WO2018131516A1 - 構造部材及び車両用構造部材 - Google Patents
構造部材及び車両用構造部材 Download PDFInfo
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- WO2018131516A1 WO2018131516A1 PCT/JP2017/047316 JP2017047316W WO2018131516A1 WO 2018131516 A1 WO2018131516 A1 WO 2018131516A1 JP 2017047316 W JP2017047316 W JP 2017047316W WO 2018131516 A1 WO2018131516 A1 WO 2018131516A1
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- WO
- WIPO (PCT)
- Prior art keywords
- strength
- structural member
- side wall
- low
- ridge line
- Prior art date
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Classifications
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- 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
- B62D21/15—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
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- 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
- B60R19/03—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by material, e.g. composite
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
-
- 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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- B60Y2306/00—Other features of vehicle sub-units
- B60Y2306/01—Reducing damages in case of crash, e.g. by improving battery protection
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/02—Side panels
- B62D25/025—Side sills thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/04—Door pillars ; windshield pillars
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/06—Fixed roofs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/08—Front or rear portions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/20—Floors or bottom sub-units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2224/00—Materials; Material properties
- F16F2224/02—Materials; Material properties solids
- F16F2224/0233—Materials; Material properties solids deforming plastically in operation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
Definitions
- the present invention relates to a structural member having impact resistance and a structural member for a vehicle using the structural member.
- the structural member having a tubular portion formed by a hat member having a hat-shaped cross section and a closing plate joined to the hat member is used in various applications.
- Applications include, for example, structural members of vehicles, buildings, and large containers. Particularly, structural members used in automobiles are required to have impact resistance.
- Patent Document 1 discloses a metal tube attached to the body of an automobile in a structure that supports both ends for impact resistance.
- This metal tube has a full length or a partially bent portion. It arrange
- This metal pipe has excellent impact resistance for reinforcing the vehicle body as compared with a reinforcing member using a straight pipe.
- the structural member having a tubular part is bent when subjected to an impact exceeding the yield strength, and the bent part protrudes.
- this structural member is thinned for weight reduction, the degree of protrusion when it is broken by an impact tends to increase.
- a structural member used in an automobile has a small degree of protrusion inward when an impact is applied from the outside of the vehicle.
- the degree of protrusion of the portion deformed by the impact of the collision in the structural member is smaller.
- the present application discloses a structural member that can further reduce the degree of protrusion during deformation due to impact, and a vehicle structural member using the structural member.
- the structural member according to one aspect of the present invention includes at least one closing plate and a hat member.
- the hat member includes a top surface portion, two first ridge lines at both ends of the top surface portion, two flanges each joined to the closing plate, and two at the end portions of the two flanges. A second ridge line; and two sidewalls positioned between the two first ridge lines and the two second ridge lines.
- the length in the extending direction of the first ridge line of the tubular part formed by the hat member and the closing plate is the longer of the two side walls in the direction perpendicular to the top surface part. It is 6 times or more of H.
- Each of the two side walls includes a high strength portion and a low strength portion.
- the high-strength portion is formed in a portion opposite to the two side walls over a distance of 2/3 times or more and 3 times or less of H in the extending direction of the first ridgeline.
- the yield strength of the high strength portion is 500 MPa or more.
- the low strength portion is disposed on both sides of the high strength portion in the extending direction of the first ridge line.
- the yield strength of the low strength portion is 60 to 85% of that of the high strength portion.
- FIG. 1A It is a figure which shows the structural example of the structural member by which both ends were supported. It is a figure which shows the example of a deformation
- FIG. 15A is a graph showing a simulation result of the impactor stroke when a fold occurs.
- FIG. 15B is a graph showing a simulation result of the impactor stroke when a fold occurs. It is a graph which shows the deformation
- the inventor examined the behavior of a structural member having a tubular portion formed by a member having a hat-shaped cross section (hereinafter referred to as a hat member) and a closing plate joined to the hat member with respect to impact.
- the structural member 5 is formed extending in the longitudinal direction of the tubular portion.
- the structural member 5 often constitutes a part of a structure (for example, a vehicle, a building, a container, or the like) in a state where both ends in the longitudinal direction of the tubular portion are supported. Therefore, the inventor examined the behavior of the structural member supported at both ends against impact.
- the dimension (length) in the longitudinal direction of the tubular portion of the structural member is about 6 times or more than the dimension of the structural member in the direction in which the impact is applied, the degree of deformation due to the impact may increase. I understood.
- the structural member 5 breaks and deforms early after the impact is applied. (See FIG. 1B).
- the structural member 5 is also deformed when an impact is applied to the position (y2 in FIG. 1A) between the longitudinal center of the structural member 5 and the one support portion 32 (see FIG. 1C).
- the impact is applied to the center (y1) in the longitudinal direction of the structural member 5, the degree of protrusion of the early bending deformation is greater than when the impact is applied to y2.
- the moment load was highest when an impact was applied to the longitudinal center of the structural member 5 supported at both ends.
- the inventor examined reducing the degree of deformation of the structural member due to impact by increasing the strength of the structural member. However, even if the strength of the structural member is increased, it is difficult to reduce the degree of protrusion due to deformation. This is because, when the strength of the structural member is increased, it becomes difficult to deform with respect to the impact, but the degree of protrusion when deformed by the impact does not change much. Therefore, the inventor further studied to suppress the bending deformation by changing the strength distribution of the structural member.
- the inventor has come up with a configuration in which low strength portions having lower strength than other portions are arranged side by side in the longitudinal direction on the side wall of the structural member. That is, the present inventors have conceived a configuration in which low strength portions having lower strength than the high strength portions are arranged on both sides of the high strength portion. In other words, the high strength portion is sandwiched between the low strength portions in the longitudinal direction of the structural member. In this configuration, it was found that a load due to an impact applied to the high strength portion is transmitted to the low strength portion, and bending deformation is suppressed.
- the degree of deformation due to impact on the high strength portion can be set. It has been found that it can be effectively reduced. Based on this knowledge, the inventors arrived at the structural member of the following embodiment.
- the structural member of the structure 1 in the embodiment of the present invention includes at least one closing plate and a hat member.
- the hat member includes a top surface portion, two first ridge lines at both ends of the top surface portion, two flanges each joined to the closing plate, and two at the end portions of the two flanges. A second ridge line; and two sidewalls positioned between the two first ridge lines and the two second ridge lines.
- the length in the extending direction of the first ridge line of the tubular part formed by the hat member and the closing plate is the longer of the two side walls in the direction perpendicular to the top surface part. It is 6 times or more of H.
- Each of the two side walls includes a high strength portion and a low strength portion.
- the high-strength portion is formed in a portion opposite to the two side walls over a distance of 2/3 times or more and 3 times or less of H in the extending direction of the first ridgeline.
- the yield strength of the high strength portion is 500 MPa or more.
- the low strength portion is disposed on both sides of the high strength portion in the extending direction of the first ridge line.
- the yield strength of the low strength portion is 60 to 85% of that of the high strength portion.
- the length H of the side wall in the direction perpendicular to the top surface portion is defined by the distance between the first ridge line and the second ridge line of each side wall in the direction perpendicular to the top surface portion. The longer of the lengths.
- the two flanges extend in directions away from each of the second ridge lines.
- the direction perpendicular to the top surface portion is a direction perpendicular to the surface of the top surface portion, that is, a vertical direction of the top surface.
- the structural member of the structure 1 has a small degree of deformation with respect to the impact applied from the top surface portion of the hat material.
- the structural member of the structure 2 in the embodiment of the present invention includes at least one closing plate and a hat member.
- the hat member includes a top surface portion, two first ridge lines at both ends of the top surface portion, two flanges each joined to the closing plate, and two at the end portions of the two flanges. A second ridge line; and two sidewalls positioned between the two first ridge lines and the two second ridge lines.
- the length in the extending direction of the first ridge line of the tubular portion formed by the hat member and the closing plate is the longer one of the lengths of the two side walls in the direction perpendicular to the closing plate. It is 6 times or more of H.
- Each of the two side walls includes a high strength portion and a low strength portion.
- the high-strength portion is formed in a portion opposite to the two side walls over a distance of 2/3 times or more and 3 times or less of H in the extending direction of the first ridgeline.
- the yield strength of the high strength portion is 500 MPa or more.
- the low strength portion is disposed on both sides of the high strength portion in the extending direction of the first ridge line.
- the yield strength of the low strength portion is 60 to 85% of that of the high strength portion.
- the length H of the side wall in the direction perpendicular to the closing plate is defined by the distance between the first ridge line and the second ridge line of each side wall in the direction perpendicular to the closing plate. The longer of the lengths. Note that the two flanges extend in directions away from each of the second ridge lines.
- the direction perpendicular to the closing plate is the direction perpendicular to the surface of the closing plate.
- the structural member of the structure 2 has a small degree of deformation with respect to the impact applied from the closing plate.
- the structural member of the structure 3 in the embodiment of the present invention includes at least one closing plate and a groove member.
- the groove member includes a top surface portion, two first ridgelines at both ends of the top surface portion, two joint portions each joined to the closing plate, the two first ridgelines, and the Between the two joints, there are two side walls located respectively.
- the length in the extending direction of the first ridge line of the tubular portion formed by the groove member and the closing plate is the longer length of the side walls in the direction perpendicular to the top surface portion. It is more than 6 times the height H.
- Each of the two side walls includes a high strength portion and a low strength portion.
- the high-strength portion is formed in a portion opposite to the two side walls over a distance of 2/3 times or more and 3 times or less the length H in the extending direction of the first ridgeline.
- the yield strength of the high strength portion is 500 MPa or more.
- the low strength portion is disposed on both sides of the high strength portion in the extending direction of the first ridge line.
- the yield strength of the low strength portion is 60 to 85% of that of the high strength portion.
- the length H of the side wall in the direction perpendicular to the top surface portion is set such that the first ridge line of each side wall in the direction perpendicular to the top surface portion and the first ridge line extend through the joint portion.
- the structural member of structure 3 is different from structure 1 in that there is no flange. That is, the hat material of structure 1 is a groove type material in structure 3.
- the structural member of the structure 3 has a small degree of deformation with respect to the impact applied from the top surface portion of the grooved material.
- the structural member of the structure 4 in the embodiment of the present invention includes at least one closing plate and a groove member.
- the groove member has one top surface portion, two first ridgelines at both ends of the top surface portion, a flange joined to the closing plate, and one second surface at the end of the flange.
- the length in the extending direction of the first ridge line of the tubular portion formed by the groove member and the closing plate is the length of the first side wall or the second length in the direction perpendicular to the top surface portion.
- the first side wall includes a high strength portion and a low strength portion.
- the high-strength portion of the first side wall is not less than 2/3 times and not more than 3 times the H in the extending direction of the first ridge line of the tubular portion at a portion facing the second side wall. Formed over distance.
- the yield strength of the high strength portion is 500 MPa or more.
- the low strength portion is disposed on both sides of the high strength portion in the extending direction of the first ridge line. The yield strength of the low strength portion is 60 to 85% of that of the high strength portion.
- the second side wall includes a high strength portion and a low strength portion.
- the high-strength portion of the second side wall is 2/3 times or more than the length H in the extending direction of the first ridge line of the tubular portion at a portion facing the first side wall. It is formed over the following distance.
- the yield strength of the high strength portion is 500 MPa or more.
- the low strength part. It arrange
- the yield strength of the low strength portion is 60 to 85% of that of the high strength portion.
- the length H is a length defined by a distance between the first ridge line and the second ridge line of the first side wall in a direction perpendicular to the top surface portion, and is perpendicular to the top surface portion.
- the structural member of the structure 4 is a modification of the structure 3.
- the structure 3 is different in that there is no flange at both ends of the channel material, whereas the structure 4 has a flange at one end.
- the structural member of the structure 4 has a small degree of deformation with respect to the impact applied from the top surface portion of the grooved material.
- the deformation due to the load due to the impact on the high strength portion can be dispersed to the low strength portion at an early stage.
- bending deformation of the structural member due to impact can be suppressed.
- the deformation of the structural member is further suppressed.
- the deformation of the structural member is further suppressed when an impact is applied to the closing plate.
- the length H is the height of the side wall.
- the direction perpendicular to the top surface portion is defined as the height direction of the side wall.
- the direction perpendicular to the closing plate is the height direction of the side wall.
- the length of the low-strength portion in the extending direction of the first ridge line is not less than 3/5 times and not more than twice the length H. This further suppresses the degree of deformation of the structural member due to the impact on the high-strength portion.
- the structure 6 will be described.
- the high-strength portion between the low-strength portions is disposed at the center in the extending direction of the first ridge line in the tubular portion.
- the moment due to impact tends to increase.
- the high strength portion is arranged at the center in the extending direction of the first ridge line and the low strength is arranged on both sides thereof, whereby deformation of the structural member due to impact can be efficiently suppressed.
- the low-strength portion of the low-strength portion is in a region up to (4/5) of the length between the one end and the other end of the side wall An end portion on the other end side may be located.
- the length of the low-strength portion in the direction from the one end to the other end is 1/5 or more of the length between the one end and the other end of the side wall.
- the structure 7 or 8 may include a region adjacent to an end of the low strength portion between the one end and the other end of the side wall and having a higher yield stress than the low strength portion.
- the deformation of the structural member against the impact on the top surface portion can be efficiently suppressed.
- the first ridge line becomes one end of the side wall
- the second ridge line becomes the other end of the side wall.
- the length between one end and the other end of the side wall is the interval (distance) between the first ridge line and the second ridge line.
- the first ridge line is one end
- the joint line connecting the joint portion in the extending direction of the first ridge line is the other end. Therefore, the length between the one end and the other end of the side wall is defined by the interval (distance) between the first ridge line and the joining line.
- the side wall is disposed between the one end of the side wall opposite to the first ridge line side and the other end of the first ridge line side from the one end of the side wall toward the other end. There may be an end portion on the one end side of the low-strength portion in a region up to a position of 1 ⁇ 4 of the length between the one end and the other end.
- the length between the one end and the other end of the side wall is defined by the interval (distance) between the first ridge line and the second ridge line. Is done.
- the length between the one end and the other end of the side wall connects the first ridge line and the joint in the extending direction of the first ridge line. It is defined by the distance (distance) from the joint line.
- the structure 12 Next, the structure 12 will be described.
- the low strength An end portion on the other end side of the portion may be located.
- the length of the low-strength portion in the direction from the one end to the other end is 1/5 or more of the length between the one end and the other end of the side wall.
- the structure 11 or 12 may include a region adjacent to an end of the low-strength portion between the one end and the other end of the side wall and having a higher yield stress than the low-strength portion.
- the structure 14 will be described.
- the end portion on the one end side of the high-strength portion located between the low-strength portions may be located in a region between the positions of (2/5) of the length from to the other end. .
- an end portion on the other end side of the high strength portion is located at the other end of the side wall.
- An additional low-strength portion having a yield strength of 60 to 85% of the high-strength portion is provided from the end portion on the one end side of the high-strength portion to one end of the side wall.
- the deformation of the structural member against the impact on the closing plate can be efficiently suppressed.
- the length between one end and the other end of the side wall is the interval (distance) between the first ridge line and the second ridge line.
- the joint line connecting the joint portion in the extending direction of the first ridge line is one end, and the first ridge line is the other end. Therefore, the length between the one end and the other end of the side wall is defined by the interval (distance) between the first ridge line and the joining line.
- the structural member is preferably curved so as to be convex toward the closing plate. Thereby, it becomes difficult for a structural member to deform
- the closing plate includes a pair of overlapping portions that are overlapped with the hat member or the groove member and an intermediate portion between the pair of overlapping portions. The intermediate portion is formed so as to protrude in a direction away from the hat member or the groove member with respect to the overlapping portion.
- the structural member of the structure 18 is obtained by attaching any one of the structural members 1 to 17 to the vehicle.
- the top surface part or the closing plate is two connecting parts provided at two locations separated by 6H or more in the extending direction of the first ridge line, and two connecting parts connected to other members including.
- FIG. 2A is a perspective view showing a configuration of the structural member 10 in the present embodiment.
- FIG. 2B is a side view of the structural member 10 shown in FIG. 2A as viewed from the longitudinal direction (y direction).
- FIG. 2C is a side view of the structural member 10 shown in FIG. 2A viewed from a direction perpendicular to the longitudinal direction (x direction).
- a structural member 10 shown in FIGS. 2A to 2C includes a hat member 1 having a hat-shaped cross section, and a closing plate 2 joined to the hat member 1.
- the structural member 10 has a tubular portion formed by the hat member 1 and the closing plate 2.
- the tubular portion has a space surrounded by the hat member 1 and the closing plate 2 inside. That is, the tubular portion has a closed cross-sectional structure.
- the hat member 1 has a top surface portion 13, a pair of side walls 11 and 12, and a pair of flanges 14.
- the pair of side walls 11 and 12 extend from both ends of the top surface portion 13 and face each other.
- the pair of flanges 14 extend outward in the opposing direction of the pair of side walls 11, 12 from the other end of the pair of side walls 11, 12 opposite to the one end on the side of the top surface 13 of the side walls 11, 12.
- the closing plate 2 is provided by being joined to a pair of flanges 14.
- a boundary portion (shoulder portion) 123 between the top surface portion 13 and the pair of side walls 11 and 12 forms a first ridge line 123.
- the longitudinal direction of the tubular portion is the extending direction of the first ridge line 123, but the longitudinal direction of the tubular portion and the extending direction of the first ridge line 123 may not be the same.
- the longitudinal direction of a tubular part be the central axis (axial center) which connects the gravity center of the cross section of a tubular part.
- a boundary portion (shoulder portion) 124 between the flange 14 and the pair of side walls 11 and 12 forms a second ridgeline 124 extending in the longitudinal direction of the tubular portion.
- the extending direction of the second ridge line 124 may not be the same as the longitudinal direction of the tubular portion.
- the longitudinal direction of the tubular portion is the y direction, which is the same as the longitudinal direction of the structural member 10.
- the dimension in the extending direction (y direction) of the ridge formed at the boundary portion between the top surface portion 13 and the pair of side walls 11 and 12 is in the direction (x direction) in which the pair of side walls 11 and 12 face each other. It is longer than the dimensions.
- the length LY in the extension phrase of the first ridgeline 123 of the tubular portion formed by the hat member 1 and the closing plate 2 is 6 times or more the height H of the side walls 11 and 12, that is, 6H or more ( LY ⁇ 6H).
- the extending direction of the first ridge line 123 and the extending direction of the second ridge line 124 may be different.
- Each of the pair of side walls 11 and 12 includes high-strength portions 11A and 12A and low-strength portions 11B and 12B.
- High strength portions 11 ⁇ / b> A and 12 ⁇ / b> A are provided at portions of the pair of side walls 11 and 12 that face each other. That is, of the pair of side walls 11 and 12, the high strength portion 11A of one side wall 11 and the high strength portion 12A of the other side wall 12 are provided at positions facing each other.
- the low-strength portions 11B and 12B are also provided in portions of the pair of side walls 11 and 12 that face each other. That is, the low strength portion 11B of one side wall 11 and the low strength portion 12B of the other side wall 12 are provided in portions facing each other.
- the dimension LA in the extending direction of the first ridgeline 123 of the high-strength portions 11A and 12A facing each other is (2/3) H or more and 3H or less (2H / 3 ⁇ LA ⁇ 3H ).
- the yield strength of the high strength portions 11A and 12A is 500 MPa (980 MPa in the case of tensile strength) or more.
- the low strength portions 11B and 12B are disposed on both sides in the extending direction of the first ridgeline 123 of the high strength portions 11A and 12A. That is, in the longitudinal direction of the tubular portion, the high strength portions 11A and 12A are disposed between the low strength portions 11B and 12B.
- the yield strength of the low strength portions 11B and 12B is 60 to 85% (60% to 85%) of the yield strength of the high strength portions 11A and 12A.
- the tensile strength of the low strength portions 11B and 12B is desirably 60 to 85% of the tensile strength of the high strength portions 11A and 12A.
- the low strength portions 11B and 12B are paired in the pair of side walls 11 and 12, respectively. That is, in one side wall 11 of the pair of side walls, a pair of low strength portions 11B are provided on both sides of the high strength portion 11A. In the other side wall 12 of the pair of side walls, a pair of low strength portions 12B are provided on both sides of the high strength portion 12A.
- Yields of outer portions 11C and 12C in the extending direction of the first ridgeline 123 of the low strength portions 11B and 12B that is, the portions 11C and 12C of the side walls 11 and 12 other than the high strength portions 11A and 12A and the low strength portions 11B and 12B.
- the strength is higher than that of the low strength portions 11B and 12B.
- the yield strength of these portions 11C and 12C may be the same as that of the high strength portions 11A and 12A.
- the low strength portions 11B and 12B are portions where the yield strength is lower than the surroundings.
- the low strength portions 11B and 12B are arranged on both sides of the high strength portions 11A and 12A, thereby the impact load. Can be dispersed in the low-strength portions 11B and 12B without concentrating the deformation by the high-strength portions 11A and 12A.
- the yield strength of the high strength portions 11A and 12A is 500 MPa (980 MPa in the case of tensile strength) or more, the strength ratio of the low strength portions 11B and 11B to the high strength portions 11A and 12A is 60 to 85%,
- the dimension LA of the opposing high-strength portions 11A and 12A is (2/3) H or more and 3H or less, the deformation due to the load due to the impact on the high-strength portions 11A and 12A can be brought about at an early stage. , 12B.
- the strength of the flange 14 and the strength distribution are not particularly limited. This is because the strength of the flange 14 does not particularly affect the performance of the structural member 10.
- FIG. 3 is a diagram for explaining the deformation behavior of the structural member 5 composed of a hat member having a uniform strength distribution and a closing plate.
- FIG. 4 is a view for explaining the deformation behavior of the structural member 10 having the low strength portions 11B and 12B as shown in FIGS. 2A to 2C. 3 and 4 show the deformation behavior when the indenter collides in the direction perpendicular to the longitudinal direction of the tubular portion of the structural member. 3 and 4 show the deformation behavior of the side surface of the structural member as seen from the direction of impact of the indenter and the direction perpendicular to the longitudinal direction of the tubular portion.
- the deformation generated at the bending deformation starting point P due to the impact proceeds in a wedge shape in a side view.
- the structural member 5 is bent so as to protrude sharply in the bending direction (impact direction). In some cases, the structural member 5 may crack.
- the deformation progresses inward from the bending deformation starting point P of the high-strength portion 11A.
- the deformation spreads in the longitudinal direction, and the degree of deformation in the bending direction (impact direction) becomes small.
- the deformation behavior shown in FIGS. 3 and 4 is not limited to when the indenter collides with the structural member.
- a structural member is bent and deformed by an axial force compressing in the longitudinal direction, or when a force perpendicular to the longitudinal direction is applied statically by pressing an indenter against the structural member as in a three-point bending test. Bending deformation can also have similar deformation behavior. Further, in both cases where the indenter collides with the top surface portion of the structural member and when the indenter collides with the closing plate, the deformation behavior is the same as in FIGS.
- the structural member 10 may be used in a state where the structural member 10 is supported at two locations separated in the longitudinal direction.
- the structural member 10 has two connection parts which are parts connected to other members. That is, the structural member 10 is supported by another member at the connecting portion.
- the connecting portion may be referred to as a support portion.
- the connecting portion is provided on at least one of the side walls 11, 12, the top surface portion 13 and the closing plate 2.
- the structural member 10 is fixed to other members.
- the connecting portion of the structural member 10 is joined to another member by, for example, a fastening member or welding. Note that the number of connecting portions may be three or more.
- the two connecting portions may be arranged at positions separated from each other by 6H or more in the extending direction of the first ridgeline 123. That is, the interval KY between the two connecting portions may be 6 times or more the height H of the side walls 11 and 12 (KY ⁇ 6H). In this case, the problem described with reference to FIGS. 1A to 1C similarly occurs. That is, the dimension KY between the two connecting portions is about 6 times or more (KY ⁇ 6H) with respect to the dimension in the direction in which the impact of the structural member is applied (in the example of FIG. 2A, the height H of the side wall 11). In some cases, the degree of deformation due to impact may increase.
- the high-strength portions 11A and 12A and the low-strength portions 11B and 12B are provided between the two connecting portions.
- the degree of protrusion due to the deformation of the structural member 10 can be reduced.
- the structural member 10 when the structural member 10 is used as a vehicle structural member, the structural member 10 is attached to the vehicle in a state where the structural member 10 is supported by at least two connecting portions spaced apart in the longitudinal direction of the tubular portion. At this time, the structural member 10 is attached to the vehicle so that the top surface portion 13 is disposed outside the vehicle and the closing plate 2 is disposed inside the vehicle.
- the structural member 10 can be attached to the vehicle so that the closing plate is disposed outside the vehicle and the top surface portion 13 is disposed inside the vehicle. Thereby, when the structural member 10 receives an impact from the outside of the vehicle, the degree to which the structural member 10 breaks and protrudes into the vehicle can be reduced.
- the dimension LA in the extending direction of the first ridge line 123 of the high strength portions 11A and 12A is relative to the height H of the side walls 11 and 12, regardless of the presence or absence of the connecting portion. 2 / 3H or more and 3H or less (2 / 3H ⁇ LA ⁇ 3H).
- the degree of deformation due to the impact on the high-strength portions 11A and 12A can be further suppressed.
- the dimension LA to be greater than or equal to H and less than or equal to (4/3) H (H ⁇ LA ⁇ (4/3) H)
- the degree of deformation due to impact can be further suppressed.
- the dimension LA in the extending direction of the first ridgeline 123 of the high-strength portions 11A and 12A is (2/3) H or more, preferably H or more. Further, the dimension LA in the extending direction of the first ridgeline 123 of the high-strength portions 11A and 12A is 3H or less, preferably (4/3) H or less.
- the dimension LB in the extending direction of the first ridgeline 123 of the low strength portions 11B and 12B is (3/5) H or more ((3/5) H ⁇ LB).
- the dimension LB of the low-strength portion 11B is desirably 2H or less from the viewpoint of securing the strength of the structural member 10. More preferably, the dimension LB of the low-strength portion 11B is desirably H or less.
- the dimension LA of the high-strength portion and the dimension LB of the low-strength portion with respect to the height H of the side wall are the above relationships, that is, ((2/3) H ⁇ LA ⁇ 3H), (H ⁇ LA ⁇ (4 / 3) H) or ((3/5) H ⁇ LB etc.) is not strictly limited.
- the case where an error that can be regarded as satisfying the above relationship is included is also included.
- the length LY of the structural member 10 with respect to the height H of the side wall is not limited to the case where the above relationship (6H ⁇ LY) is strictly satisfied.
- a structural member having about 6 times the height H of the side wall is regarded as a structural member having the above relationship (6D ⁇ LY).
- the boundary between the low strength portion 11B and the high strength portion 11A and the boundary between the low strength portion 12B and the high strength portion 12A are on a plane perpendicular to the longitudinal direction of the tubular portion.
- the form of the boundary between the low strength portion and the high strength portion is not limited to this.
- the boundary between the low-strength portion and the high-strength portion may not be on a plane perpendicular to the longitudinal direction of the tubular portion.
- the boundary between the low-strength portion and the high-strength portion may be inclined with respect to a plane perpendicular to the longitudinal direction of the tubular portion, or may meander.
- the boundary between the low-strength portion and the high-strength portion is assumed to be located between the position closest to the low-strength portion and the position closest to the high-strength portion among the inclined or meandering boundaries.
- the high-strength portions 11A and 12A may be arranged at a position where the structural member 10 is easily broken in the extending direction of the first ridge line 123, for example, at the center. desirable. That is, it is desirable that at least a part of the high-strength portions 11 ⁇ / b> A and 12 ⁇ / b> A is configured to be located at the center of the extending direction of the first ridge line 123 of the structural member 10. Or as mentioned above, when connecting the structural member 10 with another member in two connection parts, it is desirable to arrange
- the high-strength portions 11A and 12A is located in the central portion between the two connecting portions.
- FIG. 5A is a top view showing a configuration of the structural member 10 shown in FIG. 2A as viewed from above (top surface portion 13, z direction).
- the portions of the side walls 11 and 12 seen through the top surface portion 13 are indicated by broken lines.
- the high-strength portions 11A and 12A facing each other in the pair of side walls 11 and 12 are opposed to the pair of side walls 11 and 12, as in the example shown in FIG. It is desirable that they are arranged so as to completely overlap when viewed from the direction (x direction).
- the entire high-strength portion 11 ⁇ / b> A on one side wall 11 and the entire high-strength portion 12 ⁇ / b> A on the other side wall 12 overlap each other when viewed from the facing direction.
- the low-strength portions 11B and 12B facing each other in the pair of side walls 11 and 12 are also arranged so as to completely overlap when viewed from the facing direction (x direction). That is, the entire pair of low-strength portions 11B on one side wall 11 and the entire pair of low-strength portions 12B on the other side wall 12 overlap each other when viewed from the opposing direction.
- the opposing direction of the pair of side walls 11 and 12 is a direction perpendicular to the longitudinal direction of the tubular portion (that is, the central axis Y1).
- 5A shows a configuration in which the intensity distribution of one side wall 11 of the pair of side walls 11 and 12 and the intensity distribution of the other side wall 12 are mirror images of each other. That is, the high-strength portions 11A and 12A and the low-strength portions 11B and 12B of the pair of side walls 11 and 12 are arranged symmetrically with respect to the central virtual plane Y1 of the pair of side walls 11 and 12, respectively. Thereby, the possibility that either one of the pair of side walls 11 and 12 will be crushed first becomes lower.
- the central virtual surface Y1 of the side walls 11 and 12 corresponds to the perpendicular bisector A of the top surface portion 13 in the cross section perpendicular to the longitudinal direction of the tubular portion (see the difference in FIG. 2B).
- the pair of side walls 11 and 12 have the same height.
- the angle between the side wall 11 and the top surface portion 13 and the angle between the side wall 12 and the top surface portion 13 are also the same. Therefore, in the cross section perpendicular to the longitudinal direction of the tubular portion, the cross-sectional shape of the structural member 10 is symmetrical with respect to the vertical bisector A of the top surface portion 13 as an axis.
- the intensity distribution in the cross section of the structural member 10 is also symmetric with respect to the vertical bisector A. This reduces stress bias due to impact.
- FIG. 5B is a diagram showing a modification of the arrangement of the high strength portions 11A and 12A and the low strength portions 11B and 12B of the structural member 10 shown in FIG. 2A.
- the high-strength portions 11A and 12A facing each other are arranged so as to partially overlap each other when viewed from the facing direction (x direction).
- at least a part of the high-strength portion 11A on the one side wall 11 may be disposed so as to overlap the high-strength portion 12A on the other side wall 12 when viewed from the opposing direction.
- the low-strength portions 11B and 12B facing each other in the pair of side walls 11 and 12 are also arranged so as to partially overlap each other when viewed from the facing direction (x direction). In this manner, at least a part of the pair of low strength portions 11B on the one side wall 11 may be arranged so as to overlap with the pair of low strength portions 12B on the other side wall 12 when viewed from the opposing direction.
- the top surface portion 13 is easily bent obliquely with respect to the central virtual surface Y1. Since the top surface portion 13 is not easily bent at the shortest distance, the impact absorption energy is increased.
- the dimension LA in the extending direction of the first ridgeline 123 of the high-strength portion 11A and the high-strength portion 12A facing each other is the same.
- the dimension LA of the high strength portion 11A of the one side wall 11 and the dimension LA in the extending direction of the first ridge line 123 of the high strength portion 12A of the other side wall 12 satisfy 2 / 3H ⁇ LA ⁇ 3H. As long as it meets, it may be different.
- the dimension LB in the extending direction of the first ridgeline 123 of the low-strength portion 11B and the low-strength portion 12B facing each other is the same.
- the dimension LB in the extending direction of the first ridgeline 123 of the low strength portion 11A and the low strength portion 12A facing each other in the facing direction of the pair of side walls 11 and 12 may be different.
- the dimension LB of the pair of low strength portions 11B sandwiching the high strength portion 11A may be different.
- the dimension LB of the pair of low strength portions 12B sandwiching the high strength portion 12A may be different.
- each LB satisfies 3 / 5H ⁇ LB. Thereby, the deformation of the low-strength portion can be promoted, and as a result, the degree of deformation due to impact can be further suppressed.
- a ridge is formed at the boundary between the top surface portion 13 and the pair of side walls 11 and 12.
- a ridge is formed at the boundary between the flange 14 and the pair of side walls 11 and 12.
- These ridges extend in the longitudinal direction of the tubular portion.
- the ridge increases the strength of the structural member 10 against impact.
- High-strength portions 11A and 12A and low-strength portions 11B and 12B are arranged on the side walls 11 and 12 connected via a ridge to the top surface portion 13 that is a surface that receives an impact. Thereby, the bending deformation of the structural member 10 due to the impact on the top surface portion 13 can be suppressed.
- FIG. 6A is a diagram showing a modification of the arrangement of the low strength portions 11B and 12B of the structural member 10 shown in FIG. 2A.
- the low-strength portion 11B is provided in a part of the side wall 11 in the height direction (z direction). That is, in the side wall 11, the low strength portion 11 ⁇ / b> B is provided in a part from the end portion on the top surface portion 13 side to the end portion on the flange 14 side.
- the low-strength portion 11B is provided in the height direction of the side wall 11 from a position h from the one end 11a (top surface portion 13) of the side wall 11 to a position hb from the other end 11b (flange 14). .
- the end portion 11Ba closer to the one end 11a (one end side) of the low strength portion 11B is located at a distance h from the one end 11a, and is closer to the other end 11b of the low strength portion 11B (the other end side). ) Is at a distance hb from the other end 11b.
- the low strength portion 11B is not in contact with either the one end 11a (top surface portion 13) or the other end 11b (flange 14).
- the low-strength portion 12B in the side wall 12 facing the low-strength portion 11B is also provided in a part of the side wall 12 in the height direction.
- each of the pair of side walls 11 and 12 is allowed to have the low strength portions 11B and 12B in a part in the height direction. Even in the modification shown in FIG. 6A, the degree of protrusion due to the deformation of the structural member 10 that has received an impact can be suppressed.
- the distance h in the height direction of the side walls 11 and 12 from the one end 11a of the side walls 11 and 12 to the end 11Ba closer to the one end 11a of the low strength portions 11B and 12B is , (1/4) H or less is desirable (h ⁇ H / 4). That is, it is desirable to dispose the end portion 11Ba of the low strength portion 11B in a region having a distance of (1/4) H from the one end 11a in the height direction of the side wall.
- the distance h is preferably set to (1/5) H or less (h ⁇ H / 5).
- the yield strength between the end 11Ba closer to the one end 11a of the low strength portions 11B and 12B and the one end 11a may be the same as the yield strength of the high strength portions 11A and 12A.
- the distance hb in the height direction of the side walls 11, 12 from the other end 11b of the side walls 11, 12 to the low strength portions 11B, 12B is equal to or less than (4/5) H (hb ⁇ 4H / 5). ) Is desirable.
- the distance hb is preferably (1/2) H or less (hb ⁇ H / 2).
- the height h (z direction) dimension hc of the side walls 11 and 12 of the low strength portions 11B and 12B is always (1) in order to suppress the degree of deformation whatever h and hb are allowed. / 5) It is necessary to set to H or more ((H / 5 ⁇ hc). In order to further suppress the degree of deformation, the dimension hc is preferably set to (1/4) H or more ((H / 4 ⁇ hc).
- the low strength portion is positioned so that the end portion on the one end side of the low strength portion is located in the region from one end to (1/4) H of both ends in the height direction of the side wall. Forming part. That is, the low-strength portion is formed in at least a part of the region from the position on the side wall that is a distance of (1/4) H from one end of the side wall to the one end of the side wall. Thereby, when an impact is applied from one end side of the side wall, the degree of deformation of the structural member 10 can be reduced.
- the low-strength portion so that the end portion on the other end side of the low-strength portion is located in the region from the other end to (4/5) H among both ends in the height direction of the side wall. .
- the dimension in the height direction of the side wall of the low-strength portion needs to be at least 1 / 5H or more.
- the distances h, hb, and the both ends of the side walls 11 and 12 are defined as one end that is in contact with the top surface portion 13 and the other end is in contact with the flange 14.
- hc was set.
- the values of the distances h, hb, and hc as described above, the degree of deformation of the structural member 10 when an impact is applied to the top surface portion 13 can be reduced.
- the one in contact with the flange 14 is one end and the one in contact with the top surface portion 13 is the other end, and the distances h, hb, hc are It can also be set.
- the values of the distances h, hb, and hc can be set as in the above example. Thereby, the deformation degree of the structural member 10 when an impact is applied to the closing plate 2 can be further reduced.
- FIG. 6D is a diagram illustrating another modification of the arrangement of the high-strength portions 11A and 12A of the structural member 10 illustrated in FIG. 2A.
- the high-strength portion 11A between the low-strength portions 11B is provided from the other end (flange 14) to a position ha in the height direction of the side wall 11.
- an additional low strength portion 11D is provided from the high strength portion 11A to one end (top surface portion 13) of the side wall 11.
- the yield strength of the additional low strength portion 11D is 60 to 85% of the yield strength of the high strength portion 11A.
- the high-strength portion 11 ⁇ / b> A sandwiched between the low-strength portions 11 ⁇ / b> B in the extending direction of the first ridgeline 123 may be provided in a part of the side wall 11 in the height direction.
- the distance ha is, for example, (3/5) H or more.
- the distance ha is preferably set to (4/5) H or more.
- the high-strength portion 12A of the side wall 12 may also be provided from the other end (flange 14) to a position ha in the height direction of the side wall 12. In this case, an additional low-strength portion is provided from the high-strength portion 12A to one end (top surface portion 13) of the side wall 12 in the height direction of the side wall.
- the end portion on the one end side of the high strength portion is arranged in the region from one end of the side wall to (2/5) H, and the end portion on the other end side of the high strength portion is disposed on the other end of the side wall. Place.
- an additional low-strength portion is provided between one end of the high-strength portion and one end of the side wall.
- one end of the side wall 11 is in contact with the top surface portion 13 and the other end is in contact with the flange 14.
- the degree of deformation of the structural member 10 when an impact is applied to the top surface portion 13 can be reduced.
- the one in contact with the flange 14 is one end and the one in contact with the top surface portion 13 is the other end. May be set. In this case, the degree of deformation of the structural member 10 when an impact is applied to the closing plate 2 can be further reduced.
- FIG. 7A is a cross-sectional view showing a modification of the cross-sectional shape of the structural member 10 described above.
- a structural member 10 shown in FIG. 7A has a pair of side walls 11 and 12 having different shapes.
- the pair of side walls 11 and 12 have different angles with respect to the flanges 14 and 14 and heights HR and HL. Therefore, the positions in the height direction of the pair of flanges 14 and 14 are different.
- the position in the height direction of a position 11mid that is a half of the height HR of one side wall 11 and a position 12mid that is a half of the height HL of the other side wall 12 are different.
- the heights HR and HL and the center positions 11mid and 12mid in the height direction are defined separately for the pair of side walls 11 and 12, respectively.
- the high-strength portions 11A and 12A of the pair of side walls 11 and 12 are disposed at positions facing each other at least partially.
- the low-strength portions 11B and 12B of the pair of side walls 11 and 12 are also arranged at positions facing each other at least partially.
- the low strength portions 11B and 12B or the high strength portions 11A and 12A may be provided in a part of the side walls 11 and 12 in the height direction. For example, as shown in FIG.
- one side wall 11 of the pair of side walls 11 and 12 has a step.
- the height direction dimension from one end in contact with the top surface portion 13 side of the side wall 11 to the other end in contact with the flange 14 is defined as the height HR of the side wall 11. That is, the dimension from the lowest position of the side wall 11 to the highest position in the height direction is defined as the height HR of the side wall 11.
- the height direction is a direction perpendicular to the top surface portion 13.
- the distances h, ha, hb, and hc shown in FIGS. 6A to 6D are also set based on the distance in the height direction.
- the other side wall 12 of the pair of side walls 11 and 12 has an R (curved portion) formed at a portion connected to one end. That is, the portion connected to one end of the side wall 12 has a round and curved shape. Thereby, the surface of the boundary part (direction part) of the side wall 12 and the top surface part 13 becomes a curved surface.
- the height HL and the distance h of the side wall 12 are determined with the portion farthest from the position 12mid at the center in the height direction of the side wall 12 being the end of the side wall 12 among the portions where R is formed.
- At least one surface of the top surface portion 13, the side walls 11, 12, the flange 14, and the closing plate 2 may be a curved surface instead of a flat surface. That is, at least one of the top surface portion 13, the side walls 11, 12, the flange 14, and the closing plate 2 may be curved.
- the dimensions of the hat member 1 and the tubular portion of the closing plate 2 in the longitudinal direction are the same. Further, the positions of the end portions in the longitudinal direction of the hat member 1 and the closing plate 2 are aligned. In this case, the length in the longitudinal direction of the tubular portion is equal to the length in the longitudinal direction of the structural member 10.
- the dimension of the hat member 1 and the dimension of the closing plate 2 may be different in the longitudinal direction of the tubular portion.
- the position of the edge part of the longitudinal direction of the hat member 1 and the closing plate 2 does not need to align. That is, the length of the structural member 10 and the length of the tubular portion in the longitudinal direction of the tubular portion may be different.
- FIG. 7B is a cross-sectional view showing a modified example of the closing plate 2.
- the closing plate 2 has a shape protruding in a direction away from the hat member 1.
- the closing plate 2 includes a joint portion 2a joined to the flange 14 of the hat member 1 and an intermediate portion 2b between the joint portions.
- the intermediate portion 2b has a shape protruding in a direction away from the hat member 1.
- the cross-sectional shape of the closing plate 2 is a hat shape.
- the outer surface of the intermediate part 2b may be substantially parallel to the outer surface of the joint part 2a.
- the dimension in the height direction of the structural member 10 can be adjusted.
- the side wall height (H, HL, HR) as a reference for the arrangement of the low-strength portion and the high-strength portion does not vary depending on the dimension of the closing plate 2 in the height direction.
- FIGS. 7A and 7B a plurality of features such as the asymmetric shape of the hat member 1, the step, the R at the side wall end, and the shape of the closing plate 2 have been described.
- the structural member 10 that employs at least one of the plurality of features is also included in the embodiment of the present invention.
- FIG. 8 is a view for explaining the height direction of the side walls 11 and 12 when the top surface portion 13 is inclined.
- FIG. 8 is a diagram showing the height direction of the structural member 10 assumed to receive an impact on the top surface portion 13.
- the top surface portion 13 of the hat member 1 and the flanges 14 and 14 are not parallel.
- the length of the one side wall 11 and the other side wall 12 in the z direction is different.
- the height direction of the side walls 11 and 12 is set to a direction perpendicular to the top surface portion 13.
- the heights HL and HR of the side walls 11 and 11 are determined based on the height direction of the side walls 11 and 12.
- the direction perpendicular to the closing plate is the height direction of the side walls 11 and 12.
- FIGS. 9A and 9B are cross-sectional views showing modifications of the structural member in the present embodiment.
- 9A to 9C show cross-sectional shapes in a plane perpendicular to the longitudinal direction of the structural member.
- the example illustrated in FIGS. 9A and 9B is an example of the configuration 4 described above.
- the example illustrated in FIG. 9C is an example of the configuration 3 described above.
- FIG. 9D is a top view of the structural member shown in FIG. 9B as viewed from the z direction.
- a groove member that does not include a flange or a groove member that includes one flange is used instead of a hat member including two flanges.
- the first ridge line 123 and the second ridge line 124 at both ends of the side wall 11 are difficult to be deformed (bending rigidity) with respect to a load in a direction perpendicular to the top surface portion 13. It is a contributing structure.
- at least one of the two side walls has a structure in which the first ridge line and the joint at both ends of the side wall contribute to the bending rigidity.
- Each of the structural members 10g, 10h, and 10i shown in FIGS. 9A to 9C includes a groove-type groove member 31 and a closing plate 2 joined to the groove member 31.
- the groove member 31 shown in FIGS. 9A to 9C includes a top surface portion 13, two side walls 11 and 12 extending from both ends of the top surface portion 13, and two joint portions 3 r that join the groove member 13 and the closing plate 2. 3h.
- the two side walls 11 and 12 face each other.
- the two joint portions 3r and 3h are provided in a portion where a part of the groove member 31 and the closing plate 2 are overlapped.
- the joint portions 3r and 3h are, for example, spot weld portions or laser weld portions.
- the joint portion When the joint portion is discontinuously (intermittently) arranged in the extending direction of the first ridge line 123 of the groove member 31, the joint portion is considered to be at a position where the discontinuous joint portion is connected. That is, it is considered that there is a joint on a line connecting a plurality of joints intermittently arranged.
- a side wall is formed between the joint portion and the first ridge line.
- the plurality of joint portions 3h are arranged in the y direction (the extending direction of the first ridgeline 123).
- An imaginary line 300 in the y direction (the extending direction of the first ridgeline 123) connecting the plurality of joint portions becomes a joint line.
- the two side walls 11 and 12 include the first side wall 11 and the second side wall 12.
- the other end portion of the first side wall 11 opposite to the one end portion on the top surface portion 13 side is bent.
- a flange 14 extends from the bent portion.
- the flange 14 is overlapped with the closing plate 2.
- the flange 14 has a contact surface that contacts the closing plate 2.
- the flange 14 and the closing plate 2 are joined to each other at the joint 3r.
- the first side wall 11 is located between the first ridge line 123 of the two first ridge lines 123 and 123 and the flange 14. There is a second ridge 124 between the flange 14 and the first sidewall 11.
- the second ridge line 124 is an end portion of the flange 14.
- the second ridge line 124 extends in the same direction as the first ridge line 123, that is, in the longitudinal direction (y direction) of the groove member 31.
- the height HR of the first side wall 11 is the height of the first side wall 123 in the direction perpendicular to the top surface portion 13, that is, the direction perpendicular to the top surface portion 13 between the first ridge line 123 and the second ridge line 124. The distance at.
- the second side wall 12 is positioned between the other first ridge line 123 of the two first ridge lines 123 and 123 and the joint 3h.
- the second side wall 12 is not bent.
- a part of the second side wall 12 on the side of the joint 3 h is overlapped with the closing plate 2.
- a part of the second side wall 12 on the side of the joint 3 h has a contact surface 1 dh that contacts the closing plate 2.
- the second side wall 12 extends in the same direction as the contact surface 1dh.
- the height HL of the second side wall 12 is a distance between the first ridgeline 123 and the joint 3h in a direction perpendicular to the top surface portion 13.
- the two side walls 11 and 12 are positioned between the two first ridgelines 123 and 123 and the two joint portions 3r and 3h, respectively.
- the height HR of one of the two side walls 11 is a distance in a direction perpendicular to the top surface portion 13 between the first ridgeline 123 and the joint portion 3r.
- the height HL of the other side wall 12 of the two side walls is a distance in a direction perpendicular to the top surface portion 13 between the first ridgeline 123 and the joint portion 3h.
- the first side wall 11 has a height HR in the extending direction (y direction) of the first ridgeline 123 at a portion facing the second side wall 12. It includes a high-strength portion 11A formed over a distance of 2/3 times or more and 3 times or less.
- the low-strength portions 11B are arranged on both sides in the extending direction (y direction) of the first ridge line of the high-strength portions 11A.
- the second side wall 12 is formed in a portion facing the first side wall 11 in the extending direction (y direction) of the first ridgeline 123 over a distance of 2/3 times or more and 3 times or less HL.
- the strength portion 12A is included.
- the low strength portions 12B are disposed on both sides in the extending direction of the first ridgeline 123 of the high strength portion 12A (see, for example, FIG. 9D).
- the yield strength of the high strength portions 11A and 12A is 500 MPa or more.
- the yield strength of the low strength portions 11B and 12B is 60 to 85% of that of the high strength portions 11A and 12A.
- the high-strength portion and the low-strength portion in the groove-type member 31 can be configured in the same manner as any of the high-strength portion and the low-strength portion of the structural member 10 shown in FIGS.
- the first side wall 11 and the second side wall 12 are parallel to each other.
- the first side wall 11 and the second side wall 12 are not parallel to each other.
- the first side wall 11 and the second side wall 12 extend so that the distance from each other increases as the distance from the top surface portion 13 increases.
- the first side wall 11 extends in a direction perpendicular to the top surface portion 13.
- the second side wall 12 extends in a direction having an angle with respect to an axis perpendicular to the top surface portion 13.
- a flange 14 extends outward from the other end of the first side wall 11 on the closing plate 2 side.
- a structural member having a cross section as shown in FIG. 9A can be applied to an A-pillar, for example.
- the closing plate 2 has a bent portion that bends out of the plane.
- the extending direction (y direction) of the ridge line 2abh formed in the bent portion of the closing plate 2 is the extending direction of the boundary line between the contact surface 1dh that contacts the closing plate 2 and the surface that does not contact the closing plate 2 in the side wall 12. Is the same.
- the extending direction of the ridge line 2abh formed in the bent portion of the closing plate 2 may be the same as the extending direction of the first ridge line 123.
- the two side walls 11 and 12 are not bent. That is, the contact surface 1dr where the side wall 11 contacts the closing plate 2 extends in the same direction as the side wall 11. A contact surface 1dh where the side wall 12 contacts the closing plate 2 extends in the same direction as the side wall 12.
- the closing plate 2 includes two contact portions 2br and 2bh which are overlapped with and contacted with the groove member 31, and an intermediate portion 2a between the two contact portions 2br and 2bh.
- the intermediate portion 2a is bent between the two contact portions 2br and 2bh.
- the extending directions of the ridgelines 2abr and 2abh formed between the intermediate part 2a and the two contact parts 2br and 2bh are the contact surfaces 1dr and 1dh that are in contact with the closing plate 2 on the side walls 11 and 12, and the side walls 11 and 12, respectively. 12 is the same as the extending direction of the boundary line with the surface not contacting the closing plate 2.
- the same effect as that of the structural member 10 shown in FIGS. 2A to 2C can be obtained.
- the junction parts 3r and 3h are not restricted to a welding part.
- a fastener such as a screw, an adhesive, or an adhesive part such as brazing may be used as the joint part.
- the reference directions of the heights HR and HL of the side walls 11 and 12 are directions perpendicular to the top surface 13. In this case, the structural member is further prevented from being deformed when the top surface portion 13 receives an impact. Similar to the structural member 10 shown in FIGS.
- the strength and distribution of strength of the flange 14 are not particularly limited in the structural members 10g and 10h shown in FIGS. 9A to 9B. Further, in the structural members 10g, 10h, and 10i shown in FIGS. 9A to 9C, the portion closer to the end than the joint portion 3h of the groove member 31 is not particularly limited in terms of strength and strength distribution. This is because this portion corresponds to the flange 14, and the strength and the distribution of strength in this portion do not particularly affect the performance of the structural members 10g, 10h, and 10i.
- the structural member 10 is formed to extend linearly in the longitudinal direction.
- the structural member 10 may be curved.
- the structural member 10 may have a curved shape that is convex toward the top surface portion 13 side or the closing plate 2 side. That is, the structural member 10 may be curved so that the outer surface of the top surface portion 13 or the outer surface of the closing plate 2 is convex.
- FIGS. 10A to 10D are side views showing examples of the structural member 10 curved in the longitudinal direction.
- the structural member 10 is curved so as to be convex toward the top surface portion 13 side.
- the structural member 10 is curved with a constant curvature over the entire longitudinal direction.
- 10B and 10C the curvature changes according to the position in the longitudinal direction of the tubular portion of the structural member 10.
- the structural member 10 is curved in a part in the longitudinal direction.
- the structural member 10 is curved so as to be symmetric when viewed from the direction perpendicular to the side walls 11 and 12 (x direction).
- FIG. 10B, FIG. 10C, and FIG. 10D has a curved part (curved part) and a part (straight part) extended on a straight line.
- curved portions are arranged on both sides of the straight portion in the longitudinal direction. That is, a linear part is arrange
- straight portions are arranged on both sides in the longitudinal direction of the curved portion.
- a structural member formed by supporting both ends of the curved structural member 10 has high impact resistance against an impact in a direction facing the convex direction of the curve.
- the pair of low-strength portions 11B on the side wall 11 and the high-strength portion 11A therebetween are both arranged in the curved portion of the structural member 10.
- the pair of low-strength portions 11 ⁇ / b> B and the high-strength portion 11 ⁇ / b> A between them are disposed on the straight portion of the structural member 10.
- the high-strength portion 11A is arranged in the center of the straight portion.
- the high-strength portion 11A is arranged in a portion where the moment when receiving an impact is high, and high impact resistance is obtained.
- the structural member 10 when used as a vehicle structural member, the structural member 10 may be attached to the vehicle in a state in which the structural member 10 is supported by two connecting portions spaced apart in the longitudinal direction of the tubular portion.
- the structural member 10 is used as a structural member of a vehicle body, a bumper, or a vehicle door, for example. Therefore, a vehicle body, a bumper, or a vehicle door including the structural member 10 is also included in the embodiment of the present invention.
- two low strength portions 11B spaced apart in the longitudinal direction and a high strength portion 11A therebetween are disposed between the two connecting portions.
- the high-strength portion 12A and the low-strength portion 12B are arranged on the other side wall 12 facing the side walls 11 and 12 as well.
- the moment tends to increase when an impact is applied. Therefore, it is desirable to dispose the high-strength portions 11A and 12A at a portion (the center between the two connecting portions) at an equal distance from the two connecting portions. In addition, it is desirable to support both end portions of the structural member 10 in which the high-strength portions 11A and 12A are arranged at the center in the extending direction of the first ridgeline 123.
- the aspect which supports the part of the vicinity of the both ends of the structural member 10 is also included.
- the structural member 10 When attaching the structural member 10 to a vehicle, the structural member 10 is often arranged such that the longitudinal direction of the tubular portion of the structural member 10 follows the outer shape of the vehicle. That is, the structural member 10 is often attached to the vehicle so that the impact when the vehicle collides is in a direction perpendicular to the longitudinal direction of the structural member 10. Further, the structural member 10 may be attached to the vehicle such that the top surface portion 13 is disposed outside the vehicle and the closing plate 2 is disposed inside the vehicle. In this case, the high-strength portion 11A is disposed at the center between the connecting portions of the structural member 10, and the low-strength portions 11B are disposed on both sides thereof.
- the closing plate 2 may be disposed outside the vehicle.
- the high-strength portion 11A is disposed at the center between the connecting portions of the structural member 10, and the low-strength portions 11B are disposed on both sides thereof. Even when the closing plate 2 is disposed outside the vehicle, when the structural member 10 receives an impact from the outside of the vehicle, the degree to which the structural member 10 protrudes toward the inside of the vehicle is reduced.
- the structural member 10 may be curved as described above.
- the structural member 10 is attached to the vehicle so as to be convex toward the outside of the vehicle. Thereby, when the impact is received from the outer side of the vehicle, the structural member 10 can be made more difficult to break.
- the structural member 10 can be a structural member constituting a part of a vehicle body, a bumper, or a vehicle door.
- the structural member 10 can be used as a member constituting the vehicle body such as an A pillar, a B pillar, a side sill, a roof rail, a floor member, and a front side member.
- the structural member 10 can be used as a member that is attached to a vehicle body such as a door impact beam or a bumper, and protects a device or an occupant in the vehicle from an external impact.
- FIG. 11 is a diagram showing an example of a structural member arranged in a monocoque structure vehicle.
- the A pillar 15, B pillar 16, side sill 17, roof rail 18, bumper beam 19, front side member 20, door impact beam 21, floor member 22, and rear side member 23 are used as structural members for the vehicle. It is done.
- At least one of these structural members for a vehicle can be constituted by the structural member 10 described above.
- both ends of the structural member 10 are supported by the front side member 20.
- the moment of load is maximized.
- the high-strength portions 11A and 12A are disposed at the center in the longitudinal direction of the bumper beam 19, and the low-strength portions 11B and 12B are disposed on both sides thereof. Thereby, the bending deformation by the impact to the center of the bumper beam 19 is suppressed.
- brackets may be provided at both ends of the structural member 10.
- the structural member 10 may be attached to the door frame via brackets at both ends.
- the high-strength portions 11A and 12A are arranged at the center in the longitudinal direction of the structural member 10, that is, at the center of both ends that are the joint portions of the structural member 10 constituting the door impact beam 21, the high-strength portion 11A.
- 12A is arranged, it is possible to suppress the bending deformation at the portion where the moment when receiving an impact is greatest.
- the material of the structural member 10 constituting the structural member of the vehicle when an ultra-high strength steel having a tensile strength (tensile strength of portions other than the low strength portions 11B and 12B) of 780 MPa or more (yield strength of 400 Mpa or more) is used, The effect is noticeable. Furthermore, the effect of the region other than the low-strength portions 11B and 12B of the structural member 10 can be further improved by setting the tensile strength to 980 MPa or more (yield strength of 500 Mpa or more).
- the material of the structural member 10 is not limited to steel. For example, aluminum or another metal may be used as the material of the structural member 10.
- the vehicle to which the structural member 10 can be applied is not limited to a four-wheel vehicle such as the automobile shown in FIG.
- the structural member 10 may be used as a structural member for a two-wheeled vehicle.
- the structural member 10 can be applied not only to a monocoque structure vehicle but also to a frame structure vehicle body.
- the use of the structural member comprised by the structural member 10 is not restricted to the object for vehicles.
- the structural member 10 can be used as a structural member such as an impact resistant container, a building, a ship, or an aircraft.
- the aspect using the structural member 10 is not limited to the aspect in which both ends of the structural member 10 are connected to other members.
- Another member may be connected at any two positions separated by 6H or more in the extending direction of the first ridgeline 123 of the structural member 10. That is, the two connecting portions may be arranged at any position of the structural member 10 without being limited to both ends.
- the structural member 10 may be entirely formed of the same material.
- the structural member 10 is formed from, for example, a steel plate.
- the manufacturing process of the structural member 10 includes a step of manufacturing the hat member 1 having the low strength portions 11B and 12B and the high strength portions 11A and 12A, a step of manufacturing the closing plate 2, and the hat member 1 and the closing plate 2. Joining.
- the manufacturing process of the hat member 1 includes a process of giving a strength difference to the material and forming a low strength region.
- the process of bending the hat member 1 and the closing plate 2 may be included in the manufacturing process.
- a bending method such as press bending, tensile bending, compression bending, roll bending, push-through bending, or eccentric plug bending is used.
- the manufacturing process of the structural member 10 includes a process of forming a low strength portion in the material.
- the method for forming the low-strength portion is not particularly limited.
- the steel sheet is deformed into a cross-sectional hat shape by roll forming, and the material is locally heated and quenched by a method such as laser or high-frequency heating.
- the hat member 1 including the cured region can be created.
- a region where no quenching is performed becomes a low strength portion having a relatively low strength.
- the annealing process may be partially performed to form the low-strength portion.
- the structural member 10 can be manufactured using a hot press (hot stamping) technique.
- the hot pressing step the low strength region can be formed in the material by partially changing the heating or cooling conditions in the same material. For example, using a steel plate, the steel is heated to a temperature at which the steel becomes an austenite single phase region (Ac3 temperature) or higher, and quenching is performed while forming using a mold. At this time, by making a difference in the cooling rate, the quenching portion is made into a generally hard martensite structure, and the slow cooling portion is made into a mixed phase structure of soft ferrite and pearlite or a bainite structure. Thereby, a slow cooling part can be made into a low intensity
- the manufacturing method of the structural member 10 is not restricted to the said example.
- the yield strength distribution of the high strength portions 11A and 12A may not be uniform. In the steady region, the variation in yield strength is often within ⁇ 10%.
- SA reference strength
- a region (transition region) having a yield strength greater than 0.85 SA and less than 0.9 SA (85% to 90% of SA) is regarded as a part of the high strength portions 11A and 12A.
- the yield strength in the high-strength portions 11A and 12A is greater than 0.85 SA (85% of SA). That is, the regions where the yield strength is greater than 0.85 SA are the high strength portions 11A and 12A.
- FIG. 12 is a diagram showing an example of the distribution of the yield strength of the portion including the boundary between the low strength portions 11B and 12B and the high strength portions 11A and 12A.
- the vertical axis indicates the yield strength
- the horizontal axis indicates the position in the y direction.
- 90% (0.9Smax) of the maximum value Smax of the yield strength of the high strength portion is defined as the yield strength SA of the high strength portion.
- a region where the yield strength is 0.9 SA or more is called a steady region.
- the region where the yield strength is larger than 0.85 SA and smaller than 0.9 SA is a transition region from the low strength portion to the steady region of the high strength portion.
- the transition region is regarded as a high-strength part, and the position where the yield strength is 0.85 A is the boundary between the low-strength part and the high-strength part. That is, a region where the yield strength is greater than 0.85 SA is a high strength portion, and a region where the yield strength is 0.85 SA or less is a low strength portion.
- the yield strength of the low strength part is 0.6 SA or more and 0.85 SA or less (60 to 85% of SA). Even if the portion surrounded by the low strength portion of the structural member 10 includes a portion of 0.6 SA or less, if the portion is small enough to ignore the influence on the deformation behavior of the structural member 10, the strength is low. It can be regarded as a part of the parts 11B and 12B.
- FIG. 13A is a diagram illustrating a configuration of an analysis model in simulation. In this simulation, the deformation behavior when the indenter (impactor) 4 collides with the central portion in the longitudinal direction of the structural member 100 in a state where the structural member 100 is stretched over the two platforms 33 was analyzed.
- FIG. 13B is a diagram showing a configuration of the structural member 100 shown in FIG. 13A as viewed from the y direction.
- the structural member 100 includes a hat member 101 and a closing plate 102.
- the hat member 101 includes a top surface 113, a pair of side walls 111 and 112 extending from both ends of the top surface 113 and facing each other, and a flange 114 extending outward in the opposite direction from an end opposite to the top surface 113 of the side walls 111 and 112. including.
- the closing plate 102 is joined to the flange 114.
- FIGS. 13A and 13B a simulation was performed when the indenter 4 moved in the z direction and collided with the top surface portion 113 and when the indenter 4 moved in the z direction and collided with the closing plate 102. .
- the mass of the indenter 4 was 350 kg, the width WI in the Y direction of the indenter 4 was 160 mm, the radius of curvature R of the collision surface 4s of the indenter 4 was 150 mm, and the initial speed of the indenter 4 was 4 m / sec.
- the friction coefficient was set to 0.1.
- the width W2 of the top surface portion was 50 mm, and the height H of each of the pair of side surfaces 111 and 112 was 50 mm.
- the thickness t of the structural member 100 is 1.4 mm
- the R of the structural member 100 is 5 mm
- the length LY in the extending direction (y direction) of the first ridge line that is the boundary between the side wall 111 and the top surface portion 113 of the structural member 100 is It was set to 1000 mm.
- the distance LS between the tables 3 was 400 mm.
- the high-strength portion 10A is disposed on the pair of side walls 111 and 112, and the low-strength portions 10B are disposed on both sides in the y direction of the high-strength portion 10A.
- the high-strength portion 10 ⁇ / b> A was disposed at the center in the length direction of the structural member 10.
- the indenter 4 collides with the top surface portion 113.
- the length LY in the y direction of the structural member 100 is at least six times the height H of the side walls 111 and 112 (LY ⁇ 6H).
- FIG. 13C is a diagram showing another configuration of the analysis model in the simulation.
- both ends of the structural member 100 are joined to the two platforms 33.
- the simulation result of the analysis model shown in FIG. 13C was the same as the simulation result of the analysis model shown in FIG. 13A.
- a simulation of causing the indenter 4 to collide with the closing plate 102 was also performed.
- the yield strength of the low strength portion 10B is 100 kgf / mm 2
- the yield strength of other regions including the high strength portion 10A is 120 kgf / mm 2 (the strength ratio of the low strength portion 10B to the high strength portion 10A is about 0.83).
- the collision simulation was performed by changing the dimension LA of the high-strength portion 10A and the dimension LB of the low-strength portion 10B.
- Table 1 below shows that the strength ratio is 0.83 (the yield strength of the low-strength portion 10B is YP100 kgf / mm 2 , and the yield strength of other portions including the high-strength portion 10A is YP120 kgf / mm 2 ).
- board thickness t of the structural member 100 is shown.
- Excellent in the deformation behavior column is very good, Good is good, Poor is poor. These deformation behaviors were evaluated based on the amount of indenter penetration. Poor means it broke in the early stages of deformation. In addition, the meaning of evaluation of Excellent, Good, Poor is the same also in Table 5 shown later.
- the intrusion amount of the indenter is also referred to as an impactor stroke or an indenter displacement.
- Table 1 below shows analysis results when the indenter 4 is caused to collide with the top surface portion 113. On the other hand, when the indenter 4 was made to collide with the closing plate 102, an analysis result substantially similar to Table 1 below was obtained.
- FIG. 14 is a diagram showing a simulation result of deformation of the structural member 10 when the intrusion amount of the indenter 4 is 40 mm.
- FIG. 14 shows the deformation of the structural member 100 for Cases 1 to 3, 5, and 7 to 9 shown in Table 1. From the results shown in FIG. 14, Cases 2, 3, 5, and 7, that is, in the case of 2H / 3 ⁇ LA ⁇ 3H, the range of the portion deformed by impact becomes wider than in the other Cases 1, 8, and 9. Yes. That is, in the case of Cases 1, 8, and 9, a deformation mode of “folding” in which the bent portion is bent so as to protrude sharply occurred. In Cases 2, 3, 5, and 7, a deformation mode of “cross-sectional collapse” in which a part of the top surface portion and the side wall subjected to the impact was crushed by the impact occurred.
- FIG. 15A is a graph showing a simulation result of the impactor stroke at the time of bending in Cases 1 to 12 in Table 1.
- FIG. 15A shows a simulation result when the indenter 4 collides with the top surface portion 113.
- FIG. 15B is a simulation result when the indenter 4 collides with the closing plate 102.
- the conditions of dimension LA and thickness t of Cases 1 to 12 in FIG. 15B are the same as the conditions of dimension LA and thickness t of Cases 1 to 12 shown in Table 1.
- the impactor stroke (FIG. 15B) when an impact is applied to the closing plate 102 is larger than the impactor stroke (FIG. 15A) when an impact is applied to the top surface portion 113.
- the flange 114 is on the bending inner side (folding start side) of the structural member 100, compared to the case of FIG. 15A, the rigidity reduction due to bending deformation of the structural member 100 is suppressed. .
- FIG. 16 is a graph showing the amount of deformation due to bending deformation when an impact load is input by changing the strength ratio of the low strength portion 10B and other portions including the high strength portion 10A.
- the vertical axis indicates the amount of penetration (projection amount) of the structural member 10 in the impact direction (z direction).
- the rhombus plot shows the results when the yield strength of the high strength portion is YS120 kgf / mm 2
- the square plot shows the results when the yield strength of the high strength portion is 145 kgf / mm 2. Results are shown.
- the intrusion amount decreases as the intensity ratio increases (arrow Y1).
- the deformation mode of the structural member 10 is crushed in cross section.
- the intensity ratio exceeded 0.85, the amount of penetration increased rapidly (arrow Y2).
- the intensity ratio was increased at an intensity ratio of 0.85 or more, the amount of penetration increased with increasing intensity ratio (arrow Y3). This is presumably because the deformation mode changed from cross-sectional crushing to folding at the intensity ratio of 0.85.
- the strength ratio is preferably 60 to 85% and the strength ratio is more preferably 70 to 85% from the viewpoint of reducing the amount of bending deformation intrusion due to impact.
- Table 2 below shows the deformation behavior obtained from the simulation results when the low-strength portion 10B is provided in a part of the side wall in the height direction of the side wall as shown in FIG. 6A.
- the distance h from the top surface portion in the height direction of the side wall to the low strength portion 10B was changed stepwise, and the indenter 4 was made to collide with the top surface portion 113 for the distance h at each step.
- Table 2 when the distance h from the top surface portion to the low strength portion 10B in the height direction of the side wall is 0 and H / 5, the deformation behavior becomes very good, and the distance h is Deformation behavior was good at H / 4.
- the high-strength portion 10A is provided from the flange to the position ha in the height direction of the side wall, and the low-strength portion is provided from the high-strength portion 10A to the top surface portion.
- Deformation behavior obtained from simulation results is shown.
- the dimension LB in the extending direction of the first ridge line of the low-strength portion 10B is set. (3/5) H.
- the distance ha in the height direction of the side wall of the high-strength portion 10A was changed stepwise, and the indenter 4 was made to collide with the top surface portion 113 for each step distance ha.
- Table 3 the deformation behavior was very good when the distance ha was 4H / 5 or more, and the deformation behavior was good when the distance ha was 3H / 5.
- Table 4 below shows the deformation behavior obtained from the simulation results when the low-strength portion 10B is provided in a part of the side wall in the height direction of the side wall as shown in FIG. 6B.
- the low-strength portion 10B was provided in contact with the top surface portion.
- the distance hb from the flange to the low-strength portion 10B was changed stepwise, and the indenter 4 was made to collide with the top surface portion 113 for each step distance hb.
- Table 4 when the distance hb from the flange in the height direction of the side wall to the low strength portion 10B is H / 7, H / 5, and H / 2, the deformation behavior becomes very good, The deformation behavior was good when the distance hb was 4H / 5.
- Table 5 shows the analysis result of the deformation behavior of the structural member when the dimension LB in the extending direction of the first ridge line of the low-strength portion 10B is changed in the simulation using the model shown in FIG. 13C.
- the graph shown in FIG. 17 is a graph showing the final impactor intrusion amount in each of Cases 13 to 16 in Table 5 above.
- the intrusion amount of the impactor is small.
- the protrusion degree can be further reduced by setting LB ⁇ (3/5) H.
- Structural member 2 Closing plate 11, 12: Side wall 13: Top surface portion 14: Flange 11A, 12A: High strength portion 11B, 12B: Low strength portion
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Abstract
Description
本発明の実施形態における構造1の構造部材は、少なくとも1枚のクロージングプレートと、ハット部材とを備える。前記ハット部材は、頂面部と、前記頂面部の両端部にある2つの第1の稜線と、それぞれが前記クロージングプレートに接合された2つのフランジと、前記2つのフランジの端部にある2つの第2の稜線と、前記2つの第1の稜線と前記2つの第2の稜線の間に、それぞれ位置する2つの側壁とを有する。前記ハット部材と前記クロージングプレートにより形成される管状部の前記第1の稜線の延在方向の長さは、前記頂面部に垂直な方向における前記2つ側壁の長さのうち長い方の長さHの6倍以上である。前記2つの側壁のそれぞれは、高強度部と低強度部を含む。前記高強度部は、前記2つの側壁の対向する部分に、前記第1の稜線の延在方向に、前記Hの2/3倍以上3倍以下の距離にわたって形成される。前記高強度部の降伏強度は、500MPa以上である。前記低強度部は、前記高強度部の前記第1の稜線の延在方向の両側に配置される。前記低強度部の降伏強度は、前記高強度部の60~85%である。
本発明の実施形態における構造2の構造部材は、少なくとも1枚のクロージングプレートと、ハット部材とを備える。前記ハット部材は、頂面部と、前記頂面部の両端部にある2つの第1の稜線と、それぞれが前記クロージングプレートに接合された2つのフランジと、前記2つのフランジの端部にある2つの第2の稜線と、前記2つの第1の稜線と前記2つの第2の稜線の間に、それぞれ位置する2つの側壁とを有する。前記ハット部材と前記クロージングプレートにより形成される管状部の前記第1の稜線の延在方向の長さは、前記クロージングプレートに垂直な方向における前記2つ側壁の長さのうち長い方の長さHの6倍以上である。前記2つの側壁のそれぞれは、高強度部と低強度部を含む。前記高強度部は、前記2つの側壁の対向する部分に、前記第1の稜線の延在方向に、前記Hの2/3倍以上3倍以下の距離にわたって形成される。前記高強度部の降伏強度は500MPa以上である。前記低強度部は、前記高強度部の前記第1の稜線の延在方向の両側に配置される。前記低強度部の降伏強度は前記高強度部の60~85%である。
本発明の実施形態における構造3の構造部材は、少なくとも1枚のクロージングプレートと、溝型部材とを備える。前記溝型部材は、頂面部と、前記頂面部の両端部にある2つの第1の稜線と、それぞれが前記クロージングプレートに接合される2つの接合部と、前記2つの第1の稜線と前記2つの接合部との間に、それぞれ位置する2つの側壁とを有する。前記溝型部材と前記クロージングプレートにより形成される管状部の前記第1の稜線の延在方向の長さは、前記頂面部に垂直な方向における、前記各側壁の長さのうち長い方の長さHの6倍以上である。前記2つの側壁のそれぞれは、高強度部と低強度部を含む。前記高強度部は、前記2つの側壁の対向する部分に、前記第1の稜線の延在方向に、前記長さHの2/3倍以上3倍以下の距離にわたって形成される。前記高強度部の降伏強度は500MPa以上である、前記低強度部は、前記高強度部の前記第1の稜線の延在方向の両側に配置される。前記低強度部の降伏強度は、前記高強度部の60~85%である。
本発明の実施形態における構造4の構造部材は、少なくとも1枚のクロージングプレートと、溝型部材とを備える。前記溝型部材は、1つの頂面部と、前記頂面部の両端部にある2つの第1の稜線と、前記クロージングプレートに接合されたフランジと、前記フランジの端部にある1つの第2の稜線と、前記第1の稜線と前記第2の稜線の間にある第1の側壁と、前記クロージングプレートに接合される接合部と、前記第1の稜線と前記接合部との間にある第2の側壁とを備える。前記溝型部材と前記クロージングプレートにより形成される管状部の前記第1の稜線の延在方向の長さは、前記頂面部に垂直な方向における前記第1の側壁の長さ又は前記第2の側壁の長さのうち長い方の長さHの6倍以上である。前記第1の側壁は、高強度部と低強度部を含む。前記第1の側壁の前記高強度部は、前記第2の側壁と対向する部分に、前記管状部の前記第1の稜線の延在方向に、前記Hの2/3倍以上3倍以下の距離にわたって形成される。前記高強度部の降伏強度は500MPa以上である。前記低強度部は、前記高強度部の前記第1の稜線の延在方向の両側に配置される。前記低強度部の降伏強度は、前記高強度部の60~85%である。前記第2の側壁は、高強度部と低強度部を含む。前記第2の側壁の前記高強度部は、前記第1の側壁と対向する部分に、前記管状部の前記第1の稜線の延在方向に、前記長さHの2/3倍以上3倍以下の距離にわたって形成される。前記高強度部の降伏強度は500MPa以上である。前記低強度部は。前記高強度部の前記第1の稜線の延在方向の両側に配置される。前記低強度部の降伏強度は、前記高強度部の60~85%である。
次に構造5について説明する。上記構造1~4のいずれかにおいて、前記低強度部の前記第1の稜線の延在方向における長さは、前記長さHの3/5倍以上且つ2倍以下であることが好ましい。これにより、さらに、高強度部への衝撃による構造部材の変形度合いをより抑えることができる。
次に構造6について説明する。上記構造1~5のいずれかにおいて、前記低強度部の間の前記高強度部は前記管状部における第1の稜線の延在方向の中央に配置されることが好ましい。前記管状部の第1の稜線の延在方向の中央は、衝撃によるモーメントが大きくなりやすい。構造5のように、第1の稜線の延在方向の中央に高強度部を配置し、その両側に低強度を配置することで、衝撃による構造部材の変形を効率良く抑えることができる。
次に構造7について説明する。上記構造1、3及び4のいずれかにおいて、前記側壁の前記第1の稜線側の一方端と前記第1の稜線と反対側の他方端の間において、前記側壁の前記一方端から前記他方端に向かって、前記側壁の前記一方端から前記他方端まで長さの1/4の位置までの間の領域に、前記低強度部の前記一方端側の端部があってもよい。
次に構造8について説明する。上記構造7において、前記側壁の他方端から前記一方端に向かって、前記側壁の前記一方端と前記他方端の間の長さの(4/5)の位置まで領域に、前記低強度部の前記他方端側の端部が位置してもよい。この場合、前記低強度部の前記一方端から前記他方端に向かう方向の長さは、前記側壁の前記一方端と前記他方端の間の長さの1/5以上である。
次に構造9について説明する。上記構造7又は8において、前記側壁の前記一方端と前記他方端の間にある前記低強度部の端部に隣接し、前記低強度部より降伏応力が高い領域を含んでもよい。
次に構造10について説明する。上記構造1、3及び4のいずれかにおいて、前記側壁の前記第1の稜線側の一方端と前記第1の稜線と反対側の他方端の間において、前記一方端から前記他方端に向かって、前記側壁の前記一方端と前記他方端の間の長さの(2/5)の位置の間の領域に、前記低強度部の間にある前記高強度部の前記一方端側の端部が位置してもよい。この場合、前記側壁の前記他方端に、前記高強度部の他方端側の端部が位置する。前記高強度部の前記一方端側の端部から前記側壁の一方端までの間にわたって、降伏強度が前記高強度部の60~85%の追加低強度部が設けられる。
次に構造11について説明する。上記構造2において、前記側壁の前記第1の稜線側と反対側の一方端と前記第1の稜線側の他方端の間において、前記側壁の前記一方端から前記他方端に向かって、前記側壁の前記一方端と前記他方端の間の長さの1/4の位置までの間の領域に、前記低強度部の前記一方端側の端部があってもよい。
次に構造12について説明する。上記構造11において、前記側壁の他方端から前記一方端に向かって、前記側壁の前記一方端から前記他方端までの長さの(4/5)の位置までの間の領域に、前記低強度部の前記他方端側の端部が位置してもよい。この場合、前記低強度部の前記一方端から前記他方端に向かう方向の長さは、前記側壁の前記一方端と前記他方端の間の長さの1/5以上である。
次に構造13について説明する。上記構造11又は12において、前記側壁の前記一方端と前記他方端の間にある前記低強度部の端部に隣接し、前記低強度部より降伏応力が高い領域を含んでもよい。
次に構造14について説明する。上記構造2において、前記側壁の前記第1の稜線と反対側の一方端と前記第1の稜線側の他方端の間において、前記一方端から前記他方端に向かって、前記側壁の前記一方端から前記他方端までの間の長さの(2/5)の位置の間の領域に、前記低強度部の間にある前記高強度部の前記一方端側の端部が位置してもよい。この場合、前記側壁の前記他方端に、前記高強度部の他方端側の端部が位置する。前記高強度部の前記一方端側の端部から前記側壁の一方端までの間にわたって、降伏強度が前記高強度部の60~85%の追加低強度部が設けられる。
次に構造15について説明する。上記構造1、3、4、7~10のいずれかにおいて、構造部材は、前記頂面部側に凸となるよう湾曲することが好ましい。これにより、頂面部への衝撃に対して構造部材が変形しにくくなる。
次に構造16について説明する。上記構造2、11~14のいずれかにおいて、構造部材は、前記クロージングプレート側に凸となるよう湾曲することが好ましい。これにより、クロージングプレートへの衝撃に対して構造部材が変形しにくくなる。
次に構造17について説明する。上記構造1~16のいずれかにおいて、前記第1の稜線の延在方向に垂直な面の断面において、前記クロージングプレートが前記ハット部材又は前記溝型部材と接合される部分を結ぶ仮想線分の少なくとも一部は、前記頂面部と前記クロージングプレートの間にある態様としてもよい。構造17では、前記クロージングプレートは、前記ハット部材又は前記溝型部材に重ねられる一対の重ね合わせ部及び前記一対の重ね合わせ部の間の中間部を含む。この中間部は、前記重ね合わせ部に対して前記ハット部材又は前記溝型部材から離れる方向へ突出して形成される。
次に構造18について説明する。構造18の構造部材は、上記構造1~17のいずれかの構造部材を車両に取り付けたものである。この場合、前記頂面部又は前記クロージングプレートは、前記第1の稜線の延在方向において6H以上離れた2箇所に設けられる2つの連結部であって、他の部材に連結される2つの連結部を含む。
次に、構造19について説明する。上記構造18において、前記高強度部は、前記2つの連結部の間の中央に配置されることが好ましい。これにより、衝撃による構造部材の変形を効率良く抑えることができる。
図2Aは、本実施形態における構造部材10の構成を示す斜視図である。図2Bは、図2Aに示す構造部材10を長手方向(y方向)から見た側面図である。図2Cは、図2Aに示す構造部材10を長手方向に垂直な方向(x方向)から見た側面図である。
上述したように、構造部材10を車両用構造部材として用いる場合、構造部材10を、管状部の長手方向に離間した2つの連結部で支持した状態で車両に取り付けられることがある。構造部材10は、例えば、車体、バンパ又は車両ドアの構造部材として使用される。そのため、構造部材10を備える車体、バンパ又は車両ドアも、本発明の実施形態に含まれる。
構造部材10は、全体を同一素材で形成してもよい。構造部材10は、例えば、鋼板から形成される。構造部材10の製造工程には、低強度部11B、12B及び高強度部11A、12Aを有するハット部材1を作製する工程と、クロージングプレート2を作製する工程と、ハット部材1とクロージングプレート2を接合する工程とが含まれる。ハット部材1の作製工程では、素材に強度差を与え、低強度領域を形成する工程が含まれる。また、ハット部材1及びクロージングプレート2を湾曲させる工程が製造工程に含まれてもよい。ハット部材1及びクロージングプレート2を湾曲させる場合は、例えば、プレス曲げ、引張り曲げ、圧縮曲げ、ロール曲げ、押し通し曲げ、又は偏心プラグ曲げ等の曲げ加工方法が用いられる。
2:クロージングプレート
11、12:側壁
13:頂面部
14:フランジ
11A、12A:高強度部
11B、12B:低強度部
Claims (19)
- 少なくとも1枚のクロージングプレートと、ハット部材とを備える構造部材であって、
前記ハット部材は、
頂面部と、
前記頂面部の両端部にある2つの第1の稜線と、
それぞれが前記クロージングプレートに接合された2つのフランジと、
前記2つのフランジの端部にある2つの第2の稜線と、
前記2つの第1の稜線と前記2つの第2の稜線の間に、それぞれ位置する2つの側壁とを有し、
前記ハット部材と前記クロージングプレートにより形成される管状部の前記第1の稜線の延在方向の長さは、前記頂面部に垂直な方向における前記2つ側壁の長さのうち長い方の長さHの6倍以上であり、
前記2つの側壁のそれぞれは、前記2つの側壁の対向する部分に、前記第1の稜線の延在方向に、前記長さHの2/3倍以上3倍以下の距離にわたって形成され、降伏強度が500MPa以上である高強度部と、前記高強度部の前記第1の稜線の延在方向の両側に配置され、降伏強度が前記高強度部の60~85%である低強度部と、を含む、
構造部材。 - 少なくとも1枚のクロージングプレートと、ハット部材とを備える構造部材であって、
前記ハット部材は、
頂面部と、
前記頂面部の両端部にある2つの第1の稜線と、
それぞれが前記クロージングプレートに接合された2つのフランジと、
前記2つのフランジの端部にある2つの第2の稜線と、
前記2つの第1の稜線と前記2つの第2の稜線の間に、それぞれ位置する2つの側壁とを有し、
前記ハット部材と前記クロージングプレートにより形成される管状部の前記第1の稜線の延在方向の長さは、前記クロージングプレートに垂直な方向における前記2つ側壁の長さのうち長い方の長さHの6倍以上であり、
前記2つの側壁のそれぞれは、前記2つの側壁の対向する部分に、前記第1の稜線の延在方向に、前記長さHの2/3倍以上3倍以下の距離にわたって形成され、降伏強度が500MPa以上である高強度部と、前記高強度部の前記第1の稜線の延在方向の両側に配置され、降伏強度が前記高強度部の60~85%である低強度部と、を含む、
構造部材。 - 少なくとも1枚のクロージングプレートと、溝型部材とを備える構造部材であって、
前記溝型部材は、
頂面部と、
前記頂面部の両端部にある2つの第1の稜線と、
それぞれが前記クロージングプレートに接合される2つの接合部と、
前記2つの第1の稜線と前記2つの接合部との間に、それぞれ位置する2つの側壁とを有し、
前記溝型部材と前記クロージングプレートにより形成される管状部の前記第1の稜線の延在方向の長さは、前記頂面部に垂直な方向における、前記各側壁の長さのうち長い方の長さHの6倍以上であり、
前記2つの側壁のそれぞれは、前記2つの側壁の対向する部分に、前記第1の稜線の延在方向に、前記長さHの2/3倍以上3倍以下の距離にわたって形成され、降伏強度が500MPa以上である高強度部と、前記高強度部の前記第1の稜線の延在方向の両側に配置され、降伏強度が前記高強度部の60~85%である低強度部と、を含む、
構造部材。 - 少なくとも1枚のクロージングプレートと、溝型部材とを備える構造部材であって、
前記溝型部材は、
1つの頂面部と、
前記頂面部の両端部にある2つの第1の稜線と、
前記クロージングプレートに接合されたフランジと、
前記フランジの端部にある1つの第2の稜線と、
前記第1の稜線と前記第2の稜線の間にある第1の側壁と、
前記クロージングプレートに接合される接合部と、
前記第1の稜線と前記接合部との間にある第2の側壁と、
を備え、
前記溝型部材と前記クロージングプレートにより形成される管状部の前記第1の稜線の延在方向の長さは、前記頂面部に垂直な方向における前記第1の側壁の長さ又は前記第2の側壁の長さのうち長い方の長さHの6倍以上であり、
前記第1の側壁は、前記第2の側壁と対向する部分に、前記管状部の前記第1の稜線の延在方向に、前記長さHの2/3倍以上3倍以下の距離にわたって形成され、降伏強度が500MPa以上である高強度部と、前記高強度部の前記第1の稜線の延在方向の両側に配置され、降伏強度が前記高強度部の60~85%である低強度部を含み、
前記第2の側壁は、前記第1の側壁と対向する部分に、前記管状部の前記第1の稜線の延在方向に、前記長さHの2/3倍以上3倍以下の距離にわたって形成され、降伏強度が500MPa以上である高強度部と、前記高強度部の前記第1の稜線の延在方向の両側に配置され、降伏強度が前記高強度部の60~85%である低強度部とを含む、
構造部材。 - 前記低強度部の前記第1の稜線の延在方向における長さは、前記長さHの3/5倍以上且つ2倍以下である請求項1~4のいずれか1項に記載の構造部材。
- 前記低強度部の間の前記高強度部は前記管状部における第1の稜線の延在方向の中央に配置される請求項1~5のいずれか1項に記載の構造部材。
- 前記側壁の前記第1の稜線側の一方端と前記第1の稜線と反対側の他方端の間において、前記側壁の前記一方端から前記他方端に向かって、前記側壁の前記一方端から前記他方端まで長さの1/4の位置までの間の領域に、前記低強度部の前記一方端側の端部がある、請求項1、3及び4のいずれか1項に記載の構造部材。
- 前記側壁の他方端から前記一方端に向かって、前記側壁の前記一方端と前記他方端の間の長さの(4/5)の位置まで領域に、前記低強度部の前記他方端側の端部が位置し、
前記低強度部の前記一方端から前記他方端に向かう方向の長さは、前記側壁の前記一方端と前記他方端の間の長さの1/5以上である、請求項7に記載の構造部材。 - 前記側壁の前記一方端と前記他方端の間にある前記低強度部の端部に隣接し、前記低強度部より降伏応力が高い領域を含む、請求項7又は8に記載の構造部材。
- 前記側壁の前記第1の稜線側の一方端と前記第1の稜線と反対側の他方端の間において、前記一方端から前記他方端に向かって、前記側壁の前記一方端と前記他方端の間の長さの(2/5)の位置の間の領域に、前記低強度部の間にある前記高強度部の前記一方端側の端部が位置し、前記側壁の前記他方端に、前記高強度部の他方端側の端部が位置し、前記高強度部の前記一方端側の端部から前記側壁の一方端までの間にわたって、降伏強度が前記高強度部の60~85%の追加低強度部が設けられる、請求項1、3及び4のいずれか1項に記載の構造部材。
- 前記側壁の前記第1の稜線側と反対側の一方端と前記第1の稜線側の他方端の間において、前記側壁の前記一方端から前記他方端に向かって、前記側壁の前記一方端と前記他方端の間の長さの1/4の位置までの間の領域に、前記低強度部の前記一方端側の端部がある、請求項2に記載の構造部材。
- 前記側壁の他方端から前記一方端に向かって、前記側壁の前記一方端と前記他方端の間の長さの(4/5)の位置まで領域に、前記低強度部の前記他方端側の端部が位置し、
前記低強度部前記一方端から前記他方端に向かう方向の長さは、前記側壁の前記一方端と前記他方端の間の長さの1/5以上である、請求項11に記載の構造部材。 - 前記側壁の前記一方端と前記他方端の間にある前記低強度部の端部に隣接し、前記低強度部より降伏応力が高い領域を含む、請求項11又は12に記載の構造部材。
- 前記側壁の前記第1の稜線と反対側の一方端と前記第1の稜線側の他方端の間において、前記一方端から前記他方端に向かって、前記側壁の前記一方端と前記他方端の間の長さの(2/5)の位置の間の領域に、前記低強度部の間にある前記高強度部の前記一方端側の端部が位置し、前記側壁の前記他方端に、前記高強度部の他方端側の端部が位置し、前記高強度部の前記一方端側の端部から前記側壁の一方端までの間にわたって、降伏強度が前記高強度部の60~85%の追加低強度部が設けられる、請求項2に記載の構造部材。
- 前記頂面部側に凸となるよう湾曲した請求項1、3、4、7~10のいずれか1項に記載の構造部材。
- 前記クロージングプレート側に凸となるよう湾曲した請求項2、11~14のいずれか1項に記載の構造部材。
- 前記第1の稜線の延在方向に垂直な面の断面において、前記クロージングプレートが前記ハット部材又は前記溝型部材と接合される部分を結ぶ仮想線分の少なくとも一部は、前記頂面部と前記クロージングプレートの間にある、請求項1~16のいずれか1項に記載の構造部材。
- 車両に取り付けられる請求項1~17にいずれか1項に記載の構造部材であって、
前記頂面部又は前記クロージングプレートは、前記第1の稜線の延在方向において6H以上離れた2箇所に設けられる2つの連結部であって、他の部材に連結される2つの連結部を含む、車両用の構造部材。 - 前記高強度部は、前記2つの連結部の間の中央に配置される、請求項18に記載の構造部材。
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JP2018561330A JP6743913B2 (ja) | 2017-01-11 | 2017-12-28 | 構造部材及び車両用構造部材 |
CA3049752A CA3049752A1 (en) | 2017-01-11 | 2017-12-28 | Structural member and structural member for vehicle |
US16/467,589 US11260908B2 (en) | 2017-01-11 | 2017-12-28 | Structural member and structural member for vehicle |
CN201780082915.3A CN110191838B (zh) | 2017-01-11 | 2017-12-28 | 构造构件和车辆用构造构件 |
EP17891080.8A EP3569482B1 (en) | 2017-01-11 | 2017-12-28 | Structural member and vehicle structural member |
MX2019008136A MX2019008136A (es) | 2017-01-11 | 2017-12-28 | Miembro estructural y miembro estructural para vehiculo. |
BR112019010689A BR112019010689A2 (pt) | 2017-01-11 | 2017-12-28 | elemento estrutural e elemento estrutural para veículos |
KR1020197019914A KR102236841B1 (ko) | 2017-01-11 | 2017-12-28 | 구조 부재 및 차량용 구조 부재 |
RU2019121563A RU2719114C1 (ru) | 2017-01-11 | 2017-12-28 | Конструктивный элемент для транспортного средства (варианты) |
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EP (1) | EP3569482B1 (ja) |
JP (1) | JP6743913B2 (ja) |
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CA (1) | CA3049752A1 (ja) |
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DE102016107048B4 (de) * | 2016-04-15 | 2021-06-24 | Saf-Holland Gmbh | Rahmeneinheit |
US11279408B2 (en) * | 2017-09-01 | 2022-03-22 | Nippon Steel Corporation | Hollow member |
DE102018129724B4 (de) * | 2018-11-26 | 2022-08-04 | Benteler Automobiltechnik Gmbh | Fahrzeugbauteil für ein Fahrzeug |
CN115087586A (zh) * | 2020-05-14 | 2022-09-20 | 日本制铁株式会社 | 柱状部件 |
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RU2719114C1 (ru) | 2020-04-17 |
JPWO2018131516A1 (ja) | 2019-11-07 |
US20200001924A1 (en) | 2020-01-02 |
JP6743913B2 (ja) | 2020-08-19 |
MX2019008136A (es) | 2019-09-13 |
EP3569482A4 (en) | 2020-05-13 |
EP3569482A1 (en) | 2019-11-20 |
CN110191838A (zh) | 2019-08-30 |
BR112019010689A2 (pt) | 2019-10-01 |
US11260908B2 (en) | 2022-03-01 |
EP3569482B1 (en) | 2021-10-20 |
CN110191838B (zh) | 2021-09-14 |
KR102236841B1 (ko) | 2021-04-06 |
CA3049752A1 (en) | 2018-07-19 |
KR20190094403A (ko) | 2019-08-13 |
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