JP2005306324A - Vehicle body rear structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide vehicle body rear structure of an automobile capable of efficiently absorbing collision energy when the vehicle body rear part causes offset collision. <P>SOLUTION: A pair of right and left rear side members 1, 3 are extended to a vehicle body rear part along the longitudinal direction of the vehicle, and rear pillars 9, 11 are arranged on a vehicle body rear end along the vertical direction. A mounting bracket 21 of a wire 15 is provided on the upper part of the one side of both right and left sides in the rear pillars 9, 11, and the end part of the inextensible wire 15 is fixed to the mounting bracket 21. The wire 15 is extended from the mounting bracket 21 to the lower end part of the rear pillars 9, 11, extended from the lower end part toward other side opposite side of the mounting bracket 21, and is extended from the rear end of the rear side members 1, 3 of the other side toward the front to be fixed at the front fixing part 47. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rear body structure of an automobile, and more particularly, to a rear body structure of an automobile that can efficiently absorb collision energy when a rear collision occurs.

  In general, a pair of left and right rear side members extend along the vehicle front-rear direction at the rear of the automobile, and the rear ends of the rear side members are bridged via a rear end cross that extends in the vehicle width direction.

When a rear collision occurs in the vehicle, an axial (longitudinal) collision load is input to the rear side member, and the rear side member collapses in the axial direction to absorb the collision load (for example, Patent Document 1).
JP 2002-29457 A

  However, in the conventional example, in the case of a so-called offset collision in which only the left and right sides of the vehicle are subjected to a collision, the rear side member on the collision receiving side receives a collision load directly from the collision object and deforms to absorb the collision energy. Since the rear side member on the side not subjected to the collision is not directly input with the collision load, the rear side member is deformed so as to be dragged and bent by the rear end cross or the like, and the absorption amount of the collision energy is small. For this reason, the amount of collision energy absorbed by the deformation of the rear side member differs between the collision side and the non-collision side, and the energy absorption amount of the vehicle as a whole decreases. Therefore, the strength is increased by increasing the thickness of the rear side member. There is a problem that it is necessary to increase weight and cost.

  In addition, in order to apply an axial collision load to the rear side member on the non-collision side, there is a measure to increase the strength by increasing the thickness of the rear end cross that connects the left and right rear side members. There has been a problem that it causes an increase in weight and cost.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle body rear structure that can efficiently absorb collision energy when the rear portion of the vehicle causes an offset collision.

  In order to achieve the above object, a vehicle body rear structure according to the present invention includes a pair of left and right rear side members extending along the vehicle front-rear direction at the vehicle body rear portion, and a vehicle body member extending along the vertical direction at the vehicle rear end. A linear member mounting portion is provided on an upper portion of one of the left and right sides of the vehicle body member, and an end portion of the non-stretchable linear member is fixed to the vehicle body member mounting portion. Extending from the mounting portion to the lower end portion of the vehicle body member, extending from the lower end portion toward the other side opposite to the side where the mounting portion is provided, and further, the rear end of the rear side member on the other side By extending from the front to the front, when a collision load is applied to one side of the vehicle body member, an axial compressive load is input to the rear side member on the other side.

  According to the rear body structure of an automobile according to the present invention, even when the rear part of the vehicle causes an offset collision, tension is applied to the linear member along with the deformation of the body member, and the rear side member on the opposite side to the side on which the collision is received. Compressive load is input. On the other hand, a compression load due to a collision load is directly input to the rear side member on the side subjected to the collision by an offset collision. As a result, the magnitude of the compressive load input to the left and right rear side members becomes substantially equal to the left and right, and the collision energy can be efficiently absorbed by the left and right rear side members.

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

[First embodiment]
FIG. 1 is a perspective view showing a rear structure of a vehicle body of the present invention, and FIG. 2 is a plan view of FIG.

  A pair of left and right rear side members 1 and 3 extend along the vehicle longitudinal direction at the rear of the vehicle body. The rear side members 1 and 3 extend substantially in parallel at a predetermined interval, and the front end portion thereof is bridged by a cross member 5 and the rear end portion thereof is bridged by a rear end cross 7. Further, rear pillars (vehicle body members) 9 and 11 extending upward are disposed at both ends of the rear end cross 7 in the vehicle width direction. A back door (vehicle body member) 13 is provided, which is configured to be openable and closable around the rotation shaft.

  FIG. 3 is a perspective view showing a vehicle body rear portion structure according to the first embodiment of the present invention, and FIG. 4 is a perspective view showing another vehicle body rear portion structure.

  In the present embodiment, a wire 15 as a linear member is stretched from the rear pillars 9 and 11 through the rear end cross 7 to the rear side members 1 and 3. The rear pillars 9 and 11, the rear end cross 7 and the rear side members 1 and 3 are all formed in a cylindrical closed cross-sectional structure, and the wire 15 is disposed inside the closed cross-sectional structure. 3 shows the case where the wire 15 is provided from the right rear pillar 9 to the left rear side member 3, and FIG. 4 is the opposite, FIG. 4 shows the case where the wire 15 is provided from the left rear pillar 11 to the right rear side member 1. Shows the case.

  FIG. 5 is an enlarged perspective view of the rear pillar upper end portion of FIG. 3, and FIG. 6 is a plan view of FIG. 5 viewed from above.

  As shown in these drawings, the rear pillar 9 is formed in a U-shaped cross section, and a rear pillar body 17 having an opening side facing the front of the vehicle, and a joining panel 19 joined to the front side of the rear pillar body 17. To a closed cross-sectional structure having a rectangular cross section. A mounting bracket 21, which is a mounting portion of the wire 15, is fixed to the upper end of the planar joining panel 19 inside the rear pillar 9. The mounting bracket 21 includes a rectangular plate portion 23 and a semi-cylindrical protruding portion 25 that is integrally formed with the plate portion 23 and protrudes toward the rear of the vehicle. A mounting hole is formed along the direction. The end portion of the wire 15 is rounded into a ring shape and attached through the attachment hole of the protruding portion 25.

  Then, the wire 15 extends downward from the mounting bracket 21 inward of the rear pillar 9, and the extending direction is converted by about 90 ° at the pulley 27 provided at the lower end of the rear pillar 9 as shown in FIG. 7. The interior of the rear end cross 7 extends along the vehicle width direction. Further, an insertion hole 29 for the wire 15 is formed on the upper surface of the rear end cross 7, and the wire 15 passes through the rear end cross 7 through the insertion hole 29.

  FIG. 8 is an enlarged perspective view showing the pulley of FIG.

  The pulley 27 includes a support member 31 fixed to the lower surface of the rear pillar 9, a pulley body 33 rotatably supported on the support member 31, and a support shaft 35 that pivotally supports the pulley body 33 on the support member 31. It is composed of The support member 31 is formed with projecting portions 37 and 37 that are spaced apart from each other in the vertical direction, and the projecting portions 37 and 37 are provided with insertion holes 39 through which the support shaft 35 is inserted. . Further, the pulley body 33 has a mounting hole 41 formed in the center thereof, and is formed in a concave shape whose outer peripheral surface is curved. Then, with the mounting hole 41 of the pulley 33 aligned with the insertion holes 39, 39 of the projecting portions 37, 37, the mounting hole 41 and the insertion holes 39, 39 are inserted by the support shaft 35 to support the shaft. doing.

  FIG. 9 is a cross-sectional view of the rear side member of FIG.

  A wire 15 is stretched on the bottom surface 43 of the rear side member 3. That is, as will be described later, the rear side member 3 is formed in a substantially U-shaped cross section and is joined to the upper floor 45 to form a closed cross section structure. A fixing portion 47 of the wire 15 is provided at the front portion of the bottom surface 43 of the rear side member 3, and the tip of the wire 15 is supported by the fixing portion 47. The wire 15 extends from the fixed portion 47 along the bottom surface of the rear side member 3 toward the rear of the vehicle.

  Next, with reference to FIGS. 10 and 11, a load transmission path when the rear part of the vehicle causes an offset collision will be described.

  As shown in FIG. 10, the wire 15 is stretched along the vertical direction on the left side of the vehicle rear end surface 49 shown schematically (that is, the left rear pillar 11 in FIG. 4). And if the collision load F is input into the left side of the vehicle rear end surface 49, as shown in FIG. 11, the wire 15 will also curve ahead convexly. Then, the tension T acts on the whole wire 15, and the load of the direction which compresses the rear side member 1 (refer FIG. 4) acts.

  In addition, the effect which stretches the wire 15 on the bottom face 43 of the rear side members 1 and 3 is demonstrated using FIGS. 12 is a perspective view showing the rear side member of FIG. 1, FIG. 13 is a sectional view taken along line AA of FIG. 12, FIG. 14 is a schematic side view of the rear side member of FIG. FIG. 5 is a schematic side view showing a rear side member that has undergone axial deformation.

  As shown in FIGS. 12 and 13, the rear side members 1 and 3 having a substantially U-shaped cross section are joined to the lower surface of the floor 45 with the opening side of the rear side members 1 and 3 facing upward. Here, since the plate thickness of the rear side members 1 and 3 is formed larger than the plate thickness of the floor 45, the rear side members 1 and 3 have higher strength than the floor 45.

  Therefore, as shown in FIGS. 14 and 15, when an axial compressive load is input to the rear side members 1, 3, the amount of compressive deformation on the floor 45 side is large, and the amount of compressive deformation on the rear side members 1, 3 side is large. Becomes smaller. Therefore, it becomes a deformation of the folding mode in which the center part of the rear side members 1 and 3 is deformed downward. Therefore, if the wire 15 is stretched along the bottom surface 43 of the rear side members 1 and 3, tension is applied to the wire 15 and an axial compressive load is applied to the bottom surface 43 of the rear side members 1 and 3, the rear side member 1. , 3 can balance the compression load between the upper side and the lower side, and the rear side members 1 and 3 can be efficiently prevented from being bent.

  Below, the effect by this embodiment is demonstrated.

  A pair of left and right rear side members 1, 3 extend along the vehicle longitudinal direction at the rear of the vehicle body, and rear pillars 9, 11 are disposed along the vertical direction at the rear end of the vehicle body, and one of the left and right sides of the rear pillars 9, 11 is arranged. An attachment bracket 21 for the wire 15 is provided on the upper side, the end of the non-stretchable wire 15 is fixed to the attachment bracket 21, and the wire 15 extends from the attachment bracket 21 to the lower ends of the rear pillars 9 and 11. From this lower end, it extends toward the other side opposite to the side on which the mounting bracket 21 is provided, and further extends forward from the rear end of the rear side members 1 and 3 on the other side. It is fixed by the fixing part 47 of the part. Therefore, even when an offset collision occurs in the rear part of the vehicle, tension is applied to the wire 15 as the rear pillars 9 and 11 are deformed, and a compressive load is input to the rear side members 1 and 3 on the side opposite to the side on which the collision is received. . On the other hand, a compression load due to a collision load is directly input to the rear side members 1 and 3 on the side subjected to the collision by an offset collision. As a result, the magnitude of the compressive load input to the left and right rear side members 1 and 3 and the amount of axial deformation of the rear side members 1 and 3 become substantially equal to each other, and collision energy can be absorbed efficiently.

  The rear side members 1 and 3 are formed in a substantially U-shaped cross section, and are fixed to the lower surface of the floor 45 with the opening side facing up, and the wire 15 is provided along the bottom surface 43 of the rear side members 1 and 3. The rear side members 1 and 3 can be compressed and deformed along the axial direction without causing bending deformation, and the collision energy can be efficiently absorbed.

  That is, the upper part of the rear side members 1 and 3 is the floor 45, and since the strength is smaller than that of the lower part, the amount of compressive deformation is smaller on the lower side. However, when the wire 15 is stretched along the bottom surface 43, a compressive load is positively applied to the lower side, so that the amount of compressive deformation is substantially uniform at the upper and lower portions, and collision energy is efficiently absorbed. Can do.

  As shown in FIGS. 3 and 4, the fixing portion 47 is provided in a portion having a high strength such as the vicinity of the coupling portion between the rear side members 1 and 3 and the cross member 5. Thereby, the axial compressive load can be reliably applied to the rear side members 1 and 3.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 16 is a perspective view showing a vehicle rear portion structure according to the second embodiment of the present invention, and FIG. 17 is a perspective view showing another vehicle rear portion structure according to the second embodiment of the present invention.

  16 shows a case where the wire 15 is provided from the right rear pillar 9 to the left rear side member 3, and FIG. 17 conversely, the wire 15 is stretched from the left rear pillar 11 to the right rear side member 1. Shows the case.

  In the present embodiment, the wire 15 as a linear member is stretched from the rear pillars 9 and 11 through the rear end cross 7 and the pulley 50 to the rear side members 1 and 3. The wires 15 are stretched from the rear ends of the rear side members 1 and 3 through a pulley 51 which is a support portion provided at the front portion. This will be specifically described with reference to FIG.

  A pulley 51 is provided in the vicinity of the connecting portion of the rear end cross 7 to the rear side member 3 and in the front end portion of the rear side member 3, and in this pulley 51, the direction in which the wire 15 is stretched is changed by about 90 ° or 180 °. A wire take-up device 53 is disposed at the rear end of the rear side member 3. As shown in FIGS. 19 and 20, the wire winding device 53 has a worm 57, a worm wheel 59, and a winding body 61 that can freely rotate inside a rectangular tube-shaped housing 55 whose front side is open. It is pivotally supported. The worm wheel 59 and the winding body 61 are attached to the same support shaft, and are arranged orthogonal to each other with respect to the support shaft of the worm. The worm 47 and the worm wheel 59 are meshed with each other, and the wire 15 is wound around the outer periphery of the winding body 61, and the wire 15 is instantaneously wound by the rotation of the winding body 61. It is configured as follows.

  Next, as shown in FIG. 21, when an offset collision occurs on the right side of the rear part of the vehicle, a collision load F is input to the center part of the right rear pillar 11 to bend and project toward the front of the vehicle, The wire 15 stretched on the rear pillar 11 is also bent to generate a tension T. The tension T of the wire 15 is transmitted to the wire 15 of the rear side member 3 through the wire 15 of the rear end cross 7. Here, in the rear side member 3, since the wire 15 is stretched so as to reciprocate via the pulley 51 provided in the front portion, the pulley 51 has a tension T from the two wires 15. Acts behind the vehicle. Therefore, a compressive load twice as large as that of the first embodiment is applied to the rear side member 3 in the axial direction.

  In the schematic perspective views shown in FIGS. 22 and 23, as in the case of FIG. 21, the rear side members 1 and 3 (see FIG. 21) are stretched between the pulley 51 and the wire winding device 53. The state where the rear side members 1 and 3 receive a compressive load in the axial direction is shown by the formed wire 15.

  According to this embodiment, it has the following effects.

  A pulley 51 for the wire 15 is provided at the front part of the rear side members 1, 3. The wire 15 extends forward from the rear end of the rear side members 1, 3, and is folded back by the pulley 51 to extend backward. Since the rear side members 1 and 3 are fixed to the rear ends of the rear side members 1 and 3, when an offset collision occurs in the rear part of the vehicle, the axial compressive load input to the non-collision side rear side members 1 and 3 is folded back. Since it is input via the wire 15 having a double-wire shape, the compressive load of the rear side members 1 and 3 on the non-collision side becomes larger than that in the case of the first embodiment. Therefore, the absorption efficiency of the collision load by the rear side members 1 and 3 at the time of the offset collision can be further increased.

  As shown in FIGS. 16 and 17, the pulley 51 is provided in a portion having a high strength such as the vicinity of the coupling portion between the rear side members 1 and 3 and the cross member 5. Thereby, the axial compressive load can be reliably applied to the rear side members 1 and 3.

[Third embodiment]
Next, the third embodiment will be described. The same parts as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the present embodiment, a wire 15 that is a linear member is stretched inside the back door 13.

  24 and 25 are perspective views showing a vehicle body rear structure according to the third embodiment of the present invention, and the rear pillar is omitted for the sake of simplicity.

  A back door 13 is disposed at the rear end of the vehicle along the top and bottom and the left and right. The back door 13 includes an inner panel 63 on the front side of the vehicle and an outer panel 65 disposed on the rear side of the vehicle and coupled to the inner panel 63, and is closed by the outer panel 65 and the inner panel 63. It has a cross-sectional structure. A wire 15 is stretched along the vertical direction at the right end of the back door 13. That is, the mounting bracket 67 of the wire 15 is provided at the inner upper end of the back door 13, and the wire 15 extends downward from the mounting bracket 67. As in the first and second embodiments, the wire 15 is stretched from the rear end cross 7 to the rear side members 1 and 3.

  In the present embodiment, an opening / closing mechanism (not shown) is provided so that the opening / closing operation of the back door 13 is not hindered by the wire 15. As this opening / closing mechanism, for example, there is a method in which, when the back door 13 is opened and closed, the mounting bracket 67 slides up and down so that no tension is generated in the wire 15.

  According to the present embodiment, the back door 13 is constituted by the inner panel 63 and the outer panel 65, and the wire 15 is disposed inside the back door 13, so that the amount of deformation due to the collision is not so large. Even in a collision, the wire 15 is bent and tension is generated, and a compressive load is generated on the rear side members 1 and 3 on the non-collision side.

It is a perspective view which shows the vehicle body rear part structure of this invention. It is a top view of FIG. 1 is a perspective view showing a vehicle body rear structure according to a first embodiment of the present invention. It is a perspective view which shows another vehicle body rear part structure by 1st Embodiment of this invention. It is a perspective view which expands and shows the rear pillar upper end part of FIG. FIG. 6 is a plan view of FIG. 5 viewed from above. It is a front view which expands and shows the rear pillar lower end part of FIG. It is a perspective view which expands and shows the pulley of FIG. It is sectional drawing in the rear side member of FIG. FIG. 5 is a schematic perspective view illustrating a relationship between a deformed state of a wire and a direction of tension when a collision load is input to the rear part of the vehicle body in FIG. 4. FIG. 5 is a schematic perspective view illustrating a relationship between a deformed state of a wire and a direction of tension when a collision load is input to the rear part of the vehicle body in FIG. 4. It is a perspective view which shows the rear side member of FIG. It is sectional drawing by the AA line of FIG. It is the schematic side view which looked at the rear side member of FIG. 12 from the side. It is a schematic side view which shows the rear side member which raise | generated the deformation | transformation of the axial direction. It is a perspective view which shows the vehicle body rear part structure by 2nd Embodiment of this invention. It is a perspective view which shows another vehicle body rear part structure by 2nd Embodiment of this invention. It is sectional drawing which looked at the rear side member vicinity of FIG. 16 from upper direction. It is an enlarged view of FIG. It is sectional drawing which expanded the rear side member rear-end part of FIG. 18 and was seen from the side. FIG. 17 is a perspective view illustrating a relationship between a deformed state of a wire and a direction of tension when a collision load is input to the rear pillar in FIG. 16. FIG. 18 is a schematic perspective view showing the relationship between the deformation state of the wire and the direction of tension when a collision load is input to the rear part of the vehicle body in FIG. 17. FIG. 18 is a schematic perspective view showing the relationship between the deformation state of the wire and the direction of tension when a collision load is input to the rear part of the vehicle body in FIG. 17. It is a perspective view which shows the vehicle body rear part structure by 3rd Embodiment of this invention. It is a perspective view which shows another vehicle body rear part structure by 3rd Embodiment of this invention.

Explanation of symbols

1,3 ... Rear side member 9,11 ... Rear pillar (body member)
13. Back door (body member)
15 ... Wire (Linear member)
21 ... Mounting bracket (mounting part)
43 ... Bottom 45 ... Floor 51 ... Pulley (support)

Claims (5)

  A pair of left and right rear side members are extended along the longitudinal direction of the vehicle at the rear of the vehicle body, and a vehicle body member is disposed along the vertical direction at the rear end of the vehicle body. An attachment portion of the member is provided, the end portion of the non-stretchable linear member is fixed to the attachment portion of the vehicle body member, the linear member is extended from the attachment portion to the lower end portion of the vehicle body member, and from the lower end portion, A collision load is applied to one side of the vehicle body member by extending toward the other side opposite to the side where the mounting portion is provided, and further extending from the rear end of the rear side member toward the front on the other side. A vehicle body rear structure, characterized in that an axial compressive load is input to the rear side member on the other side when the pressure is applied.   The vehicle body rear structure according to claim 1, wherein the vehicle body members are cylindrical rear pillars provided on both left and right sides of the vehicle body, and linear members are provided inward of the rear pillars.   The vehicle body rear structure according to claim 1, wherein the vehicle body member is a back door, and a linear member is provided inward of the back door.   A support portion for a linear member is provided at the front portion of the rear side member, the linear member is extended from the rear end of the rear side member toward the front, is folded back at the support portion and is extended toward the rear, The vehicle body rear part structure according to any one of claims 1 to 3, wherein the rear body member is fixed to a rear end of the rear side member.   2. The rear side member is formed in a substantially U-shaped cross section, fixed to the lower surface of the floor with its opening side facing upward, and a linear member is routed along the bottom surface of the rear side member. The vehicle body rear part structure of any one of -4.

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