JPH0223776Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a coupling device for an automobile exhaust pipe.

<Prior Art> As shown in FIG. 1, a flexible bellows pipe A is used as an exhaust pipe connected to an exhaust manifold of an automobile engine in order to absorb engine vibration and displacement.

<Problems to be solved by the invention> The bellows pipe A absorbs vibrations and displacement of the engine and prevents deformation of the exhaust pipe itself, but the bellows pipe A has a thin wall thickness in order to be flexible. , there was a problem with strength. Further, the molding process of the bellows tube A increases the cost, and the maximum outer diameter of the bellows tube A is larger than the outer diameter of a normal exhaust pipe, which is not preferable in terms of space.

<Means for Solving the Problems> The present invention improves the above-mentioned conventional problems, and its characteristic configuration is that an outer ring 5 having a concave spherical surface 6 formed on the inner circumferential surface is attached to the inner diameter of the flange 4. An inner ring 8 having a convex spherical surface 9 corresponding to the concave spherical surface 6 formed on the outer periphery is fitted onto the straight surface 10 on the outer periphery of the end of the exhaust pipe 3. 9 is fitted with the concave spherical surface 6 of the outer ring 5 of the flange 4.

<Operation> With the above configuration, vibrations and displacement of the engine are absorbed by the uneven spherical joint between the inner ring and the outer ring at the flange joint.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 2 and 3. In Fig. 2, 1 is an engine;
2 is the exhaust manifold, 3 is the exhaust pipe, 4
is a flange that connects the exhaust manifold 2, the exhaust pipe 3, and the exhaust pipes 3 to each other.

The present invention, as shown in FIG.
The outer ring 5 is fitted onto the inner diameter of the outer ring 5. This outer ring 5 has a concave spherical surface 6 on its inner circumference and a straight surface 7 on its outer circumference.

Furthermore, an inner ring 8 having a convex spherical surface 9 that spherically fits into the concave spherical surface 6 formed on the outer ring 5 is fitted onto the straight surface 10 on the outer periphery of the end of the exhaust pipe 3. The concave spherical surface 6 of the outer ring 5 of the flange 4 is fitted into the flange 4.

Since the present invention has the above-mentioned configuration, in the state in which it is connected to the exhaust manifold 2 via the flange 4 and in the state in which the exhaust pipes 3 are connected to each other,
Vibration and displacement of the engine 1 are absorbed by the sliding movement of the spherical fitting portion between the concave spherical surface 6 of the outer ring 5 and the convex spherical surface 9 of the inner ring 8.

<Effects of the invention> As described above, according to the invention, an outer ring having a concave spherical surface formed on the inner circumference is fitted onto the inner diameter of the flange, and a convex portion corresponding to the concave spherical surface is formed on the outer peripheral surface of the exhaust pipe end. The structure is such that an inner ring with a spherical surface is fitted, and a flange is spherically fitted to the inner ring at the end of the exhaust pipe via an outer ring, so this spherical joint absorbs engine vibration and displacement. ,
Prevents deformation of the exhaust pipe.

In addition, this spherical joint can be manufactured through a simple process of fitting the outer ring to the straight surface of the inner diameter of the flange and the inner ring to the straight surface of the outer peripheral surface of the exhaust pipe end, reducing manufacturing costs. In addition, the flange joint portion of the exhaust pipe has the advantage that the wall thickness is increased and the strength is increased due to the fitting structure of the outer ring and the inner ring.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the main part of the conventional example, FIG. 2 is a plan view of the present invention, and FIG. 3 is an enlarged sectional view of the main part taken in the direction of the arrow in FIG. 1...Engine, 2...Exhaust manifold, 3...Exhaust pipe, 4...Flange, 5...Outer ring, 6...Concave spherical surface, 7...Straight surface, 8...Inner ring, 9...Convex Spherical surface, 10...
...Straight side.

Claims (1)

[Scope of utility model registration request] An outer ring 5 having a concave spherical surface 6 formed on its inner peripheral surface is fitted onto a straight surface 7 on the inner diameter of the flange 4, and a convex spherical surface 9 corresponding to the concave spherical surface 6 is formed on the straight surface 10 on the outer periphery of the end of the exhaust pipe 3. An inner ring 8 formed on the outer periphery is fitted, and a concave spherical surface 6 of the outer ring 5 of the flange 4 is fitted onto the convex spherical surface 9 of the inner ring 8.
A coupling device for an automobile exhaust pipe, characterized in that a coupling device for an automobile exhaust pipe is fitted with the following.