JP2020117042A - Vehicle rear part structure - Google Patents

Abstract

To provide a vehicle rear part structure that can appropriately prevent or inhibit a defect such that an auxiliary machine mounted at a vehicle rear part is damaged at the time of a rear collision of a vehicle.SOLUTION: A vehicle rear part structure A includes a standing attachment part 40 attached to a lower back 7 and a substantially L-shaped reinforcement member 4 having a front-to-rear extended part 41 overlapped via a rear floor part 2 with a rear side member 3 to be connected thereto. The rear side member 3 is sectioned into a first region S1 overlapped with the front-to-rear extended part 41 to be connected thereto, a second region S2 located adjacently to the first region on the vehicle front side thereof, and a third region S3 located adjacently to the second region on the vehicle front side thereof. In addition, the first and third regions S1, S3 are configured as regions with the rigidity higher than that of the second region S2, and a front end P of the first region S1 is located on the vehicle front side of an auxiliary machine 1.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vehicle rear portion structure capable of suitably protecting auxiliary equipment such as a battery mounted on the vehicle rear portion.

For example, in a hybrid vehicle, a battery (auxiliary equipment) may be mounted at the rear of the vehicle.
One example thereof is schematically shown in FIG. In the figure, the battery 1 is mounted on the rear floor portion 2 so as to be located on the vehicle front side of the lower back 7. A rear side member 3 as a skeletal member of the vehicle body, which extends in the vehicle front-rear direction, is joined to a lower surface portion of the rear floor portion 2. Reference numeral 8 indicates a wheel house.

In the above structure, when a rear collision of the vehicle occurs and a large collision load F is input to the lower back 7 from the rear side of the vehicle as shown in FIG. 5B, the rear side member 3 and the rear floor portion 2 are viewed from the side. It transforms into a roughly V shape. Therefore, the battery 1 rotates and tilts obliquely, and the rear upper portion of the battery 1 may come into contact with the lower back 7 and be damaged. Further, when the collision load F is considerably large, the lower front side of the battery 1 hits the wheel house 8, and the battery 1 is sandwiched and constrained between both the wheel house 8 and the lower back 7. Therefore, the load acting on the battery 1 increases, and the possibility of damaging the battery 1 becomes greater.
From the viewpoint of protecting the battery 1, it is desired to prevent the above-mentioned situation from occurring.
If a wide range of the rear floor portion 2 is reinforced with a member having high rigidity in order to deal with the above situation, the weight and the manufacturing cost increase. Further, when a rear collision of the vehicle occurs, there is a disadvantage that it becomes difficult to absorb the shock due to the deformation of the rear portion of the vehicle.

JP, 2004-224285, A JP, 2014-129042, A JP, 2006-88886, A

The present invention has been devised under the circumstances as described above, and it is possible to appropriately prevent or suppress the risk that an auxiliary machine such as a battery mounted on the rear part of a vehicle is damaged during a rear-end collision of the vehicle. The object is to provide a possible vehicle rear structure.

In order to solve the above problems, the present invention takes the following technical means.

The vehicle rear structure provided by the present invention is an auxiliary machine mounted on the rear floor so as to be located on the vehicle front side of the lower back of the vehicle, and the vehicle so as to pass directly under or near the auxiliary machine. A rear vehicle structure that includes a rear side member that extends in the front-rear direction and that is joined to a lower surface portion of the rear floor portion. And the upright attachment portion is attached to the lower back so as to stand upright in the vertical height direction along the front surface portion of the lower back, while the front-rear extension portion includes the rear side member. A reinforcing member extending along the rear side member and being joined to the rear side member by sandwiching the rear floor portion therebetween. 1 region, a second region adjacent to the vehicle front side of the first region and having a width in the vehicle front-rear direction, and a second region adjacent to the vehicle front side of the second region in the vehicle front-rear direction And a first region and a third region which are higher in strength than the second region, and the front end of the first region is higher than the auxiliary machine. It is characterized by being located on the front side of the vehicle.

With such a configuration, the following effects can be obtained.
First, when a rear collision of a vehicle occurs, the rear side member and the rear floor portion are Z-shaped in a side cross-sectional view or are It is possible to prevent or suppress the auxiliary equipment from rotating and inclining based on the fact that the auxiliary member is bent and deformed in a close shape and the reinforcing member itself suppresses the inclination of the rear side member and the rear floor portion. For this reason, it is possible to eliminate or reduce the possibility that the auxiliary machine will be damaged by hitting the lower back strongly.
Secondly, the auxiliary machine is arranged so as to overlap the first area as the high-strength area in the vehicle front-rear direction, which also enhances the effect of preventing damage to the auxiliary machine.
Thirdly, at the time of a rear collision of the vehicle, the rear side member and the rear floor portion of the vehicle can be deformed, so that it is possible to absorb the shock by this deformation.
Fourthly, since it is not necessary to reinforce a wide range of the rear floor portion with high rigidity, it is possible to suppress an increase in vehicle weight and an increase in manufacturing cost.

Other features and advantages of the present invention will become more apparent from the following description of the embodiments of the invention with reference to the accompanying drawings.

FIG. 1 is a schematic perspective view of an essential part showing an example of a vehicle rear portion structure according to the present invention, and is a view of a vehicle rear portion viewed from a substantially central portion in the front-rear direction and near a corner of the vehicle rear portion. FIG. 2 is a schematic exploded perspective view of a main part of FIG. 1. FIG. 3 is a sectional view taken along line III-III in FIG. 1. (A), (b) is explanatory drawing which shows typically the effect|action of the vehicle rear part structure shown in FIG. (A), (b) is explanatory drawing which shows a prior art typically.

Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.
The same components as those in FIG. 5 described above are appropriately assigned the same reference numerals as those in FIG.

The vehicle rear structure A shown in FIGS. 1 and 2 is applied to, for example, a hybrid vehicle, and includes a battery 1 and a rear floor portion 2 as an example of the “auxiliary equipment” described in claim 1 (in the drawing, a virtual line A rear side member 3, an L-shaped reinforcing member 4 as an example of the “reinforcing member” described in claim 1, a reinforcement 5, and an additional reinforcing member 6. .. The reinforcement 5 and the additional reinforcing member 6 do not correspond to the specific examples of the “reinforcing member” recited in claim 1.

The battery 1 is, for example, a battery for auxiliary equipment such as a lead storage battery, and is placed on the battery tray 10 and between the lower back 7 and the wheel house 8 (rear wheel house) on the rear floor portion 2. It is placed and fixed in the space. The lower back 7 is a portion corresponding to the lower edge of the opening 70 at the rear of the vehicle that is opened and closed by the back door, and is a closed cross-section structure (box cross-section structure) extending in the vehicle width direction. Preferably, as shown in FIG. 3, a reinforcing member 92 for increasing the strength of the mounting location of the battery 1 is provided on the lower surface of the mounting location of the battery 1 in the rear floor portion 2.

The rear side member 3 is configured by using, for example, a hat-shaped member having a pair of flange portions 30, and the pair of flange portions 30 are welded to the lower surface portion of the rear floor portion 2. The rear side member 3 extends from the front surface portion 7 a of the lower back 7 to the vehicle front side with respect to the battery 1 so as to pass immediately below or near the battery 1. Preferably, as shown in FIG. 3, at least a part of rear side member 3 is set to be located directly below battery 1.

As shown in FIG. 2, the L-shaped reinforcing member 4 is, in the present embodiment, one in which two constituent members 4a and 4b are integrally joined. However, the present invention is not limited to this, and the L-shaped reinforcing member 4 may be configured by a single member.
The constituent member 4a has a hat-shaped cross-section member bent into a substantially L-shape, and has an upright mounting portion 40 standing upright in the vertical direction and an auxiliary portion 41a connected to the lower portion thereof. The constituent member 4b is a hat-shaped member having a cross section that extends in a certain direction. The L-shaped reinforcing member 4 is configured such that one end side of the constituent member 4b is overlapped and welded to the auxiliary portion 41a of the constituent member 4a, and the constituent member 4b and the auxiliary portion 41a are mounted upright. A front-rear extending portion 41 is connected to a lower portion of the portion 40 and extends in the vehicle front-rear direction. Therefore, the front-rear direction extending portion 41 and the upright mounting portion 40 are connected to each other in a substantially L shape in a side view.

The upright mounting portion 40 of the L-shaped reinforcing member 4 is fixed to the lower back 7 so as to erect in the vertical height direction along the front surface portion 7 a of the lower back 7. On the other hand, the front-rear extending portion 41 extends along the rear side member 3 and is overlapped and joined to the rear side member 3 with the rear floor portion 2 interposed therebetween. A front end of the longitudinally extending portion 41 (corresponding to a front end P of a first region S1 described later) is located on the vehicle front side of the battery 1.

The reinforcement 5 is a member fitted and welded to the inside of the rear side member 3 to reinforce the rear side member 3, and has, for example, a substantially U-shaped cross section that extends in a certain direction. The reinforce 5 is provided in an arrangement spaced apart from the front end of the front-rear direction extending portion 41 by an appropriate dimension on the vehicle front side.

The rear side member 3 is divided into the first to third regions S1 to S3 by the L-shaped reinforcing member 4 and the reinforcement 5 which are provided in a spaced apart manner. The first region S1 is a region where the L-shaped reinforcing member 4 is overlapped and joined with the rear floor portion 2 interposed therebetween. The second region S2 is a region between the first region S1 and the reinforcement 5, and no reinforcing member is provided. The third area S3 is an area where the reinforcement 5 is provided. For this reason, the first and third regions S1 and S3 are regions of higher strength than the second region S2.

The additional reinforcing member 6 is for further increasing the strength of the first region S1, and includes a main body portion 60 that is fitted into the inside of the rear side member 3 and welded, and a base end portion side of the main body portion 60. It has a mounting piece 61 for fixing to the lower back 7. Preferably, the front end of the additional reinforcing member 6 is arranged to substantially coincide with the front end P of the first region S1 in the vehicle front-rear direction.
A cross member 91 extending in the vehicle width direction is provided on the lower surface side of the rear floor portion 2, and the vehicle width direction end portion thereof is connected to the rear side member 3. Preferably, in the vehicle front-rear direction, the front edge portion of the cross member 91 is set to be substantially aligned with the front end P of the first region S1.

In the present embodiment, the seatbelt anchor mounting member 90 is provided in the second region S2. Unlike the L-shaped reinforcing member 4 and the reinforcement 5, the mounting member 90 does not sufficiently enhance the strength of the rear side member 3 and does not interfere with the later-described action at the time of a rear collision of the vehicle.
The rear end of the third region S3 is arranged to substantially coincide with the rear end of the wheel house 8 in the vehicle front-rear direction, for example.

Next, the operation of the vehicle rear portion structure A described above will be described.

The above-mentioned vehicle rear structure A is schematically shown in FIG. 4(a). When a rear-end collision of the vehicle occurs and the collision load F is input to the lower back 7, the rear side member 3 has a Z-shape or a shape close to this when viewed from the side, as shown in FIG. It will be bent and deformed. This is because the first and third regions S1 and S3 have higher strength than the second region S2 and are less likely to be deformed, while the second region S2 functions as a weak portion and the collision load F This is because the vehicle rotates in the direction of the arrow Na at a position on the vehicle front side with respect to the battery 1 when the vehicle is received. When the above-described bending deformation occurs, the first region S1 is prevented from being greatly inclined.

On the other hand, since the L-shaped reinforcing member 4 is joined to both the lower back 7 and the first region S1 of the rear side member 3, the first region S1 is prevented from tilting relative to the lower back 7. Further, when the inclination of the first region S1 is suppressed by the L-shaped reinforcing member 4 as described above, the rear side member 3 may be bent or deformed in the Z shape or a shape close to the Z shape. Be assured. Therefore, the first and third regions S1 and S3 have higher strength than the second region S2, and the L-shaped reinforcing member 4 is provided. A large inclination of S1 is effectively prevented.

As described above, when the first region S1 is prevented from being greatly tilted, the battery 1 is also prevented from being greatly tilted, and unlike the conventional technique shown in FIG. It does not come into strong contact with the lower back 7. Therefore, damage to the battery 1 can be prevented.

Further, since the second region S2 is positioned upright on the vehicle front side of the battery 1, it is difficult for the battery 1 to strongly contact the wheel house 8 which is a highly rigid portion. In addition, the first region S1 is a region that is not easily compressed and deformed by the collision load F, whereas the battery 1 is located on the vehicle rear side with respect to the front end P of the first region S1. It is also possible to prevent the battery 1 from being strongly sandwiched between the wheel house 8 and the lower back 7. As a result, damage to the battery 1 can be prevented more appropriately.

When a rear collision of the vehicle occurs, the rear side member 3 is deformed in the above-described manner, and the rear floor portion 2 and other related members are also deformed accordingly. Therefore, the deformation of each of these portions makes it possible to absorb impact and improve not only the protection performance of the battery 1 but also the occupant protection performance. In addition, according to the present embodiment, it is not necessary to reinforce a wide range of the rear floor portion 2 with high rigidity, which is also preferable in suppressing an increase in weight of the vehicle and an increase in manufacturing cost.

The present invention is not limited to the contents of the above-mentioned embodiment. The specific configuration of each part of the vehicle rear structure according to the present invention can be modified in various ways within the scope intended by the present invention.

The reinforcing member having the upright mounting portion and the front-rear extending portion may be formed by connecting the upright mounting portion and the front-rear extending portion in a substantially L shape in a side view, and the overall configuration of the reinforcing member is L-shaped. It doesn't have to be. In addition, as described above, the reinforcing member can be formed of a single member.
As a means for making the third region of the rear side member more rigid than the second region, a member different from the reinforcement 5 may be used.

The auxiliary device is not limited to the battery, and includes various charging devices such as a capacitor, and may be devices and instruments other than the charging device. The vehicle to which the present invention is applied is not limited to a hybrid vehicle, but can be applied to an electric vehicle or a general engine vehicle.

A vehicle rear structure P front end (of the first region)
S1 to S3 First to third area 1 Battery (auxiliary equipment)
2 Rear floor 3 Rear side member 4 L-shaped reinforcing member (reinforcing member)
40 Standing attachment part 41 Front-rear extension part 5 Reinforce 7 Lower back 7a Front part (of lower back)

Claims (1)

Auxiliary equipment mounted on the rear floor so as to be located on the vehicle front side of the vehicle lower back,
A rear side member that extends in the vehicle front-rear direction so as to pass immediately below or in the vicinity of this auxiliary machine and is joined to the lower surface of the rear floor section;
A vehicle rear structure comprising:
It has an upright mounting part and a front-back direction extending part connected to each other in a substantially L-shape in a side view, and the upright mounting part stands upright in a vertical height direction along a front surface part of the lower back. While being attached to the lower back, the front-rear direction extending portion further includes a reinforcing member that extends along the rear side member and that is joined to the rear side member by being overlapped with the rear floor portion therebetween.
The rear side member has a first region in which the front-rear direction extending portion is overlapped and joined, a second region adjacent to the vehicle front side of the first region and having a width in the vehicle front-rear direction, and The second region is divided into a third region adjacent to the vehicle front side and having a width in the vehicle front-rear direction, and the first and third regions have a higher strength region than the second region. It is said that
A vehicle rear portion structure, wherein a front end of the first region is located on a vehicle front side with respect to the accessory.

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