG.
5 to 5 are diagrams showing a pipe forming process, FIG. 6 is a sectional view of a geoind part structure according to another embodiment, and FIG. 7 is a sectional view showing a conventional joint part structure. In the drawings, (1) is one pipe, (2) is the other pipe, (la) and (2a) are the ends of the pipe, (3) is the stopper ring, (4) is the cushioning material, and (5) is the end of the pipe. is an elastic ring. Patent applicant: Agent for Honda Motor Co., Ltd.
Patent Attorney Part 2 1) Part 1 Patent Attorney
Kuni Ohashi, Patent Attorney, Department
Yama Udo Patent Attorney No 1) Shigeru Figure 1

Claims (2)

[Claims] (1) In a pipe joint structure in which the end of one pipe is inserted into the end of the other pipe, a stopper ring is provided on the outer periphery of the one pipe,
Further, a cushioning material is provided between the outer circumference of the end of the one pipe and the inner circumference of the end of the other pipe. A pipe joint structure characterized in that an elastic ring is interposed between the cushioning material and the stopper ring, with which the tip of the other pipe comes into contact. (2) The pipe joint structure according to claim 1, wherein the pipe is made of a molded sound-absorbing material.