JPH06227269A - Exhaust system installing structure of car - Google Patents

Abstract

PURPOSE:To make layout of exhaust pipe properly without bringing about such a problem that the buffer device of a suspension comes into contact. CONSTITUTION:A car is so structured that a buffer device, for example an oil damper 7, of a suspension for bearing a car body on wheels 2L, 2R is installed across the car width, wherein a pivoting part (pin 39) to pivot the buffer device swingably is installed on the car body side member consisting of a suspension cross-member 4 etc., and an exhaust pipe 37 is arranged in the neighborhood of this pivoting part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust system arrangement structure for a vehicle in which a suspension shock absorber for suspending wheels on a vehicle body is installed in the vehicle width direction.

[0002]

2. Description of the Related Art Conventionally, various types of vehicle suspension devices, such as strut suspensions, double wishbone suspensions, and multi-link suspensions, have been put into practical use. However, each of the above-mentioned conventional suspension devices has a large vehicle height and requires a large installation space, so that it is unavoidable that the cabin space becomes narrow.

In order to solve the problem that the suspension tower protrudes into the cabin in consideration of the demand for widening the interior of the cabin, for example, JP-A-64-41408.
As disclosed in the publication, it is considered to lay out a pair of shock absorbers in which a coil spring and a hydraulic damper are coaxially arranged in the suspension cross member (subframe) in the vehicle width direction.

[0004]

When the suspension in which the shock absorber is installed in the vehicle width direction as described above is used for the rear wheels, the exhaust pipe installed so as to extend in the front-rear direction of the vehicle body. It is necessary to lay out so as to avoid the interference of. That is, since the oil damper and the like constituting the shock absorber are oscillated and displaced according to the bumps, rebounds, etc. of the wheel, it is difficult to dispose the exhaust pipe with an appropriate clearance so as not to abut against the bumper or rebound. There was a problem.

The present invention has been made in order to solve the above problems, and an exhaust system layout of a vehicle in which an exhaust pipe can be properly laid out without causing a problem that a shock absorber of a suspension comes into contact with the suspension system. The purpose is to provide an installation structure.

[0006]

According to a first aspect of the present invention, in a vehicle in which a suspension shock absorber for suspending wheels on a vehicle body is installed in a vehicle width direction, the shock absorber is rocked on a vehicle body side member. In addition to providing a pivotally supporting portion that freely pivots, an exhaust pipe is arranged near this pivotally supporting portion.

According to the second aspect of the present invention, the exhaust pipe is arranged above the installation portion of the damper which constitutes the shock absorber of the suspension.

According to a third aspect of the present invention, the exhaust pipe is provided with a step portion that extends downward behind the installation portion of the damper that constitutes the shock absorber of the suspension.

[0009]

According to the present invention as set forth in claim 1, the exhaust pipe is installed in the vicinity of the pivotal support portion of the shock absorber provided on the vehicle body side member and having the least amount of movement. Buffering with the exhaust pipe is easily and surely avoided.

According to the second aspect of the present invention, the damper of the suspension made of a rigid body is arranged below the installation portion of the exhaust pipe, and the exhaust pipe is protected by this damper.

According to the third aspect of the present invention, when an impact load is applied to the rear end portion of the exhaust pipe at the time of a rear-end collision of the vehicle, the exhaust pipe is concentrated on the step portion provided behind the installation portion of the damper. After being mechanically deformed, the stepped portion is pushed forward and comes into contact with the damper.

[0012]

1 and 2 show an embodiment of a vehicle suspension device according to the present invention. This vehicle suspension device has a pair of left and right side frames 1 forming a part of a vehicle body. Left and right rear wheels 2L, 2R are arranged outside the both side frames 1, and a suspension cross extending below the side frames 1 in the vehicle width direction via a pair of left and right bending members 3. Member 4 is installed.

A mount member 5 is arranged between the suspension cross member 4 and the bending member 3.
Due to the cushioning effect of the mount member 5,
The suspension cross member 4 is elastically supported by the side frame 1.

The suspension device is a multi-link type suspension device having a leaf spring 6 as a suspension spring, a pair of left and right oil dampers 7, a rotary roll damper (rotary damper) 8 also serving as a stabilizer, and the like. . Then, the leaf spring 6, the oil damper 7, and the roll damper 8 constitute a shock absorber that absorbs an impact input from the rear wheels 2L, 2R.

The leaf spring 6 is a leaf spring made of fiber reinforced synthetic resin or metal, and is arranged at the rear of the suspension cross member 4, and is supported by the suspension cross member 4 by a pair of left and right holding members 9. There is. The left and right ends of the leaf spring 6 are connected to the arm 12 of the wheel support 11 via the control links 10, and are rotatably supported with pins in the front-rear direction as fulcrums.

The left and right oil dampers 7 are horizontally and symmetrically arranged at a position in front of the suspension cross member 4, with the damper body 13 facing the outside of the vehicle body and the operating rod 14 facing the inside of the vehicle body. is set up. The end portion of the operating rod 14 of each of the oil dampers 7 is
Support portion 38 provided on the suspension cross member 4
Is pivotally supported by a pin 39 in the front-rear direction. Also,
The end of the damper body 13 is supported by being connected to the wheel support 11 via the control link 15.

The control link 15 is in the shape of a right triangle, and the inner end of the control link 15 is pivotally attached to the bracket 17 of the side frame 1 via a pin in the front-rear direction, so that the control link 15 is swingably supported in the vertical plane. Has been done. When the left and right rear wheels 2 and 3 are bumped and rebound, the control link 15 is oscillated and the load is input to the oil damper 7, and the oil damper 7 exerts a vibration suppressing effect. .

As shown in FIG. 3, the roll damper 8 includes a case 18, which is rotatably held by the suspension cross member 4.
The torsion rod 19 is provided at the center of the case 18.
And a torsion sleeve 20 fitted to the torsion rod 19 so as to be rotatable relative to each other. A damper sleeve 21 is rotatably fitted on the torsion sleeve 20, and the damper sleeve 21 also covers the case 18.
Has been inserted inside.

On the front end side of the case 18, a connecting sleeve 22 shorter than the damper sleeve 21 is fitted on the damper sleeve 21 so as to be rotatable relative thereto.
It is fixed to the front end of the inside. The rear end of the torsion rod 19 and the rear end of the torsion sleeve 20 are joined to the connecting plate 23 by means of welding or the like. The torsion rod 19 and the torsion sleeve 20 form a torsion bar of a stabilizer. It is configured.

In the case 18, a plurality of inner disks 24 and a plurality of outer disks 25 are alternately arranged in a state of being close to each other, and the inner disks 24 are provided on the outer peripheral surface of the damper sleeve 21. Are fixed to the inner peripheral surface of the case 18, respectively. Highly viscous oil is filled in the case 18, and the relative rotation of the inner disk 24 and the outer disk 25 is suppressed by the viscosity of this oil.

The damper sleeve 21 is the connecting sleeve 2.
2, the torsion sleeve 20 extends outside the front end of the damper sleeve 21. Further, the torsion rod 19 extends outside the front end of the torsion sleeve 20. A first lever 26 is fixed to the front end of the torsion rod 19, and a second lever 27 is fixed to the front end of the connecting sleeve 22.
The tip ends of both levers 26 and 27 are connected to the connecting rod 28.
Is connected to the damper main body 13 of the left oil damper 7.

A third lever 29 is fixed to the front end of the torsion sleeve 20, and a fourth lever 30 is fixed to the front end of the damper sleeve 21.
The tip ends of both levers 29 and 30 are connected to the connecting rod 31.
Is connected to the damper body 13 of the oil damper 7 on the right side.

This suspension device is provided with an upper arm 32, a lower arm 33, an upper trailing link 34, and a lower trailing link (not shown), similar to a general suspension device. The inner ends of the upper arm 32 and the lower arm 33 are connected to the suspension cross member 4 via pivotal supports, and the outer ends of both arms 32.33 are connected to the wheel support 11 via ball joints.

The upper trailing link 3 is also used.
4 and the front ends of the lower trailing links are connected to the side frame 1 via pivotal supports, and the rear ends of both links are connected to the wheel support 11 via ball joints. In FIG. 1, the line KP is the kingpin axis.

The side surface of the front frame 1 is shown in FIG.
As shown in FIG. 2, when the rear wheels 2L, 2R are bumped, the bump stoppers 35 that restrict the swing displacement of the wheel support 11 are attached to the lower surface by contacting the control links 15 and limiting the rising range thereof. The bracket 36 is projected.

On the right side of the roll damper 8,
An exhaust pipe 37 extending in the front-rear direction of the vehicle body is installed.
As shown in FIG. 4, the exhaust pipe 37 penetrates through the through hole 41 formed in the front wall plate 40 of the suspension cross member 4 and is introduced into the suspension cross member 4 to form the oil damper 7 including the pin 39. It is arranged near the upper part of the pivotal support. Further, the exhaust pipe 37 has a step portion 42 that is bent so as to extend downward at the rear portion of the pivot portion of the oil damper 7, and passes from the lower end portion of the step portion 42 below the installation portion of the leaf spring 6. It is led to the rear side of the vehicle body.

In the suspension device having the above structure, the rear wheel 2L,
2R bumps and shocks during rebound are buffered,
The left and right oil dampers 7 suppress bumps and rebounds of the rear wheels 2L and 2R (that is, changes in the vertical displacement of the rear wheels).

Further, by the stabilizer action of the torsion rod 19 and the torsion sleeve 20 of the rotary type roll damper 8 which also functions as the stabilizer, the roll of the vehicle body is suppressed and the relative rotation of the inner and outer disks 24, 25 is made inside the case 18. The roll of the vehicle body is also suppressed by being regulated by the viscosity of the oil.

In the suspension device having the above structure, since the shock absorbers each including the leaf spring 6 and the pair of left and right oil dampers 7 are installed in the vehicle width direction, the vertical installation size of the shock absorbers can be reduced. Therefore, the overall height of the suspension device can be reduced to achieve a low floor and the space of the luggage compartment and the passenger compartment can be set large.

Then, as described above, the exhaust pipe 3 is provided in the vicinity of the pin 39 which serves as a pivotal support portion for the vehicle body side member (suspension cross member 4) of the shock absorber composed of the oil damper 7.
Since 7 is provided, the exhaust pipe 37 is installed in the portion of the oil damper 7 where the movement amount is the smallest. Therefore, it is possible to reliably prevent the interference between the exhaust pipe 37 and the oil damper 7 by reducing the distance between the installation portions.

Further, in the above-described embodiment, since the exhaust pipe 37 is installed above the installation portion of the oil damper 7 made of a rigid body, the exhaust pipe 37 is installed in the oil damper 7 when traveling on a bad road.
Can be protected and its damage can be reliably prevented.

Further, as shown in the above embodiment, when the exhaust pipe 37 is formed with the step portion 42 extending downward behind the installation portion of the oil damper 7, the installation portion of the leaf spring 6 is bypassed. Thus, the exhaust pipe 37 can be disposed, and it is possible to effectively prevent the impact load applied at the time of a rear collision of the vehicle from reaching the installation portion of the engine or the like.

That is, at the time of a rear collision of the vehicle, the exhaust pipe 37
When an impact load is input to the rear end portion, stress is concentrated on the step portion 42 and this portion is deformed, so that the impact load is absorbed. When a larger load is input to the rear end of the exhaust pipe 37, the step 42
Is pushed forward and comes into contact with the oil damper 7. As a result, the forward movement of the exhaust pipe 37 is blocked by the oil damper 7, and it is possible to prevent the impact load from being applied to the engine installation portion and the like (not shown).

[0034]

As described above, according to the present invention, in a vehicle in which a shock absorber for a suspension including an oil damper and the like is installed in the vehicle width direction, an exhaust pipe is provided in the vicinity of a pivotal support portion for the vehicle body side member of the shock absorber. Since it is arranged, the exhaust pipe is installed in the portion of the shock absorber where the movement amount is the smallest, and it is possible to reliably prevent the interference between the exhaust pipe and the shock absorber by reducing the interval between the installation parts.

Further, when the exhaust pipe is installed above the installation portion of the damper made of a rigid body, the exhaust pipe is prevented from being interfered with by the damper when traveling on a bad road while preventing the interference between the exhaust pipe and the damper. There is an advantage that it can be protected and its damage can be surely prevented.

Further, according to the construction in which the step portion extending downward is formed behind the damper installation portion in the exhaust pipe,
The impact load can be absorbed by intensively deforming the stepped portion in accordance with the impact load applied at the time of a rear collision of the vehicle. Further, when a larger impact load is applied and the step portion of the exhaust pipe is pushed forward, the step portion comes into contact with the damper and is prevented from moving further forward. Therefore, there is an advantage that the impact load at the time of a rear impact can be effectively prevented from reaching the engine installation portion and the like.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a vehicle suspension device according to the present invention.

FIG. 2 is a plan view of the suspension device.

FIG. 3 is a plan sectional view of a roll damper provided in the suspension device.

FIG. 4 is a side sectional view showing a configuration of an installation portion of an exhaust pipe.

[Explanation of symbols]

 4 Suspension Cross Member (Vehicle Side Member) 7 Oil Damper (Cushioning Device) 37 Exhaust Pipe 39 Pin (Pivot Support) 42 Step

Claims (3)

[Claims] 1. In a vehicle in which a suspension shock absorber for suspending wheels on a vehicle body is installed in a vehicle width direction, a vehicle body side member is provided with a pivot support portion for swingably pivoting the shock absorber, and An exhaust system disposition structure for a vehicle, characterized in that an exhaust pipe is disposed in the vicinity of the support. 2. The exhaust system disposition structure for a vehicle according to claim 1, wherein an exhaust pipe is disposed above an installation portion of a damper forming a shock absorber of the suspension. 3. The exhaust system disposition structure for a vehicle according to claim 1, wherein a step portion that extends downwardly behind the installation portion of the damper that constitutes the suspension shock absorber is provided in the exhaust pipe.