JP5621587B2 - Quota structure - Google Patents

Description

  The present invention relates to a quarter structure provided between a rear door opening at the side of a vehicle body and a back door opening at the rear of the vehicle.

  In an automobile or the like, a quarter portion provided between a rear door opening at the side of the vehicle body and a back door opening at the rear of the vehicle body is greatly involved in safety performance. This is because there is a high possibility of receiving a load directly in the case of a side collision and a rear collision, and an anchor or retractor for a seat belt device for protecting a passenger is attached. An example of such a quota unit is described in Patent Document 1.

  In patent document 1, the outer panel which comprises the outer surface of a quarter part is provided, and the front reinforcement and the side edge of a back door opening part which are extended in the up-down direction along the rear edge of a rear door opening part are provided in the vehicle inner side of an outer panel. A rear reinforcement extending in the vertical direction is provided. An upper reinforcement is erected between the upper part of the front reinforcement and the upper part of the rear reinforcement, and a retractor reinforcement is erected between the front reinforcement and the rear reinforcement, spaced downward from the upper reinforcement. . Between the upper reinforcement and the retractor reinforcement, a connecting member is formed which is joined from the front end of the rear reinforcement to the back surface of the outer panel to form a closed cross section.

JP 2010-52627 A

  In automobiles and the like, in order to achieve high safety performance, a balance between rigidity and load absorption is extremely important. However, Patent Document 1 does not specifically mention the balance between rigidity and load absorbability, and there is no suggestion about such a structure.

  In Patent Document 1, a connecting material is added to ensure rigidity. However, the addition of connecting materials (part addition) increases costs, increases weight, and decreases productivity. Therefore, a configuration that satisfies the required performance without adding parts as much as possible is required. Furthermore, in Patent Document 1, the connecting material is welded to the back surface of the outer panel. However, since the spot spot of spot welding is visually recognized when the back door is opened, there is a problem in terms of appearance quality.

  The present invention has been made in view of the above problems, and by realizing an optimal balance between rigidity and load absorption, it is possible to improve safety performance and reduce costs, weight, spot welding, etc. An object of the present invention is to provide a quarter structure that can simplify the joining operation.

  In order to solve the above-described problems, a typical configuration of the present invention is a quarter structure that is provided between a rear door opening at the side of a vehicle body and a back door opening at the rear of the vehicle. A body outer, a front reinforcement installed on the inner side of the side body outer and extending vertically along the rear edge of the rear door opening, and a side edge of the back door opening installed on the inner side of the side body outer A rear reinforcement extending in the vertical direction and a quarter panel installed on the inner side of the side body outer, the quarter panel includes a first arm portion extending forward of the vehicle body and a rear end of the first arm portion. A second arm portion extending downward, and a front side end of the first arm portion is welded to a roof side panel extending in the vehicle longitudinal direction along the upper edge of the rear door opening. The front end of the second arm is welded to the upper rear end of the force, the rear end of the second arm is welded to the upper front end of the rear reinforcement, and the rigidity of the quarter panel is set higher than that of the front reinforcement. It is characterized by being.

  In such a configuration, the quarter panel has the front end of the first arm portion welded to the roof side panel and the rear end of the second arm portion welded to the rear reinforcement to transfer the load therebetween. If the quarter panel is destroyed, the load is not delivered smoothly, and there is a risk that the distribution of the load in the entire vehicle body may be hindered. Therefore, the quarter panel is set to have a high rigidity.

  On the other hand, a front reinforcement is welded to the front end of the second arm portion of the quarter panel as a portion that preferentially deforms the shape and absorbs the load. Thus, when a load is transmitted from the quarter panel having a high rigidity to the front reinforcement, the front reinforcement absorbs the load while preferentially deforming. By making the front reinforcement absorb the load preferentially, other loads can be reduced.

  If other loads are reduced, the required safety performance can be satisfied without positively reinforcing other parts. That is, since it is possible to reduce the number of parts, it is possible to achieve cost reduction, weight reduction, and simplification of joining work such as spot welding. In addition, since it is not necessary to add a connection material like patent document 1, the spot mark of the spot welding does not pose a problem, and it will be excellent also in terms of appearance quality.

  The side body outer and the front reinforcement are formed along the rear edge of the rear door opening, respectively, in front of the vehicle body rather than the welded portion between the front reinforcement and the front end of the second arm portion. They should be welded together with a flange.

  In such a configuration, the second arm portion of the quarter panel having high rigidity that transmits a load to the front reinforcement cannot be fitted into the flange of the front reinforcement (welded behind the flange). This prevents the load from being transmitted directly from the second arm portion of the quarter panel to the flange, so that the welding of the flange of the side body outer and the flange of the front reinforcement (such as spot missing in spot welding) is avoided. ) Can be prevented.

  The front reinforcement may include a bead extending in a vertical direction between a welded portion of the front end of the second arm portion and the flange.

  In such a configuration, the front reinforcement can have appropriate rigidity by including the beads extending in the vertical direction. The reason why the proper rigidity is given is that if the rigidity of the front reinforcement is too low, it will be deformed immediately after receiving the transmitted load (it will be bent completely) and the load cannot be absorbed sufficiently. Thus, load absorbability can be improved.

  Further, when the bead extending in the vertical direction is provided, stress concentration occurs at the base of the bead when the load is transmitted, and the base of the bead becomes a fold line of shape deformation. That is, a fold line of shape deformation is generated in the vertical direction. As a result, it is possible to suppress the generation of a fold line in the front-rear direction in the front-rear direction of the vehicle body, and it is possible to avoid the occurrence of peeling of welding with the side arm outer and the second arm portion of the quarter panel.

  An anchor through which the seat belt webbing is inserted may be attached below the first arm portion of the quarter panel.

  In such a configuration, when the occupant wearing the seat belt webbing is prevented from being thrown out, a large tensile force is applied from the anchor to the quarter panel. However, here, the quarter panel rigidity is set high as described above, and the load transmitted from the quarter panel is preferentially absorbed by the front reinforcement with shape deformation, and other loads are reduced. Therefore, it is possible to avoid occurrence of peeling of the weld due to a large tensile force from the anchor. Further, since the rigidity of the quarter panel is set high, and deformation of the mounting portion of the quarter panel anchor is suppressed, high safety performance can be ensured.

  The quarter panel may include a step formed in the vertical direction in front of the vehicle body relative to the anchor mounting location.

  In such a configuration, a large tensile force applied from the anchor to the quarter panel is distributed at the step formed in the vertical direction. By dispersing the tensile force in the vertical direction at this level difference, the front reinforcement located in front of the vehicle body can absorb the load on average (efficiently). Thereby, the load absorbability can be improved.

  The quarter panel is preferably made of high-tensile steel, the quarter panel has a thickness of 1.2 mm or more, and the front reinforcement has a thickness of 0.6 mm to 0.8 mm.

  In such a configuration, since the quarter panel is formed of high-tensile steel, its rigidity can be suitably secured. Moreover, it was confirmed that at least the rigidity and the load absorbability can be balanced by setting the thickness of the quarter panel to 1.2 mm or more and the thickness of the front reinforcement to 0.6 mm to 0.8 mm.

  Below the quarter panel, a front end is welded to the rear end of the front reinforcement, and further includes a retractor reinforcement that is welded to the front end of the rear reinforcement, and the rigidity of the retractor reinforcement is It should be set higher than the front reinforcement.

  In such a configuration, the rigidity of the retractor force is set high as in the quarter panel, and the load is received preferentially while the front reinforcement is deformed in shape by receiving a load transmitted from the retractor force. It is possible to secure safety performance suitably by securing rigidity in the part where rigidity such as retractor reinforcement is required, while firmly setting the part that preferentially absorbs load such as front reinforcement. .

  The rear reinforcement includes a rear reinforcement flange to which a rear end of the second arm portion and a rear end of the retractor reinforcement are welded to a front end thereof, and the rear reinforcement flange is provided at the rear end of the second arm portion. Between the end and the rear end of the retractor force, there is a raised portion formed by raising a part thereof toward the inside of the vehicle, and a vertical wall extending to the inside of the vehicle and continuing to the end of the raised portion Good.

  In such a configuration, the rear reinforcement flange has a relatively weak portion between the rear end of the second arm and the rear end of the retractor reinforcement, that is, a shape that is preferentially deformed. It becomes a part that absorbs the load. By providing the raised portion and the vertical wall in this portion, it is possible to ensure appropriate rigidity and improve load absorption. In addition, by ensuring appropriate rigidity, it is possible to avoid the occurrence of peeling of the weld from the rear end of the second arm part or the rear end of the retractor force due to excessive shape deformation.

  According to the present invention, by realizing an optimum balance between rigidity and load absorption, safety performance is improved, and cost reduction, weight reduction, and simplification of joining work such as spot welding are enabled. A quota structure can be provided.

It is a figure which shows the hatchback vehicle to which the quota part structure concerning this embodiment is applied. It is a figure which shows the quota part structure of FIG. FIG. 3 is an exploded perspective view of FIG. 2. It is the figure which removed the anchor, the retractor, and the side body outer from FIG. It is a figure explaining the press work of the quarter panel of FIG. It is AA sectional drawing and BB sectional drawing of FIG. It is CC sectional drawing of FIG. 2, DD sectional drawing, and EE sectional drawing. It is an enlarged view of the panel non-joining range of FIG.

  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 hatchback vehicle 100 to which a quarter part structure 110 according to the present embodiment is applied. The arrow FR in the figure indicates the front of the vehicle body, the arrow IN in the figure indicates the inside of the vehicle, and the arrow OUT in the figure indicates the outside of the vehicle.

  As shown in FIG. 1, a front door opening 102 is provided in front of the vehicle body and a rear door opening 104 is provided behind the front side of the vehicle body of the hatchback vehicle 100. A back door opening 106 is provided at the rear of the hatchback vehicle 100. The quarter part structure 110 according to the present embodiment is a structure applied to a quarter part provided between the rear door opening 104 and the back door opening 106.

  FIG. 2 is a diagram illustrating the quota unit structure 110 of FIG. FIG. 3 is an exploded perspective view of FIG. 4 is a view in which the anchor 146, the retractor 148, and the side body outer 112 are removed from FIG. In FIG. 4, the quarter panel 126 and the retractor force 132 are hatched for easy understanding.

  As shown in FIGS. 2, 3, and 4, in the quarter structure 110, the front reinforcement 114 and the rear reinforcement 116 are installed on the vehicle inner side of the side body outer 112 that forms the outer surface of the quarter section. The front reinforcement 114 is a member that extends in the vertical direction along the rear edge of the rear door opening 104. The rear reinforcement 116 is a member that extends in the vertical direction along the side edge of the back door opening 106, and here is constituted by a rear upper force 118 and a rear inner comp 120.

  The side body outer 112 and the front reinforcement 114 are respectively formed with flanges 112 a and 114 a along the rear edge of the rear door opening 104. As shown in FIG. 2, the flanges 112 a and 114 a are spot-welded to each other at a plurality of welding spot positions 200 (one of which is represented by a symbol in the drawing).

  A quarter panel 126 is installed between the front reinforcement 114 and the rear reinforcement 116. The quarter panel 126 includes a first arm portion 128 that extends forward of the vehicle body and a second arm portion 130 that extends downward from the rear end of the first arm portion 128, and is formed in a substantially L shape.

  The front end of the first arm portion 128 is welded to a roof side panel 134 that extends in the vehicle longitudinal direction along the upper edge of the rear door opening 104. The front end of the second arm 130 is welded to the upper rear end of the front reinforcement 114. Specifically, as shown in FIG. 4, at a plurality of welding spot positions 202 (represented by one representative in the figure) set behind the flange 114 a of the front reinforcement 114, the second The front end of the arm 130 is spot welded to the front reinforcement 114.

  The rear end of the second arm portion 130 is welded to the upper part of the rear reinforcement flange extending in the vertical direction at the front end of the rear reinforcement 116, that is, the upper part of the flange 118a at the front end of the rear upper force 118. Specifically, as shown in FIG. 4, the rear end of the second arm portion 130 has a plurality of welding spot positions 204 (represented as 1 representative in the figure) set on the flange 118 a at the front end of the rear upper force 118. Spot welding).

  A retractor force 132 is installed between the front reinforcement 114 and the rear reinforcement 116 below the quarter panel 126. The front end of the retractor force 132 is welded to the rear end of the front reinforcement 114.

  The rear end of the retractor force 132 is spot-welded at a plurality of welding spot positions 206 (represented by one representative in the figure) set below the flange 118a at the front end of the rear upper force 118. . Further, the rear end of the retractor force 132 is also welded to the upper portion of the flange 120a (rear reinforcement flange) at the front end of the rear inner compressor 120. The rear inner compressor 120 includes a rear inner panel 122 that extends in the vertical direction and a rear inner reinforcement 124 that reinforces the upper portion of the rear inner panel 122 (see FIG. 3).

  As shown in FIG. 2, an anchor 146 of the seat belt device is attached below the first arm portion 128 of the quarter panel 126, and a retractor 148 of the seat belt device is attached to the retractor reinforcement 132. More specifically, the anchor 146 is fastened with bolts and nuts to the mounting holes 126a of the second arm portion 130 of the quarter panel 126, and the retractor 148 is fastened with bolts and nuts to the mounting holes 132a of the retractor reinforcement 132. .

  A seat belt webbing 144 is inserted through the anchor 146. The seat belt webbing 144 is wound by the retractor 148. In order to prevent the occupant wearing the seat belt webbing 144 from being thrown out, a large tensile force is applied from the anchor 146 to the quarter panel 126, and the seat belt pretensioner (not shown) is operated to move the retractor 148 to the retractor reinforcement 132. Even a large tensile force is applied.

  Here, in the quarter panel 126, the front end of the first arm portion 128 is welded to the roof side panel 134, and the rear end of the second arm portion 130 is welded to the rear upper force 118, and the load between them is reduced. Deliver. If the quarter panel 126 is destroyed, the load cannot be transferred smoothly, and the distribution of the load in the entire vehicle body may be hindered.

  As described above, the anchor panel 146 is attached to the quarter panel 126. If the mounting hole 126a or the like, which is the mounting portion of the anchor 146 of the quarter panel 126, is deformed, the anchor 146 may be damaged or dropped, which may hinder safety performance.

  The same applies to the retractor force 132 to which the retractor 148 is attached. That is, if the mounting hole 132a or the like, which is the mounting portion of the retractor 148 of the retractor force 132, is deformed, the retractor 148 may be damaged or dropped, thereby impairing safety performance.

  Therefore, in the quarter part structure 110, the quarter panel 126 is formed thick with high-tensile steel (high-tensile material), and the rigidity of the quarter panel 126 is set high. Further, like the quarter panel 126, the retractor force 132 is also formed thick and its rigidity is set high. On the other hand, the thickness of the front reinforcement 114 is reduced to relatively reduce the rigidity, and the front reinforcement 114 is preferentially deformed to function as a portion that absorbs the load.

  Specifically, the plate thickness of the quarter panel 126 formed of high-strength steel is set to 1.2 mm or more, and the plate thickness of the front reinforcement 114 is set to 0.6 mm to 0.8 mm. It was confirmed that at least the rigidity and the load absorbability can be balanced by setting the plate thickness of the quarter panel 126 and the plate thickness of the front reinforcement 114 within this range. As a reference, Table 1 illustrates the plate thickness of each member.

  High-strength steel has the advantages that specific strength and specific rigidity are larger than general steel, can be reduced in weight, and is low in cost. FIG. 5 is a diagram for explaining press working of the quarter panel 126 of FIG. As described above, since the quarter panel 126 is substantially L-shaped, as shown in FIG. 5, two quarter panels can be arranged alternately to form a set. Therefore, high productivity can be ensured.

  6 is a cross-sectional view taken along line AA and BB in FIG. 2. 6A is a cross-sectional view taken along the line AA in FIG. 2, and FIG. 6B is a cross-sectional view taken along the line BB in FIG. 7 is a cross-sectional view taken along a line CC in FIG. 7A is a sectional view taken along the line CC in FIG. 2, FIG. 7B is a sectional view taken along the line DD in FIG. 2, and FIG. 7C is a sectional view taken along the line EE in FIG. .

  Reference is made to FIGS. When a large tensile force is applied from the anchor 146 to the quarter panel 126, the tensile force is transmitted to the front reinforcement 114. At this time, since the front reinforcement 114 preferentially deforms and absorbs the load (tensile force), the welding point position 202, which is a welding point between the front reinforcement 114 and the front end of the second arm portion 130, is used. The load applied to each hitting point can be reduced (the excessive load can be prevented). For this reason, it is possible to prevent the missing spots (peeling of the welds).

  Further, as described above, the flange 114a of the front reinforcement 114 is spot-welded to the flange 112a of the side body outer 112 at the welding spot position 200 in front of the welding portion at the front end of the second arm portion 130. Has been. Since the second arm portion 130 that transmits the load from the anchor 146 to the front reinforcement 114 is not fitted to the flange 114a of the front reinforcement 114, the load is not directly transmitted to the flanges 112a and 114a. Thus, it is possible to more reliably prevent each of the hit points at the welding hit point position 200 from being lost.

  The same applies to the retractor force 132, as shown in FIGS. When a large tensile force is applied from the retractor 148 to the retractor reinforcement 132, the tensile force is transmitted to the front reinforcement 114. At this time, since the front reinforcement 114 preferentially deforms and absorbs the load (tensile force), the load applied to the welded portion between the front reinforcement 114 and the front end of the retractor reinforcement 132 can be reduced. .

  Further, the flange 114 a of the front reinforcement 114 is spot-welded to the flange 112 a of the side body outer 112 at the welding point position 200 in front of the vehicle body with respect to the welding location at the front end of the retractor reinforcement 132. The retractor reinforcement 132 that transmits the load from the retractor 148 to the front reinforcement 114 is not fitted to the flange 114a of the front reinforcement 114, and the load is not directly transmitted to the flanges 112a and 114a. It is ensured that each spot at the welding spot position 200 is not missed.

  When a large tensile force is applied from the anchor 146 to the quarter panel 126, or when a large tensile force is applied from the retractor 148 to the retractor reinforcement 132, the tensile force is also transmitted to the rear reinforcement 116. The load transmitted to the rear reinforcement 116 is transmitted to the side body outer 112, and the load is distributed to various parts of the vehicle body. In this embodiment, the load applied to the rear door opening 104 and the back door opening 106 is bridged and distributed by the quarter panel 126, the retractor reinforcement 132, the front reinforcement 114, and the rear reinforcement 116, so that it is preferably safe. Performance can be increased.

  Further, as a feature of the present embodiment, the front reinforcement 114 includes a bead 114b extending in the vertical direction between the flange 114a and the welded portion at the front end of the second arm portion 130. By including the beads 114b extending in the vertical direction, the front reinforcement 114 can have appropriate rigidity.

  Appropriate rigidity is given because if the rigidity of the front reinforcement 114 is too low, it will be deformed immediately after receiving the transmitted load (become bent) and cannot absorb the load sufficiently. Because. That is, by providing this bead 114b, load absorbability can be improved.

  When the bead 114b extending in the vertical direction is provided, stress concentration occurs at the base 114c of the bead 114b when a load is transmitted, and the base 114c of the bead 114b becomes a fold line of shape deformation. That is, a fold line of shape deformation is generated in the vertical direction. Thereby, it is possible to suppress the generation of a fold line in the front-rear force 114 in the longitudinal direction of the vehicle body, and it is possible to avoid missing the hit points at the respective hit points at the welding hit point position 200 and the respective hit points at the weld hit point position 202.

  As a feature of the present embodiment, the quarter panel 126 includes a step 126b formed in the vertical direction in front of the vehicle body relative to the attachment location of the anchor 146. Thereby, a large tensile force applied from the anchor 146 to the quarter panel 126 is dispersed at the step 126b formed in the vertical direction. By dispersing the tensile force in the vertical direction at this step 126b, the load can be absorbed on the average (efficiently) by the front reinforcement 114 located in front of the vehicle body. Can be achieved.

  As shown in FIG. 4, between the rear end of the second arm 130 and the rear end of the retractor force 132 of the flange 118a (rear force flange) of the rear upper force 118 (rear force force 116). These are relatively weak parts to which other members are not joined (hereinafter, this part is referred to as “panel non-joined range E1”). Since the panel unbonded range E1 is a relatively weak portion, when a large tensile force is applied, the load is absorbed while preferentially deforming in the same manner as the front reinforcement 114.

  Therefore, a welding spot position 204 (particularly, the lowest welding spot position 204a) that is a welding spot with the rear end of the second arm portion 130 and a welding spot position that is a welding spot with the rear end of the retractor force 132. The load applied to 206 (particularly, the uppermost welding spot position 206a) can be reduced. Therefore, it is possible to prevent missing of each hit point.

  FIG. 8 is an enlarged view of the panel non-bonding range E1 of FIG. As shown in FIG. 8 and FIG. 7 (c), as a feature of the present embodiment, in the panel unjoined range E 1, a raised portion 140 formed by raising a part thereof toward the vehicle interior, and extending toward the vehicle interior. A vertical wall 142 is provided at the end of the raised portion 140.

  By providing the raised portion 140 and the vertical wall 142 in this portion, appropriate rigidity can be ensured. As a result, it is possible to prevent the shape from being deformed immediately, so that the load absorbability can be improved. In addition, by ensuring appropriate rigidity, it is possible to prevent the spot of the welding spot position 204a, the spot of the welding spot position 206a, and the like from being lost due to excessive shape deformation.

  As described above, in the above-described quarter structure 110, the rigidity of the quarter panel 126 and the retractor reinforcement 132 that require rigidity is increased, while the load such as the front reinforcement 114 and the panel non-bonding range E1 is preferentially absorbed. The part is set firmly. That is, a balance between rigidity and load absorption is achieved. Thus, even if a large tensile force is applied from the anchor 146 spear 148, the portion that preferentially absorbs the load sufficiently absorbs the load.

  Therefore, the load applied to others is reduced, and it can be avoided that an excessive load is applied to them. Therefore, it is possible to prevent the missing points of welding. Thus, safety performance can be improved without requiring aggressive reinforcement. Since aggressive reinforcement is not required, the number of parts can be reduced, so that cost reduction, weight reduction, and simplification of joint work such as spot welding can be achieved.

  Needless to say, the present invention is not limited to such examples. 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 quarter structure provided between a rear door opening at the vehicle body side and a back door opening at the rear of the vehicle.

E1 ... Panel unjoined range, 100 ... Hatchback car, 102 ... Front door opening, 104 ... Rear door opening, 106 ... Back door opening, 110 ... Quater structure, 112 ... Side body outer, 112a ... Flange, 114 ... Front reinforcement, 114a ... flange, 114b ... bead, 114c ... root, 116 ... rear reinforcement, 118 ... rear upper reinforcement, 118a ... flange (rear reinforcement flange), 120 ... rear inner comp, 120a ... flange (rear) (Reinforce flange), 122 ... rear inner panel, 124 ... rear inner reinforcement, 126 ... quarter panel, 126a ... mounting hole, 126b ... step, 128 ... first arm, 130 ... second arm, 132 ... Retractor force, 132a ... Mounting hole 134 ... roof side panel, 140 ... raised portion, 142 ... vertical wall, 144 ... seat belt webbing, 146 ... anchor, 148 ... retractor, 200, 202, 204, 206 ... welding point

Claims (8)

In the quarter structure provided between the rear door opening on the side of the vehicle body and the back door opening on the rear of the vehicle body,
A side body outer that forms the outer surface of the quarter part;
A front reinforcement installed on the vehicle inner side of the side body outer and extending in a vertical direction along a rear edge of the rear door opening;
A rear reinforcement which is installed on the vehicle inner side of the side body outer and extends in the vertical direction along a side edge of the back door opening;
A quarter panel installed on the inner side of the side body outer,
The quarter panel includes a first arm portion extending forward of the vehicle body and a second arm portion extending downward from the rear end of the first arm portion, and the vehicle body along the upper edge of the rear door opening. The front end of the first arm is welded to the roof side panel extending in the front-rear direction, the front end of the second arm is welded to the upper rear end of the front reinforcement, and the front end of the rear reinforcement is The rear ends of the two arms are welded,
A quarter part structure characterized in that the rigidity of the quarter panel is set higher than that of the front reinforcement.   The side body outer and the front reinforcement are respectively formed along the rear edge of the rear door opening in front of the vehicle body from the welded portion between the front reinforcement and the front end of the second arm portion. The quarter part structure according to claim 1, wherein the quarter part structure is welded to each other by a flange.   3. The quarter structure according to claim 2, wherein the front reinforcement includes a bead extending in a vertical direction between a welding portion at a front end of the second arm portion and the flange.   The quarter part structure according to any one of claims 1 to 3, wherein an anchor through which a seat belt webbing is inserted is attached below the first arm part of the quarter panel. .   The quarter part structure according to claim 4, wherein the quarter panel includes a step formed in a vertical direction in front of the vehicle body relative to a mounting position of the anchor.   6. The quarter panel is formed of high-tensile steel, the quarter panel has a thickness of 1.2 mm or more, and the front reinforcement has a thickness of 0.6 mm to 0.8 mm. The quota part structure according to any one of the above. Below the quarter panel, a front end is welded to the rear end of the front reinforcement, and further includes a retractor reinforcement that is welded to the front end of the rear reinforcement.
7. The quarter structure according to claim 1, wherein rigidity of the retractor force is set higher than that of the front force. The rear reinforcement includes a rear reinforcement flange to which a rear end of the second arm portion and a rear end of the retractor reinforcement are welded to a front end thereof,
The rear reinforcement flange is formed between a rear end of the second arm portion and a rear end of the retractor reinforcement, and a raised portion formed by raising a part of the rear reinforcement flange toward the inner side of the vehicle. The quarter part structure according to claim 7, further comprising a vertical wall that extends and continues to an end of the upper portion.

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