JP2019018685A - Vehicle body structure - Google Patents

Abstract

To obtain a vehicle structure that is able to restrict damage to a battery unit in the event of vehicle collision.SOLUTION: A motor unit 16 is attached to a rear side member 28 extended substantially in forward and backward directions of the vehicle, and a deformation start point 29 is provided in the rear side member 28. The deformation start point 29 is provided in a part corresponding to the motor unit 16 in the rear side member 28 in a side view of the vehicle and near a top part, in a curved shape, of the rear side member 28. By virtue of this, the deformation start point 29 deforms in a projecting shape toward the upper side of the vehicle in the even that collision load is input to an inner side in forward and backward directions of the vehicle from the outer side, in the forward and backward directions of the vehicle, of the rear side member 28. Therefore, the motor unit 16 displaces such that rear side end of the vehicle rotates in a downward direction of the vehicle around the deformation start point part 29. This restricts contact of the motor unit 16 with a battery unit 14 and hence restricts damage to the battery unit 14 in the event of vehicle collision.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle body structure.

  Patent Document 1 below discloses a battery mounting structure for an electric vehicle. This vehicle is provided with a battery unit on the vehicle lower side of the passenger compartment. The battery unit has an end in the vehicle width direction coupled to the vehicle body member, and an end on the front side of the vehicle is fixed to the front suspension member. Thus, the torsional rigidity of the vehicle body is improved using the battery unit.

JP 2012-91635 A

  By the way, in recent years, it is required to extend the cruising distance of an electric vehicle, and in order to cope with this, it is necessary to enlarge the battery unit. In order to reduce the influence on the passenger compartment in increasing the size, it is conceivable to expand the battery unit in the vehicle front-rear direction. However, if the battery unit is expanded in the vehicle front-rear direction, the distance between the power unit and the battery unit is increased. Therefore, there is a possibility that the power unit that is displaced by receiving a collision load at the time of a vehicle collision comes into contact with the battery unit and damages the battery unit. The prior art has room for improvement in this regard.

  In view of the above facts, an object of the present invention is to obtain a vehicle body structure capable of suppressing damage to a battery unit at the time of a vehicle collision.

  According to a first aspect of the present invention, there is provided a vehicle body structure including a power unit provided in at least one of a vehicle front portion and a vehicle rear portion, a battery unit provided inside the vehicle front-rear direction with respect to the power unit, and a substantially vehicle front-rear direction. And a side member that is attached to the power unit and is formed in a portion corresponding to the power unit in the side member in a side view of the vehicle, and from the vehicle longitudinal direction outside of the side member to the vehicle longitudinal direction inside And a deformation starting point portion that deforms in a convex shape toward the vehicle upper side when a collision load is input.

  According to the first aspect of the present invention, the power unit is provided in at least one of the front part and the rear part of the vehicle, and the battery unit is provided on the inner side in the vehicle front-rear direction with respect to the power unit. The power unit is attached to a side member extending substantially in the vehicle front-rear direction, and a deformation starting point is provided on the side member. The deformation starting portion is formed in a portion corresponding to the power unit in the side member in a side view of the vehicle, and protrudes upward in the vehicle when a collision load is input from the outside of the side member in the vehicle longitudinal direction to the vehicle longitudinal direction inward. It deforms into a shape. Therefore, the power unit attached to the side member is displaced so that the rear end of the vehicle rotates about the deformation starting point to the vehicle lower side as viewed from the side of the vehicle as the side member is deformed. As a result, it is possible to suppress the power unit from being displaced toward the battery unit due to the collision load and coming into contact with the battery unit, and to secure the amount of deformation of the side member and absorb the collision load. For this reason, a vehicle body structure can be simplified.

  A vehicle body structure according to a second aspect of the present invention is the vehicle body structure according to the first aspect of the invention, wherein the side member has a high rigidity with a bending rigidity higher than that of other portions on the inner side in the vehicle front-rear direction than the deformation starting point. Is provided.

  According to the second aspect of the present invention, the high rigidity portion whose bending rigidity is higher than that of the other portion is provided on the inner side in the vehicle front-rear direction from the deformation starting point portion of the side member. Therefore, when a collision load is input from the vehicle front-rear direction outer side of the side member to the vehicle front-rear direction inner side, stress concentrates on the deformation start point part, so that the side member can be more reliably deformed around the deformation start point part. .

  The vehicle body structure according to a third aspect of the present invention is the vehicle body structure according to the first or second aspect, wherein the deformation starting point portion receives a collision load from the vehicle longitudinal direction outside of the side member to the vehicle longitudinal direction inside. In this case, the end of the side member on the outer side in the vehicle front-rear direction is displaced toward the vehicle lower side.

  According to the third aspect of the present invention, the deformation starting point portion is configured so that the end portion of the side member on the outer side in the vehicle front-rear direction is located below the vehicle when a collision load is input from the outer side in the vehicle front-rear direction to the inner side in the vehicle front-rear direction. It is configured to be displaced to the side. Therefore, since the power unit attached to the side member is displaced so as to rotate more reliably to the vehicle lower side in a side view of the vehicle, it is possible to more reliably suppress the power unit from coming into contact with the battery unit.

  A vehicle body structure according to a fourth aspect of the present invention is the vehicle body structure according to any one of the first to third aspects, wherein the power unit is attached to the side member via a suspension member. An end of the power unit in the vehicle front-rear direction is fixed to a portion of the suspension member that is disposed on the vehicle front-rear direction inner side from the deformation starting point.

  According to the fourth aspect of the present invention, the power unit is attached to the side member via the suspension member, and the end of the power unit in the vehicle front-rear direction is located on the vehicle front-rear direction inner side than the deformation starting point of the suspension member. It is fixed to the placed part. Therefore, when a collision load is input from the outside of the side member in the longitudinal direction of the vehicle to the inside of the longitudinal direction of the vehicle, the suspension member and the power unit are displaced by the displacement of the side member. The power unit can be displaced so as to rotate downward with respect to the vehicle front-rear direction inner end. That is, it is possible to suppress the end of the power unit in the vehicle front-rear direction inside from being displaced along the vehicle front-rear direction to the battery unit side. For this reason, it can suppress further that a power unit and a battery unit contact | abut.

  The vehicle body structure according to the first aspect of the present invention has an excellent effect that damage to the battery unit at the time of a vehicle collision can be suppressed.

  The vehicle body structure according to the second aspect of the present invention has an excellent effect that damage to the battery unit at the time of a vehicle collision can be further suppressed.

  The vehicle body structure according to the third aspect of the present invention has an excellent effect that the damage of the battery unit at the time of a vehicle collision can be further suppressed.

  The vehicle body structure according to the fourth aspect of the present invention has an excellent effect that the damage to the battery unit at the time of a vehicle collision can be more reliably suppressed.

It is a schematic sectional drawing which shows the vehicle body structure which concerns on one Embodiment. It is an expanded sectional view which expands and shows the Z section in FIG. It is a perspective view which shows the power unit in the vehicle body structure which concerns on one Embodiment.

  Hereinafter, an embodiment of a vehicle body structure according to the present invention will be described with reference to FIGS. 1 to 3, the arrow FR indicates the front side in the vehicle longitudinal direction, the arrow OUT indicates the vehicle width direction outside, and the arrow UP indicates the vehicle vertical direction upper side.

  As shown in FIG. 1, a vehicle 12 to which the vehicle body structure 10 is applied is an electric vehicle that travels by an electric motor (motor unit 16) as a power unit that is driven by power supplied from a battery unit 14 to be described later. A floor panel 18 is provided. On both sides on the outer side in the vehicle width direction with respect to the floor panel 18, rockers (not shown) (also referred to as “side sills”) are arranged in a pair on the left and right with the vehicle longitudinal direction as the longitudinal direction. As an example, a terminal portion of the floor panel 18 in the vehicle width direction is joined to the upper portion of the rocker by spot welding.

  The battery unit 14 is provided under the vehicle floor, that is, between the vehicle lower side of the floor panel 18 and the pair of left and right rockers. The battery unit 14 is formed in a substantially rectangular box shape in which the front end portion 20 is disposed at a position corresponding to the dash panel 22 and the rear end portion 24 is disposed in the vicinity of a suspension member 26 described later.

  A rear side member 28 as a side member is coupled to the rear end portions of the pair of left and right rockers via a coupling member 27 as a highly rigid portion. As an example, the coupling member 27 is made of metal formed by casting. The rear end portion of the rocker is coupled to the end portion on the front side of the vehicle, and the front end portion of the rear side member 28 is disposed on the end portion on the rear side of the vehicle. Are combined.

  The pair of left and right rear side members 28 are formed in an elongated shape substantially along the vehicle longitudinal direction, and a rear side member front portion 28A located between the pair of left and right rear tires 30 and a rear end of the rear side member front portion 28A. A rear side member rear portion 28B extending from the rear portion to the vehicle rear side. The rear side member front portion 28A is coupled to a rear wheel house (not shown) that houses the rear tire 30 therein.

  The rear side member rear portion 28B is disposed on the vehicle upper side with respect to both sides in the vehicle width direction of a rear floor panel (not shown) constituting the floor surface of the rear portion of the vehicle and is coupled to the upper surface of the rear floor panel.

  As shown in FIG. 2, a deformation starting point portion 29 is formed between the rear side member front portion 28 </ b> A and the rear side member rear portion 28 </ b> B in the rear side member 28. The deformation starting point 29 is the same as the position of the rear side member 28 corresponding to the motor unit 16, that is, the substantially central portion of the rear side member 28 in the vehicle front-rear direction and the vehicle front-rear direction as shown by the broken line in the figure. It is formed at the site. Further, the rear side member 28 is formed such that a part of the front side of the rear side member front portion 28A and the rear side member rear portion 28B is curved in a convex shape toward the vehicle upper side. The rear side member 28 is disposed in the vicinity of the apex portion in the curved shape.

  A suspension member 26 is disposed on the vehicle lower side of the pair of left and right rear side members 28 and between the pair of left and right rear tires 30. As shown in FIG. 3, the suspension member 26 includes a front cross member 32 extending in the vehicle width direction as a portion disposed in the vehicle longitudinal direction inner side of the deformation starting point portion 29 of the suspension member 26, and the front cross member. 32, a pair of left and right side rails 33 extending from both ends in the vehicle width direction to the vehicle rear side, and a rear cross member 34 connecting the rear ends of the pair of left and right side rails 33 as viewed from above the vehicle. It is formed in a substantially rectangular shape having a space S in the center. The suspension member 26 is supported in a state of being suspended from the rear side member 28, and a suspension for suspending the left and right rear tires 30, a suspension arm, a stabilizer (all not shown), and the like are attached. . As shown in FIG. 2, the lower end surface 36 of the front cross member 32 is disposed on substantially the same plane as the lower end surface 38 of the battery unit 14.

  The motor unit 16 is disposed in the space S of the suspension member 26. The motor unit 16 is located between the pair of left and right side rails 33, and the vehicle front side end (end in the vehicle front-rear direction) 16 A is disposed on the upper surface of the front cross member 32 of the suspension member 26. A pair of left and right is mounted via a substantially cylindrical support mount 35 that is made of an elastic member from the upper side of the vehicle and has an axial direction that is substantially in the vertical direction of the vehicle. The motor unit 16 is attached to the side surface of the rear cross member 34 from the front side of the vehicle via a support mount (both not shown) made of a bracket and an elastic member. The motor unit 16 can rotate a pair of left and right rear tires 30 via an output shaft (not shown). With the above configuration, the motor unit 16 is attached to the rear side member 28 via the suspension member 26.

(Operation and effect of the first embodiment)
Next, the operation and effect of this embodiment will be described.

  In the present embodiment, as shown in FIG. 2, a motor unit 16 provided in at least one of a vehicle front part and a vehicle rear part, and a battery unit 14 provided in the vehicle front-rear direction inner side with respect to the motor unit 16 are provided. Have. The motor unit 16 is attached to a rear side member 28 extending substantially in the vehicle front-rear direction. The rear side member 28 is provided with a deformation starting point portion 29. The deformation starting point portion 29 is formed in a portion corresponding to the motor unit 16 in the rear side member 28 in the vehicle side view and in the vicinity of the apex portion in the curved shape of the rear side member 28. For this reason, the deformation starting point portion 29 is deformed in a convex shape toward the upper side of the vehicle when a collision load is input from the rear side of the rear side member 28 to the inner side of the front and rear of the vehicle (see the two-dot chain line in the figure). ). Therefore, the motor unit 16 attached to the rear side member 28 has a rear side end portion of the rear side member 28 that is convex toward the upper side of the vehicle. It is displaced so as to rotate to the side (see the thin two-dot chain line in the figure). Accordingly, it is possible to suppress the motor unit 16 from being displaced toward the battery unit 14 due to the collision load and coming into contact with the battery unit 14, and to ensure the deformation amount of the rear side member 28 and absorb the collision load. . For this reason, since it is not necessary to add a member for the purpose of increasing rigidity so that the motor unit 16 is not displaced toward the battery unit 14, the vehicle body structure can be simplified. Thereby, the damage of the battery unit 14 at the time of a vehicle collision can be suppressed.

  Further, on the inner side in the vehicle longitudinal direction of the rear side member 28 from the deformation starting point portion 29, there is provided, as an example, a coupling member 27 that is made of metal formed by casting and has higher bending rigidity than other portions. . Therefore, when a collision load is input from the outside in the vehicle front-rear direction of the rear side member 28 to the inside in the vehicle front-rear direction, stress concentrates on the deformation starting point 29, so that the rear side member 28 is more reliably deformed around the deformation starting point 29. Can be made. Thereby, the damage of the battery unit 14 at the time of a vehicle collision can be suppressed more.

  Further, since the deformation starting point portion 29 is disposed in the vicinity of the apex portion of the curved shape of the rear side member 28, the rear side member 28 is input when a collision load is input from the outer side in the vehicle front-rear direction to the inner side in the vehicle front-rear direction. The outer end in the vehicle front-rear direction is displaced to the vehicle lower side (see the two-dot chain line in the figure). Accordingly, since the motor unit 16 attached to the rear side member 28 is displaced so as to rotate more reliably to the vehicle lower side when viewed from the side of the vehicle, the motor unit 16 is more reliably prevented from coming into contact with the battery unit 14. can do. Thereby, damage of the battery unit 14 at the time of a vehicle collision can further be suppressed.

  Further, the motor unit 16 is fixed to a front cross member 32 of a suspension member 26 whose end 16A on the inner side in the vehicle front-rear direction is disposed on the inner side in the vehicle front-rear direction with respect to the deformation starting point 29 on the rear side member 28. Therefore, when a collision load is input from the vehicle longitudinal direction outside of the rear side member 28 to the vehicle longitudinal direction inside, the motor unit 16 has the motor 16 centered on the vehicle longitudinal direction inner end 16A closest to the battery unit 14. The unit 16 can be displaced so as to rotate downward in the vehicle. That is, it is possible to prevent the end 16A of the motor unit 16 on the inner side in the vehicle front-rear direction from being displaced toward the battery unit 14 along the substantially vehicle front-rear direction. For this reason, it can suppress further that the motor unit 16 and the battery unit 14 contact | abut. Thereby, damage of the battery unit 14 at the time of a vehicle collision can be suppressed more reliably.

  In the above-described embodiment, the motor unit 16 is provided between the rear portion of the vehicle 12, that is, the pair of left and right rear tires 30. However, the present invention is not limited to this, and the front portion of the vehicle (for example, FIG. The motor unit 16 is attached to a front side member (not shown) as a side member provided between a pair of left and right front tires 68 shown in FIG. 2 and the deformation starting point portion 29 is located at a position corresponding to the motor unit 16 in the side member. It is good also as a structure which provided.

  The connecting member 27 is not limited to a metal formed by casting, and may be made of a material that is difficult to deform, such as a high tensile material.

  Further, the deformation starting point portion 29 is disposed in the vicinity of the apex portion of the portion curved in a convex shape toward the vehicle upper side formed in a part of the rear side member 28. Thereby, when a collision load is input from the vehicle front-rear direction outside of the rear side member 28 to the vehicle front-rear direction inner side, the deformation starting point portion 29 displaces the end of the rear side member 28 on the vehicle front-rear direction outer side to the vehicle lower side. However, the present invention is not limited to this, and by changing the plate thicknesses of the rear side member 28 at the vehicle upper side and the vehicle lower side at the deformation start point 29, the deformation start point 29 when the collision load is input. However, the rear side member 28 may be configured such that the end of the rear side member 28 on the outer side in the vehicle longitudinal direction is displaced downward in the vehicle. In addition, by forming a stress concentration portion such as a notch in the rear side member 28 at the deformation starting point 29, the deformation starting point 29 causes the end of the rear side member 28 on the outer side in the vehicle front-rear direction when the collision load is input. It is good also as a structure displaced to the vehicle downward side.

  The embodiment of the present invention has been described above, but the present invention is not limited to the above, and various modifications other than those described above can be implemented without departing from the spirit of the present invention. Of course.

10 Body structure 14 Battery unit 16 Motor unit (power unit)
16A end (end of the power unit in the vehicle longitudinal direction)
27 Connecting member (high rigidity part)
28 Rear side member (side member)
29 Deformation start point

Claims (4)

A power unit provided in at least one of a vehicle front portion and a vehicle rear portion;
A battery unit provided on the inner side in the vehicle longitudinal direction with respect to the power unit;
A side member extending substantially in the vehicle longitudinal direction and having the power unit attached thereto;
It is formed in a portion of the side member corresponding to the power unit in a side view of the vehicle, and protrudes upward in the vehicle when a collision load is input from the outside of the side member in the vehicle front-rear direction to the vehicle front-rear direction. A deformation starting point to be deformed;
A vehicle body structure. On the inner side in the vehicle front-rear direction from the deformation starting point portion in the side member, a high-rigidity portion having higher bending rigidity than other portions is provided.
The vehicle body structure according to claim 1. The deformation starting point portion is configured to displace the end portion of the side member on the vehicle front-rear direction outer side to the vehicle lower side when a collision load is input from the vehicle front-rear direction outer side of the side member to the vehicle front-rear direction inner side. Yes,
The vehicle body structure according to claim 1 or 2. The power unit is attached to the side member via a suspension member, and the end of the power unit in the vehicle front-rear direction is disposed at a portion of the suspension member that is disposed on the vehicle front-rear direction inner side from the deformation starting point. Fixed,
The vehicle body structure according to any one of claims 1 to 3.