JP4708058B2 - Car body rear structure - Google Patents

Description

  The present invention relates to a vehicle body rear structure, and more particularly to a vehicle body rear structure in which reinforcement of a suspension mounting portion of a rear body is considered.

  Conventionally, as a vehicle body rear structure in which a reinforcing member is provided on a suspension mounting portion of a rear body, there is one disclosed in Patent Document 1.

The rear structure of the vehicle body is structured to increase the strength and rigidity of the strut tower during traveling by connecting a reinforcing member to the strut tower from the vehicle interior side.
Japanese Utility Model Publication No. 10-258772

  However, in the conventional vehicle body rear structure, since the reinforcing member is provided on the vehicle interior side, the vehicle interior space is narrowed.

  In view of the above fact, an object of the present invention is to provide a vehicle body rear structure that can reinforce a suspension mounting portion without reducing a vehicle interior space.

According to a first aspect of the present invention, a vehicle body rear structure includes a floor member of a vehicle body, a side member that is provided on the outer side in the vehicle width direction of the floor member, and that is disposed along the vehicle front-rear direction. It is, is connected the side member to the intermediate portion Rutotomoni, a suspension attachment member mounting surface that extends in the vehicle width direction is formed by bending the lower end portion of the extension portion extending in the vehicle below the side members, one end A reinforcing member connected to the mounting surface of the suspension mounting member and having the other end connected to the lower surface of the floor member and preventing the suspension mounting member from falling down, and the reinforcing member is connected. the floor member is a cross member extending in a vehicle width direction from said side members, the cross member and the side member are disposed at substantially the same height, before In the extending length portion wherein the reinforcing member and the cross member, and forming a substantially triangular space as seen from the vehicle longitudinal direction.

  According to the above configuration, the load from the road surface during traveling is transmitted to the suspension mounting member via the suspension. As a result, the suspension mounting member tends to be deformed so as to tilt left and right when viewed from the front of the vehicle with the mounting portion with the side member as a fulcrum.

However, one end of the reinforcing member is connected to a mounting surface formed so as to extend further in the vehicle width direction from the lower end portion of the extended portion of the suspension mounting member that extends below the side member than the side member , and the other end is the floor member The suspension mounting member is prevented from falling and being deformed. That is, when the suspension mounting member is about to fall down, the reinforcing member transmits the load received from the lower end portion of the suspension mounting member to the lower surface of the floor member, thereby suppressing the suspension mounting member from swinging.

The floor member to which the reinforcing member is connected is a cross member extending in the vehicle width direction from the side member, and transmits the load received by the reinforcing member from the extension portion of the suspension mounting member to the cross member that is the vehicle body skeleton member. This improves the support rigidity of the extension portion of the suspension mounting member. As a result, the suspension mounting member is prevented from falling and the torsional rigidity of the vehicle body is improved.

Further, the side member and the cross member are arranged at substantially the same height, and are a substantially triangular space when viewed from the front-rear direction of the vehicle, with the extension of the suspension mounting member, the reinforcing member, and the cross member extending downward from the side member. Form. As a result , the load received by the reinforcing member from the extension of the suspension mounting member acts as a load in the compression direction or the tensile direction on the reinforcing member. Therefore, the reinforcing member receives the load received from the extension of the suspension mounting member as a cross member. Can communicate efficiently. As a result, even if the strength of the reinforcing member is not increased more than necessary, the suspension mounting member is prevented from falling down and the torsional rigidity of the vehicle body is improved.

The vehicle body rear structure according to claim 2 of the present invention is the vehicle body rear structure according to claim 1 , wherein a bent portion bent inward in the vehicle width direction in a plan view is provided in the intermediate portion in the longitudinal direction of the side member. In addition, the cross member and the suspension attachment member are connected to the bent portion .

  According to the above configuration, the collision load received by the side member during a rear collision is concentrated on the bent portion, but the concentration on the bent portion is suppressed by the rigidity of the cross member, the suspension mounting member, and the reinforcing member.

  According to the vehicle body rear portion structure of the present invention, the suspension mounting portion can be reinforced without reducing the vehicle interior space.

  A first embodiment of a vehicle body rear structure according to the present invention will be described with reference to FIGS.

  In the figure, the arrow FR indicates the vehicle front direction, the arrow UP indicates the vehicle upward direction, and the arrow IN indicates the vehicle width inner side direction.

  FIG. 1 shows a wheel house portion 10 at the rear of a vehicle to which the first embodiment is applied. As shown in FIGS. 1 and 2, a side member 14 having a hat-shaped cross section whose longitudinal cross section is open to the outside of the vehicle is disposed along the vehicle front-rear direction at the side end of the rear floor panel 12 constituting the floor member. Has been. That is, the longitudinal cross section of the side member 14 is formed with an upper flange 14B and a lower flange 14C in the vertical direction from a U-shape with an opening toward the vehicle outer side constituted by the upper surface 14A, the upright surface 14F, and the lower surface 14D. It has a hat cross section. The rear floor panel 12 is placed on the upper surface 14A of the side member 14, and is connected to the side member 14 by welding.

  Further, the side member reinhose 22 is welded to the upper flange 14B and the lower flange 14C of the side member 14 on the vehicle outer side of the side member 14.

  Further, a wheel house panel 26 that covers a rear tire (not shown) and that serves as a suspension mounting member is connected to the vehicle outer side of the side member rein hose 22 by welding with the side member rein hose 22 sandwiched between the upper flange 14B of the side member 14. Has been. The wheel house panel 26 is provided with a recess 26A so as to keep a sufficient distance from a suspension (not shown). Further, as shown in FIGS. 1 and 6, a suspension tower rein hose 28 as a suspension mounting member is disposed on the vehicle outside of the recess 26A of the wheel house panel 26 so as to fit into the recess 26A, like the wheel house panel. Yes.

  The suspension tower rein hose 28 is formed by punching a thick steel plate (for example, 2 mm), and its upper end portion is bent together with the wheel house panel 26 to form a suspension mounting surface 28C (not shown). Furthermore, an attachment hole 28D into which a suspension (not shown) is inserted is formed in the attachment surface 28C. Further, the suspension tower rein hose 28 is connected to the wheel house panel 26 by welding at the welded portion A of the mounting surface 28C shown in FIG. Further, the suspension tower rein hose 28 is bent along the wheel house panel 26 from the mounting surface 28C, and the upper flange 14B of the side member 14, the wheel house panel 26 and the side member rein hose 22 are joined at the weld B shown in FIG. They are connected by welding. Further, the suspension tower rein hose 28 is connected to the lower flange 14C of the side member 14 and the side member rein hose 22 by welding at a welded portion C shown in FIG. Further, as shown in FIG. 2, the suspension tower rein hose 28 is provided extending downward from the welded portion C to form an extended portion 28E. Further, the lower end portion of the extension portion 28E is formed such that a mounting surface 28A to which a brace 34, which will be described later, is attached and which extends in the vehicle width direction is bent in the vehicle outer direction.

  With this configuration, a suspension (not shown) is attached to the attachment surface 28C, and the load from the road surface during traveling is transmitted to the suspension tower rein hose 28 and the wheel house panel 26 via the suspension. With this load, the suspension tower rein hose 28 and the wheel house panel 26 are viewed from the front of the vehicle as indicated by an imaginary line (two-dot chain line) in FIG. Try to deform so that it falls to the left and right.

  Therefore, the brace 34 shown in FIG. 3 prevents the suspension tower rein hose 28 from falling down. One end of the brace 34 is connected to the suspension tower rein hose 28, and the other end is connected to a cross member 40 that constitutes a floor member together with the rear floor panel 12.

  As shown in FIGS. 4 and 5, the brace 34 is formed by punching a thick steel plate and extends along one side extending in the vehicle width direction when viewed from below the vehicle and the lower flange 14 </ b> C of the side member 14. The other side and the remaining side spanned on both sides are substantially triangular, and a through hole 34E is provided in the center. Further, two attachment holes 34C shown in FIG. 3 are formed in triangular corners on the attachment surface 34A of the brace 34 connected to the attachment surface 28A at the lower end of the suspension tower rein hose 28. Further, as shown in FIG. 2, the attachment surface 34 </ b> A extends obliquely upward inward in the vehicle width direction, is bent at a position in contact with the cross member 40, and is an attachment surface 34 </ b> B that is flush with the cross member 40. Is provided. Further, two mounting holes 34D shown in FIG. 3 are formed side by side in the vehicle width direction on the mounting surface 34B with the cross member 40.

  As shown in FIGS. 3 and 4, the cross member 40 to which the brace 34 is attached is provided so as to extend from the side member 14 in the vehicle width direction, and is arranged as a hat cross section whose longitudinal cross section is open on the vehicle upper side. . That is, the cross section 40 has a longitudinally perpendicular cross section in which a front flange 40D and a rear flange 40E are formed in the front-rear direction from a U-shape with the opening on the upper side of the vehicle constituted by the bottom surface 40A, the front surface 40B and the rear surface 40C. It has a hat cross section. The surface to which the brace 34 is attached is a bottom surface 40A facing downward in the vehicle. Further, the bottom surface 40A is disposed at substantially the same height as the bottom surface 14D, and the side end thereof is the bottom surface 14D of the side member 14. And connected by welding. Furthermore, the front flange 40D and the rear flange 40E of the cross member 40 are connected to the rear floor panel 12 by welding.

  Here, as shown in FIG. 3, the bolt 32 is inserted into the mounting hole 34C from the lower side of the vehicle, and tightened to the nut 28B fixed to the back surface of the mounting surface 28A (the surface opposite to the side where the brace 34 is mounted). Furthermore, the brace 34 is inserted into the mounting hole 34D from below the vehicle and tightened to the nut 40F fixed to the back surface of the bottom surface 40A of the cross member 40 (the surface opposite to the side where the brace 34 is attached). Is connected to the suspension tower rein hose 28 and the cross member 40.

  With this configuration, the extension portion 28E of the suspension tower rein hose 28, the brace 34, and the bottom surface 40A of the cross member 40 have a substantially triangular shape when viewed from the vehicle front-rear direction, as shown in FIG. Further, the brace 34 is composed of only the mounting surface 34A from the mounting surface 28A of the suspension tower rein hose 28 to the cross member 40. Therefore, the load received by the brace 34 can be transmitted to the cross member 40 as a force (in-plane force) in a direction along the surface of the mounting surface 34A, and is received as a bending force in a direction intersecting the surface of the mounting surface 34A. High rigidity compared to

  Further, the attachment surface 28A of the suspension tower rein hose 28 to which the brace 34 is attached is provided at a position away from the fulcrum D in the vehicle downward direction. In this manner, the load received from the mounting surface 28C and the wheel house panel 26 and the suspension tower reinhose 28 are deformed so as to fall compared to supporting between the fulcrum D above the fulcrum D and the mounting surface 28C. By fixing below the fulcrum D, it is possible to fix the position where the length of the moment arm is sufficiently long, so that it is possible to efficiently fall down and prevent deformation.

  On the other hand, as shown in FIG. 1, an underfloor storage portion 44 that can store luggage in the lower part of the floor surface from the passenger compartment is formed in the rear part of the vehicle body so that the rear floor panel 12 has a convex shape below the vehicle. Is provided. Further, the convex shape is expanded outward in the vehicle width direction in order to secure a large storage amount of the underfloor storage portion 44. Accordingly, as shown in FIG. 7, the side member 14 has the bottom surface 40 </ b> A of the cross member 40 fixed by welding, and the vehicle is started from a portion where the suspension tower rein hose 28 is disposed outside the vehicle. A bent portion 14E is provided by being bent outward from the rear when viewed from below. Further, the side member 14 extends to the vehicle rear outside along the convex shape of the underfloor storage portion 44, and the direction of the side member 14 is changed to the vehicle rearward direction by a bent portion 14 </ b> G of the side end portion of the underfloor storage portion 44. Has reached the department.

  Thereby, the collision load received by the side member 14 at the time of the rear collision is concentrated on the bent portion 14E as a notch effect, but the notch effect is suppressed by the rigidity of the cross member 40, the brace 34, and the suspension tower rein hose 28, and the bending The portion 14E is prevented from being locally deformed. Note that the notch effect means that the load is concentrated on the bent portion.

  Next, the operation of the first embodiment will be described.

  In the vehicle body rear structure of the first embodiment, a load input from the road surface during traveling is transmitted to the suspension tower rein hose 28 and the wheel house panel 26 via a suspension (not shown). As shown in FIG. 2, the suspension tower rein hose 28 and the wheel house panel 26 try to be deformed so as to fall from side to side as indicated by an imaginary line (two-dot chain line) with the fulcrum D as a starting point. However, the load received by the suspension tower rein hose 28 by the brace 34 connected to the lower end of the suspension tower rein hose 28 is transmitted to the cross member 40 as an in-plane force of the brace 34. As a result, the suspension tower rein hose 28 is prevented from falling and deformed, the torsional rigidity of the vehicle body is increased, the steering stability is improved, and the deterioration of comfortability due to unpleasant vibrations is suppressed.

  Further, the collision load received by the side member 14 at the time of the rear collision is concentrated on the bent portion 14E as a notch effect, but the load concentration is suppressed by the rigidity of the cross member 40, the suspension tower rein hose 28 and the brace 34.

  Therefore, the suspension mounting portion can be reinforced without reducing the space in the vehicle interior. In particular, in the case of a 1 Box vehicle in which the vehicle interior side of the suspension mounting portion of the rear body is a living space, securing the vehicle interior space greatly affects the merchantability, so the suspension mounting portion can be reinforced without reducing the vehicle interior space. It is advantageous. Furthermore, the underfloor storage part 44 behind the vehicle body is secured widely.

  Next, a second embodiment of the vehicle body rear structure according to the present invention will be described with reference to FIGS.

  In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 9 and 10, the lower end portion of the extension portion 50 </ b> E is bent in the vehicle inner direction, and the attachment surface 50 </ b> A to which the brace 34 is attached extends in the substantially vehicle width direction.

  As shown in FIGS. 8 and 11, a nut 50 </ b> B is fixed to the back surface of the mounting surface 50 </ b> A (the surface opposite to the side where the brace 34 is mounted), and the bolt 32 is attached to the mounting hole of the brace 34 from below the vehicle. The brace 34 is connected to the suspension tower rein hose 50 by being fastened to a nut 50 </ b> B that is inserted through 34 </ b> C and fixed to the mounting surface 50 </ b> A.

  Next, the operation of the second embodiment will be described.

  The load received by the suspension tower rein hose 28 is transmitted to the cross member 40 as an in-plane force of the brace 34. This prevents the suspension tower rein hose 28 from being collapsed and deformed.

  In this embodiment, the length of the brace 34 in the vehicle width direction can be shortened as compared with the above embodiment. Thereby, the deformation of the brace 34 is reduced, and the support rigidity of the suspension tower rein hose 28 is improved.

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It is clear to the contractor. For example, the attachment surface 28A at the lower end of the suspension tower rein hose 28 and the cross member 40 are connected by a brace 34 formed of a steel plate, but may be connected by another compressive force support member such as a cylindrical pipe material. . Further, although the connecting means between the brace 34 and the vehicle body is a bolt and nut, other connecting means by welding or the like may be used.

  Further, although the suspension tower rein hose 28, which is a suspension attachment member, is extended by lowering the lower end portion to prevent the deformation, the present invention may be applied to other suspension attachment members such as the wheel house panel 26. .

1 is a perspective view of a vehicle body rear part structure according to a first embodiment of the present invention, viewed from the lower front side of a vehicle. FIG. 7 is a cross-sectional view taken along line 2-2 in FIG. 6, showing the vehicle body rear portion structure according to the first embodiment of the present invention, and viewing a suspension mounting portion from the front of the vehicle. FIG. 2 is an exploded perspective view of the vehicle body rear structure in FIG. 1, showing the vehicle body rear structure according to the first embodiment of the present invention. It is the bottom view which showed the vehicle body rear part structure which concerns on 1st Embodiment of this invention, and looked at the brace 34 part from the vehicle bottom. FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 6, showing the vehicle body rear portion structure according to the first embodiment of the present invention. 1 is a side view of a vehicle body rear portion structure according to a first embodiment of the present invention from the vehicle width direction. 1 is a bottom view of a vehicle body rear part structure according to a first embodiment of the present invention, viewed from below a vehicle. FIG. 8 is an end view taken along line 8-8 in FIG. 11 showing the vehicle body rear portion structure according to the second embodiment of the present invention and viewing the suspension mounting portion from the front of the vehicle. It is the bottom view which showed the vehicle body rear part structure which concerns on 2nd Embodiment of this invention, and looked at the brace 34 part from the vehicle bottom. FIG. 10 is a cross-sectional view taken along line 10-10 in FIG. 11, showing a vehicle body rear structure according to the second exemplary embodiment of the present invention. It is the side view which showed the vehicle body rear part structure which concerns on 2nd Embodiment of this invention, and was seen from the vehicle side.

Explanation of symbols

12 Rear floor panels (parts that make up floor members)
14 Side member 14E Bending part 26 Wheel house panel (Suspension mounting member)
28 Suspension Reinhose (Suspension mounting member)
28E Extension (first embodiment)
50E extension (second embodiment)
34 Brace (Reinforcing member)
40 Cross members (parts that make up floor members)

Claims (2)

A floor member of the vehicle body;
A side member provided on the outer side of the floor member in the vehicle width direction and disposed along the vehicle longitudinal direction;
Suspension is mounted in the upper part, is connected the side member to the intermediate portion Rutotomoni, suspension mounting surface is formed to extend in the vehicle width direction by bending the lower end portion of the extension portion extending in the vehicle below the side members A mounting member;
One end is connected to the mounting surface of the suspension mounting member, the other end is connected to the lower surface of the floor member, and a reinforcing member that prevents the suspension mounting member from falling down,
With
The floor member to which the reinforcing member is connected is a cross member extending in the vehicle width direction from the side member,
Said cross member and said side members are disposed at substantially the same height as pre Kinobe length portion and the reinforcing member and the cross member, and characterized by forming a substantially triangular space as seen from the vehicle longitudinal direction Car body rear structure.   A bent portion that is bent inward in the vehicle width direction in a plan view is provided at an intermediate portion in the longitudinal direction of the side member, and the cross member and the suspension mounting member are connected to the bent portion. The vehicle body rear part structure according to claim 1.

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