JP2000104544A - Supporting device for exhaust system part for vehicle internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device to support an exhaust system part, in an internal combustion engine mounted on a vehicle. SOLUTION: When an exhaust emission control system 7 is disposed in the middle of an exhaust pipe 5 running from an exhaust manifold 4 below an internal combustion engine 1 mounted in the engine room 3 of a vehicle 2 with a crankshaft positioned sideways and an exhaust manifold 4 situated frontward, the exhaust emission control system is supported trough a simple mechanism under a state that free pitching and rolling vibration of the internal combustion engine is allowed and inflicting of heat injury on the internal combustion engine is decreased. The part, situated downstream from the exhaust emission control system 7, of the exhaust pipe 5 is supported under the floor of a car body trough a rubber mount 6. Further, a ball type pipe coupling 8 is arranged at a connection part between the exhaust pipe 5 and the exhaust manifold 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for supporting an exhaust system component of an internal combustion engine mounted on a vehicle.

[0002]

2. Description of the Related Art Generally, exhaust gas discharged from an exhaust manifold of an internal combustion engine mounted on a vehicle is purified by providing a catalytic exhaust gas purifying device in the middle of an exhaust pipe thereof, and then the exhaust gas is discharged from the rear of the vehicle to the atmosphere. In this case, conventionally, in this case, the exhaust gas purification device is
Either directly connected to the exhaust manifold, or
It is arranged under the floor of the body of the vehicle.

[0003] As described above, when the exhaust gas purifying device is disposed directly connected to the exhaust manifold or is disposed under the floor of the vehicle body of the vehicle, the exhaust gas purifying device is mounted on the internal combustion engine or the vehicle body. The internal combustion engine can be supported firmly in a state of allowing vibration, but on the other hand, when the exhaust gas purification device is directly connected to the exhaust manifold as in the former, the exhaust gas to the exhaust gas purification device is At high temperatures, the catalyst deteriorates quickly, and when the exhaust gas purifying device is installed under the floor, as in the latter case, the purifying performance decreases due to the low exhaust gas temperature. .

In recent vehicles, an internal combustion engine is mounted in an engine room with a crankshaft lateral to the traveling direction of the vehicle and an exhaust manifold facing forward. Since the exhaust pipe from the exhaust manifold is disposed to extend rearward below the internal combustion engine, the exhaust gas purifying device is disposed in a portion of the exhaust pipe below the internal combustion engine. Is being established.

[0005]

However, as described above,
When the exhaust gas purifying device is arranged below the internal combustion engine,
This exhaust gas purifying device cannot be supported only by attaching the exhaust pipe under the floor, and must be configured to be supported by the internal combustion engine. Therefore, there are the following problems.

That is, the internal combustion engine of the vehicle is mounted on the vehicle body of the vehicle so as to perform pitching and rolling vibrations to a certain extent via a vibration isolating rubber or the like. When configured to support the engine, between the exhaust gas purifying device of the exhaust pipe and a mounting portion of the exhaust pipe to the vehicle body, to allow pitching and rolling vibration in the internal combustion engine. In addition to the need to provide a pipe joint such as a bellows pipe which is stretchable and bendable in all directions, the heat of the exhaust gas purifying device is transferred to an oil pan in an internal combustion engine via a support member. To increase the heat damage to the internal combustion engine.

An object of the present invention is to provide a supporting device which solves these problems.

[0008]

SUMMARY OF THE INVENTION In order to achieve this technical object, the present invention provides an exhaust system having an internal combustion engine mounted on a vehicle with its crankshaft transverse to the traveling direction of the vehicle and attached thereto. An exhaust pipe equipped with a device for purifying exhaust gas from the exhaust manifold, mounted with the manifold facing forward, extends downward from the exhaust manifold,
The exhaust gas purifying device is configured to be bent to pass under the internal combustion engine and then extend rearward under the floor of the vehicle body of the vehicle. On the other hand, a portion of the exhaust pipe on the downstream side of the exhaust gas purification device is supported on a vehicle body of a vehicle, and a connection portion of the exhaust pipe to the exhaust manifold is provided with a ball-type pipe joint. Provide. "
It was configured to say.

[0009]

In this configuration, the exhaust gas purifying device disposed below the internal combustion engine is connected to the exhaust pipe below the floor and connected via a ball-type pipe joint to an exhaust manifold attached to the internal combustion engine. And can be reliably supported by both. Then, in this state, the ball-type pipe joint allows free pitching and rolling vibration in the internal combustion engine.

Therefore, according to the present invention, when the exhaust gas purifying apparatus is disposed below the internal combustion engine, the exhaust gas purifying apparatus is allowed to perform free pitching and rolling vibration in the internal combustion engine. It is not necessary to directly support the internal combustion engine with respect to the internal combustion engine, so that the heat damage caused by the exhaust gas purification device to the internal combustion engine can be reliably reduced, and furthermore, it is only necessary to provide a ball-type pipe joint. In order to allow pitching and rolling vibration in the internal combustion engine, there is no need for a pipe joint such as a bellows tube which is flexible and can be bent in all directions, so that the structure is simple, inexpensive, and lightweight. Has an effect.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In this figure, reference numeral 1 denotes an internal combustion engine, and the internal combustion engine 1 has a crankshaft mounted in an engine room 3 of a vehicle 2 transversely to the traveling direction of the vehicle 2 and on a longitudinal side surface thereof. The exhaust manifold 4 is mounted so as to be freely pitched and rolled within a certain range by a vibration-proof rubber or the like (not shown) in a posture in which the exhaust manifold 4 faces forward.

Reference numeral 5 denotes an exhaust pipe from the exhaust manifold 4. The exhaust pipe 5 extends downward from the exhaust manifold 4, and then bends to pass below the internal combustion engine 1, and then the vehicle 2 And extends rearward under the floor of the vehicle body. As shown in FIG. 3, a portion of the exhaust pipe 5 below the floor of the vehicle body in the vehicle extends over a certain range up and down and left and right through a pair of left and right rubber mounts 6 which are detachably configured. While supporting it so that it can swing
Among them, a catalytic exhaust gas purifying device 7 is provided in a portion below the internal combustion engine 1.

Further, a ball-type pipe joint 8 is provided at a connecting portion of the exhaust pipe 5 to the exhaust manifold 4. As shown in FIG. 2, the ball-type pipe joint 8 has a flange 8 fixed to the lower end of the exhaust manifold 4.
a, and a flange 8b fixed to the upper end of the exhaust pipe 5, and one of the flanges 8a and 8b
b, a spherical concave portion 8c is provided, a spherical seal portion 8d provided on the other flange 8a is rotatably inserted into the spherical concave portion 8c, and the two flanges 8a, 8b are provided.
Are fastened to each other by spring means 8e.

In this configuration, an exhaust gas purifying device 7 disposed below the internal combustion engine 1 includes an exhaust pipe 5 mounted on a vehicle body via a rubber mount 6 and a ball mounted on an exhaust manifold 4 mounted on the internal combustion engine 1. The ball-type pipe joint 8 allows free pitching and rolling vibrations in the internal combustion engine 1, while being reliably supported by both the connection and the die pipe joint 8.

[Brief description of the drawings]

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

FIG. 2 is a vertical sectional front view showing the ball-type pipe joint shown in FIG. 1;

FIG. 3 is an enlarged sectional view taken along line III-III of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Vehicle 3 Engine room 4 Exhaust manifold 5 Exhaust pipe 6 Rubber mount 7 Exhaust gas purification device 8 Ball type pipe joint

Claims (1)

[Claims] An internal combustion engine is mounted on a vehicle with its crankshaft oriented transversely to the direction of travel of the vehicle and an exhaust manifold attached to the engine facing forward, and an apparatus for purifying exhaust gas from the exhaust manifold is provided. An exhaust pipe having a structure that extends downward from the exhaust manifold, and then bends to pass under the internal combustion engine, and then extends rearward under the floor of the vehicle body of the vehicle. The exhaust gas purifying device is disposed in a portion of the exhaust pipe below the internal combustion engine, while a portion of the exhaust pipe downstream of the exhaust gas purifying device is supported on a vehicle body of a vehicle, and A device for supporting exhaust system components in a vehicle internal combustion engine, wherein a ball-type pipe joint is provided at a connection portion of the pipe to the exhaust manifold.