JP6299456B2 - Body side structure - Google Patents

Description

  The present invention relates to a structure of a side surface of a vehicle body in which a side sill and a pillar base end portion of a vehicle are coupled.

  2. Description of the Related Art Conventionally, a vehicle body side structure is known in which each of a pillar and a side sill of a vehicle body has a closed cross-sectional shape and a base end portion of the pillar is coupled to a side sill. In this type of vehicle body side structure, in order to increase the coupling strength between the pillar and the side sill, the shape of the pillar base end portion is a flared shape that spreads in the vehicle front-rear direction. Moreover, the side surface which faces a vehicle width direction among the skirt spreading shape part of a pillar base end part is extended below along the outer side of a side sill, and is fixed by welding with respect to the outer side of a side sill. On the other hand, an end surface extending in the vehicle width direction from the end in the vehicle front-rear direction at the pillar base end is smoothly connected and fixed to the upper surface of the side sill (see Patent Documents 1 and 2).

  With such a structure, the cross-sectional area of the coupling surface of the pillar and the side sill can be increased, and the rigidity of the pillar base end can be increased. Moreover, the bondability between the pillar and the side sill can be enhanced by welding the pillar base end portion to the upper surface and the side surface of the side sill. Furthermore, by extending the lower end of the skirt-shaped pillar downward along the outside of the side sill, the weld width between the flange and the side sill can be increased in the vehicle front-rear direction, and the connectivity between the pillar and the side sill Can be further enhanced.

JP 2011-143762 Japanese Patent No. 4329379

  However, in the structure described above, the deformation margin of the pillar base end portion is not sufficiently considered, and the pillar and the side sill are rigidly coupled. For this reason, the load tends to concentrate on the welded portion between the pillar and the side sill in the case of a side collision of the vehicle, and peeling may occur depending on the welding strength and the arrangement of the welding location.

  Here, a vehicle body side surface structure in which pillar base end portions are welded at a plurality of locations along the extending direction of the side sill is assumed. In the case of a side collision, the entire pillar is deformed so as to be pushed into the vehicle interior side, the pillar base end is pulled upward, and the side sill is rotated (twisted) in the roll direction. At this time, the tensile stress accompanying said deformation acts on each welding location of a pillar base end part. This stress is most likely to be greatest at weld locations located near both ends in the vehicle front-rear direction, and weld separation is likely to occur at weld locations located at the vehicle front end and the vehicle rear end. When such weld delamination occurs, an excessive load acts on the remaining welding locations, causing delamination in a chained manner, and there is a risk that the vehicle compartment protection performance against side collisions will be greatly reduced.

  In order to solve the above problems, it is conceivable to enlarge the shape of the pillar base end portion and increase the number of welded portions so as to disperse the stress at the time of side collision. For example, the shape of the pillar base end is extended in the vehicle longitudinal direction and the vertical direction, and a welding spot is added to the extended portion. Thereby, the stress which acts per one place of welding becomes small, and it becomes possible to suppress welding peeling. However, in this case, the member size and member weight of the pillar base end portion are increased, press workability is reduced, and the number of welding processes is increased. This is disadvantageous in terms of productivity and cost.

  One of the purposes of this case was created in view of the above-mentioned problems, and can improve the vehicle compartment protection performance against a side collision while reducing the weight and productivity of parts with a simple configuration. It is to provide a vehicle body side structure. It should be noted that the present invention is not limited to this purpose, and is an operational effect that is derived from each configuration shown in “Mode for Carrying Out the Invention” to be described later. Can be positioned as a purpose.

(1) The vehicle body side structure disclosed herein is a vehicle body side structure in which a side sill and a pillar base end portion of a vehicle are coupled. The side sill includes a cylindrical portion having a closed cross-sectional shape disposed in the vehicle front-rear direction, and a flange portion extending upward from the cylindrical portion and facing the vehicle width direction. The pillar base end portion includes a side surface portion, an end surface portion, and a step portion.
The side surface portion is formed in a hem shape in a side view and is fixed to the side surface of the cylindrical portion. On the other hand, the end surface portion extends in the vehicle width direction from the side edge of the side surface portion in the vehicle front-rear direction and is fixed to the flange portion, and the lower end side is formed in a narrow shape in a side view. The step portion is formed in a terrace shape having a step in the plate thickness direction, and is disposed at the lower end portion of the end surface portion.

(2) It is preferable that the said step part is provided at intervals with respect to the upper surface of the said cylinder part.
(3) It is preferable that the lower end side of the end surface portion is formed so as to intersect a boundary line (ridge line, mountain fold line) between the side surface portion and the end surface portion. For example, it is preferable that the pillar base end portion is cut perpendicularly to the boundary line at a position where the boundary line is not horizontal. Note that the term “vertical” as used herein is not limited to a strictly right-angled state but also a substantially vertical state (for example, the lower end side of the end face is cut in a direction perpendicular to, perpendicular to, or substantially perpendicular to the boundary line. For example, an angle within a range of about 45 to 135 °.

(4) It is preferable that the said step part is arrange | positioned along the lower end side of the said end surface part. For example, it is preferable that the step portion is disposed along a direction perpendicular to a boundary line (ridge line or mountain fold line) between the side surface portion and the end surface portion. As a result, the end face portion is imparted with a characteristic that is difficult to deform, and the rigidity against deformation is increased.
(5) Alternatively, it is preferable that the step portion is disposed along a direction perpendicular to a lower end side of the end surface portion. For example, it is preferable that the step portion is disposed along a boundary line (ridge line or mountain fold line) between the side surface portion and the end surface portion. As a result, the end face portion is easily deformed (deformation absorbability), and the crushable region increases.
The step portion may be formed by combining a portion disposed along the lower end side of the end surface portion and a portion disposed along a direction perpendicular to the lower end side of the end surface portion. .

  According to the vehicle body side structure of the disclosure, it is possible to maintain welded state by suppressing welding separation between the side sill and the pillar base end portion without increasing the component size and weight, and increasing the vehicle body strength. it can. Therefore, it is possible to improve the vehicle compartment protection performance against a side collision while reducing the weight and improving the productivity with a simple configuration.

It is a figure which shows the vehicle to which the vehicle body side structure as an Example was applied. It is a disassembled perspective view which shows a vehicle body side structure typically. (A) is a perspective view which shows a pillar base end part, (B) is the side view. (A), (B) is a longitudinal cross-sectional view [AA cross-sectional view of FIG. 3 (B), BB cross-sectional view] of a pillar base end part. (A), (B) is a perspective view which shows the pillar base end part in the vehicle body side surface structure as a modification.

  A vehicle body side structure as an embodiment will be described with reference to the drawings. The embodiment described below is merely an example, and there is no intention of excluding various modifications and technical applications that are not explicitly described in the following embodiment. Each configuration of the present embodiment can be implemented with various modifications without departing from the spirit of the present embodiment, and can be selected or combined as necessary.

[1. Vehicle configuration]
The vehicle body side surface structure of the present embodiment is applied to the connecting portion between the side sill 9 and the center pillar 11 (B pillar) in the monocoque vehicle body structure of the vehicle 10 shown in FIG. The center pillar 11 is a structure provided in the up-down direction by connecting between the roof side rail 13 and the side sill 9. The side sill 9 is a structure that extends in the vehicle front-rear direction below the outer surface of the vehicle 10 and is a portion that forms a lower frame of the door opening. Similarly, the roof side rails 13 are structures provided on the left and right ends of the ceiling surface of the vehicle 10 and form an upper frame of the door opening. The center pillar 11, the side sill 9, and the roof side rail 13 are preferably formed in a closed cross-sectional structure.

  Front pillars 14 (A pillars) are provided at the vehicle front end portions of the side sill 9 and the roof side rail 13, and rear pillars 15 (C pillars) are provided at the vehicle rear end portions of the side sill 9 and the roof side rail 13. As a result, an annular side frame structure surrounded by the side sill 9, the roof side rail 13, the front pillar 14, and the rear pillar 15 is formed around the door opening of the vehicle 10, and the center pillar 11 is vertically disposed inside thereof. Arranged in the direction.

[2. Pillar, side sill]
FIG. 2 is an exploded perspective view schematically showing the side structure of the vehicle body. The center pillar 11 and the side sill 9 are both provided on the vehicle inner side (inner side in the vehicle width direction) of the outer panel 1 that is an exterior panel of the vehicle 10. The outer panel 1 is provided with a pillar portion 1a whose horizontal cross-sectional shape bulges toward the vehicle outer side and a sill portion 1b whose vertical cross-sectional shape bulges toward the vehicle outer side. The pillar portion 1a is an exterior panel of the center pillar 11 and extends in the vertical direction on the side surface of the vehicle. The sill portion 1b is an exterior panel of the side sill 9, and extends in the vehicle front-rear direction (horizontal direction) at the lower end of the pillar portion 1a.

  A pillar inner member 2 and a pillar reinforcement member 3 are disposed inside the pillar portion 1a. These horizontal cross-sectional shapes are, for example, a hat shape in which the pillar inner member 2 protrudes toward the inside of the vehicle, and a hat shape in which the pillar reinforcement member 3 protrudes toward the outside of the vehicle. That is, it is the shape which extended the flange surface (edge end surface) perpendicularly from the both ends in the groove member of a U-shaped cross section. By superimposing these flange surfaces and fixing them by spot welding, laser welding or the like, a hollow closed section skeleton extending in the vertical direction is formed.

  Similarly, the side sill inner member 4 and the side sill reinforcement member 5 are arrange | positioned inside the sill part 1b. These vertical cross-sectional shapes are, for example, a hat type in which the side sill inner member 4 protrudes toward the inside of the vehicle, and a hat type in which the side sill reinforcement member 5 protrudes toward the outside of the vehicle. By superimposing these flange surfaces and fixing them by spot welding, laser welding or the like, a hollow closed cross-section skeleton extending in the vehicle front-rear direction is formed.

  Here, as shown in FIG. 3A, the cylindrical portion formed by combining the side sill inner member 4 and the side sill reinforcement member 5 is referred to as a cylindrical portion 6 of the side sill 9. The cylinder part 6 is arrange | positioned in the vehicle front-back direction. The cross-sectional shape of the cylindrical portion 6 is a rectangular shape surrounded by the upper surface 6a, the lower surface 6b, the outer surface 6c, and the inner surface 6d. In addition, a flange portion 7 extending upward is provided on the upper surface 6 a of the cylindrical portion 6. The flange portion 7 is arranged in a direction facing the vehicle width direction (that is, a direction (normal direction) perpendicular to the surface of the flange portion 7 faces the vehicle width direction outside or the vehicle width direction inside). The

[3. Pillar base end]
Hereinafter, the base end portion of the pillar reinforcement member 3 is referred to as a pillar base end portion 8. The pillar base end portion 8 is fixed to the cylinder portion 6 and the flange portion 7 of the side sill 9 by welding. Here, a perspective view of a state in which the pillar base end portion 8 is cut horizontally is shown in FIG. Here, the description of the pillar inner member 2 is omitted. The general shape of the horizontal cross section of the pillar base end portion 8 is a hat shape that protrudes outward in the vehicle width direction, as shown in FIG. The pillar base end portion 8 is provided with a side surface portion 8a, an end surface portion 8b, and a step portion 8c.

  The side surface portion 8a is a planar portion that extends in the vertical direction in a posture facing the vehicle width direction along the surface of the pillar portion 1a inside the pillar portion 1a. In FIG. 3 (A), only the lower end portion of the pillar reinforcement member 3 is shown, but the actual side surface portion 8a extends upward from the portion shown in FIG. 3 (A). As shown in FIG. 3B, the shape of the side surface portion 8a in the side view of the vehicle is a hem-widening shape in which the lower side on the base end side is widened in the vehicle front-rear direction. Thereby, the rigidity with respect to bending deformation is ensured.

  The ridgeline R (the boundary line between the side surface portion 8a and the end surface portion 8b, the mountain fold line) that is the front-rear direction edge of the side surface portion 8a may be formed in a straight line shape or a broken line shape, or a curved shape that is gently bent. You may form in. In the present embodiment, the two ridge lines R form an eight-shape when viewed from the side, and are arranged so as to widen toward the lower side. In addition, the inclination at the lower end of the ridge line R is obliquely downward (that is, a direction slightly downward from the horizontal). A plurality of shallow uneven shapes formed on the surface of the side surface portion 8a in FIGS. 3A and 3B are processed in order to increase the rigidity against bending deformation of the side surface portion 8a.

As shown in FIGS. 4A and 4B, the lower side 8d of the side surface 8a is extended to a position where at least the lower end of the side 8a reaches the outer surface 6c of the cylindrical portion 6, and there are a plurality of lower sides 8c. It is at the welding point W ₁ welded. These welding points W ₁ is a substantially uniform spacing (horizontal direction as viewed from the side) longitudinal vehicle direction, are arranged in a row along the bottom edge of the side surface portion 8a. The outermost position of the welding point W ₁ of these welding points W _1, as shown in FIG. 3 (A), (B) , the vehicle near the front end and the rear end near the front-rear direction at the lower end of the side surface portion 8a Set to

The end surface portion 8 b is a planar portion that extends from the ridge line R that is the vehicle longitudinal direction end side of the side surface portion 8 a toward the vehicle width direction (vehicle inner side) and is fixed to the flange portion 7. As shown in FIG. 3A, these end surface portions 8b are provided with end surface flanges 8e and end surface inclined surfaces 8f.
The end surface flange 8e is a portion that is disposed at the end of the end surface portion 8b in the vehicle front-rear direction and is fixed to the flange portion 7 by welding, and is formed in a surface that is substantially parallel to the side surface portion 8a. The end face flange 8e is formed so as to overlap the flange portion 7 at least the side view, the position of the welding point W ₂ is set into the polymerization range of the end face flanges 8e and the flange portion 7. FIG. 3 (A), illustrates what welding point W ₂ is set in (B), near the lower end of the end face flanges 8e.

  On the other hand, the end surface slope 8f is a surface adjacent to the side surface portion 8a via the ridge line R, and is a curved surface (or a bent flat surface) portion connecting the side surface portion 8a and the end surface flange 8e. The vehicle width direction dimension of the end surface portion 8 b is set to be substantially the same as the horizontal distance from the outer surface 6 c of the cylindrical portion 6 to the flange portion 7. The lower end sides of these end surface portions 8b (end surface flange 8e, end surface inclined surface 8f) are formed in a skirt-narrow shape that becomes narrower downward as viewed from the side. That is, the end surface portion 8b on the front side of the vehicle is formed such that the plate terminal faces obliquely downward on the front side of the vehicle, and the end surface portion 8b on the vehicle rear side faces diagonally downward on the rear side of the vehicle. It is formed to be a posture. In addition, the angle of the plate end of the end surface portion 8b is about 30 to 60 °, preferably about 45 ° with respect to the horizontal plane in a side view.

The broken line in FIG. 3 (B) is a line which shows the example of the outline shape of the base end part of the conventional pillar as described in the above-mentioned patent documents 1 and 2. The pillar base end portion 8 of the present embodiment has an end portion in the vehicle front-rear direction cut obliquely than that indicated by the broken line. That is, the lower end side of the end surface portion 8b located on the vehicle front side is formed in a shape cut along a straight line L extending rearward and downward of the vehicle. On the other hand, the lower end side of the end surface portion 8b located on the vehicle rear side is cut out along a straight line M extending forward and downward of the vehicle. The side surface portion 8a is formed such that the ridge line R intersects the straight lines L and M substantially perpendicularly. Thereby, a posture that the lower end edge of the end surface portions 8b is facing downward of the vehicle body, a plurality of welding points W ₁ is arranged inside the vehicle longitudinal direction than the two welding points W _2. Note that the ridge line R does not have to be strictly perpendicular to the straight line L and the straight line M. The angle formed between the ridgeline R, the straight line L, and the straight line M may be arbitrarily set within a range of about 45 to 135 °, for example, according to the member performance desired to be secured at the pillar base end 8.

  The lower end of the end surface portion 8b is provided at a distance from the upper surface 6a so that the end surface portion 8b is separated from the upper surface 6a of the cylindrical portion 6 and floats in the air. Thereby, a gap surrounded by four sides of the upper surface 6a, the flange portion 7, the side surface portion 8a, and the end surface portion 8b of the cylindrical portion 6 is formed below the end surface portion 8b. The gap functions as a deformation allowance that can absorb the deformation of the pillar base end portion 8 with respect to the torsional deformation of the side sill 9. On the other hand, if there is a gap at the joint portion between the pillar base end portion 8 and the side sill 9, deformation of the joint portion is allowed, but rigidity can be lowered. Therefore, in the present embodiment, the step portion 8c is formed at the lower end portion of the end surface portion 8b to make up for the reduction in rigidity.

  As shown in FIGS. 3A and 3B, the step portion 8c is formed in a terrace shape (step shape) by providing a step in the thickness direction by pressing the lower end portion of the end surface slope 8f. . The concavo-convex shape of the step portion 8c may be a shape that is recessed below the end surface slope 8f, or may be a shape that protrudes above the end surface slope 8f. The step portion 8c of the present embodiment is provided so as to connect the side surface portion 8a and the end surface flange 8e, and is disposed at a position serving as an upper frame of the gap. By providing the step portion 8c, the end surface slope 8f is less likely to be crushed in the vehicle width direction, and the rigidity of the joint portion between the pillar base end portion 8 and the side sill 9 is improved.

[4. Action, effect]
(1) In the above-described vehicle body side surface structure, as shown in FIG. 3B, the side surface portion 8a of the pillar base end portion 8 is formed in a flared shape in a side view. On the other hand, the end surface portion 8b extending from the end side in the vehicle width direction is formed such that the lower end side is narrowed. Compared with the base end portion of the conventional pillar as shown by the broken line in FIG. 3B, the member dimension in the vehicle front-rear direction is shortened. Thereby, stress concentrates in the case of a side collision, and the part which was easy to produce a welding fracture is cut (omission), and it can control that exfoliation in a welding part arises.

  Further, by shortening the dimension of the vehicle in the longitudinal direction of the vehicle, the welding spot, the size of the member and the weight of the member can be reduced, and the productivity of the pillar reinforcement member 3 can be reduced and the productivity can be improved. In addition, since the size in the longitudinal direction of the vehicle is reduced, it is possible to reduce the unused portion of the material generated when press-molding a plurality of pillar reinforcement members 3 from a single steel plate, thereby improving the yield. be able to.

  On the other hand, a terrace-shaped step portion 8c having a step in the thickness direction is provided at the lower end portion of the end surface portion 8b. Thereby, the rigidity of the end surface portion 8b is enhanced, and the end surface portion 8b is given a characteristic that is difficult to be deformed at the time of a side collision. Therefore, even if the joint area (welding point) of the pillar base end portion 8 is reduced, the vehicle body strength at the joint portion between the pillar base end portion 8 and the side sill 9 can be increased. Thus, according to the vehicle body side structure described above, it is possible to improve the vehicle compartment protection performance against a side collision while reducing the weight of the pillar reinforcement member 3 and improving the productivity with a simple configuration.

  (2) In the vehicle body side structure described above, the step portion 8 c is provided with a space from the upper surface 6 a of the cylindrical portion 6. Accordingly, a gap can be formed below the end surface portion 8b, a deformation allowance for the torsional deformation of the side sill 9 can be secured, and the deformation of the pillar base end portion 8 can be absorbed to fix the side surface portion ( It is possible to increase the effect of suppressing the peeling of the welded portion). On the other hand, the decrease in rigidity due to the formation of the gap can be compensated by providing the step portion 8c directly above the gap. Therefore, it is possible to easily adjust the balance between the strength against the side collision and the deformation tolerance.

(3) In the vehicle body side structure described above, the lower end side of the end surface portion 8b is formed so as to intersect the ridgeline R. For example, the ridge line R corresponding to the end side of the side surface portion 8a and the straight line L (straight line M) corresponding to the lower end side of the end surface portion 8b intersect each other at a substantially right angle. Thereby, the stress transmitted along the ridgeline R is easily dispersed to the side surface portion 8a and the end surface portion 8b. Therefore, among the plurality of welding points W ₁ for fixing the side portion 8a and the cylindrical portion 6, the vehicle front-rear can be suppressed stress concentration in the direction of the location where most are located outside, separation preventing fixed (welded) The effect can be enhanced and the vehicle compartment protection performance against side collision can be improved.

  (4) In the vehicle body side structure described above, as shown in FIGS. 3A and 3B, the step portion 8c is disposed along the lower end side of the end surface portion 8b, and the side surface portion 8a and the end surface flange 8e It is provided to connect the gaps. Thereby, the end surface slope 8f can be made difficult to be crushed in the vehicle width direction, and the rigidity of the lower end side of the end surface portion 8b can be further increased. Moreover, the approach speed of the vehicle body side surface at the time of a side collision can be reduced, and a passenger | crew protection performance can be improved.

  (5) In recent years, the strength and weight of the vehicle body structural member have been increased, and high-tensile steel plates are being adopted. On the other hand, the base end portion of the conventional pillar as shown by the broken line in FIG. 3B has a generally T-shaped contour shape, and is generally closed using a T-shaped mold. Manufactured after being pressed by the draw method. However, when a high-strength steel sheet is processed by the closed draw method, the inflow direction of the material during the pressing process is likely to be complicated, and there is a drawback that cracks and wrinkles are likely to occur. Therefore, it has been difficult to apply a high-strength steel plate to the base end portion of the conventional pillar.

  On the other hand, in the vehicle body side structure described above, since the dimension of the member in the vehicle front-rear direction is shortened, it can be manufactured by press working by an open draw method using an I-shaped mold. In this case, the inflow direction of the material during the pressing process is simplified (becomes almost constant), and cracks and wrinkles are less likely to occur. Therefore, the vehicle body side structure has advantages that a high-strength steel plate is easy to apply, and that it is easy to reduce the thickness of the member by reducing the plate thickness.

[5. Modified example]
Regardless of the above embodiment, various modifications can be made without departing from the spirit of the invention. Each structure of this embodiment can be selected as needed, or may be combined appropriately.
In the above-described embodiment, the vehicle body side surface structure in which the pillar inner member 2, the pillar reinforcement member 3, the side sill inner member 4, and the side sill reinforcement member 5 are provided inside the outer panel 1 is illustrated. The structure of 11 and the side sill 9 is not limited to this. The vehicle body side structure can be applied to any vehicle 10 having a structure that fixes at least the pillar base end portion 8 to the side sill 9. In addition, this vehicle body side structure is applicable also to the base end part of pillars, such as the front pillar 14 and the rear pillar 15. FIG.

  Moreover, although the step part 8c was illustrated along the lower end side of the end surface part 8b in the above-mentioned embodiment, the arrangement | positioning method of the step part 8c is not limited to this. For example, when it is desired to further increase the rigidity at the joint portion of the pillar base end portion 8 and the side sill 9, a plurality of steps are provided between the ridgeline R of the side surface portion 8a and the end surface flange 8e as shown in FIG. The part 8c may be bridged. Thereby, the approach speed to the indoor side of the center pillar 11 at the time of a side collision can be delayed, and the passenger compartment protection performance can be improved.

  Alternatively, as shown in FIG. 5B, the step portion 8c may be disposed along a direction perpendicular to the lower end side of the end surface portion 8b (that is, parallel to the ridgeline R). Thereby, the amount of crushing of the end surface slope 8f at the time of a side collision increases, and the crushable area increases, so that the vehicle compartment protection performance can be improved. 5A and 5B, stepped portions 8c as shown in each of FIGS. 5A and 5B may be combined to arrange terrace-shaped portions vertically and horizontally, or a grid-like uneven shape surrounded by a plurality of terraces. May be formed. The specific shape and arrangement of the step portion 8c can be set according to the rigidity and deformation tolerance required for the pillar base end portion 8.

In the above-described embodiment, the structure in which the step portion 8c is provided with an interval with respect to the upper surface 6a of the cylindrical portion 6 has been described. However, the “interval” here can be made as small as possible, and at least The step part 8c (the lower end side of the end surface part 8b) and the upper surface 6a of the cylinder part 6 may be in a state of being cut off. Incidentally, the welding point W _1, W ₂ of the above embodiments, while indicating welded portions of the member, the shape of the weld is not limited thereto. The same applies to the member fixing method, and the member may be fixed using a method other than spot welding or laser welding (for example, pressure welding or fusion welding).

6 cylinder portion 6a upper surface 6c outer side surface 7 flange portion 8 pillar base end portion 8a side surface portion 8b end surface portion 8c step portion 8d lower side portion 8e end surface flange 8f end surface slope 9 side sill 11 center pillar R ridge line

Claims (5)

A vehicle body side structure in which a side sill of a vehicle and a pillar base end are coupled,
The side sill is
A cylindrical section having a closed cross-sectional shape arranged in the longitudinal direction of the vehicle;
A flange portion extending upward from the tubular portion and facing the vehicle width direction, and
The pillar base end portion is
A side surface portion formed in a hem-expanded shape in a side view and fixed to a side surface of the cylindrical portion;
An end surface portion that extends in the vehicle width direction from the side edge in the vehicle front-rear direction of the side surface portion and is fixed to the flange portion, and has a lower end side that is formed in a skirt narrow shape in a side view;
A vehicle body side structure comprising: a step portion formed in a terrace shape having a step in a plate thickness direction and disposed at a lower end portion of the end surface portion. The vehicle body side structure according to claim 1, wherein the step portion is provided at an interval from an upper surface of the cylindrical portion. The vehicle body side structure according to claim 1, wherein a lower end side of the end surface portion is formed to intersect a boundary line between the side surface portion and the end surface portion. The vehicle body side structure according to any one of claims 1 to 3, wherein the step portion is disposed along a lower end side of the end surface portion. The vehicle body side structure according to any one of claims 1 to 4, wherein the step portion is disposed along a direction perpendicular to a lower end side of the end surface portion.

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