JP7131243B2 - car body structure - Google Patents

Description

The present invention relates to a vehicle body structure.

An electric vehicle (EV vehicle) is equipped with a battery unit. The battery unit is supported by brackets or the like joined to the vehicle body frame, and is arranged, for example, below a floor panel that constitutes the floor surface of the vehicle.

The electric vehicle described in Patent Document 1 includes a frame structure including a pair of left and right side members arranged below the vehicle body, and a battery unit attached to the frame structure from below the vehicle body. A plurality of girder members are provided at the bottom of the battery unit. The plurality of beam members are spaced apart in the longitudinal direction of the vehicle, extend in the width direction of the vehicle body, and are arranged between the pair of side members. These multiple girder members are made of a metal material (for example, a steel plate) having a strength capable of supporting the load of the battery unit, and are fixed to the side members with bolts or the like.

Patent Document 1 states that the girder member provided in the battery unit functions as a rigid member corresponding to the cross member, so that the rigidity of the vehicle body can be increased.

JP 2012-96789 A

However, the battery unit mounted on the vehicle body is a heavy object having a large inertial weight. Therefore, when torsional vibration occurs in the vehicle body, the battery unit does not follow the vibrating (moving) vehicle body, but moves differently from the vehicle body frame, which may result in relative rotational deviation from the vehicle body frame. be. Therefore, in a vehicle body structure in which a battery unit is mounted, when torsional vibration occurs in the vehicle body, excessive load (for example, shear stress) is applied to the vehicle body frame, noise is generated in the cabin, and steering stability is deteriorated. There were problems such as

In the electric vehicle of Patent Document 1, the girder member provided at the bottom of the battery unit is simply arranged between a pair of side members as a vehicle body frame, and it is an improvement as a measure against torsional vibration of the vehicle body. There is room for

Furthermore, in this electric vehicle, the girder member extends in the vehicle width direction between the battery unit and the pair of side members. Therefore, in this electric vehicle, it is necessary to secure a space for arranging the girder member between the battery unit and the pair of side members. Therefore, in this electric vehicle, it is difficult to increase the dimension of the battery unit in the vehicle width direction, the battery capacity cannot be increased, and the cruising distance cannot be increased.

In view of such problems, the present invention prevents an excessive load from being applied to the vehicle body frame when torsional vibration occurs in the vehicle body while ensuring battery capacity, reduces noise in the cabin, and furthermore controls the vehicle. An object of the present invention is to provide a vehicle body structure capable of avoiding deterioration of stability.

In order to solve the above-described problems, a representative configuration of the vehicle body structure according to the present invention is a vehicle body structure provided with a battery unit mounted on the vehicle body, and the vehicle body structure further includes a floor panel constituting a floor surface of the vehicle. a pair of floor side members extending in the front-rear direction along both left and right sides of a floor panel; and a cross member bridged between the pair of floor side members below the floor panel, wherein the pair of floor A pair of support brackets that are joined to the side members and hold the left and right sides of the rear end of the battery unit to support the battery unit in front of the cross member; and a lateral rod connecting with one of the support brackets, the lateral rod straddling a center line extending in the longitudinal direction of the vehicle through the center of the battery unit in the vehicle width direction.

According to the present invention, when torsional vibration occurs in the vehicle body, excessive load is prevented from being applied to the vehicle body frame, noise in the cabin is reduced, and further, deterioration in steering stability is prevented while ensuring the battery capacity. A body structure that can be avoided can be provided.

It is a figure showing roughly the body structure concerning the example of the present invention. It is a figure which expands and shows a part of the vehicle body structure of FIG. 1 seen from the downward direction. FIG. 3 is a view of the vehicle body structure of FIG. 2 as viewed from arrow B ; FIG. 3 is a C arrow view of the vehicle body structure of FIG. 2 ; FIG. 6 is a diagram schematically showing a vehicle body structure according to another embodiment of the present invention;

A representative configuration of a vehicle body structure according to an embodiment of the present invention is a vehicle body structure provided with a battery unit mounted on the vehicle body. A vehicle body structure comprising a pair of floor side members extending in the front-rear direction along both left and right sides of a panel, and a cross member bridged between the pair of floor side members on the lower side of the floor panel, wherein the pair of floor side members A pair of support brackets that are joined together to hold both the right and left sides of the rear end of the battery unit and support the battery unit in front of the cross member; and a lateral rod connecting with either one of the above, the lateral rod straddling a center line extending in the vehicle front-rear direction through the center of the battery unit in the vehicle width direction.

A battery unit mounted on a vehicle body is a heavy object having a large inertial weight. Therefore, when torsional vibration occurs in the vehicle body, the battery unit does not follow the vibrating (moving) vehicle body, but moves differently from the vehicle body skeleton, resulting in relative rotational deviation from the vehicle body skeleton. put away. Therefore, when torsional vibration occurs in the body of an electric vehicle equipped with a battery unit, excessive load may be applied to the body frame, noise may be generated in the cabin, and steering stability may decrease. .

Therefore, in the present invention, a lateral rod is used to connect the cross member of the vehicle body that spans between the floor side members as the vehicle body frame and either the rear end of the battery unit or the pair of support brackets. . Furthermore, the lateral rod is arranged so as to straddle the center line of the battery unit. Since the support bracket supports the battery unit, it moves integrally with the battery unit when torsional vibration occurs in the vehicle body.

With this configuration, the mounting portion of the lateral rod on the cross member of the vehicle body pushes or pulls the lateral rod in accordance with the torsional vibration of the vehicle body. The rear end of the battery unit or the support bracket is pushed or pulled by the lateral rod accordingly. Therefore, the battery unit follows the vibrating vehicle body and moves in the same manner to a considerable extent.

In other words, the lateral rod supports the battery unit and reliably transmits the supporting load to the vehicle body frame, so that when torsional vibration occurs in the vehicle body, it has the function of synchronizing the movements of the vehicle body frame and the battery unit to a considerable extent. have. Therefore, according to the present invention, when torsional vibration occurs in the vehicle body on which the battery unit is mounted, excessive load is prevented from being applied to the vehicle body frame, noise in the cabin is reduced, and steering stability is lowered. can also be avoided.

Further, in the above configuration, the lateral rod connects the rear end portion of the battery unit or the support bracket located in front of the cross member and facing the cross member, and the cross member. Since the lateral rod is a rod-shaped member, it can be attached even if the distance between the rear end portion of the battery unit or the support bracket and the cross member in the vehicle front-rear direction is reduced. Therefore, according to the above configuration, the battery unit can be extended toward the cross member, that is, toward the rear of the vehicle to increase the battery capacity, thereby increasing the cruising distance of the electric vehicle.

The cross member includes a main body portion extending in the vehicle width direction, and a pair of extensions having higher rigidity than the main body portion, which are joined to both ends of the main body portion and to the pair of floor side members and extend the main body portion outward in the vehicle width direction. and the lateral rod may be attached to either one of the pair of extensions.

Here, the extension is a member whose rigidity is higher than that of the main body by, for example, increasing the plate thickness. Further, the extension is located outside the main body portion of the cross member in the vehicle width direction, and is located closer to the floor side member, which is the body frame. Therefore, by attaching the lateral rod to the extension, the length of the lateral rod can be set longer, and the load from the lateral rod can be easily transmitted to the vehicle body frame. Therefore, according to the above configuration, the functions of the lateral rods can be fully exhibited, and the motions of the vehicle body frame and the battery unit can be more synchronized.

A portion of one of the pair of extensions to which the lateral rod is attached may be curved concavely. As a result, since the concave surface of the extension receives the load from the lateral rod, the load is easily distributed. Therefore, the lateral rod can reliably transmit the supporting load of the battery unit to the cross member of the vehicle body.

The vehicle body structure further includes a pair of rear suspension brackets that are joined to the pair of floor side members and suspend the rear wheels. The pair of rear suspension brackets are arranged outside the pair of support brackets in the vehicle width direction. Good.

Since the rear suspension bracket is a bracket that suspends the rear wheel, it is fixed to the floor side member with high rigidity. Therefore, among the floor side members, the rigidity is particularly increased around the rear suspension bracket. Further, the support bracket is fixed to the floor side member and further supports the battery unit. Therefore, when torsional vibration occurs in the vehicle body, the battery unit and the support bracket move together and try to synchronize with the motion of the vehicle body by the function of the lateral rod. In the above configuration, the rear suspension bracket is arranged outside the pair of support brackets in the vehicle width direction. Therefore, the load from the lateral rod is reliably transmitted from the battery unit and the support bracket to the highly rigid floor side member as the body frame through the rear suspension bracket. Therefore, the function of the lateral rods is fully exhibited, and the motions of the vehicle body frame and the battery unit can be more synchronized.

Another representative configuration of the vehicle body structure according to one embodiment of the present invention is a vehicle body structure that includes a battery unit mounted on the vehicle body, and the vehicle body structure further includes a floor panel that constitutes the floor surface of the vehicle. a vehicle body structure comprising a pair of floor side members extending in the front-rear direction along both left and right sides of a floor panel, and a cross member bridged between the pair of floor side members on the lower side of the floor panel; A pair of flanges provided on both sides and projecting outward in the vehicle width direction, and a battery unit joined to the pair of floor side members and the pair of flanges to grip the left and right sides of the rear end of the battery unit via the pair of flanges. and a lateral rod connecting the cross member and one of the pair of flanges, the lateral rod passing through the center of the battery unit in the vehicle width direction. straddling a center line extending to the

According to the above configuration, the cross member of the vehicle body and one of the pair of flanges provided on the battery unit are connected by the lateral rod, and the lateral rod is arranged to straddle the center line of the battery unit. With this arrangement, when torsional vibration occurs in the vehicle body, the flange provided on the battery unit is pushed or pulled by the lateral rod, so that the battery unit behaves in the same manner as the vibrating vehicle body to a considerable extent. become. That is, the lateral rod has the function of synchronizing the movements of the vehicle body frame and the battery unit.

In addition, the pair of flanges provided on the battery unit protrude outward in the vehicle width direction, so the direction of the protrude almost matches the direction of the load from the lateral rod, and is closer to the floor side member, which is the body frame. in position. Therefore, the load from the lateral rod is transmitted from the flange to the support bracket, and further to the floor side members as the vehicle body frame. Therefore, according to the present invention, when torsional vibration occurs in the vehicle body on which the battery unit is mounted, excessive load is prevented from being applied to the vehicle body skeleton, noise in the cabin is reduced, and steering stability is lowered. can also be avoided.

Further, since the lateral rod is a rod-shaped member, it can be attached even if the distance in the vehicle longitudinal direction between the cross member of the vehicle body and one of the pair of flanges provided on the battery unit is reduced. Therefore, according to the above configuration, the battery unit can be extended toward the cross member, that is, toward the rear of the vehicle to increase the battery capacity, thereby increasing the cruising distance of the electric vehicle.

Still another representative configuration of the vehicle body structure according to the embodiment of the present invention is a vehicle body structure provided with a battery unit mounted on the vehicle body, the vehicle body structure further comprising a floor panel constituting a floor surface of the vehicle. a pair of floor side members extending in the front-rear direction along both left and right sides of a floor panel; and a cross member bridged between the pair of floor side members below the floor panel, wherein the pair of floor A pair of support brackets that are joined to the side members and hold the left and right sides of the rear end of the battery unit to support the battery unit in front of the cross member; a right connecting bar that connects the cross member and the rear end of the battery unit on the right side in the vehicle width direction or connects the cross member and the right support bracket on the right side of the pair of support brackets; a left connecting bar that connects the cross member and the rear end of the battery unit on the left side in the width direction or connects the cross member and the left support bracket on the left side of the pair of support brackets; Also, the closer it gets to the cross member, the closer it gets to the center line of the battery unit. and the angle formed by the left connecting bar and the cross member on the left side in the vehicle width direction is less than 45 degrees.

According to the above configuration, on the right side of the center line of the battery unit in the vehicle width direction, the right connecting bar is used to connect the cross member and the rear end of the battery unit or connect the cross member and the right support bracket. Further, on the left side of the center line of the battery unit in the vehicle width direction, a left connecting bar is used to connect the cross member and the rear end of the battery unit or connect the cross member and the left support bracket. Both the right connecting bar and the left connecting bar are inclined toward the center line of the battery unit toward the cross member, forming an angle of less than 45 degrees with respect to the cross member.

With this configuration, when torsional vibration occurs in the vehicle body, the rear end portion of the battery unit or the pair of support brackets is pushed or pulled by the right connecting bar and the left connecting bar. For this reason, the battery unit will move in the same manner as the vibrating vehicle body to a considerable extent. That is, the right connecting bar and the left connecting bar have the function of synchronizing the movements of the vehicle body frame and the battery unit to a considerable extent. Moreover, the right and left connecting bars are arranged on the right and left sides of the center line of the battery unit in the vehicle width direction, and are inclined at an angle of less than 45 degrees with respect to the cross member. can be set long. Therefore, the right connecting bar and the left connecting bar should fully exhibit their functions in either of the two directions of torsion (rotation) of the vehicle body, and better synchronize the movements of the vehicle body frame and the battery unit. can be done. Therefore, according to the present invention, when torsional vibration occurs in the vehicle body on which the battery unit is mounted, excessive load is prevented from being applied to the vehicle body skeleton, noise in the cabin is reduced, and steering stability is lowered. can also be avoided.

Further, since the right connecting bar and the left connecting bar are rod-shaped members that are inclined at an angle of less than 45 degrees with respect to the cross member, the cross member and the rear end of the battery unit or the pair of support brackets are not aligned in the longitudinal direction of the vehicle. Installation is possible even if the interval is small. Therefore, according to the above configuration, the battery unit can be extended toward the cross member, that is, toward the rear of the vehicle to increase the battery capacity, thereby increasing the cruising distance of the electric vehicle.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in these examples are merely examples for facilitating understanding of the invention, and do not limit the invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are given the same reference numerals to omit redundant description, and elements that are not directly related to the present invention are omitted from the drawings. do.

FIG. 1 is a diagram schematically showing a vehicle body structure 100 according to an embodiment of the invention. FIG. 2 is a partially enlarged view of the vehicle body structure 100 of FIG. 1 as viewed from below. In the following figures, arrows Fr and Back indicate the longitudinal direction of the vehicle, Left and Right indicate the lateral direction of the vehicle, and Up and Down indicate the vertical direction of the vehicle.

The vehicle body structure 100 is applied to a vehicle body on which the battery unit 102 shown in FIG. 1 is mounted, that is, an electric vehicle (EV vehicle). The vehicle body structure 100 includes a floor panel 104 forming a floor surface of the vehicle, a pair of floor side members 106 and 108, and a cross member 110. As shown in FIG. Floor panel 104 includes a rear floor panel 112 and a main floor panel 114 .

The rear floor panel 112 constitutes the floor surface of the rear portion of the vehicle body, and forms a downwardly recessed spare tire house 116 for accommodating a spare tire (not shown). The main floor panel 114 is positioned on the vehicle front side of the rear floor panel 112 and is joined to the rear floor panel 112 to form a floor surface on the vehicle front side of the spare tire house 116 .

The pair of floor side members 106, 108 are one of the members forming the vehicle body frame, extend in the front-rear direction along the left and right sides of the rear floor panel 112 and the main floor panel 114, and are spaced apart in the vehicle width direction. It is A pair of side sills 118 and 120 extending in the vehicle front-rear direction are arranged on the vehicle outer sides of the pair of floor side members 106 and 108, respectively.

The cross member 110 spans between the pair of floor side members 106 and 108 on the lower side of the floor panel 104 and is positioned below the boundary between the rear floor panel 112 and the main floor panel 114 here. . The cross member 110 has a body portion 122 extending in the vehicle width direction and a pair of extensions 124 and 126, as shown in FIG.

A pair of extensions 124, 126 are joined to both ends of the body portion 122 and the pair of floor side members 106, 108, respectively, and extend the body portion 122 outward in the vehicle width direction. Also, the pair of extensions 124 and 126 are made thicker, for example, and thus have higher rigidity than the main body portion 122 . Furthermore, the pair of extensions 124, 126 are located outside the main body portion 122 of the cross member 110 in the vehicle width direction, and therefore are closer to the pair of floor side members 106, 108, which are the vehicle body skeleton.

Here, in an electric vehicle, by securing a sufficient installation space for the battery unit 102, the battery capacity can be increased and the cruising distance can be extended. On the other hand, when torsional vibration occurs in the vehicle body on which the battery unit 102 is mounted, the battery unit 102 is a heavy object with a large inertial weight, so it does not follow the vibrating (moving) vehicle body, and the movement different from that of the vehicle body skeleton. I do. As a result, a relative rotational deviation occurs between the battery unit 102 and the vehicle body frame in the vehicle body, and excessive load (for example, shear stress) is applied to the vehicle body frame, noise is generated in the cabin, and steering stability is lowered. There was a possibility of

Therefore, in the vehicle body structure 100, a configuration is adopted in which the movements of the vehicle body skeleton and the battery unit 102 can be synchronized to a considerable extent when torsional vibration occurs in the vehicle body. That is, the vehicle body structure 100 further includes lateral rods 128 . Lateral rod 128 connects rear end portion 130 of battery unit 102 with cross member 110 spanned between a pair of floor side members 106 and 108 as a vehicle body frame, as shown in FIG. The lateral rod 128 straddles the center line A of the battery unit 102 while connecting the cross member 110 and the rear end portion 130 of the battery unit 102 . Center line A extends in the vehicle front-rear direction through the center of battery unit 102 in the vehicle width direction.

The vehicle body structure 100 further includes a pair of flanges 132, 134, a pair of support brackets 136, 138, and a pair of rear suspension brackets 140, 142 shown in FIG. The pair of flanges 132, 134 are provided on both left and right sides of the battery unit 102, project outward in the vehicle width direction, and are positioned closer to the pair of floor side members 106, 108, which are the body frame. Also, since the pair of flanges 132 and 134 are provided on the battery unit 102, they move integrally with the battery unit 102 when torsional vibration occurs in the vehicle body.

A pair of support brackets 136,138 are joined to the pair of floor side members 106,108 and the pair of flanges 132,134. The pair of support brackets 136 and 138 grips the left and right sides of the rear end portion 130 of the battery unit 102 via the pair of flanges 132 and 134, and holds the battery unit 102 below the main floor panel 114 and in front of the cross member 110. to support. Also, since the pair of support brackets 136 and 138 support the battery unit 102, they move integrally with the battery unit 102 together with the pair of flanges 132 and 134 when torsional vibration occurs in the vehicle body.

A pair of rear suspension brackets 140 and 142 are brackets for suspending rear wheels (not shown), and are fixed to a pair of floor side members 106 and 108 with high rigidity.
Therefore, the rigidity of the pair of floor side members 106, 108 around the pair of rear suspension brackets 140, 142 is particularly enhanced. 2, the pair of rear suspension brackets 140 and 142 are arranged outside the pair of support brackets 136 and 138 in the vehicle width direction, that is, outside the rear end portion 130 of the battery unit 102 in the vehicle width direction. there is

FIG. 3 is a view of the vehicle body structure 100 in FIG. FIG. 4 is a C arrow view of the vehicle body structure 100 of FIG. The lateral rod 128 is a rod-shaped member, and mounting brackets 144 and 146 are attached to both ends thereof (see FIG. 2).

A mounting bracket 144 for the lateral rod 128 shown in FIG. 3 is mounted and fixed to a corner portion 148 of the rear end portion 130 of the battery unit 102 near the flange 132 from below with a bolt or the like. A mounting bracket 146 for the lateral rod 128 shown in FIG. 4 is mounted and fixed to the extension 126 of the cross member 110 at a position closer to the floor side member 108 from below with a bolt or the like. As shown in FIG. 4, the extension 126 is curved in a concave shape, that is, in a convex shape toward the upper side of the vehicle.

In this manner, lateral rod 128 can be easily fixed with bolts or the like by accessing rear end portion 130 of battery unit 102 and extension 126 of cross member 110 from below. Further, lateral rod 128, which is a bar-shaped member, can be attached even if the distance between rear end portion 130 of battery unit 102 and extension 126 of cross member 110 in the vehicle front-rear direction is reduced. Therefore, in the vehicle body structure 100, the battery unit 102 can be extended toward the cross member 110, that is, toward the rear of the vehicle to increase the battery capacity, thereby increasing the cruising distance of the electric vehicle.

In addition, the vehicle body structure 100 does not employ a configuration in which the battery unit 102 and the pair of floor side members 106 and 108 are connected by appropriate members extending in the vehicle width direction. Therefore, in the vehicle body structure 100, there is no need to secure a space for arranging members extending in the vehicle width direction, so the battery capacity can be secured without reducing the size of the battery unit 102 in the vehicle width direction.

Further, the battery unit 102 is mounted on the vehicle body after the attachment bracket 144 of the lateral rod 128 is previously attached to the corner portion 148 . After mounting the battery unit 102 on the vehicle body, the attachment bracket 146 of the lateral rod 128 is attached to the extension 126 . Thus, in the vehicle body structure 100 , the lateral rods 128 can be attached to the rear end portion 130 of the battery unit 102 and the extensions 126 of the cross member 110 while the battery unit 102 is mounted on the vehicle body.

Next, the behavior of the vehicle body structure 100 when torsional vibration occurs in the vehicle body will be described. When torsional vibration occurs in the vehicle body, the extension 126 of the cross member 110 of the vehicle body to which the lateral rod 128 is attached pushes or pulls the lateral rod 128 in accordance with the torsional vibration of the vehicle body. The rear end 130 of the battery unit 102 is accordingly pushed or pulled by the lateral rod 128, so that the battery unit 102 behaves to a large extent like the vibrating vehicle body.

In other words, the lateral rods 128 support the battery unit 102 and reliably transmit the supporting load to the vehicle body frame, so that when torsional vibration occurs in the vehicle body, the motion of the vehicle body frame and the battery unit 102 is synchronized to a considerable extent. It has a function to let By attaching the lateral rod 128 to the extension 126 located closer to the floor side member 108, the length of the lateral rod 128 can be set longer. Furthermore, the extension 126 has higher rigidity than the body portion 122, and is joined to the floor side member 108, which is the vehicle body frame. Therefore, the load from the lateral rod 128 is easily transmitted to the vehicle body frame via the extension 126, and the motions of the vehicle body frame and the battery unit 102 can be more synchronized.

In addition, since the extension 126 is concavely curved, the load from the lateral rod 128 is received by the concave surface of the extension 126, and the load is easily dispersed. Therefore, lateral rod 128 can reliably transmit the supporting load of battery unit 102 to cross member 110 of the vehicle body.

Further, in the vehicle body structure 100, rear suspension brackets 140 and 142 with high rigidity are arranged outside the rear end portion 130 of the battery unit 102 in the vehicle width direction and outside the support brackets 136 and 138 in the vehicle width direction, respectively. Therefore, the load from the lateral rod 128 is reliably transmitted to the floor side members 106, 108 as the vehicle body frame via the support brackets 136, 138 and the rear suspension brackets 140, 142.

Therefore, in the vehicle body structure 100, the function of the lateral rods 128 is fully exhibited, so that the movements of the vehicle body skeleton and the battery unit 102 can be more synchronized when torsional vibration occurs in the vehicle body. As a result, in the vehicle body structure 100, it is possible to prevent excessive load from being applied to the vehicle body skeleton, reduce noise in the vehicle interior, and further avoid deterioration of steering stability.

In vehicle body structure 100 , cross member 110 and rear end portion 130 of battery unit 102 are connected by lateral rod 128 , but the present invention is not limited to this. As an example, as shown by the phantom line D in FIG. 3, the lateral rod 128 is extended rightward in the vehicle width direction, and instead of the rear end portion 130 of the battery unit 102, the lateral rod 128 is attached to the flange 132 or the support bracket 136. may

A flange 132 is provided on the battery unit 102 and is also joined to a support bracket 136 . Therefore, the flange 132 and the support bracket 136 move integrally with the battery unit 102 when torsional vibration occurs in the vehicle body. Furthermore, since the flange 132 protrudes outward in the vehicle width direction, the direction in which the flange 132 protrudes substantially matches the direction of the load from the lateral rod 128 .

Therefore, when the vehicle body undergoes torsional vibration, the flange 132 or the support bracket 136 is pushed or pulled by the lateral rod, so that the battery unit 102 behaves to a large extent in the same manner as the vibrating vehicle body. . That is, the lateral rods 128 can coordinate the movements of the vehicle frame and the battery unit 102 even when attached to the flanges 132 or the support brackets 136 .

As another example, extension 124 (see FIG. 3) of cross member 110 and corner 149 (see FIG. 4) of rear end portion 130 of battery unit 102 may be connected by lateral rod 128 . Extension 124 is positioned closer to floor side member 106 than cross member 110 . A corner portion 149 of the rear end portion 130 of the battery unit 102 is located near the flange 134 . Therefore, in lateral rod 128 , mounting bracket 144 is attached to extension 124 and mounting bracket 146 is attached to corner 149 of rear end 130 of battery unit 102 . As still another example, lateral rod 128 connecting extension 124 of cross member 110 and corner 149 of battery unit 102 may extend leftward in the vehicle width direction. Lateral rod 128 may be attached to flange 134 or support bracket 138 instead of rear end portion 130 of battery unit 102 . Even with the lateral rod 128 according to such another example, it is possible to synchronize the movements of the vehicle body frame and the battery unit 102 when torsional vibration occurs in the vehicle body.

FIG. 5 is a diagram schematically showing a vehicle body structure 100A according to another embodiment of the invention. In the vehicle body structure 100A, two connecting bars, a right connecting bar 150 and a left connecting bar 152, are used to connect the cross member 110 and the rear end portion 130 of the battery unit 102, respectively, as shown.

Right connecting bar 150 is attached to rear end portion 130 of battery unit 102 at attachment point E located on the right side of center line A of battery unit 102 in the vehicle width direction. The right connecting bar 150 is attached to the cross member 110 at an attachment point F located on the right side of the center line A in the vehicle width direction. Furthermore, right connecting bar 150 is inclined with respect to cross member 110 so as to approach center line A of battery unit 102 as it approaches cross member 110 . Of the angles formed by the right connecting bar 150 and the cross member 110, the angle θa on the right side in the vehicle width direction is less than 45 degrees.

The left connecting bar 152 is attached to the rear end portion 130 of the battery unit 102 at an attachment point G located on the left side of the center line A of the battery unit 102 in the vehicle width direction. The left connecting bar 152 is attached to the cross member 110 at an attachment point H located on the left side of the center line A in the vehicle width direction. Furthermore, the left connecting bar 152 is inclined with respect to the cross member 110 so as to approach the center line A of the battery unit 102 as it approaches the cross member 110 . Of the angles formed by the left connecting bar 152 and the cross member 110, the left angle θb in the vehicle width direction is less than 45 degrees.

In such a vehicle body structure 100A, the rear end portion 130 of the battery unit 102 is pushed or pulled by the right connecting bar 150 and the left connecting bar 152 when torsional vibration occurs in the vehicle body. Therefore, the battery unit 102 moves in the same manner as the vibrating vehicle body to a considerable extent. That is, the right connecting bar 150 and the left connecting bar 152 have the function of synchronizing the movements of the vehicle body frame and the battery unit 102 to a considerable extent. Moreover, the right connecting bar 150 and the left connecting bar 152 are arranged on the vehicle width direction right side and the vehicle width direction left side of the center line A of the battery unit 102, and are arranged at an angle θa and an angle θb of less than 45 degrees with respect to the cross member 110. Since it is slanted, its length can be set long.

Therefore, the right connecting bar 150 and the left connecting bar 152 fully exhibit their functions in either of the two directions of torsion (rotation) of the vehicle body, and the movement between the vehicle body frame and the battery unit 102 is further enhanced. can be synchronized. Therefore, according to the vehicle body structure 100A, when torsional vibration occurs in the vehicle body, it is possible to prevent an excessive load from being applied to the vehicle body skeleton, reduce the noise in the cabin, and avoid deterioration in steering stability.

Furthermore, the right connecting bar 150 and the left connecting bar 152 are bar-shaped members that are inclined at an angle of less than 45 degrees with respect to the cross member 110 . Therefore, right connecting bar 150 and left connecting bar 152 can be attached even if the distance between cross member 110 and rear end portion 130 of battery unit 102 in the vehicle front-rear direction is reduced. Therefore, according to the vehicle body structure 100A, the battery unit 102 can be extended toward the cross member 110, that is, toward the rear of the vehicle to increase the battery capacity, thereby increasing the cruising distance of the electric vehicle.

As an example, the right connecting bar 150 extends to the right in the vehicle width direction so that instead of the rear end portion 130 of the battery unit 102, the flange 132 or It may be attached to the support bracket 136 . Further, the left connecting bar 152 extends to the left in the vehicle width direction so that instead of the rear end portion 130 of the battery unit 102, a flange 134 or a support bracket 138 located on the left side in the vehicle width direction of the center line A shown in FIG. may be attached to the Even in such a case, the right connecting bar 150 and the left connecting bar 152 can synchronize the movements of the vehicle body frame and the battery unit 102 .

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is obvious that a person skilled in the art can conceive of various modifications or modifications within the scope described in the claims, and these also belong to the technical scope of the present invention. Understood.

INDUSTRIAL APPLICABILITY The present invention can be used for vehicle body structures.

DESCRIPTION OF SYMBOLS 100, 100A... Vehicle body structure 102... Battery unit 104... Floor panel 106, 108... Floor side member 110... Cross member 112... Rear floor panel 114... Main floor panel 116... Spare tire house 118, 120 Side sill 122 Body portion of cross member 124, 126 Extension 128 Lateral rod 130 Rear end portion of battery unit 132, 134 Flange 136, 138 Support bracket 140, 142 Rear suspension Brackets 144, 146... Mounting brackets for lateral rods 148, 149... Corners of battery unit 150, 152... Connecting bars

Claims (6)

A vehicle body structure including a battery unit mounted on the vehicle body,
The vehicle body structure further
a floor panel that constitutes the floor of the vehicle;
a pair of floor side members extending in the front-rear direction along both left and right sides of the floor panel;
A vehicle body structure comprising a cross member that spans between the pair of floor side members on the lower side of the floor panel,
a pair of support brackets that are joined to the pair of floor side members and hold both left and right sides of the rear end portion of the battery unit to support the battery unit in front of the cross member;
a lateral rod connecting the cross member and the rear end of the battery unit or connecting the cross member and one of the pair of support brackets;
The vehicle body structure, wherein the lateral rod straddles a center line extending in the longitudinal direction of the vehicle through the center of the battery unit in the vehicle width direction. The cross member is
A body portion extending in the vehicle width direction, and a pair of extensions having higher rigidity than the body portion and extending the body portion outward in the vehicle width direction by being joined to both ends of the body portion and the pair of floor side members, respectively. death,
2. The vehicle body structure according to claim 1, wherein said lateral rod is attached to either one of said pair of extensions. 3. The vehicle body structure according to claim 2, wherein a portion of one of the pair of extensions to which the lateral rod is attached is curved in a concave shape. The vehicle body structure further comprises a pair of rear suspension brackets joined to the pair of floor side members and suspending rear wheels,
The vehicle body structure according to any one of claims 1 to 3, wherein the pair of rear suspension brackets are arranged outside the pair of support brackets in the vehicle width direction. A vehicle body structure including a battery unit mounted on the vehicle body,
The vehicle body structure further
a floor panel that constitutes the floor of the vehicle;
a pair of floor side members extending in the front-rear direction along both left and right sides of the floor panel;
A vehicle body structure comprising a cross member that spans between the pair of floor side members on the lower side of the floor panel,
a pair of flanges provided on both left and right sides of the battery unit and projecting outward in the vehicle width direction;
A pair of support brackets that are joined to the pair of floor side members and the pair of flanges and hold the left and right sides of the rear end of the battery unit via the pair of flanges to support the battery unit in front of the cross member. When,
a lateral rod connecting the cross member and one of the pair of flanges;
The vehicle body structure, wherein the lateral rod straddles a center line extending in the longitudinal direction of the vehicle through the center of the battery unit in the vehicle width direction. A vehicle body structure including a battery unit mounted on the vehicle body,
The vehicle body structure further
a floor panel that constitutes the floor of the vehicle;
a pair of floor side members extending in the front-rear direction along both left and right sides of the floor panel;
A vehicle body structure comprising a cross member that spans between the pair of floor side members on the lower side of the floor panel,
a pair of support brackets that are joined to the pair of floor side members and hold both left and right sides of the rear end portion of the battery unit to support the battery unit in front of the cross member;
The cross member and the rear end portion of the battery unit are connected on the vehicle width direction right side of a center line extending in the vehicle longitudinal direction through the vehicle width direction center of the battery unit, or the cross member and the pair of support brackets are connected. A right connecting bar that connects the right support bracket on the right side,
A left connecting bar that connects the cross member and the rear end portion of the battery unit on the left side of the center line of the battery unit in the vehicle width direction or connects the cross member and the left support bracket on the left side of the pair of support brackets. and
Both the right connecting bar and the left connecting bar are inclined with respect to the cross member so as to approach the center line of the battery unit as they approach the cross member,
Of the angles formed by the right connecting bar and the cross member, the angle on the right side in the vehicle width direction is less than 45 degrees,
The vehicle body structure, wherein the angle formed by the left connecting bar and the cross member on the left side in the vehicle width direction is less than 45 degrees.

Images