JP2023134923A - Vehicle rear part structure - Google Patents

Abstract

To provide a vehicle rear part structure that is able to appropriately prevent or hinder such a failure that a power storage device mounted in a vehicle rear part may be damaged in the event of a rear collision and a side collision of a vehicle.SOLUTION: In an aspect of a vehicle rear structure A, a motor M is located on a vehicle rear side of a drive shaft 4 and has a width in a vehicle longitudinal direction; in a vehicle plan view, power storage device 1 is located on the vehicle rear side of the drive shaft 4 and on one side of the motor M in a vehicle width direction, and in a vehicle side view, at least part of it is provided so as to overlap the motor M; and a rear end part 1a of the power storage device 1 is substantially aligned with the rear end portion 7 of the motor M in a vehicle longitudinal direction, or is located on a vehicle front side from it.SELECTED DRAWING: Figure 2

Description

The present invention relates to a vehicle rear structure that can suitably protect a power storage device such as a battery mounted in the rear of a vehicle.

For example, in a hybrid vehicle, an auxiliary battery may be mounted at the rear of the vehicle. In this case, a method is often employed in which a downwardly depressed recess is provided in the rear floor of the vehicle and the battery is housed in the recess (for example, see Patent Documents 1 and 2). According to such means, it is possible to mount the battery in the rear part of the vehicle with good space efficiency and good appearance.

However, in the above-mentioned conventional technology, there is room for improvement as follows.
In other words, when a rear collision or side collision occurs and a large collision load is applied to the rear of the vehicle from the rear side of the vehicle or from the outside in the vehicle width direction, it is necessary to appropriately prevent this collision load from acting strongly on the battery. It is recommended to avoid this and prevent damage to the battery.
In contrast, the reality is that no means have been proposed to date that can adequately and accurately meet such requests.
As a means for protecting the battery, for example, a means for additionally providing a highly rigid reinforcing member around the battery mounting area in the rear floor section can be considered. However, such means lead to an increase in weight and manufacturing cost.

JP2014-82167A Japanese Patent Application Publication No. 2020-19296 JP2019-73212A

The present invention was devised under the above-mentioned circumstances, and is intended to appropriately prevent or prevent damage to a power storage device such as a battery mounted in the rear of a vehicle in the event of a rear or side collision of the vehicle. The objective is to provide a vehicle rear structure that can be restrained.

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

The vehicle rear structure provided by the present invention includes a power storage device disposed in a recess provided in a rear floor portion, and a rear wheel drive drive located in an area between left and right rear wheels and extending in the vehicle width direction. A rear vehicle structure comprising a shaft and a motor as a rotational drive source thereof, the motor being located on the vehicle rear side of the drive shaft and having a width in the longitudinal direction of the vehicle, The power storage device is located on the vehicle rear side of the drive shaft and on one side of the motor in the vehicle width direction when viewed from the top of the vehicle, and is provided so as to at least partially overlap the motor when viewed from the side of the vehicle. The rear end portion of the power storage device is characterized in that the position of the rear end portion of the power storage device substantially coincides with the rear end portion of the motor in the longitudinal direction of the vehicle, or is located further forward of the vehicle than the rear end portion of the motor.

According to such a configuration, the following effects can be obtained.
That is, when a rear collision of a vehicle occurs and a collision load is input from the rear side of the vehicle to the rear of the vehicle, this collision load is received by the motor so that it does not act strongly on the rear end of the power storage device. It is possible to do so. On the other hand, when a side collision occurs and a collision load is applied to the rear of the vehicle from the outside in the vehicle width direction, the existence of the drive shaft causes the collision load to be applied strongly or directly to the power storage device. It is possible to prevent it from working. Therefore, according to the present invention, it is possible to appropriately protect the power storage device in both cases of a rear collision and a side collision of the vehicle.
The present invention uses a rear wheel drive drive shaft and a motor as its rotational drive source as a part for protecting the power storage device, and does not use a separate dedicated member for protecting the power storage device. . Therefore, it is also possible to suppress increases in vehicle weight and manufacturing costs.
Further, according to the present invention, the power storage device can be placed in a location with good space efficiency in relation to the drive shaft and the motor, and the layout is also good.

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

1 is a schematic side sectional view of a main part showing an example of a vehicle rear structure according to the present invention. 2 is a schematic sectional view taken along line II-II in FIG. 1. FIG. FIG. 2 is a schematic sectional view taken from the rear of the vehicle taken along arrow III in FIG. 1;

Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

The vehicle rear structure A shown in FIGS. 1 to 3 is applied to, for example, a hybrid vehicle, and includes a battery 1, a rear floor section 2, and a drive shaft 4 (4a, 4b) for driving the left and right rear wheels 3 (3a, 3b). ), a motor M, and a driving force transmission device 5.

The battery 1 is an example of a power storage device according to the present invention, and is, for example, a battery for an auxiliary device such as a lead-acid battery. The rear floor section 2 is constructed using a floor panel and is provided so as to extend toward the vehicle front side of the lower back 60, and a deck board 61 is appropriately disposed on the upper surface side thereof. In FIG. 1, reference numeral 62 indicates a backdoor.
A downwardly depressed recess 20 is formed in the rear floor portion 2. The battery 1 is placed within the recess 20 and fixed using a suitable fixing member (not shown). Although the recess 20 is formed by a rectangular cylindrical side wall 20a surrounding the battery 1 and a bottom wall 20b on which the battery 1 is placed, the specific shape of the recess 20 is not limited thereto.

The drive shafts 4a, 4b have one end connected to the rear wheels 3a, 3b, the other end connected to the driving force transmission device 5, and extend in the vehicle width direction. The drive shafts 4a, 4b may be of other configurations, such as those using constant velocity joints, instead of having a relatively simple shaft shape as shown.

The motor M is for rotationally driving the drive shaft 4, and uses a main battery (not shown) different from the battery 1 as a driving power source. The driving force transmission device 5 is, for example, a differential gear device. A detailed explanation of the combination structure of the motor M and the driving force transmission device (differential gear device) 5 will be omitted, but these are similar to the conventionally known structure described in Patent Document 3, for example, and The rotation of the shaft is appropriately decelerated and then transmitted to both the drive shafts 4a and 4b in a manner that allows a speed difference.
The motor M is connected to the driving force transmission device 5, and then connected to the drive shafts 4a, 4b.
It is located on the rear side of the vehicle and has an appropriate width La in the longitudinal direction of the vehicle. Preferably, the motor M has a shape in which the width La is larger than the width Lb in the vehicle width direction, that is, a so-called vertically elongated shape in the vehicle longitudinal direction. This is preferable in order to increase the amount of overlap between the battery 1 and the motor M when viewed from the side of the vehicle.

As shown in FIG. 2, the battery 1 is located on the vehicle rear side of the drive shaft 4 and on one side of the motor M in the vehicle width direction when the vehicle is viewed from above. In the vehicle width direction, a portion of the drive shaft 4 overlaps the battery 1, but other portions of the drive shaft 4 are located on both left and right sides of the battery 1 and extend in the vehicle width direction. It has become. As shown in FIG. 1, at least a portion of the battery 1 overlaps the motor M when viewed from the side of the vehicle. In this embodiment, the battery 1 overlaps the motor M in both the vertical height direction and the vehicle longitudinal direction.
The rear end 1a of the battery 1 is located further forward of the vehicle than the rear end 7 of the motor M by an appropriate dimension Lc. However, as will be described later, it is also possible to adopt a configuration in which the positions of the two rear end portions 1a and 7 in the longitudinal direction of the vehicle are substantially the same.

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

When a rear collision occurs, a large collision load (rear collision load) F1 may be input to the rear of the vehicle from the rear side of the vehicle, as shown in FIG. 2 . On the other hand, the rear end 1a of the battery 1 is located closer to the front of the vehicle than the rear end 7 of the motor M. Therefore, the collision load F1 acts on the rear end portion 7 of the motor M before acting on the battery 1, and is received by the motor M. Therefore, it is possible to prevent the collision load F1 from strongly and directly acting on the battery 1, thereby protecting the battery 1.

Different from the above case, a side collision of the vehicle may occur, and a large collision load (side collision load) F2 may be input from the outside in the vehicle width direction to one side of the rear part of the vehicle. On the other hand, one drive shaft 4a extends so as to protrude further outward than the battery 1 in the vehicle width direction. Therefore, the drive shaft 4a exerts a tensile force against the collision load F2, and most of the collision load F2 is received by the drive shaft 4a. Therefore, strong and direct impact of the collision load F2 on the battery 1 is also avoided, and the battery 1 is appropriately protected.
In addition, when the side collision of the vehicle occurs on the other side of the rear part of the vehicle and the collision load (side collision load) F3 is input, contrary to the above, when the collision load (side collision load) F3 is input, the collision load is transmitted from the input point of the collision load F3 to the battery 1. In addition to the distance between the two, the battery 1 is protected by the presence of the drive shaft 4b and the motor M.

As described above, according to the present embodiment, it is possible to appropriately protect the battery 1 in both a rear collision and a side collision of the vehicle, but as a means for protecting the battery 1, The existing drive shaft 4 and motor M are used. Therefore, it is also possible to suppress increases in vehicle weight and manufacturing costs.

When viewed from the side of the vehicle, the battery 1 overlaps the motor M by a large area ratio, and is not located in a position that significantly protrudes from the motor M in either the longitudinal direction or the vertical height direction of the vehicle. . Both the motor M and the battery 1 are mounted close to each other in a space-efficient manner, and their layout is also good. Therefore, the vehicle rear structure A of the present embodiment can be suitably used for, for example, a small vehicle.

The present invention is not limited to the content of the embodiments described above. The specific configuration of each part of the vehicle rear structure according to the present invention can be modified in various ways within the intended scope of the present invention.

In the embodiment described above, the rear end portion 1a of the battery 1 is located further forward of the vehicle than the rear end portion 7 of the motor M, but the present invention is not limited thereto. The rear end portion 1a of the battery 1 may be configured to substantially match the rear end portion 7 of the motor M in the longitudinal direction of the vehicle. Even if the rear end 1a of the battery 1 is arranged to slightly protrude toward the rear of the vehicle than the rear end 7 of the motor M, the battery may 1 from being damaged (for example, when a collision load is input to battery 1, battery 1 is pushed forward of the vehicle and moves to the front side of the vehicle than motor M, and after that, battery 1 A configuration in which no collision load is directly input is possible, and such a configuration is also included within the technical scope of the present invention.

The power storage device referred to in the present invention is not limited to a battery for an auxiliary device, but may be a main battery, and further includes various charging devices such as a capacitor.
Vehicles to which the present invention is applied are not limited to hybrid vehicles, but can also be applied to electric vehicles and general engine vehicles. The type of motor, the specific configuration of the drive shaft, etc. are not limited.
The recessed portion of the rear floor portion referred to in the present invention may be any recessed portion that can accommodate the power storage device, and its specific shape, size, position, etc. are not limited. The entire power storage device may not fit within the recess, but a portion of the power storage device may protrude outside the recess.

A Vehicle rear structure M Motor 1 Battery (power storage device)
1a Rear end (of battery)
2 Rear floor part 20 Recessed part 3 (3a, 3b) Rear wheel 4 (4a, 4b) Drive shaft 7a Rear end part (of the motor)

Claims (1)

A power storage device arranged in a recess provided in the rear floor part;
A rear wheel drive drive shaft located in an area between the left and right rear wheels and extending in the vehicle width direction, and a motor as a rotational drive source thereof;
A vehicle rear structure comprising:
The motor is located on the vehicle rear side of the drive shaft and has a width in the vehicle longitudinal direction,
The power storage device is located on the vehicle rear side of the drive shaft and on one side of the motor in the vehicle width direction when viewed from the top of the vehicle, and is provided so as to at least partially overlap the motor when viewed from the side of the vehicle. Ori,
A rear end structure of a vehicle, wherein the rear end portion of the power storage device is substantially aligned with the rear end portion of the motor in the longitudinal direction of the vehicle, or is located further forward of the vehicle than the rear end portion of the motor.

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