JPH0138255Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an exhaust pipe connection structure for an engine mounted on a vehicle.

(Prior Art) Conventionally, as an exhaust pipe connection structure for such an engine, a sealing having a spherical sliding surface on one exhaust pipe has been used as a vibration countermeasure, for example, as disclosed in Japanese Utility Model Application Publication No. 148015/1983. In addition to fixing the ring, a flared portion having a sliding surface that contacts the spherical sliding surface of the sealing ring is integrally formed on the other exhaust pipe, and the connecting flanges fixed to both exhaust pipes are moved in a direction approaching each other. It is known that a spring is provided that biases the exhaust pipes to slidably connect the two exhaust pipes.

However, in the conventional method described above, the connecting flange was fixed to the exhaust pipe by welding, so there was a risk that cracks would occur in the exhaust pipe due to thermal stress generated during welding. On the formed exhaust pipe side, there was a problem in that the slidable surface of the flared portion was thermally deformed and the function of exhibiting free sliding properties was impaired.

(Purpose of the invention) In view of the above, the purpose of the invention is to fix the connecting flange without the need for welding, especially for exhaust pipes in which the flare part is integrally formed. The purpose is to eliminate thermal deformation of the sliding surface to fully exhibit slidability, and to prevent cracks in the exhaust pipe as much as possible.

(Structure of the invention) In order to achieve the above object, the structure of the invention is such that a sealing ring having a spherical sliding surface is fixed to one exhaust pipe as described above, and a spherical sliding surface of the sealing ring is fixed to the other exhaust pipe. A flared portion having a sliding surface that comes into contact with the surface is integrally formed, and a spring is provided that biases the connection flanges fixed to each of the exhaust pipes in a direction toward each other, so that the both exhaust pipes can freely slide. In the exhaust pipe connection structure of the connected engine, an uneven fitting part is formed on the exhaust pipe integrally formed with the flare part and the connection flange fixed to the exhaust pipe, so that the two are fitted and fixed. This is what I did.

(Effect of the invention) Therefore, according to the invention, for an exhaust pipe with an integrally molded flare part, the connecting flange can be reliably connected by fitting and fixing the fitting parts to each other without requiring welding. Since it can be fixed, it is possible to eliminate thermal deformation due to welding of the sliding surface of the flare part, improving the sliding function, and also preventing cracks from occurring due to thermal stress on the exhaust pipe side. can also be prevented.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

1 and 2, 1 and 2 are exhaust pipes, and one end of the exhaust pipe 1 has the following:
A flange 3 protruding in the outer circumferential direction is integrally formed by press working, and a connecting flange 4 is in contact with the inside of the flange 3, and a spherical sliding surface 5a is provided on the outer periphery at an outside position of the flange 3. A sealing ring 5 is fitted and fixed on the outside of each ring. Further, the sealing ring 5 is attached to one end of the other exhaust pipe 2.
A flared portion 6 having a sliding surface 6a that comes into contact with the spherical sliding surface 5a is integrally formed, and
A connecting flange 7 is externally fitted and fixed on the outer peripheral side of the flared portion 6.

Reference numerals 8 and 8 denote connecting members having threaded portions 8a and 8b at both ends, and each of the connecting members 8 has one end (one threaded portion 8a) at a symmetrical position across the exhaust pipes 1 and 2. The flare part 6 is fixed to the connecting flange 7 on the exhaust pipe 2 side, which is integrally formed, by screwing with a nut 9, while the other end is fixed to the connecting flange 7 on the exhaust pipe 1 side with the sealing ring 5 fixed thereto. 4, and on the outer periphery of this other end is located between the connecting flange 4 and the nut 10 screwed into the threaded portion 8b, and connects both the connecting flanges 4, 7 via the connecting member 8. A spring 11 is provided that urges them toward each other. With the above configuration, both the exhaust pipes 1 and 2 are slidably connected to each other while ensuring airtightness therebetween by the sealing ring 5.

As a feature of the present invention, the exhaust pipe 2 with the flared portion 6 integrally formed thereon is provided with a convex fitting convex portion 12 that bulges in the outer circumferential direction at a portion adjacent to the flared portion 6. , the exhaust pipe 2
The above-mentioned fitting convex portion 1 is attached to the connecting flange 7 fixed to the
2 is formed with a concave fitting recess 13 that can be fitted into the exhaust pipe 2, and when the connecting flange 7 is press-fitted into the flared part 6 side of the exhaust pipe 2, the fitting convex part 12 and the fitting recess 13 are used. Both 2 and 7 are fitted and fixed. The connecting flange 4 on the exhaust pipe 1 side to which the sealing ring 5 is fixed is fixed to the exhaust pipe 1 by welding.

Therefore, in the above embodiment, when fixing the connecting flange 7 to the exhaust pipe 2 which has the flared part 6 integrally formed at one end, first, the other end of the exhaust pipe 2 (the flared part 6 Fit the connecting flange 7 onto the outer periphery of the exhaust pipe 2 from the side opposite to the forming end,
In this externally fitted state, the connecting flange 7 is moved to the side where the flare portion 6 is formed of the exhaust pipe 2. Thereafter, when the fitting recess 13 of the connecting flange 7 and the fitting convex part 12 of the exhaust pipe 2 are made to correspond and the connecting flange 7 is press-fitted onto the outer periphery of the flared part 6, the fitting concave part 13 and the fitting convex part 12 As a result, the connecting flange 7 is fitted and fixed to the exhaust pipe 2 (flare portion 6) and is securely fixed.

In this way, the connecting flange 7 can be fixed to the exhaust pipe 2 integrally formed with the flared part 6 without welding as in the conventional method, so that the sliding surface 6a of the flared part 6 can be fixed by welding. Sliding surface 6 as set without causing thermal deformation
By a, it is possible to improve the ability to exhibit slidability. Further, the generation of cracks due to thermal stress on the exhaust pipe 2 side can be prevented, which is advantageous in preventing exhaust gas leakage.

In the above embodiment, in order to fit and secure the exhaust pipe 2 and the connection flange 7, the exhaust pipe 2 is provided with a convex fitting convex portion 12, and the connection flange 7 is provided with a convex fitting recess 13. However, it goes without saying that conversely, a concave fitting recess may be formed in the exhaust pipe 2 and a convex fitting protrusion may be formed in the connecting flange 7.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal sectional view, and FIG. 2 is a plan view taken along the line - in FIG. 1. 1, 2... Exhaust pipe, 7... Connection flange, 5...
...Sealing ring, 5a...Spherical sliding surface, 6...
...Flare portion, 6a...Sliding surface, 11...Spring, 12...Fitting convex portion, 13...Fitting concave portion.

Claims (1)

[Scope of utility model registration request] A sealing ring having a spherical sliding surface is fixed to one exhaust pipe, and a flared portion having a sliding surface that comes into contact with the spherical sliding surface of the sealing ring is integrally formed on the other exhaust pipe, and both of the exhaust pipes In an engine exhaust pipe connection structure in which both exhaust pipes are slidably connected, the exhaust pipe is provided with a spring that urges connection flanges fixed to the respective parts toward each other in a direction toward each other. An exhaust pipe connection structure for an engine, characterized in that a connecting flange fixed to an exhaust pipe is formed with an uneven fitting part, and both are fitted and fixed.