JPH0528789U - Lower car body structure - Google Patents

Abstract

(57) [Abstract] [Purpose] When a battery is laid out on a panel member that connects a side sill and front and rear frames located inside the vehicle body with respect to the side sill, it is possible to mitigate an increase in battery temperature during vehicle travel. A lower body structure of an automobile is provided. [Structure] A battery BT is placed on a battery tray 31 that connects the side sill 7 and the floor frame 13, and the side sill 7 is provided on the lower surface side of the battery tray 31.
And the floor frame 13 are connected to each other to connect the battery tray 31.
And a battery bracket 32 that forms a closed cross-section space 33 is provided, and a baffle plate 35 that forms a closed cross-section space 36 is formed below the battery bracket 32 and the battery tray 31. It is characterized in that both ends of the closed cross-section space 36 in the vehicle front-rear direction are opened.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lower body structure of an automobile, and more particularly to a lower body structure of an automobile in which a battery is disposed on a panel member that connects a side sill and front and rear frames located inside the side sill.

[0002]

[Prior Art]

 As is well known, when a battery of an automobile is mounted on the vehicle body side, it is conventionally common to dispose it in an engine room in the front portion of the vehicle body (for example, see Japanese Utility Model Laid-Open No. 2-56088). The battery life is greatly affected by the temperature, and the higher the ambient temperature, the shorter the battery life.Therefore, when laying out the battery in the engine room, it should be located as far as possible from the engine and its exhaust system, which are high-temperature heat sources. It is desirable to install in the engine room, and various measures have been taken in order to perform a suitable layout in the engine room, where space is scarce.

By the way, in an automobile such as a one-box type vehicle for carrying a large number of passengers or carrying a relatively large load, an engine, a transmission, etc. are provided in order to secure a wider vehicle compartment or luggage space. A layout has been widely adopted in which a power train composed of is mounted on the front part of the vehicle body and a front seat is arranged above the power train. In this case, the front part of the floor panel is raised by a predetermined amount from the subsequent rear part, and the power train is arranged below this step, while the front seat is arranged above the step. By doing so, it is possible to expand the vehicle compartment or luggage space while avoiding raising the overall floor of the vehicle compartment.

Further, when the above-mentioned layout is adopted, side sills extending in the vehicle front-rear direction at both left and right ends of the vehicle body, and a frame member (floor frame) extending in the vehicle front direction inward of the side sills are provided. By connecting the panels with a panel member and placing the battery on the panel member, it is possible to lay out the battery below the raised portion of the floor panel.

[0005]

[Problems to be solved by the device]

 However, even when the battery is laid out as described above, the exhaust gas extending from the engine side toward the rear of the vehicle body is relatively close to the battery, such as inside the vehicle body of the floor frame or below the panel member. The system may be laid out, and in such a case, it is necessary to effectively mitigate the rise in battery temperature due to the thermal effect of the exhaust system, which reaches a high temperature while the vehicle is running.

Therefore, in the present invention, when the battery is laid out on the panel member that connects the side sill and the front and rear frames positioned inside the side sill with respect to the side sill, a rise in the battery temperature during traveling of the vehicle is mitigated. The purpose of the invention is to provide a lower body structure of an automobile that can be used.

[0007]

[Means for Solving the Problems]

 Therefore, a first invention of the present application is to provide a vehicle lower body structure in which a battery is disposed on a panel member that connects a side sill and a frame member that is disposed inward of the side sill and extends in the front-rear direction. In the above, the baffle plate that forms a closed cross-section space with the panel member is arranged on the lower surface side of the panel member, and both ends of the closed cross-section space in the vehicle front-rear direction are open. It is a thing.

A second invention of the present application is characterized in that, in the first invention, an exhaust system of the engine is arranged in the vicinity of the baffle plate.

Further, a third invention of the present application is the same as the first or second invention, wherein a reinforcing member for connecting the side sill and the frame member is disposed on the lower surface side of the panel member, and the reinforcing member is provided. It is characterized in that a double closed cross-section space is formed by the member, the panel member and the baffle plate.

[0010]

[Effect of the device]

 According to the first invention of the present application, a baffle plate is arranged on the lower surface side of the panel member to form a closed cross sectional space, and both ends of the closed cross sectional space in the vehicle front-rear direction are open. Thus, when the vehicle is traveling, the battery can be effectively cooled by the traveling wind blowing through the space of the closed cross section, effectively suppressing the increase in the battery temperature during traveling and extending its life. Can be improved.

According to a second invention of the present application, in the first invention, the exhaust system of the engine is arranged near the baffle plate, so that the vehicle is running. It is possible to effectively mitigate the rise in battery temperature due to the heat effect of the exhaust system reaching a high temperature.

Further, according to a third invention of the present application, in the first or second invention, the reinforcing member is disposed on the lower surface side of the panel member, and the reinforcing member, the panel member, and the wind guide are provided. Since a double closed cross-sectional space is formed with the plate, it is possible to reinforce the panel member and improve its rigidity, and the exhaust system is placed near the panel member, especially near the lower part. In this case, in addition to the cooling effect by the running wind, a high heat insulating effect can be obtained by providing the double air layer, and the increase in battery temperature due to the heat effect from the exhaust system is more effective. Can be relaxed.

[0013]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view for explaining the floor and frame structure of the front part of the vehicle body of, for example, a one-box type automobile according to this embodiment. As shown in FIG. The side portion 3 (front floor panel) is stepped up from the succeeding rear side portion 4 (rear floor panel) by a predetermined amount. Below the raised front floor panel 3, the engine and the transmission are configured. Most of the power train (not shown) is arranged, and a front seat (not shown) is arranged above the front floor panel 3.

The front floor panel 3 is formed by cutting out a substantially rectangular front portion in the center in the vehicle width direction into a substantially rectangular shape, and the rear portion of the cutout portion 3h is covered by a box-shaped cover body 6 (engine cover). The engine cover 6 accommodates an upper portion of an engine (not shown) and engine accessories. The rear side of the engine cover 6 is covered with a cover panel (not shown). A cowl box 5 is arranged above the front portion of the engine cover 6.

Further, side sills 7 extending in the vehicle front-rear direction are arranged at the left and right side ends of the vehicle body, and the left and right side ends of the passenger compartment floor panels 3 and 4 are supported by the side sills 7 and 7. Has been done. The side sill 7 extends forward along the floor panel 4 on the rear side substantially corresponding to the side surface shape of the passenger compartment floor, and then is raised to the height of the front floor panel 3 near the hinge pillar 8. , The height of the dash panel 9 is extended, and the dash panel 9 is extended further forward. A front wheel house 10 having a lower end of the cowl side panel 11 and an upper edge portion of a side end is formed in front of a portion of the side sill 7 which rises obliquely upward.

The starting point of the rising portion of the side sill 7 is located in front of the starting point of the raised portion of the passenger compartment floor (that is, the front floor panel 3), and the front floor panel 3 is located between these starting points. There is a step between the side sill 7 and the side sill 7. In this part, foot steps 12 are provided on both left and right sides of the front floor panel 3 for a front passenger to get in and out, and the left and right ends of the front floor panel 3 are connected to the side sills 7, 7 through the foot steps 12. Are connected and supported by.

Further, a pair of left and right frame members 13 (floor frames) extending inward from the side sills 7 and 7 toward the front and rear of the vehicle body are provided at the front portion of the vehicle body. In this embodiment, the floor frames 13, 13 are connected to the front floor panel 3 not by direct attachment but by a panel member 14 (vertical wall) arranged vertically. That is, the lower surface side of the front floor panel 3 is joined with the upper end portion of a vertical wall 14 that is hung downward and extends in the vehicle front-rear direction, and the floor frame 13 is joined to the lower end side of the vertical wall 14. There is.

By connecting the floor frame 13 to the lower surface side of the front floor panel 3 via the vertical walls 14 and 15 as described above, while securing the bonding strength of the floor frame 13 to the front floor panel 3, Since the floor frame 13 can be laid out downward by the height of each vertical wall 14, 15, and since the vertical walls 14, 14 and 15, 15 can serve as reinforcing ribs for the front floor panel 3, It is possible to improve the floor rigidity of the vehicle body and improve the strength or shock absorption in the case of a frontal collision of the vehicle.

A box body 20 (so-called torque box) having a closed cross section is provided on the front side of the foot step 12 as a reinforcing body that connects the side sill 7 and the front frame 13. The torque box 20 includes two substantially parallel panel members 21 and 22 arranged in the vehicle width direction between the inner member (side sill inner) of the side sill 7 and the floor frame 13 and the vertical wall 14. A bottom plate 23 is provided which joins the lower end portions of both panel members 21 and 22 with each other while the left and right end portions of both panel members 21 and 22 and the bottom plate 23 are connected to the inner member of the side sill 7 and the floor frame 13 and. And the vertical wall 14 respectively. The torque box 20 is located on the front side of the footstep 12, that is, on the rear side of the wheel house 11 that houses the front wheel tire. The torque boxes 20 are formed on the front sides of the left and right footsteps 12, respectively.

By providing a pair of left and right high-rigidity torque boxes 20 having a closed cross-section as described above on the lower surface side of the front floor panel 3, the vehicle body rigidity and strength in the front part of the vehicle body of the above-mentioned automobile can be improved. When the vehicle collides head-on, the collision load input to the front frame 13, for example, is distributed to the side sill 7 side while the vehicle receives a side collision. In addition, the collision load input to the side sill 7 can be dispersed to the front frame 13 side to improve the proof stress of the entire vehicle.

In the present embodiment, for example, the battery BT is arranged behind the right torque box 20, that is, inside the right foot step 12 (the vehicle compartment side), and the vehicle interior side of the battery BT is the vertical direction. It is separated by the wall 14. That is, as shown in detail in FIGS. 2 and 3, inside the foot step 12, the battery tray 31 as the panel member 31 that connects the inner member 7b (side sill inner) of the side sill 7 and the lower end side of the floor frame 13 The battery BT is placed on the upper surface of the battery tray 31. It should be noted that in a vehicle for cold regions, two batteries BT are mounted.

On the other hand, on the inner side of the floor frame 13 with respect to the vehicle body, an engine exhaust pipe Pex is arranged between the transmission Tm and the vehicle front and rear direction, and is relatively close to the battery BT of the exhaust pipe Pex. A catalyst device CT is attached to the portion, and an insulator 29 covers the upper part of the catalyst device CT. An opening 28h for maintenance of the battery BT is formed in the side plate 28 of the foot step 12, and the opening 28h is normally closed by a cover panel 28.

Further, in this embodiment, a battery bracket 32 for reinforcing the battery tray 31 is arranged on the lower surface side of the battery tray 31. The left and right ends of the battery bracket 32 are respectively joined to the outer surface of the floor frame 13 and the inner member 7b of the side sill 7 so as to connect them to each other, and have a closed cross section space 33. Further, below the battery bracket 32, a baffle plate 35 that forms a closed cross-section space 36 with the battery tray 31 and the battery bracket 32 is arranged.

The baffle plate 35 has its central portion in the vehicle width direction joined to the battery tray 31 and the battery bracket 32 by a plurality of protrusions 35b arranged in the vehicle front-rear direction, and the left end side thereof. Is joined to the outer surface of the floor frame 13 and the left end side of the battery bracket 32, and its right end side is joined to the side sill inner 7b and the right end side of the battery bracket 32. Further, the baffle plate 35 is provided with a drain hole 35h for discharging water when it enters the battery tray 31 side or discharging warmed gas on the battery tray 31 side. Water or warm gas that has entered the battery tray 31 passes through gaps Cr, ..., Cr (see FIG. 3) between the rising portions 32b, 32b on the left side of the battery bracket 32 and the battery tray 31. After being discharged to the closed cross-section space 36 side, it is discharged to the outside through the drain hole 35h.

By disposing the battery bracket 32 and the baffle plate 35 on the lower surface side of the battery tray 31, a closed cross section space 33 and a closed cross section space 36 therebelow are formed in the portion where the battery bracket 32 is joined. The double closed cross-section space is formed by. As shown in FIG. 4, both ends of the closed cross-section space 36 in the front-rear direction of the vehicle body are open, and when the vehicle is running, the running wind that bypasses the lower side of the torque box 20 creates the above-mentioned closed cross-section space 36. It is designed to blow through to the rear side of the car body. In FIG. 4, reference numerals 41 and 42 denote panel members that support the front end and the rear end of the battery tray 31 and are connected to the floor panel 3.

With the above configuration, when the vehicle is traveling, the traveling wind blows through the closed cross-section space 36, whereby the battery BT can be effectively cooled, and the temperature rise of the battery BT during traveling can be prevented. Can be effectively mitigated. In particular, even when the exhaust pipe Pex and the catalyst device CT, which reach a high temperature while the vehicle is traveling, are laid out relatively close to each other, it is possible to effectively mitigate the temperature rise of the battery BT due to the heat effect thereof, and the battery BT The life of the can be improved. Further, since the battery bracket 32 is disposed on the lower surface side of the battery tray 31, and the battery bracket 32, the battery tray 31, and the baffle plate 35 form the double closed cross-section spaces 33 and 36, The battery tray 31 can be reinforced to improve its rigidity. Furthermore, due to the air layer in the closed cross-section space 33 of the battery bracket 32 (closed-surface space 33 of the left rising portions 32b, 32b) on the side where the exhaust pipe Pex and the catalyst device CT are arranged. The heat insulating effect can be obtained, and the temperature increase of the battery BT due to the heat effect from the exhaust pipe Pex and the catalyst device CT can be more effectively mitigated together with the cooling effect by the traveling wind. In particular, when the exhaust system is arranged below the battery tray, a double air layer is provided between the battery and the exhaust system, which further effectively increases the temperature of the battery. Can be relaxed.

As shown in FIG. 5, by extending the left rising portion 52b of the battery bracket 52 upward and joining the upper end portion 52a thereof to the lower surface of the floor panel 3, the battery tray 31 is made stronger. It is possible to improve the torsional rigidity of the vehicle body, and it is possible to effectively restrict the movement of the side seal 7 inward of the vehicle body when the vehicle receives a side collision. .. Moreover, since the height of the left rising portion 52b of the battery bracket 52 is high and the volume thereof is large, the heat insulation effect against the heat influence from the exhaust pipe Pex and the catalyst device CT can be further enhanced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a floor and a frame structure of a vehicle front lower part of an automobile according to an embodiment of the present invention.

FIG. 2 is a cross-sectional explanatory view in the AA direction of FIG.

FIG. 3 is a perspective view showing a battery arrangement structure according to the present embodiment.

FIG. 4 is a side view illustrating a flow of traveling wind below the battery.

FIG. 5 is a cross-sectional view showing the arrangement structure of a battery according to another embodiment of the present invention.

[Explanation of symbols]

 7 ... Side sill 13 ... Floor frame 31 ... Battery tray 32 ... Battery bracket 33, 36 ... Closed sectional space 35 ... Baffle plate BT ... Battery CT ... Catalyst device Pex ... Exhaust pipe

Claims (3)

[Scope of utility model registration request] 1. A lower vehicle body structure for an automobile, wherein a battery is mounted on a panel member that connects a side sill and a frame member that is disposed inward of the vehicle with respect to the side sill and extends in the front-rear direction. A lower vehicle body structure for an automobile, wherein a baffle plate that forms a closed cross-section space with the panel member is disposed on the lower surface side, and both ends of the closed cross-section space in the vehicle front-rear direction are open. 2. The lower vehicle body structure of the automobile according to claim 1, wherein an exhaust system of the engine is arranged near the air guide plate. 3. A reinforcing member that connects the side sill and the frame member is disposed on the lower surface side of the panel member, and a double closed cross-section space is formed by the reinforcing member, the panel member, and the baffle plate. The lower body structure for an automobile according to claim 1 or 2, wherein the lower body structure is formed.