JP2016222106A - Vehicle side part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle side part structure which can enhance vehicle-body torsion rigidity around a shaft extending to a vehicle width direction in addition to the rigidity of a corner of a door opening of a vehicle side face at a lower rear side.SOLUTION: A vehicle side part structure 100 comprises a side sill 112 which extends to a vehicle fore-and-aft direction at a lower part of a door opening 106 of a vehicle side face 104, and an arch-shaped rear wheel house 114 which is connected to a rear end 120 of the side sill, and accommodates a rear wheel of the vehicle. One or more of longitudinal first ridge line 128 are formed at the side sill, a cross section area of the side sill is increased as approximating the rear end of the side sill, one or more of arch-shaped second ridge line 134 are formed at the rear wheel house, and the first ridge lines are continuous to the second ridge lines which are ridge-folded or valley-folded similar to the first ridge lines.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle side part structure including a side sill and a rear wheel house which are coupled at a lower rear corner of a door opening provided on a side surface of a vehicle.

  A side opening of a vehicle such as an automobile is provided with a door opening to which a rear door or the like is attached. A side sill and a rear wheel house are coupled to each other at a corner on the rear side of the vehicle in a lower portion of the door opening. The side sill extends in the vehicle front-rear direction below the door opening. The rear wheel house is formed in an arch shape so as to accommodate the rear wheel of the vehicle, and is coupled to the rear end of the side sill.

  Patent Document 1 describes a vehicle body structure provided with an attachment portion for attaching a trailing arm of a rear wheel suspension. The attachment portion is disposed in the vicinity of the rear end of the side sill located at the lower rear corner of the door opening, and includes a convex first protrusion that accommodates the front end portion of the trailing arm. The mounting portion further includes a first inclined portion positioned on the vehicle front side of the first protrusion, a second inclined portion positioned on the vehicle rear side of the first protrusion, and a first inclined portion positioned on the vehicle front side of the first inclined portion. 2 protrusions.

  In Patent Document 1, the first inclined portion and the second inclined portion are positioned on the front and rear sides of the first projecting portion to increase the rigidity of the mounting portion. Further, the load at the time of the front impact is increased by the second projecting portion and the first inclined portion. It can be smoothly transmitted from the mounting portion to the second inclined portion.

JP 2013-129207 A

  The lower rear corner of the vehicle door opening is where the side sill and the rear wheel house are joined, so it deforms to twist when it receives a load around the axis extending in the vehicle width direction when traveling. There is a case. On the other hand, Patent Document 1 only discloses a configuration that smoothly transmits the load at the time of the front collision, and the lower rear of the door opening due to the load input to the mounting portion during traveling or the like. No consideration is given to the point where the side corners are deformed.

  In view of such a problem, the present invention provides a vehicle side part structure that can enhance the torsional rigidity of a vehicle body around an axis extending in the vehicle width direction in addition to the rigidity of the lower rear corner of the door opening on the side surface of the vehicle. The purpose is that.

  In order to solve the above problems, a typical configuration of a vehicle side part structure according to the present invention includes a side sill that extends in the vehicle front-rear direction at a lower portion of a door opening on the side of the vehicle, and a rear sill coupled to the rear end of the side sill. In a vehicle side part structure including an arched rear wheel house that accommodates a wheel, the side sill is formed with one or more first ridge lines that are longitudinal in the vehicle front-rear direction, and the cross-sectional area of the side sill is As it approaches the end, the rear wheel house has one or more arch-shaped second ridge lines, and each first ridge line has a mountain fold shape or a valley fold in the same manner as each first ridge line. It is characterized by being continuous with each second ridge line in the shape.

  According to the above configuration, the cross-sectional area of the side sill coupled to the wheel house at the lower rear corner of the rear door opening increases as the side sill approaches the rear end of the side sill, that is, as the lower rear corner of the door opening approaches. . Therefore, the rigidity of the lower rear corner is increased. Furthermore, since the first ridge line and the second ridge line are continuous, the shapes of the side sill and the rear wheel house are continuous at the lower rear corner of the door opening having increased rigidity. Therefore, not only the rigidity of the lower rear corner of the door opening is increased, but also the rigidity around the axis passing through the lower rear corner and extending in the vehicle width direction (body torsional rigidity) can be increased.

  The side sill includes a side sill outer panel in which one or more first ridge lines are formed, and a side sill inner panel coupled to the vehicle interior side of the side sill outer panel. And a bracket that covers the vehicle exterior side of the attachment portion and is coupled to the rear end of the side sill inner panel, and a reinforcement that connects the rear end of the side sill inner panel and the rear end of the side sill outer panel.

  According to this configuration, the bracket that covers the vehicle exterior side of the attachment portion is coupled to the rear end of the side sill inner panel and further connected to the rear end of the side sill outer panel via the reinforcement. Therefore, the load input to the attachment part to which the suspension is attached is transmitted not only to the side sill inner panel to which the bracket is directly coupled, but also to the side sill outer panel in which the first ridge line is formed via the reinforcement. To be dispersed. Therefore, the rigidity of the attachment portion to which the suspension is attached can be increased.

  Said reinforcement is good to be flat at least between the rear end of the side sill inner panel and the rear end of the side sill outer panel. As a result, the rear end of the side sill inner panel and the rear end of the side sill outer panel are connected linearly. Therefore, the load input to the attachment portion to which the suspension is attached is more efficiently transmitted to the side sill outer panel.

  Said reinforcement is good to block the opening of the rear end of the side sill. In this way, the reinforcement not only simply connects the rear ends of the side sill inner panel and the side sill outer panel, but also closes the opening of the rear end of the side sill. Accordingly, the reinforcement also functions as a bulkhead for the cross section of the side sill, and can suppress deformation of the cross section of the side sill.

  The side sill outer panel has a trapezoidal cross section that protrudes to the outside of the vehicle, and the one or more first ridge lines include a valley-folded inner ridge line that passes through the vehicle inner end point on the upper side of the trapezoidal cross section, and The inner ridge line is a ridge line that begins to curve upward from a predetermined first change point, and the outer ridge line is behind the side sill than the first change point. A ridgeline that begins to curve upward from a predetermined second change point close to the end, and the vehicle side part structure includes a first bulkhead that extends in the vehicle vertical direction inside the side sill at the first change point, It is preferable to further include a second bulkhead that is passed in the vertical direction of the vehicle inside the side sill at the two change points.

  Thereby, a bulkhead is each arrange | positioned in the 1st change point of the inner side ridgeline and the 2nd change point of an outer side ridgeline which the magnitude | size of the cross section of a side sill changes among the insides of a side sill. For this reason, the inside of a side sill is reinforced and it becomes difficult to deform | transform, and rigidity can be improved.

  The reinforcement, the first bulkhead, and the second bulkhead may be arranged at substantially equal intervals. As a result, the reinforcing members are arranged at substantially equal intervals at the rear end of the side sill, at the first change point of the inner ridge line, and at the second change point of the outer ridge line, so that the rigidity can be further increased. .

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle side part structure which can improve the torsional rigidity of the vehicle body around the axis | shaft extended in a vehicle width direction can be provided in addition to the rigidity of the corner of the lower rear side of the door opening of a vehicle side surface.

It is a figure which shows the vehicle to which the vehicle side part structure in this embodiment is applied. It is a figure which expands and shows the A area | region of the vehicle side part structure of FIG. FIG. 3 is a B arrow view of the vehicle side part structure of FIG. 2. It is a figure which shows CC cross section of the vehicle side part structure of FIG. It is a figure which shows the internal structure of the side sill of the vehicle side part structure of FIG. It is a figure which shows each cross section of the side sill of the vehicle side part structure of FIG. It is a figure which shows the vehicle side part structure of the comparative example compared with this embodiment. It is a figure which shows the KK cross section of the vehicle side part structure of FIG. It is a figure which shows each rigidity of this embodiment and a comparative example. It is a figure which shows roughly the measuring method of each rigidity of this embodiment and a comparative example.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a diagram showing a vehicle to which a vehicle side part structure in the present embodiment is applied. In the drawing, the vehicle side surface on the left side of the vehicle is viewed from the outside of the vehicle. Hereinafter, the arrow X shown in each figure indicates the front of the vehicle, and the arrow Y indicates the outside of the vehicle.

  The vehicle side part structure 100 is applied to a corner 108 of a door opening 106 provided on the vehicle side surface 104 of the vehicle 102. A corner 108 of the door opening 106 is located on the vehicle rear side of the lower part of the door opening 106, and the vehicle outer side is covered with a side body outer panel 110 in the drawing. Since the present embodiment is a four-door type vehicle 102, the door opening 106 means a rear door opening, but is not limited thereto, and may be a door opening of a two-door type vehicle.

  FIG. 2 is an enlarged view showing a region A of the vehicle side part structure 100 of FIG. In the drawing, the side body outer panel 110 is omitted. The vehicle side part structure 100 includes a side sill 112 and a rear wheel house 114 that are coupled to each other at a corner 108 of the door opening 106. The side sill 112 extends in the vehicle front-rear direction below the door opening 106, and includes a side sill outer panel 116 on the vehicle outer side and a side sill inner panel 118 coupled to the vehicle inner side of the side sill outer panel 116. The rear wheel house 114 is coupled to the rear end 120 of the side sill 112, has an arch shape so as to accommodate a rear wheel (not shown) of the vehicle, and has a rear wheel house outer panel 122 outside the vehicle.

  The side sill outer panel 116 is formed with a first ridgeline 128 including an inner ridgeline 124 and an outer ridgeline 126 that are long in the vehicle longitudinal direction. The rear wheel house outer panel 122 is formed with a second ridge line 134 including an upper ridge line 130 that continues to the inner ridge line 124 and a lower ridge line 132 that continues to the outer ridge line 126.

  FIG. 3 is a B arrow view of the vehicle side part structure 100 of FIG. However, in FIG. 3, the rear wheel house outer panel 122 is omitted. FIG. 4 is a view showing a CC cross section of the vehicle side part structure 100 of FIG. 2.

  As shown in FIG. 3, the vehicle side part structure 100 further includes a suspension mounting part 136, an outer bracket 138, and a rear wheel house front reinforcement (hereinafter, reinforcement 140). The suspension attachment part 136 attaches the trailing arm 142 which is a part of the suspension shown by the chain line in FIG. The outer bracket 138 covers the vehicle exterior side of the suspension attachment portion 136 and is coupled to the rear end 144 of the side sill inner panel 118 as shown in FIG.

  As shown in FIG. 4, the reinforcement 140 has a flat plate shape between the rear end 144 of the side sill inner panel 118 and the rear end 146 of the side sill outer panel 116, and the rear ends 144 and 146 are linearly connected. Connected. An opening 148 of the rear end 120 of the side sill 112 is located between the rear ends 144 and 146. That is, the opening 148 is closed by the flat plate-like reinforcement 140 shown in FIG.

  The reinforcement 140 is fastened together with the side sill inner panel 118 and the outer bracket 138 in the region D shown in FIG. 4, and is fastened together with the side sill outer panel 116 and the rear wheel house outer panel 122 in the region E.

  FIG. 5 is a diagram showing the internal structure of the side sill 112 of the vehicle side part structure 100 of FIG. In the drawing, the side sill outer panel 116 itself is omitted while the inner ridge line 124 and the outer ridge line 126 of the first ridge line 128 formed on the side sill outer panel 116 are shown.

  The inner ridgeline 124 of the side sill outer panel 116 has a valley fold shape that starts to curve upward from the first change point F (see FIG. 5) along the inner edge 152 of the predetermined surface 150 shown in FIG. Yes. The outer ridge line 126 has a mountain fold shape that starts to curve upward from the second change point G (see FIG. 5) along the outer edge 154 of the predetermined surface 150. The second change point G is closer to the rear end 146 of the side sill outer panel 116 than the first change point F is.

  Note that the upper ridge line 130 and the lower ridge line 132 included in the second ridge line 134 of the rear wheel house outer panel 122 shown in FIG. 2 are the valley fold / mountain similarly to the inner ridge line 124 and the outer ridge line 126 of the first ridge line 128, respectively. It has a fold shape and is continuous with each of them. That is, the ridge lines 124 and 130 in the valley fold shape are continuous and the ridge lines 126 and 132 in the mountain fold shape are continuous, so that the entire shape of the side sill 112 and the rear wheel house 114 is continuous. The ridgelines of valley folds and mountain folds do not continue. The ridge line in the present embodiment is a fold line formed when a member such as a panel is bent. Further, the ridge line generally means a mountain-folded fold line, but in this embodiment, the valley-folded fold line is also referred to as a ridge line for convenience.

  The vehicle side part structure 100 is further provided with the 1st bulkhead 156 and the 2nd bulkhead 158 as a reinforcement member, as shown in FIG. The first bulkhead 156 is passed in the vehicle vertical direction inside the side sill 112 at the first change point F. The second bulkhead 158 is passed in the vehicle vertical direction inside the side sill 112 at the second change point G. Further, the distance (dimension La) between the first bulkhead 156 and the second bulkhead 158 is substantially equal to the gap (dimension Lb) between the second bulkhead 158 and the reinforcement 140. Therefore, the first bulkhead 156, the second bulkhead 158, and the reinforcement 140 are arranged at substantially equal intervals. A jack-up point 160 is set between the first bulk head 156 and the second bulk head 158.

  Here, the first change point F and the second change point G are points at which the inner ridge line 124 and the outer ridge line 126 begin to bend upward as they go, for example, toward the rear of the vehicle. Therefore, the size of the cross section (see FIG. 6) of the side sill 112 changes from the first change point F and the second change point G toward the rear of the vehicle.

  FIG. 6 is a view showing each cross section of the side sill 112 of the vehicle side part structure 100 of FIG. In the drawing, in addition to the side sill outer panel 116 and the side body outer panel 110 omitted in FIG. 5, a rear floor panel 162 constituting the floor of the rear part of the vehicle and a side member 164 extending in the vehicle front-rear direction below the rear floor panel 162 are also shown. Yes. The side sill 112 extends on the vehicle outer side of the side member 164 in the vehicle front-rear direction.

  FIG. 6A is a cross-sectional view taken along line HH passing through the first change point F, and the first bulkhead 156 is omitted. The side sill outer panel 116 is bent to the vehicle inner side from the predetermined surface 150, a side surface 166 extending from the predetermined surface 150 to bend the vehicle downward with the outer edge line 126 as a boundary, and an edge 168 of the side surface 166 on the vehicle lower side. And a lower surface 170 extending in the form of a trapezoidal section that protrudes outward from the vehicle.

  The predetermined surface 150 is the upper side of the trapezoidal cross section, and is an inclined surface that is inclined downward toward the vehicle exterior as shown in the figure. Here, the inner ridge line 124 is a ridge line having a valley fold shape passing through the vehicle inner edge 152 of the surface 150 serving as the vehicle inner end point of the upper side. The outer ridge line 126 is a mountain-folded ridge line passing through the vehicle outer edge 154 of the surface 150 serving as the vehicle outer end point of the upper side.

  Further, the side sill outer panel 116 includes an upper flange 172 projecting upward from the predetermined surface 150 with the inner ridge line 124 as a boundary, and a lower flange 176 projecting downward from the vehicle inner edge 174 of the lower surface 170 to the vehicle lower side. In the side sill 112, the upper flange 172 and the lower flange 176 of the side sill outer panel 116 are joined to the upper flange 178 and the lower flange 180 of the side sill inner panel 118, respectively, and a closed cross section shown in the HH cross section of FIG. Is made.

  FIG. 6B is a cross-sectional view taken along the line II passing through the second change point G, and the second bulkhead 158 is omitted. At least the inner ridge line 124 is located above the position of the first change point F on the II line passing through the second change point G. For this reason, the predetermined surface 150 is located above the position of the first change point F. Therefore, the cross section of the side sill 112 is larger in the II cross section in FIG. 6B than in the HH cross section in FIG.

  FIG. 6C is a cross-sectional view taken along line JJ passing near the rear end 120 of the side sill 112. The inner ridge line 124 and the outer ridge line 126 are located above the position of the second change point G on the JJ line. For this reason, the predetermined surface 150 is located above the position at the second change point G. Therefore, the cross section of the side sill 112 is larger in the JJ cross section in FIG. 6C than in the II cross section in FIG. That is, the side sill 112 is curved upward as the first ridgeline 128 goes to the rear of the vehicle, and as a result, the cross-sectional area of the closed cross section increases as the cross section of FIG.

  FIG. 7 is a view showing a vehicle side part structure 200 of a comparative example compared with the present embodiment. FIG. 8 is a view showing a KK cross section of the vehicle side part structure 200 of FIG. In the vehicle side part structure 200, as shown in FIG. 7, the two ridge lines 204 and 206 formed on the side sill outer panel 202 are not curved upward toward the vehicle rear side.

  In the vehicle side part structure 200, the ridge lines 204 and 206 simply extend in the vehicle front-rear direction, and the upper flange 208 projecting upward from the ridge line 204 has a length in the vehicle vertical direction that extends toward the rear of the vehicle. For this reason, in the vehicle side part structure 200, the cross-sectional area of the closed cross-section of the side sill 210 does not increase toward the rear end 212, and the rigidity of the corner 216 on the lower rear side of the door opening 214 cannot be increased.

  As shown in FIG. 8, in the vehicle side part structure 200, the reinforcement 218 connects the rear end 222 of the side sill inner panel 220 and the end 226 on the vehicle inner side of the rear wheel house outer panel 224. However, the reinforcement 218 does not connect the rear end 222 of the side sill inner panel 220 and the rear end 228 of the side sill outer panel 202.

  Therefore, in the vehicle side part structure 200, the load input to the suspension mounting portion 230 is transmitted to the rear wheel house outer panel 224 via the reinforcement 218, and is not easily transmitted directly to the side sill outer panel 202. Therefore, according to the vehicle side part structure 200 of the comparative example, the input load is difficult to be dispersed by the side sill outer panel 202, and it is difficult to increase the rigidity of the suspension attachment part 230.

  On the other hand, according to the present embodiment, the cross-sectional area of the side sill 112 increases as it approaches the rear end 120 of the side sill 112, that is, the corner 108 of the door opening 106, so that the rigidity of the corner 108 can be increased. Furthermore, since the first ridgeline 128 and the second ridgeline 134 are continuous, the shapes of the side sill 112 and the rear wheel house 114 are continuous at the corner 108 of the door opening 106 having increased rigidity. Therefore, in the vehicle side part structure 100, not only the rigidity of the corner 108 of the door opening 106 is increased, but also the rigidity around the axis extending through the corner 108 in the vehicle width direction (body torsional rigidity) can be increased.

  Further, the reinforcement 140 linearly connects the rear end 144 of the side sill inner panel 118 and the rear end 146 of the side sill outer panel 116. Therefore, the load input to the suspension mounting portion 136 is applied not only to the side sill inner panel 118 to which the outer bracket 138 is directly coupled, but also to the side sill outer panel 116 in which the first ridgeline 128 is formed via the reinforcement 140. Is surely transmitted and distributed. Therefore, the rigidity of the suspension attachment portion 136 can be increased.

  Further, the reinforcement 140 closes the opening 148 of the rear end 120 of the side sill 112. Therefore, the reinforcement 140 also functions as a bulkhead with respect to the cross section of the side sill 112 and can suppress deformation of the cross section of the side sill 112.

  In addition, the first bulkhead 156 and the second bulkhead 158 are located at the first change point F of the inner ridge line 124 and the second change point G of the outer ridge line 126, respectively, of the inside of the side sill 112 where the cross-sectional size of the side sill 112 changes. Is arranged. For this reason, the inside of the side sill 112 is reinforced so that the side sill 112 is hardly deformed, and the rigidity is increased.

  Furthermore, the first bulk head 156, the second bulk head 158, and the reinforcement 140 are arranged at substantially equal intervals. That is, because the side sill 112 is provided with reinforcing members at substantially equal intervals at the first change point F of the inner ridge line 124, the second change point G of the outer ridge line 126, and the rear end 120 of the side sill 112, respectively. The rigidity can be further increased.

  In the present embodiment, the first ridgeline 128 formed on the side sill 112 curves upward as it goes rearward. As a result, the cross-sectional area of the side sill 112 also increases. However, the present invention is not limited to this. As long as the cross-sectional area of 112 increases, it may have any shape.

  FIG. 9 is a diagram showing each rigidity of the present embodiment and the comparative example. FIGS. 9A and 9B show the torsional rigidity of the vehicle body and the rigidity of the suspension mounting portion of the present embodiment and the comparative example, respectively. FIG. 10 is a diagram schematically showing a method for measuring each stiffness of the present embodiment and the comparative example. FIG. 10 shows the vehicle 102 to which the vehicle side part structure 100 of FIG. 1 is applied again, and each load input at the time of measurement is indicated by an arrow.

  As shown in FIG. 10, the torsional rigidity of the vehicle body is obtained by inputting the load Nab clockwise and the load Nb counterclockwise around the axis M extending in the vehicle width direction through the lower rear corner 108 of the door opening 106. The calculation was made with reference to the deformation of the wheel house outer panel in the longitudinal direction of the vehicle. As a result, as shown in FIG. 9A, the value of the torsional rigidity of the vehicle body of this embodiment is “13.29”, the value of the comparative example is “12.53”, and the torsional rigidity of the vehicle body is improved by 6%. Was confirmed.

  As shown in FIG. 10, the rigidity of the suspension mounting portion is determined by inputting the load Q toward the vehicle interior with the left and right side sills restrained at points Pa and Pb, and the displacement of the load point when the load is input. Calculated based on As a result, as shown in FIG. 9B, the value of the rigidity of the suspension mounting part of this embodiment is “9.61”, the value of the comparative example is “8.82”, and the rigidity of the suspension mounting part is 9 % Improvement was confirmed.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  INDUSTRIAL APPLICABILITY The present invention can be used for a vehicle side part structure including a side sill and a rear wheel house that are coupled at a lower rear corner of a door opening provided on a side surface of a vehicle.

DESCRIPTION OF SYMBOLS 100 ... Vehicle side part structure, 102 ... Vehicle, 104 ... Vehicle side surface, 106 ... Door opening, 108 ... Corner, 110 ... Side body outer panel, 112 ... Side sill, 114 ... Rear wheel house, 116 ... Side sill outer panel, 118 ... Side sill inner Panels 120, 144, 146 ... rear end, 122 ... rear wheel house outer panel, 124 ... inner ridge line, 126 ... outer ridge line, 128 ... first ridge line, 130 ... upper ridge line, 132 ... lower ridge line, 134 ... second ridge line DESCRIPTION OF SYMBOLS 136 ... Suspension attaching part, 138 ... Outer bracket, 140 ... Reinforce, 142 ... Trailing arm, 148 ... Opening, 150 ... Predetermined surface, 152, 154, 168, 174 ... Edge, 156 ... 1st bulkhead, 158 ... second bulkhead, 160 ... jack up point, 62 ... rear floor panel, 164 ... side members, 166 ... side, 170 ... bottom surface, 172, 178 ... upper flange, 176, 180 ... lower flange

Claims (6)

A side sill extending in the vehicle front-rear direction at the bottom of the door opening on the side of the vehicle;
In the vehicle side part structure comprising an arched rear wheel house coupled to the rear end of the side sill and accommodating a rear wheel of the vehicle,
The side sill is formed with one or more first ridgelines that are longitudinal in the vehicle longitudinal direction, and the cross-sectional area of the side sill increases as it approaches the rear end of the side sill,
The rear wheel house is formed with one or more arch-shaped second ridge lines,
Each first ridge line is continuous with each second ridge line having a mountain fold shape or a valley fold shape like each of the first ridge lines. The side sill has a side sill outer panel in which the one or more first ridge lines are formed, and a side sill inner panel coupled to the vehicle interior side of the side sill outer panel,
The vehicle side structure is
A mounting portion to which the suspension is mounted;
A bracket that covers the outside of the mounting portion and is coupled to a rear end of the side sill inner panel;
The vehicle side part structure according to claim 1, further comprising a reinforcement connecting the rear end of the side sill inner panel and the rear end of the side sill outer panel.   The vehicle side part structure according to claim 2, wherein the reinforcement has a flat plate shape at least between a rear end of the side sill inner panel and a rear end of the side sill outer panel.   The vehicle side part structure according to claim 2 or 3, wherein the reinforcement blocks an opening at a rear end of the side sill. The side sill outer panel has a trapezoidal cross section that protrudes to the outside of the vehicle,
The one or more first ridge lines are:
An inner ridge line of a valley fold shape passing through the vehicle inner end point of the upper side of the trapezoidal cross section;
Including a mountain-folded outer ridge line passing through the vehicle outer end point of the side,
The inner ridge line is a ridge line that begins to curve upward from a predetermined first change point,
The outer ridge line is a ridge line that begins to curve upward from a predetermined second change point that is closer to the rear end of the side sill than the first change point,
The vehicle side structure is
A first bulkhead passed in the vehicle up-down direction inside the side sill at a first change point;
The vehicle side part structure according to any one of claims 2 to 4, further comprising a second bulkhead that extends in the vehicle vertical direction inside the side sill at a second change point.   The vehicle side part structure according to claim 5, wherein the reinforcement, the first bulkhead, and the second bulkhead are arranged at substantially equal intervals.

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