JP7276227B2 - vehicle undercarriage - Google Patents

Description

The present invention relates to a vehicle undercarriage.

An engine and a drive motor are arranged as drive sources on the front side of the vehicle, and a propeller shaft is arranged below a floor panel that forms the floor surface of the passenger compartment. Hybrid vehicles are known which transmit power to drive wheels arranged on the side.

In the hybrid vehicle, a plurality of battery modules for storing electric power to be supplied to the drive motor are connected to form a battery unit, and the battery units are arranged below the floor panel on both sides of the propeller shaft in the vehicle width direction. is also known (see, for example, Patent Document 1).

Japanese Patent No. 5483293

In a hybrid vehicle in which first and second battery units are arranged below the floor panel on both sides of the propeller shaft in the vehicle width direction, high-voltage components such as inverters connected to the first and second battery units are placed below the floor panel. are located near the first and second battery units. Further, when the engine is arranged on the front side of the vehicle, an exhaust system component such as a catalytic device for purifying the exhaust gas of the engine may be arranged below the floor panel.

When high-voltage components and exhaust system components are arranged below the floor panel, the floor panel is limited in order to ensure the battery capacity of the first and second battery units arranged on both sides of the propeller shaft in the vehicle width direction. It is required to be compactly arranged in the vehicle front-rear direction in the space below the vehicle. However, if the exhaust system parts are arranged in the vicinity of the high voltage parts, the heat of the exhaust system parts may be transferred to the high voltage parts, causing heat damage to the high voltage parts.

Accordingly, the present invention provides a vehicle in which first and second battery units are arranged on both sides of a propeller shaft in the vehicle width direction below a floor panel, and high voltage components and exhaust system components are compactly arranged below the floor panel. It is another object of the present invention to provide a vehicle lower structure capable of suppressing heat damage to high-voltage components due to exhaust system components.

In order to solve the above problems, the inventors of the present application have proposed a vehicle in which first and second battery units are arranged on both sides of the propeller shaft in the vehicle width direction below the floor panel, and high-voltage components and Extensive studies have been made on the configurations of the high-voltage components and the exhaust system components while considering the thermal effects of the exhaust system components on the battery unit and the high-voltage components for various engine conditions when the exhaust system components are arranged. As a result, the present inventors have found a configuration capable of compactly arranging the high-voltage components and the exhaust system components and suppressing the heat damage of the high-voltage components caused by the exhaust system components, thereby completing the present invention.

The present invention comprises a drive source having an engine and a drive motor, a floor panel forming a floor surface of a vehicle compartment, and extending in the longitudinal direction of the vehicle below the floor panel to transmit power from the drive source to drive wheels. a propeller shaft, the first battery unit being spaced apart from the propeller shaft on both sides in the vehicle width direction below the floor panel and storing electric power to be supplied to the drive motor; a second battery unit; a high voltage component connected to the first battery unit and the second battery unit; and an exhaust system component of the engine, wherein the high voltage component and the exhaust system component are connected to the floor Provided is a lower structure of a vehicle, which is arranged on the front side of the vehicle from the first battery unit and the second battery unit below the panel, and is spaced apart on one side and the other side in the vehicle width direction.

According to the present invention, the first and second battery units are arranged below the floor panel on both sides of the propeller shaft in the vehicle width direction, the high-voltage components connected to the first and second battery units, and the exhaust of the engine. system components. The high-voltage components and the exhaust system components are arranged on the front side of the vehicle from the first and second battery units below the floor panel and spaced apart on one side and the other side in the vehicle width direction.

As a result, in a vehicle in which the first and second battery units are arranged on both sides of the propeller shaft in the vehicle width direction below the floor panel, the high-voltage components and the exhaust system components are positioned closer to the front of the vehicle than the first and second battery units. Since they are arranged separately on both sides in the vehicle width direction, they can be arranged more compactly in the vehicle front-rear direction than in the case where they are arranged in the vehicle front-rear direction. Since the high-voltage parts and the exhaust system parts are spaced apart on both sides in the vehicle width direction, it is possible to suppress the heat transfer of the exhaust system parts to the high-voltage parts under various engine conditions. It is possible to suppress heat damage to high-voltage components due to

Therefore, in a vehicle in which the first and second battery units are arranged on both sides of the propeller shaft in the vehicle width direction below the floor panel, the high-voltage parts and the exhaust system parts are compactly arranged below the floor panel and the exhaust system It is possible to suppress heat damage to high-voltage components caused by the components.

It is preferable that the high-voltage component is arranged at a position overlapping at least a part of the exhaust system component in the vehicle front-rear direction when viewed from the side of the vehicle.

With this configuration, the high-voltage components and the exhaust system components can be configured compactly in the longitudinal direction of the vehicle. Compared to the case where the high-voltage components do not overlap at least a part of the exhaust system components in the longitudinal direction of the vehicle, the high-voltage components and the exhaust system components are compactly arranged in the limited space below the floor panel. , the first and second battery units can be made larger in the longitudinal direction of the vehicle to increase the battery capacity.

It is preferable that an exhaust pipe extending from the engine and in which the exhaust system component is disposed is provided, and the exhaust pipe is disposed downstream of the exhaust system component below the propeller shaft.

With this configuration, since the exhaust pipe is arranged below the propeller shaft, the first and second battery units are formed so as to avoid the exhaust pipe, which reduces the battery capacities of the first and second battery units. can be suppressed.

A transmission connected to an engine may be connected to the vehicle front side of the propeller shaft, and the high-voltage component and the exhaust system component may be spaced apart on both sides of the transmission in the vehicle width direction.

With this configuration, it is possible to suppress the transmission of heat from the exhaust system parts to the high voltage parts by the transmission arranged between the high voltage parts and the exhaust system parts, thereby preventing heat damage to the high voltage parts due to the exhaust system parts. can be further suppressed.

The high voltage component includes at least one of an inverter and a DC/DC converter, and the exhaust system component is a catalyst device.

According to this configuration, in a vehicle in which the first and second battery units are arranged on both sides of the propeller shaft in the vehicle width direction below the floor panel, the high voltage component including at least one of the inverter and the DC/DC converter and the catalyst device. Exhaust system components can be compactly arranged, and heat damage to high-voltage components caused by the exhaust system components can be suppressed.

According to the vehicle lower structure according to the present invention, in a vehicle in which the first and second battery units are arranged on both sides of the propeller shaft in the vehicle width direction below the floor panel, the high-voltage components and the exhaust system are arranged below the floor panel. The components can be compactly arranged, and heat damage to the high-voltage components due to the exhaust system components can be suppressed.

1 is a schematic diagram of a vehicle body to which a vehicle lower structure according to an embodiment of the invention is applied; FIG. 1 is a top view of a vehicle body to which a vehicle lower structure according to an embodiment of the invention is applied; FIG. 1 is a bottom view of a vehicle body to which a vehicle lower structure according to an embodiment of the invention is applied; FIG. FIG. 3 is a cross-sectional view of the vehicle body taken along line Y4-Y4 in FIG. 2; FIG. 3 is a cross-sectional view of the vehicle body taken along line Y5-Y5 of FIG. 2; FIG. 3 is a cross-sectional view of the vehicle body taken along line Y6-Y6 in FIG. 2; FIG. 3 is a cross-sectional view of the vehicle body taken along line Y7-Y7 in FIG. 2; It is a perspective view of a battery pack. FIG. 9 is a cross-sectional view of the battery pack taken along line Y9-Y9 in FIG. 8;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a vehicle body to which a vehicle lower structure according to an embodiment of the present invention is applied. A vehicle according to an embodiment of the present invention has an engine and a drive motor arranged on the front side of the vehicle as drive sources, and power from at least one of the engine and the drive motor is supplied to the rear wheels as drive wheels arranged on the rear side of the vehicle. It is a front-engine, rear-drive hybrid vehicle that transmits power to the wheels.

As shown in FIG. 1, a vehicle body 1 of the hybrid vehicle includes an engine 3 as a drive source 2, an automatic transmission 4 as a transmission connected to the engine 3, and a A motor (driving motor) 5 as a driving source 2 arranged in a motor (driving motor) 5, a propeller shaft 7 connected to an automatic transmission 4 to transmit power from the driving source 2 to rear wheels 6, and a propeller shaft 7 connected to and a differential gear 8 that transmits power from the drive source 2 to the left and right rear wheels 6 .

The propeller shaft 7 extends in the vehicle front-rear direction below a floor panel 10 that forms the floor surface of the vehicle compartment. A tunnel portion 11 is provided on the center side of the floor panel 10 in the vehicle width direction. The propeller shaft 7 is arranged inside the tunnel portion 11 . A front end portion of the propeller shaft 7 is connected to the automatic transmission 4 via a universal joint 15 , and a rear end portion of the propeller shaft 7 is connected to the differential gear 8 via a universal joint 16 .

In the vehicle body 1 , when an impact load acts on the drive source 2 from the front of the vehicle body at the time of a head-on collision, the impact load is input to the differential device 8 through the propeller shaft 7 . When an impact load is applied to the differential gear 8, the support of the differential gear 8 to the vehicle body 1 is released, and the vehicle front side of the differential gear 8 rotates downward with the axle 9 as a fulcrum. When the vehicle front side of the differential gear 8 is rotated downward, the vehicle rear side of the propeller shaft 7 is moved downward and deformed, and the drive source 2 is moved rearward of the vehicle body to enhance shock absorption. there is

The vehicle body 1 includes an exhaust pipe 17 extending from the engine 3 in the vehicle front-rear direction. The exhaust pipe 17 is arranged below the propeller shaft 7 below the tunnel portion 11 . A catalyst device 18 having a catalyst for purifying the exhaust gas from the engine 3 is disposed upstream of the exhaust pipe 17 as an exhaust system component, and a catalyst device 18 having a catalyst for purifying the exhaust gas from the engine 3 is disposed downstream of the exhaust pipe 17 as an exhaust system component that converts the exhaust gas from the engine 3 into the atmosphere. A silencer 19 is provided to reduce the emitted sound.

The vehicle body 1 includes a fuel tank 20 that stores fuel to be supplied to the engine 3 and a battery 30 that stores electric power to be supplied to the motor 5 . The motor 5 transmits power to the rear wheels 6 and is rotationally driven by the propeller shaft 7 when the vehicle decelerates to generate regenerative power and supply the generated power to the battery 30 .

The battery 30 is formed as an integrated battery pack 33 including a first battery unit 31 and a second battery unit 32 spaced apart on both sides of the propeller shaft 7 in the vehicle width direction. Each of the first and second battery units 31 and 32 is formed by connecting a plurality of battery modules that store electric power to be supplied to the motor 5 into a unit. A battery module is composed of a plurality of battery cells, and the battery cells are, for example, lithium-ion batteries.

The fuel tank 20 and the first and second battery units 31, 32 are arranged below the floor panel 10, and the fuel tank 20 is arranged behind the first and second battery units 31, 32 in the vehicle. It is arranged so as to be higher than the two battery units 31 and 32 .

Battery-related electrical components related to the battery 30 are arranged near the first and second battery units 31 and 32 . As battery-related electric parts, high-voltage parts such as an inverter 41, a DC/DC converter 42, and a junction box 43 electrically connected to the first and second battery units 31 and 32 are arranged. A high-voltage component and a high-voltage harness, which will be described later, refer to components to which a voltage exceeding 30V AC and 60V DC is applied.

The inverter 41 converts the DC power stored in the battery 30 into AC power and supplies it to the motor 5 , and also converts the AC power generated by the motor 5 into DC power when the vehicle decelerates to charge the battery 30 . The DC/DC converter 42 converts high-voltage DC power, such as 300 volts, stored in the battery 30 into low-voltage DC power, such as 12 volts, and supplies the power to auxiliary equipment and the like.

The junction boxes 43 include a front junction box 43a arranged on the vehicle front side of the first and second battery units 31, 32, and a rear junction box arranged on the vehicle rear side of the first and second battery units 31, 32. 43b.

The front and rear junction boxes 43a and 43b are so-called junction boxes for protecting terminals and terminals used when connecting, branching, and relaying harnesses, and have high-voltage relays, fuses, and the like. . The front and rear junction boxes 43a, 43b are electrically connected to the first and second battery units 31,32.

The first and second battery units 31 and 32 are electrically connected by a battery harness, which is a high voltage harness. The first and second battery units 31, 32 and the battery-related electrical components 41, 42, 43 are also electrically connected by battery harnesses, which are high-voltage harnesses. The first and second battery units 31 and 32 also use battery-related electric parts such as the junction box 43 .

A battery control unit 44 that controls the first and second battery units 31 and 32 is arranged near the first and second battery units 31 and 32 . The battery control unit 44 is electrically connected to the first and second battery units 31, 32, the battery-related electrical components 41, 42, 43, etc. by harnesses.

Next, a vehicle lower structure according to an embodiment of the present invention will be specifically described with reference to FIGS. 2 to 9. FIG.

FIG. 2 is a top view of a vehicle body to which the vehicle lower structure according to the embodiment of the invention is applied, and FIG. 3 is a bottom view of the vehicle body to which the vehicle lower structure according to the embodiment of the invention is applied. 4 is a cross-sectional view of the vehicle body along line Y4-Y4 in FIG. 2, FIG. 5 is a cross-sectional view of the vehicle body along line Y5-Y5 in FIG. 2, and FIG. 6 is a cross-sectional view along line Y6-Y6 in FIG. FIG. 7 is a cross-sectional view of the vehicle body taken along line Y7-Y7 in FIG.

As shown in FIG. 2, the vehicle body 1 includes a floor panel 10, left and right side sills 21 connected to both ends of the floor panel 10 in the vehicle width direction and extending linearly in the vehicle front-rear direction, and a floor panel. 10, a first cross member 22 and a second cross member 23 are provided between the left and right side sills 21 and extend in the vehicle width direction.

The floor panel 10 is formed with a tunnel portion 11 that extends in the vehicle front-rear direction and bulges upward at the center in the vehicle width direction. As shown in FIG. 6, the tunnel portion 11 has an upper surface portion 11a and side surface portions 11b on both sides, and is open downward. As shown in FIG. 5, the front end of floor panel 10 is connected to dash panel 24 . The dash panel 24 divides the vehicle front side of the vehicle interior 25 and extends in the vertical direction of the vehicle body.

The floor panel 10 has a kick-up portion 12 formed higher than the front portion of the floor panel 10 at the rear portion of the floor panel 10 . The kick-up portion 12 is provided below the rear seat 26 . The kick-up portion 12 extends upward from the front portion of the floor panel 10 and then extends substantially horizontally rearward of the vehicle.

A rear floor panel 27 formed higher than the rear end portion of the kick-up portion 12 is joined to the rear end portion of the floor panel 10 , specifically to the rear end portion of the kick-up portion 12 . The rear floor panel 27 extends upward from the rear end of the kick-up portion 12 and then extends substantially horizontally rearward of the vehicle.

A third cross member 28 is attached to the lower surface of the rear floor panel 27 so as to span between the front ends of the left and right rear frames 14 and extend in the vehicle width direction. The third cross member 28 has a substantially hat-shaped cross section and is joined to the rear floor panel 27 .

As shown in FIG. 6, each of the left and right side sills 21 is formed to have a closed cross-section by joining a side sill inner 21a forming the inner side of the side sill 21 with a side sill outer 21b forming the outer side of the side sill 21. .

The first and second cross members 22 and 23 are spaced apart in the vehicle front-rear direction, and the first cross member 22 is located on the front side of the vehicle relative to the second cross member 23 . The first and second cross members 22 and 23 are each formed to have a substantially hat-shaped cross section and are joined to the floor panel 10 .

The first and second cross members 22 and 23 are separated in the vehicle width direction by the tunnel portion 11 , and the separated first and second cross members 22 and 23 have their outer ends in the vehicle width direction attached to the side sill 21 . The inner end portion in the vehicle width direction is joined to the tunnel portion 11 .

As shown in FIG. 3 , left and right floor frames 50 are arranged on the lower surface of the floor panel 10 so as to extend in the vehicle front-rear direction while being spaced apart in the vehicle width direction. The left and right floor frames 50 are arranged inside the left and right side sills 21 in the vehicle width direction, respectively, and are arranged between the side sills 21 and the tunnel portion 11 in the vehicle width direction.

As shown in FIG. 7, the floor frame 50 is formed with a substantially hat-shaped cross section including a lower surface portion 50a, side surface portions 50b on both sides, and flange portions 50c on both sides. The floor frame 50 is joined to the floor panel 10 at the flange portions 50c on both sides, and cooperates with the floor panel 10 to form a closed cross-sectional shape.

The front ends of the left and right floor frames 50 are respectively connected to the left and right front frames 13 that are spaced apart in the vehicle width direction on the front side of the vehicle and extend substantially linearly in the vehicle front-rear direction. The left and right front frames 13 are each formed to have a closed cross section and extend from the dash panel 24 toward the vehicle front side.

The rear ends of the left and right floor frames 50 are respectively connected to the left and right rear frames 14 that are spaced apart in the vehicle width direction on the rear side of the vehicle and extend substantially linearly in the vehicle front-rear direction. The left and right rear frames 14 are formed to have a substantially hat-shaped cross section, are attached to the lower surface side of the rear floor panel 27 , and are formed to have a closed cross section together with the rear floor panel 27 .

Each of the left and right floor frames 50 has a front inclined portion 51 that inclines outward in the vehicle width direction from the front side of the vehicle toward the rear side of the vehicle, and a front inclined portion 51 that extends linearly toward the rear side of the vehicle from the front inclined portion 51 and widens outward in the vehicle width direction. and a rear inclined portion 53 inclined inward in the vehicle width direction from the widened portion 52 toward the rear side of the vehicle. The left and right floor frames 50 are widened outward in the vehicle width direction at the vehicle front-rear direction center side compared to the vehicle front side and vehicle rear side, and the left and right widened portions 52 are wider than the front inclined portions 51 and the rear inclined portions 53 . It is formed large in the width direction.

As shown in FIG. 6 , left and right tunnel reinforcing members 54 are joined to the bottom surface of the floor panel 10 so as to be spaced apart in the vehicle width direction on both sides of the tunnel portion 11 and extend in the vehicle front-rear direction. ing. The tunnel reinforcing member 54 is joined to the lower surface side of the floor panel 10 and cooperates with the floor panel 10 to form a closed cross-sectional shape.

Left and right floor reinforcing members 56 are joined to the upper surface of the floor panel 10 so as to extend in the vehicle front-rear direction along the front inclined portion 51 of the floor frame 50, as shown in FIG. The floor reinforcing member 56 cooperates with the floor panel 10 to form a closed cross-sectional shape. A front end portion of the floor reinforcing member 56 is joined to the dash panel 24 and a rear end portion of the floor reinforcing member 56 is joined to the first cross member 22 . Vehicle body constituent members such as the floor panel 10, the floor frame 50, and the tunnel reinforcing member 54 are formed by, for example, press-molding a steel plate.

Below the floor panel 10, the automatic transmission 4 and the propeller shaft 7 are arranged on the center side in the vehicle width direction. As shown in FIG. 4 , the automatic transmission 4 and the propeller shaft 7 are arranged inside the tunnel portion 11 and supported by the vehicle body 1 . As shown in FIG. 3 , the automatic transmission 4 is arranged between the front inclined portions 51 of the left and right floor frames 50 , and the propeller shaft 7 is arranged between the widened portions 52 and between the rear inclined portions 53 of the left and right floor frames 50 . are placed.

A fuel tank 20 is arranged below the floor panel 10 between the rear inclined portions 53 of the left and right floor frames 50 . The fuel tank 20 is arranged below the kick-up portion 12 of the floor panel 10 so as to be higher than the front portion of the floor panel 10 .

As shown in FIG. 5, the upper surface portion 20a of the fuel tank 20 is arranged above the front portion of the floor panel 10, and the lower surface portion 20b of the fuel tank 20 is arranged below the front portion of the floor panel 10. there is The fuel tank 20 is formed so as to extend along both sides in the vehicle width direction and in the vehicle front-rear direction, and has a hollow space in which fuel is stored.

As shown in FIG. 4, the fuel tank 20 has a concave portion 20c which is recessed upward in a substantially semicircular cross section so as to avoid interference with the propeller shaft 7, on the center side in the vehicle width direction of the lower surface portion 20b. there is As shown in FIG. 3 , the fuel tank 20 is fixed to the vehicle body 1 by being supported from below by left and right fixing belts 57 that fix the fuel tank 20 . A front end portion of the fixed belt 57 is fixed to the tank mounting member 58 attached to the widened portion 52 of the floor frame 50 using a fastening bolt, and a rear end portion of the fixed belt 57 is fixed to the third cross member 28 in the vehicle width direction. It is fixed to a tank mounting member 59 mounted on the central side using a fastening bolt.

An exhaust pipe 17 extending from the engine 3 and a catalytic device 18 are arranged below the floor panel 10 . The exhaust pipe 17 and the catalyst device 18 are supported by the floor panel 10 . The catalyst device 18 is arranged between the front inclined portions 51 of the left and right floor frames 50 and is arranged between the automatic transmission 4 and the front inclined portion 51 of the floor frame 50 on the vehicle right side, which is one side in the vehicle width direction. ing.

The exhaust pipe 17 arranged below the floor panel 10 extends toward the front of the vehicle along the front inclined portion 51 of the floor frame 50 on the upstream side of the catalyst device 18 and is connected to the engine 3. The downstream side of the catalyst device 18 extends across the width of the vehicle. After extending inward in the direction, it extends substantially linearly toward the rear side of the vehicle and is connected to the silencer 19 .

The exhaust pipe 17 extends in the vehicle front-rear direction below the propeller shaft 7 below the tunnel portion 11 of the floor panel 10 . As shown in FIG. 6, below the tunnel portion 11 of the floor panel 10, the exhaust pipe 17 is arranged at a position where the central axis 7a of the propeller shaft 7 and the central axis 17a of the exhaust pipe 17 are aligned in the vehicle width direction. It is

Below the floor panel 10, first and second battery units 31 and 32 are arranged spaced apart on both sides of the propeller shaft 7 in the vehicle width direction. Each of the first and second battery units 31 and 32 is formed as a high-voltage battery unitized by connecting a plurality of battery modules.

The first and second battery units 31 and 32 are arranged between the widened portions 52 of the left and right floor frames 50 on the vehicle front side of the kick-up portion 12 of the floor panel 10 . The first battery unit 31 is arranged between the widened portion 52 of the floor frame 50 on the vehicle left side and the propeller shaft 7 in the vehicle width direction, and the second battery unit 32 is arranged on the floor frame 50 on the vehicle right side in the vehicle width direction. It is arranged between the widened portion 52 and the propeller shaft 7 . The first and second battery units 31 and 32 are integrally formed as a battery pack 33 and supported by the vehicle body 1 .

8 is a perspective view of the battery pack, and FIG. 9 is a sectional view of the battery pack along line Y9-Y9 in FIG. As shown in FIGS. 8 and 9 , the battery pack 33 includes first and second battery units 31 and 32 spaced apart on both sides of the propeller shaft 7 in the vehicle width direction, and the first and second battery unit 31 . , 32.

Each of the first and second battery units 31 and 32 is formed in a substantially rectangular parallelepiped shape in plan view. The first and second battery units 31 and 32 are formed substantially symmetrically on both sides of the propeller shaft 7 in the vehicle width direction, although not limited to this. As described above, the first and second battery units 31 and 32 are arranged between the widened portions 52 of the floor frame 50, and the width in the vehicle width direction is reduced compared to the case where the floor frame is not widened outward in the vehicle width direction. By increasing the size, the battery capacity is formed to be large.

The battery cover 60 includes a first battery housing portion 61 that houses the first battery unit 31, a second battery housing portion 66 that houses the second battery unit 32, and a first battery housing portion 61 and a second battery housing portion 66. and a connecting portion 71 extending in the vehicle width direction. The battery cover 60 is formed using an aluminum material, for example.

The first battery housing portion 61 is formed in a substantially rectangular parallelepiped shape. It is composed of a member 63 .

The first upper cover member 62 has a substantially rectangular upper surface portion 62a extending substantially horizontally, a side surface portion 62b extending downward from the periphery of the upper surface portion 62a, and outwardly extending from the lower end portion of the side surface portion 62b. A flange portion 62c extending substantially horizontally is provided, and the upper surface portion 62a is formed so as to bulge upward.

The first lower cover member 63 has a substantially rectangular lower surface portion 63a extending substantially horizontally, a side surface portion 63b extending upward from the peripheral edge of the lower surface portion 63a, and outwardly extending from the upper end portion of the side surface portion 63b. and a flange portion 63c extending substantially horizontally, and the lower surface portion 63a is formed so as to bulge downward.

The first battery housing portion 61 is formed by joining the first upper cover member 62 and the first lower cover member 63 by joining the flange portion 62c and the flange portion 63c. The first battery unit 31 is attached to the lower surface portion 63 a of the first lower cover member 63 and housed inside the first upper cover member 62 and the first lower cover member 63 .

The first battery housing portion 61 is formed with a front extending portion 64 that extends in a substantially rectangular parallelepiped shape from the outside of the first battery housing portion 61 in the vehicle width direction toward the vehicle front side. The first upper cover member 62 and the first lower cover member 63 each extend from the vehicle width direction outer side on the vehicle front side to the vehicle front side so as to form a front extending portion 64 .

The front junction box 43a is formed in a substantially rectangular parallelepiped shape and in a flat shape. The front junction box 43a is arranged horizontally so that the height in the vertical direction is smaller than the length in the longitudinal direction of the vehicle. The front junction box 43a is attached to the lower surface portion 63a of the first lower cover member 63 that constitutes the front extending portion 64 on the vehicle front side of the first battery unit 31, and the first upper cover member 62 and the first lower cover member 62 are attached to the lower surface portion 63a. It is housed inside the member 63 .

As shown in FIG. 3 , in the first battery housing portion 61 , a first opening 62 d is formed in the upper surface portion 62 a of the first upper cover member 62 on the vehicle rear side of the first battery unit 31 . The first opening 62d is formed in a substantially rectangular shape, and is formed in an elongated hole shape that is longer in the vehicle width direction than in the vehicle front-rear direction. The rear junction box 43b, the battery harness, and the like are inserted through the first opening 62d.

The second battery housing portion 66 is formed in a substantially rectangular parallelepiped shape. member 68.

The second upper cover member 67 has a substantially rectangular top surface portion 67a extending substantially horizontally, a side surface portion 67b extending downward from the periphery of the top surface portion 67a, and outwardly extending from the lower end portion of the side surface portion 67b. A flange portion 67c extending in a substantially horizontal direction is provided, and the upper surface portion 67a is formed so as to bulge upward.

The second lower cover member 68 includes a substantially rectangular lower surface portion 68a extending substantially horizontally, a side surface portion 68b extending upward from the periphery of the lower surface portion 68a, and outwardly extending from the upper end portion of the side surface portion 68b. and a flange portion 68c extending substantially horizontally, and the lower surface portion 68a is formed so as to bulge downward.

The second battery housing portion 66 is formed by joining the second upper cover member 67 and the second lower cover member 68 by joining the flange portion 67c and the flange portion 68c. The second battery unit 32 is attached to the lower surface portion 68 a of the second lower cover member 68 and housed inside the second upper cover member 67 and the second lower cover member 68 .

As shown in FIG. 3 , in the second battery housing portion 66 , a second opening 67 d is formed in the upper surface portion 67 a of the second upper cover member 67 on the vehicle rear side of the second battery unit 32 . The second opening 67d is formed in a substantially rectangular shape, and is formed in an elongated hole shape that is longer in the vehicle width direction than in the vehicle front-rear direction. The battery control unit 44, the battery harness, and the like are inserted through the second opening 67d.

The connecting portion 71 is formed in a substantially rectangular parallelepiped shape that extends longer in the vehicle width direction than in the vehicle front-rear direction and the vehicle up-down direction. The connecting portion 71 connects the vehicle rear side of the first battery housing portion 61 and the second battery housing portion 66 . The connecting portion 71 is formed to have a smaller length in the vehicle front-rear direction than the first and second battery housing portions 61 and 66 .

The connecting portion 71 is higher than the first and second battery housing portions 61 and 66, connects the first and second battery housing portions 61 and 66, extends in the vehicle width direction, and is arranged adjacent to the fuel tank 20 on the front side of the vehicle. be done. As shown in FIG. 9 , the connecting portion 71 is composed of a front cover member 72 forming the vehicle front side of the connecting portion 71 and a rear cover member 73 forming the vehicle rear side of the connecting portion 71 .

The front cover member 72 includes a lower surface portion 72a attached to the upper surface portions 62a and 67a of the first and second battery housing portions 61 and 66, and a peripheral wall portion 72b extending upward from the lower surface portion 72a. As shown in FIG. 3, the lower surface portion 72a of the front cover member 72 has, on both sides thereof in the vehicle width direction, corresponding to the first opening portion 62d of the first battery housing portion 61 and the second opening portion 67d of the second battery housing portion 66. Then, a first opening 72c and a second opening 72d are formed.

The first and second openings 72c, 72d of the front cover member 72 are formed to have substantially the same shape as the first and second openings 62d, 67d of the first and second battery storage portions 61, 66, respectively. The first and second openings 72c, 72d of the front cover member 72 are formed in a substantially rectangular shape, and are formed in an elongated hole shape that is longer in the vehicle width direction than in the vehicle front-rear direction. The rear junction box 43b, the battery harness, and the like are inserted through the first opening 72c, and the battery control unit 44, the battery harness, and the like are inserted through the second opening 72d.

The peripheral wall portion 72b of the front cover member 72 extends upward from the lower surface portion 72a and constitutes the vehicle front side and both sides of the connecting portion 71 in the vehicle width direction. A mating surface 72e with the rear cover member 73 is formed on the vehicle rear side of the peripheral wall portion 72b. A mating surface 72e of the front cover member 72 is formed to be inclined downward toward the vehicle rear side over the entire vehicle width direction.

The rear cover member 73 includes an upper surface portion 73a and a peripheral wall portion 73b extending downward from the upper surface portion 73a. The peripheral wall portion 73b of the rear cover member 73 extends downward from the upper surface portion 73a and constitutes the vehicle rear side and both sides of the connecting portion 71 in the vehicle width direction. A mating surface 73c with the front cover member 72 is formed on the vehicle front side of the peripheral wall portion 73b. The mating surface 73c of the rear cover member 73 is formed so as to incline downward toward the vehicle rear side over the entire width direction of the vehicle.

The front cover member 72 is fastened with a plurality of fastening bolts B extending vertically such that the lower surface portion 72a of the front cover member 72 overlaps the upper surface portions 62a and 67a of the first and second battery housing portions 61 and 66, respectively. It is connected to the first and second battery housings 61 and 66 . The rear cover member 73 is secured to the front cover member 73 by using a plurality of fastening bolts B extending obliquely toward the vehicle front side and vehicle lower side such that the mating surface 73c of the rear cover member 73 is mated with the mating surface 72e of the front cover member 72. 72.

The connecting portion 71 has a hollow space formed therein by connecting the front side cover member 72 and the rear side cover member 73 . The connecting portion 71 has a concave portion 76a recessed upward on the lower side of the central portion 76 in the vehicle width direction. The recessed portion 76 a of the connecting portion 71 is formed between the first battery housing portion 61 and the second battery housing portion 66 in the vehicle width direction so as to correspond to the tunnel portion 11 of the floor panel 10 .

A central portion 76 in the vehicle width direction of the connecting portion 71 is formed to be shorter in the vertical direction than the outer portions 77 in the vehicle width direction on both sides due to the concave portion 76a. A center portion 76 in the vehicle width direction of the connecting portion 71 functions as a fragile portion 76 that is vulnerable to the impact load acting from the outside in the vehicle width direction when an impact load acts on the battery pack 33 from the outside in the vehicle width direction.

The rear junction box 43b is arranged in the vehicle width direction outside portion 77 of the connecting portion 71 on the left side of the vehicle. The rear junction box 43b is formed in a flat shape and arranged vertically so that the length in the longitudinal direction of the vehicle is smaller than the height in the vertical direction.

As shown in FIG. 9, the rear junction box 43b is mounted on a base 63d provided inside the first battery housing portion 61, and is positioned between the first opening 62d of the first battery housing portion 61 and the connecting portion 71. It is accommodated in the connecting portion 71 and the first battery accommodating portion 61 through the first opening 72c. The rear junction box 43b is arranged adjacent to the vehicle front side of the fuel tank 20 so as to be higher than the first and second battery units 31,32.

The battery control unit 44 is arranged in the vehicle width direction outside portion 77 on the right side of the vehicle of the connecting portion 71 . The battery control unit 44 is formed in a flat shape and arranged vertically so that the length in the longitudinal direction of the vehicle is smaller than the height in the vertical direction.

Like the rear junction box 43b, the battery control unit 44 is mounted on a base provided in the second battery housing portion 66 so that the second opening 67d of the second battery housing portion 66 and the connecting portion 71 are connected. It is accommodated in the connecting portion 71 and the second battery accommodating portion 66 through the second opening 72d. The battery control unit 44 is arranged adjacent to the vehicle front side of the fuel tank 20 so as to be higher than the first and second battery units 31 and 32 .

As shown in FIG. 8, in the connecting portion 71, a battery harness 78 electrically connecting the first and second battery units 31 and 32, a rear junction box 43b and the battery control unit 44 are electrically connected. A battery harness such as a battery harness 79 extending in the vehicle width direction extends through the vehicle width direction central portion 76 .

In the battery pack 33, as shown in FIG. 6, a plurality of mounting portions 61a and 66a on the vehicle width direction outside of the first and second battery storage portions 61 and 66 are fixed to the floor frame 50 using a plurality of fastening bolts B. A plurality of mounting portions 61b, 66b on the inner side of the vehicle width direction of the first and second battery housing portions 61, 66 are fixed to the tunnel reinforcing member 54 using a plurality of fastening bolts B, and the fuel tank is installed below the floor panel 10. It is attached adjacent to the vehicle front side of the tank 20 .

When the battery pack 33 is attached below the floor panel 10 , the first and second battery units 31 and 32 are spaced apart on both sides of the propeller shaft 7 in the vehicle width direction, and the connecting portion 71 is connected to the floor panel 10 . A battery harness 78 that is arranged below the kick-up portion 12 and above the propeller shaft 7 and electrically connects the first and second battery units 31 and 32 is arranged to pass above the propeller shaft 7 . .

The connecting portion 71 of the battery pack 33 is also arranged to be higher than the first and second battery housing portions 61, 66 so that fuel is supplied below the kick-up portion 12 of the floor panel 10 arranged below the rear seat 26. It is arranged on the vehicle front side of the tank 20 .

The rear junction box 43b and the battery control unit 44 are arranged below the kick-up portion 12 of the floor panel 10, and are spaced apart on both sides of the propeller shaft 7 in the vehicle width direction. The battery control unit 44 is arranged at a position overlapping at least a portion of the rear junction box 43b in the vehicle front-rear direction when viewed from the side of the vehicle.

As shown in FIG. 5 , an inverter 41 and a DC/DC converter 42 are arranged as battery-related electrical components in the vicinity of the battery pack 33 , specifically the first battery housing portion 61 , on the front side of the vehicle. Each of the inverter 41 and the DC/DC converter 42 is formed in a flat shape, and is arranged horizontally with a height in the vertical direction smaller than the length in the longitudinal direction of the vehicle. Each of the inverter 41 and the DC/DC converter 42 is formed in a substantially rectangular shape in plan view, as shown in FIG.

The inverter 41 and the DC/DC converter 42 are each formed to have a smaller width in the vehicle width direction than the first and second battery units 31 and 32 . The DC/DC converter 42 has a smaller width in the vehicle width direction and a larger length in the vehicle front-rear direction than the inverter 41 .

The inverter 41 and the DC/DC converter 42 are arranged between the front inclined portions 51 of the left and right floor frames 50 and between the transmission 4 and the front inclined portion 51 of the floor frame 50 on the left side of the vehicle. The inverter 41 and the DC/DC converter 42 are arranged such that the vehicle width direction inner side thereof substantially coincides with the vehicle width direction.

The DC/DC converter 42 is arranged on the front side of the vehicle relative to the inverter 41 and is arranged to be vertically stacked on the upper side of the inverter 41 . As shown in FIGS. 5 and 7, the inverter 41 and the DC/DC converter 42 are directly or indirectly connected to the floor using a plurality of fastening bolts B while housed in the inverter case 41a and the converter case 42a. Attached to panel 10 .

The inverter 41 and the DC/DC converter 42 are arranged between the transmission 4 and the floor frame 50 on the left side of the vehicle, and the catalyst device 18 is arranged between the transmission 4 and the floor frame 50 on the right side of the vehicle. . The inverter 41 and the DC/DC converter 42 and the catalyst device 18 are spaced apart on one side and the other side in the vehicle width direction. It is arranged in a position where it partially overlaps in the longitudinal direction of the vehicle. Either the inverter 41 or the DC/DC converter 42 may be arranged at a position overlapping at least part of the catalyst device 18 in the vehicle front-rear direction.

The inverter 41 and the DC/DC converter 42 are electrically connected to the first battery unit 31 and the front junction box 43a by a battery harness 80, which is a high voltage harness. A battery harness 80 electrically connecting the inverter 41 and the DC/DC converter 42 to the first battery unit 31 and the front junction box 43a is located on the front side of the front extension portion 64 of the first battery housing portion 61 on the inside in the vehicle width direction. It extends in the vehicle front-rear direction along the extended portion 64 .

Although not shown, the vehicle body 1 is also provided with battery-related electric parts such as a heater unit for heating the vehicle interior 25 between the transmission 4 and the front inclined portion 51 of the floor frame 50 on the left side of the vehicle. It is The heater unit is formed in a flat shape and is composed of a sheet-like electric heating wire heater, for example, a PTC (Positive Temperature Coefficient) heater.

In the vehicle body 1 constructed in this manner, when an impact load acts from the front of the vehicle body at the time of a head-on collision, when the impact load acts on the drive source 2 from the front of the vehicle body, the front side of the vehicle of the differential device 8 rotates downward. At the same time, the vehicle rear side of the propeller shaft 7 is moved downward and deformed, and the drive source 2 is moved rearward of the vehicle body.

Since the first and second battery units 31 and 32 are arranged on both sides of the propeller shaft 7 in the vehicle width direction below the floor panel 10, when the vehicle rear side of the propeller shaft 7 moves downward and is deformed, Also, the contact of the propeller shaft 7 with the first and second battery units 31 and 32 can be suppressed. The battery harness 78 that electrically connects the first and second battery units 31 and 32 is also arranged to pass above the propeller shaft 7 , so that the propeller shaft 7 is prevented from coming into contact with the battery harness 78 . be able to.

In the vehicle body 1, when an impact load acts from the outside in the vehicle width direction at the time of a side collision, if the impact load acts on the battery pack 33 from the outside in the vehicle width direction, the connecting portion 71 of the battery pack 33 is provided with the weakened portion 76. Therefore, crushing deformation of the fragile portion 76 and crushing deformation of the first and second battery accommodating portions 61 and 66 can be suppressed.

Thus, the vehicle lower structure according to the present embodiment includes the first and second battery units 31 and 32 arranged on both sides of the propeller shaft 7 in the vehicle width direction below the floor panel 10, and the first and second battery units 31 and 32. High voltage components 41 and 42 connected to the battery units 31 and 32 and an exhaust system component 18 of the engine 3 are provided. The high-voltage components 41 and 42 and the exhaust system component 18 are arranged on the front side of the vehicle from the first and second battery units 31 and 32 below the floor panel 10 and spaced apart on one side and the other side in the vehicle width direction.

As a result, in a vehicle in which the first and second battery units 31 and 32 are arranged on both sides of the propeller shaft 7 in the vehicle width direction below the floor panel 10, the high voltage components 41 and 42 and the exhaust system component 18 are Also, since the second battery units 31 and 32 are arranged on the front side of the vehicle and separated from each other in the vehicle width direction, they can be arranged more compactly in the vehicle front-rear direction than in the case where they are arranged in the vehicle front-rear direction. Since the high-voltage components 41, 42 and the exhaust system component 18 are spaced apart on both sides in the vehicle width direction, it is possible to suppress the heat transfer of the exhaust system component 18 to the high-voltage components 41, 42 under various engine conditions. , and heat damage to the high-voltage components 41 and 42 by the exhaust system component 18 can be suppressed.

Therefore, in a vehicle in which the first and second battery units 31 and 32 are arranged on both sides of the propeller shaft 7 in the vehicle width direction below the floor panel 10, the high voltage components 41 and 42 and the exhaust system components are arranged below the floor panel 10. 18 can be compactly arranged, and heat damage to the high-voltage components 41 and 42 by the exhaust system component 18 can be suppressed.

In addition, the high-voltage components 41 and 42 are arranged at positions overlapping at least a portion of the exhaust system component 18 in the vehicle front-rear direction when viewed from the side of the vehicle. As a result, the high-voltage components 41 and 42 and the exhaust system component 18 can be configured compactly in the longitudinal direction of the vehicle. Compared to the case where the high-voltage components 41 and 42 are not arranged to overlap at least a part of the exhaust system component 18 in the longitudinal direction of the vehicle, the high-voltage components 41 and 42 and the exhaust system components 18 can be arranged in a limited space below the floor panel 10. It is possible to increase the battery capacity by arranging the system parts 18 compactly and enlarging the first and second battery units 31 and 32 in the longitudinal direction of the vehicle.

Further, an exhaust pipe 17 extending from the engine 3 and having an exhaust system component 18 disposed thereon is provided. Accordingly, since the exhaust pipe 17 is arranged below the propeller shaft 7, the first and second battery units 31 and 32 are formed so as to avoid the exhaust pipe 17. decrease in battery capacity can be suppressed.

In addition, the high-voltage components 41 and 42 and the exhaust system component 18 are arranged separately on both sides of the transmission 4 in the vehicle width direction. As a result, the transmission 4 disposed between the high-voltage components 41 and 42 and the exhaust system component 18 can suppress the transmission of the heat of the exhaust system component 18 to the high-voltage components 41 and 42. Heat damage to the high-voltage components 41 and 42 by the component 18 can be further suppressed.

High voltage components 41 and 42 include at least one of inverter 41 and DC/DC converter 42 , and exhaust system component 18 is catalytic device 18 . As a result, in a vehicle in which the first and second battery units 31 and 32 are arranged on both sides of the propeller shaft 7 in the vehicle width direction below the floor panel 10, a high voltage battery including at least one of the inverter 41 and the DC/DC converter 42 can be obtained. The components 41, 42 and the exhaust system component 18, which is the catalytic device 18, can be compactly arranged, and heat damage to the high voltage components 41, 42 caused by the exhaust system component 18 can be suppressed.

In this embodiment, the drive motor 5 is arranged between the engine 3 and the transmission 4, but the drive motor is arranged separately from the engine 3 and the transmission 4, and the power from at least one of the engine 3 and the drive motor 5 is arranged. You may make it transmit power to the drive wheel 6. FIG.

The vehicle according to the present embodiment is a hybrid vehicle in which the engine 3 is arranged on the front side of the vehicle and the power from the engine 3 is transmitted to the drive wheels 6 arranged on the rear side of the vehicle. The same can be applied to four-wheel drive hybrid vehicles of the type.

The present invention is not limited to the illustrated embodiments, and various improvements and design changes are possible without departing from the gist of the invention.

As described above, according to the present invention, in a vehicle in which the first and second battery units are arranged on both sides of the propeller shaft in the vehicle width direction below the floor panel, the high-voltage parts and the exhaust system parts are arranged compactly. At the same time, it is possible to suppress heat damage to high-voltage parts due to exhaust system parts, so there is a possibility that it will be suitably used in this type of vehicle.

2 Drive Source 3 Engine 4 Transmission 5 Motor 7 Propeller Shaft 10 Floor Panel 17 Exhaust Pipe 18 Catalytic Device 31 First Battery Unit 32 Second Battery Unit 41 Inverter 42 DC/DC Converter

Claims (5)

A drive source having an engine and a drive motor, a floor panel forming the floor surface of the passenger compartment, and a propeller shaft extending in the longitudinal direction of the vehicle below the floor panel and transmitting power from the drive source to the drive wheels. A vehicle undercarriage comprising:
a first battery unit and a second battery unit that are spaced apart from each other on both sides of the propeller shaft in the vehicle width direction below the floor panel and that store electric power to be supplied to the drive motor;
a high voltage component connected to the first battery unit and the second battery unit;
and an exhaust system component of the engine,
The high-voltage component and the exhaust system component are spaced apart on one side and the other side in the vehicle width direction on the front side of the vehicle from the first battery unit and the second battery unit below the floor panel,
A vehicle undercarriage characterized by: The high-voltage component is arranged at a position overlapping at least a portion of the exhaust system component in the vehicle front-rear direction when viewed from the side of the vehicle.
The vehicle lower structure according to claim 1, characterized in that: An exhaust pipe extending from the engine and in which the exhaust system parts are arranged,
The exhaust pipe downstream of the exhaust system component is arranged below the propeller shaft,
3. A vehicle lower structure according to claim 1 or 2, characterized in that: A transmission connected to the engine is connected to the vehicle front side of the propeller shaft,
The high-voltage component and the exhaust system component are spaced apart on both sides of the transmission in the vehicle width direction,
The vehicle lower structure according to any one of claims 1 to 3, characterized in that: the high voltage component includes at least one of an inverter and a DC/DC converter;
The exhaust system component is a catalytic device,
The vehicle lower structure according to any one of claims 1 to 4, characterized in that:

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