Vehicle underbody structure

Abstract

This mechanism prevents the load applied by the jack from being transferred to the battery frame during jacking up. [Solution] The lower body structure of the vehicle, which includes a battery housing 6 positioned below the floor panel 4 and a battery frame 20 that supports the battery housing 6 and is attached to the side sill 10, includes a jack attachment 30 positioned on the lower surface portion 23 of the battery frame 20 and a collar member 40 for attaching the jack attachment 30. The collar member 40 is inserted through the jack attachment 30 and the battery frame 20 and contacts the side sill 10, and is attached to the side sill 10 using fastening members B1 and N1, and a jack contact portion 47 is provided on the lower surface portion 45 of the collar member 40.

Description

Technical Field

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

Background Art

[0002] In a vehicle such as an electric vehicle including a motor as a drive source for driving the vehicle and a battery for storing electric power supplied to the motor, a large and heavy battery is generally disposed below a floor panel forming a floor surface of a passenger compartment and between a pair of left and right side sills coupled to both end portions in the vehicle width direction of the floor panel.

[0003] For example, Patent Document 1 discloses that in a vehicle in which a battery is disposed between a pair of left and right side sills below a floor panel, a frame of a battery case is fastened to a lower surface of a side sill, and the battery case and the battery are supported by a vehicle body.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a vehicle in which a battery housing for housing a battery is disposed below a floor panel and a battery frame for supporting the battery housing is attached to a side sill, when a jack attachment for attaching a jack is disposed on a lower surface of the battery frame, at the time of jacking up, a load input from the jack is input from the jack attachment to the battery frame, and there is a risk that the battery frame may be deformed to damage the battery housing.

[0006] The object of this disclosure is to provide a vehicle underbody structure that suppresses the input of load from a jack to the battery frame during jacking up. [Means for solving the problem]

[0007] This disclosure provides a lower body structure for a vehicle, comprising a floor panel, side sills connected to both ends of the floor panel in the vehicle width direction and extending in the longitudinal direction of the vehicle body, a battery housing disposed below the floor panel, and a battery frame supporting the battery housing and extending in the longitudinal direction of the vehicle body and attached to the side sill, wherein the lower body structure comprises a jack attachment disposed on the lower surface of the battery frame and a collar member formed in an annular shape for attaching the jack attachment, the collar member passing through the jack attachment and the battery frame and contacting the side sill and being attached to the side sill using a fastening member, and a jack contact portion for contacting a jack is provided on the lower surface of the collar member.

[0008] According to this disclosure, when a jack attachment is positioned on the lower surface of a battery frame attached to a side sill, a jack contact portion is provided on the lower surface of a collar member that passes through the jack attachment and the battery frame and contacts the side sill. Therefore, when jacking up, the load input from the jack can be transmitted from the jack contact portion through the collar member to the side sill, and the load input from the jack can be prevented from being input to the battery frame.

[0009] The jack contact portion may protrude downward from the peripheral edge of the insertion hole of the jack attachment through which the collar member is inserted.

[0010] With this configuration, when jacking up, it is possible to suppress the jack from coming into contact with the jack attachment and instead bring the jack into contact with the jack contact portion of the collar member, thereby transmitting the load input from the jack to the side sill.

[0011] The lower surface of the jack attachment is provided with a recess for a jack that is recessed upward to accommodate the jack, and the jack contact portion may protrude downward from the bottom surface of the recess for the jack.

[0012] With this configuration, the jack contact portion protrudes below the bottom surface of the jack recess provided on the lower surface of the jack attachment. By positioning the jack within the jack recess, it is possible to prevent the jack from coming off the jack contact portion, while simultaneously transmitting the load applied from the jack to the side sill during jacking up.

[0013] The battery frame has a closed cross-section extending in the longitudinal direction of the vehicle body, and through holes may be formed in the closed cross-section through which a collar member is inserted.

[0014] According to this configuration, even when the battery frame has a closed section extending in the longitudinal direction of the vehicle body, by forming an insertion hole in the closed section, the strength and rigidity of the battery frame can be increased by the closed section, while suppressing the input of load from the jack to the battery frame during jacking up. [Effects of the Invention]

[0015] According to the lower body structure of the vehicle disclosed herein, it is possible to suppress the input of the load from the jack to the battery frame when the vehicle is jacked up. [Brief explanation of the drawing]

[0016] [Figure 1] This is a plan view of the lower part of a vehicle body to which the lower vehicle body structure according to the present disclosure is applied. [Figure 2] This is a bottom view of the lower part of a vehicle body to which the lower body structure according to the present disclosure is applied. [Figure 3] This is a cross-sectional view of the lower part of the vehicle body along the Y3-Y3 line in Figure 2. [Figure 4]It is a perspective view of a jack attachment. [Figure 5] It is a cross-sectional view of the jack attachment along the Y5 - Y5 line in FIG. 4

Embodiments for Carrying out the Invention

[0017] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0018] FIG. 1 is a plan view of the lower part of a vehicle body to which the lower vehicle body structure according to an embodiment of the present disclosure is applied, and FIG. 2 is a bottom view of the lower part of a vehicle body to which the lower vehicle body structure according to an embodiment of the present disclosure is applied. As shown in FIGS. 1 and 2, a vehicle body 1 to which the lower vehicle body structure of a vehicle according to an embodiment of the present disclosure is applied is a vehicle body such as an electric vehicle including a motor 2 as a drive source for driving the vehicle and a battery 3 for storing electric power supplied to the motor 2 and the like.

[0019] The vehicle body 1 includes, at the lower part of the vehicle body, a flat floor panel 4 forming the floor surface of the passenger compartment, a pair of left and right closed cross-section side sills 10 each connected to both ends in the vehicle width direction of the floor panel 4 and extending in the vehicle front-rear direction, and a cross member 5 disposed between the pair of left and right side sills 10 on the upper surface of the floor panel 4 and extending in the vehicle width direction, specifically, a first cross member 5a and a second cross member 5b.

[0020] FIG. 3 is a cross-sectional view of the lower part of the vehicle body along the Y3 - Y3 line in FIG. 2. As shown in FIG. 3, each of the left and right side sills 10 includes a side sill inner 11 constituting the inner side of the vehicle body of the side sill 10 and a side sill outer 12 constituting the outer side of the vehicle body of the side sill 10. The side sill inner 11 and the side sill outer 12 are each formed by press-forming a metal plate-like member such as a steel plate into a substantially hat-shaped cross section.

[0021] The side sill inner 11 includes an upper surface portion 11a extending in a substantially horizontal direction, a lower surface portion 11b located below the upper surface portion 11a and extending in a substantially horizontal direction, and a side surface portion 11c extending in the vertical direction. The side surface portion 11c is formed to bulge inward of the vehicle body. The side sill inner 11 also includes an upper flange portion 11d extending upward from the upper surface portion 11a and a lower flange portion 11e extending downward from the lower surface portion 11b.

[0022] The side sill outer 12 includes an upper surface portion 12a extending in a substantially horizontal direction, a lower surface portion 12b located below the upper surface portion 12a and extending in a substantially horizontal direction, and a side surface portion 12c extending in the vertical direction. The side surface portion 12c is formed to bulge outward of the vehicle body. The side sill outer 12 also includes an upper flange portion 12d extending upward from the upper surface portion 12a and a lower flange portion 12e extending downward from the lower surface portion 12b.

[0023] The upper flange portion 11d of the side sill inner 11 and the upper flange portion 12d of the side sill outer 12 are joined, and the lower flange portion 11e of the side sill inner 11 and the lower flange portion 12e of the side sill outer 12 are joined. The side sill 10 is formed in a substantially rectangular closed cross-sectional shape by the side sill inner 11 and the side sill outer 12, and the closed cross-sectional portion 13 extends in the vehicle body front-rear direction.

[0024] Inside the side sill 10, a reinforcement 15 for reinforcing the side sill 10 is disposed. The reinforcement 15 is formed in a substantially rectangular closed cross-sectional shape. The reinforcement 15 extends in the vehicle body front-rear direction along the side sill 10 and is fixedly attached to the side sill inner 11. The reinforcement 15 is formed by extruding aluminum.

[0025] In the vehicle body 1, the battery 3 is located below the floor panel 4. The vehicle body 1 includes a battery housing 6 located below the floor panel 4 to house the battery 3, and a battery frame 20 that supports the battery housing 6 and is attached to the left and right side sills 10. The battery 3 is formed by unitizing multiple battery modules that store power supplied to the motor 2 and the like.

[0026] The battery housing 6 has an upper cover 7 that covers the top of the battery 3 and extends substantially horizontally, and a lower cover 8 that covers the bottom of the battery 3 and extends substantially horizontally, with the upper cover 7 being connected to the lower cover 8. The battery 3 is fixed to the battery housing 6. The battery housing 6 is formed, for example, by press-forming aluminum.

[0027] The battery frame 20 is positioned on the outside of the battery housing 6 in the vehicle width direction, extending in the longitudinal direction of the vehicle body, and is formed in a substantially L-shape in cross-section. The battery frame 20 is formed by extruding aluminum. The battery frame 20 extends in the longitudinal direction of the vehicle body and has a closed cross-section portion 21 that is formed in a closed cross-section shape.

[0028] The battery frame 20 is formed in a closed cross-section and has an upper surface portion 22, a lower surface portion 23 located below the upper surface portion 22 and extending substantially horizontally, an inner surface portion 24 connecting the inner ends of the upper surface portion 22 and the lower surface portion 23 in the vehicle width direction and extending vertically, and an outer surface portion 25 connecting the outer ends of the upper surface portion 22 and the lower surface portion 23 in the vehicle width direction and extending vertically.

[0029] The upper portion 22 of the battery frame 20 is positioned lower in the vehicle width direction than the inner portion of the upper portion 22 in the vehicle width direction. The upper portion 25 of the battery frame 20 is positioned inward in the vehicle width direction than the lower portion of the outer portion 25. The upper and outer corners of the battery frame 20 are recessed due to the outer portion of the upper portion 22 and the upper portion of the outer portion 25, and the battery frame 20 is positioned close to the side sill 10.

[0030] The battery frame 20 also has vertical ribs 26 that divide the interior of the battery frame 20 and extend downward from the upper part of the outer surface 25 to the lower surface 23, and horizontal ribs 27 that divide the interior of the battery frame 20 and extend inward in the vehicle width direction from the outer part of the upper surface 22 in the vehicle width direction to the inner surface 24. The vertical ribs 26 and horizontal ribs 27 are provided throughout the entire battery frame 20, and the closed cross section 21 is divided into three sections by the vertical ribs 26 and horizontal ribs 27. The battery frame 20 does not necessarily have to be provided with vertical ribs 26 and horizontal ribs 27, and it may have a cross-sectional shape other than the substantially L-shaped cross section.

[0031] The battery frame 20 is fixedly attached to the upper surface 22 by the outer end of the upper cover 7 in the vehicle width direction, and to the lower surface 23 by the outer end of the lower cover 8 in the vehicle width direction, and supports the battery housing 6. As shown in Figure 2, the battery frame 20 is fixedly attached to the lower surface 11b of the side sill 10, specifically the lower surface 11b of the side sill inner 11, using fastening members 16.

[0032] A jack attachment 30 for mounting a jack is positioned on the lower surface 23 of the battery frame 20. The jack attachment 30 is provided on the front and rear sides of the battery frame 20, which is located below the side sill 10. As shown in Figure 3, the vehicle body 1 is provided with a collar member 40 for attaching the jack attachment 30 to the vehicle body 1, and the collar member 40 is formed in an annular shape. Through holes 21a for inserting the collar member 40 are formed in the closed cross section 21 of the battery frame 20, and through holes 21a are formed in the upper surface 22 and the lower surface 23. The jack attachment 30 and the collar member 40 are formed using, for example, a metal material.

[0033] Figure 4 is a perspective view of the jack attachment, and Figure 5 is a cross-sectional view of the jack attachment along the Y5-Y5 line in Figure 4. Figures 4 and 5 also show the collar member and the fastening member for attaching the collar member to the side sill. As shown in Figure 4, the jack attachment 30 is formed in a substantially rectangular parallelepiped shape, with its front-to-rear dimension being longer than its width-to-vehicle dimension. The upper surface portion 31 and the lower surface portion 32 of the jack attachment 30 are each formed in a substantially rectangular shape and arranged in parallel.

[0034] The jack attachment 30 has a jack recess 33 in its lower surface portion 32 that is recessed upward to accommodate the jack. The jack recess 33 is formed as a roughly rectangular recess extending from the lower surface portion 32 toward the upper surface portion. As shown in Figure 5, the jack recess 33 has a bottom portion 33a that extends parallel to the upper surface portion 31 and the lower surface portion 32, and a side portion 33b that extends in a direction perpendicular to the bottom portion 33a.

[0035] The jack attachment 30 has a through-hole 34 formed in a substantially circular cross-section, through which the collar member 40 is inserted, penetrating from the upper surface 31 to the lower surface 32. The upper portion 34a of the through-hole 34 is formed to have a smaller diameter than the lower portion 34b of the through-hole 34. A stepped portion 34c is formed between the upper portion 34a and the lower portion 34b of the through-hole 34, extending parallel to the upper surface 31 and the lower surface 32.

[0036] The collar member 40 is formed in a substantially cylindrical shape and has a bolt insertion hole 41. The collar member 40 has a large diameter portion 42 and a small diameter portion 43 which has smaller outer and inner diameter dimensions than the large diameter portion 42, and has a stepped portion 44 between the large diameter portion 42 and the small diameter portion 43 that extends in a direction perpendicular to the axial direction of the collar member 40.

[0037] The large-diameter portion 42 and the small-diameter portion 43 of the collar member 40 are formed to fit into the lower portion 34b and the upper portion 34a of the insertion hole 34 of the jack attachment 30, respectively. A jack contact portion 47 is provided on the lower surface portion 45 of the collar member 40, against which the jack will contact. A bolt housing hole 46 for accommodating the head of a bolt B1, which is a fastening member, is formed on the lower surface portion 45 of the large-diameter portion 42, and the bolt housing hole 46 is formed by the inner surface of the large-diameter portion 42 and the stepped portion 44.

[0038] The jack attachment 30 has two positioning protrusions 35 for aligning with the battery frame 20 when positioned below the battery frame 20. The positioning protrusions 35 protrude cylindrically from the upper surface 31 of the jack attachment 30. Positioning holes (not shown) are formed in the lower surface 23 of the battery frame 20 to align with the jack attachment 30, corresponding to the positioning protrusions 35.

[0039] As shown in Figure 3, the jack attachment 30 is mounted below the battery frame 20 by aligning the positioning projection 35 with the positioning hole in the battery frame 20 and positioning it on the lower surface 23 of the battery frame 20, and then attaching the collar member 40 to the side sill 10.

[0040] When the collar member 40 is attached to the side sill 10, it passes through the insertion hole 34 of the jack attachment 30 and the insertion hole 21a of the battery frame 20 and comes into contact with the lower surface 11b of the side sill 10, specifically the side sill inner 11. The collar member 40 also has a stepped portion 44 that comes into contact with the stepped portion 34c of the jack attachment 30, and positions the jack attachment 30 between the upper surface 31 of the collar member 40 and the lower surface 23 of the battery frame 20.

[0041] The collar member 40 is attached to the side sill 10 by fastening a bolt B1 inserted from below as a fastening member to a nut N1 inside the side sill 10, with the bolt B1 being fastened to the nut N1 through the bolt insertion hole 11f of the side sill 10. The jack attachment 30 is supported by the vehicle body 1 by the collar member 40 being attached to the side sill 10. When the collar member 40 is attached to the side sill 10, as shown in Figure 5, the jack contact portion 47 protrudes downward from the peripheral edge of the insertion hole 34 of the jack attachment 30 through which the collar member 40 is inserted, specifically from the bottom surface portion 33a of the jack recess 33.

[0042] As a result, when jacking up, the load input from the jack 9 can be transmitted from the jack contact portion 47 to the side sill 10 through the collar member 40, and the load input from the jack 9 can be transmitted from the jack contact portion 47 to the battery frame 20, preventing the battery frame 20 from deforming and damaging the seal portion with the battery frame 20, thereby preventing damage to the battery housing 6.

[0043] In this description, a jack attachment 30 located on the left side and rear of the vehicle body 1 is described, but other jack attachments 30 are configured similarly. The collar member 40 for attaching the jack attachment 30 is formed in a substantially cylindrical shape, but it may have other shapes as long as it abuts against the side sill 10 and is attached to the side sill 10 using a fastening member. The jack recess 33 is formed in a rectangular shape in plan view, but it may have other shapes such as a circular shape in plan view.

[0044] As described above, the lower body structure of the vehicle according to this embodiment includes a jack attachment 30 positioned on the lower surface portion 23 of the battery frame 20, and a collar member 40 formed in an annular shape for attaching the jack attachment 30. The collar member 40 is inserted through the jack attachment 30 and the battery frame 20 and abuts against the side sill 10, and is attached to the side sill 10 using fastening members B1 and N1, and a jack contact portion 47 is provided on the lower surface portion 45 of the collar member 40.

[0045] When a jack attachment 30 is positioned on the lower surface portion 23 of a battery frame 20 attached to a side sill 10, a jack contact portion 47 is provided on the lower surface portion 45 of a collar member 40 that passes through the jack attachment 30 and the battery frame 20 and contacts the side sill 10. This allows the load input from the jack 9 to be transmitted from the jack contact portion 47 through the collar member 40 to the side sill 10 during jacking up, thereby suppressing the input of the load from the jack 9 to the battery frame 20.

[0046] Furthermore, the jack contact portion 47 protrudes downward from the peripheral edge of the insertion hole 34 of the jack attachment 30 through which the collar member 40 is inserted. This prevents the jack 9 from contacting the jack attachment 30 when jacking up, and allows the jack 9 to contact the jack contact portion 47 of the collar member 40, thereby transmitting the load input from the jack 9 to the side sill 10.

[0047] Furthermore, the lower surface portion 32 of the jack attachment 30 is provided with a jack recess 33 that is recessed upward to accommodate the jack 9, and the jack contact portion 47 protrudes downward from the bottom surface portion 33a of the jack recess 33. This prevents the jack 9 from coming off the jack contact portion 47 by positioning it within the jack recess 33, while also allowing the load input from the jack 9 to be transmitted from the jack contact portion 47 to the side sill 10 during jacking up.

[0048] Furthermore, the battery frame 20 has a closed section 21 extending in the longitudinal direction of the vehicle body, and an insertion hole 21a is formed in the closed section 21 through which the collar member 40 is inserted. As a result, even when the battery frame 20 has a closed section 21 extending in the longitudinal direction of the vehicle body, forming an insertion hole 21a in the closed section 21 makes it possible to reduce weight and increase the strength and rigidity of the battery frame 20 with the closed section 21, while suppressing the input of the load from the jack 9 to the battery frame 20 when the vehicle is jacked up.

[0049] This disclosure is not limited to the embodiments described herein, and various improvements and design modifications are possible without departing from the spirit of this disclosure.

[0050] [Note 1] A lower body structure of a vehicle comprising a floor panel, side sills connected to both ends of the floor panel in the vehicle width direction and extending in the longitudinal direction of the vehicle body, a battery housing positioned below the floor panel, and a battery frame that supports the battery housing and extends in the longitudinal direction of the vehicle body and is attached to the side sills, A jack attachment positioned on the lower surface of the battery frame, A collar member formed in an annular shape for attaching the jack attachment, Equipped with, The collar member is inserted through the jack attachment and the battery frame and abuts against the side sill, and is attached to the side sill using a fastening member. A jack contact portion is provided on the lower surface of the aforementioned color member for contacting a jack. The lower body structure of the vehicle. [Note 2] The jack contact portion protrudes downward from the peripheral edge of the insertion hole of the jack attachment through which the collar member is inserted. The lower body structure of the vehicle described in Appendix 1. [Note 3] The lower surface of the jack attachment is provided with a recess for the jack that is recessed upward and accommodates the jack. The jack contact portion protrudes downward from the bottom surface of the jack recess. The lower body structure of the vehicle described in Appendix 1 or Appendix 2. [Note 4] The battery frame has a closed cross-section portion that extends in the longitudinal direction of the vehicle body. An insertion hole is formed in the closed cross-section through which the collar member is inserted. The lower body structure of the vehicle described in any of the appendices 1 to 3. [Explanation of Symbols]

[0051] 1. Vehicle body 4 Floor Panels 6 Battery housing 10 Side sill 20 Battery Frames 21 Closed section 21a Through hole (through hole in the battery frame) 30 Jack Attachment 33 Recess for jack 34. Through hole (through hole for jack attachment) 40 Color components 47 Jack contact area B1, N1 fastening members

Claims

1. A lower body structure of a vehicle comprising a floor panel, side sills connected to both ends of the floor panel in the vehicle width direction and extending in the longitudinal direction of the vehicle body, a battery housing positioned below the floor panel, and a battery frame that supports the battery housing and extends in the longitudinal direction of the vehicle body and is attached to the side sills, A jack attachment positioned on the lower surface of the battery frame, A collar member formed in an annular shape for attaching the jack attachment, Equipped with, The collar member is inserted through the jack attachment and the battery frame and abuts against the side sill, and is attached to the side sill using a fastening member. A jack contact portion is provided on the lower surface of the aforementioned color member for contacting a jack. The lower body structure of the vehicle.

2. The jack contact portion protrudes downward from the peripheral edge of the insertion hole of the jack attachment through which the collar member is inserted. The lower body structure of the vehicle according to claim 1.

3. The lower surface of the jack attachment is provided with a recess for the jack that is recessed upward and accommodates the jack. The jack contact portion protrudes downward from the bottom surface of the jack recess. The lower body structure of the vehicle according to claim 1.

4. The battery frame has a closed cross-section portion that extends in the longitudinal direction of the vehicle body. An insertion hole is formed in the closed cross-section through which the collar member is inserted. The lower body structure of the vehicle according to claim 1.

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