JPH0986193A - Automotive rear part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the clash characteristic of a vehicular rear part by reducing the interference of a silencer with clashing in the vehicular rear part during rear surface clashing when the rear overhung of a vehicle is made as short as possible in an automotive rear part structure having a double wish-bone type rear suspension. SOLUTION: A silencer 14 is provided so as to be extended in the back and forth directions of a vehicle in the rear side position of a rear suspension 5 and arranged in a position so as to be inserted into a front space S plotted by four members, a lower arm 5, an upper arm 6, a suspension attaching member 4 and a rear wheel 8, in upper and lower directions and a car width direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear structure of a motor vehicle, and more particularly, to an improved arrangement of silencers in an exhaust system.

[0002]

2. Description of the Related Art Generally, as a rear structure of an automobile equipped with a double wishbone type rear suspension,
For example, the one described in JP-A-5-85416 is known. This is a dual silencer type in which a silencer is arranged behind each rear suspension in order to shorten the rear overhang of the vehicle, and each silencer is provided so as to extend approximately in the vehicle front-rear direction. There is.

By the way, in the case of a rear collision of an automobile, it is desirable that the rear portion of the vehicle can be sufficiently crashed in order to ensure the safety of passengers in the passenger compartment. At that time, if the silencer is arranged so as to extend in the vehicle front-rear direction when the rear overhang of the vehicle is short, the silencer functions as a rigid body, and in some cases, a crash at the rear of the vehicle is prevented by the silencer. Therefore, it becomes difficult to sufficiently crash the rear part of the vehicle.

On the other hand, in the above-mentioned publication, the front end of each silencer is positioned at a position in the vehicle front-rear direction in which the rear wheel partially overlaps with the rear wheel in the vehicle widthwise direction. This is disclosed in the drawings. Therefore, in this conventional example, when each silencer is pushed forward from the rear side during a rear-end collision of a vehicle, its front end portion can move forward without contacting the rear wheel, and its forward movement amount Only the rear part of the vehicle can be crashed.

[0005]

However, in the above-mentioned conventional example, even though it is possible to avoid the silencer from contacting the rear wheel at the time of a rear surface collision of the vehicle, the silencer may contact the suspension of the rear wheel. Therefore, there is still room for improvement in the crash characteristics of the rear part of the vehicle. In particular, when the suspension is a double wishbone type having a lower arm and an upper arm as in the above-mentioned conventional example, there is also a situation in which the silencer is likely to come into contact with the suspension.

The present invention has been made in view of the above points, and its main purpose is to reduce the rear overhang as much as possible in the rear structure of an automobile having a double wishbone type rear suspension. By modifying the placement of the silencer, it is possible to further reduce the degree to which the above-mentioned silencer prevents a crash at the rear part of the vehicle at the time of a rear-end collision, thus further improving the crash characteristics at the rear part of the vehicle. To do.

[0007]

In order to achieve the above object, in the invention of claim 1, the silencer at the time of a rear collision of an automobile is provided with four silencers, a lower arm of a rear suspension, an upper arm, a suspension mounting member and a rear wheel. The member is fitted into the front space defined by the partition, whereby the amount of forward movement of the silencer can be increased and the extent to which a crash of the vehicle rear portion is prevented by the silencer can be reduced.

Specifically, the present invention is premised on the rear structure of an automobile provided with a double wishbone type rear suspension for supporting the rear wheels via lower arms and upper arms pivotally mounted to suspension mounting members, respectively. I am trying.

At least one exhaust pipe is arranged such that its downstream end is located behind the suspension in the vehicle front-rear direction, and is connected to the downstream end of the exhaust pipe, and the vehicle is located behind the suspension. And a silencer provided so as to extend in the front-rear direction. Then, the silencer is placed in a front space defined by the lower arm, upper arm, suspension mounting member, and rear wheel of the rear suspension in the vertical direction and the vehicle width direction so that the silencer can be fitted into the front space at the time of a rear collision of the vehicle. It will be arranged.

In the above structure, when the rear part of the vehicle crashes at the time of rear collision of the automobile, the silencer is pushed from the rear side and tries to move forward. At this time, the silencer can be fitted into the front space defined by the lower arm, the upper arm, the suspension mounting member and the rear wheel of the rear suspension located in front of the silencer in the vertical direction and the vehicle width direction. The silencer can be moved forward by the amount of insertion. Therefore, the degree to which the rear part of the vehicle crashes is hindered by the silencer is reduced, and the rear part of the vehicle can be improved in crash characteristics.

According to the invention of claim 2, in the invention of claim 1, the downstream end portion of the exhaust pipe is provided so as to extend rearward after being routed so as to pass between the lower arm and the upper arm of the rear suspension. I will.

In the above structure, when the silencer is pushed from the rear and moves forward, the silencer moves forward while deforming the exhaust pipe. At this time, the exhaust pipe is deformed so as to move between the lower arm and the upper arm of the rear suspension toward the vehicle front side, whereby the vehicle front side portion of the silencer is guided into the front space, and therefore, the front portion of the silencer. Fitting into the space is facilitated. Further, when connecting the downstream end of the exhaust pipe to the front end of the silencer, as compared with the case where the downstream end portion of the exhaust pipe bypasses the rear suspension and is bent toward the silencer immediately before the silencer, The exhaust pipe can be easily handled.
Therefore, it is easy to deal with the shortening of the rear overhang.

In the invention of claim 3, the above-mentioned claim 1 or 2
In the invention described above, when there are two exhaust pipes, the silencers connected to the respective exhaust pipes are arranged on both sides of the vehicle so as to face each other in a state substantially parallel to each other. Then, the rear floor portion of the vehicle is arranged between the silencers.

In the above structure, the rear floor portion of the vehicle is arranged between both silencers located on both sides of the vehicle, so that the vehicle rear surface can face the ground contact surface of the vehicle without interposing the silencers. Therefore, the height position of the rear floor portion can be lowered by the amount that the silencer does not intervene. Therefore, when the rear floor portion is a trunk room floor, the trunk room can be made deep and its capacity can be increased.

According to a fourth aspect of the present invention, in the above-mentioned first to third aspects, the lower surface of the rear floor portion of the vehicle is provided so as to be inclined rearward and obliquely upward so as to be smoothly connected to the lower side portion of the rear bumper. To do so. Then, below the rear floor portion, a wing member that receives a vehicle traveling wind flowing along the lower surface of the rear floor portion and generates a downward pressing force is provided so as to extend in the vehicle width direction.

In the above structure, the vehicle running wind flows along the lower surface of the vehicle rear floor portion after passing between the two rear suspensions. At this time, the wing member generates a downward pressing force by receiving the vehicle running wind.
As a result, the ground contact force of the rear wheels is increased and the steering stability is improved.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. 2 and 3 show the overall structure of the rear structure of a vehicle according to an embodiment of the present invention. The vehicle is mounted on the front side (the upper side of FIG. 2 and the left side of FIG. 3) of the vehicle. The rear wheels 8 and 8 are driven by an external engine.

Each of the above-mentioned automobiles has a front-rear direction (see FIG. 2).
Of the pair of side frames 1 and 1 extending in the vertical direction of FIG. 3 and the left and right direction of FIG. 3, respectively. ), Two rear cross members 2 and 3 provided so as to extend in the vehicle width direction (the left-right direction in FIG. 2) are arranged so as to be displaced in the vehicle front-rear direction. A rear suspension mounting member 4 is arranged and fixed on the lower surface of a portion formed by the side frames 1, 1 and the rear cross members 2, 3 into a rectangular frame shape. A fuel tank T for accommodating automobile fuel is arranged on the upper surface side of the suspension mounting member 4.

A double wishbone type rear suspension 5 having a lower arm 6 and an upper arm 7 is attached to both sides of the suspension attaching member 4 in the vehicle width direction. The lower arm 6 and the upper arm 7 are respectively provided at two pivotal support portions 6a, 6a, 7a, 7
In a, the suspension mounting member 4 is swingably supported about an axis extending in the vehicle front-rear direction, while not shown in the drawings, but on the swing end side of each arm 6 and 7 via each ball joint. The wheel supporting members are swingably connected to each other. Between the lower arm 6 and the side frame 1, a damper 9 which is unitized with the compression coil spring 9a is provided. Here, the damper 9 is arranged behind a drive shaft described later. A rear wheel 8 is rotatably attached to the wheel support member via a wheel bearing (not shown).

A center frame 10 is provided between the side frames 1 and 1 so as to extend in the vehicle front-rear direction. Below the center frame 10, although not shown, the transmission for the engine is provided. A propeller shaft drive-connected via the is arranged.
The rear end of the propeller shaft is connected to the final reduction gear unit 11 supported and fixed to the suspension mounting member 4. The final deceleration unit 11 has a built-in differential device, and is configured to drive the rear wheels 8 via the drive shafts 12 and 12, respectively.

Below the propeller shaft,
Two exhaust pipes 13, 13 each communicating with the exhaust port of the engine for discharging exhaust gas to the outside are arranged so as to extend in the vehicle front-rear direction while being adjacent to each other in the vehicle width direction. The downstream portion of each exhaust pipe 13 is bent at a position immediately before the final deceleration portion 11 and extends obliquely rearward so as to be separated from each other on both sides, and then, between the lower arm 6 and the upper arm 7 of the rear suspension 5, respectively. It is provided to extend rearward after being routed through. Specifically, the rear suspension 5
Is bent again at a position below the lower arm 6, extends obliquely upward so as to pass between both pivotal support portions 6a, 6a of the lower arm 6, and is further bent at a substantially intermediate position between the lower arm 6 and the upper arm 7. It is being routed and then extends straight back.
A silencer 14 is connected to the downstream ends of the exhaust pipes 13, respectively.

The silencers 14 are symmetrically arranged on both sides of the vehicle. As shown in FIG. 1 for the silencer 14 on the right side of the vehicle, the rear suspension 5 is provided.
The lower arm 6, the upper arm 7, the suspension mounting member 4, and the rear wheel 8 are formed so as to have a cylindrical shape having a size that can be fitted into the front space S defined by the four members and extend in the vehicle front-rear direction. . Further, it is arranged between the lower arm 6 and the upper arm 7 in the vertical direction, and between the suspension mounting member 4 and the rear wheel 8 in the vehicle width direction. An exhaust pipe end 14a is connected to the rear end of each silencer 14 so as to project rearward. Note that the silencer 14 on the left side of the vehicle is the same as the above except that the position and shape in the vehicle width direction are reversed, and therefore description thereof is omitted.

Between the silencers 14 and 14, the floor 15 of the trunk 15 as a vehicle rear floor is provided.
a is arranged in a depressed state. Further, although not shown, an insulator that blocks heat radiation from the silencer 14 is vertically provided between the trunk room 15 and each silencer 14.

As shown in FIG. 4, the lower surface of the trunk room floor 15a is provided so as to be inclined rearward and obliquely upward so as to be smoothly connected to the lower side portion of the rear bumper 16, and the trunk room floor 15a has a lower surface. Two wing members 17 and 18 are provided below the front and rear wing members 17 and 18 respectively, each of which receives a vehicle traveling wind flowing along the lower surface of the floor 15a and generates a downward pressing force. The wing members 17 and 18 are supported by the insulator at both ends thereof. That is, a rear floor wing 17 is provided on the front side, and a rear underwing 18 having a front-rear length longer than the rear floor wing 17 is provided on the rear side at intervals in the vehicle front-rear direction, and the suction surfaces face downward. It is arranged in a state. Both wings 17 and 18 are arranged substantially parallel to the lower surface of the floor 15a, but are offset from each other with respect to the running wind of the vehicle. That is, the rear floor wing 17 is arranged near the floor 15a, and the rear underwing 18 is arranged apart therefrom. And both wings 17, 18
A tie-down hook 19 is vertically provided so as to project downward from a gap therebetween, and an upper end of the tie-down hook 19 is fixed to the side frame 1.

Floor 15a in the trunk room 15
The upper portion of the spare tire 2 is inclined substantially along the upper surface thereof and is substantially in contact with the front wall portion 15b of the trunk room 15.
0 is arranged. That is, when the rear portion of the spare tire 20 is pushed forward in a rear-end collision of an automobile, the spare tire 20 is erected as shown by a phantom line in FIG. The spare tire 20 prevents the rear crash of the vehicle from being hindered during a rear-end collision. The spare tire 20 is held on the floor 15a by a bracket 21 having a collapse function.

That is, while the bracket 21 normally holds the spare tire 20 with sufficient holding rigidity,
At the time of a rear-end collision, the spare tire 20 is bent and formed in a contracted state so as to be able to extend following the above-mentioned standing operation. Specifically, the bracket 21 is formed by bending a strip-shaped metal plate at a plurality of positions in the longitudinal direction, and the both ends in the longitudinal direction are displaced in the vehicle longitudinal direction. It is fixed to the floor 15a at the part. An insertion hole for the mounting screw 22 is provided at a position slightly forward of the center in the longitudinal direction, and a nut 21a to which the mounting screw 22 can be screwed is welded to the lower surface thereof. On the other hand, the front portion 21b and the rear portion 21c of the nut 21a are each bent at a plurality of points in the middle. As a result, when the spare tire 20 stands up at the time of a rear-end collision, the front portion 21b and the rear portion 21c of the bracket 21 are each extended in a substantially straight state as shown by phantom lines in FIG. There is. When the fuel tank T is arranged above the spare tire 20 in the trunk room 15 and the fuel tank is not arranged in front of the spare tire 20 as in the present embodiment, the trunk room 15 is not provided. The front wall portion 15b may be formed of, for example, a material having low strength, and the front tire portion 15b may be pierced by the spare tire 20 in the case of a rear-end collision of an automobile so that it can move forward.

Further, as shown in FIG. 5, one license lamp for illuminating a license plate 24 arranged above the rear bumper 16 is provided at the center of the rear end surface of the trunk lid 23 which covers the trunk room 15 so as to be opened and closed. 25 are arranged. This is because unlike the case where the license plate 24 is illuminated from both sides thereof, only one license lamp 25 is required, and the place where the license lamp 25 is installed is different from the case where the license plate 25 is illuminated from the upper surface of the rear bumper 16. This is because it is inconspicuous and looks good.

That is, the license plate 24 is
The upper side of the trunk lid 23 is arranged in a state of being tilted to the front side in the vehicle front-rear direction, while the rear end surface of the trunk lid 23 is inclined obliquely downward toward the front in the vehicle front-rear direction so that the entire surface of the license plate 24 can be seen from above. It is like this. An opening is formed in the center of the rear end surface of the trunk lid 23, and a lamp holder 26 for detachably holding the license lamp 25 is provided in the opening. In the figure, 27 is the lamp holder 2 described above.
A rear finisher made of a transparent resin that covers 6 from the rear in the vehicle front-rear direction, and 28 indicates the rear finisher 27 on the side of the trunk lid 23 and the trunk lid reinforcement 29.
It is a screw that is fixed to each side. Further, since the license lamp 25 is located rearward, the illumination angle with respect to the license plate 24 can be increased.
When an extension such as a rear spoiler is provided at the rear end of the trunk lid, it may be provided on the extension. Further, the rear end portion of the trunk lid 23 may be made of a relatively soft material separate from the trunk lid 23.

Therefore, according to the present embodiment, in the rear structure of the vehicle equipped with the double wishbone type rear suspension, the rear part of the vehicle crashes at the time of a rear surface collision and the silencers 14, 14 are pushed from the rear to the front. When attempting to move, as shown by phantom lines in FIG. 3, each silencer 14 is divided into four parts, that is, a lower arm 6, an upper arm 7, a suspension mounting member 4 and a rear wheel 8 of the rear suspension 5 to form a front space. S
The silencer 14 can be moved forward by the amount of the insertion. Therefore,
Even if the rear overhang of the vehicle is short, it is possible to reduce the degree to which the above-mentioned crash is hindered by the silencer 14, and improve the crash characteristics of the rear portion of the vehicle.

At this time, with the forward movement of the silencer 14, the downstream end portion of the exhaust pipe 13 can be deformed so as to move between the lower arm 6 and the upper arm 7 of the rear suspension 5 toward the vehicle front side. As a result, the silencer 14 can be guided into the front space S and smoothly fitted into the front space S. Further, when connecting the downstream end of the exhaust pipe 13 to the front end of the silencer 14, for example, the downstream end portion of the exhaust pipe is bypassed to the rear suspension and bent toward the silencer immediately before the silencer. As compared with the case, the exhaust pipe 14 can be easily routed, and therefore, the rear overhang can be easily shortened.

In addition, the floor 1 of the above-mentioned trunk room 15
Since the 5a is arranged between the silencers 14 and 14, the height position of the floor 15a can be lowered without being disturbed by the silencers 14 and 14, so that even when the rear overhang of the vehicle is short. It is possible to make the trunk room 15 deep and increase its capacity.

On the other hand, floor 1 of the above-mentioned trunk room 15
Since 5a is inclined obliquely upward toward the rear and wings 17 and 18 are arranged below the floor 15a, downforce is obtained by the traveling wind flowing along the lower surface of the floor 15a as the vehicle travels. be able to.
At this time, since the two wings 17, 18 are arranged in front and back with a space therebetween and are offset from each other with respect to the traveling wind, the downforce can be efficiently obtained. As a result, the ground contact force of the rear wheels 8 and 8 can be efficiently increased to improve the steering stability.

Although the damper 9 of the rear suspension 4 is arranged on the rear side of the drive shaft 12 in the vehicle front-rear direction in the above embodiment, it may be arranged on the vehicle front side of the drive shaft 12. In this case, the silencer 14 is connected to the drive shaft 1 at the time of rear collision of the automobile.
It can be moved forward to the position where it abuts 2.

[0034]

As described above, according to the first aspect of the invention, the double wishbone type rear suspension is provided, which supports the rear wheels via the lower arm and the upper arm pivotally attached to the suspension mounting member. In the rear structure of the automobile, at least one exhaust pipe arranged so that the downstream end thereof is located behind the suspension in the vehicle front-rear direction, and the exhaust pipe connected to the downstream end of the exhaust pipe are provided behind the suspension. A silencer provided so as to extend in the vehicle front-rear direction is provided, and the silencer is provided in the vertical direction and the vehicle width direction by four members of a rear suspension lower arm, an upper arm, a suspension mounting member, and a rear wheel. Arrange it in a position where it can be fitted into the compartmented front space. Therefore, it is possible to fit the silencer into the front space at the time of a rear-end collision of an automobile to increase the amount of forward movement thereof.Therefore, even when the rear overhang of the vehicle is short, the silencer can prevent the collision from occurring. It is possible to improve the crash characteristic of the rear part of the vehicle by suppressing it to a small value.

According to the invention of claim 2, the downstream end portion of the exhaust pipe is provided so as to extend rearward after being routed so as to pass between the lower arm and the upper arm of the rear suspension. Therefore, it is possible not only to smoothly fit the silencer into the front space at the time of a rear collision of the vehicle, but also to facilitate the handling of the exhaust pipe even when the vehicle overhang is short.

According to the third aspect of the invention, when the number of the exhaust pipes is two, the exhaust pipes are arranged so as to extend in the vehicle front-rear direction through between the lower arm and the upper arm of each rear suspension. Since the rear floor portion of the vehicle is arranged between the silencers of the two exhaust pipes, the height position of the rear floor portion can be lowered without being disturbed by the silencer. As a result, when the rear floor portion is a trunk room floor, the trunk room can be deepened and its capacity can be increased even if the vehicle overhang is short.

According to the invention of claim 4, the lower surface of the rear floor portion of the vehicle is provided so as to be inclined rearward and obliquely upward so as to be smoothly connected to the lower side portion of the rear bumper,
In addition, since a wing member that generates a downward pressing force in response to the vehicle traveling wind that flows along the lower surface of the rear floor portion is provided below the rear floor portion, the ground contact force of the rear wheels is increased. It is possible to improve steering stability.

[Brief description of drawings]

FIG. 1 is a front view showing the arrangement and shape of a silencer on the right side of a vehicle in a rear structure of an automobile according to an embodiment of the present invention, as viewed from the vehicle rear side.

FIG. 2 is a plan view showing a rear structure.

FIG. 3 is a side view showing a rear structure.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is an enlarged vertical sectional view showing a rear end portion of an automobile.

[Explanation of symbols]

 4 Suspension mounting member 5 Rear suspension 6 Lower arm 7 Upper arm 8 Rear wheel 13 Exhaust pipe 14 Silencer 15a Trunk room floor (vehicle rear floor part) 16 Rear bumper 17 Rear floor wing (wing member) 18 Rear underwing (wing member) S Front space

Claims (4)

[Claims] 1. A rear structure of an automobile, comprising a double wishbone type rear suspension for supporting a rear wheel via a lower arm and an upper arm pivotally attached to a suspension mounting member, respectively, the downstream end of which is the front and rear of the vehicle. At least one exhaust pipe arranged so as to be located behind the suspension in the direction, and a silencer connected to the downstream end of the exhaust pipe and provided so as to extend in the vehicle front-rear direction behind the suspension. The silencer is the lower arm of the rear suspension,
A rear structure of a vehicle, which is arranged in a front space defined by four members of an upper arm, a suspension mounting member, and a rear wheel in a vertical direction and a vehicle width direction at a position that can be fitted in a rear surface collision of the vehicle. . 2. The rear structure of the automobile according to claim 1, wherein the downstream end portion of the exhaust pipe is provided so as to extend rearward after being routed so as to pass between the lower arm and the upper arm of the rear suspension. The rear structure of the automobile, which is characterized by being 3. The rear structure of the automobile according to claim 1, wherein the exhaust pipe is two, and the silencers connected to the exhaust pipes face each other on both sides of the vehicle in a state substantially parallel to each other. The rear structure of the vehicle, wherein the rear floor portion of the vehicle is disposed between the silencers. 4. The rear structure of an automobile according to claim 1, 2, or 3, wherein a lower surface of a rear floor portion of the vehicle is provided so as to be inclined obliquely upward toward the rear and smoothly connected to a lower side portion of the rear bumper. A wing member is provided below the rear floor portion so as to extend in the vehicle width direction by receiving a vehicle traveling wind flowing along a lower surface of the rear floor portion and generating a downward pressing force. Rear structure of the car.