JP2002371841A - Engine exhaust device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine exhaust device for a vehicle capable of absorbing roll vibration of an engine, vibration in the axial direction of an exhaust system, and vertical vibration of the exhaust system and corresponding to the case where a front exhaust system and a rear exhaust system are provided together in the same vehicle easily. SOLUTION: A first spherical joint 7 allowing the displacement in the vertical direction of the vehicle is provided at positions of inclined parts 5d, 8a of a front tube 5 whose axis of the tube faces the direction of a roll center K of the transversely mounted engine 1 and a first center tube 8 behind the vehicle of the transversely mounted engine 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a vehicle engine exhaust system in which a spherical joint for absorbing vibration is installed in the exhaust system.

[0002]

2. Description of the Related Art Conventionally, in an exhaust system of an automobile, there has been known an exhaust system in which a flexible tube is provided in the exhaust system in order to reduce vibration transmitted from an engine and vibration transmitted from a road surface. This flexible tube has the advantage that it can absorb any relative displacement within the allowable deformation range of the tube itself, regardless of whether the vibration direction transmitted to the exhaust system is vertical, horizontal, or axial. However, it must be installed so as not to interfere with the adjacent members even with a large amount of deformation, so that there is a disadvantage that the installation space is increased and the cost is high.

[0003] Therefore, a spherical joint is used instead of the flexible tube. As a vehicle engine exhaust device having a spherical joint installed in an exhaust system, for example, Japanese Unexamined Patent Publication No.
The one described in Japanese Patent No. 218863 is known.

It is an object of this publication to improve both strength and durability by absorbing both a vertical vibration component and a front-back vibration component transmitted from an engine to an exhaust pipe, suppressing an excessive stress generated in the exhaust pipe. The exhaust pipe from the horizontal engine is connected in an airtight manner to the upstream exhaust pipe and the downstream exhaust pipe to a portion extending substantially linearly in the vehicle front-rear direction and a portion extending substantially linearly in the vehicle left-right direction. In addition, there is described an exhaust device in which a spherical joint that allows relative rotation of the two exhaust pipes in a direction orthogonal to the extension direction of the connected two exhaust pipes is inserted.

[0005]

However, in the conventional vehicle engine exhaust system, the vertical vibration of the exhaust pipe is controlled by the first spherical joint 3A, and the longitudinal vibration of the exhaust pipe is controlled by the second spherical joint 3A.
B has a configuration in which a plurality of spherical joints 3A and 3B are required because the respective structures are configured to absorb light.

Further, as shown in FIG. 2 of the official gazette, the press-connecting mechanism 26 of the second spherical joint 3B is paired in the vehicle vertical direction, and the second spherical joint 3B is in the vehicle vertical direction. The structure is such that relative movement cannot be absorbed (relative movement is possible in the front-back direction). Therefore, the vertical vibration of the rear muffler (muffler 32) generated by the idle vibration,
The vertical vibration of the exhaust system due to road surface input cannot be absorbed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and its object is to absorb both the roll vibration of the engine, the axial vibration of the exhaust system, and the vertical vibration of the exhaust system. In addition, an object of the present invention is to provide a vehicle engine exhaust system that can easily cope with a case where a front exhaust system and a rear exhaust system are provided in the same vehicle.

[0008]

To achieve the above object, according to the first aspect of the present invention, an exhaust pipe extending from a horizontal engine mounted on a front portion of a vehicle to a rear portion of the vehicle, and the exhaust pipe is provided. In a vehicle engine exhaust system having a muffler provided at an intermediate position of a pipe and an insulator for supporting these exhaust system members on a vehicle body, a pipe axis of the horizontal engine is located at a rear side of the vehicle, and a pipe axis of the engine is provided. A first spherical joint that allows displacement in the vertical direction of the vehicle is provided at a position of the exhaust pipe facing the center.

According to a second aspect of the present invention, in the vehicle engine exhaust system according to the first aspect, the exhaust pipe is connected to an exhaust manifold disposed on a vehicle front side of the horizontal engine, and is connected to the exhaust manifold. It is a front exhaust system that extends below the stationary engine toward the rear of the vehicle.

According to a third aspect of the present invention, in the engine exhaust system for a vehicle according to the second aspect of the present invention, the horizontal axis of the horizontal engine is located at a position of an exhaust pipe whose pipe axis is oriented substantially vertically. , The second to allow displacement in the longitudinal direction of the vehicle
A spherical joint is provided.

According to a fourth aspect of the present invention, in the engine exhaust system for a vehicle according to the first aspect, the exhaust pipe is connected to an exhaust manifold disposed on the vehicle rear side of the horizontal engine, and is directly connected to the exhaust manifold. It is a rear exhaust system directed to the rear of the vehicle.

[0012]

According to the first aspect of the present invention, of the exhaust pipe extending from the horizontal engine mounted on the front part of the vehicle to the rear part of the vehicle, the vehicle is located on the rear side of the horizontal engine. At a position of an exhaust pipe whose pipe axis faces the direction of the roll center of the engine, a first spherical joint that allows displacement in the vertical direction of the vehicle is provided.

Accordingly, with respect to the roll vibration of the engine, of the exhaust pipes connected to the first spherical joint, only the upstream exhaust pipe on the engine side uses the first spherical joint as a fulcrum and responds to the roll vibration. The vertical direction, which is the allowable displacement direction of the first spherical joint, substantially coincides with the engine roll direction such that the exhaust pipe is displaced in the vertical direction of the vehicle and the exhaust pipe downstream of the first spherical joint is kept almost stationary. Thus, the roll vibration of the engine can be absorbed in an orderly manner.

[0014] Further, with respect to the axial vibration of the exhaust system, the upstream exhaust pipe and the downstream exhaust pipe connected to the first spherical joint have a first spherical surface in accordance with the vertical component of the axial vibration force. By displacing the joint as a joint in the vertical direction of the vehicle, the axial vibration of the exhaust system can be absorbed. That is, the position where the first spherical joint is provided is a position where the pipe axis faces the direction of the roll center of the engine, in other words, a position where the pipe axis has an inclination angle rising from horizontal to upward. Part of the input is a vehicle vertical component due to the tilt angle.

Further, with respect to the vertical vibration of the exhaust system, the upstream exhaust pipe and the downstream exhaust pipe connected to the first spherical joint move in the vehicle vertical direction with the first spherical joint as a joint in accordance with the vertical vibration input. The displacement can absorb the vertical vibration of the exhaust system.

In addition, since the first spherical joint is provided at a position on the vehicle rear side of the horizontal engine, a front exhaust system in which an exhaust manifold from the engine extends to the vehicle front side in the same vehicle, and an exhaust gas from the engine. It is also possible to easily cope with a case in which a rear exhaust system in which the manifold extends rearward of the vehicle is provided.

According to the second aspect of the present invention, the exhaust pipe is connected to an exhaust manifold disposed on the vehicle front side of the horizontal engine, extends below the exhaust manifold and the horizontal engine, and extends to the rear of the vehicle. It is a forward exhaust system heading toward.

Therefore, the first spherical joint that absorbs both the roll vibration of the engine, the axial vibration of the exhaust system, and the vertical vibration of the exhaust system can be applied to the vehicle of the front exhaust system.

According to the third aspect of the present invention, a second position permitting displacement in the vehicle front-rear direction at a position of an exhaust pipe whose pipe axis is oriented substantially vertically on the vehicle front side of the horizontal engine. A spherical joint is provided.

Therefore, by adopting the first spherical joint and the second spherical joint in the vehicle of the front exhaust system, in addition to the roll vibration of the engine, the axial vibration of the exhaust system, the vertical vibration of the exhaust system, and the front and rear of the exhaust system, Vibration can be absorbed.

According to the fourth aspect of the present invention, the exhaust pipe is connected to an exhaust manifold disposed on the vehicle rear side of the horizontal engine, and the exhaust pipe is directed from the exhaust manifold to the rear of the vehicle. .

Therefore, the first spherical joint that absorbs both the roll vibration of the engine, the axial vibration of the exhaust system, and the vertical vibration of the exhaust system is applied to the vehicle of the rear exhaust system having a small exhaust pipe bending and high exhaust efficiency. be able to.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment for realizing a vehicle engine exhaust system according to the present invention will be described below based on a first embodiment corresponding to claims 1 to 3.

(First Embodiment) First, the configuration will be described. FIG. 1 is a side view showing a vehicle engine exhaust system according to a first embodiment. FIG. 2 is a plan view showing a vehicle engine exhaust system according to the first embodiment. In FIG. 3 is a manifold catalytic converter, 4 is a second
Spherical joint, 5 is a front tube, 6 is a heat shield plate, 7 is a first spherical joint, 8 is a first center tube, 9 is a center muffler, 10 is a second center tube, 11 is a pipe joint,
12 is a rear tube, 13 is a rear muffler, 14 is a tail tube, 15 is a first insulator, 16 is a second insulator, 17 is a third insulator, and 18 is a fourth insulator.

The exhaust manifold 2 is connected to an exhaust manifold 2 disposed on the vehicle front side of the horizontal engine 1.
And a front exhaust system extending below the horizontal engine 1 toward the rear of the vehicle.
And an exhaust system having a three-part structure including first and second center tubes 8 and 10 having a center muffler 9 and a rear tube 12 having a rear muffler 13.

The horizontal engine 1 is mounted at the front of the vehicle in a horizontal arrangement with the crankshaft in the vehicle width direction, and a roll shaft J connecting the vehicle body support points H and I, and a roll center K on the roll shaft J. And

The second spherical joint 4 is a joint for connecting the downstream open end of the manifold catalytic converter 3 and the upstream open end of the front tube 5, and has a tube axis at the vehicle front side of the horizontal engine 1. Is disposed at the position of the upstream opening end of the front tube 5 which is oriented substantially vertically, and allows displacement in the vehicle front-rear direction. That is, as shown in FIG. 3, a flange 4a formed on the outer peripheral portion of the downstream open end of the manifold catalytic converter 3, a flange 4b fixed to the outer peripheral portion of the upstream open end of the front tube 5, and the flange 4a side , A spherical seat 4c formed on the flange 4b, a spherical receiver 4d formed on the flange 4b,
4b connecting the spring 4b via springs 4e and 4f.
g, 4h, and the mounting positions of the bolts 4g, 4h are set at both ends in the vehicle width direction (vehicle left-right direction). Is allowed.

The front tube 5 includes a bent portion 5a, an engine downward extending portion 5b, a kick-up portion 5c, and an inclined portion 5d in order from the upstream side to the downstream side. Are covered by a heat shield plate 6 that blocks heat from the front engine 1. Also,
The inclined portion 5d of the front tube 5 is elastically supported on the vehicle body by the first insulator 15 (FIG. 6).

The first spherical joint 7 is a joint for connecting the downstream open end of the front tube 5 and the upstream open end of the first center tube 8, and has a pipe axis at the vehicle rear side of the horizontal engine. Is the roll center K of the horizontal engine 1
Are arranged at the positions of the front tube 5 and the inclined portions 5d and 8a of the first center tube 8 in the direction of. That is, as shown in FIG.
A flange 7a fixed to the outer periphery of the downstream opening end of the front tube 5, a flange 7b fixed to the outer periphery of the upstream opening end of the center tube 8, a spherical seat 7c provided on the flange 7a side, It has a spherical bearing 7d formed on the flange 7b, and bolts 7g, 7h connecting the flanges 7a, 7b via springs 7e, 7f. The mounting position of the bolts 7g, 7h is determined in the vehicle width direction ( By setting both end positions in the vehicle left-right direction), the spherical seat 7c
A large displacement in the vertical direction of the vehicle is allowed by the relative displacement between the ball and the spherical receiver 7d.

The first center tube 8 has an inclined portion 8a and a horizontal portion 8b in order from the upstream side to the downstream side, and the second center tube 10 is arranged from the upstream side to the downstream side. In order, the horizontal portion 10a and the inclined portion 1
0b, and is elastically supported by the vehicle body by the second insulator 16 (FIG. 7). A center muffler 9 is provided between the downstream open end of the first center tube 8 and the upstream open end of the second center tube 10.

The rear tube 12 has an inclined portion 12a and a horizontal portion 12b in order from the upstream side to the downstream side, and has a downstream open end of the second center tube 10 and an upstream end of the rear tube 12. A pipe joint 11 connecting the side opening end is provided. As shown in FIG. 5, the pipe joint 11 includes a flange 11 a fixed to an outer peripheral portion of a downstream opening end of the second center tube 10, and a rear tube 1.
2 flange 11b fixed to the outer periphery of the upstream opening end
And bolts for fastening and fixing both flanges 11a and 11b.
It is constituted by a nut 11c.

The rear muffler 13 is elastically supported on the vehicle body by a third insulator 17 (FIG. 8) and a fourth insulator 18 (FIG. 9).

Next, the operation will be described.

[Vibration Absorbing Action by Spherical Joint] Of the exhaust pipes extending from the horizontal engine 1 mounted on the front part of the vehicle to the rear part of the vehicle, the pipes are provided on the vehicle rear side of the horizontal engine 1. At the positions of the front tube 5 whose axis is directed toward the roll center K of the engine 1 and the inclined portions 5d and 8a of the first center tube 8, a first spherical joint 7 that allows displacement in the vertical direction of the vehicle is provided. .

Therefore, the roll vibration of the horizontal engine 1 prevents the exhaust pipe connected to the first spherical joint 7
Only the front tube 5 on the engine side is displaced in the vehicle vertical direction in response to the roll vibration with the first spherical joint 7 as a fulcrum, and the first and second center tubes 8, 10 and the like downstream from the first spherical joint 7 When the engine roll direction substantially coincides with the vertical direction, which is the allowable displacement direction of the first spherical joint 7, such that the first spherical joint 7 is kept almost stationary, the roll vibration of the horizontal engine 1 can be absorbed neatly. it can.

Further, with respect to the axial vibration of the exhaust system, the front tube 5 and the first center tube 8 connected to the first spherical joint 7 are connected to the first center tube 8 according to the vehicle vertical component of the axial vibration force. By displacing the spherical joint 7 as a joint in the vertical direction of the vehicle, the axial vibration of the exhaust system can be absorbed. That is, the position at which the first spherical joint 7 is provided is, as shown in FIG.
Since the pipe axis is at a position having an inclination angle θ that rises from horizontal to upward, a part of the axial vibration input becomes a component force in the vehicle vertical direction due to the inclination angle θ.

Further, with respect to the vertical vibration of the exhaust system, the front tube 5 and the first center tube 8 connected to the first spherical joint 7 are connected to the first spherical joint 7 by the first spherical joint 7 in accordance with the vertical vibration input. By displacing in the direction, the vertical vibration of the exhaust system can be absorbed.

On the other hand, of the exhaust pipe extending from the horizontal engine 1 mounted on the front of the vehicle to the rear of the vehicle,
A second spherical joint 4 that allows displacement in the vehicle front-rear direction at a position on the upstream side of the front tube 5 whose pipe axis is oriented substantially vertically on the vehicle front side of the transversely mounted engine 1.
Is provided.

Therefore, with respect to the longitudinal vibration of the exhaust system, the manifold catalytic converter 3 connected to the second spherical joint 4 and the front tube 5 are connected to the second spherical joint 4 in the vehicle longitudinal direction according to the longitudinal vibration input. , The longitudinal vibration of the exhaust system can be absorbed.

Next, the effects will be described.

(1) On the vehicle rear side of the horizontal engine 1,
A front tube 5 and a first center tube 8 whose tube axes are directed toward the roll center K of the horizontal engine 1.
The first spherical joint 7 that allows displacement in the vertical direction of the vehicle is provided at the position of the inclined portions 5d and 8a of the horizontal engine 1
The roll vibration, the axial vibration of the exhaust system, and the vertical vibration of the exhaust system can both be absorbed. In addition, the same vehicle
It can easily cope with a case where a front exhaust system as shown in FIG. 11 and a rear exhaust system as shown in FIG.

(2) A front exhaust system is connected to an exhaust manifold 2 disposed on the vehicle front side of the horizontal engine 1 and extends below the exhaust manifold 2 and the horizontal engine 1 toward the rear of the vehicle. A first spherical joint 7 that absorbs both the roll vibration of the horizontal engine 1, the axial vibration of the exhaust system, and the vertical vibration of the exhaust system in the vehicle of the exhaust system.
Can be applied.

(3) On the vehicle front side of the horizontal engine 1,
The front tube 5 whose pipe axis is oriented almost vertically
A second spherical joint 4 that allows displacement in the vehicle front-rear direction is provided at the position of the opening end on the upstream side of the vehicle. Therefore, by adopting the first spherical joint 7 and the second spherical joint 4 in the vehicle of the front exhaust system, the lateral In addition to the roll vibration of the stationary engine 1, the axial vibration of the exhaust system, the vertical vibration of the exhaust system, the longitudinal vibration of the exhaust system can be absorbed.

(Other Embodiments) The engine exhaust system for a vehicle according to the present invention has been described based on the first embodiment. However, the specific structure is not limited to the first embodiment. Changes and additions to the design are permitted without departing from the spirit of the invention according to each claim of the claims.

For example, in the first embodiment, an example is shown in which the first spherical joint 7 and the second spherical joint 4 are provided in the front exhaust system. However, as shown in FIG. At the rear side of the engine 1 on the vehicle, a vertical position of the front tube 5 and the first center tube 8 whose tube axis is oriented in the direction of the roll center K of the engine 1 allows displacement in the vehicle vertical direction. Only one spherical joint 7 may be provided (corresponding to the invention according to claims 1 and 2). In FIG. 10, reference numeral 19 denotes a pipe joint provided at the position of the second spherical joint 4 in the first embodiment, and reference numeral 20 denotes an underfloor catalytic converter provided upstream of the center muffler 9.

As shown in FIG. 11, in a rear exhaust system which is connected to an exhaust manifold 2 disposed on the vehicle rear side of the horizontal engine 1 and travels from the exhaust manifold 2 directly to the rear of the vehicle, the horizontal engine 1 On the rear side of the vehicle, a first position allowing the vertical displacement of the vehicle at a position of the upstream opening end of the first center tube 8 whose pipe axis faces the direction of the roll center K of the horizontal engine 1.
A spherical joint 7 may be provided (corresponding to the invention according to claim 4).

In this case, the transverse engine 1 is installed in a vehicle having a rear exhaust system with a small exhaust pipe bending and high exhaust efficiency.
The first spherical joint 7 that absorbs both the roll vibration, the axial vibration of the exhaust system, and the vertical vibration of the exhaust system can be applied.

[Brief description of the drawings]

FIG. 1 is a side view showing a vehicle engine exhaust device of a first embodiment.

FIG. 2 is a plan view showing the vehicle engine exhaust system of the first embodiment.

FIG. 3 is a detailed view of a portion A of FIG. 1 showing a second spherical joint of the vehicle engine exhaust system of the first embodiment.

FIG. 4 is a detailed view of a portion B of FIG. 1 showing a first spherical joint of the vehicle engine exhaust device of the first embodiment.

FIG. 5 is a detailed view of a part C in FIG. 1 showing a pipe joint of the vehicle engine exhaust system of the first embodiment.

FIG. 6 is a view in the direction of arrow D in FIG. 2 showing the first insulator of the vehicle engine exhaust system of the first embodiment.

FIG. 7 is a view taken in the direction of an arrow E in FIG. 2 showing a second insulator of the vehicle engine exhaust system of the first embodiment.

FIG. 8 is a view in the direction of arrow F in FIG. 2 showing a third insulator of the vehicle engine exhaust system of the first embodiment.

FIG. 9 is a view in the direction of arrow G in FIG. 2 showing a fourth insulator of the vehicle engine exhaust system of the first embodiment.

FIG. 10 is a side view showing another example of the vehicle engine exhaust device using the front exhaust system.

FIG. 11 is a side view showing an example of a vehicle engine exhaust device using a rear exhaust system.

[Explanation of symbols]

 Reference Signs List 1 horizontal engine 2 exhaust manifold 3 manifold catalytic converter 4 second spherical joint 5 front tube 6 heat shield plate 7 first spherical joint 8 first center tube 9 center muffler 10 second center tube 11 pipe fitting 12 rear tube 13 rear muffler 14 Tail tube 15 First insulator 16 Second insulator 17 Third insulator 18 Fourth insulator K Roll center of horizontal engine 1

Continued on the front page F term (reference) 3D038 BA02 BB01 BC20 3G004 AA01 BA04 BA06 DA00 DA01 DA06 DA11 DA12 DA13 EA03 EA05 3H104 JA03 JB01 JC08 JD03 LA03 LG07 LG30 MA08

Claims (4)

[Claims] 1. An exhaust pipe extending from a horizontal engine mounted on a front part of a vehicle to a rear part of the vehicle, a muffler provided at an intermediate position of the exhaust pipe, and these exhaust system members are supported by a vehicle body. An exhaust system for a vehicle, comprising: an insulator that allows a displacement in a vehicle vertical direction at a position of an exhaust pipe whose pipe axis is directed to a roll center direction of the engine on a vehicle rear side of the horizontal engine. An engine exhaust system for a vehicle, comprising a first spherical joint. 2. The vehicle engine exhaust system according to claim 1, wherein the exhaust pipe is connected to an exhaust manifold disposed on a vehicle front side of the horizontal engine and extends below the exhaust manifold and the horizontal engine. An exhaust system for a vehicle, wherein the exhaust system is a front exhaust system that is directed toward the rear of the vehicle. 3. The vehicle engine exhaust system according to claim 2, wherein a longitudinal axis of the horizontal engine is displaced in a front-rear direction of the vehicle at a position of an exhaust pipe whose pipe axis is oriented substantially vertically. An engine exhaust system for a vehicle, comprising a second spherical joint that allows the following. 4. The exhaust system for a vehicle engine according to claim 1, wherein the exhaust pipe is connected to an exhaust manifold disposed on the vehicle rear side of the horizontal engine, and the rear exhaust gas from the exhaust manifold toward the rear of the vehicle as it is. An engine exhaust device for a vehicle, which is a system.