Body component and method of manufacturing body component

Abstract

To improve collision performance.SOLUTION: A vehicle body member includes a flat main body member and a reinforcement member. The main body member includes: a top plate that extends in an extension direction; a first side wall portion, a second side wall portion, a first flange portion, and a second flange portion. The first and second side wall portions project from both ends of the top plate in a width direction. The first and second flange portions are provided at ends of the first and second side wall portions on the opposite sides of the top plate, respectively. The reinforcement member is joined to an inner peripheral surface of the main body member through patchwork by welding, and the top plate, the first and second side wall portions, and the first and second flange portions are formed through patchwork by press molding.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a body member that forms part of a vehicle body, and a method for manufacturing the body member. [Background technology]

[0002] As described in Patent Document 1, it is known that a rocker, which is a rectangular cylindrical member located under a vehicle door, is formed by a rocker inner panel and a rocker reinforcement. In the rocker of Patent Document 1, the outer peripheral surface of an L-shaped reinforcement with an L-shaped cross section is welded to the inner peripheral surface of the rocker reinforcement. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-222172 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the rocker of Patent Document 1, the L-shaped reinforcement has multiple bearing surfaces that protrude from the outer periphery, and these bearing surfaces are welded to the rocker reinforcement. This creates a gap between the L-shaped reinforcement and the rocker reinforcement, which reduces the total plastic moment of the rocker and may reduce the impact performance of the rocker.

[0005] In one aspect of the present disclosure, it is desirable to facilitate improved crash performance. [Means for solving the problem]

[0006] One aspect of the present disclosure is a body member constituting a portion of a vehicle body, the body member comprising a plate-shaped main body member and a reinforcing member. The main body member comprises a top plate portion, first and second side wall portions, a first flange portion, and a second flange portion. The top plate portion is a plate-shaped portion extending in an extension direction. The first and second side wall portions are wall-shaped portions protruding from both ends of the top plate portion in a width direction substantially perpendicular to the extension direction, and are portions facing each other in the width direction. The first flange portion is provided at an end of the first side wall portion opposite the top plate portion and protrudes to the opposite side of the second side wall portion. The second flange portion is provided at an end of the second side wall portion opposite the top plate portion and protrudes to the opposite side of the first side wall portion. The reinforcing member is joined to the inner peripheral surface of the main body member by patchwork welding, and the top plate portion, first and second side wall portions, and first and second flange portions are formed by patchwork press molding.

[0007] According to the above configuration, the main body member and the reinforcing member are welded together by patchwork welding, which prevents a gap from forming between the inner peripheral surface of the main body member and the reinforcing member, thereby improving the total plastic moment of the body member and therefore the collision performance of the body member.

[0008] In one embodiment of the present disclosure, the main body member may have a first portion and a second portion that are plate-shaped portions joined by tailored blank welding. According to the above-described configuration, each portion of the main body member can be made of an appropriate material, which makes it easier to manufacture the body member while suppressing a decrease in collision performance.

[0009] In one embodiment of the present disclosure, the first and second regions may be located at the first and second ends in the stretching direction, respectively. The second region may have a widthwise length that increases toward the second end. The tensile strength of the first region may be higher than the tensile strength of the second plate material.

[0010] According to the above configuration, since the second portion has a lower tensile strength than the first portion, press forming is facilitated, and by forming the main body member by tailored blank welding, the body member can be manufactured more efficiently. In addition, the collision performance of the first portion can be improved.

[0011] In one embodiment of the present disclosure, the reinforcing member may be arranged to straddle the boundary between the first portion and the second portion of the main body member and may be joined to the first portion and the second portion. According to the above configuration, the welded portion that joins the first member and the second member can be suitably reinforced.

[0012] In one aspect of the present disclosure, the body member may be a rocker rear inner member that is mounted on a vehicle with its extension direction substantially aligned with the front-to-rear direction of the vehicle. According to the above configuration, the collision performance of the rocker rear inner member is improved.

[0013] In one aspect of the present disclosure, the method for manufacturing the above-described body member may include joining the main body member and the reinforcing member by patchwork welding, and performing patchwork press forming on the welded main body member and reinforcing member.

[0014] According to the above configuration, the collision performance of the body member is improved. In one aspect of the present disclosure, the above-mentioned method for manufacturing a body member may further include forming the body member by joining a first plate material and a second plate material, which are plate-shaped members, by tailored blank welding.

[0015] According to the above configuration, the body member can be manufactured more easily while suppressing a decrease in collision performance. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is an explanatory diagram of a vehicle body having a rocker rear inner member according to a first embodiment. FIG. [Figure 2]FIG. 2 is a perspective view of the rocker rear inner member of the first embodiment as viewed from the inner peripheral surface side. [Figure 3] Fig. 3A is a front view of the rocker rear inner member of the first embodiment, Fig. 3B is a bottom view of the rocker rear inner member of the first embodiment viewed from below, and Fig. 3C is a plan view of the rocker rear inner member of the first embodiment viewed from above. [Figure 4] Fig. 4A is a side view of the rocker rear inner member of the first embodiment as seen from the front end side, Fig. 4B is a side view of the rocker rear inner member of the first embodiment as seen from the rear end side, Fig. 4C is a cross-sectional view taken along line IVC-IVC in Fig. 3A, and Fig. 4D is a cross-sectional view taken along line IVD-IVD in Fig. 3A. [Figure 5] FIG. 2 is a plan view of the bonding material according to the first embodiment. [Figure 6] FIG. 10 is a plan view of a main body blank according to a second embodiment. [Figure 7] FIG. 10 is a plan view of a bonding material according to a second embodiment. [Figure 8] FIG. 10 is a perspective view of the rocker rear inner member of the second embodiment as viewed from the inner peripheral surface side. [Figure 9] Fig. 9A is a front view of the rocker rear inner member of the second embodiment, Fig. 9B is a bottom view of the rocker rear inner member of the second embodiment viewed from below, and Fig. 9C is a plan view of the rocker rear inner member of the second embodiment viewed from above. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings. [1. First embodiment] [(1) Rear inner rocker component] The rocker rear inner member 1 of the first embodiment is a component that constitutes part of the vehicle body B, and is located in the lower frame portions of the left and right rear doors of the vehicle (see FIG. 1). The rocker rear inner member 1 is disposed so as to extend in the longitudinal direction of the vehicle. Hereinafter, the front and rear ends of the rocker rear inner member 1 will be referred to as the rocker rear inner front end 10 and the rocker rear inner rear end 11, respectively. The rocker rear inner rear end 11 is located near the rear wheels of the vehicle. As an example, the rocker rear inner member 1 shown in FIGS. 2 to 4D is provided on the right side of the vehicle. In the following description, the center side and end side of the vehicle in the lateral direction will simply be referred to as the inside and outside, respectively. The rocker rear inner member 1 is manufactured by patchwork, and includes a main body member 2 and a reinforcing member 3, which are plate-shaped components (see FIG. 2).

[0018] [(2) Main body parts] The main body member 2 includes a top plate portion 20, first and second side wall portions 21, 22, and first and second flange portions 23, 24 (see FIGS. 2 to 4D).

[0019] The top panel portion 20 is a plate-shaped portion extending in an extension direction E that substantially coincides with the front-rear direction of the vehicle. The top panel portion 20 also extends in the up-down direction. The first and second side wall portions 21, 22 are wall-like portions that protrude outward from both ends of the top panel portion 20 in a width direction W that is perpendicular to the extension direction E. The first and second side wall portions 21, 22 face each other in the width direction W. The width direction W substantially coincides with the up-down direction, with the first side wall portion 21 located on the upper side and the second side wall portion 22 located on the lower side.

[0020] The first flange portion 23 is a flange-shaped portion provided at the end of the first side wall portion 21 opposite the top plate portion 20, and protrudes to the opposite side of the second side wall portion 22. The second flange portion 24 is a flange-shaped portion provided at the end of the second side wall portion 22 opposite the top plate portion 20, and protrudes to the opposite side of the first side wall portion 21.

[0021] The first and second flange portions 23, 24 and the top plate portion 20 are aligned in the left-right direction, with the first and second flange portions 23, 24 positioned on the outer side of the vehicle and the top plate portion 20 positioned on the inner side of the vehicle.

[0022] The top plate portion 20, the first and second side wall portions 21, 22, and the first and second flange portions 23, 24 extend from the rocker rear inner front end 10 to the rocker rear inner rear end 11, and the main body member 2 has a cross section perpendicular to the extension direction E that is so-called hat-shaped (see Figures 4A to 4C).

[0023] The main body member 2 also has a front portion 25 and a rear portion 26 aligned in the front-rear direction. The front portion 25 is located on the front side, and has a substantially constant length in the width direction W (hereinafter simply referred to as width).

[0024] The rear region 26 is located rearward and its width increases toward the rear (see FIGS. 2 and 3A). More specifically, in the rear region 26, the second flange 24 extends substantially straight along the extension direction E, while the first flange 23 curves upward toward the rear, increasing the distance between the first and second flanges 23, 24 toward the rear. The top plate 20 in the rear region 26 has a substantially constant width but slopes upward toward the rear. In the rear region 26, the distance between the first and second sidewalls 21, 22 also increases toward the rear. In the rear region 26, the distance (i.e., the height) between the first and second flanges 23, 24 and the top plate 20 increases toward the rear (see FIGS. 3B and 3C).

[0025] [(3) Reinforcement members] The reinforcing member 3 is welded to the inner peripheral surface 27 of the main body member 2 by patchwork (see FIGS. 2, 3A, 4C, and 4D). The reinforcing member 3 includes a main body portion 30, a first side portion 31, and a second side portion 32.

[0026] The main body portion 30 is a plate-shaped portion extending in the extension direction E, and is arranged so as to overlap the top plate portion 20 of the main body member 2. The main body portion 30 has a wide portion 30A and a narrow portion 30B that are aligned in the extension direction E. The wide portion 30A is located in front of the narrow portion 30B and forms the front end of the reinforcing member 3 (hereinafter, reinforcing member front end 33), while the narrow portion 30B forms the rear end (hereinafter, reinforcing member rear end 34). The wide portion 30A is wider than the narrow portion 30B and extends across the entire area of the top plate portion 20 in the width direction W. The narrow portion 30B is narrower than the top plate portion 20, has a substantially constant width, and is arranged adjacent to the first side wall portion 21.

[0027] The first side portion 31 is a wall-like portion that protrudes from the upper end of the main body portion 30 to the outside of the vehicle, and extends from the front end to the rear end of the main body portion 30. The first side portion 31 is disposed so as to overlap the first side wall portion 21.

[0028] The second side portion 32 is a wall-shaped portion that protrudes from the entire lower end of the wide portion 30A, and is arranged so as to overlap the second side wall portion 22. The second side portion 32 has a shape in which the center in the extension direction E protrudes outward from the vehicle.

[0029] The reinforcing member 3 is joined to the front region 25 and the rear region 26. As an example, the wide portion 30A is joined to the front region 25. The narrow portion 30B is joined to the front region 25 and the rear region 26, and the rear end 34 of the reinforcing member reaches the rear region 26. However, this is not limiting, and the reinforcing member 3 may be joined only to the front region 25.

[0030] [(4) Manufacturing method of rocker rear inner member] As described above, the rocker rear inner member 1 is formed by patchwork. The manufacturing method of the rocker rear inner member 1 includes a welding step and a press forming step for the patchwork.

[0031] In the welding process, the main body blank 2A and the reinforcing blank 3A are joined by welding (spot welding as an example) to form the joined material 1A (see FIG. 5). The main body blank 2A and the reinforcing blank 3A are blanks for forming the main body member 2 and the reinforcing member 3, respectively, and are sheared to have shapes corresponding to the main body member 2 and the reinforcing member 3. As an example, these members are L-shaped.

[0032] The material constituting the main body blank 2A and the reinforcing blank 3A may be, for example, steel, more specifically, high-tensile steel, and as an example, the reinforcing blank 3A may be made of steel having a tensile strength of 980 MPa or less.

[0033] In the subsequent press forming process, the joining material 1A is subjected to cold press forming, for example, to form the rocker rear inner member 1 shown in Fig. 2 etc. In other words, the top plate portion 20, the first and second side wall portions 21, 22, and the first and second flange portions 23, 24 of the main body member 2, and the main body portion 30 and the first and second side portions 31, 32 of the reinforcing member 3 are formed in the press forming process.

[0034] [2. Second Embodiment] [(1) Overview] The rocker rear inner member 1 of the second embodiment has a similar configuration to that of the first embodiment, but differs from the first embodiment in that the main body member 2 is formed by tailored blank welding. Specifically, the manufacturing method of the rocker rear inner member 1 of the second embodiment includes a tailored blank welding process, and the same welding process and press forming process as in the first embodiment. Below, differences between the rocker rear inner member 1 of the second embodiment and the first embodiment will be described.

[0035] [(2) Tailored blank welding process] In the tailored blank welding process, the front blank 25A and the rear blank 26A are tailored blank-welded to form a main body blank 2A having the same shape as that of the first embodiment (see FIG. 6).

[0036] The front blank 25A and the rear blank 26A are blanks for forming the front portion 25 and the rear portion 26 of the main body member 2, respectively, and are sheared after a press forming process to have shapes corresponding to the front portion 25 and the rear portion 26. As an example, the front blank 25A has a substantially rectangular shape, and the rear blank 26A has an L-shape.

[0037] Also, as an example, the material constituting the front blank 25A has a higher tensile strength than the material constituting the rear blank 26A. Specifically, the material constituting the front blank 25A and the rear blank 26A may be, for example, steel or high-tensile steel, more specifically, high-tensile steel having a tensile strength of 590 MPa or more. Furthermore, these materials may be high-tensile steel having a tensile strength of 780 MPa or more. Furthermore, the material constituting the front blank 25A may be high-tensile steel having a tensile strength of 980 MPa or more.

[0038] Of course, the materials constituting the front blank 25A and the rear blank 26A can be determined as appropriate. Specifically, for example, the tensile strength of the material constituting the front blank 25A may be equal to or less than the tensile strength of the material constituting the rear blank 26A.

[0039] [(3) Welding process and press forming process] In the subsequent welding and press forming steps, the rocker rear inner member 1 is formed from the main body blank 2A formed in the tailored blank welding step and the reinforcing blank 3A by patchwork similar to that in the first embodiment.

[0040] That is, in the welding process, as in the first embodiment, a main body blank 2A and a reinforcing blank 3A are welded together to form a joined material 1A (see FIG. 7). At this time, the reinforcing blank 3A is positioned across a TWB (Tailor Welded Blank) line L and joined to a front blank 25A and a rear blank 26A. The TWB line L corresponds to the boundary between the front blank 25A and the rear blank 26A. That is, a HAZ (Heat-Affected Zone) may be formed around the TWB line L when the front blank 25A and the rear blank 26A are welded together.

[0041] Specifically, the rear end of the reinforcing blank 3A (hereinafter, the reinforcing blank rear end 34A) abuts against the rear blank 26A, and a weld 34B near the reinforcing blank rear end 34A is spot-welded to the rear blank 26A. The reinforcing blank rear end 34A corresponds to the reinforcing member rear end 34. In the second embodiment, as an example, two welds 34B are formed at both ends of the reinforcing blank rear end 34A. However, the positions and number of the welds 34B can be determined appropriately. The distance D between the welds 34B and the TWB line L is, for example, 5 mm or more. Of course, this is not a limitation, and the distance D may be less than 5 mm. The reinforcing blank rear end 34A may abut against the front blank 25A, and the weld 34B may be spot-welded to the front blank 25A.

[0042] Then, in the subsequent press forming step, as in the first embodiment, the joining material 1A is subjected to cold press forming, as an example, to form the rocker rear inner member 1 (see FIGS. 8 to 9C).

[0043] [(4) Rear inner rocker component] The rocker rear inner member 1 of the second embodiment has a configuration similar to that of the first embodiment. However, it differs from the first embodiment in that the front portion 25 and the rear portion 26 of the main body member 2 are respectively made of a front blank 25A and a rear blank 26A joined by tailored blank welding (see FIGS. 8 to 9C).

[0044] That is, the TWB line L extending in a direction approximately perpendicular to the extension direction E is located approximately in the center of the main body member 2 in the extension direction E. The front portion 25 is located in front of the TWB line L, and the rear portion 26 is located behind it.

[0045] The reinforcing member 3 is disposed on the inner circumferential surface 27 of the main body member 2 so as to straddle the TWB line L, and is joined to the front portion 25 and the rear portion 26. [3.Effects] (1) According to the first and second embodiments, the main body member 2 and the reinforcing member 3 are welded by patchwork. This prevents a gap from being formed between the inner circumferential surface 27 of the main body member 2 and the reinforcing member 3, thereby improving the total plastic moment of the rocker rear inner member 1. As a result, the collision performance (in other words, strength) of the rocker rear inner member 1 is improved.

[0046] (2) Furthermore, when the reinforcing member 3 is made of high-tensile steel with a tensile strength of 1180 MPa or more, welding a nut or other component to the reinforcing member 3 increases the risk of delayed fracture, so it is necessary to reinforce it using a patch. This increases the weight of the rocker rear inner member 1 and the number of manufacturing processes.

[0047] In contrast, according to the second embodiment, the application of tailored blank welding improves the collision performance of the rocker rear inner member 1, making it possible to configure the reinforcing member 3 from a material with a tensile strength of 980 MPa or less. This reduces the risk of delayed fracture, and eliminates the need for patches even when welding components such as nuts to the reinforcing member 3. This makes it possible to reduce the weight of the rocker rear inner member 1 and the number of manufacturing processes.

[0048] (3) Furthermore, in recent years, the number of vehicles powered by motors has been increasing, and the weight of such vehicles tends to increase due to the influence of batteries, etc., which may increase the load applied to the rocker rear inner member 1 during a collision. In contrast, according to the first and second embodiments, it is possible to achieve both improved collision performance and weight reduction of the rocker rear inner member 1. As a result, it is possible to appropriately deal with the increase in vehicle weight.

[0049] (4) In addition, the main body member 2 of the second embodiment is formed by joining the front blank 25A and the rear blank 26A by tailored blank welding. This allows each portion of the main body member 2 to be made of an appropriate material. This makes it easier to manufacture the rocker rear inner member 1 while suppressing a decrease in collision performance.

[0050] (5) Furthermore, the rear portion 26 of the main body member 2 has a shape in which the width increases and the height increases toward the rear, making press forming more difficult than the front portion 25. In contrast, in the second embodiment, the tensile strength of the material constituting the rear portion 26 is lower than the tensile strength of the material constituting the front portion 25. This facilitates press forming of the rear portion 26, and by forming the main body member 2 by tailored blank welding, the rocker rear inner member 1 can be suitably manufactured. Furthermore, the collision performance of the front portion 25 can be improved.

[0051] (6) In the second embodiment, the reinforcing member 3 is disposed across the TWB line L and is welded to the front portion 25 and the rear portion 26. This allows the welded portion joining the front portion 25 and the rear portion 26 and the HAZ formed around the TWB line L to be suitably reinforced.

[0052] (7) In addition, in the second embodiment, the rocker rear inner member 1 is formed by patchworking the main body blank 2A and the reinforcing blank 3A formed by tailored blank welding. In other words, there is no need to weld the main body member 2 and the reinforcing member 3 together after press forming. Therefore, the effects of deformation due to press forming can be mitigated compared to manufacturing the rocker rear inner member 1 by separately press forming the main body blank 2A and the reinforcing blank 3A to form the main body member 2 and the reinforcing member 3, and then welding the main body member 2 and the reinforcing member 3 together.

[0053] This reduces the margin required for the design value of the rocker rear inner member 1. As an example, when the main body blank 2A and the reinforcing blank 3A are welded together by patchwork, the distance D between the welded portion 34B of the reinforcing blank 3A and the TWB line L can be set to 5 mm or more. In this way, according to the second embodiment, the degree of freedom in designing the rocker rear inner member 1 is improved.

[0054] 4. Other Embodiments (1) The body member that constitutes a part of the body of the vehicle may be configured in the same manner as the rocker rear inner member 1 of the first and second embodiments. Even in such a case, the above-described effects can be obtained.

[0055] (2) Multiple functions of one component in the above embodiments may be realized by multiple components, or one function of one component may be realized by multiple components. Also, multiple functions of multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Also, part of the configuration of the above embodiments may be omitted. Also, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments.

[0056] [5. Correspondence of Wording] In the second embodiment, the front portion 25 and the rear portion 26 correspond to an example of a first portion and a second portion, respectively, and the front blank piece 25A and the rear blank piece 26A correspond to an example of a first plate material and a second plate material, respectively.

[0057] [6. Technical Ideas Disclosed in the Present Specification] [Item 1] A body member that constitutes a part of the body of a vehicle, a main body member and a reinforcing member, which are plate-shaped members; The body member includes: a top plate portion that is a plate-shaped portion extending in the extension direction; First and second side wall portions are wall-like portions protruding from both ends of the top plate portion in a width direction substantially perpendicular to the extension direction and facing each other in the width direction; a first flange portion provided at an end of the first side wall portion opposite the top plate portion and protruding to an opposite side of the second side wall portion; a second flange portion provided at an end of the second side wall portion opposite to the top plate portion and protruding to an opposite side of the first side wall portion, The reinforcing member is joined to the inner peripheral surface of the main body member by patchwork welding, and the top plate portion, the first and second side wall portions, and the first and second flange portions are formed by press molding of the patchwork. Body parts.

[0058] [Item 2] The body member according to item 1, The main body member has a first portion and a second portion which are plate-shaped portions joined by tailored blank welding. Body parts.

[0059] [Item 3] The body member according to item 2, the first portion and the second portion are located on a first end side and a second end side in the extension direction, respectively; the second portion has a length in the width direction that increases toward the second end, The tensile strength of the first portion is higher than the tensile strength of the second plate material. Body parts.

[0060] [Item 4] The body member according to item 2 or 3, The reinforcing member is disposed across the boundary between the first portion and the second portion of the main body member and is joined to the first portion and the second portion. Body parts.

[0061] [Item 5] The body member according to any one of items 1 to 4, The body member is a rocker rear inner member that is mounted on the vehicle with the extension direction substantially coinciding with the front-rear direction of the vehicle. Body parts.

[0062] [Item 6] A method for manufacturing a body member according to item 1, joining the main body member and the reinforcing member by welding the patchwork; performing press forming of the patchwork on the welded main body member and the reinforcing member; A method for manufacturing a body member comprising:

[0063] [Item 7] Item 6. A method for manufacturing a body member according to item 6, The main body member is formed by joining a first plate material and a second plate material, which are plate-shaped members, by tailored blank welding. The method for manufacturing a body member further comprises: [Explanation of symbols]

[0064] B...body, E...extension direction, W...width direction, L...TWB line, 1...rocker rear inner member, 10...rocker rear inner front end, 11...rocker rear inner rear end, 2...main body member, 2A...main body blank, 20...top plate portion, 21...first side wall portion, 22...second side wall portion, 23...first flange portion, 24...second flange portion, 25...front portion, 25A...front blank, 26...rear portion, 26A...rear blank, 27...inner surface, 3...reinforcing member, 3A...reinforcing blank, 30...main body portion, 30A...wide portion, 30B...narrow portion, 31...first side portion, 32...second side portion, 33...reinforcing member front end, 34...reinforcing member rear end, 34A...reinforcing blank rear end, 34B...welded portion.

Claims

1. A body member that constitutes a part of the body of a vehicle, a main body member and a reinforcing member, which are plate-shaped members; The body member includes: a top plate portion that is a plate-shaped portion extending in the extension direction; First and second side wall portions are wall-like portions protruding from both ends of the top plate portion in a width direction substantially perpendicular to the extension direction and facing each other in the width direction; a first flange portion provided at an end of the first side wall portion opposite the top plate portion and protruding to an opposite side of the second side wall portion; a second flange portion provided at an end of the second side wall portion opposite to the top plate portion and protruding to an opposite side of the first side wall portion, The reinforcing member is joined to the inner peripheral surface of the main body member by patchwork welding, and the top plate portion, the first and second side wall portions, and the first and second flange portions are formed by press molding of the patchwork. Body parts.

2. 2. The body member according to claim 1, The main body member has a first portion and a second portion which are plate-shaped portions joined by tailored blank welding. Body parts.

3. 3. The body member according to claim 2, the first portion and the second portion are located at a first end side and a second end side in the extension direction, respectively; the second portion has a length in the width direction that increases toward the second end, The tensile strength of the first portion is higher than the tensile strength of the second plate material. Body parts.

4. The body member according to claim 2 or 3, The reinforcing member is disposed across the boundary between the first portion and the second portion of the main body member and is joined to the first portion and the second portion. Body parts.

5. 3. The body member according to claim 1 or 2, The body member is a rocker rear inner member that is mounted on the vehicle with the extension direction substantially coinciding with the front-rear direction of the vehicle. Body parts.

6. 2. A method for manufacturing a body member according to claim 1, comprising: joining the main body member and the reinforcing member by welding the patchwork; performing press forming of the patchwork on the welded main body member and the reinforcing member; A method for manufacturing a body member comprising:

7. 7. A method for manufacturing a body member according to claim 6, comprising: The main body member is formed by joining a first plate material and a second plate material, which are plate-shaped members, by tailored blank welding. The method for manufacturing a body member further comprises:

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