Side door structure for vehicle

Abstract

The present invention provides a vehicle side door structure that can reduce the deformation stroke of the door towards the inner side of the vehicle cabin when a side collision occurs in the vehicle compared to the prior art. The present invention is a vehicle side door structure including a door cross member and a hinge reinforcement member. The door cross member has a hollow cross section that is open at both ends in the longitudinal direction. The hinge reinforcement member is formed by integrally forming an intermediate portion, an outer end portion, and an inner end portion to form the crank shape. The intermediate portion closes the opening at the front end of the door cross member and is joined to the longitudinal wall of the stepped portion of the inner panel of the side door. The outer end portion is joined to the outer transverse wall of the stepped portion of the inner panel and the extended portion of the outer wall of the door cross member. The inner end portion is joined to the inner wall of the door cross member.

Description

Technical Field

[0001] The present invention relates to a side door structure for a vehicle. Background Art

[0002] Conventionally, a side door structure for a vehicle is known in which a door cross member is arranged to extend along the inner side of a door skin (for example, refer to Patent Document 1). The door cross member is a tubular member obtained by roll-forming a steel plate and has a double closed cross-sectional shape in a cross-section perpendicular to the longitudinal direction. Specifically, regarding the cross-section of the door cross member, two right trapezoids that are symmetric about the vertical axis are arranged to form a substantially isosceles trapezoid as a whole. And the door cross member is arranged such that the upper base side (the short side) of the isosceles trapezoid faces the door skin. Thus, the two waists forming the isosceles trapezoid are inclined such that the distance between them gradually decreases toward the door skin side.

[0003] According to such a side door structure, when a collision load is input to the door from the outside of the vehicle, the deformation of the door cross member is suppressed by the portion corresponding to the inclined waist of the trapezoid, thereby improving the resistance to collision.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2010-149841 Summary of the Invention

[0007] However, regarding the conventional side door structure (for example, refer to Patent Document 1), since the end of the open door cross member and the bracket having an open surface for mounting the end to the door panel (inner panel), the mounting strength of the door cross member becomes insufficient. In addition, a gap is formed between the door and the vehicle body at a position corresponding to the end of the door cross member, and there is no firm structural member on the vehicle body side either.

[0008] Therefore, in the conventional side door structure, there is a problem that the deformation stroke of the door toward the inside of the vehicle compartment increases due to damage to the end of the door cross member or its peripheral components during a side collision of the vehicle.

[0009] Therefore, an object of the present invention is to provide a side door structure that can reduce the deformation stroke of the door toward the inside of the vehicle compartment during a side collision of the vehicle compared to the prior art.

[0010] The vehicle side door structure for solving the above problems is a vehicle side door structure including a door cross member and a hinge reinforcement member. The door cross member has a hollow cross section that is open at both ends in the longitudinal direction. The hinge reinforcement member is composed of a crank-shaped bent plate body joined to the front end of the door cross member. The vehicle side door structure is characterized in that the hinge reinforcement member is integrally formed by a middle portion, an outer end portion, and an inner end portion to form the crank shape. The middle portion closes the opening at the front end of the door cross member and is joined to the longitudinal wall of the stepped portion of the inner panel. The outer end portion is joined to the outer transverse wall of the stepped portion of the inner panel and the outer wall of the door cross member. The inner end portion is joined to the inner wall of the door cross member.

[0011] Advantages of the Invention

[0012] According to the side door structure of the present invention, compared with the prior art, the deformation stroke of the door toward the inner side of the vehicle compartment during a side collision of the vehicle can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 FIG. is a side view of a side door of a vehicle side door structure according to an embodiment to which the present invention is applied.

[0014] Figure 2 is Figure 1 a sectional view taken along line II-II of

[0015] Figure 3A is Figure 2 a sectional view taken along line IIIa-IIIa of

[0016] Figure 3B is Figure 2 a sectional view taken along line IIIb-IIIb of

[0017] Figure 4 FIG. is a partially enlarged perspective view of the end portion of the door cross member.

[0018] Figure 5 FIG. is an overall perspective view of the hinge reinforcement member.

[0019] Figure 6 is Figure 2 a partially enlarged view of the portion indicated by arrow VI of

[0020] Figure 7 is Figure 2 a partially enlarged view of the portion indicated by arrow VII of

[0021] Figure 8 FIG. is a partially enlarged view around the rear end portion of the door cross member in the vehicle side door structure of the first modification.

[0022] Figure 9 FIG. is a partially enlarged perspective view of the rear end portion of the door cross member in the vehicle side door structure of the second modification.

[0023] Figure 10 It is a partial enlarged view around the rear end portion of a door cross member in a side vehicle door structure of the second modification example.

[0024] Explanation of reference numerals

[0025] 1 Side vehicle door structure

[0026] 2 Side door

[0027] 3 Door skin

[0028] 4 Inner panel

[0029] 5 Door cross member

[0030] 9 Inner wall of the door cross member

[0031] 11 Hinge reinforcement member

[0032] 11a Outer end portion

[0033] 11b Middle portion

[0034] 11c Inner end portion

[0035] 15 Reinforcement member of the engaging member

[0036] 15a Outer end portion

[0037] 15b Middle portion

[0038] 15c Inner end portion

[0039] 26 Engaging hook (engaging member)

[0040] 27 Engaging pin (engaging member) Detailed implementation mode

[0041] Next, the side door structure of the mode (this embodiment mode) for implementing the present invention will be described in detail. The main feature of the side vehicle door structure (hereinafter simply referred to as the side door structure) of this embodiment mode is that the hinge reinforcement member is configured to block the opening of the front end portion of the door cross member having a hollow cross section (closed cross section), and is respectively joined to the front end portion of the door cross member and the inner panel.

[0042] Figure 1 It is a side view of the side door 2 on the left side of the vehicle to which the side door structure 1 of this embodiment mode is applied. Figure 2 It is Figure 1 the sectional view taken along line II-II. In addition, the front-rear, up-down, left-right directions in this embodiment mode are the same as the front-rear, up-down, left-right directions of the vehicle. In Figure 1 it, the door skin 3 (refer to Figure 2)Omitted for drawing convenience.

[0043] The following only describes the side door structure 1 of the side door 2 applicable to the left side of the vehicle, and the description of the side door structure 1 of the right side door 2, which is symmetric to the side door 2 on the left side of the vehicle across the vehicle body central axis, is omitted.

[0044] <Side door>

[0045] The Figure 1 The side door 2 shown is omitted in the drawing, but is hinge-mounted to the vehicle body side so as to open and close the opening on the side of the vehicle.

[0046] As Figure 2 shown, the side door 2 includes an inner panel 4 and a door skin 3 disposed on the outer side in the vehicle width direction ( Figure 2 the left side) of the inner panel 4.

[0047] In the present embodiment, the door skin 3 is disposed at a predetermined interval from the inner panel 4. Thus, a hollow portion is formed between the door skin 3 and the inner panel 4. In addition, the door skin 3 in the present embodiment is envisioned to be bent and joined (hemmed) to the periphery of the inner panel 4 by hemming.

[0048] A door cross member 5 is disposed on the inner panel 4 so as to extend along the inner surface of the inner panel 4.

[0049] The door cross member 5 is Figure 1 tilted in a side view of the side door 2 shown such that it gradually displaces downward as it extends rearward.

[0050] In addition, the door cross member 5 in the present embodiment extends across the upper hinge 25 of the pair of upper and lower hinges 25, 25 of the side door 2 and the engagement hook 26 that engages with the vehicle body when the side door 2 is closed, as will be described in detail later.

[0051] <Side door structure>

[0052] Next, the side door structure 1 of the present embodiment will be described (refer to Figure 1 ).

[0053] As Figure 1 the II-II cross-sectional view of Figure 2 shown, the side door structure 1 of the present embodiment is configured to include a door cross member 5 disposed between the door skin 3 and the inner panel 4 of the side door 2. In addition, in Figure 2 , the hinge 25 is represented by a phantom line (double-dot chain line) for drawing convenience.

[0054] In the side door 2 when it is closed, the door cross member 5 extends along the inner wall surface of the door skin 3 disposed on the outer side in the vehicle width direction ( Figure 2 the left side). Specifically, regarding the door cross member 5, except for the front and rear end portions of the door cross member 5, the common portion 5a that occupies most of its length direction is bent in a manner that slightly protrudes outward in the vehicle width direction to match the curvature of the curved surface that protrudes outward of the door skin 3.

[0055] In addition, Figure 2 the interval between the door skin 3 shown and the common portion 5a of the door cross member 5 is exaggeratedly depicted, and in the present embodiment, the door skin 3 and the common portion 5a of the door cross member 5 are in close contact via a mastic sealer (not shown).

[0056] Moreover, as will be described in detail later, the front end of the door cross member 5 in the present embodiment is joined to the inner panel 4 via the hinge reinforcement member 11. In addition, the rear end of the door cross member 5 in the present embodiment is joined to the inner panel 4 via the reinforcement member 15 of the engagement hook 26 (engagement member).

[0057] Next, the door cross member 5 will be further specifically described (refer to Figure 2 ).

[0058] Figure 3A is Figure 2 a sectional view taken along line IIIa-IIIa of Figure 3B is Figure 2 a sectional view taken along line IIIb-IIIb of Figure 4 is a partial enlarged perspective view of the end portion of the door cross member 5.

[0059] As Figure 3A and Figure 3B shown, the door cross member 5 is formed of a tubular body having a hollow cross section (closed cross section). The door cross member 5 in the present embodiment is envisioned to be a cross member composed of a hydroformed body obtained by applying hydraulic pressure to the inside of a tube as a raw material disposed in a specified mold while stamping, a tubular cross member obtained by stamping, a stamped cross member, etc.

[0060] Next, the closed cross section gradual change structure in the door cross member 5 of the present embodiment will be described.

[0061] As Figure 3A shown, the cross-sectional shape at the central portion in the length direction (axial direction) of the door cross member 5 is in a substantially isosceles trapezoid shape. Specifically, it is a flat substantially isosceles trapezoid shape in which the upper and lower widths W1 are longer than the left and right heights H1. And the lower base side that is the longer side compared to the upper base faces the door skin 3.

[0062] In addition, the door cross member 5 in the present embodiment has a substantially constant circumference around the axis within the length direction (axial direction). Moreover, the cross-sectional shape of the door cross member 5 gradually decreases in its vertical width from the central portion toward the end portions. That is, with respect to the door cross member 5 having a constant circumference, the left and right heights (the depth in the thickness direction of the side door 2 (refer to Figure 1 ) are increased at the end portions compared to the central portion in the length direction of the door cross member 5.

[0063] As Figure 3B shown, the cross-sectional shape at the end portion of such a door cross member 5 becomes a substantially right trapezoid with a left and right height of H2 and a vertical width of W2. And, in relation to the cross-sectional shape at the central portion of the door cross member 5, the relational expression of left and right height H1 < H2 and vertical width W1 > W2 is satisfied.

[0064] Figure 4 is a partial enlarged perspective view of the front end portion of the door cross member 5.

[0065] As Figure 4 shown, the opening 5b at the front end portion of the door cross member 5 has a shape (substantially right trapezoid) substantially the same as the cross-sectional shape shown in Figure 3B .

[0066] The door cross member 5 includes an outer wall 6, an upper wall 7, a lower wall 8, and an inner wall 9.

[0067] In addition, the outer wall 6 has an extension portion 6a that extends forward compared to the other upper wall 7, lower wall 8, and inner wall 9.

[0068] Furthermore, in Figure 4 , the reference numerals 22, 22 are insertion holes for bolts that are fastened to the inner end portions 11c of the hinge reinforcement members 11 (refer to Figure 5 ) to be described next.

[0069] The shape of the front end portion of the door cross member 5 having such an extension portion 6a is formed by performing laser cutting on the end portion of the door cross member 5 taken out from the mold after forming.

[0070] Next, the hinge reinforcement member 11 (refer to Figure 2 ) will be described.

[0071] Figure 5 is an overall perspective view of the hinge reinforcement member 11.

[0072] As Figure 5 shown, the hinge reinforcement member 11 is a bent body processed in such a manner that a plate body has a crank shape.

[0073] The hinge reinforcement member 11 has an outer end portion 11a, an intermediate portion 11b, and an inner end portion 11c.

[0074] In Figure 5 , the insertion holes 23, 23 of the bolts are respectively provided in a manner corresponding to the insertion holes 22, 22 of the bolts (refer to Figure 4 ) of the door cross member 5.

[0075] Figure 6 is Figure 2 a partial enlarged view of the arrow VI part of

[0076] As Figure 6 shown, the hinge reinforcement member 11 is arranged so as to block the opening 5b at the end of the door cross member 5 and is respectively joined to the inner panel 4 and the door cross member 5.

[0077] Specifically, as Figure 6 shown, the inner panel 4 forms a stepped portion through the outer transverse wall 4a of the stepped portion that extends rearward in parallel with the door skin 3 from the front end that is hem-joined to the door skin 3, and the longitudinal wall 4b of the stepped portion that extends inward in the vehicle width direction ( Figure 6 right side of

[0078] The outer end portion 11a of the hinge reinforcement member 11 is sandwiched between the outer transverse wall 4a of the stepped portion of the inner panel 4 and the extension portion 6a of the door cross member 5 and is spot-welded in a three-layer overlapping manner.

[0079] The middle portion 11b of the hinge reinforcement member 11 that blocks the opening 5b of the door cross member 5 and the longitudinal wall 4b of the stepped portion of the inner panel 4 are spot-welded in a two-layer overlapping manner. In addition, on the two-layer overlapping portion of the middle portion 11b and the longitudinal wall 4b of the stepped portion, the rotating side of the hinge 25 is fastened by bolts.

[0080] The inner end portion 11c of the hinge reinforcement member 11 is inserted into the inside of the door cross member 5 from the opening 5b of the door cross member 5, and after coinciding with the inner wall 9 of the door cross member 5, it is fastened by a pair of bolts 21.

[0081] At this time, the bolts 21 are inserted through Figure 4 the insertion holes 22 of the door cross member 5 shown in Figure 5 and the insertion holes 23 of the hinge reinforcement member 11 shown in

[0082] Thus, as Figure 3B shown, a pair of bolts 21, 21 respectively join the inner wall 9 of the door cross member 5 and the inner end portion 11c of the hinge reinforcement member 11 at two positions. Specifically, the bolts 21, 21 respectively pass through the insertion holes 22 shown in Figure 4 and Figure 5The inner wall 9 and the inner end portion 11c are joined at two portions offset in the front-rear direction and the up-down direction by the insertion holes 23 shown. In addition, regarding the joining of the inner wall 9 and the inner end portion 11c, it can be set to be joined at three or more portions, or it can be set to other mechanical joining such as rivet joining without being limited to bolt fastening.

[0083] Next, the joining of the rear end portion of the door cross member 5 and the inner panel 4 will be described.

[0084] Figure 7 is Figure 2 a partial enlarged view of the arrow VII portion.

[0085] As Figure 7 shown, the rear end portion of the door cross member 5, like the front end portion of the door cross member 5, has an extension portion 6a formed on the outer wall 6 by being subjected to laser cutting. In addition, the rear end portion of the door cross member 5 is joined to the inner panel 4 via a reinforcing member 15 of a latching hook 26 (latching member) for the side door 2 (refer to Figure 1 ).

[0086] In addition, the latching hook 26 in the present embodiment is formed of a thick steel plate bent in an L shape. Regarding this latching hook 26, although not shown in the drawing, a portion protruding from the rear portion of the side door 2 in the closed state (refer to Figure 1 ) toward the vehicle width direction inside ( Figure 7 the right side) is inserted into, for example, a catcher formed by a latching hole formed on the vehicle body side such as a B pillar.

[0087] According to such a latching hook 26 (latching member), when a side collision against the vehicle occurs, the side door 2 is prevented from being bent in the middle and invading into the passenger compartment side.

[0088] Next, the joining of the door cross member 5 to the inner panel 4 via the reinforcing member 15 of the latching hook 26 will be described.

[0089] As Figure 7 shown, the reinforcing member 15 is a bent body obtained by processing a plate body in a crank shape.

[0090] This reinforcing member 15, like the hinge reinforcing member 11 (refer to Figure 5 ), has an outer end portion 15a, a middle portion 15b, and an inner end portion 15c.

[0091] On the other hand, as Figure 7 shown, the inner panel 4 at the rear portion of the side door 2 forms a stepped outer cross wall 4c and a stepped inner cross wall 4d. The stepped outer cross wall 4c extends forward in parallel with the door skin 3 from the rear end joined to the hem of the door skin 3, and the stepped inner cross wall 4d extends from the front edge of the stepped outer cross wall 4c toward the vehicle width direction inside ( Figure 7bends forward and extends midway along the extension on the right side).

[0092] As Figure 7 shown, the outer end portion 15a of the reinforcing member 15 is sandwiched between the outer transverse wall 4c of the stepped portion of the inner panel 4 and the extending portion 6a of the door cross member 5 and is spot-welded in a three-layer overlapping manner.

[0093] The middle portion 15b of the reinforcing member 15 is arranged so as to block the opening 5b of the door cross member 5.

[0094] The inner end portion 15c of the reinforcing member 15 is inserted into the inside of the door cross member 5 from the opening 5b of the door cross member 5, and these four members, i.e., the inner end portion 15c, the inner wall 9 of the door cross member 5, the inner transverse wall 4d of the stepped portion of the inner panel 4, and the engaging hook 26, are overlapped in this order. And these members are fastened by a pair of bolts 21 in a four-layer overlapping manner. The pair of bolts 21 join these four members at two portions offset in the front-rear direction and the up-down direction. In addition, the joining of the inner wall 9 and the inner end portion 11c can be performed at three or more portions, or can be set to other mechanical joining such as rivet joining instead of being limited to bolt fastening.

[0095] <Effect>

[0096] Next, the effects of the side door structure 1 of the present embodiment will be described.

[0097] Regarding the side door structure 1 of the present embodiment, the hinge reinforcing member 11 is arranged so as to block the opening 5b of the front end portion of the door cross member 5 having a hollow cross section (closed cross section) and is joined to the door cross member 5 and the inner panel 4, respectively.

[0098] According to such a side door structure 1, since the door cross member 5 is firmly joined to the vehicle body side by the hinge 25, when a side collision against the vehicle occurs, the end portion of the door cross member 5 will not collapse or break. Thus, the side door structure 1 can reduce the deformation stroke of the side door 2 toward the inside of the vehicle compartment.

[0099] In addition, in the side door structure 1, the cross-sectional perimeter of the door cross member 5 intersecting the longitudinal direction is set to be the same within the longitudinal direction range. In addition, the door cross member 5 is formed in such a manner that the depth in the thickness direction of the side door 2 is different at the central portion and the end portion in the longitudinal direction.

[0100] According to such a side door structure, it is possible to design in such a way that the strength of the door cross member 5 with respect to the bending moment during a side collision is further improved. In addition, according to such a side door structure 1, since the perimeter of the door cross member 5 does not increase, it is possible to suppress an increase in the weight of the door cross member 5 while achieving an increase in strength.

[0101] For example, in the door cross member 5 as in the embodiment, if the depth of the end portion in the thickness direction of the side door 2 is set deeper than the central portion in the longitudinal direction, since the depth of the end portion of the door cross member 5 is deeper than the central portion, the strength of the door cross member 5 against the bending moment during a side collision can be further improved.

[0102] In addition, in the side door structure 1, the inner end portion 11c of the hinge reinforcement member 11 and the inner wall 9 of the door cross member 5 are mechanically joined at at least two or more portions offset in the front-rear direction and the up-down direction.

[0103] In this side door structure 1, the door cross member 5 during a side collision bears a load in the tensile direction. On the other hand, the inner wall 9 of the rear end portion of the door cross member 5 connected to the vehicle body side via the hinge reinforcement member 11 is mechanically joined at two or more portions offset in the front-rear direction and the up-down direction. Thus, the side door structure 1 can disperse the load applied to the end portion of the door cross member 5 two-dimensionally. The side door structure 1 can suppress the occurrence of cracks and the like at the end portion of the door cross member 5.

[0104] In addition, in this side door structure 1, the reinforcement member 15 of the engagement hook 26 (engagement member) is arranged so as to block the opening 5b of the rear end portion of the door cross member 5 having a hollow cross section (closed cross section) and is joined to the rear end portion of the door cross member 5 and the inner panel 4 respectively.

[0105] According to such a side door structure 1, since the rear end portion of the door cross member 5 is firmly joined to the vehicle body side by the engagement hook 26 (engagement member), when a side collision against the vehicle occurs, the rear end portion of the door cross member 5 will not break or fracture. Thus, the side door structure 1 can reduce the deformation stroke of the side door 2 toward the vehicle interior side.

[0106] In addition, regarding this side door structure 1, the inner end portion 15c of the reinforcement member 15 of the engagement hook 26 (engagement member) and the inner wall 9 of the door cross member 5 are mechanically joined at at least two or more portions offset in the front-rear direction and the up-down direction.

[0107] In this side door structure 1, the door cross member 5 during a side collision bears a load in the tensile direction. On the other hand, the inner wall 9 of the rear end portion of the door cross member 5 connected to the vehicle body side via the reinforcement member 15 is mechanically joined at two or more portions offset in the front-rear direction and the up-down direction. Thus, the side door structure 1 can disperse the load applied to the rear end portion of the door cross member 5 two-dimensionally. The side door structure 1 can suppress the occurrence of cracks and the like at the rear end portion of the door cross member 5.

[0108] In addition, in this side door structure 1, the door cross member 5 is bent along the door skin 3, and an adhesive sealant (viscoelastic member) is interposed between the door cross member 5 and the door skin 3.

[0109] According to such a side door structure 1, by forming a door cross member 5 along the door skin 3, the growth of the reaction force against the input load from the initial stage of a side collision becomes good. In addition, according to this side door structure 1, an adhesive sealant can be interposed over the entire outer side surface of the door cross member 5 facing the door skin 3, so that the surface rigidity of the door skin 3 can be improved and the vibration damping effect in the side door 2 can be enhanced. In addition, there is no need for a bracket when the adhesive sealant is interposed between the door cross member 5 and the door skin 3.

[0110] In addition, in this side door structure 1, regarding the front end portion of the door cross member 5, only the outer wall 6 extends in the length direction, and the outer end portion 11a of the hinge reinforcement member 11 is sandwiched and joined between the stepped outer cross wall 4a of the inner panel 4.

[0111] According to such a side door structure 1, since only the outer wall 6 of the front end portion of the door cross member 5 extends, the joining of the door cross member 5, the inner panel 4, and the hinge reinforcement member 11 by overlapping can be easily performed. In addition, a shape in which only the outer wall 6 of the door cross member 5 is extended can be easily formed by laser cutting.

[0112] In addition, the door cross member 5 of this side door structure 1 is a hydroformed body.

[0113] According to such a side door structure 1, a structure can be easily formed in which the door cross member 5 has a closed cross-section variable structure, is flattened at the central portion in the length direction, and has a thickness that becomes larger in the vehicle width direction toward both end portions.

[0114] In addition, the door cross member 5 of this side door structure 1 is a stamping formed body.

[0115] According to such a side door structure 1, the productivity of the door cross member 5 is improved.

[0116] The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments and can be implemented in various ways.

[0117] In the side door structure 1 of the above embodiment, an example in which a latching hook 26 is used as the latching member has been described, but the latching member can also be configured to use a latching pin (First Modification).

[0118] Figure 8 It is a partial enlarged view around the rear end portion of the door cross member 5 in the side door structure 1 of the First Modification.

[0119] As Figure 8 shown, the side door structure 1 of the First Modification includes a latching pin 27 as the latching member instead of the latching hook 26 in the above embodiment (see Figure 7 ).

[0120] In the first modified example, the engaging hook 26 in the above-described embodiment is omitted, whereby the inner end portion 15c of the reinforcing member 15, the inner wall 9 of the door cross member 5, and the inner transverse wall 4d of the stepped portion of the inner panel 4 are overlapped in three layers. And, instead of the bolt fastening in the above-described embodiment, spot welding in three layers is performed on the portion overlapped in three layers. Figure 7 Also, the outer end portion 15a of the reinforcing member 15 is sandwiched between the outer transverse wall 4c of the stepped portion of the inner panel 4 and the extending portion 6a of the door cross member 5 and is spot welded in a three-layer overlapping manner, similarly to the above-described embodiment.

[0121] The middle portion 15b of the reinforcing member 15 is disposed so as to block the opening 5b of the door cross member 5.

[0122] The engaging pin 27 extends so as to penetrate the stepped longitudinal wall 4e extending in the vehicle width direction (the left-right direction in the drawing) between the outer transverse wall 4c and the inner transverse wall 4d of the stepped portion of the inner panel 4 and also penetrate the middle portion 15b of the reinforcing member 15.

[0123] Although not shown in the drawing, the head portion 27a at the front end of the engaging pin 27 protruding rearward from the rear portion of the side door 2 in the closed state is engaged with a door catch bracket provided on the vehicle body side such as a B-pillar, thereby prohibiting the forward displacement of the head portion 27a. Figure 8 According to the side door structure 1 having such an engaging pin 27 (engaging member), when a side collision occurs to the vehicle, it is possible to more reliably prevent the side door 2 from being bent in the middle and invading the passenger compartment side.

[0124] Next, the door cross member 5 of the side door structure 1 of the second modified example will be described.

[0125]

[0126]

[0127] Figure 9 Figure 10 FIG. is a partially enlarged perspective view of the rear end portion of the door cross member 5 of the second modified example. Figure 10 FIG. is a partially enlarged view around the rear end portion of the door cross member 5 of the second modified example.

[0128] As shown in FIG. Figure 9 Regarding the outer wall 6 of the door cross member 5 of the second modified example, unlike the door cross member 5 having the extending portion 6a (refer to Figure 7 ) in the above-described embodiment (refer to Figure 7 ), the outer wall 6 has a cutout portion 6b. The rear end portion of the door cross member 5 having such a cutout portion 6b is formed by performing laser cutting processing, similarly to the front end portion of the door cross member 5.

[0129] Regarding the rear end portion of the door cross member 5 in the second modification example, the trailing edge of the outer wall 6 is displaced forward compared to the trailing edges of the other upper wall 7, lower wall 8, and inner wall 9. As a result, the insertion holes 22, 22 for the bolts formed in the inner wall 9 can be visually recognized by the user via the cutout portion 6b.

[0130] And, as Figure 10 shown, the reinforcing member 15 is arranged in a direction opposite to the orientation of the Figure 7 shown reinforcing member 15 in the front-rear direction, and the intermediate portion 15b closes the opening 5b of the door cross member 5.

[0131] The outer end portion 15a of the reinforcing member 15 is inserted into the door cross member 5 from the opening 5b of the door cross member 5 and is spot-welded to the outer wall 6 of the door cross member 5 in a two-layer overlapping manner.

[0132] At the inner end portion 15c of the reinforcing member 15, the inner wall 9 of the door cross member 5, the inner horizontal wall 4d of the stepped portion of the inner panel 4, and the engaging hook 26 are overlapped in this order. And these members are fastened by a pair of bolts 21 in a four-layer overlapping manner. Although not shown, these four members can also be mechanically joined, such as by bolt fastening, at two or more locations offset in the front-rear direction and the up-down direction.

[0133] According to such a side door structure 1, since the outer wall 6 of the door cross member 5 has the cutout portion 6b, the engaging hook 26 (engaging member) can be easily mounted on the door cross member 5 with respect to the bolts 21. In addition, such a shape having the cutout portion 6b in the outer wall 6 of the door cross member 5 can be easily formed by laser cutting.

[0134] In addition, as Figure 1 shown, the side door structure 1 of the above-described embodiment and modification example is assumed to be a rotating door that opens at the rear end with the hinge 25 on the front side of the side door 2. However, although not shown, the side door structure 1 can also be applied to a structure having a pair of side doors 2 that open left and right. The rear side door 2 that opens at the front end and the front side door 2 that opens at the rear end in such a pair of side doors 2 that open left and right are symmetric structures in the front-rear direction.

[0135] Therefore, in the rear side door 2 that opens at the front end, the hinge reinforcing member 11 is joined to the rear end of the door cross member 5, and its intermediate portion 11b closes the opening on the rear side of the door cross member 5. And the reinforcing member 15 of the engaging member (engaging hook 26, engaging pin 27) is joined to the front end of the door cross member 5, and its intermediate portion 15b closes the opening on the front end of the door cross member 5.

Claims

1. A side door structure for a vehicle, comprising a door cross member and a hinge reinforcement member, The door cross member has a hollow cross section that is open at both ends in the longitudinal direction, The hinge reinforcement member is composed of a crank-shaped bent plate body that is joined to one of the front end and the rear end of the door cross member, The side door structure for a vehicle is characterized in that, The hinge reinforcement member is integrally formed by a middle portion, an outer end portion, and an inner end portion to form the crank shape, where This middle portion seals an opening of one of the front end and the rear end of the door cross member and is joined to the longitudinal wall of the stepped portion of the inner panel of the side door, This outer end portion is joined to the outer transverse wall of the stepped portion of the inner panel and the outer wall of the door cross member, This inner end portion is joined to the inner wall of the door cross member.

2. The side door structure for a vehicle according to claim 1, characterized in that, Regarding the door cross member, the central portion and the end portion in the longitudinal direction have different depths in the thickness direction of the side door, and the cross-sectional perimeter of the door cross member that intersects the longitudinal direction is set to be the same within the longitudinal direction range.

3. The side door structure for a vehicle according to claim 1, characterized in that, The inner end portion of the hinge reinforcement member and the inner wall of the door cross member are mechanically joined at at least two or more portions that are offset in the front-rear direction and the up-down direction.

4. The side door structure for a vehicle according to claim 1, characterized in that, It further comprises: A engaging member that engages the side door and the vehicle body side; and A reinforcement member of the engaging member, which is composed of a crank-shaped bent plate body that is joined to the other of the front end and the rear end of the door cross member, The reinforcement member of the engaging member is integrally formed by a middle portion, an outer end portion, and an inner end portion to form the crank shape, where This middle portion seals the opening of the other of the front end and the rear end of the door cross member, This outer end portion is joined to the outer transverse wall of the stepped portion of the inner panel and the outer wall of the door cross member, This inner end portion is joined to the inner wall of the door cross member and the inner transverse wall of the stepped portion of the inner panel, The engaging member is fixed to the inner end portion or the middle portion.

5. The side door structure for a vehicle according to claim 4, characterized in that, The inner end portion of the reinforcement member of the engaging member and the inner wall of the door cross member are mechanically joined at at least two or more portions that are offset in the front-rear direction and the up-down direction.

6. The side door structure for a vehicle according to claim 1, characterized in that, The door cross member is bent along the door skin, and a viscoelastic member is interposed between the door cross member and the door skin.

7. The side door structure for a vehicle according to claim 1, characterized in that, Regarding one of the front end and the rear end of the door cross member, only the outer wall extends in the longitudinal direction, and the outer end portion of the hinge reinforcement member is sandwiched and joined between the outer transverse wall of the stepped portion of the inner panel.

8. The side door structure for a vehicle according to claim 1, wherein It further comprises: A engaging member that engages the side door and the vehicle body side; and The reinforcement member of the engaging member, which is composed of a crank-shaped bent plate body that is joined to the other of the front end and the rear end of the door cross member, Only the outer wall of the door cross member, which forms the other of the front end and the rear end of the door cross member, is partially cut away, and a bolt fastening portion is formed on the inner wall of the other of the front end and the rear end of the door cross member. The reinforcing member of the engaging member is integrally formed by a middle portion, an outer end portion, and an inner end portion to form the crank shape, wherein the middle portion closes the opening of the other of the front end and the rear end of the door cross member. the outer end portion is joined to the outer wall of the door cross member. the inner end portion joins the inner wall of the door cross member and the engaging member by means of the bolt fastening portion.

9. The side door structure for a vehicle according to claim 1, wherein the door cross member is a hydroformed body.

10. The side door structure for a vehicle according to claim 1, wherein the door cross member is a tubular cross member or a stamping cross member obtained by stamping.

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