WO2013168331A1 - 車両用フレーム構造 - Google Patents
車両用フレーム構造 Download PDFInfo
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- WO2013168331A1 WO2013168331A1 PCT/JP2013/001567 JP2013001567W WO2013168331A1 WO 2013168331 A1 WO2013168331 A1 WO 2013168331A1 JP 2013001567 W JP2013001567 W JP 2013001567W WO 2013168331 A1 WO2013168331 A1 WO 2013168331A1
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- surface portion
- section
- bent
- strength
- vehicle
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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
- B62D29/00—Superstructures, understructures, or sub-units thereof, characterised by the material thereof
- B62D29/001—Superstructures, understructures, or sub-units thereof, characterised by the material thereof characterised by combining metal and synthetic material
- B62D29/002—Superstructures, understructures, or sub-units thereof, characterised by the material thereof characterised by combining metal and synthetic material a foamable synthetic material or metal being added in situ
Definitions
- the present invention belongs to a technical field related to a vehicle frame structure having a frame body constituting a vehicle body.
- a frame body used for a center pillar of a vehicle body in a vehicle is required to improve the strength against bending from the viewpoint of the side impact performance of the vehicle.
- a center pillar is arranged between an outer panel on the outer side of the vehicle body, an inner panel on the inner side of the vehicle body that forms a closed section together with the outer panel, and the outer panel and the inner panel. It is comprised with the arranged reinforcement member.
- the outer wall on the outer side of the vehicle body is formed thicker than the front wall and the rear wall, and gradually increases from the substantially central portion in the vehicle width direction toward the outer side of the vehicle body inside the front wall and the rear wall. It is disclosed to form a thickened outer thickened portion.
- Patent Document 2 is a structure on the premise of casting, and is difficult to apply to a method of manufacturing a panel by press forming a steel plate or the like. Further, there is a problem that the weight of the vehicle body needs to be increased, and the vehicle weight increases accordingly.
- Patent Document 1 Although the panel can be manufactured at low cost by press molding, there is room for improvement in order to improve the strength against bending while reducing the weight of the frame body.
- the present invention has been made in view of such a point, and the object of the present invention is to be easily manufactured by press molding, and to have a high strength against bending of the frame body due to an external input load, and is lightweight.
- the object is to provide a vehicle frame structure having a simple structure.
- the frame body has a first surface portion facing outward from the vehicle body, and facing the first surface portion.
- the second surface portion located on the inner side of the vehicle body of the first surface portion and wider than the first surface portion, the one side end portions in the width direction of the first surface portion and the second surface portion, and the other side end portions Each having two side portions that form a closed section together with the first surface portion and the second surface portion,
- Each of the side surfaces has one or more bent portions that are bent at an intermediate position between the first surface portion and the second surface portion in the cross section of the frame body, and the bent portions are formed on the side surface portions.
- the angle formed on the inner side of the closed cross section between the first surface portion and the outer portion is set to a value that is approximately 90 degrees or greater than 90 degrees, and in the cross section of the frame main body, there is one bent portion.
- the bent portion in a certain case and the bent portion on the second surface portion side in the case of a plurality are defined as a specific bent portion, and the specific bent portion is bent so as to protrude to the inside of the closed cross section.
- the side portion includes a low strength portion on the second surface portion side and an upper side.
- a strength changing portion which is a boundary between the low strength portion and the high strength portion in the at least one side surface portion of the first surface portion side.
- the structure is located on the side.
- an external input load impact load that causes the frame body to bend so that the middle portion in the longitudinal direction protrudes toward the inside of the vehicle body with respect to both ends
- an external input load impact load that causes the frame body to bend so that the middle portion in the longitudinal direction protrudes toward the inside of the vehicle body with respect to both ends
- a force acting on the first cross section of the side surface in the vicinity of the portion to which the external input load is applied or the vicinity thereof is generated, and the portion is locally buckled.
- the specific bent portion protrudes to the inside of the closed cross section, the inward force of the closed cross section is generated in the specific bent portion so as to cancel the outward force of the closed cross section.
- the end portion of the side surface portion on the first surface portion side in the vicinity of the portion where the external input load is applied is unlikely to locally buckle.
- the angle formed by the inside of the closed cross section between the first surface portion and the outer portion of the side surface portion is approximately 90 degrees or a value larger than 90 degrees, the first surface portion and the side surface portion are integrated by press molding.
- the strength of the frame body against bending is improved as compared with the case where there is no bent portion.
- the range of about 90 degrees includes 90 degrees, and is a range in which a normal error due to press molding is added to or subtracted from 90 degrees.
- the specific bent portion is positioned closer to the first surface portion than the center of gravity in the cross section of the frame body in a direction perpendicular to the first surface portion, and the strength changing portion is the first strength portion. In a direction perpendicular to the surface portion, it is preferably located on the second surface portion side with respect to the center of gravity.
- the specific bent portion when the externally applied load is applied to the first surface portion, the specific bent portion is positioned on the first surface portion side of the center of gravity of the cross section of the frame body in the direction perpendicular to the first surface portion. It is possible to satisfactorily cancel out the outward force of the closed section. That is, when the external input load is applied to the first surface portion, a compression force acts on the first surface portion side and a tensile force acts on the second surface portion side, with the center of gravity position as a boundary. Since the outward force of the closed cross section is generated in a portion where the compressive force acts, it is preferable that the specific bent portion for canceling the force is also located in the portion where the compressive force acts.
- the outward force of the closed cross section can be satisfactorily canceled by positioning the specific bent portion at a position where the compressive force acts, that is, on the first surface portion side with respect to the center of gravity.
- a compressive force effective to suppress the local buckling acts.
- the entire portion to be made can have high strength.
- the first surface portion approaches the second surface portion, so that the position of the center of gravity immediately before buckling is slightly closer to the second surface portion side than the initial position of the center of gravity before load input. Even if the position of the center of gravity moves in this way, the entire portion where the compressive force acts can be made high-intensity because the strength changing portion is located on the second surface side of the center of gravity. become.
- the number of the bent portions of each side surface portion is one, and the first surface portion and the outer portion of the cross section of the frame body are provided.
- the angle formed by the inside of the closed cross-section between the first main body and the first main body is approximately 90 degrees, and the first surface between the first surface and the portion of the second surface farthest from the first surface in the cross section of the frame body
- the distance along the direction perpendicular to the vertical direction is Ha
- the distance along the direction perpendicular to the first surface portion between the specific bent portion and the portion of the second surface portion farthest from the first surface portion is ha
- the distance along the direction perpendicular to the first surface portion between the strength changing portion and the portion of the second surface portion farthest from the first surface portion is Aa, 0.55 ⁇ ha / Ha ⁇ 0.90, and 0.40 ⁇ Aa / ha ⁇ 0.53 It is preferable to satisfy.
- the strength against bending of the frame body varies depending on the position of the specific bending portion in the direction perpendicular to the first surface portion. However, if 0.55 ⁇ ha / Ha ⁇ 0.90 is satisfied, the strength against bending of the frame body is increased. It can be improved satisfactorily.
- the intensity changing portion is positioned more than the center of gravity in the direction perpendicular to the first surface portion. While being able to be easily located in the 2 surface part side, the intensity
- the number of the bent portions of each side surface portion is one, and in the cross section of the frame main body, an angle formed by the inside of the closed cross section between the first surface portion and the outer portion is approximately 90.
- Ha is a distance along the direction perpendicular to the first surface portion between the first surface portion and the portion of the second surface portion farthest from the first surface portion
- the specific The distance along the direction perpendicular to the first surface portion between the bent portion and the portion of the second surface portion farthest from the first surface portion is ha, and the distance from the first surface portion of the strength changing portion and the second surface portion is the most.
- the frame main body constitutes a center pillar of a vehicle body
- a door mounting bracket is attached to a surface outside the vehicle body of the first surface portion of the frame main body.
- the mounting bracket has a base portion fixedly attached to the first surface portion, and a protruding portion that protrudes outward in the vehicle width direction from the base portion and has a door attached to the tip portion. It extends in the vehicle width direction at a position in the vicinity of the side surface portion on the rear side of the vehicle body, and only the side surface portion on the vehicle body rear side of the two side surface portions of the frame body is separated from the low strength portion and the high strength portion.
- the strength changing portion may be located closer to the second surface portion than the specific bent portion.
- the side impact performance of the vehicle can be improved with a light weight and simple configuration.
- the first surface portion side including the specific bent portion high in the side surface portion on the rear side of the vehicle body, local buckling that is likely to occur on the side surface portion on the rear side of the vehicle body is favorable among the two side surface portions. Can be suppressed. That is, when an external input load is input to the center pillar via the door and the door mounting bracket, the protrusion of the door mounting bracket falls to the rear side of the vehicle body with the end on the base side as the center. An external input load is input to a portion of the first surface portion closer to the rear side of the vehicle body.
- the first surface portion side including the specific bent portion in the side surface portion on the rear side of the vehicle body may be made high in strength. It will be. Since the specific bending strength portion is provided on the side surface portion on the front side of the vehicle body, the force toward the closed section outward can be canceled only by this, and the occurrence of local buckling can be sufficiently suppressed. As a result, the center pillar can be further reduced in weight.
- the vehicle frame structure of the present invention can be easily manufactured by press molding, is lightweight and has a simple structure, and improves the strength against bending of the frame body due to an external input load. Therefore, the collision performance of the vehicle body can be improved at low cost.
- FIG. 2 is a view corresponding to FIG.
- FIG. 2 is a view corresponding to FIG. 1 and showing a further modification of the low strength portion and the high strength portion.
- frame main body 3 is a graph showing the relationship between the pressing stroke and the pressing load of test frame bodies A to C. It is a figure which shows the improvement rate of a closed cross-sectional shape and Fmax mass efficiency according to the value of M. It is a graph which shows the relationship between the value of M, and the improvement rate of Fmax mass efficiency.
- FIG. 16 is a cross-sectional view taken along line XVI-XVI in FIG. 15.
- FIG. 1 shows a cross section of a frame body 1 to which a vehicle frame structure according to an embodiment of the present invention is applied.
- the frame main body 1 constitutes a center pillar of a vehicle body, and extends in a direction perpendicular to the paper surface of FIG. 1 (corresponding to the up-down direction when provided on the body). .
- the vehicle frame structure of the present invention may be applied to substantially the entire vertical direction of the center pillar, and a part of the center pillar in the vertical direction (for example, from the viewpoint of protecting the occupant's upper body in particular)
- a part of the center pillar in the vertical direction for example, from the viewpoint of protecting the occupant's upper body in particular
- On the upper part or the lower part where impact load is likely to be input in the event of a vehicle side collision particularly the part between the upper and lower two door mounting brackets (see reference numeral 31 in FIG. 15) for attaching the rear door to the center pillar) You may apply.
- the frame main body 1 includes an outer panel 2 positioned on the outer side of the vehicle body, an inner panel 3 positioned on the inner side of the vehicle body, and a reinforcement 4 (also referred to as an outer reinforcement) provided between the outer panel 2 and the inner panel 3.
- the outer panel 2 and the inner panel 3 constitute a closed section
- the inner panel 3 and the reinforcement 4 also constitute a closed section
- the outer panel 2 and the reinforcement 4 also constitute a closed cross section.
- the outer panel 2 has a main body 2a and flanges 2b connected to both ends of the main body 2a in the width direction (left-right direction in FIG. 1).
- the inner panel 3 includes a main body portion 3a and flange portions 3b connected to both ends of the main body portion 3a in the width direction (left-right direction in FIG. 1).
- the reinforcement 4 includes a main body portion 4a and flange portions 4b connected to both ends of the main body portion 4a in the width direction (left-right direction in FIG. 1).
- the outer panel 2, the inner panel 3, and the reinforcement 4 are respectively formed by press molding, and the frame body 1 is completed by joining the flange portions 2b, 3b, and 4b to each other after press molding.
- the vehicle frame structure of the present invention is applied to the inner panel 3 and the reinforcement 4.
- the outer panel 2 is basically provided from the viewpoint of design, and the main body 2 a covers the outside of the vehicle body of the reinforcement 4.
- the reinforcement 4 is preferably a high-strength steel plate having a tensile strength of 980 MPa or more and a plate thickness of 1.0 mm to 2.5 mm, and is preferably formed by hot press forming.
- the plate thickness is preferably 1.0 mm or more and 1.5 mm or less, and in the high strength portion 18, the plate thickness is preferably more than 1.5 mm and 2.5 mm or less. .
- the frame body 1 has a first surface portion 11 facing outward from the vehicle body, and a second surface that is positioned on the inner side of the vehicle body of the first surface portion 11 so as to face the first surface portion 11 and is wider than the first surface portion 11.
- 2 which forms the closed section with the 1st surface part 11 and the 2nd surface part 12 by connecting the one side edge parts of the width direction of the surface part 12, the 1st surface part 11, and the 2nd surface part 12, and the other side edge parts, respectively.
- two side portions 13 The first surface portion 11 and the two side surface portions 13 are constituted by the main body portion 4 a of the reinforcement 4, and the second surface portion 12 is constituted by the main body portion 3 a of the inner panel 3.
- the second surface portion 12 and the side surface portion 13 are connected.
- the second surface portion 12 (main body portion 3a) and the two flange portions 3b are located on the same straight line, and the first surface portion 11 (a portion excluding a bead 15 described later) is It is located on a straight line parallel to this straight line.
- a bead that protrudes inside a closed cross section (hereinafter simply referred to as a closed cross section) by the first surface section 11, the second surface section 12, and the side surface section 13 and extends in the longitudinal direction of the frame body 1 is disposed at the center in the width direction of the first surface section 11. 15 is formed.
- the bead 15 is at least a part of the first surface portion 11 in the longitudinal direction of the frame body 1 (for example, the upper portion of the center pillar, or the lower portion in which impact load is easily input when a vehicle side collision occurs (particularly, upper and lower two door mounting The part between the brackets 31 (see FIG. 15))) is sufficient.
- the bead 15 is not essential and can be eliminated. Moreover, the bead 15 may protrude outside the closed cross section.
- Each side surface portion 13 has one bent portion 14 (corresponding to a specific bent portion) that bends at an intermediate position between the first surface portion 11 and the second surface portion 12 in the cross section of the frame body 1. .
- the bent portion 14 is bent so as to protrude inside the closed cross section in the cross section of the frame body 1.
- the range of about 90 degrees includes 90 degrees, and is a range in which a normal error due to press molding is added to or subtracted from 90 degrees. If the angle ⁇ is basically 90 degrees or more, the first surface portion 11 and the two side surface portions 13 can be easily formed integrally by press molding.
- the corner portion of the first surface portion 11 and the outer side portion 13 a of the side surface portion 13 may be formed by an arc portion, and the side surface portion.
- the outer portion 13a and the inner portion 13b extend linearly in the cross section of the frame main body 1, respectively.
- Each of the side surfaces 13 includes a low strength portion 17 on the second surface portion 12 side and a high strength portion 18 on the first surface portion 11 side.
- the low strength portion 17 and the high strength portion 18 are The boundary is the intensity changing unit 19.
- the strength changing portion 19 is located closer to the second surface portion 12 than the bent portion 14.
- the low-strength portion 17 and the high-strength portion 18 have different plate thicknesses, and the thickness of the high-strength portion 18 is made larger than the plate thickness of the low-strength portion 17.
- the strength is set to be higher than the strength of the low strength portion 17.
- the reinforcement 4 is obtained by press molding using a plate material that has been molded so as to have two types of thickness during rolling.
- board thickness of the 1st surface part 11 can be made the same as the plate
- or its vicinity have the same thickness as the high intensity
- FIG. 5 only the corner portion of the first surface portion 11 and the outer portion 13a of the side surface portion 13 or the vicinity thereof is drawn as the same thickness as the high-strength portion 18).
- the plate thickness of the flange portion 4 b is the same as that of the low strength portion 17.
- the low-strength portion 17 and the high-strength portion 18 are configured by making the plate thicknesses different from each other, but the present invention is not limited to this.
- the reinforcing member 20 is joined to the portion that becomes the high-strength portion 18 of the plate material having a constant plate thickness, thereby forming the high-strength portion 18 and not joining the reinforcing member 20.
- the low strength portion 17 may be used.
- the reinforcing member 20 may be joined to the outside by welding.
- the reinforcement member 20 is joined to the plate material before press molding.
- the portion that becomes the high-strength portion 18 of the side surface portion 13 and the corner portion of the first surface portion 11 and the outer portion 13 a of the side surface portion 13 or the vicinity thereof are closed.
- the high strength portion 18 may be configured by filling the gap between the outer portion of the cross section and the outer panel 2 with the filler 21, and the portion corresponding to the gap not filled with the filler 21 may be the low strength portion 17.
- the filler 21 may be a heated foam material, for example. This heat-foamed material is in the form of a sheet in an unfoamed state, and is attached to a portion where the filler 21 is filled on the outer surface of the reinforcement 4 with the adhesive. Then, the sheet-like heated foam material is heated and foamed in the drying process after the entire vehicle body is immersed in the electrodeposition liquid, and is filled in the gap.
- the high-strength portion 18 may be configured by quenching a portion that becomes the high-strength portion 18 of the plate material having a constant plate thickness, and the non-quenched portion may be the low-strength portion 17.
- the low-strength portion 17 is configured by opening a plurality of through holes in a portion of the plate material having the same thickness as the high-strength portion 18 of the present embodiment and having a certain thickness, and having a low strength.
- a portion where the through hole is not opened may be the high-strength portion 18.
- the through hole can be used as a hole for assembling the frame main body 1 or a hole for assembling other parts to the frame main body 1.
- the frame body 1 Due to a side collision of the vehicle, an external input load is applied to the middle portion of the first surface portion 11 in the longitudinal direction of the frame body 1 (the frame body 1 is curved so that the middle portion of the longitudinal direction projects to the inside of the vehicle body with respect to both ends.
- the first surface portion 11 and the second surface portion 12 have different radii of curvature, and accordingly, the first surface portion 11 side (compression side).
- the second surface portion 12 side tensile side
- first surface portion 11 and the second surface portion 12 tend to approach each other also when the portion of the first surface portion 11 on which the external input load is applied is recessed by the external input load.
- a force closed cross-section
- the side surface portion 13 tilted to the outside of the closed cross-section with the flange portion 4b as a fulcrum at or near the end portion on the first surface portion 11 side of the side surface portion 13 near the portion where the external input load is applied.
- Force acting outward is generated, and the part is locally buckled (the part is locally swelled outside the closed section).
- the side surface portion 13 is provided with a bent portion 14 protruding inward of the closed cross section, and the bent portion 14 is inward of the closed cross section so as to cancel the outward force of the closed cross section. Power is generated.
- the end portion on the first surface portion 11 side of the side surface portion 13 in the vicinity of the portion where the external input load acts is unlikely to locally buckle. Therefore, the strength against bending of the frame body 1 due to the external input load can be ensured, and the side impact performance of the vehicle is improved.
- the occurrence of the local buckling can be effectively suppressed, and the side surface portion 13
- the two-surface part 12 side can be reduced in weight. Therefore, the strength against bending of the frame body 1 can be improved while reducing the weight of the frame body 1.
- the bead 15 is formed on the first surface portion 11, when an external input load acts on the portion where the bead 15 is formed, the portion of the first surface portion 11 on which the external input load acts is difficult to deform, Along with this, local buckling is further less likely to occur at the end portion of the side surface portion 13 on the first surface portion 11 side in the vicinity of the portion where the external input load is applied.
- the bent portion 14 (specific bent portion) is located closer to the first surface portion 11 than the center of gravity G (see FIG. 1) in the cross section of the frame body 1 in the direction perpendicular to the first surface portion 11, and the strength changing portion 19 is In the direction perpendicular to the first surface portion 11, the second surface portion 12 is preferably located on the second surface portion 12 side of the center of gravity G.
- the bent portion 14 Since the bent portion 14 is positioned closer to the first surface portion 11 than the center of gravity G in the direction perpendicular to the first surface portion 11, when the external input load acts on the first surface portion 11, The direction force can be satisfactorily canceled. That is, when the external input load is applied to the first surface portion 11, a compressive force is applied to the frame body 1 on the first surface portion 11 side with the position of the center of gravity G as a boundary, and a tensile force is applied to the second surface portion 12 side. Force acts. Since the outward force of the closed cross section is generated in a portion where the compressive force is applied, the bent portion 14 for canceling out the force is preferably located in the portion where the compressive force is applied.
- the bending portion 14 at a position where the compressive force acts, that is, closer to the first surface portion 11 than the center of gravity G, the outward force of the closed cross section can be satisfactorily canceled.
- the strength changing portion 19 is located on the second surface portion 12 side with respect to the center of gravity G in the direction perpendicular to the first surface portion 11, it is effective for suppressing the local buckling.
- the entire portion on which the compressive force acts can be increased in strength.
- the first surface portion 11 approaches the second surface portion 12, so that the position of the center of gravity G slightly changes from the initial position before load input immediately before buckling to the second surface portion 12.
- the portion where the compressive force acts because the strength changing portion 19 is located on the second surface portion 12 side from the initial position of the center of gravity G. The whole can be made strong.
- the first virtual straight line L ⁇ b> 1 connecting the end portion P ⁇ b> 1 on the first surface portion 11 side and the end portion P ⁇ b> 2 on the second surface portion 12 side of the side surface portion 13 is closed.
- the bent portion 14 is located inside the closed cross section with respect to the first virtual straight line L1.
- the first virtual straight line L1 corresponds to the side surface portion 13 without the bent portion 14. Even if the corners of the first surface portion 11 and the outer side portion 13a of the side surface portion 13 and the corner portions of the inner side portion 13b and the flange portion 4b are arcuate portions, here, P1 and P2 As shown in FIG. 3, the position of is the same as the sharp corner when there is no arc.
- the distance along the direction perpendicular to the first surface portion 11 between the end portion P1 on the first surface portion 11 side and the end portion P2 on the second surface portion 12 side of the side surface portion 13 is H
- the distance along the direction perpendicular to the first surface portion 11 between the bent portion 14 and the end portion P2 on the second surface portion 12 side of the side surface portion 13 is h
- the distance between the intersection P3 of the second virtual line L2 parallel to the first surface part 11 and the bent part 14 is ⁇
- the first virtual line L1 is on the acute angle side with respect to the direction perpendicular to the first surface part 11.
- the distance between the intersection point P3 and the intersection point P4 of the second imaginary straight line L2 and the third imaginary straight line L3 is (Hh) tan ⁇ , so ⁇ / (Hh)
- the angle ⁇ is 90 degrees or more. Therefore, at least the value of M should be greater than 0 and not greater than 1.0.
- the first surface portion 11 between the bent portion 14 (specific bent portion) and the portion of the second surface portion 12 that is farthest from the first surface portion 12 is defined as Ha (substantially equal to H in this embodiment).
- ha in this embodiment, substantially equal to h
- the bending strength of the frame main body 1 varies depending on the position of the bent portion 14 in the direction perpendicular to the first surface portion 11, and if the equation (3) (particularly the equation (4)) is satisfied, the bending against the bending of the frame main body 1 is satisfied.
- the strength can be improved satisfactorily (see FIGS. 8 and 9).
- ha and Ha are based on the portion of the second surface portion 12 that is farthest from the first surface portion 12 is that this portion generates maximum tensile stress when the frame body 1 is bent by an external input load. This is because it is considered appropriate to use the standard.
- the angle ⁇ formed by the inside of the closed cross section between the first surface portion 11 and the outer portion 13 a is approximately 90 degrees, the first surface portion of the strength changing portion 19 and the second surface portion 12.
- the distance along the direction perpendicular to the first surface portion 11 between the portion farthest from 11 is Aa (in this embodiment, the strength changing portion 19 and the end portion P2 on the second surface portion 12 side of the side surface portion 13 and
- the distance A1 (approximately equal to the distance A1 (see FIG. 4) along the direction perpendicular to the first surface portion 11) between 0.40 ⁇ Aa / ha ⁇ 0.66 (5) It is preferable to satisfy.
- the strength of the frame body 1 against bending can be improved satisfactorily.
- the strength of the frame main body 1 against bending can be improved satisfactorily by setting the position of the strength changing portion 19 to satisfy 0.40 ⁇ Aa / ha ⁇ 0.66.
- the strength changing portion 19 can be easily positioned closer to the second surface portion 12 than the center of gravity G in the direction perpendicular to the first surface portion 11, and the strength against bending of the frame body 1 is good. Can be improved.
- test frame main bodies A and B having the bent portion 14 provided on the side surface portion 13 and the test frame main body not provided with the bent portion 14 are provided.
- a three-point bending test was performed on C.
- the side surface portion 13 is not provided with the strength changing portion 19.
- the test frame main body B is provided with a bead 15 on the entire test frame main body in the longitudinal direction at the approximate center in the width direction of the first surface portion 11 with respect to the test frame main body A.
- the bead 15 protrudes inside the closed cross section.
- These test frame main bodies A to C constitute a center pillar as in the case of the frame main body 1, but the outer frame 2 is not provided on the test frame main bodies A to C (other test frame main bodies described later). The same).
- FIG. 4 shows the result of examining the relationship between the pressing stroke of the indenter at that time and the pressing load (bending load) as an external input load.
- h / H in this embodiment, substantially equal to ha / Ha is kept constant at 0.75.
- the positions of P1 and P2 and the value of the angle ⁇ of the first virtual line L1 are also constant.
- the sign is positive when the bent portion 14 is positioned inside the closed section relative to the first virtual straight line L1, and is negative when positioned outside the closed section. . That is, when ⁇ (M) is negative, the bent portion 14 is bent so as to protrude outside the closed section. Further, when the value of M exceeds 1, the bending portion 14 is positioned on the inner side of the closed cross section with respect to the third virtual straight line L3 (the angle ⁇ is smaller than 90).
- the improvement rate of the Fmax mass efficiency is improved compared to the case where the side portion 13 does not have the bent portion 14. The rate of improvement in Fmax mass efficiency is strictly determined from the viewpoint of weight reduction.
- FIGS. 6 The relationship between the value of M and the improvement rate of Fmax mass efficiency is shown in FIGS. Moreover, in FIG. 6, the closed cross-sectional shape according to the value of M is shown collectively.
- the positions of P1 and P2 and the value of the angle ⁇ of the first virtual line L1 are also constant.
- FIG. 8 and 9 show the relationship between the h / H value and the Fmax mass efficiency improvement rate. Moreover, in FIG. 8, the closed cross-sectional shape according to the value of h / H is shown collectively.
- the Fmax mass efficiency is improved, but the h / H value is 0.55 or more and 0.90 or less. If it is 60 or more and 0.85 or less, Fmax mass efficiency can be improved favorably.
- the outward force of the closed cross section generated at the end portion of the side surface portion 13 on the first surface portion 11 side or in the vicinity thereof can be improved. Can be countered.
- the strength changing portion 19 is not provided on the side surface portion 13.
- the test frame main body provided with the strength changing portion 19 on the side surface portion 13.
- the strength changing portion 19 is provided on the side surface portion 13. That is, the low-strength portion 17 and the high-strength portion 18 have different plate thicknesses, and the low-strength portion 17 has a thickness of 1 mm and the high-strength portion 18 has a thickness of 2 mm.
- the plate thickness of the first surface portion 11 is made the same as the plate thickness of the high strength portion 18, and the plate thickness of the flange portion 4 b is made the same as that of the low strength portion 17.
- a bead 15 is provided on the first surface portion 11. Other points are the same as those of the test frame main body when the relationship between the value of h / H and the improvement rate of Fmax mass efficiency is examined.
- the position of the intensity changing portion 19 (value of A1 / h) ) was changed, and the above three-point bending test was performed to obtain the improvement rate of Fmax mass efficiency.
- the value of A1 is a distance along the direction perpendicular to the first surface portion 11 between the strength changing portion 19 and the end portion P2 of the side surface portion 13 on the second surface portion 12 side (see FIG. 4).
- the value of H (Ha) is 76.5 mm, which is the same for all test frame bodies.
- FIG. 11 shows the relationship between the value of A1 / h (substantially equal to the value of Aa / ha) and the improvement rate of Fmax mass efficiency when the value of h / H is 0.55.
- FIG. 12 shows the relationship between the value of A1 / h (Aa / ha) and the improvement rate of Fmax mass efficiency when 0.75, and A1 / h when the value of h / H is 0.90.
- the relationship between the value of (Aa / ha) and the improvement rate of Fmax mass efficiency is shown in FIG.
- the value of A1 / h indicated by the alternate long and short dash line is a value corresponding to the position of the center of gravity in the cross section of each test frame main body. If the value of A1 / h is smaller than the value corresponding to the position of the center of gravity, the intensity changing portion 19 is located on the second surface portion 12 side of the center of gravity in the direction perpendicular to the first surface portion 11. It will be.
- the intensity changing portion 19 is located on the first surface portion 12 side with respect to the center of gravity in the direction perpendicular to the first surface portion 11.
- the improvement rate of Fmax mass efficiency can be set to a high level.
- each bent portion 14 is provided on each side surface portion 13, but a plurality of bent portions 14 may be provided on each side surface portion 13.
- the first surface portion 11 side of the plurality of bent portions 14 that is closest to the first surface portion 11 side of the plurality of bent portions 14 is the first surface portion.
- 11 and the outer side portion 13a is set to an angle between the inner side of the closed section and a value larger than about 90 degrees or larger than 90 degrees, and the second surface portion 12 side of the plurality of bent portions 14 of each side surface portion 13 is the most.
- the bent portion 14 (corresponding to the specific bent portion) may be bent so as to protrude to the inside of the closed section.
- the remaining bent portions 14 may protrude outward from the closed cross section or may protrude outward from the closed cross section. That is, there is a bent portion 14 projecting outside the closed cross section between the end portion of the side surface portion 13 on the first surface portion 11 side and the bent portion 14 (specific bent portion) closest to the second surface portion 12 side. In addition to the outward force of the closed cross section generated at the end of the side surface portion 13 on the first surface portion 11 side or in the vicinity thereof, even if the outward force of the closed cross section is generated at the bent portion 14 protruding outside the closed cross section, these This force can be canceled by the inward force of the closed cross section generated at the bent portion 14 (specific bent portion) closest to the second surface portion 12.
- the side surface portion 13 is connected to the low strength portion 17 on the second surface portion 12 side and the first strength portion 17.
- the strength changing portion 19, which is a boundary between the low strength portion 17 and the high strength portion 18, is located closer to the second surface portion 12 than the specific bent portion. If you do.
- the specific bent portion is located on the first surface portion 11 side with respect to the center of gravity G in the cross section of the frame body 1 in the direction perpendicular to the first surface portion 11, and the strength changing portion 19 is perpendicular to the first surface portion 11. In the direction, it is preferable to be located on the second surface portion 12 side with respect to the center of gravity G.
- ha is a distance along the direction perpendicular to the first surface portion 11 between the specific bent portion and the portion of the second surface portion 12 farthest from the first surface portion 11.
- the above three-point bending test is performed on the test frame bodies D to F in which the two bent portions 14 are provided on each side surface portion 13, and the test frame body F having the Fmax mass efficiency of the test frame bodies D and E is tested.
- the improvement rate for was calculated.
- the side surface portion 13 is not provided with the strength changing portion 19.
- the bent portion 14 on the upper side is bent so as to protrude inside the closed cross section, and the bent portion 14 on the lower side (second surface portion side) also protrudes inside the closed cross section. Is bent.
- the upper bent portion 14 is bent so as to protrude outside the closed cross section, and the lower bent portion 14 is bent so as to protrude inside the closed cross section.
- the test frame main body F the upper bent portion 14 is bent so as to protrude inside the closed cross section, and the lower bent portion 14 is bent so as to protrude outside the closed cross section.
- the cross-sectional shape of the test frame main bodies D to F is different from the cross-sectional shape of the test frame main body when the number of the bent portions 14 is one only in the shape of the side surface portion 13.
- FIG. 14 shows the improvement rate of the Fmax mass efficiency of the test frame bodies D and E (the improvement rate relative to the frame body F).
- the strength changing portion 19 is moved to the bent portion 14 on the second surface portion side (specific bent portion) as in the case of one bent portion 14. ) Is positioned closer to the second surface portion 12 than the first surface portion 11 side including the specific bent portion in the side surface portion 13, so that the local buckling is effectively suppressed. In addition, the weight of the second surface portion 12 side of the side surface portion 13 can be reduced.
- the two side surface portions 13 are both composed of the low strength portion 17 and the high strength portion 18 (having the strength changing portion 19). Only the side surface portion 13) has the strength changing portion 19, and the other side surface portion 13 may not have the strength changing portion 19. In this case, from the viewpoint of weight reduction, the entire other side surface portion 13 becomes the same low strength portion as the low strength portion 17 of the one side surface portion 13 (for example, the plate thickness of the other side surface portion 13 is It is preferable that the thickness is the same as that of the low-strength portion 17 of the one side surface portion 13).
- a rear door (not shown) is centered on a lower portion and a lower portion of the center portion in the vertical direction on the outer surface of the first surface portion 11 of the center pillar 30 (frame body).
- Door mounting brackets 31 for mounting on the pillars 30 are respectively mounted via the outer panel 2.
- Each of the door mounting brackets 31 includes a base portion 31a and protruding portions 31b that protrude outward in the vehicle width direction from the upper and lower ends of the base portion 31.
- the base portion 31a is attached and fixed to the first surface portion 11 via the outer panel 2 with bolts and nuts (not shown).
- the 1st surface part 11 is contact
- the vehicle body rear end of the base portion 31a is located in the vicinity of the side portion 13 on the vehicle rear side (right side in FIGS. 15 and 16) in the vehicle front-rear direction, and the protrusion 31b is located on the vehicle rear side in the vehicle front-rear direction. It extends in the vehicle width direction at a position near the side surface portion 13.
- the end portion of the protruding portion 31 b on the base portion 31 a side extends to the front side of the vehicle body and is connected to the rear portion and the front portion of the upper and lower end portions of the base portion 31 a. What is necessary is just to be connected to the rear part at least in the edge part of the up-and-down both sides.
- a rotating member 32 disposed between the two protruding portions 31b is attached to the distal end portions of the two protruding portions 31b so as to be rotatable around a shaft 33 extending in the vertical direction. 32 is fixed to the rear door, whereby the rear door is attached to the center pillar 30 via the door attachment bracket 31 so as to be rotatable around the shaft 33.
- the side surface portion 13 on the rear side of the vehicle body includes a low strength portion 17 on the second surface portion 12 side and a high strength portion 18 on the first surface portion 11 side, and the plate thickness of the high strength portion 18 is that of the low strength portion 17. Greater than the plate thickness.
- the plate thickness of the first surface portion 11 and the side surface portion 13 on the front side of the vehicle body is the same as the thickness of the low strength portion 17 in the side surface portion 13 on the rear side of the vehicle body.
- the specific buckling portion is provided on the side surface portion 13 on the front side of the vehicle body, it is possible to cancel the outward force of the closed cross section alone, and the occurrence of local buckling can be sufficiently suppressed. As a result, the center pillar 30 can be further reduced in weight.
- the vehicle frame structure of the present invention is applied to the inner panel 3 and the reinforcement 4, but may be applied to the outer panel 2 and the inner panel 3.
- the 1st surface part 11 and the side part 13 should just be comprised with the main-body part 2a of the outer panel 2, and the reinforcement 4 may or may not exist.
- the vehicle frame structure of the present invention includes a bumper reinforcement, a front side frame (particularly a kick-up portion), a side sill that extends in the vehicle longitudinal direction on both sides in the vehicle width direction of the floor panel, and a roof panel.
- Roof rails that extend in the vehicle longitudinal direction on both sides in the vehicle width direction, roof cross members that are provided on the roof rails and extend in the vehicle width direction, front pillars, rear side frames, floor cross members that are provided on the floor panel and extend in the vehicle width direction, etc. It is also possible to apply.
- the present invention is useful for a vehicle frame structure having a frame main body constituting a vehicle body, and particularly useful when the frame main body constitutes a center pillar of the vehicle body.
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Abstract
Description
上記各側面部は、上記フレーム本体の断面において、上記第1面部と上記第2面部との間の中間位置にて屈曲する1つ又は複数の屈曲部を有し、上記側面部において上記屈曲部が1つである場合の当該屈曲部よりも第1面部側の部分及び複数である場合の最も第1面部側の屈曲部よりも第1面部側の部分を外側部として、上記フレーム本体の断面において、上記第1面部と上記外側部との間の閉断面内側のなす角度が、略90度又は90度よりも大きい値に設定され、上記フレーム本体の断面において、上記屈曲部が1つである場合の当該屈曲部及び複数である場合の最も第2面部側の屈曲部を特定屈曲部として、該特定屈曲部が、閉断面内側に突出するように屈曲しており、少なくも一方の上記側面部は、上記第2面部側の低強度部と、上記第1面部側の高強度部とからなり、上記少なくも一方の側面部において、上記低強度部と上記高強度部との境界である強度変化部が、上記特定屈曲部よりも上記第2面部側に位置している、という構成とした。
0.55≦ha/Ha≦0.90、及び、
0.40≦Aa/ha≦0.53
を満たす、ことが好ましい。
0.55≦ha/Ha≦0.90、及び、
0.40≦Aa/ha≦0.66
を満たすようにしてもよい。
0.5≦δ/(H-h)tanθ≦1.0 …(1)
を満たすことが好ましい。
0.8≦δ/(H-h)tanθ≦1.0 …(2)
を満たすことである。
0.55≦ha/Ha≦0.90…(3)
を満たすことが好ましい。
0.60≦ha/Ha≦0.85…(4)
を満たすことである。
0.40≦Aa/ha≦0.66…(5)
を満たすことが好ましい。
0.40≦Aa/ha≦0.53…(6)
を満たすようにしてもよい。
2 アウタパネル
3 インナパネル
4 レインフォースメント
11 第1面部
12 第2面部
13 側面部
14 屈曲部(特定屈曲部)
17 低強度部
18 高強度部
19 強度変化部
30 センターピラー
31 ドア取付用ブラケット
31a 基部
31b 突出部
Claims (5)
- 車体を構成するフレーム本体を有する車両用フレーム構造であって、
上記フレーム本体は、車体外方を向く第1面部と、該第1面部と対向するように第1面部の車体内側に位置し、該第1面部よりも幅広である第2面部と、第1面部と第2面部との幅方向の一側端部同士及び他側端部同士をそれぞれ繋いで、上記第1面部及び上記第2面部と共に閉断面を構成する2つの側面部とを有し、
上記各側面部は、上記フレーム本体の断面において、上記第1面部と上記第2面部との間の中間位置にて屈曲する1つ又は複数の屈曲部を有し、
上記側面部において上記屈曲部が1つである場合の当該屈曲部よりも第1面部側の部分及び複数である場合の最も第1面部側の屈曲部よりも第1面部側の部分を外側部として、上記フレーム本体の断面において、上記第1面部と上記外側部との間の閉断面内側のなす角度が、略90度又は90度よりも大きい値に設定され、
上記フレーム本体の断面において、上記屈曲部が1つである場合の当該屈曲部及び複数である場合の最も第2面部側の屈曲部を特定屈曲部として、該特定屈曲部が、閉断面内側に突出するように屈曲しており、
少なくも一方の上記側面部は、上記第2面部側の低強度部と、上記第1面部側の高強度部とからなり、
上記少なくも一方の側面部において、上記低強度部と上記高強度部との境界である強度変化部が、上記特定屈曲部よりも上記第2面部側に位置していることを特徴とする車両用フレーム構造。 - 請求項1記載の車両用フレーム構造において、
上記特定屈曲部は、上記第1面部に垂直な方向において、上記フレーム本体の断面における重心よりも上記第1面部側に位置し、
上記強度変化部は、上記第1面部に垂直な方向において、上記重心よりも上記第2面部側に位置していることを特徴とする車両用フレーム構造。 - 請求項2記載の車両用フレーム構造において、
上記各側面部の上記屈曲部は1つであり、
上記フレーム本体の断面において、上記第1面部と上記外側部との間の閉断面内側のなす角度が、略90度であり、
上記フレーム本体の断面において、上記第1面部と上記第2面部における第1面部から最も離れた部分との間の第1面部に垂直な方向に沿った距離をHaとし、上記特定屈曲部と上記第2面部における第1面部から最も離れた部分との間の第1面部に垂直な方向に沿った距離をhaとし、上記強度変化部と上記第2面部における第1面部から最も離れた部分との間の第1面部に垂直な方向に沿った距離をAaとしたとき、
0.55≦ha/Ha≦0.90、及び、
0.40≦Aa/ha≦0.53
を満たすことを特徴とする車両用フレーム構造。 - 請求項1記載の車両用フレーム構造において、
上記各側面部の上記屈曲部は1つであり、
上記フレーム本体の断面において、上記第1面部と上記外側部との間の閉断面内側のなす角度が、略90度であり、
上記フレーム本体の断面において、上記第1面部と上記第2面部における第1面部から最も離れた部分との間の第1面部に垂直な方向に沿った距離をHaとし、上記特定屈曲部と上記第2面部における第1面部から最も離れた部分との間の第1面部に垂直な方向に沿った距離をhaとし、上記強度変化部と上記第2面部における第1面部から最も離れた部分との間の第1面部に垂直な方向に沿った距離をAaとしたとき、
0.55≦ha/Ha≦0.90、及び、
0.40≦Aa/ha≦0.66
を満たすことを特徴とする車両用フレーム構造。 - 請求項1~4のいずれか1つに記載の車両用フレーム構造において、
上記フレーム本体は、車体のセンターピラーを構成するものであり、
上記フレーム本体の第1面部の車体外側の面には、ドア取付用ブラケットが取り付けられており、
上記ドア取付用ブラケットは、上記第1面部に取付固定された基部と、該基部から車幅方向外側に突出しかつ先端部にドアが取り付けられる突出部とを有し、
上記突出部は、車体前後方向において車体後側の側面部の近傍位置にて車幅方向に延びており、
上記フレーム本体の2つの側面部のうち上記車体後側の側面部のみが、上記低強度部と上記高強度部とからなり、該車体後側の側面部において、上記強度変化部が、上記特定屈曲部よりも上記第2面部側に位置していることを特徴とする車両用フレーム構造。
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US14/390,874 US9260137B2 (en) | 2012-05-08 | 2013-03-11 | Vehicle frame structure |
CN201380023932.1A CN104349968B (zh) | 2012-05-08 | 2013-03-11 | 车辆车架构造 |
DE112013002378.4T DE112013002378B4 (de) | 2012-05-08 | 2013-03-11 | Fahrzeugrahmenstruktur |
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JP (1) | JP5935494B2 (ja) |
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JP2011088596A (ja) * | 2009-10-26 | 2011-05-06 | Mazda Motor Corp | 車両の車体構成部材 |
JP2011251659A (ja) * | 2010-06-03 | 2011-12-15 | Unipres Corp | 自動車車体のピラー構造 |
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JP6376318B1 (ja) * | 2017-03-24 | 2018-08-22 | 新日鐵住金株式会社 | ハット部材およびその製造方法 |
WO2018174082A1 (ja) * | 2017-03-24 | 2018-09-27 | 新日鐵住金株式会社 | ハット部材およびその製造方法 |
CN110446649A (zh) * | 2017-03-24 | 2019-11-12 | 日本制铁株式会社 | 帽构件及其制造方法 |
CN109866831A (zh) * | 2017-12-04 | 2019-06-11 | 丰田自动车株式会社 | 车辆用面板结构 |
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US9260137B2 (en) | 2016-02-16 |
JP2013233838A (ja) | 2013-11-21 |
DE112013002378T5 (de) | 2015-01-22 |
JP5935494B2 (ja) | 2016-06-15 |
CN104349968B (zh) | 2016-10-26 |
DE112013002378B4 (de) | 2018-09-27 |
US20150115654A1 (en) | 2015-04-30 |
CN104349968A (zh) | 2015-02-11 |
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