JPH06248946A - Exhaust pipe for engine - Google Patents

Abstract

PURPOSE:To provide exhaust pipe structure for an engine capable of absorbing vibration in all the directions by plural sealing rings. CONSTITUTION:An exhaust pipe, connected to the exhaust manifold 2 of an engine 1, is divided into at least three parts like respective parts 3, 4, and 9; and the middle exhaust pipe 4 of the exhaust pipe, divided into these three parts, is connected to both of the side pipes 3 and 9 via sealing rings 5 and 6 respectively. The middle exhaust pipe 4, connected by these sealing rings 5 and 6, is bent to direct the sealing rings 5 and 6, located on both the sides of the exhaust pipe 4, to a nonparallel condition by this bending. Since vibration absorbing is not made in the axis direction of the exhaust pipe 4 by the sealing rings 5 and 6 respectively and is made in a direction crossing the axis direction, consequently vibration absorbing to all directions can be made by two sealing rings 5 and 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine exhaust pipe applied to an automobile engine.

[0002]

2. Description of the Related Art An exhaust pipe connected to an engine of an automobile has one end connected to an exhaust manifold of the engine and the other end reaching a tail pipe through a catalyst device and a muffler. Connections to the exhaust manifold of the engine are made on the sides of the engine, and connections to the catalytic device or muffler are made below the engine and at the rear of the vehicle body.

As described above, since the exhaust pipe is connected to the engine, it is susceptible to vibration generated by the engine, which causes abnormal noise and shortens the life of the engine. In order to achieve this, the exhaust pipe is divided into several parts, and a seal ring is interposed at this joint to absorb vibrations between the exhaust pipes connected by this seal ring. As a structure of the seal ring, there is known a structure in which a seal body is interposed between connected exhaust pipes and a spring is pressed so that the seal body does not fall off (see Japanese Utility Model Laid-Open No. Sho 60-1913). ).

FIG. 4 schematically shows a structure in which the vibration of the exhaust pipe is suppressed by the seal ring as described above. In this figure, 1 is an engine, 2 is an exhaust manifold forming a part of an exhaust pipe, and 3 and 4 are exhaust pipes. Seal rings 5 and 6 are provided between the exhaust manifold 2 and the exhaust pipe 3 and between the exhaust pipes 3 and 4.

By arranging the two seal rings 5 and 6 in such a direction as described above, the X direction (FIG.
(See FIG. 4), the effect of absorbing vibrations in the Y direction, which is the front-back direction with respect to the vehicle body in the horizontal direction, and in the Z direction (see FIG. 4), which is the vertical direction with respect to the vehicle body.

However, there are cases where the two seal rings 5 and 6 cannot be arranged in such an orientation due to the layout in the engine room. That is, depending on the position of the catalyst device, the turbocharger, etc., the upper seal ring 5 may not be able to be arranged at this position, so that vibration absorption in the Z direction may not be possible.

Therefore, as shown in FIG. 6, two seal rings 5 and 6 are arranged avoiding the position of the catalyst device 7 and the like. In this case, the seal rings are arranged in the axial direction of the exhaust pipe. 6 and 7, vibrations in the X and Z directions can be absorbed, but vibrations in the Y direction in FIGS. 6 and 7 can be absorbed. It will not be possible. In the figure, 8 is also an exhaust pipe.

[0008]

The present invention has been made in view of this point, and even if the two seal rings 5 and 6 are arranged in the lower portion of the engine 1, all the directions are possible. It is intended to provide a structure capable of absorbing vibration.

[0009]

As a means for solving the above problems, the present invention divides an exhaust pipe connected to an exhaust manifold of an engine into at least three parts, and the exhaust pipe divided into these three parts. The central one is connected to both sides via the seal rings respectively, the central exhaust pipe connected by the seal rings is bent, and the bending causes the seal rings located at both ends of the exhaust pipe to be non-parallel. It has a configuration suitable for the state.

[0010]

According to this structure, the two seal rings facing non-parallel to each other absorb the vibration in the direction intersecting with the axial direction of the exhaust pipe, resulting in X, Vibrations in all Y and Z directions can be absorbed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 1 is an engine, 2 is an exhaust manifold, 3 and 4 are exhaust pipes, and 9 is a muffler. In the present invention, this muffler 9 is also regarded as an exhaust pipe. A flange 10 is provided at one end of the exhaust pipe 3,
The flange 10 connects the exhaust manifold 2. A flange 11 is provided at the other end of the exhaust pipe 3 so as to face a flange 12 provided at one end of the exhaust pipe 4. The flanges 11 and 12 are connected by a bolt (not shown), and the seal ring 5 is interposed between them.

As shown in FIG. 1, the exhaust pipe 4 has a non-linear shape, and a part of it is in a horizontal plane (see FIG. 3).
It is bent in a V shape. Therefore, the flange 13 provided at the end opposite to the flange 12 is
And will turn to the non-parallel state. The flange 14 provided at the front part of the muffler 9 also has an angle with the longitudinal direction of the muffler 9, and when the muffler 9 is oriented along the longitudinal direction of the vehicle body (not shown), the connection with the bent exhaust pipe 4 is made. I try not to cause any trouble. A seal ring 6 is interposed between the flanges 13 and 14. Due to the shape of the exhaust pipe 4, the seal ring 6 faces in a direction not parallel to the seal ring 5.

2 and 3 are views for explaining the operation of the exhaust pipe of the engine thus constructed. By arranging the seal rings 5 and 6 in this way, the two seal rings 5 and 6 absorb vibrations in the directions intersecting the axial directions of the exhaust pipes 3 and 4, respectively.
The vibration can be absorbed in the three directions of X, Y, and Z directions.

Although the exhaust pipe 4 is bent in the horizontal plane in the above embodiment, the same effect can be obtained by bending it in the vertical plane. Further, although the engine 1 has been described as being placed horizontally with respect to the vehicle body, the same effect can be obtained even if the engine 1 is placed vertically.

[0015]

Since the present invention is the exhaust pipe of the engine configured as described above, one of the seal rings cannot be arranged above due to the position of the catalyst device, the turbocharger, or the like. Even if it exists, it can absorb vibration in all directions.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining the operation of the one shown in FIG.

FIG. 3 is an explanatory view showing the thing of FIG. 2 seen from below.

FIG. 4 is an explanatory diagram for explaining the action of the seal ring.

FIG. 5 is an explanatory view showing the thing of FIG. 4 seen from below.

FIG. 6 is an explanatory diagram showing a location of a conventional seal ring.

FIG. 7 is an explanatory view showing the thing of FIG. 6 seen from below.

[Explanation of symbols]

 1 Engine 2 Exhaust Manifold 3 Exhaust Pipe 4 Exhaust Pipe 5 Seal Ring 6 Seal Ring 11 Flange 12 Flange 13 Flange 14 Flange

Claims (1)

[Claims] 1. An exhaust pipe connected to an exhaust manifold of an engine is divided into at least three parts, and the central one of the exhaust pipes divided into these three parts is connected to both sides via respective seal rings. An exhaust pipe for an engine, characterized in that a central exhaust pipe connected by the seal ring is bent and the seal rings located at both ends of the exhaust pipe are oriented in a non-parallel state by the bending.