Pickup truck with lower body for protecting drainage structure of power electronics system

Abstract

The lower vehicle body having the drainage structure for protecting the PE system applied to a pickup truck may include a PE boss of a rear floor panel forming a lower space of a lathe floor with the lathe floor, and the periphery of the PE system is formed as a drainage protection area by, for example, using a water blocking wall, thereby preventing water from being discharged to the top of the PE system, and preventing water leakage. In particular, the retention of water at corners due to the prevention of water discharge to the top of the PE system is prevented by the drainage protection area and the drainage guide area, and the flow of water into the room and retention in the rear floor panel due to the discharge of water to the lower end and side of the lathe floor is prevented by the drainage area.

Description

Field of the Invention

[0001] The present invention relates to a pickup truck with a drainage structure of a bed floor. background

[0002] Generally speaking, a pickup truck includes a cabin of a driver's seat, which is an interior space, and a deck of a cargo box, which is an outdoor space that can load and transport cargo, and has recently been expanded to electric vehicles, so that various electric vehicle (EV) pickup trucks are being commercialized.

[0003] For example, in an EV pickup truck, the power electronics (PE) system is located below the rear floor panel, with a bed floor added above it. In this case, the PE system is a rear (RR) PE system, and the bed floor is made of sheet molding compound (SMC) to ensure the truck's marketability.

[0004] Since the rear floor panel of the EV pickup truck exists at the same time as the bed floor, drainage holes are applied for drainage, and drainage holes are drilled at the front and rear positions of the rear floor panel to form an underbody drainage structure.

[0005] Therefore, the EV pickup truck can drain the water accumulated in the cargo space of the cargo hold to the ground through the drain holes in the rear floor panel.

[0006] However, the drainage hole location adopted in the underbody with drainage structure applied to EV pickup trucks does not take into account the position of the PE system located at the lower end of the rear floor panel. This indifferent drainage hole location causes the drainage path to be located at the top of the PE system, causing serious safety problems of the PE system due to drainage.

[0007] Furthermore, even if the drain hole is located away from the PE system, water may remain in the cargo hold or water may flow into the interior (ie, the cabin) when the drain hole is applied to an inappropriate adjacent shape. Summary of the Invention

[0008] The present invention relates to a pickup truck, and more particularly, to a pickup truck having an underbody having a drainage structure of a bed floor and a rear floor panel to prevent water from draining onto a top of a PE system.

[0009] Therefore, with this in mind, an embodiment of the present disclosure is intended to provide a pickup truck that applies an undercarriage having a drainage structure for protecting a PE system, wherein a drainage protection area of ​​the PE system is provided on a rear floor panel on which a bed floor is formed, thereby preventing water from draining to the top of the PE system, and in particular, water is prevented from stagnation at corners due to prevention of water from draining to the top of the PE system by the drainage protection area and the drainage guide area, and water is prevented from flowing into the room and stagnation in the rear floor panel by draining water to the lower end and sides of the bed floor by the drainage area.

[0010] To achieve this objective, one embodiment of the present invention may include an undercarriage having a drainage structure for protecting a power electronics (PE) system, the undercarriage including a rear floor panel, a bed floor attached to an upper end of the rear floor panel to form a space under the bed floor, and a PE raised portion that forms a periphery of the PE system located below the rear floor panel as a drainage protection zone using a water blocking wall, wherein the water blocking wall moves water from the PE raised portion to the drainage zone of the rear floor panel at a protruding height higher than the drainage zone.

[0011] In an embodiment of the present disclosure, the water blocking wall can be an edge forming the height of the PE protrusion, three of the four faces of the edge can be formed as protrusion edge inclined faces and point to the front of the PE system, and the remaining one face can be formed as a protrusion rear inclined face and point to the rear of the PE system.

[0012] In an embodiment of the present disclosure, the rear floor panel may have a drain hole formed in the drain area so that water is drained to the outside of the rear floor panel.

[0013] In an embodiment of the present disclosure, the rear floor panel may divide the drainage area into a front drainage area formed at the PE mounting portion and a rear drainage area formed at the rear portion with respect to the PE protrusion portion.

[0014] In an embodiment of the present disclosure, the rear floor panel may enable water to move by forming an extension surface having a downwardly inclined structure connected to the PE mounting portion on a connection portion connected to the PE mounting portion.

[0015] In an embodiment of the present disclosure, the rear floor panel can form a drainage guide area together with the extended surface and the rear and the surrounding parts of the PE protrusion, and apply the front inclined structure and the rear inclined structure to the drainage guide area so that water moves to the drainage guide area by tilting downward.

[0016] In an embodiment of the present disclosure, the front inclined structure can be formed as an extension surface of the connection part connected to the PE mounting part and an inclined surface of the edge of the raised part of the PE raised part, and the rear inclined structure can be formed as a rear inclined surface of the raised part of the PE raised part connected to the third drainage hole formed at the rear of the drainage hole.

[0017] In an embodiment of the present disclosure, the rear floor panel may be connected to a rear floor member surrounding a side portion of the rear floor panel below the rear floor panel, an upper member located above the rear floor panel, and a quarter panel connected to the side portion of the rear floor member at a side of the rear floor panel, an intersection where the rear floor member, the upper member, and the quarter panel intersect may form an inclined surface at a position higher than the rear floor panel, and the inclined surface may form a water movement path through which water is collected to a drainage area.

[0018] In an embodiment of the present disclosure, the water movement path can be connected to a side wall upper extension extending from a side flange of the rear floor panel, the side wall upper extension is attached to the longitudinal member of the rear floor component, and the side wall upper extension can be located on the longitudinal member side upper end surface of the rear floor component and the transverse member side upper member lower extension of the upper member.

[0019] In an embodiment of the present disclosure, the rear floor panel can change the drainage area by changing any one of the position, shape and number of the drainage holes, through which water is discharged to the outside. Due to the increase in the number of drainage holes, the entire part of the drainage area can be occupied by the drainage holes, and due to the modification of the shape of the drainage holes, the entire part of the drainage area can be removed and drainage holes can be formed.

[0020] In an embodiment of the present disclosure, a pickup truck having an underbody with a drainage structure for protecting a power electronics (PE) system may include: an underbody composed of a rear floor panel, wherein the PE system is located in a PE module portion, a rear floor member surrounding the side of the rear floor panel, an upper member located at the upper end of the rear floor panel, a quarter panel connected to the side of the rear floor member, and a bed floor forming a space under the bed floor with the rear floor panel, serving as a cabin as an indoor space; and a cargo compartment floor formed by the bed floor as a cargo compartment (deck) as an outdoor space, wherein relative to the drainage protection zone B of the PE raised portion in the rear floor panel, the surrounding portion is provided with a drainage guide area, and the front and rear portions are provided with drainage areas, an inclined surface may be formed at the intersection where the upper member and the quarter panel intersect in the rear floor member, and the inclined surface may be a moving path through which water introduced through the quarter panel is guided from the intersection to the drainage area.

[0021] In an embodiment of the present disclosure, a plurality of drain holes may be formed in the drain area, and any one of their positions, shapes, and numbers may be changed.

[0022] In an embodiment of the present disclosure, the rear floor panel and the upper member may separate the vehicle compartment from the cargo hold.

[0023] In an embodiment of the present disclosure, the quarter panel may be connected to a bedside trim covering a side portion thereof, and water may flow into a sidewall gap between the quarter panel and the bedside trim.

[0024] In a pickup truck, especially a pickup electric vehicle according to an embodiment of the present disclosure, an undercarriage having a drainage structure for protecting the PE system can be applied to prevent drainage to the RR PE in the EV pickup truck, thereby improving the safety of the vehicle, and especially the drainage performance of the body can be improved by smooth drainage at the lower end of the bed floor, thereby preventing water from flowing into the room and preventing water from stagnating at the rear floor panel of the body, thereby also improving the corrosion performance of the body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 2 is a structural diagram of an undercarriage having a drainage structure for protecting a PE system according to an embodiment of the present disclosure.

[0026] Figure 2 is an example of a water movement path in an undercarriage according to an embodiment of the present disclosure.

[0027] Figure 3 A moving state of water in a drainage structure for protecting a PE system applied to an undercarriage according to an embodiment of the present disclosure is shown.

[0028] Figure 4 This is an example of providing a drainage protection area in a rear floor panel according to an embodiment of the present disclosure.

[0029] Figure 5 The rear floor panel according to the embodiment of the present disclosure is in a deformed state passing through the drain hole.

[0030] Figure 6 A pickup truck is provided with an underbody having a drainage structure for protecting a PE system according to an embodiment of the present disclosure.

[0031] Figure 7 A drainage state of a drainage structure for protecting a PE system in a pickup truck to which an underbody is applied according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0032] The exemplary embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. These embodiments are merely examples and can be implemented in various forms by those skilled in the art. Therefore, the present disclosure is not necessarily limited to the exemplary embodiments disclosed herein.

[0033] refer to Figure 1The undercarriage 1 has a bilaterally symmetrical structure with respect to an undercarriage centerline OO, and includes a rear floor panel 10 , a rear floor member 20 , an upper member 30 , a quarter panel 40 and a bed floor 50 .

[0034] Specifically, the rear floor panel 10 can set the PE protrusion 15 as the drainage protection area B (see Figure 3 ) to exclude the PE protrusion 15 from the drainage movement path. The PE protrusion 15 can be the location for installing the PE system 60, so the undercarriage 1 can be described as an undercarriage 1 with a PE system protection drainage structure.

[0035] Specifically, in terms of the layout of the undercarriage 1 , the other components 20 , 30 , 40 , 50 based on the rear floor panel 10 are arranged as follows.

[0036] For example, the rear floor member 20 may be located below the rear floor panel 10 to surround the connecting portion 12, the PE mounting portion 13, and the rear portion 14, excluding the front portion 11 of the rear floor panel 10, and the upper member 30 may be located at the upper end of the rear floor panel 10, spanning the connecting portion 12, which is connected from the front portion 11 of the rear floor panel 10.

[0037] The quarter panel 40 connects the side of the rear floor member 20 at its side, and the bed floor 50 is located at the upper end of the rear floor panel 10 to cover the connecting portion 12, the PE mounting portion 13 and the rear portion 14, excluding the front portion 11 of the rear floor panel 10.

[0038] Specifically, the bed floor 50 has a flat structure that covers the upper surface of the rear floor panel 10 to allow cargo to be loaded. The bed floor may be a sheet molding compound (SMC) bed floor to ensure the marketability of the pickup truck.

[0039] Furthermore, the PE system 60 is located below the rear floor panel 10 and the rear floor member 20 and is protected by the PE mounting portion 13 at the connection portion 12 of the rear floor panel 10. The PE system may be a rear (RR) PE system.

[0040] Therefore, the lower vehicle body 1 is able to use the width of the upper member 30 or the internal space of the quarter panel 40 as the expected flooding area "A", and the drainage hole applicable area "a" can be set at the PE mounting portion 13 and the rear portion 14, excluding the front portion 11 and the connecting portion 12 of the rear floor panel 10.

[0041] Specifically, with regard to the configuration of the undercarriage 1 , the structures and shapes of the rear floor panel 10 , the rear floor member 20 , the upper member 30 , the quarter panel 40 , and the bed floor 50 are as follows.

[0042] For example, the rear floor panel 10 has a generally rectangular plate shape and may be composed of a plurality of panel members having height differences in the length direction, and the connection portion 12 and the PE mounting portion 13 may be formed using the space between the front portion 11 and the rear portion 14 dividing the front and rear directions as the middle portion.

[0043] Specifically, the connection portion 12 is connected to the PE mounting portion 13 via an extension surface 12a having a downwardly inclined structure, so that the PE mounting portion 13 and the rear portion 14 have a height difference relative to the front portion 11. The PE mounting portion 13 is formed with a PE protrusion 15 having a water blocking wall H to position the PE system 60, and a PE mounting hole 16 is drilled in front of the PE protrusion 15 so that the PE system 60 can be fastened with a bolt. Two PE mounting holes 16 can be formed at intervals, but three or more PE mounting holes can also be formed if necessary / desired.

[0044] The rear portion 14 is formed at its end with a vertical rear flange 14-1 having a rear width dimension to support one end of the lathe floor 50, thereby forming a space S under the lathe floor (see FIG. Figure 3 ).

[0045] The rear floor panel 10 has side flanges (19) vertically formed on the sides of the connection portion (12) (i.e., the extension surface (12a)), the PE mounting portion (13) and the rear portion (14), so that it can be easily fixed to the rear floor member 20 by welding.

[0046] Therefore, the rear floor panel 10 may have a downwardly inclined structure of the extension surface 12a of the connecting portion 12 located in the rear area of ​​the upper member 30 to move water to the drain hole applicable area a, and in the drain hole applicable area a, the PE mounting portion 13 and the rear portion 14 except the PE protrusion 15 form a drain hole 17 with a perforated structure.

[0047] Specifically, the drainage holes 17 are divided into a first drainage hole 17a, a second drainage hole 17b located at the PE mounting portion 13, and a third drainage hole 17c located at the rear portion 14, and each drainage hole 17a, 17b, 17c can have various shapes for facilitating drainage.

[0048] In addition to the first, second and third drainage holes 17a, 17b and 17c, the drainage hole 17 may further include a fourth drainage hole 17d (see FIG. Figure 5 ).

[0049] For example, the rear floor member 20 may have a generally "H"-shaped frame structure with front / rear longitudinal members (X-axis of the XY coordinates) reinforced by a plurality of left / right cross members (Y-axis of the XY coordinates) surrounding the rear floor panel 10, and the quarter panel 40 may have a generally "H"-shaped frame structure with the front / rear longitudinal members reinforced by the left / right cross members forming side walls, thereby forming a wheel house surrounding the tire.

[0050] The upper member 30 has a generally “U”-shaped frame structure, and left and right cross members connecting front and rear longitudinal members forming side walls are added to the upper end of the rear floor panel 10 and fixed by welding.

[0051] The lathe floor 50 has a substantially rectangular plate-like structure to form a space S under the lathe floor while covering the expected flooding area A.

[0052] Figures 2 to 4 An example is shown in which a drainage structure for protecting the PE system is provided in the lower vehicle body 1 .

[0053] refer to Figure 2 The heights of the rear floor member 20, the upper member 30 and the quarter panel 40 may all be higher than that of the rear floor panel 10, and the rear floor member 20 (i.e., the upper end surface of the longitudinal member) and the upper member 30 have inclined surfaces to allow water to flow toward the rear floor panel.

[0054] The rear floor panel 10 may include a side wall upper extension portion 19a formed on the side flange 19 at the position of the extension surface 12a of the connecting portion 12, and the side wall upper extension portion 19a surrounds a portion of the inclined surface of the rear floor member 20 located at the quarter panel side wall portion 40a of the quarter panel 40 (i.e., the inclined surface of the longitudinal member) to guide the movement of water.

[0055] The upper member 30 may form an inclined surface as the upper member lower extension 30a, and the upper member lower extension 30a may be positioned toward the sidewall upper extension 19a to guide the movement of water.

[0056] Therefore, in the drainage structure for protecting the PE system, a water movement path can be formed, in which water is collected by flowing along the extension surface 12a of the rear floor panel 10 at the intersection where the rear floor member 20, the upper member 30 and the quarter panel 40 intersect, and the water collected toward the PE mounting portion 13 can be discharged to the outside using the first drainage hole 17a (and the second and third drainage holes 17b and 17c) as a drainage path.

[0057] refer to Figure 3The lathe floor 50 is formed by placing the upper member flange 30-1 on the upper member 30 and the rear flange 14-1 vertically on the rear portion 14 side of the rear floor panel 10 (see Figure 1 ), a lathe floor lower space S is formed relative to the upper surface of the rear floor panel 10, and the rear floor panel 10 can use the PE raised portion 15 as a drainage protection area B, and the PE raised portion 15 protrudes toward the water blocking wall H relative to the PE mounting portion 13.

[0058] Specifically, as shown in the KK section, the PE raised portion 15 is raised higher than the PE mounting portion 13 using the water blocking wall H, so that water can naturally flow down to the surrounding of the PE raised portion 15, which can effectively guide the water to flow to the drainage hole 17 with the movement of the vehicle and gravity.

[0059] For example, the water blocking wall H may be an edge forming the height of the PE protrusion 15, and may have a structure in which three of the four surfaces of the edge are formed as protrusion edge inclined surfaces 15a to point to the front of the PE system 60, and the remaining one surface is formed as a protrusion rear inclined surface 15b to point to the rear of the PE system 60.

[0060] Therefore, the PE protrusion 15 may retain a small amount of water, but due to the effects of the protrusion edge inclined surface 15a and the protrusion rear inclined surface 15b, the water can move to another area without stagnation.

[0061] Therefore, a water movement path can be formed in opposite directions so that water flows through the extended surface 12a of the connecting portion 12 and the water flows through the raised portion edge inclined surface 15a of the PE raised portion 15, thereby forming a front water movement path in the front-to-rear direction of the drainage protection area B so that water converges to the PE mounting portion 13 and a rear water movement path so that water converges to the rear portion 14 through the raised portion rear inclined surface 15b of the PE raised portion 15.

[0062] The drainage path may include: a front drainage path, in which water collected in the PE mounting portion 13 is discharged to the outside through the first and second drainage holes 17a and 17b; and / or a rear drainage path, in which water collected in the rear portion 14 is discharged to the outside through the third drainage hole 17c; and may be formed along the front-to-rear direction of the drainage protection zone B.

[0063] Specifically, the height of the drainage protection area B is formed to be higher than that of the drainage area D by the water blocking wall H.

[0064] As described above, the drainage structure protecting the PE system can be divided into a drainage guide area C and a drainage area D relative to the drainage protection area B, and water falling onto the quarter panel 40 or the upper end surface of the rear floor member 20 can be gathered into the drainage area D through the drainage guide area C.

[0065] refer to Figure 4, discloses an example in which a drainage protection area B, a drainage guide area C, and a drainage area D are provided on the rear floor panel 10 .

[0066] For example, the drainage protection area B can be the PE protrusion 15, the drainage guide area C can be the extension surface 12a of the connecting portion 12 and the PE mounting portion 13 and the rear portion 14, excluding the PE protrusion 15, and the drainage area D can be the first and second drainage holes 17a and 17b of the PE mounting portion 13 and the third drainage hole 17c of the rear portion 14.

[0067] Specifically, among the first and second drainage holes 17a and 17b, the first drainage hole 17a is located in front of the PE protrusion 15 and is separated from the PE mounting hole 16 at a certain distance (X axis of the XY coordinate), and the second drainage hole 17b is located on the left and right sides of the PE protrusion 15 (Y axis of the XY coordinate) and is separated from the inclined surface 15a of the edge of the protrusion.

[0068] Therefore, the drainage protection zone B may be an area that prevents water from falling from the floor of the rear floor panel 10 and protects components of the PE system 60 located below the floor.

[0069] The drainage guide area C is used to guide water dropped on the rear floor panel 10 to the drainage area D.

[0070] The drainage area D is used to drain water dropped on the rear floor panel 10 through the drainage holes 17 .

[0071] Figure 5 The structure modification of the rear floor panel 10 according to the application method of the drain hole 17 in the embodiment is shown. The drain hole 17 can be formed in a combination of a circle, an ellipse, a rectangle, a diamond, a triangle and a step shape.

[0072] As shown in the figure, the rear floor panel 10 can directly use the PE mounting part 13 in the front part 11, the connecting part 12, the PE mounting part 13 and the rear part 14, or it can be modified into a drainage type PE mounting part 13a or a drainage type rear part 14a with the panel part removed by changing the position, shape and number of the drainage holes 17 in the drainage area D according to the high drainage performance of the vehicle.

[0073] For example, the rear floor panel 10 can keep the PE mounting portion 13 unchanged, the first drainage hole 17a can keep the position and shape of the hole unchanged, and the number of holes arranged to the left / right side (Y axis of the XY coordinate) can be increased to the number of holes evenly arranged in the entire part, thereby improving the drainage performance on the PE mounting portion 13 side.

[0074] On the other hand, when the PE mounting portion 13 of the rear floor panel 10 is changed to a drainage type PE mounting portion 13a, the first drainage hole 17a can be formed into one drainage hole by punching the entire portion of the first drainage hole and removing the corresponding panel, thereby improving the drainage performance on the PE mounting portion 13 side.

[0075] When the rear portion 14 of the rear floor panel 10 is changed into a drainage type rear portion 14a, the corresponding panel can be removed by punching holes on the entire portion of the third drainage hole to form a left-right symmetrical third drainage hole 17c. The corresponding panel can also be removed by punching holes on the panel portion above the third drainage hole 17c to form a left-right symmetrical fourth drainage hole 17d, thereby improving the drainage performance on the drainage type rear portion 14a side.

[0076] Therefore, the rear floor panel 10 can also reduce the weight of the panel by adopting the drainage type PE mounting portion 13a and / or the drainage type rear portion 14a.

[0077] Figure 6 and Figure 7 The function of the drainage structure for protecting the PE system in the pickup truck 100 to which the lower vehicle body 1 is applied according to an embodiment of the present disclosure is demonstrated.

[0078] refer to Figure 6 The pickup truck 100 may be a pickup electric vehicle and may have a cabin 110 with a driver's seat, which is an indoor space, and a cargo hold 120 with a cargo box, which is an outdoor space where cargo may be loaded and transported, and the cargo hold 120 may be formed as a lower vehicle body 1 .

[0079] For example, since the lower body 1 may have Figures 1 to 5 The lower vehicle body 1 has the same configuration as described in , so the rear floor panel 10 and the upper member 30 separate the vehicle compartment 110 from the cargo space 120 .

[0080] refer to Figure 7 , showing the drainage status of the drainage structure used to protect the PE system in the pickup truck 100.

[0081] As shown, the cargo space 120 may be formed with a bed floor 50 forming a floor, and with side walls formed with bed side trim panels 70 attached to the left and right sides of the quarter panels 40 .

[0082] As in the WW cross section, in the relationship between the rear floor panel 10 and the rear floor member 20, the upper end surface of the longitudinal member bonded to the side wall upper extension 19a of the side flange 19 of the rear floor panel 10 and located on the outer side of the rear floor panel 10 of the rear floor member 20 can be a downwardly inclined surface toward the PE mounting portion 13 side of the rear floor panel 10 at a position higher than one or more drainage areas D.

[0083] In the cargo area where the lathe floor 50 is located, a side wall gap G can be formed between the lathe floor 50 and the lathe side interior panel 70. The side wall gap G can serve as a channel for introducing water when the vehicle enters a puddle while driving, in the rain, or during car washing, so that water can flow into the space S under the lathe floor.

[0084] Therefore, when water falls from the lathe floor 50 onto the rear floor member 20 through the sidewall gap G, the upper end surface of the rear floor member 20 functions as a drainage guide area C to move the water to the PE mounting portion 13 , ie, the drainage area D.

[0085] Therefore, since the water is discharged to the outside through the first drainage hole 17 a of the PE mounting portion 13 , the PE system 60 located below the PE mounting portion 13 is not affected by the water during the process of discharging the water to the outside.

[0086] As described above, according to an embodiment of the present disclosure, in the lower vehicle body 1 having a drainage structure for protecting the PE system applied to a pickup truck 100, the PE raised portion 15 of the rear floor panel 10 that forms the lower space S of the bed floor with the bed floor 50 can utilize the water-blocking wall H to form the periphery of the PE system 60 into a drainage protection area B, thereby preventing water from draining to the top of the PE system 60, and in particular, preventing water from being retained at the corners due to preventing water from draining to the top of the PE system 60 through the drainage protection area B and the drainage guide area C, and preventing water from flowing into the room and being retained in the rear floor panel due to draining water to the lower end and sides of the bed floor through the drainage area D.

Claims

1. An undercarriage having a drainage structure for protecting a power electronics (PE) system, comprising: rear floor panels; a lathe floor connected to the upper end of the rear floor panel to form a space under the lathe floor; and A PE raised portion forms a periphery of a PE system located below the rear floor panel into a drainage protection zone using a water blocking wall, wherein the water blocking wall is configured to guide water from the PE raised portion to the drainage zone of the rear floor panel at a protruding height higher than that of the drainage zone.

2. The undercarriage according to claim 1, wherein the water blocking wall is an edge forming the height of the PE raised portion, wherein three of the four surfaces of the edge are raised portion edge inclined surfaces and point forward of the PE system, and wherein the remaining one of the four surfaces is a raised portion rear inclined surface and points rearward of the PE system. 3 . The undercarriage according to claim 2 , wherein the rear floor panel is configured to have a drain hole in the drain area to drain water to the outside of the rear floor panel. 4 . The undercarriage according to claim 3 , wherein the rear floor panel divides the drainage area into a front drainage area at a PE mounting portion and a rear drainage area at a rear portion with respect to the PE raised portion.

5. The undercarriage according to claim 4, wherein the rear floor panel forms a connection portion having an extension surface connected to the PE mounting portion, and wherein the extension surface has a downwardly inclined structure connected to the PE mounting portion, the downwardly inclined structure being configured to guide water. 6 . The undercarriage according to claim 5 , wherein the rear floor panel forms the extended surface and the rear portion together with a surrounding portion of the PE raised portion as a drainage guide area. 7 . The undercarriage according to claim 6 , wherein a front inclined structure and a rear inclined structure are applied to the drainage guide area and are configured to allow water to flow toward the drainage guide area by being inclined downward. 8 . The undercarriage according to claim 7 , wherein the front inclined structure is an extended surface of a connection portion connected to the PE mounting portion and an inclined surface of an edge of a raised portion of the PE raised portion. 9 . The undercarriage according to claim 7 , wherein the rear inclined structure is a portion of an inclined surface of a raised portion edge of a PE raised portion connected to a third drain hole located at a rear portion among the drain holes.

10. The undercarriage according to claim 1, wherein the rear floor panel is connected to a rear floor member surrounding a side portion of the rear floor panel located below the rear floor panel, wherein the upper member is located at the upper end of the rear floor panel, and The quarter panel is connected to the side of the rear floor member at the side of the rear floor panel.

11. The undercarriage according to claim 10, wherein an intersection where the rear floor member, the upper member, and the quarter panel intersect forms an inclined surface at a position higher than the rear floor panel, and The inclined surface forms a water movement path configured such that water is collected in the drainage area through the path.

12. The undercarriage according to claim 11, wherein the water movement path is connected to a side wall upper extension extending from a side flange of the rear floor panel, the side wall upper extension being attached to a longitudinal member of the rear floor member, and The side wall upper extension portion is located on the upper end surface of the rear floor member on the longitudinal member side and the upper member lower extension portion of the upper member on the transverse member side. 13 . The undercarriage according to claim 1 , wherein the rear floor panel is configured to change the drainage area using any one of positions and shapes of drainage holes and the number of drainage holes through which water is drained to the outside of the vehicle body.

14. The undercarriage according to claim 13, wherein due to the increase in the number of the drain holes, the entire portion of the drain area is occupied by the drain holes.

15. The undercarriage according to claim 13, wherein due to the modification of the shape of the drain hole, an entire portion of the drain area is removed and formed as the drain hole.

16. A pickup truck comprising: An undercarriage having a drainage structure for protecting a power electronics (PE) system, wherein the undercarriage comprises: Rear floor panel, PE system on which is located the PE module part, a rear floor member surrounding a side portion of the rear floor panel, an upper member located at the upper end of the rear floor panel, a quarter panel connected to the side of the rear floor member, and a lathe floor panel, which forms a space under the lathe floor with the rear floor panel; the cabin, which is the interior space; and The cargo hold, which is an outdoor space whose cargo hold floor is formed by the lathe floor, Among them, relative to the drainage protection area of ​​the PE raised part in the rear floor panel, the surrounding part is provided with a drainage guide area, and the front and rear parts are provided with drainage areas. wherein the inclined surface is located at the intersection of the upper member and the quarter panel in the rear floor member, and The inclined surface is configured as a movement path, through which water introduced through the quarter panel is guided from the intersection to the drainage area.

17. The pickup truck of claim 16, wherein the drainage area includes a plurality of drainage holes.

18. The pickup truck of claim 16, wherein the rear floor panel and the upper member separate the vehicle bed and the cargo bed.

19. The pickup truck of claim 16, wherein the quarter panel is connected to a bed side trim panel covering a side portion thereof and is configured to allow water to flow into a sidewall gap between the quarter panel and the bed side trim panel.

20. An underbody of a pickup truck having a drainage structure for protecting a power electronic (PE) system, comprising: rear floor panels; a lathe floor connected to the upper end of the rear floor panel to form a space under the lathe floor; and A PE cover portion of the PE system is located below the rear floor panel, wherein the PE cover portion forms part of a drainage structure configured to direct water on the PE cover portion away from the PE system to a drainage area of ​​the rear floor panel.

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