JP2012192808A - Vehicular lower body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple structure capable of improving at least performance against a front collision related to the connection of a battery unit 21 in a vehicular lower body structure in which the battery unit 21 is connected to a vehicle body member under a vehicular compartment floor (vehicular compartment floor panel 1).SOLUTION: The battery unit 21 is provided with a side connector 481 connected to the under surface of a vehicle body member (front floor frame 7). A first projection 51 whose at least part is disposed to be opposite to the side connector 481 in a vehicle longitudinal direction is provided forward of the side connector 481 on the under surface of the vehicle body member such as to project downward. The bolt hole 48d of the side connector 481 is formed in the form of an elongated hole in the vehicle longitudinal direction so that a distance L1 between the shaft of a bolt 482 and the rear edge of the bolt hole 48d is longer than a distance L2 between the front end of connector 481 and the rear end of the first projection 51.

Description

  The technology disclosed herein relates to a lower body structure of a vehicle in which a battery unit is mounted on the lower side of a passenger compartment floor.

  Generally, in an electric vehicle such as an electric vehicle, a plurality of battery modules are mounted in a united state below the passenger compartment floor. Such a battery unit is usually coupled to a vehicle body member. For example, Patent Document 1 has a configuration in which both ends of a plurality of girder members attached to a battery unit with a space in the front-rear direction of the vehicle body are fastened by bolts to the lower surfaces of two side members extending in the front-rear direction of the vehicle body. Are listed. The use of the bolt connection facilitates the attachment and detachment of the battery unit, and thus is superior in terms of assembly and maintenance of the battery unit as compared with a configuration in which the battery unit is connected to the vehicle body member by welding or the like.

  This Patent Document 1 also describes a protector member that is attached so as to protrude downward at a position in front of the battery unit on the lower surface of each side member from the viewpoint of preventing road surface interference of the battery unit. .

JP 2009-83598 A

  By the way, since the battery unit described above is heavy, it has a large inertial force. For example, when the vehicle unit collides in the front-rear direction such as the front collision or the rear collision, the battery unit tends to move relative to the vehicle body member in the front-rear direction. On the other hand, the connection between the battery unit and the vehicle body member is preferably a bolt connection as described above. In this case, a large shearing force is applied to the bolt connection portion due to the relative movement of the battery unit at the time of a collision in the front-rear direction. Therefore, if sufficient measures are not taken, there is a risk that the bolt joint will be sheared and destroyed. Measures include forming bolts and bolt hole forming members with high-strength materials, and increasing the number of bolt connections, but these measures all increase vehicle weight and cost. This will lead to an increase and a decrease in productivity.

  The technology disclosed herein has been made in view of such a point, and the object thereof is to provide a battery unit in a lower vehicle body structure of a vehicle in which a battery unit is coupled to a vehicle body member below a passenger compartment floor. It is to improve at least the front impact performance related to the coupling with a simple structure.

  The technology disclosed herein relates to a lower vehicle body structure of a vehicle in which a battery unit including a battery module, an electrical component, and a support member that supports the battery module and the electrical component is mounted below the passenger compartment floor.

  In this lower vehicle body structure, at least one side coupling portion that is coupled to the lower surface of the vehicle body member is provided at each end of the battery unit in the vehicle width direction, and the side coupling portion includes the A bolt hole for connecting the battery unit to the vehicle body member by a bolt is formed, and at least a part of the lower surface of the vehicle body member is at a front side position in the vehicle longitudinal direction with respect to the side connection portion. A first projecting portion disposed so as to face the vehicle body longitudinal direction with respect to the side coupling portion is provided so as to protrude downward, and the bolt hole is provided behind the bolt shaft and the bolt hole. It is formed in the shape of a long hole in the longitudinal direction of the vehicle body so that the distance from the end edge is wider than the distance between the front end of the side coupling portion and the rear end of the first projecting portion.

  Here, a plurality of side coupling portions may be provided at each end portion on both sides in the vehicle width direction of the battery unit. When a plurality of side coupling portions are provided in this way, the first projecting portion is provided. May be disposed on the front side of any one of the side coupling portions, or may be disposed on the front side of each of the two or more side coupling portions.

  In addition, disposing the first projecting portion so that at least a part of the first projecting portion faces the vehicle body longitudinal direction with respect to the side coupling portion means that the first projecting portion and the side coupling portion are connected to the vehicle. This means that at least a part of each of the width direction and the vertical direction (height direction) is overlapped. That is, as will be described later, when the battery unit moves relative to the vehicle body member in the longitudinal direction of the vehicle body, the first protruding portion is arranged so that the first protruding portion and the side coupling portion come into contact with each other. It is.

  According to this configuration, the battery unit is mounted on the lower side of the passenger compartment floor by bolting the side coupling portions provided at both ends in the vehicle width direction to the vehicle body member. Bolt connection facilitates the detachment of the battery unit and improves its assembling and maintenance.

  Thus, in the above-described configuration, the first projecting portion is provided so as to protrude downward from the lower surface of the vehicle body member at a front side position in the vehicle longitudinal direction with respect to the side coupling portion. The projecting portion is arranged so that at least a part thereof is opposed to the side coupling portion in the longitudinal direction of the vehicle body. For this reason, during the frontal collision of the vehicle, the battery unit, which is a heavy object, tries to move forward relative to the vehicle body member due to inertial force. It comes to contact the part. By this contact, the first projecting portion bears a load, and the battery unit is prevented or suppressed from moving forward relative to it. On the other hand, the bolt hole formed in the side coupling portion has a distance between the shaft portion of the bolt passed therethrough and the rear end edge of the bolt hole so that the front end of the side coupling portion and the first projecting portion are behind. Since it is formed in the shape of a long hole in the longitudinal direction of the vehicle body so as to be wider than the distance from the end, relative movement of the battery unit is avoided by the side coupling portion coming into contact with the first protruding portion. In the restrained state, the shaft portion of the bolt does not hit the rear end edge of the bolt hole. As a result, it is avoided or suppressed that a shearing force acts on the bolt coupling portion, and the front collision performance related to the coupling of the battery units is enhanced.

  In addition, since this configuration only provides the first projecting portion on the vehicle body member, a significant increase in vehicle weight, an increase in cost, and a decrease in productivity are avoided.

  In addition, since the first projecting portion is provided to project downward from the lower surface of the vehicle body member at a position on the front side of the side coupling portion, the first projecting portion is coupled to the lower surface of the vehicle body member as well as improving the front collision performance. This is also advantageous in preventing road surface interference of the side coupling portion.

  The first protruding portion may protrude outward from the outer end in the vehicle width direction of the side coupling portion.

  By doing so, the first projecting portion projecting downward from the lower surface of the vehicle body member prevents road surface interference of the side coupling portion when the vehicle body is tilted in the roll direction, for example, during wheel removal. This is advantageous.

  A front end edge of the side coupling portion and a rear end edge of the first projecting portion, which are opposed to the longitudinal direction of the vehicle body, may be formed to be parallel to each other.

  Accordingly, the side coupling portion and the first projecting portion come into contact with each other in parallel with the relative movement of the battery unit at the time of the front collision, so that the load is effectively dispersed. Thus, further relative movement of the battery unit is more reliably prevented.

  The side coupling portion includes a contact portion that is in contact with a lower surface of the vehicle body member and is formed with the bolt hole, and a front wall portion that stands downward from a front end of the contact portion. The wall portion may be opposed to the rear end surface of the first projecting portion so as to be parallel to each other.

  As a result, the side coupling portion and the first projecting portion come into contact with each other in parallel with the relative movement of the battery unit at the time of the front collision, so that the load is more effectively dispersed. In addition, further relative movement of the battery unit is more reliably prevented. As a result, the breakage of the bolt coupling portion is surely avoided, and the front collision performance related to the coupling of the battery units is further enhanced.

  A second protrusion is disposed on the lower surface of the vehicle body member so that at least a part thereof is opposed to the lateral coupling portion in the longitudinal direction of the vehicle body at a rear position in the longitudinal direction of the vehicle with respect to the lateral coupling portion. The bolt hole is provided so that the distance between the shaft portion of the bolt and the front edge of the bolt hole is the rear end of the side coupling portion and the second protruding portion. It may be formed in a long hole shape in the longitudinal direction of the vehicle body so as to be wider than the distance from the front end of the vehicle body.

  Here, when a plurality of side coupling portions are provided, the second projecting portion may be disposed on the rear side of any one of the side coupling portions, or two or more side coupling portions. You may arrange | position on each back side. Moreover, the 1st protrusion part may be arrange | positioned in the front side of the same side coupling part, and the 2nd protrusion part may be arrange | positioned in the back side, and the 1st protrusion part and the 2nd protrusion part are different. You may arrange | position on the front side and back side with respect to a side coupling part.

  Further, as in the case of the first projecting portion, the second projecting portion may be “arranged so that at least a part thereof is opposed to the side coupling portion in the vehicle longitudinal direction”. This means that the installation portion and the side coupling portion are arranged so that at least a part thereof overlaps in each of the vehicle width direction and the vertical direction (height direction). This means that the second projecting portion is arranged so that the second projecting portion and the side coupling portion come into contact with each other.

  In contrast to the above, this configuration is advantageous at the time of rear collision. That is, at the time of rear collision of the vehicle, the battery unit tends to move rearward relative to the vehicle body member, but protrudes downward from the lower surface of the vehicle body member at a rear position in the vehicle longitudinal direction with respect to the side coupling portion. By providing the second projecting portion in such a manner, the side coupling portion comes into contact with the second projecting portion, the load is borne by the second projecting portion, and the battery unit is further increased. The relative movement backward is avoided or suppressed. On the other hand, the bolt hole formed in the side coupling portion has a distance between the shaft portion of the bolt passed therethrough and the front end edge of the bolt hole so that the rear end of the side coupling portion and the front end of the second projecting portion Is formed in the shape of a long hole in the front-rear direction so as to be wider than the distance between the side and the side coupling portion abuts against the second projecting portion, thereby avoiding or suppressing the relative movement of the battery unit. In this state, the bolt shaft does not contact the front end edge of the bolt hole. As a result, it is avoided or suppressed that the shearing force acts on the bolt coupling portion, and the rear impact performance related to the coupling of the battery units is enhanced.

  The rear end edge of the side coupling portion and the front end edge of the second projecting portion, which are opposed to the longitudinal direction of the vehicle body, may be formed to be parallel to each other.

  By doing so, the load is effectively dispersed when the side coupling portion and the second projecting portion abut at the time of the rear collision, and further relative movement of the battery unit is more reliably prevented. .

  The side coupling portion includes a contact portion that is in contact with a lower surface of the vehicle body member and is formed with the bolt hole, and a rear wall portion that rises downward from a rear end of the contact portion, The rear wall portion may be opposed to the front end surface of the second projecting portion so as to be parallel to each other.

  As a result, when the side coupling portion and the second projecting portion come into contact with each other at the time of rear collision, the load is more effectively distributed, and further relative movement of the battery unit is further prevented more reliably. As a result, breakage of the bolt coupling portion is surely avoided, and the rear impact performance related to the coupling of the battery units is further enhanced.

  Each of the first projecting portion and the second projecting portion may protrude below the lower end of the battery unit.

  This configuration is advantageous in preventing not only the side coupling portion but also the road surface interference of the battery unit.

  The vehicle body member includes at least a member extending in the vehicle longitudinal direction at an outer position in the vehicle width direction, and a torque box. The side coupling portion and the first and second projecting portions are both in the vehicle longitudinal direction. It is good also as arrange | positioning in the vicinity of the member extended in a direction, and the vicinity of the said torque box.

  Here, the “member extending in the vehicle longitudinal direction at the outer position in the vehicle width direction” includes a front floor frame and a side sill, each of which is a highly rigid body member, and a front floor frame (or front side frame). The torque box that joins the side sill is also a highly rigid body member.

  That is, by providing the first and second projecting portions in the vicinity of such a high-strength vehicle body member, the first and second projections can be obtained when the side coupling portion abuts during the front collision and the rear collision. The installation part reliably receives the load associated with the relative movement of the battery unit, and can more reliably prevent the relative movement of the battery unit described above.

  A power unit and a suspension cross member are arranged at a front position in the vehicle longitudinal direction relative to the battery unit, and the power unit, the suspension cross member and the battery unit are arranged in this order in the vehicle longitudinal direction and in the vehicle longitudinal direction. Part of the suspension cross member on both sides in the vehicle width direction is arranged so as to overlap with each other in the vehicle width direction and the vertical direction with respect to the first projecting portion. A front end surface of the one projecting portion is inclined obliquely downward toward the rear, and a front end position of the battery module and the electronic component in the battery unit is a rear side in a vehicle longitudinal direction with respect to a front end of the first projecting portion. It may be set to.

  With this configuration, at the time of a front collision, first, a collision load is input to the power unit, and the collision load is transmitted to the suspension cross member disposed so as to face the rear of the power unit as the power unit retreats. As a result, the suspension cross member also moves backward together with the power unit. However, a part of the suspension cross member on both sides in the vehicle width direction is mutually in the vehicle width direction and the vertical direction with respect to the first projecting portion. Since they are arranged with an overlap, a part of the both sides in the vehicle width direction of the reversing suspension cross member abuts on the front end surface of the first projecting portion. Since the front end surface is inclined obliquely downward toward the rear, the retreating suspension cross member moves downward so as to be guided by the front end surface of the inclined first projecting portion. .

  On the other hand, although the battery unit is arranged behind the suspension cross member so as to face the suspension cross member, the front end positions of the battery module and the electronic components constituting the battery unit are located from the front end of the first projecting portion. Is also set on the back side. For this reason, the retracting suspension cross member is guided obliquely downward rearward by the front end surface of the first projecting portion before coming into contact with the battery module and the electronic component. Thus, the battery module and the electrical components in the battery unit are prevented from being hit, and the battery module and the electrical components are prevented from being damaged.

  As described above, according to the lower body structure of the vehicle, a load is borne by the side coupling portion of the battery unit coming into contact with the first projecting portion during the frontal collision of the vehicle, and the battery unit However, when the side coupling portion and the first projecting portion are in contact with each other, the bolt shaft portion and the rear end edge of the bolt hole are separated from each other. Since it does not hit, it is avoided thru | or suppressed that a shearing force acts on a volt | bolt coupling | bond part, and the front-impact performance concerning the coupling | bonding of a battery unit can be improved.

It is a bottom view which shows the structure of the lower side of the compartment floor panel of a vehicle. It is a perspective view which shows a battery unit. It is a perspective view which shows the state which removed the upper cover member of the battery unit. It is a bottom view which expands and shows the site | part in which the 1st protrusion part and the 2nd protrusion part were provided in the lower side of the compartment floor panel. It is VV sectional drawing of FIG. It is VI-VI sectional drawing of FIG.

  Hereinafter, an embodiment of a lower body structure of a vehicle will be described with reference to the drawings. In addition, the following description of preferable embodiment is an illustration. FIG. 1 shows a lower structure of a vehicle compartment floor panel 1 (which constitutes a vehicle compartment floor) of an electric vehicle (in this embodiment, an electric vehicle, hereinafter simply referred to as a vehicle). Front, rear, left, right, up and down for this vehicle are simply referred to as front, back, left, right, up and down, respectively. Moreover, in FIGS. 1-5, the vehicle front side is shown by the arrow Fr.

  The passenger compartment floor panel 1 includes a front floor portion 1a and a rear floor portion 1b positioned at a height position above the front floor portion 1a. Although not clearly shown in the figure, a stepped kick-up portion is provided between the front floor portion 1a and the rear floor portion 1b, and the height position of the rear floor portion 1b is higher than that of the front floor portion 1a. It is high.

  A rear seat (not shown) is disposed on the upper surface of the rear floor portion 1b, and the upper surface of the rear portion of the front floor portion 1a is a footrest for passengers seated on the rear seat. A driver seat and a passenger seat (both not shown) are arranged in the vehicle width direction on the upper surface of the front portion of the front floor portion 1a.

  A front end portion of the front floor portion 1a is coupled to a lower end portion of a dash panel (not shown). Both ends of the front floor portion 1a in the vehicle width direction are coupled to a pair of left and right side sills 12 extending in the front-rear direction.

  A pair of left and right front floor frames extending in the front-rear direction are located on the inner side in the vehicle width direction of the lower surface of the front floor portion 1a (both in the vehicle width direction of the floor tunnel portion 1c shown only in FIG. 6). 7 is provided integrally with the passenger compartment floor panel 1. Each front floor frame 7 is slightly inclined inward in the vehicle width direction toward the rear. That is, the interval between the left and right front floor frames 7 is reduced toward the rear. As shown in FIGS. 4 and 6, the front end portions 70 of the left and right front floor frames 7 are respectively connected to the rear end portions of the left and right front side frames 8 in a state of being inserted into the hollow cross section at the rear end portions. ing.

  Returning to FIG. 1, between the rear end of the left front side frame 8 and the front end of the left side sill 12, and between the rear end of the right front side frame 8 and the front end of the right side sill 12. Are provided with torque boxes 15 for coupling the front side frame 8 and the side sill 12 to each other. As described above, since the front end portion 70 of the front floor frame 7 is inserted into the rear end portion of the front side frame 8, the torque box 15 may be rephrased as connecting the front floor frame 7 and the side sill 12. These torque boxes 15 increase the bending rigidity of the kick portion 8a (see FIG. 5) in which the height position of the front side frame 8 changes (becomes gradually lower toward the rear side), so that the portion of the torque box 15 during a frontal collision of the vehicle It is intended to prevent bending.

  The rear end portion of the rear floor portion 1 b is connected to the front end portion of the cargo compartment floor panel 3. A spare tire pan (not shown in the figure) is formed on the cargo floor panel 3 so as to bulge downward. A pair of left and right rear side frames 9 extending in the front-rear direction are provided at both ends in the vehicle width direction on the lower surfaces of the rear floor portion 1 b and the cargo floor panel 3. The front end portions of the left and right rear side frames 9 are connected to the rear end portions of the left and right side sills 12, respectively. A rear cross member 10 extending in the vehicle width direction and connecting the left and right rear side frames 9 is provided at the rear end portion of the lower surface of the rear floor portion 1b. The distance between the left and right rear side frames 9 is larger than the distance between the left and right front floor frames 7.

  A suspension cross member 16 that extends in the vehicle width direction and supports the left and right front wheel suspension arms 17 is disposed at a front-rear position corresponding to the kick portion 8a of the front side frame 8 (front side of a battery unit 21 described later). . Although illustration is omitted, the left and right sides of the front portion of the suspension cross member 16 are respectively coupled to the front portions of the left and right front side frames 8 relative to the kick portions 8a. Further, as shown in FIG. 1, the rear end edge of the suspension cross member 16 is curved so that the center portion in the vehicle width direction is located in front of the both end portions. At both ends in the width direction, rear side coupling portions 16b (parts where through holes through which bolt shafts extending downward from the lower surface of the torque box 15 are inserted) are respectively coupled to the lower surfaces of the left and right torque boxes 15. Is provided.

  A power unit 71 for driving the vehicle is provided immediately in front of the suspension cross member 16. Although the detailed configuration is omitted, the power unit 71 includes a motor unit 72 including a motor and a power transmission mechanism (a speed reduction mechanism and a differential mechanism) for transmitting the driving force of the motor of the motor unit to the front wheels. The transaxle 73 is integrally coupled so as to be aligned in the vehicle width direction. The axis of the motor shaft of the motor unit (that is, the drive shaft), the axis of the input shaft connected to the motor shaft in the transaxle (deceleration mechanism), and the output shaft of the power unit 71 (that is, the transaxle (differential mechanism)) The shaft center of a joint shaft (connected to the front wheel drive shaft via a constant velocity joint) that is an output shaft extends in the vehicle width direction. Further, the shaft center of the power unit 71 as a whole also extends in the vehicle width direction.

  Both ends of the power unit 71 in the vehicle width direction are elastically supported by the left and right front side frames 8 via a bracket (not shown) and a mount body including a rubber bush. As shown in FIG. 1, the lower portion of the central portion of the power unit 71 in the vehicle width direction is connected to the suspension cross member 16 via a torque rod 101. The elastic support at both ends in the vehicle width direction of the power unit 71 causes the entire power unit 71 to rotate (swing) around an axis extending in the vehicle width direction. However, the torque rod 101 has the entire power unit 71 mounted on the shaft. Regulates turning around too much. A front end portion of the torque rod 101 is connected to a center portion in the vehicle width direction of the power unit 71 via a rubber bush 102 so as to be rotatable about an axis extending in the vehicle width direction, and a rear end portion of the torque rod 101 is connected to the rubber bush Through 103, the suspension cross member 16 is coupled to the vehicle width direction center portion of the suspension cross member 16 so as to be rotatable around an axis extending in the vehicle width direction.

  The power unit 71, the suspension cross member 16, and a battery unit 21 described later are arranged in this order from the front side to the rear side, and are not shown in detail, but are arranged so as to overlap each other in the vertical direction. That is, the suspension cross member 16 and the battery unit 21 are at the same height position, and they are at the same height position as the lower portion of the power unit 71 (the same height position as the torque rod 101).

  FIG. 2 shows a battery unit 21 mounted on the lower side of the passenger compartment floor panel 1. The front, rear, left, right, upper and lower of the battery unit 21 described below are respectively the front, rear, left, right, upper and lower when the battery unit 21 is mounted on the vehicle. It is the same as the front, rear, left, right, top and bottom for the vehicle.

  1-3, the battery unit 21 includes a plurality of battery modules 221, 222, frame members 40, 60 as support members for supporting the plurality of battery modules 221, 222, and an upper cover member 23. And a lower cover member 24. That is, a plurality of battery modules 221 and 222 are mounted in a united state below the passenger compartment floor panel 1. The battery unit 21 is continuously provided on the rear side of the first mounting portion 21a mounted on the lower side of the front floor portion 1a, and on the lower side of the rear floor portion 1b. And a second mounting portion 21b. As will be described in detail later, in the battery unit 21, a plurality of battery modules 221, 222 are arranged on the first mounting portion 21a and the second mounting portion 21b, respectively, so that the front side and the rear side are arranged. It is distributed.

  The upper cover member 23 and the lower cover member 24 cover the periphery of the plurality of battery modules 221 and 222. That is, a space for accommodating the battery modules 221 and 222 and the frame members 40 and 60 is formed between the upper and lower cover members 23 and 24. However, a part of the frame members 40 and 60 protrudes outward from between the peripheral edge portion of the upper cover member 23 and the peripheral edge portion of the lower cover member 24, so that the outer surface of the frame members 40 and 60 is Some face the open air.

  The upper cover member 23 is divided into a first part 23a and a second part 23b. The first part 23a is located on the first mounting part 21a, and the second part 23b is located on the second mounting part 21b. The upper surface of the second portion 23b is located at a height position above the upper surface of the first portion 23a, corresponding to the height positions of the front floor portion 1a and the rear floor portion 1b. Further, as shown in FIG. 1, the lower cover member 24 is divided into a first part 24a and a second part 24b. The first part 24a is located on the first mounting part 21a, and the second part 24b is Located on the second mounting portion 21b. The lower surfaces of the first portion 24a and the second portion 24b of the lower cover member 24 are at the same height position.

  The upper cover member 23 has an air inlet 37 for introducing air into the battery unit 21 (a space in which the battery modules 221 and 222 are accommodated), and an air outlet for discharging the air inside the battery unit 21. 38 is formed. Two air introduction ports 37 are formed at the center of the upper surface of the first portion 23a in the front-rear direction so as to open upward. Each air introduction port 37 is not shown in the figure, but is used for the passenger compartment. The duct for the air outlet in the air conditioner, more precisely, it is arranged below the driver's seat and the passenger seat and guides conditioned air to the outlet that blows out the conditioned air to the feet of the passenger seated in the rear seat. Therefore, it is connected to a duct disposed on the passenger compartment floor panel 1. The air exhaust port 38 is a rear end portion in the front-rear direction of the upper surface of the second portion 23b, and is formed so as to open upward at the center portion in the vehicle width direction. Although illustration is omitted, the air discharge port 38 is located below the passenger compartment floor panel 1 and in the vicinity of the vehicle front-rear position corresponding to the seat back of the rear seat.

  As shown in FIG. 3, a fan 39 for discharging the air in the battery unit 21 is disposed in the battery unit 21. Although not shown in detail, the air discharge port 38 and the fan 39 are not shown. Are connected to each other via a duct. The conditioned air sent from the air conditioner is introduced into the battery unit 21 via the air introduction port 37, and the temperature of each of the battery modules 221 and 222 arranged there, that is, cooling or warming up is performed. . Further, the air after the temperature adjustment of the battery modules 221 and 222 is discharged out of the battery unit 21 through the air discharge port 38 by the operation of the fan 39.

  At the front end of the battery unit 21, an inverter connection terminal 31 for electrically connecting the battery unit 21 and an inverter (not shown) disposed above the power unit 71 is disposed. Electric power is supplied from the battery unit 21 to the motor of the motor unit 72 in the power unit 71 via the inverter. The inverter connection terminal 31 is supported by an inverter connection terminal support portion 44 (see FIG. 3) provided in the front portion 41a of the frame member 40 as described later.

  As shown in FIG. 3, among the plurality of battery modules 221 and 222 in the battery unit 21, the battery module 221 mounted on the first mounting portion 21a and the battery module 222 mounted on the second mounting portion 21b are: , Their shapes are different from each other. The battery module 221 mounted on the first mounting portion 21a has a length in the front-rear direction that is significantly longer than the width in the vehicle width direction and the height in the vertical direction, and has an elongated shape in the front-rear direction. Two long battery modules 221 are arranged in the first mounting portion 21a with an interval in the vehicle width direction.

  On the other hand, the battery module 222 mounted on the second mounting portion 21b is about half the length in the front-rear direction of the long battery module 221 mounted on the first mounting portion 21a. In the second mounting portion 21b, four short battery modules 222 are arranged side by side in the vehicle width direction, and three of them are stacked in the vertical direction, and the second mounting portion 21b includes a short battery. A total of twelve modules 222 are arranged.

  The battery unit 21 also includes a plurality of electric components 25 such as an ECU and a contactor related to charge / discharge control for the battery modules 221 and 222, and the electric components 25 are connected to the first mounting portion. They are arranged at a position between the two battery modules 221 in 21a, a position behind the battery module 221 in the first mounting portion 21a, and a position above the battery module 222 in the second mounting portion 21b. The above-described fan 39 is also disposed at a position behind the battery module 221 in the first mounting portion 21a. The fan 39 includes the battery module 221 mounted in the first mounting portion 21a and the second mounting portion. It is arranged at a position between the battery module 222 mounted on the part 21b.

  The first mounting portion 21a has a frame member 40 that supports the plurality of battery modules 221 in the first mounting portion 21a, and the second mounting portion 21b supports the plurality of battery modules 222 in the second mounting portion 21b. A frame member 60 is provided.

  The frame member 40 of the first mounting portion 21a is formed in a frame shape including a front portion 41a, a rear portion 41b, and a pair of left and right side portions 41c. The front portion 41a of the frame member 40 extends in the vehicle width direction, and both end portions thereof are connected to the front end portions of the left and right side portions 41c extending in the front-rear direction. The rear portion 41b of the frame member 40 extends to the outside in the vehicle width direction from the left and right side portions 41c, and the both side portions 41c are connected to the intermediate portion in the vehicle width direction of the rear portion 41b. That is, the both side portions 41c are respectively provided at both ends in the vehicle width direction of the first mounting portion 21a, and extend along the front floor frames 7, 7 from the front end portion of the second mounting portion 21b toward the front side. It extends while tilting. An inverter connection terminal support 44 that supports the inverter connection terminal 31 is provided at the front portion 41 a of the frame member 40. The rear portion 41b and both side portions 41c of the frame member 40 are rectangular in cross section and hollow inside.

  Four side coupling portions 48 are provided on the outer surface in the vehicle width direction of each side portion 41c of the frame member 40 at predetermined intervals. Each side coupling portion 48 is fastened and fixed to the left and right front floor frames 7 by bolts 482 (see FIGS. 1 and 4; FIG. 4 shows only the cross section of the shaft portion of the bolt 482). Among these, the two front left and right side coupling portions 48 (hereinafter, this side coupling portion is particularly referred to as a first side coupling portion 481), as shown in FIG. It is fixed to a connecting portion with the side frame 8 (a portion where the front floor frame 7 and the front side frame 8 are overlapped and located in the vicinity of the torque box 15). That is, the foremost first side coupling portion 481 is coupled to the vicinity of the torque box 15 in the front floor frame 7. Thus, by attaching the battery unit 21 to the vehicle body by bolt connection, the battery unit 21 can be easily attached and detached, and the assembly and maintenance of the battery unit 21 can be improved.

  The left and right end portions 49 of the rear portion 41b of the frame member 40 are fastened and fixed to a connecting portion between the left rear side frame 9 and the left side sill 12, and a connecting portion between the right rear side frame 9 and the right side sill 12, respectively. The

  The frame member 60 of the second mounting portion 21b has a frame shape including a front portion and a rear portion extending in the vehicle width direction, and a pair of left and right side portions respectively connecting the front and rear portions in the vehicle width direction. Is formed. The front portion of the frame member 60 is connected and integrated with the rear portion 41b of the frame member 40 of the first mounting portion 21a. The distance between both side portions of the frame member 60 is larger than the distance between both side portions 41 c of the frame member 40. That is, the length of the second mounting portion 21b in the vehicle width direction is set to be larger than the length of the first mounting portion 21a in the vehicle width direction.

  Then, as shown in FIG. 1, in each side portion 41c of the frame member 40 of the first mounting portion 21a described above, a first protrusion is provided in the vicinity of the first side coupling portion 481 positioned at the foremost side. Two projecting portions of the portion 51 and the second projecting portion 52 are provided for the front floor frame 7 to the torque box 15.

  4-6, the 1st protrusion part 51 is arrange | positioned ahead of the 1st side coupling | bond part 481, and the coupling | bond part of the front floor frame 7 and the front side frame 8, and torque It is provided so as to protrude downward from the lower surface of the box 15. In this embodiment, the first projecting portion 51 includes a front vertical wall 511 disposed on the front side, a rear vertical wall 512 disposed adjacent to the first side coupling portion 481, a front vertical wall 511, and a rear side. It includes vertical walls 513 and 514 on the left and right sides in the vehicle width direction that are arranged between the vertical walls 512 and a bottom wall 515 that connects the lower end edges of these vertical walls to each other, and has a generally rectangular box shape as a whole. It is configured. The first projecting portion 51 is fixed to the front floor frame 7 (front side frame 8) and the torque box 15 by welding or bolt connection, for example.

  More specifically, the first projecting portion 51 is disposed such that a part of the inner side in the vehicle width direction is opposed to the first side coupling portion 481 in the front-rear direction. The outer side of 51 in the vehicle width direction is formed so as to protrude outward from the outer end of the first side coupling portion 481. As is apparent from FIGS. 5 and 6, the first projecting portion 51 is provided so as to protrude downward from the first side coupling portion 481, and the battery unit 21 and the battery module 221 (and 222). It protrudes from the lower end to the lower side.

  Here, the shape of the first side coupling portion 481 will be described in detail with reference to FIGS. 4 and 5. The first side coupling portion 481 is in contact with the lower surface of the front floor frame 7. And a front wall portion 48b standing downward from the front end of the contact portion 48a, and a rear wall portion 48c rising downward from the rear end of the contact portion 48a. It is comprised so that. As shown in an end view in FIG. 4, the abutting portion 48 a has a front end edge and a rear end edge that extend from the base end attached to the side portion 41 c of the frame member 40 toward the front end in the vehicle width direction. By inclining so as to approach, it is formed to become gradually narrower. As a result, the front wall portion 48b is also inclined rearward from the base end in the vehicle width direction toward the front end in the vehicle width direction, while the rear wall portion 48c is inward in the vehicle width direction. It is inclined forward as it goes from the base end to the front end in the vehicle width direction.

  The rear vertical wall 512 of the first protruding portion 51 extends from the vehicle width direction inner side to the vehicle width direction outer side so as to be parallel to the inclined front wall portion 48b of the first side coupling portion 481. It is configured to incline backward as it goes and the rear surface thereof faces the front surface of the front wall portion 48b in parallel.

  Further, the front vertical wall 511 of the first projecting portion 51 is inclined obliquely downward toward the rear as shown in FIG. Then, the vehicle width direction both ends (around the rear coupling portion 16b) of the suspension cross member 16 described above overlap with each other in the vehicle width direction and the vertical direction with respect to the first projecting portion 51. (See FIGS. 4 and 5).

  The second projecting portion 52 is disposed on the rear side of the first side coupling portion 481 and is provided so as to project downward from the lower surface of the coupling portion between the front floor frame 7 and the front side frame 8. Yes. In this embodiment, the second projecting portion 52 has a front vertical wall 521 disposed adjacent to the first side coupling portion 481 and a rear disposed on the rear side, similarly to the first projecting portion 51. The vertical wall 522, the vertical walls 523 and 524 on the left and right sides in the vehicle width direction disposed between the front vertical wall 521 and the rear vertical wall 522, and the bottom wall 525 that connects the lower end edges of these vertical walls to each other It is configured as a generally rectangular box as a whole. The second projecting portion 52 is also fixed to the front floor frame 7 (front side frame 8), for example, by welding or bolt coupling. Further, the second projecting portion 52 is also arranged so that a part on the inner side in the vehicle width direction is opposed to the first side coupling portion 481 in the front-rear direction, and the outer side in the vehicle width direction is The first side coupling portion 481 is formed so as to protrude outward from the outer end. In addition, the second projecting portion 52 is provided so as to protrude downward from the first side coupling portion 481 and also protrudes below the lower ends of the battery unit 21 and the battery module 221 (and the battery module 222). (See FIGS. 5 and 6).

  Then, the front vertical wall 521 of the second protrusion 52 is parallel to the inclined rear wall 48c of the first side coupling portion 481 described above from the vehicle width direction inner side to the vehicle width. Inclined forward as it goes outward in the direction, and its front surface is configured to face the rear surface of the rear wall portion 48c in parallel.

  Here, the abutting portion 48a of the first side coupling portion 481 is formed with a bolt hole 48d through which the bolt 482 is inserted. As shown in FIG. 4, the bolt hole 48d is formed in the shape of a long hole extending in the front-rear direction. The size of the bolt hole 48d is determined by the distance L1 between the shaft portion of the bolt 482 and the rear end edge of the bolt hole 48d. Longer than the distance L2 between the front wall portion 48b of the first side coupling portion 481 and the rear vertical wall 512 of the first projecting portion 51 (L1> L2), and the front edge of the shaft portion of the bolt 482 and the bolt hole 48d. Is set to be longer than the distance L4 between the rear wall portion 48c of the first side coupling portion 481 and the front vertical wall 521 of the second projecting portion 52 (L3> L4). Here, L1 = L3 may be set, or L1 ≠ L3 may be set. Similarly, L2 = L4 or L2 ≠ L4. In addition, although illustration is abbreviate | omitted, also in the side coupling parts 48 other than the 1st side coupling part 481, the bolt hole is formed in the shape of a long hole.

  The first projecting portion 51 and the second projecting portion 52 having such a configuration prevent the bolt coupling portion of each side coupling portion 48 from being damaged at the time of front collision and rear collision of the vehicle, respectively. This contributes to the improvement of the front collision performance and the rear collision performance related to the combination of 21. That is, since the battery unit 21 including a large number of battery modules 221 and 222 is heavy, the battery unit 21 is caused by a relatively large inertia force when the vehicle, for example, in a front collision, and the front floor frame 7, the front side frame 8 and An attempt is made to move forward relative to the vehicle body member such as the torque box 15.

  At this time, since the first projecting portion 51 is provided on the front side of the first side coupling portion 481, the front wall portion 48b of the first side coupling portion 481 that moves relative to the battery unit 21 is not It comes into contact with the rear vertical wall 512 of the installation portion 51. As a result, the first projecting portion 51 bears a load, and the battery unit 21 is prevented or suppressed from moving forward further.

  In particular, the front wall portion 48b of the first side coupling portion 481 and the first projection so that the front end edge of the first side coupling portion 481 and the rear end edge of the first projecting portion 51 are parallel to each other. Since the rear vertical wall 512 of the installation portion 51 is formed, and the front surface of the front wall portion 48b and the rear surface of the rear vertical wall 512 face each other in parallel, they come into contact with each other. When the first side coupling portion 481 and the first protruding portion 51 come into contact with each other, the load is effectively dispersed, and the first protruding portion 51 can reliably receive the load. As a result, the relative movement of the battery unit 21 can be more reliably avoided or suppressed.

  On the other hand, the bolt hole 48d provided in the first side coupling portion 481 is formed in a long hole shape in the front-rear direction, and as described above, the shaft portion of the bolt 482 and the rear end edge of the bolt hole 48d Is set to be longer than the distance L2 between the front wall portion 48b of the first side coupling portion 481 and the rear vertical wall 512 of the first projecting portion 51 (L1> L2). Thus, when the first side coupling portion 481 and the first projecting portion 51 are in contact with each other and the relative movement of the battery unit 21 is avoided or suppressed, the shaft portion of the bolt 482 and the bolt hole 48d Since the rear end edges do not contact each other, it is possible to avoid a shearing force from acting on the bolt coupling portion. As a result, there is no need to take measures such as forming bolts or bolt holes with a high-strength material or increasing the number of side coupling parts, and the bolts associated with the relative movement of the battery unit 21 during the frontal collision of the vehicle. It becomes possible to avoid breakage of the joint.

  On the contrary, at the time of rear collision of the vehicle, the battery unit 21 tries to move rearward relative to the vehicle body member, but the second projecting portion 52 is provided on the rear side of the first side coupling portion 481. Accordingly, the rear wall portion 48c of the first side coupling portion 481 comes into contact with the front vertical wall 521 of the second projecting portion 52 as the battery unit 21 moves relative to the rear. Also at this time, since the parallel surfaces of the rear surface of the rear wall portion 48c of the first side coupling portion 481 and the front surface of the front vertical wall 521 of the second projecting portion 52 are in contact with each other, The relative movement of the battery unit 21 further rearward is reliably avoided or suppressed.

  On the other hand, in the bolt hole 48d provided in the first side coupling portion 481, the distance L3 between the shaft portion of the bolt 482 and the front end edge of the bolt hole 48d is set to be equal to the rear wall portion 48c of the first side coupling portion 481 and the first side coupling portion 481. By setting the distance L4 longer than the front vertical wall 521 of the two protruding portions 52 (L3> L4), the first side coupling portion 481 and the second protruding portion 52 are in contact with each other, In a state where the relative movement of the battery unit 21 is avoided or suppressed, the shaft portion of the bolt 482 and the front end edge of the bolt hole 48d do not come into contact with each other, and it is avoided that a shearing force acts on the bolt coupling portion. The As a result, it is possible to avoid the bolt coupling portion from being damaged due to the relative movement of the battery unit 21 even at the rear collision of the vehicle.

  Since the front collision performance and rear collision performance related to the coupling of the battery units 21 are realized simply by providing the first and second projecting portions 51 and 52, the vehicle weight is significantly increased and the cost is reduced. Increase and decrease in productivity can be avoided.

  Further, since the first and second projecting portions 51 and 52 are provided in the vicinity of a vehicle body member having a relatively high rigidity, such as a coupling portion of the front floor frame 7 and the front side frame 8 and the torque box 15. It becomes possible to more reliably receive the load accompanying the relative movement of the battery unit 21 described above, and to avoid or suppress the relative movement of the battery unit 21 more reliably. This is extremely advantageous in avoiding breakage of the bolt joint.

  As shown in FIGS. 5 and 6, the first and second projecting portions 51 and 52 are provided so as to protrude downward from the first side coupling portion 481, and more accurately, the battery unit 21. Is provided so as to protrude downward from the lower surface of the plate. For this reason, it is possible to avoid or prevent the first and second projecting portions 51 and 52 from causing the first side coupling portion 481 to interfere with the road surface and also causing the battery unit 21 to interfere with the road surface. is there. Furthermore, as these 1st and 2nd protrusion parts 51 and 52 are endlessly formed in the vehicle width direction rather than the 1st side coupling part 481, as shown in FIG. For example, it is possible to avoid or prevent road surface interference of the first side coupling portion 481 when the vehicle body is tilted in the roll direction, such as during wheel removal.

  Further, by disposing the first projecting portion 51 on the front side of the first side coupling portion 481, while disposing the second projecting portion 52 on the rear side of the first side coupling portion 481, for example, Even when the first projecting portion 51 cannot avoid road surface interference (when it is swung), the second projecting portion 52 can avoid or prevent road surface interference of the battery unit 21.

  Further, at the time of a frontal collision of the vehicle, a collision load is input to the power unit 71 and the power unit 71 moves backward. Since the suspension cross member 16 is disposed behind the power unit 71, a load is transmitted to the suspension cross member 16 as the power unit 71 moves backward, and the suspension cross member 16 also moves backward together with the power unit 71. . Thus, although the battery unit 21 is disposed behind the suspension cross member 16, the ends of the suspension cross member 16 on both sides in the vehicle width direction are opposed to the front vertical wall 511 of the first projecting portion 51. Since the front end of the battery unit 21 is positioned rearward of the front end of the first projecting portion 51, the battery unit 21 is disposed when the suspension cross member 16 is retracted. Prior to hitting 21, both end portions in the vehicle width direction come into contact with the front vertical wall 511 of the first projecting portion 51.

  Since the front vertical wall 511 of the first projecting portion 51 is inclined obliquely downward toward the rear, the left and right side end portions of the suspension cross member 16 in contact with the front vertical wall 511 are By being guided along the inclined surface, the suspension cross member 16 moves rearward and downward. As a result, interference with the battery unit 21 disposed at substantially the same height with respect to the suspension cross member 16 is avoided, and the battery unit 21 can be protected during a front collision.

  In particular, as shown by a two-dot chain line in FIG. 5, the position of the front end of the battery module 221 or the electrical component 25 in the battery unit 21 is set to be behind the front end position of the first projecting portion 51. Therefore, the retracted suspension cross member 16 is reliably avoided from coming into contact with the battery module 221 and the electrical component 25. This is extremely advantageous in protecting the battery module 221 and the electrical component 25. For example, the front portion 41a of the frame member 40 in the battery unit 21 may be disposed at the same position as the front end position of the first projecting portion 51 or at the front side thereof. Even in such a case, since the rear end edge of the suspension cross member 16 is curved, both ends of the suspension cross member 16 in the vehicle width direction are respectively connected to the front vertical wall 511 of the first projecting portion 51. Since the suspension cross member 16 moves rearward and downward, it is possible to avoid the central portion of the suspension cross member 16 in the vehicle width direction from contacting the battery unit 21 as much as possible. It is.

  In the above-described configuration, the side coupling portion 48 is coupled to the front floor frame 7. However, the vehicle body member to which the side coupling portion 48 is coupled is not limited to the front floor frame 7. The panel 1 may be sufficient and the side sill 12 may be sufficient like the left and right both ends 49 of the rear part 41b of the frame member 40. And each side coupling part 48 should just be couple | bonded with the vicinity of the floor cross member in a vehicle body member, or the vicinity of the torque box 15 in a vehicle body member. In that case, what is necessary is just to provide the 1st protrusion part 51 and the 2nd protrusion part 52 in the compartment floor panel 1, the side sill 12, etc. so that it may respond | correspond to the position of the side coupling part 48.

  Further, the number of the first projecting portions 51 and the second projecting portions 52 to be attached is not particularly limited, and two or more of each may be provided. Moreover, there is no restriction | limiting in particular also from the viewpoint of the damage prevention of the bolt coupling part at the time of a vehicle collision about the side coupling part 48 used as the attachment object of the 1st protrusion part 51 and the 2nd protrusion part 52. FIG.

  The present invention is useful for a lower body structure of an electric vehicle such as an electric vehicle in which a battery unit is mounted on the lower side of a passenger compartment floor.

1 Car floor panel (car floor)
15 Torque box 16 Suspension cross member 21 Battery unit 221 Battery module 222 Battery module 25 Electrical component 40 Frame member (support member)
48 Side coupling portion 481 First side coupling portion 48a Abutting portion 48b Front wall portion 48c Rear wall portion 48d Bolt hole 482 Bolt 51 First projecting portion 52 Second projecting portion 60 Frame member (support member)
7 Front floor frame (body parts)
71 Motor unit

Claims (10)

A lower body structure of a vehicle in which a battery unit having a battery module, an electrical component, and a support member that supports the battery module and the electrical component is mounted below the passenger compartment floor,
Each of the end portions on both sides in the vehicle width direction of the battery unit is provided with at least one side coupling portion coupled to the lower surface of the vehicle body member,
The side coupling portion is formed with a bolt hole for coupling the battery unit to the vehicle body member by a bolt,
A first protrusion is disposed on the lower surface of the vehicle body member so that at least a part thereof is opposed to the lateral coupling portion in the longitudinal direction of the vehicle body at a front position in the longitudinal direction of the vehicle body relative to the lateral coupling portion. Part is provided to protrude downward,
The bolt hole is such that the distance between the shaft portion of the bolt and the rear end edge of the bolt hole is wider than the distance between the front end of the side coupling portion and the rear end of the first projecting portion. A lower body structure of a vehicle that is formed in a long hole shape in the longitudinal direction of the body. In the lower body structure of the vehicle according to claim 1,
The first projecting portion is a lower vehicle body structure of a vehicle that projects outward from an outer end in a vehicle width direction of the side coupling portion. In the lower vehicle body structure of the vehicle according to claim 1 or 2,
A lower body structure of a vehicle in which a front end edge of the side coupling portion and a rear end edge of the first projecting portion, which are opposed to each other in the vehicle longitudinal direction, are formed to be parallel to each other. The lower body structure of the vehicle according to any one of claims 1 to 3,
The side coupling portion includes a contact portion that is in contact with the lower surface of the vehicle body member, the bolt hole is formed, and a front wall portion that stands downward from a front end of the contact portion.
The lower body structure of the vehicle in which the front wall portion is opposed to the rear end surface of the first projecting portion so as to be parallel to each other. The lower body structure of the vehicle according to any one of claims 1 to 3,
A second protrusion is disposed on the lower surface of the vehicle body member so that at least a part thereof is opposed to the lateral coupling portion in the longitudinal direction of the vehicle body at a rear position in the longitudinal direction of the vehicle with respect to the lateral coupling portion. The installation part is provided so as to protrude downward,
The bolt hole is configured so that a distance between a shaft portion of the bolt and a front end edge of the bolt hole is larger than a distance between a rear end of the side coupling portion and a front end of the second projecting portion. A lower body structure of a vehicle that is formed in a long hole shape in the front-rear direction. In the lower vehicle body structure of the vehicle according to claim 5,
A lower vehicle body structure of a vehicle in which a rear end edge of the side coupling portion and a front end edge of the second projecting portion, which are opposed to the longitudinal direction of the vehicle body, are formed to be parallel to each other. In the lower body structure of the vehicle according to claim 5 or 6,
The side coupling portion includes a contact portion that is in contact with the lower surface of the vehicle body member, the bolt hole is formed, and a rear wall portion that stands downward from a rear end of the contact portion.
The lower body structure of the vehicle, wherein the rear wall portion is opposed to the front end surface of the second projecting portion so as to be parallel to each other. In the lower body structure of the vehicle according to any one of claims 5 to 7,
Each of the first projecting portion and the second projecting portion is a lower vehicle body structure of a vehicle that projects below the lower end of the battery unit. The lower body structure of a vehicle according to any one of claims 5 to 8,
The vehicle body member includes at least a member extending in the vehicle longitudinal direction at an outer position in the vehicle width direction, and a torque box,
The vehicle body lower body structure in which the side coupling portion and the first and second projecting portions are both disposed in the vicinity of a member extending in the longitudinal direction of the vehicle body and in the vicinity of the torque box. In the lower body structure of the vehicle according to any one of claims 1 to 9,
A power unit and a suspension cross member are disposed at a front position in the vehicle longitudinal direction relative to the battery unit, and the power unit, the suspension cross member, and the battery unit are arranged in this order in the vehicle longitudinal direction and in the vehicle longitudinal direction. Arranged to face
A part of the suspension cross member on both sides in the vehicle width direction is arranged so as to overlap each other in the vehicle width direction and the vertical direction with respect to the first projecting portion,
The front end surface of the first projecting portion is inclined obliquely downward toward the rear,
The lower body structure of the vehicle, wherein a front end position of the battery module and the electronic component in the battery unit is set to a rear side in a vehicle longitudinal direction with respect to a front end of the first projecting portion.

Images