JPH0722019U - Flexible flange - Google Patents

Abstract

(57) [Summary] [Object] To prevent deformation of a spherical seat due to heat during welding in a pipe joint having a spherical seat and welded to a pipe constituting an exhaust system of an engine. [Structure] A spherical seat 3 is formed on the flange portion 1, and the spherical seat 3 is formed.
The bent ribs 5 are formed on the circumference of the boss portion 2 formed by extending. The deformation caused by the heat when the boss portion 2 is welded to another pipe is absorbed by the rib 5, and the spherical seat 3 can be prevented from being deformed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flexible flange used as a pipe joint in an exhaust system of an engine that drives an automobile or other vehicle.

[0002]

[Prior art]

 Since vibrations due to engine rotation act on the engine exhaust system, pipe joints with various structures have been adopted for the purpose of eliminating the effect of this vibration. As an example thereof, there is a technique disclosed in Japanese Utility Model Publication No. 2-10249.

According to the above technique, a flange having a spherical seat is welded to the tube end of one tube, and a spherical surface urged in a direction projecting from the tube end by a connecting flange and a spring member to the tube end of the other tube. -Shaped gaskets are attached, and the two flanges are fastened by bolts with a tightening spring interposed, so that noise due to vibration can be prevented.

[0004]

[Problems to be solved by the device]

 In the above technique, the flange having the spherical seat and the pipe are joined by welding the fitting portion of the boss and the pipe over the entire circumference. Further, the flange may be welded to the end of the case that houses the converter, and then additional manual welding may be performed on the case. For this reason, the spherical seat may be distorted due to heat during welding, which makes it difficult to guarantee spherical accuracy.

An object of the present invention is to provide a flexible flange capable of absorbing the strain caused by heat when performing welding and maintaining the spherical surface accuracy of the spherical seat.

[0006]

[Means for Solving the Problems]

 In order to solve the above problems, a flexible flange according to the present invention comprises a flange having a spherical seat that abuts a spherical gasket, and a rib extending from the spherical seat and bent on the circumference. And a boss.

[0007]

[Action]

 In the above-mentioned flexible flange, when the case for housing the pipe or the converter is fitted to the boss and welded, the strain due to heat can be absorbed by the rib. Therefore, the shape of the spherical seat does not change, and the spherical accuracy can be maintained.

[0008]

【Example】

 An embodiment of the flexible flange will be described below with reference to the drawings. FIG. 1 is a diagram illustrating the shape of the flexible flange, and FIG. 2 is a diagram illustrating a state in which another member is connected to the flexible flange.

In the figure, the flexible flange A is composed of a flange portion 1 and a boss portion 2. The flexible flange A is manufactured by subjecting a blank to plastic working such as drawing and pressing, and it is possible to guarantee the dimensional accuracy and shape accuracy of the product as a single unit within a certain range.

The flange portion 1 is formed with a spherical seat 3 that contacts a spherical gasket attached to a pipe end of another pipe (not shown), and a plurality of bolt holes 4 are formed at predetermined positions. Therefore, by inserting a bolt with a spring inserted into the bolt hole 4 and fastening it to a connecting flange fixed to another pipe, the vibration of the engine is absorbed by the spring and the exhaust gas leakage is prevented. Is possible.

The boss portion 2 is formed by extending the spherical seat 3 of the flange portion 1, and a rib 5 is formed at a position separated from an end portion 2a of the boss portion 2 by a predetermined distance. The rib 5 is formed in a protrusion shape in which the circumference of the boss portion 2 is swollen. The number of ribs 5 formed on the boss portion 2 is not particularly limited, and may be one line as shown in the drawing, or may be two or three lines.

The rib 5 is formed by buckling a part of the boss portion 2. When a force acts on the end portion 2a side of the boss portion 2 of the rib 5 or the flange portion 1 side, the rib 5 responds to this force. Has the function of preventing the deformation of other parts.

That is, as shown in FIG. 2, when the pipe portion 6a of the case 6 for accommodating the converter is fitted into the boss portion 2 and the pipe portion 6a and the end portion 2a are welded over the entire circumference, The heat is transferred to the ribs 5 to deform the ribs 5. Therefore, the spherical seat 3 is cut off from the end portion 2a of the boss portion 2 by the rib 5, and is not deformed due to the influence of welding.

Further, when vibration occurs due to the rotation of the engine, this vibration is absorbed by the spring interposed in the bolt that fastens the flange portion 1a. However, since the spherical seat 3 contacts the spherical gasket, the vibration is also transmitted to the spherical seat 3. This vibration is transmitted from the spherical seat 3 to the rib 5 via the boss portion 2. Then, the rib 5 is deformed and absorbed according to the transmitted vibration, and the transmission to the case 6 is prevented.

[0015]

[Effect of device]

 As described above in detail, in the flexible flange according to the present invention, the rib formed on the boss portion can absorb the deformation caused by the heat during welding, so that the spherical seat formed on the flange portion can be prevented from being deformed. . Therefore, it has a feature that the accuracy of the spherical shape in the spherical seat can be maintained.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a shape of a flexible flange.

FIG. 2 is a diagram illustrating a state in which another member is connected to the flexible flange.

[Explanation of symbols]

 A Flexible flange 1 Flange part 2 Boss part 3 Spherical seat 4 Bolt hole 5 Rib 6 Case

Claims (1)

[Scope of utility model registration request] 1. A flexible flange comprising: a flange having a spherical seat that abuts a spherical gasket; and a boss that extends from the spherical seat and has a rib that is bent and formed on the circumference. .