JP5223253B2 - Car body rear structure - Google Patents

Description

  The present invention relates to a vehicle rear part structure to which a tow hook is attached.

Conventionally, as this type of vehicle rear structure, for example, one described in Patent Document 1 below is known. This straddles both these members so as to cover the lower part of the fixed portion between the rear end of the rear side member disposed along the vehicle longitudinal direction and the side surface of the rear end cross disposed along the vehicle width direction. A U-shaped hook bracket is provided.
Japanese Patent Laid-Open No. 7-17430

  However, in the above-described conventional vehicle rear structure, the hook bracket is simply fixed across the rear side member and the lower part of the rear end cross, so that the mounting strength when the traction load is input to the traction hook is high. It is not enough and improvements are desired.

  Accordingly, an object of the present invention is to increase the attachment strength of the tow hook.

The present invention is such that the vehicle width direction inner surface side of the wheel house inner is joined and connected to the vehicle width direction outer surface side of the rear side member extending in the vehicle front-rear direction, and the vehicle width in the vicinity of the rear end portion of the rear side member is determined. A mounting member is fixed on the outer side in the direction so as to protrude downward along the outer surface side, and a tow hook is attached to a portion protruding downward of the mounting member, and directed downward of the mounting member. the protruding portion, wherein provided a bolt mounting portion for mounting the tow hook, the end edge portion of the attachment member of the bolt mounting portion near provided regulating portion for regulating the movement of the bolt head INSTALLATION, The restricting portion is formed by forming a recess in the attachment member formed in a plate shape, and is configured by a bead portion protruding so as to cover a lower portion of the head of the attachment bolt. The main feature.

According to the present invention, the traction load input to the traction hook is efficiently distributed and transmitted from the mounting member to the wheel house inner having high strength as the vehicle body structural member via the outer side surface of the rear side member in the vehicle width direction. The attachment strength of the attachment member to which the tow hook is attached can be improved, and the attachment strength of the tow hook is improved.
In addition, the mounting member is provided with a bead at the tip of the part that protrudes downward, so that the strength near the tip increases, and it is attached to the load input from the rear of the vehicle to the traction hook. The downward movement of the bolt is restricted by the head of the mounting bolt being caught by the bead portion, and breakage by the mounting bolt near the tip can be prevented. At this time, it is not necessary to increase the plate thickness of the attachment member, and only the bead portion is provided, which can contribute to weight reduction of the attachment member.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a vehicle rear structure according to an embodiment of the present invention viewed from the rear of the vehicle and from the outside in the vehicle width direction, and FIG. 2 is a rear view of the vehicle rear structure from the vehicle rear and from the inside in the vehicle width direction. A perspective view and FIG. 3 are side views from the outside in the vehicle width direction. This vehicle rear portion structure corresponds to the vicinity of the attachment portion of the rear hook 3 as a tow hook that protrudes downward on the right side in the vehicle width direction of the rear bumper 1 provided at the rear portion of the automobile shown in FIG.

  1 to 3, the rear hook 3 has a hook body 5 and a support plate 7 to which the hook body 5 is fixed by welding. The support plate 7 is used as a hook bracket 9 as an attachment member and a rear side. It is fixed to the member 11.

  The rear side member 11 extends in the vehicle front-rear direction at both sides in the vehicle width direction, and is fixed to the lower surface of the floor panel 13 by welding. The rear side member 11 includes a bottom wall portion 11a and left and right side wall portions 11b and 11c, and has a substantially U-shaped cross section that opens on the upper floor panel 13 side. The rear side member 11 extends outward from the upper ends of the side wall portions 11b and 11c. The joining flange portions 11d and 11e that are bent toward the bottom are welded and fixed to the lower surface of the floor panel 13 described above.

  The hook bracket 9 described above is formed in a substantially plate shape as a whole, and the fixing portion 9a in the upper half is spot-welded to the side wall portion 11c on the front side in FIG. 3 in the vicinity of the rear end portion of the rear side member 11 in FIG. The lower half portion below the fixing portion 9a is protruded downward along the side wall portion 11c to form a hook attachment portion 9b.

  That is, the hook bracket 9 as the attachment member is fixed to the rear side member 11 on the outer surface side (side wall portion 11c) in the vehicle width direction so as to protrude downward along the outer surface side.

  And the support plate 7 of the above-mentioned rear hook 3 is attached inside the above-mentioned hook attachment part 9b in the vehicle width direction. That is, the rear hook 3 is attached to the hook attaching portion 9b which is a portion protruding downward from the hook bracket 9.

  FIG. 5 is a cross-sectional view taken along the line AA of FIG. 3. The support plate 7 includes a top hook mounting bolt 19 inserted into the bottom wall portion 11a of the rear side member 11 from below and a nut fixed by welding on the bottom wall portion 11a. The upper surface portion 7a is fixed to the upper surface portion 7a, and is bent downward from the right end portion in FIG. 5 of the upper surface portion 7a to the hook mounting portion 9b of the hook bracket 9 by the lower hook mounting bolt 23 and the nut 25. It is comprised from the side part 7b fixed, and the cross section is substantially L-shaped as a whole.

  Here, the nut 25 is fixed to the inner surface of the support plate 7 opposite to the hook bracket 9 by welding, and the lower hook mounting bolt 23 is inserted from the hook bracket 9 side and fastened to the nut 25.

  Further, the above-described support plate 7 has the side surface portion 7b protruding below the hook bracket 9, and the front end side of the protruding portion is slightly bent outward in the vehicle width direction (right side in FIG. 5), Both ends of the vehicle in the front-rear direction including the protruded portion are provided with flanges 7c and 7d that bend toward the vehicle inner side (left side in FIG. 5) from the side surface portion 7b to the upper surface portion 7a to increase the strength.

  Further, as shown in FIG. 3, the support plate 7 is formed by bending a portion protruding downward from the hook bracket 9 toward the rear of the vehicle (leftward in FIG. 3).

  The hook body 5 is joined and fixed to the surface of the support plate 7 on the vehicle inner side while being arranged in accordance with the shape of the support plate 7, and the hook portion 5 a formed at the tip portion is attached to the support plate 7. It protrudes from the tip.

  That is, the tow hook composed of the support plate 7 and the hook body 5 having the shape matched to the support plate 7 has a reverse L-shaped rear view (the L shape is reversed upside down and the left and right are reversed as shown in FIG. The side surface portion is fixed to the hook bracket 9 as an attachment member, and the upper surface portion is fixed to the lower surface of the rear side member 11.

  As shown in FIG. 2, the hook bracket 9 has a flange portion 9 c that is a reinforcing portion that is bent from an edge portion on the rear side of the vehicle body toward the side opposite to the rear hook 3 (outside in the vehicle width direction) and extends in the vehicle width direction. Provided.

  Further, as shown in FIG. 5, the hook bracket 9 is bent at the front end (lower end) of the lower hook mounting portion 9b so as to bend obliquely downward on the side opposite to the rear hook 3 (right side in FIG. 5). A bolt drop prevention bead portion 9e as a portion is provided.

  As shown in FIG. 1, the bolt dropout prevention bead portion 9 e has two regions in the vehicle front-rear direction including the portion to which the lower hook mounting bolt 23 of the fixing portion 9 a and the lower hook mounting portion 9 b is attached on the rear side member 11 side. It is formed by bulging out and forming a recess. Such a bolt-removal prevention bead portion 9e is located in the vicinity of the bolt mounting portion of the traction hook provided with the lower hook mounting bolt 23, and protrudes so as to cover the lower part of the head portion of the lower hook mounting bolt 23.

  A reinforcing bracket 27 serving as a reinforcing portion is provided between the hook bracket 9 and the support plate 7. The reinforcing bracket 27 includes a rear surface portion 27a that faces the vehicle longitudinal direction and forms substantially the same surface as the flange portion 9c. Further, the reinforcing bracket 27 includes an upper surface portion 27b extending from the upper edge of the rear surface portion 27a toward the front of the vehicle and interposed between the bottom wall portion 11a of the rear side member 11 and the upper surface portion 7a of the support plate 7. The part 27b is fastened together with the rear side member 11 together with the support plate 7 by an upper hook mounting bolt 19 on the rear side of the vehicle.

  The reinforcing bracket 27 includes a side surface portion 27c that extends forward from the side edge of the rear surface portion 27a on the hook bracket 9 side and is interposed between the hook bracket 9 and the side surface portion 7b of the support plate 7. 27c is fastened to the hook bracket 9 together with the support plate 7 by a lower hook mounting bolt 23 on the rear side of the vehicle.

  That is, the reinforcing bracket 27 that is the reinforcing portion is formed of a member separate from the hook bracket 9 that is the mounting member, and is fixed to the hook bracket 9 together by the lower hook mounting bolt 23 that is shared with the rear hook 3.

  FIG. 6 is a perspective view of the vehicle rear structure including the vehicle front side with respect to the portion where the hook bracket 9 is provided, as viewed from the vehicle front side and the vehicle width direction outside lower side. An inner side surface in the vehicle width direction of a wheel house inner 29 that serves as an inner member of a wheel house that is a tire storage portion is provided on the side wall portion 11c on the outer side in the vehicle width direction of the rear side member 11 on the front side of the vehicle with respect to the portion where the hook bracket 9 is provided. A vehicle inner portion 29a is fixed by welding.

  As shown in FIG. 2, the rear side member 11 has rear end joint surface portions 11f and 11g continuous to the left and right side wall portions 11b and 11c and the joint flange portions 11d and 11e as shown in FIG. Bolts 31 and 33 projecting from the vehicle front side toward the rear side are provided on the end joint surface portions 11f and 11g and the rear surface portion 27a of the reinforcing bracket 27, respectively.

  Here, the right rear end joint surface portion 11g in FIG. 2 is positioned on the vehicle rear side of the flange portion 9c of the hook bracket 9, so that the right bolt 31 in FIG. 2 is as shown in FIG. The flange portion 9c is inserted and fixed from the front side of the vehicle.

  Using these bolts 31 and 33, as shown in FIG. 3, a lower end portion 35 a of a vehicle body constituting member 35 such as a rear pillar at the rear of the vehicle is fixed by fastening nuts 37 and 39.

  In the vehicle rear structure as described above, when a traction load is input to the rear hook 3, the load input is transmitted from the hook bracket 9 to the rear side member 11, and the wheel house inner of the tire storage portion having high strength as a vehicle body structural member. 29, the load input to the attachment part to which the rear hook 3 of the hook bracket 9 is attached can be reduced, and deformation of the hook bracket 9 and the like around the attachment part can be suppressed.

  In addition, the hook bracket 9 of the present embodiment is substantially plate-shaped as a whole with a flange portion 9c compared to a conventional U-shaped cross-section, so that the weight can be reduced and the weight of the vehicle can be reduced. It can contribute to the conversion.

  Further, since the hook bracket 9 described above is provided with the bolt dropout prevention bead portion 9e at the tip portion (lower end portion) of the lower hook mounting portion 9b, the strength in the vicinity of the tip portion is increased, and the vehicle to the rear hook 3 is increased. The downward movement of the lower hook mounting bolt 23 with respect to the load input from the rear is restricted by the head of the mounting bolt 23 being caught by the bolt drop prevention bead portion 9e, and the lower hook mounting bolt in the vicinity of the tip portion. Breakage due to 23 can be prevented. At this time, it is not necessary to increase the plate thickness of the hook bracket 9 and only the bolt removal prevention bead portion 9e is provided, which can contribute to weight reduction of the hook bracket 9.

  In addition, since the flange portion 9c extending in the vehicle width direction is provided at the rear end portion of the hook bracket 9 and the reinforcing bracket 27 having the rear surface portion 27a is provided, the vehicle rear structure is also provided for load input from the vehicle width direction. As a result, the strength is increased, and deformation around the attachment portion to which the rear hook 3 of the hook bracket 9 is attached can be suppressed.

  Since the above-described flange portion 9c serving as the reinforcement portion is integrated with the hook bracket 9, an increase in the number of components due to the reinforcement portion being a separate component can be avoided.

  Further, the reinforcing bracket 27 serving as the reinforcing portion is formed of a member different from the hook bracket 9 and is fastened together with the support plate 7 by the upper and lower hook mounting bolts 19 and 23. Compared with this, the mounting workability including the rear hook 3 is improved.

  Further, in the present embodiment, when spot-welding the joint flange portion 11 e on the hook bracket 9 side of the rear side member 11 to the lower surface of the floor panel 13, the hook bracket 9 is attached to the rear side member 11. The nut 25 for attaching the rear hook 3 to the hook bracket 9 is fixed to the rear hook 3 (support plate 7) side, so that interference with the nut 25 of the spot welding gun 41 is avoided as shown in FIG. Can do.

  The lower hook mounting bolt 23 is not present at the time of spot welding because it is attached when the rear hook 3 is attached in the assembly process after the spot welding process.

  When the nut 25 is fixed to the hook bracket 9 side, the nut 25 becomes an obstacle, and the spot welding gun 41 is positioned farther from the rear side member 11 than the position shown in FIG. Will have to work as position).

  In such a case, the joining flange portion 11e of the rear side member 11 is further extended to the outside (right side in FIG. 7) and fixed to the extension portion by welding, so that the floor panel 13 of the joining flange portion 11e. As shown in FIG. 8, the spot welding point is located away from the side wall portion 11 c of the rear side member 11 and is easily deformed so that the rear side member 11 is separated from the floor panel 13 as indicated by a two-dot chain line when a load is input. Thus, the input load cannot be efficiently transmitted to the wheel house inner 29 in front of the vehicle.

  Furthermore, the hook bracket 9 can be grasped as a part of the vehicle body component together with the rear side member 11 by fixing the plate-like fixing portion 9a to the side wall portion 11c of the rear side member 11 in particular, and is fixed by bolts. The mounting strength is improved compared to the case.

  This is because when the hook bracket 9 is fixed with bolts, when the load is applied to the rear hook 3, the distance to the load point (side wall portion 11c of the rear side member 11) that is input to the vehicle body becomes long, so that the input load is increased. Although amplified and increased, the hook bracket 9 can be regarded as a part of the vehicle body by welding and fixing as in the present embodiment. For this reason, the load input to the vehicle body when the load is input to the rear hook 3. Since the point is a bolt fixing portion (lower hook mounting portion bolt 23) to the hook bracket 9 of the rear hook 3, the distance to the load point input to the vehicle body is shortened and mounting strength is improved.

  Further, by fixing the hook bracket 9 to the rear side member 11 by welding, painting can be performed together with vehicle body components such as the rear side member 11, and it is not necessary to paint as a separate part, so that the painting cost is reduced. Furthermore, since the mounting strength of the hook bracket 9 is increased by welding and fixing as described above, it is possible to achieve light weight and downsizing without increasing the thickness, and the workability is improved because the mounting work with bolts is unnecessary.

  Further, according to this embodiment, since the hook bracket 9 is welded and fixed to the rear side member 11 as described above, it can be regarded as a part of the vehicle body, so that the rotation of the tie-down load and the traction load input to the hooking portion 5a. The bolt fixing part (lower hook mounting part bolt 23) to the vehicle body of the rear hook 3 on which the moment acts is positioned further downward, and the rear hook 3 (hook part 5a) is extended further downward correspondingly. be able to. For this reason, the rear bumper 1 can expand a lower end part downward, and can raise the modeling freedom degree of a lower end part by this expansion.

It is the perspective view which looked at the vehicle rear part structure concerning one Embodiment of this invention from the vehicle back and vehicle width direction outer side downward. It is the perspective view which looked at the vehicle rear part structure of FIG. 1 from the vehicle rear and the vehicle width direction inner lower part. It is a side view from the vehicle width direction outer side of the vehicle rear part structure of FIG. It is a perspective view of the rear part of a motor vehicle provided with the vehicle rear part structure of FIG. It is AA sectional drawing of FIG. It is the perspective view which looked at the vehicle rear part structure of FIG. 1 from the vehicle front and the vehicle width direction outer side lower part. It is sectional drawing corresponding to FIG. 5 which shows the state which welds the rear side member to the lower surface of a floor panel with a spot welding gun. It is explanatory drawing which shows a deformation | transformation state when the welding point to the floor panel of a rear side member leaves | separates from the side wall part.

Explanation of symbols

3 Rear hook (tow hook)
9 Hook bracket (mounting member)
9c Hook bracket flange (reinforcement)
9e Bolt removal prevention bead part (regulation part)
11 Rear side member 11c Side wall of rear side member (vehicle width direction outer surface side)
11e Joint flange 13 Floor panel 23 Lower hook mounting bolt (Mounting bolt)
25 Nuts (nuts for attaching tow hooks)
27 Reinforcement bracket (reinforcement part)
29 Wheelhouse Inner 29a Wheelhouse Inner vehicle inner side (inner side in the vehicle width direction)

Claims (7)

The inner side in the vehicle width direction of the wheel house inner is joined to and connected to the outer side in the vehicle width direction of the rear side member extending in the longitudinal direction of the vehicle, and the outer side in the vehicle width direction in the vicinity of the rear end of the rear side member. The fixing member is fixed so as to protrude downward along the outer surface side, and a hook for traction is attached to a portion protruding downward of the mounting member.
A portion projecting downward of the mounting member, the provided bolt mounting portion for mounting the tow hook, the end edge portion of the attachment member of the bolt mounting portion near the movement of the bolt head INSTALLATION The regulation part which regulates
The restricting portion is formed by forming a recess in the mounting member formed in a plate shape, and is configured by a bead portion protruding so as to cover a lower portion of the head of the mounting bolt. Car body rear structure. The vehicle body rear portion structure according to claim 1, wherein a reinforcing portion extending in a vehicle width direction is provided on the attachment member. The vehicle body rear part structure according to claim 2 , wherein the reinforcing portion is configured by a flange portion integrated with the mounting member. The vehicle body rear part structure according to claim 2 , wherein the reinforcing portion is configured by a member separate from the mounting member, and is fastened and fixed to the mounting member by a mounting bolt common to the pulling hook. A joining flange portion protruding outward in the vehicle width direction on the rear side member upper part is fixed to a lower surface of a floor panel, and the traction hook is attached to the opposite side of the attachment flange portion of the attachment member, and the attachment of the traction hook is performed. The vehicle body rear part structure according to any one of claims 1 to 4 , wherein a nut for attaching a tow hook to the attachment member is fixed to a side opposite to the member. The vehicle body rear structure according to any one of claims 1 to 5 , wherein the mounting member is fixed to an outer side surface of the rear side member in the vehicle width direction by welding. Forming the tow hook to the rear view inverted L-shaped, is fixed to a side surface portion on the mounting member, either the upper surface portion of the claims 1, characterized in that fixed to the lower surface of the rear side member 6 The vehicle body rear structure according to claim 1.

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