JPH02207122A - Exhauster of vehicle - Google Patents

Abstract

PURPOSE:To suppress dispersion of exhaust noises by arranging, behind an engine, exhaust pipes used for respective front and rear side cylinders of a V-type transverse midship engine with respective catalysers provided thereto, and making exhaust pipe length from each cylinder to each catalyser nearly uniform. CONSTITUTION:In a midship type vehicle loaded with a V-type transverse engine, the V-type transverse midship engine 1 is provided with cylinder lines 3, 4 including respectively three cylinders arranged in a V-type in the longitudinal direction above a cylinder block 2. Further, they are arranged behind a bulkhead H defining the rear part of a compartment R of the vehicle, while also arranged toward the right side of a car body from the center line C of a car width. In this occasion, exhaust pipes 11 to 15, 21 to 25 of respective cylinder lines 3, 4 are extended to the rear of the engine 1 so as to be connected to catalysers 16, 26. And the lengths of the exhaust pipes from the cylinder lines 3, 4 to the catalysers 16, 26 are set nearly uniform, while both catalysers 16, 26 are arranged in the vicinity of nearly the center of the car width.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a V-type transverse engine I5a.
The present invention relates to an exhaust system for a motor vehicle, and in particular to an exhaust pipe and a catalyzer arrangement structure.

[Prior Art] In a mid-engine vehicle equipped with a V-type horizontal engine, an exhaust pipe for the left cylinder and an exhaust pipe for the right cylinder are extended outward from the engine, and a catalyzer (exhaust pipe) is installed in front of each of them. JP-A-63-247 discloses an arrangement structure in which a muffler is installed in front of each engine, and a muffler is installed in front of each engine.
This method is publicly known in Japanese Patent No. 120. This makes the weight distribution on the left and right sides of the vehicle uniform, and also makes the length of the exhaust pipes from both the left and right cylinders to the respective catalytic converters equal to prevent variations in exhaust sound.

[Problem to be solved by the invention] However, providing each catalytic converter and muffler on the left and right sides of the vehicle body in front of the engine reduces the interior of the vehicle, and the interior of the vehicle is likely to be affected by exhaust noise. This becomes a problem.

Therefore, the purpose of the present invention is to adopt a V-type horizontally mounted midship engine instead of a vertically mounted engine, and to suppress variations in exhaust sound by making the exhaust pipes from the front and rear inner cylinders to the respective catalytic converters have approximately equal lengths. , make the interior of the vehicle smaller,
While locating each exhaust pipe and catalytic converter behind the engine, the weight of the exhaust system up to the catalytic converter is brought closer to the center of the vehicle width to improve the weight balance of the vehicle, without affecting the body roll. An object of the present invention is to provide an exhaust system that can suppress the influence of weight.

[Means for Solving the Problems] In order to achieve the above problems, the present invention provides an exhaust pipe for the front cylinder and an exhaust pipe for the rear cylinder at the rear of the engine in a mid-ship vehicle equipped with a V-type horizontal engine. The exhaust pipes are extended, and a catalytic converter is provided in each exhaust pipe, and the lengths of the exhaust pipes from the front and rear inner cylinders to the respective catalytic converters are approximately equal, and both catalytic converters are placed close to each other about the width of the vehicle. do.

The detailed arrangement structure of each exhaust pipe and catalyzer is as follows.

The front cylinder exhaust pipe passes below the engine along the width of the vehicle and is connected to the catalytic converter.

The exhaust pipe for the rear cylinder extends to one side, then reverses and bends to the other side, and is connected to the catalytic converter.

Both catalyzers are arranged one above the other.

[Function] The exhaust pipes for the front cylinders and the exhaust pipes for the rear cylinders of a VWI-mounted mid-ship engine are extended to the rear of the engine, and a catalytic converter is provided on each of them, and the exhaust pipes from the front and rear inner cylinders to the respective catalytic converters are extended to the rear of the engine. Since the exhaust pipes are of approximately equal length, variations in exhaust sound are suppressed, and by arranging each exhaust pipe and catalytic converter to the rear of the engine, it is possible to eliminate the influence of space and noise into the passenger compartment.

Since both catalytic converters are placed close to the center of the vehicle width, the weight of the exhaust system up to both catalytic converters can be brought closer to the center of the vehicle width, contributing to a better weight balance of the vehicle.
Therefore, the influence of the weight of the exhaust system up to both catalyzers on the vehicle body roll can be suppressed.

[Example] Examples will be described below based on the accompanying drawings.

In FIG. 1, which shows the rear part of a vehicle equipped with an exhaust system to which the present invention is applied, l is a ■-type transverse midship engine, 6 is a rear bumper, C is a vehicle width center line, and S is a body line on both left and right sides. It is. The engine 1 is equipped with cylinder rows 3.4 of three cylinders arranged in a V-shape at the front and rear of the cylinder block 2 as shown in FIG. . As shown in FIG. 1, this engine 1 is located behind a bulkhead H that defines the rear part of a vehicle interior R, and is located closer to the right side of the vehicle body than the vehicle width center line C. In Figure 1, E is the engine room line, T is the left and right Stroud towers, and W is the left and right rear wheels.

In the V-type horizontal midship engine l as described above, an exhaust manifold 11 connected to three cylinders is provided on the forward-slanting front wall of the front cylinder row 3.
A first exhaust pipe 13 is connected to a gathering part 12 at the lower center of the exhaust pipe 1 . A flexible second exhaust pipe 14 for absorbing thermal expansion is connected to the rear part of the first exhaust pipe 13, and both the first and second exhaust pipes 13,14 are straight, pass below the engine l, and As shown in Fig. 1, it is arranged near the right side of the vehicle width center line C. A short third exhaust pipe 15 is connected to the rear of the second exhaust pipe 14, and a catalytic converter 16 is connected to the end of the third exhaust pipe 15 that is slightly bent toward the vehicle width center line C side.

The catalytic converter 16 has a sufficiently large volume and has a built-in catalyst for exhaust purification as is known, and is positioned behind the engine L and on the vehicle width center line C. .

A fourth exhaust pipe 17 is connected to the end of the catalytic converter 16 that protrudes to the left beyond the vehicle width center line C.
7 extends toward the left side of the vehicle body and is bent rearward. A fifth exhaust pipe 18 is connected to the rearwardly bent end of the fourth exhaust pipe 17, and the fifth exhaust pipe 18 is inverted and bent toward the vehicle width center line C.

On the other hand, an exhaust manifold 21 connected to the three cylinders is also provided on the rear wall of the rear cylinder row 4 that tilts backwards, and a lateral gathering portion 2 of the exhaust manifold 21 extends to the vehicle width center line C.
A first exhaust pipe 23 is connected to 2. First exhaust pipe 23
is a straight pipe extending from the vehicle width center line C to the left side of the vehicle body, and the second exhaust pipe 24 is connected to the left end portion of the first exhaust pipe 23.

The second exhaust pipe 24 is inverted and bent toward the vehicle width center line C, and is further connected to a flexible third exhaust pipe 25 for absorbing thermal expansion. A catalytic converter 26 is connected to an end of the third exhaust pipe 25 extending to the vehicle width center line C.

This catalytic converter 26 is also located at the rear of the engine l,
It extends toward the right side from the vehicle width center line C, and is arranged above the catalytic converter 16 . Further, a fourth exhaust pipe 27 is connected to the right end portion of the catalytic converter 26 that is slightly bent rearward, and a fifth exhaust pipe 28 is connected to the rear end portion of the short fourth exhaust pipe 27 that is slightly bent rearward. The exhaust pipe 28 is inverted and bent toward the vehicle width center line C.

The inner ends of the exhaust pipes 18 and 28 of both cylinders 5 are connected to the left and right sides of the front part of the collection chamber 31.

Sixth exhaust pipes 32 and 33 are connected to the rear left and right sides of the collecting chamber 31, respectively. As shown in the figure, mufflers 41.45 are connected to the slightly forwardly bent outer ends of the sixth exhaust pipes 32,33 that extend toward the outside of the vehicle body. 4th and 5th
The tail pipes 1718, 27, and 28 are located on the outside of each of the exhaust pipes 1718, 27, and 28, and two tail pipes 42.
42, 48, and 46 are provided.

A perspective view of the entire exhaust system is shown in FIG.

The exhaust system of the present invention with the above arrangement structure has an exhaust pipe length from the front cylinder row 3 to the catalytic converter 16 via each of the third exhaust pipes 13, 14 and 15 including the exhaust manifold 11, and Exhaust manifold 21 from cylinder row 4
The length of the exhaust pipe from the first to third exhaust pipes 23, 24, and 25 to the catalytic converter 26 is set to be the same length.

In addition, as shown in FIG. 2, the front and rear exhaust manifolds 11
．． 21 are provided with 02 sensors 8 and 9, respectively, the front cylinder exhaust manifold 11 is provided with a manifold cover 51 that covers the top surface, and the rear cylinder exhaust manifold 21 is provided with a manifold cover 52 that covers the surrounding area. It is provided.

Furthermore, as shown in FIG. 1, an ACG 55 is disposed on the right side of the V-bank of the engine 1, and an expansion tank 56, an oil cooler 57, and an emission control box 58 are disposed adjacent to the left side of the rear cylinder row 4. has been done.

As mentioned above, the heat exchanger (oil cooler 57) and expansion tank 56 (engine Heat shielding measures are taken for auxiliary equipment such as cooling water vapor-liquid separator).

And each catalyzer 16.26 has a respective stay 61,
62 is mounted on the car body, and each muffler 41
．． 45 is mounted on the vehicle body with front and rear stays 43°, 44, 47, and 48, respectively.

As mentioned above, V type horizontal midship engine l? In the vehicle equipped with the vehicle, a catalyzer 16 for purifying exhaust gas from the front cylinder row 3 and a catalyzer 26 for purifying exhaust gas from the rear cylinder row 4 are provided separately, and both catalyzers 16
．． 26 is placed behind the engine 1, and the re-exhaust pipe lengths from each of the cylinder rows 3.4 before and after 1 to each catalytic converter 16.26 are made equal in length, so that the exhaust noise from each cylinder row before and after 1 is made equal. While suppressing variations, it does not affect the space inside the vehicle and eliminates problems such as noise.

In the embodiment, the engine l is arranged to the right of the vehicle width center line C, and the exhaust pipes 13 and 1 include the exhaust manifold 11 from the front cylinder row 3 to the catalytic converter 16.
4.15 is placed near the right side of the vehicle width center line C, while the exhaust pipes 23 and 24.25 including the exhaust manifold 21 from the rear cylinder row 4 to the catalytic converter 26 are projected to the left side of the vehicle width center line C. Turn around and return to vehicle width center line C
At the same time, the front cylinder catalytic converter 16 crosses the vehicle width center line C and faces to the left, and the rear cylinder catalytic converter 26 is placed above it to the right from the vehicle width center line C. By bringing the weight of the exhaust system close to the vehicle width center line C, it is possible to distribute it evenly between the left and right sides, and the weight balance of the vehicle can be improved.

In other words, the influence of the weight of the exhaust system up to both catalyzers on the vehicle body roll can be suppressed.

In the embodiment, a V-hole cylinder engine was used.

The number of cylinders is arbitrary.

[Effects of the Invention] As described below, according to the present invention, the exhaust pipes for the front and rear cylinders of a V-type horizontally mounted midship engine mounted on a vehicle are extended to the rear of the engine to form a catalytic converter. The length of the exhaust pipes from the front and rear cylinders to the respective catalytic converters is approximately the same, which suppresses variations in exhaust sound, and by arranging the exhaust pipes and catalytic converters toward the rear of the engine, the length of the exhaust pipes from the front and rear cylinders to the respective catalytic converters is approximately equal. The effects of space and noise can be eliminated.

Since both catalytic converters are placed close to the center of the vehicle, the weight of the exhaust system up to one catalytic converter can be brought closer to the center of the vehicle width, contributing to improving the weight and balance of the vehicle. The effect of this on vehicle body roll can be suppressed, without impairing the inherent maneuverability of the midship.

[Brief explanation of the drawing]

FIG. 1 is a perspective plan view of the rear part of a vehicle equipped with an exhaust system for a V-type transverse midship engine according to the present invention, FIG. 2 is a side view of the exhaust system, and FIG. 3 is a perspective view of the exhaust system. In addition, in the drawing, l is a V-type horizontally mounted midship engine, 3
is the front cylinder row, 4 is the rear cylinder row, 11°13.14.1
5 is the exhaust pipe for the cylinder in front of the catalytic converter, 16 is the catalytic converter for the cylinder in front of the catalytic converter, 21.23, 24.25 is the exhaust pipe for the cylinder in the rear up to the catalytic converter, 26 is the catalytic converter for the cylinder in the same diameter side, C is the vehicle width center line.

Claims (1)

[Claims] 1. In a mid-ship vehicle equipped with a V-type horizontal engine, an exhaust pipe for the front cylinder and an exhaust pipe for the rear cylinder are extended to the rear of the engine, and a catalyzer is installed in each exhaust pipe. What is claimed is: 1. An exhaust system for a vehicle, characterized in that the exhaust pipe lengths from both the front and rear cylinders to the respective catalytic converters are approximately equal in length, and both catalytic converters are disposed close to each other substantially in the center of the vehicle width. 2. The exhaust system for a vehicle according to claim 1, wherein the exhaust pipe for the front cylinder passes below the engine along approximately the center of the vehicle width and is connected to the catalytic converter. 3. The exhaust system for a vehicle according to claim 1, wherein the exhaust pipe for the rear cylinder extends to one side, then reverses and bends to the other side, and is connected to the catalytic converter. 4. The vehicle exhaust system according to claim 1, wherein both the catalyzers are arranged one above the other.