JP2004324622A - Exhaust pipe device of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To have an enough exhaust pipe length even when a distance from an engine to the rear end of a vehicle is short, and to facilitate layout design of an engine room and so on. <P>SOLUTION: An exhaust pipe 3 extends from an engine 2 to the rear part of a high frequency silencer 4 through an exhaust manifold 3A and first to fourth pipe conduits 3B to 3E, and then turns at the fourth pipe conduit 3E so that a fifth conduit 3F extends to the front part of the vehicle. Further, the exhaust pipe 3 passes through the high frequency silencer 4, a sixth conduit 3G and a low frequency silencer 5, and again turns back so that a seventh conduit 3H extends to the rear part of the vehicle. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an exhaust pipe device for a vehicle such as an automobile, and more particularly to an exhaust pipe device suitable for an MR (midship engine-rear drive) type or RR (rear engine-rear drive) type automobile.
[0002]
[Prior art]
In general, an exhaust pipe mounted on a vehicle such as an automobile is disposed so as to extend from an engine toward the rear of the vehicle, and is configured to discharge exhaust gas from the engine toward the rear of the vehicle (for example, And Patent Document 1). This exhaust pipe has a function of gradually reducing the periodic pressure change (sound pressure level) of the exhaust gas corresponding to the piston cycle of the engine while the exhaust gas flows through the exhaust pipe, thereby reducing exhaust noise. ing.
[0003]
[Patent Document 1]
JP-A-8-291710 (paragraph number [0039], FIG. 2)
[0004]
[Problems to be solved by the invention]
By the way, when the exhaust pipe according to the related art is applied to an MR or RR type vehicle, the engine is mounted on the rear side of the vehicle, so that the distance from the engine to the rear end of the vehicle is reduced. As a result, there is a problem in that the length of the exhaust pipe cannot be sufficiently long, and the noise reduction effect of the exhaust pipe is reduced.
[0005]
Therefore, a method is conceivable in which the length of the exhaust pipe is ensured by bending the exhaust pipe plural times so as to meander in an S-shape, for example. However, in this case, the meandering of the exhaust pipe narrows the space in the front-rear direction and the like in the engine room, which makes it difficult to design the layout of various devices and pipes installed in the engine room. is there.
[0006]
Therefore, the present invention provides an exhaust pipe for a vehicle in which the length of the exhaust pipe can be sufficiently ensured even when the distance from the engine to the rear end of the vehicle is short, and the layout design and the like in the engine room can be easily performed. It is intended to provide a device.
[0007]
[Means for Solving the Problems]
The present invention is configured as follows in order to solve the above-mentioned problem.
The invention according to claim 1 is an exhaust pipe for discharging exhaust gas from an engine, a high-frequency muffler provided in the middle of the exhaust pipe, and a series connected to the high-frequency muffler provided in the middle of the exhaust pipe. And a low-frequency muffler connected to the exhaust pipe device of the vehicle, wherein, of the high-frequency muffler and the low-frequency muffler, the muffler arranged on the upstream side has a muffler arranged on the downstream side. An exhaust pipe device for a vehicle, wherein the exhaust pipe is extended from the rear and connected to a muffler arranged in the front and the upstream side.
[0008]
According to the first aspect of the present invention, the exhaust pipe is temporarily extended from the engine to the rear of the muffler disposed on the upstream side, and then turned back to extend forward of the vehicle, whereby the exhaust pipe is arranged on the upstream side. Can be connected to the muffler from behind. That is, the exhaust pipe can be connected to the muffler by bypassing the rear side of the muffler from the engine, and the entire length of the exhaust pipe can be secured longer by the amount of the bypass of the exhaust pipe. .
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
An example in which an exhaust pipe device for a vehicle according to an embodiment of the present invention is applied to an automobile will be described in detail with reference to the accompanying drawings in FIGS.
[0010]
FIG. 1 is a plan view showing the exhaust pipe device of the vehicle according to the present embodiment, FIG. 2 is a left side view showing the exhaust pipe device of the vehicle in FIG. 1, and FIG. FIG. 4 is a rear view showing the exhaust pipe device of the vehicle. 4 is a perspective view of the exhaust pipe device of the vehicle in FIG. 1 as viewed from the front side of the vehicle, and FIG. 5 is a perspective view of the exhaust pipe device of the vehicle in FIG. 1 as viewed from the rear side of the vehicle. 6 is a perspective view of the exhaust pipe device of the vehicle in FIG. 1 as viewed from below the vehicle.
[0011]
An exhaust pipe device 1 (hereinafter, referred to as an exhaust pipe device 1) for a vehicle according to the present embodiment includes an engine 2, an exhaust pipe 3 connected to the engine 2 for discharging exhaust gas from the engine 2 to the outside, and an exhaust pipe 3. It includes a high-frequency muffler 4 provided in the middle of the pipe 3 and a low-frequency muffler 5 provided in the middle of the exhaust pipe 3 and connected in series with the high-frequency muffler 4. Further, of the high-frequency silencer 4 and the low-frequency silencer 5, the high-frequency silencer 4 is arranged on the upstream side, and the low-frequency silencer 5 is arranged on the downstream side. Further, the high-frequency silencer 4 is disposed in front of the vehicle with respect to the low-frequency silencer 5, and each of the silencers 4, 5 is mounted horizontally on the vehicle.
[0012]
Here, the exhaust pipe 3 extends downward from the exhaust manifold 3A attached to the exhaust side of the engine 2 and two from the exhaust manifold 3A, and is bent into a substantially L-shape from the exhaust manifold 3A. A first conduit portion 3B extending to the lower side of the high-frequency muffler 4 (see FIGS. 2 and 4 to 6), and a first conduit portion 3B bent and extended from the first conduit portion 3B toward the left side of the vehicle. The two pipe sections 3C (see FIGS. 1, 4 and 6) and a substantially U-shape from the second pipe section 3C toward the rear of the high-frequency muffler 4 (the rear end of the low-frequency muffler 5). A third conduit portion 3D (see FIGS. 1, 3, 4, and 6) that extends in a bent shape, and a fourth conduit portion that extends straight from the third conduit portion 3D toward the right side of the vehicle. (See FIGS. 1, 3, 5, and 6).
[0013]
In addition, the exhaust pipe 3 is folded back from the fourth pipe section 3E, bends and extends in a substantially U-shape toward the front of the vehicle, and is connected to the right end side of the high-frequency muffler 4 from the rear with a fifth pipe. A portion 3F (see FIGS. 1, 3, 5, and 6) and a sixth U-shaped bent and extended from the left end of the high-frequency muffler 4 to the left end of the low-frequency muffler 5. It has a pipe section 3G and a seventh pipe section 3H which is bent substantially in an L shape from the left end side of the low-frequency muffler 5 and extends rearward of the vehicle.
[0014]
That is, the exhaust pipe 3 temporarily extends from the engine 2 to the rear of the high-frequency muffler 4 via the exhaust manifold 3A and the first to fourth pipe sections 3B to 3E, and is turned back from the fourth pipe section 3E to form the fourth pipe section. A fifth conduit section 3F extends forward of the vehicle. The exhaust pipe 3 is configured so as to sequentially pass through the high-frequency muffler 4, the sixth pipe section 3G, and the low-frequency muffler 5, and then extend the seventh pipe section 3H toward the rear of the vehicle again. Have been.
[0015]
The high-frequency silencer 4 contains glass wool or the like therein, and muffles high-frequency exhaust noise while exhaust gas from the engine 2 passes through the high-frequency silencer 4. Further, the low-frequency muffler 5 guides the exhaust gas flowing at a high pressure from the high-frequency muffler 4 via the pipe section 3G of the exhaust pipe 3 to a room called an expansion chamber (not shown). To mute the low frequency exhaust noise.
[0016]
A catalyzer 6 is provided in the middle of the pipe section 3E of the exhaust pipe 3, and the catalyzer 6 removes carbon monoxide, hydrocarbons, nitrogen oxides, and the like contained in the exhaust gas from the engine 2 to a catalyst. It is used to turn it into a harmless component.
[0017]
In the exhaust pipe device 1 configured as described above, when the engine 2 operates, the exhaust gas from the engine is supplied to the exhaust manifold 3A, the first to fifth pipe sections 3B to 3F, the high-frequency silencer 4, and the sixth The air passes through the pipe section 3G, the low-frequency silencer 5, and the seventh pipe section 3H sequentially and is discharged to the rear of the vehicle. During the operation of the engine 2, while the exhaust gas passes through the exhaust pipe 3, the periodic pressure change of the exhaust gas corresponding to the piston cycle of the engine 2 is gradually suppressed to reduce the exhaust noise. Further, since the high-frequency muffler 4 and the low-frequency muffler 5 are provided in the middle of the exhaust pipe 3, the exhaust gas of the exhaust gas is more effectively silenced by the mufflers 4 and 5.
[0018]
By the way, in the case of the MR type automobile, since the engine 2 is mounted on the rear side of the vehicle, the distance between the engine 2 and the rear end of the vehicle becomes short, and it is difficult to secure the length of the exhaust pipe 3. Become.
[0019]
Therefore, in the present embodiment, the exhaust pipe 3 is once extended from the engine 2 to the rear of the high-frequency muffler 4 and then turned back from the engine 2 to return to the front of the vehicle. The connection is made from the side.
[0020]
Therefore, the exhaust pipe 3 can be connected to the high frequency muffler 4 by bypassing the rear side of the high frequency muffler 4 from the engine 2 like the first to fourth pipe sections 3B to 3E. In this case, the entire length of the exhaust pipe 3 can be ensured to be longer by an amount corresponding to the detour of the exhaust pipe 3, so that the exhaust noise of the exhaust pipe 3 can be further reduced.
[0021]
Further, as described in the related art, the exhaust pipe does not need to be bent and bent a plurality of times so as to meander from the engine 2 toward the rear of the vehicle, and a wide space in the front-rear direction and the like in the engine room can be secured. Layout design and the like of various devices and pipes installed in the room can be easily performed.
[0022]
In the above-described embodiment, an example is given in which the high-frequency muffler is arranged on the upstream side, the low-frequency muffler is arranged on the downstream side, and the high-frequency muffler is arranged in front of the low-frequency muffler. Explained. However, the present invention is not limited thereto.For example, the high-frequency silencer may be arranged on the downstream side, the low-frequency silencer may be arranged on the upstream side, and the low-frequency silencer may be arranged in front of the high-frequency silencer. Good.
[0023]
Further, in the above-described embodiment, the case where the exhaust pipe device 1 is applied to an MR type vehicle has been described as an example. However, the present invention is not limited to this, and may be applied to, for example, an RR type vehicle. Alternatively, the present invention may be applied to an FR (front engine-rear drive) type or FF (front engine-front drive) type vehicle.
[0024]
【The invention's effect】
As described above in detail, according to the first aspect of the present invention, the muffler arranged on the upstream side is arranged ahead of the muffler arranged on the downstream side, and the muffler arranged on the upstream side Is configured to connect the exhaust pipe from the rear thereof, so that the exhaust pipe can be connected to the muffler by bypassing the rear side of the muffler arranged on the upstream side from the engine, and the exhaust pipe can be bypassed. The length of the exhaust pipe can be increased by the length of the exhaust pipe, so that the exhaust pipe can be more effectively silenced by the exhaust pipe. Further, a large space in the front-rear direction and the like in the engine room can be secured, and the layout design of various devices, piping, and the like provided in the engine room can be easily performed.
[Brief description of the drawings]
FIG. 1 is a plan view showing an exhaust pipe device for a vehicle according to the present embodiment.
FIG. 2 is a left side view showing the exhaust pipe device of the vehicle in FIG.
FIG. 3 is a rear view showing the exhaust pipe device of the vehicle in FIG. 1;
FIG. 4 is a perspective view of the exhaust pipe device of the vehicle in FIG. 1 as viewed from the front side of the vehicle.
FIG. 5 is a perspective view of the exhaust pipe device of the vehicle in FIG. 1 as viewed from a rear side of the vehicle.
FIG. 6 is a perspective view of the exhaust pipe device of the vehicle in FIG. 1 as viewed from below the vehicle.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Exhaust pipe apparatus 2 Engine 3 Exhaust pipe 3A Exhaust manifold 4 High frequency muffler 5 Low frequency muffler 6 Catalyzer

Claims (1)

An exhaust pipe for discharging exhaust gas from the engine, a high-frequency muffler provided in the middle of the exhaust pipe, and a low-frequency muffler provided in the middle of the exhaust pipe and connected in series with the high-frequency muffler; In a vehicle exhaust pipe device comprising:
Of the high-frequency muffler and the low-frequency muffler, the muffler arranged on the upstream side is arranged in front of the muffler arranged on the downstream side,
An exhaust pipe device for a vehicle, wherein the exhaust pipe is connected to the muffler arranged on the upstream side by extending the exhaust pipe from the rear side.

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