Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
  • B60J5/00—Doors
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
  • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
  • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
  • B60R19/04—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects formed from more than one section in a side-by-side arrangement
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62D—MOTOR VEHICLES; TRAILERS
  • B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
  • B62D21/02—Understructures, i.e. chassis frame on which a vehicle body may be mounted comprising longitudinally or transversely arranged frame members

Definitions

• the present invention relates to a frame structure for an automobile.
• a frame structure for an automobile comprising: a first member made of a metallic material having a tensile strength of 780 MPa or more; a second member made of a metallic material and arranged on the vehicle interior side of the first member; and a hollow portion formed by the first member and the second member and extending in an axial direction of the frame structure, wherein the first member has a side wall that constitutes a wall portion on the vehicle exterior side of the hollow portion, a stepped wall portion extending from the side wall toward the vehicle interior side, and a ridge portion extending in the axial direction connecting the side wall and the stepped wall portion, the stepped wall portion having a first wall portion joined to the second member and extending parallel to a joint surface with the second member, and a second wall portion located on the inner side of the hollow portion than the first wall portion and connected to the ridge portion, wherein the plate thickness of the first member is 2.3 mm or more, and a step height
• FIG. 1 is a diagram showing an example of a ladder frame to which the frame structure according to the first embodiment is applied;
• FIG. FIG. 2 is a cross-sectional view illustrating a schematic configuration of a side rail as a frame structure according to the first embodiment.
• 10 is a diagram for explaining the definitions of the step height h, cross-sectional height h 0 , step width w, and cross-sectional width w 0 of a stepped wall portion.
• FIG. 1 is a diagram showing a schematic configuration of a press-forming device for explaining an example of a method for manufacturing an outer panel having a stepped wall portion.
• FIG. FIG. 10 is a diagram showing an example in which a side frame as a frame structure according to a second embodiment is attached to a battery case.
• FIG. 10 is a cross-sectional view for explaining the schematic configuration of a side frame as a frame structure according to a second embodiment.
• 10A and 10B are diagrams illustrating an example of the structure of a side frame.
• 10A and 10B are diagrams illustrating an example of the structure of a side frame.
• 10A and 10B are diagrams for explaining an analytical model of a three-point bending simulation assuming a side collision with a pole.
• 10A and 10B are diagrams for explaining the definition of the intrusion amount of the frame structure into the vehicle body at the time of a pole collision.
• FIG. 10 is a diagram showing the relationship between the step height h/cross-sectional height h 0 and the penetration amount.
• FIG. 10 is a diagram showing the relationship between the step height h/cross-sectional height h 0 and the penetration amount.
• the outer panel 20 with stepped wall portions is manufactured using, for example, the press molding device shown in Figure 4. Specifically, the central portion of the blank 45 (the portion corresponding to the side wall 21 of the molded product) is clamped between a pad 46 and a punch 47, and the die 48 is lowered in this state.
• the radius of curvature at the center of the thickness of each ridge line portion of each panel 20, 30 is, for example, 5.0 to 15.0 mm.
• the axial length of each panel 20, 30 is, for example, 500 to 5000 mm.
• cross-sectional height refers to the maximum length in the vehicle height direction (Z direction) of the outer panel 20.
• the cross-sectional height h0 is the length in the Z direction from the lower surface of the first wall portion 22a of the bottom wall 22 to the upper surface of the first wall portion 23a of the top wall 23.
• h/h 0 is preferably 0.08 or less.
• h/h 0 is more preferably 0.07 or less, and even more preferably 0.06 or less.
• w/w 0 is preferably 0.60 or less. More preferably, it is 0.55 or less, and even more preferably 0.50 or less.
• the side rails 10, 11 with stepped wall portions according to this embodiment can reduce the amount of intrusion into the vehicle body during a side collision, improving collision performance. Furthermore, because the linear length of the side rails 10, 11 in a cross section perpendicular to the axial direction is approximately the same as the linear length of a side frame (not shown) that does not have stepped wall portions, there is no substantial increase in weight due to the provision of stepped wall portions. In other words, the side rails 10, 11 with stepped wall portions according to this embodiment can be said to be a frame structure with excellent collision performance without a substantial increase in weight.
• Second Embodiment 5 is a diagram illustrating side frames 60, 61 as a frame structure according to the second embodiment.
• the side frames 60, 61 are provided on the sides of the battery case 50.
• the battery case 50 has a pair of side walls 51, 52 extending in the vehicle length direction (X direction), with the side frame 60 attached to the side wall 51 and the side frame 61 attached to the side wall 52.
• the inner panel 30 has a side wall 31 and a top wall 33. It also has a flange 34 that extends from the lower end of the side wall 31 toward the inside in the vehicle width direction (negative side in the Y direction), and a flange 35 that extends upward in the vehicle height direction from the outer end of the top wall 33 in the vehicle width direction (positive end in the Y direction).
• the hollow portion 40 is formed by joining the side wall 21 of the outer panel 20 and the flange 35 of the inner panel 30 together, and by joining the bottom wall 22 of the outer panel 20 and the flange 34 of the inner panel 30 together. Furthermore, the side frame 60 is attached to the battery case 50 by, for example, joining the side wall 31 or flange 34 of the inner panel 30 to the battery case 50.
• the structure of the side frame 60 is not limited to the structure shown in Figure 6, and may be, for example, a structure as shown in Figure 7.
• the outer panel 20 is not generally L-shaped, but has a shape that includes a side wall 21, a bottom wall 22 which is a stepped wall portion, a top wall 26, and a flange 27.
• the top wall 26 extends from the upper end of the side wall 21 toward the inside in the vehicle width direction (negative side in the Y direction), and the flange 27 extends upward from the inside end of the top wall 26 in the vehicle width direction.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Transportation (AREA)
• Body Structure For Vehicles (AREA)

Priority Applications (2)

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Publications (1)

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Family Applications (1)

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Citations (3)

• 2025
  • 2025-02-13 WO PCT/JP2025/004772 patent/WO2025173741A1/ja active Pending
  • 2025-02-13 CN CN202580004320.0A patent/CN121773057A/zh active Pending
  • 2025-02-13 JP JP2025538437A patent/JP7842373B2/ja active Active

Patent Citations (3)

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