Vehicle body understructure

Abstract

To provide a compact vehicle body understructure that is easy to manufacture and capable of firmly connecting an impact absorption member and a target object.SOLUTION: A vehicle body understructure includes: an impact absorption member 15; a cylindrical member 17 fixed in a crimped state to an inner surface of a hole part 15P of the impact absorption member 15; and a bolt 18 inserted into an inner space 17s of the cylindrical member 17. The cylindrical member 17 has an abutting surface formed at an outer end part 17y projecting outwardly from the hole part 15P of the impact absorption member 15, with an increased diameter area 17x having a larger diameter than the outer end part 17y formed on the inside of the impact absorption member 15. The abutting surface of the cylindrical member 17 and a target object 12 are connected in contact with each other by the bolt 18 inserted into the internal space 17s of the cylindrical member 17 and a bolt insertion hole 12a of the target object.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a vehicle body lower structure.

Background Art

[0002] The vehicle shown in Patent Document 1 arranges a power source such as a battery below the cabin floor in order to supply power to a driving motor or the like. Further, this vehicle is provided with a shock absorbing member (EA member in the document) that absorbs shock energy below the rocker in order to protect the occupants in the cabin from shocks acting from the side and suppress damage to the power source.

[0003] The vehicle shown in Patent Document 1 is fixed to the rocker by bolts that penetrate the shock absorbing member in the vertical direction. Further, the vehicle shown in Patent Document 1 arranges a support plate across the bottom surface of the battery and the bottom surface of the shock absorbing member, and supports the battery by fixing this support plate to the EA member with bolts.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The shock absorbing member shown in Patent Document 1 has an upper plate and a lower plate, and forms a plurality of spaces therebetween. A collar that penetrates the upper plate in the vertical direction and extends upward is welded and fixed to the upper plate, and the shock absorbing member is connected to the rocker by a bolt (bolt 31 in the document) that is inserted vertically into the internal space of this collar. This connection is made by screwing a nut onto the upper end of the bolt with the upper end of the collar in contact with the lower surface of the rocker, and clamping the lower wall of the rocker between the nut and the contact surface of the upper end of the collar.

[0006] In Patent Document 1, the color penetrates above and below the shock absorption member, and a bolt (bolt 33 in the document) is provided on the vehicle body inner side of a bolt (bolt 31 in the document) inserted vertically into the internal space of this color. A configuration is shown in which a support plate is fixed to the lower surface of the shock absorption member by these bolts.

[0007] In order to connect the shock absorption member to the rocker, for example, as described in Patent Document 1, a configuration in which a color is passed through the shock absorption member and the color is fixed to the upper plate of the shock absorption member by welding forms a gap between the upper surface of the shock absorption member and the lower surface of the rocker. However, when welding the color to the shock absorption member, the heat during welding distorts the shock absorption member and the color, making it difficult to manage accuracy, and also requires equipment and dedicated jigs necessary for the welding process, resulting in an increase in manufacturing cost. Considering the environmental impact due to the generation of CO2, there is room for improvement. In particular, in the configuration where the color is welded to the upper plate of the shock absorption member, since the welding bead is formed in a protruding form on the outer periphery of the color, for example, there is a limit to securing the distance for bringing the upper plate of the shock absorption member and the bottom surface of the rocker close to each other.

[0008] For these reasons, a vehicle body lower structure that is easy to manufacture, can firmly connect the shock absorption member and the connection target, and is compact is desired.

Means for Solving the Problem

[0009] The characteristic configuration of the connection mechanism according to the present invention includes a shock absorption member that absorbs an impact caused by a collision, a cylindrical member fixed in a pressure-bonded state to the inner surface of a hole formed in the shock absorption member, and a bolt inserted into the internal space of the cylindrical member. The cylindrical member is formed with a contact surface that contacts a connection target at an outer end portion protruding outward from the hole of the shock absorption member. An enlarged diameter region having a larger diameter than the outer end portion is formed inside the shock absorption member. In a state where the contact surface of the cylindrical member and the connection target are in contact, they are connected by the bolt inserted into the internal space of the cylindrical member and the bolt insertion hole of the connection target.

[0010] In the shock-absorbing member of this characteristic configuration, a diameter-expanded region of a cylindrical member is formed inside, and the outer surface of the cylindrical member is pressure-bonded to the inner surface of the hole portion of the shock-absorbing member, thereby being integrated with the cylindrical member. Therefore, a welding process for fixing the cylindrical member to the shock-absorbing member becomes unnecessary. Further, the cylindrical member abuts the contact surface of the outer end portion protruding outward from the hole portion of the shock-absorbing member against the connection target, inserts a bolt inserted through the internal space of the cylindrical member into the bolt insertion hole of the connection target, and realizes the connection between the shock-absorbing member and the connection target by the bolt. Accordingly, a vehicle body lower structure that is easy to manufacture and firmly connects the shock-absorbing member and the connection target is obtained. Further, since welding is unnecessary, generation of welding beads is eliminated, compactness is achieved, distortion due to heat during welding is eliminated, and high-precision management is possible. Furthermore, the influence on the environment due to the generation of CO2 can also be reduced.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0012] Hereinafter, an embodiment of the vehicle body lower structure according to the present invention will be described with reference to the drawings. In the present embodiment, as an example of the vehicle body lower structure, a configuration in which an impact absorbing member 15 and a connection target are connected using bolts 18 will be described. However, without being limited to the following embodiments, the configuration of the connection mechanism C, the arrangement of the connection mechanism C, and the connection target can be variously modified within a range not departing from the gist thereof.

[0013] 〔Basic Configuration〕 As shown in FIGS. 1 and 2, a vehicle A capable of traveling by electric power is configured by providing a vehicle body frame F made of steel material with left and right front wheels 1 and left and right rear wheels 2, a battery unit B at the center of the vehicle body frame F, and a drive unit 3 for driving the rear wheels 2 at the rear of the vehicle body frame F.

[0014] The vehicle A is configured as a hybrid vehicle (HEV: Hybrid Electric Vehicle), a plug-in hybrid vehicle (PHEV: Plug-in Hybrid Electric Vehicle), a battery vehicle (BEV: Battery Electric Vehicle), a fuel cell vehicle (FCEV: Fuel Cell Electric Vehicle), or the like. Although the specific structure is not shown in the drawings, the drive unit 3 includes an electric motor, an inverter that controls the current supplied from the battery unit B and supplies it to the electric motor, a reduction gear that transmits the driving force of the electric motor to the left and right rear wheels 2, and a housing that houses these.

[0015] The battery unit B has a plurality of battery cells (not shown) configured as rechargeable secondary batteries and is housed in a battery case 6.

[0016] As shown in FIGS. 1 and 2, the vehicle body frame F has a structure in which left and right front side members 11 arranged left and right in the vehicle width direction and extending in the vehicle front-rear direction, left and right rocker frames 12, and left and right rear side members 13 are arranged in this order.

[0017] The vehicle body frame F of the present embodiment creates a space between a plurality of press-worked steel plates by joining them using techniques such as spot welding, and causes the region where the space is formed to function as a strength member.

[0018] The vehicle body frame F may also be configured by a combination of pipe-shaped steel materials. Further, the shape of the vehicle body frame F is not limited to that shown in FIG. 1, and may be any shape or structure, such as bending the side member to correspond to the structure of the drive system.

[0019] As shown in FIG. 3, in this vehicle A, in a plan view, shock absorbing members 15 are provided below the left and right rocker frames 12 at positions overlapping the rocker frames 12. The shock absorbing members 15 are entirely formed of an aluminum material, and a plurality of member spaces 15a extending in the vehicle front-rear direction are formed.

[0020] The shock absorbing members 15 function to absorb shock by deforming, for example, when contacting another vehicle or a guard rail, etc., and to mitigate the shock acting on the occupants and the vehicle body equipment.

[0021] As shown in FIGS. 1 and 2, the rocker frames 12 are arranged in the middle of the left and right rocker frames 12, below the floor panel 5 that becomes the underfloor of the cabin of the vehicle A, and above the shared panel 8.

[0022] 〔Vehicle body lower structure〕 As shown in FIG. 1, in a plan view, in the middle of the left and right rocker frames 12, and in a side view shown in FIG. 2, a battery unit B is arranged at positions overlapping the rocker frames 12 and the shock absorbing members 15 respectively.

[0023] As shown in FIG. 3, the shock absorbing members 15 are connected and fixed to the lower side of the rocker frames 12 via a plurality of connection mechanisms C. Further, a bracket 7 that supports the battery unit B and the shared panel 8 are connected to the shock absorbing members 15 by a plurality of connection mechanisms C adjacent to the inside in the vehicle width direction.

[0024] The shock-absorbing member 15 is connected and fixed to the rocker frame 12. In the posture shown in the figure, the upper side is referred to as the upper wall 15T, and the lower side is referred to as the lower wall 15B. Also, the thickness of the shock-absorbing member 15 in the vertical direction is referred to as the member thickness T.

[0025] As shown in FIGS. 3 to 6, the connecting mechanism C includes a cylindrical member 17 that expands in diameter while being inserted into a main hole portion 15P (an example of a hole portion) formed in the upper wall 15T or the lower wall 15B of the shock-absorbing member 15, and is maintained in a state where the outer surface is crimped to the inner surface of the main hole portion 15P, a bolt 18 inserted into the internal space 17s of the cylindrical member 17, and a nut 19 screwed onto the male screw portion of the bolt 18.

[0026] The cylindrical member 17 realizes connection in a form in which the connection target is brought into contact with the contact surface 17a of the outer end portion 17y protruding from the shock-absorbing member 15 to the outside. Note that the bolt 18 and the nut 19 are made of iron material. Note that, instead of using the nut 19, for example, a female screw portion may be formed on the rocker frame 12, and the bolt 18 may be screwed and fastened thereto.

[0027] In this vehicle body lower structure, the connecting mechanism C for connecting and fixing the shock-absorbing member 15 to the lower side of the rocker frame 12 and the connecting mechanism C for connecting and fixing the bracket 7 and the shared panel 8 to the shock-absorbing member 15 basically have a common configuration.

[0028] The cylindrical member 17 is made of a cylindrical aluminum material. The connecting mechanism C expands the diameter of the cylindrical member 17 by the technique of "installation processing", and crimps the outer surface of the cylindrical member 17 to the inner surface of the main hole portion 15P, thereby realizing the integration of the shock-absorbing member 15 and the plurality of cylindrical members 17 as shown in FIGS. 7 and 8.

[0029] 〔Vehicle body lower structure: Installation processing〕 Fig. 9 shows an overview of the "installation process". In the "installation process", a main hole 15P penetrating vertically is formed in one of the upper wall 15T and the lower wall 15B of the shock-absorbing member 15, and a sub-hole 15Q coaxial with the central axis X of the main hole 15P is formed in the other of the upper wall 15T and the lower wall 15B. Note that Fig. 9 shows a configuration in which the main hole 15P is formed in the upper wall 15T and the sub-hole 15Q is formed in the lower wall 15B. In the following description, the "installation process" will be explained corresponding to this configuration.

[0030] The outer diameter of the cylindrical member 17 is slightly smaller than the inner diameter of the main hole 15P. Also, the outer diameter of the pin portion 21a of the press jig 21 is slightly smaller than the inner diameter of the cylindrical member 17. The length of the cylindrical member 17 (the length in the direction along the central axis X) is such that one end abuts against the wall portion of the shock-absorbing member 15 (the lower wall 15B in Fig. 9) and the other end protrudes from the shock-absorbing member 15.

[0031] As shown in Fig. 9, in the "installation process", the cylindrical member 17 is inserted into the shock-absorbing member 15 from the main hole 15P, and the press jig 21 is arranged on the protruding side of the cylindrical member 17. Also, in the "installation process", an annular pressure-receiving body 22 is arranged at a position where it abuts against the lower wall 15B of the shock-absorbing member 15 on the side opposite to the press jig 21 in the direction along the central axis X, and the cylindrical pin portion 21a of the press jig 21 is inserted through the internal space 17s of the cylindrical member 17, the sub-hole 15Q, and the central through-hole of the pressure-receiving body 22.

[0032] In the "installation process", in this set state, the press jig 21 is operated by a set amount in the direction of sandwiching the cylindrical member 17 between the press jig 21 and the pressure-receiving body 22. Along with this operation, a large pressure acts on the cylindrical member 17, and the internal region of the shock-absorbing member 15 in the cylindrical member 17 plastically deforms so as to bulge in a drum shape, and the cylindrical member 17 expands in diameter. Due to this expansion in diameter, the outer surface of the cylindrical member 17 is maintained in a state of being pressure-bonded to the inner circumference of the main hole 15P. Note that in Fig. 9, the direction in which the cylindrical member 17 bulges is indicated by a hollow arrow, and the bulging form is drawn exaggeratedly.

[0033] In this way, within the shock-absorbing member 15, as the cylindrical member 17 expands, the region with a diameter larger than the outer end portion 17y is referred to as the expanded-diameter region 17x. Due to this expansion in diameter, the outer periphery of the cylindrical member 17 is crimped to the inner surface of the main hole portion 15P (hole portion) of the shock-absorbing member 15, and the shock-absorbing member 15 and the cylindrical member 17 are integrated.

[0034] Figures 7 and 8 show a plurality of cylindrical members 17 integrated with the shock-absorbing member 15 by "installation processing", and a plurality of connecting mechanisms C are constituted by these plurality of cylindrical members 17. Also, as shown in Figures 3 and 5, the connecting mechanism C connects the shock-absorbing member 15 to the rocker frame 12 as a connection target, and connects the shock-absorbing member 15 to the bracket 7 and the shared panel 8 as connection targets.

[0035] 〔Lower Body Structure: Connection with Rocker Frame〕 As shown in Figures 3 and 4, the connecting mechanism C that connects the shock-absorbing member 15 to the rocker frame 12 projects the outer end portion 17y of the cylindrical member 17 upward from the upper wall 15T of the shock-absorbing member 15 by a predetermined protruding amount E1. The nut 19 is welded and fixed to the rocker frame 12 coaxially with the connection hole 12a (an example of a bolt insertion hole) inside the rocker frame 12.

[0036] The connecting mechanism C inserts the bolt 18 from the sub-hole portion 15Q of the lower wall 15B of the shock-absorbing member 15 into the internal space 17s of the cylindrical member 17, inserts the bolt 18 into the connection hole 12a (an example of a bolt insertion hole) of the rocker frame 12, and performs fastening in a form where the male screw portion of the bolt 18 is screwed into the nut 19. Note that the cylindrical member 17 shown in Figure 4 is illustrated disassembled for convenience, but in reality, it is "installed" on the shock-absorbing member 15 as shown in Figure 9.

[0037] The connecting mechanism C reaches a state in which the bolt head 18a (the head of the bolt) abuts against the lower wall 15B of the shock-absorbing member 15 and the upper end of the cylindrical member 17 abuts against the bottom surface of the rocker frame 12 by rotating the bolt 18 in the screwed state. In the fastened state, the upper surface of the upper wall 15T of the shock-absorbing member 15 is disposed at a position spaced apart from the lower surface of the rocker frame 12 by a distance equal to the protruding amount E1 upward from the upper wall 15T of the cylindrical member 17.

[0038] As described above, a plurality of connecting mechanisms C for connecting to the rocker frame 12 are provided on the shock-absorbing member 15, and the operation of screwing the female screw portion of the bolt 18 into the nut 19 is performed in each of the plurality of connecting mechanisms C.

[0039] 〔Lower Body Structure: Connection with Brackets, etc.〕 FIGS. 5 and 6 show a connection form for connecting the shock-absorbing member 15 to a bracket 7 (an example of a connection target) made of a steel plate connected to the battery case 6 of the battery unit B and a shared panel 8 (an example of a connection target) made of a steel plate.

[0040] The connecting mechanism C for connecting the bracket 7 and the shared panel 8 to the shock-absorbing member 15 projects the outer end portion 17y of the cylindrical member 17 downward from the lower wall 15B of the shock-absorbing member 15 by a predetermined protruding amount E2. This protruding amount E2 is smaller than the protruding amount E1 of the cylindrical member 17 of the connecting mechanism C that connects the shock-absorbing member 15 to the rocker frame 12.

[0041] The battery unit B is housed inside the battery case 6, and the base end of the bracket 7 is fixed to the bottom surface of the battery case 6. The bracket 7 has a middle portion bent in a stepped shape, and a nut 19 is fixed by welding above a bracket hole 7a (an example of a bolt insertion hole) formed at an extending end extending outward in the vehicle width direction in plan view.

[0042] The shared panel 8 is disposed in a region covering the lower part of the battery case 6, and a plurality of panel holes 8a (an example of bolt insertion holes) are formed outward in the vehicle width direction in plan view.

[0043] As shown in FIGS. 5 and 6, the connecting mechanism C abuts the bracket 7 against the upper surface of the upper wall 15T of the shock absorbing member 15, and abuts the upper surface of the shared panel 8 against the lower contact surface 17a at the protruding end of the cylindrical member 17.

[0044] This connecting mechanism C inserts the bolt 18 through the panel hole 8a, inserts this bolt 18 from the lower end to the upper end through the internal space 17s of the cylindrical member 17, further inserts through the sub-hole portion 15Q and the bracket hole 7a, and fastens the male screw portion to the nut 19. As a result, the shared panel 8 is disposed at a position spaced downward from the lower wall 15B of the shock absorbing member 15 by a distance equal to the protruding amount E of the cylindrical member 17. Note that the cylindrical member 17 shown in FIG. 6 is illustrated by being disassembled for convenience, but in actuality, it is "installed" on the shock absorbing member 15 as shown in FIG. 9.

[0045] This fastening is in a form in which the bracket 7 and the shared panel 8 are fastened together by a common bolt 18.

[0046] In particular, since the connecting mechanism C reduces the protruding amount E2 of the cylindrical member 17 downward, as shown in FIG. 5, the position of the bolt head 18a can be set higher than the bottom wall line H in the horizontal posture indicating the level of the lowermost surface 8b of the shared panel 8. Thereby, even if the unevenness of the road surface contacts the lowermost surface 8b of the shared panel 8 during traveling, the phenomenon that the unevenness of the road surface contacts the bolt head 18a can be suppressed, and breakage of the bolt 18 and displacement of the shock absorbing member 15 can be suppressed.

[0047] 〔Operational Effects of the Embodiment〕 The connecting mechanism C has a cylindrical member 17 protruding upward or downward from the shock absorbing member 15, and this cylindrical member 17 is fixed to the main hole portion 15P (hole portion) of the shock absorbing member 15 in a pressure-bonded state. Therefore, for example, a welding process for fixing the cylindrical member 17 to the shock absorbing member 15 is not required, and distortion due to the action of heat associated with the welding process is not caused.

[0048] Further, for example, in a configuration where the cylindrical member 17 is fixed to the shock-absorbing member 15 by welding, in order to obtain the strength required for the welded portion, a bead width of a predetermined width is required in the direction in which the cylindrical member 17 protrudes. In the case where a bead of a predetermined width is formed in this way, there is a limit in reducing the protruding amounts E1 and E2 of the cylindrical member 17 with respect to the shock-absorbing member 15.

[0049] On the other hand, the cylindrical member 17 is inserted into the main hole portion 15P (hole portion) formed in the shock-absorbing member 15, and the diameter of the cylindrical member 17 is expanded by the technique of "installation processing" and crimped to the inner surface of the main hole portion 15P. For this reason, it is also possible to make the protruding amounts E1 and E2 of the cylindrical member 17 with respect to the shock-absorbing member 15 extremely small, extremely reduce the protruding amounts E1 and E2 from the upper wall 15T or the lower wall 15B of the shock-absorbing member 15, realize shortening of the distance to the connection target, and achieve compactification.

[0050] Further, in order to arrange the bolts 18 to penetrate the shock-absorbing member 15 vertically, for example, as shown in FIG. 5, the bracket 7 is arranged on the outer surface side of the upper wall 15T of the shock-absorbing member 15, and the share panel 8 is arranged on the outer surface side of the lower wall 15B of the shock-absorbing member 15, and it is also possible to support a plurality of members by tightening them together.

[0051] 〔Alternative Embodiment〕 The present invention may be configured as follows in addition to the above-described embodiment (those having the same functions as the embodiment are given the same numbers and reference signs as the embodiment).

[0052] (a) The material of the cylindrical member 17 is not limited to an aluminum material, and it is possible to use materials such as iron, copper, and tin that are relatively easily plastically deformed. Further, the cylindrical member 17 is not limited to a cylinder, and the cross-sectional shape may be an ellipse or a polygon.

[0053] (b) The impact absorbing member 15 is not limited to the structure and quantity shown in the above-described embodiment as the plurality of member spaces 15a. For example, for a member space 15a having a rectangular cross-sectional shape, it may have a rib intersection portion in the diagonal direction, or a member space 15a having a polygonal cross-sectional shape.

[0054] (c) In the connecting mechanism C, the direction in which the bolt 18 is inserted may be opposite to that in the above-described embodiment, with the bolt head 18a arranged on the upper side and the nut 19 arranged on the lower side.

[0055] In addition, the configurations disclosed in the above-described embodiments (including other alternative embodiments, the same hereinafter) can be applied in combination with the configurations disclosed in other embodiments as long as there is no contradiction. Also, the embodiments disclosed in this specification are examples, and the embodiments of the present invention are not limited thereto, and can be appropriately modified within the scope not departing from the object of the present invention.

[0056] In the above-described embodiment, the following configurations are recalled. (1) A vehicle body lower structure including an impact absorbing member 15 that absorbs impact caused by a collision, a cylindrical member 17 fixed in a pressure-bonded state to the inner surface of a hole (main hole 15P) formed in the impact absorbing member 15, and a bolt 18 inserted through the internal space 17s of the cylindrical member 17. The cylindrical member 17 is formed with a contact surface 17a that contacts a connection target (rocker frame 12, shared panel 8) at an outer end portion 17y protruding outward from the hole (main hole 15P) of the impact absorbing member 15. An enlarged diameter region 17x having a larger diameter than the outer end portion 17y is formed inside the impact absorbing member 15. In a state where the contact surface 17a of the cylindrical member 17 and the connection target are in contact, they are connected by a bolt 18 inserted through the internal space 17s of the cylindrical member 17 and the bolt insertion holes (connection holes 12a, panel holes 8a) of the connection target (rocker frame 12, shared panel 8).

[0057] In this configuration, the shock-absorbing member 15 is integrated with the cylindrical member 17 by inserting the outer surface of the cylindrical member 17 into the hole (main hole 15P) of the shock-absorbing member 15 and crimping the outer surface of the cylindrical member 17 to the inner surface of the hole (main hole 15P). In this cylindrical member 17, a diameter-expanded region 17x where the inside of the shock-absorbing member 15 has a larger diameter than the outer end portion 17y protruding outward from the hole (main hole 15P) of the shock-absorbing member 15 is formed, so that the crimped state can be maintained. With this configuration, a welding process for fixing the cylindrical member 17 to the shock-absorbing member 15 becomes unnecessary, equipment for welding is unnecessary, there is no distortion due to heat during welding, and high-precision management is possible. Furthermore, the impact on the environment due to the generation of CO2 can also be reduced.

[0058] Also, the cylindrical member 17 is arranged in a positional relationship such that the contact surface 17a of the outer end portion 17y protruding outward from the hole (main hole 15P) of the shock-absorbing member 15 abuts against the connection targets (rocker frame 12, shared panel 8). By inserting a bolt 18 inserted through the internal space 17s of the cylindrical member 17 into the bolt insertion holes (connection holes 12a, panel holes 8a) of the connection targets (rocker frame 12, shared panel 8) and screwing the bolt 18, the shock-absorbing member 15 and the connection targets (rocker frame 12, shared panel 8) can be connected.

[0059] (2) In the vehicle body lower structure of (1), a battery case 6 is arranged adjacent to the shock-absorbing member 15 in the vehicle width direction, and a shared panel 8 that covers the lower part of the battery case 6 is arranged below the shock-absorbing member 15. It is preferable that the connection target is at least one of the bracket 7 of the battery case 6 or the shared panel 8.

[0060] According to this, by connecting the bracket 7 of the battery case 6 to the cylindrical member 17 integrated with the shock-absorbing member 15 or connecting the shared panel 8 to the cylindrical member 17, it becomes possible to support these with the shock-absorbing member 15.

[0061] (3) In the vehicle body lower structure of (2), when the connection target is the shared panel 8, it is preferable that the head of the bolt 18 (bolt head 18a) for connecting the shared panel 8 to the shock absorbing member 15 is located above the lowermost surface 8b of the shared panel 8.

[0062] According to this, for example, even when the road surface contacts the lower surface of the shared panel 8 during the running of the vehicle A, the phenomenon that the road surface contacts the head of the bolt 18 (bolt head 18a) is suppressed, and the breakage of the bolt 18 is suppressed.

[0063] (4) In the vehicle body lower structure of (2) or (3), when the connection targets are the bracket 7 and the shared panel 8, it is preferable that they are clamped together by a bolt 18 inserted through the internal space 17s of the cylindrical member 17, the bolt insertion hole (panel hole 8a) of the shared panel 8, and the bolt insertion hole (bracket hole 7a) of the bracket 7.

[0064] According to this, by clamping together with the bolt 18, it becomes possible to fasten the bracket 7 and the shared panel 8 to the shock absorbing member 15, and it becomes possible to reduce the number of bolts 18.

Industrial Applicability

[0065] The present invention can be used for the vehicle body lower structure of a vehicle.

Explanation of Reference Numerals

[0066] 6: Battery case, 7: Bracket (connection target), 7a: Bracket hole (bolt insertion hole), 8: Shared panel, 8a: Panel hole (bolt insertion hole), 8b: Lowermost surface, 12: Rocker frame (connection target), 12a: Connection hole (bolt insertion hole), 15: Shock absorbing member, 15P: Main hole part (hole part), 17: Cylindrical member, 17a: Contact surface, 17s: Internal space, 17x: Diameter-expanded region, 17y: Outer end part, 18: Bolt, 18a: Bolt head (head), C: Connection mechanism

Claims

1. A shock-absorbing member that absorbs impact due to a collision, a cylindrical member fixed in a pressure-bonded state to the inner surface of a hole formed in the shock-absorbing member, and a bolt inserted into the internal space of the cylindrical member, and comprising: The cylindrical member is formed with a contact surface that contacts a connection target at an outer end protruding outward from the hole of the shock-absorbing member, and a diameter-expanded region having a diameter larger than that of the outer end is formed inside the shock-absorbing member. A lower body structure in which, in a state where the contact surface of the cylindrical member and the connection target are in contact, the cylindrical member is connected by the bolt inserted into the internal space of the cylindrical member and the bolt insertion hole of the connection target.

2. A battery case is arranged adjacent to the shock-absorbing member in the vehicle width direction, a shared panel that covers the lower part of the battery case is arranged below the shock-absorbing member, The lower body structure according to claim 1, wherein the connection target is at least one of a bracket of the battery case or the shared panel.

3. The connection target is the shared panel, The lower body structure according to claim 2, wherein the head of the bolt that connects the shared panel to the shock-absorbing member is located above the lowermost surface of the shared panel.

4. The connection target is the bracket and the shared panel, The lower body structure according to claim 2 or 3, wherein the bolt inserted through the internal space of the cylindrical member, the bolt insertion hole of the shared panel, and the bolt insertion hole of the bracket is tightened together.

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