JP6084493B2 - Lower body structure of the vehicle - Google Patents

Description

  The present invention relates to a vehicle body lower part structure for improving the coupling rigidity between a rear end part of a rocker formed at a lower end edge part of a side wall and a front end part of a rear side member.

  Conventionally, the vehicle body lower part structure of the vehicle is disclosed in Patent Document 1 below. According to this publication, the lower body structure of the vehicle includes a left and right rocker that is formed at the lower edge of the left and right side walls of the vehicle body and extends in the longitudinal direction of the vehicle body, and a rocker rear end that constitutes the rear end of each rocker. The left and right rear side members are connected to the rear end portion of the rocker.

  In the above case, in order to improve the coupling rigidity of the coupling portion between the rocker rear end portion and the front end portion of the rear side member, the rocker rear end portion bulges toward the inner side of the vehicle body in the width direction of the vehicle body. A projecting portion is formed, and the front end portion of the rear side member is coupled to the arc-shaped projecting surface of the projecting portion by spot welding.

JP-A-5-162661

  By the way, in the conventional technique, the rocker rear end portion and the front end portion of the rear side member are joined by spot welding only on the arcuate projecting surface of the projecting portion formed at the rear end portion of the rocker at the front end portion of the rear side member. It is made by. For this reason, when any object collides with the vehicle from behind (a rear impact), a large shearing force tends to act on the coupling portion based on a large impact force at the time of the rear impact. Then, due to this shearing force, a large shearing stress is generated in each spot welded portion in the coupling portion, and the front end portion of the rear side member is peeled off from the arcuate projecting surface, and the vehicle body may be largely deformed.

  Therefore, it is conceivable to provide a separate reinforcing material that reinforces the joint between the rocker protrusion and the front end of the rear side member. However, this is not preferable because the number of parts of the vehicle body increases, the forming operation becomes complicated, and the productivity may decrease.

  The present invention has been made paying attention to the above-described circumstances, and an object of the present invention is to prevent the rear end portion of the rocker in the vehicle body and the front end portion of the side member against the impact force at the time of rear-end collision to the vehicle. The coupling portion is sufficiently strong to prevent the vehicle body from being greatly deformed, and even in such a case, the vehicle body productivity should be maintained well. .

According to the first aspect of the present invention, a left and right rocker 9 formed at the lower edge of the left and right side walls 8 of the vehicle body 2 and extending in the front-rear direction of the vehicle body 2 and a rocker rear end portion 11 constituting the rear end portion of each rocker 9 are provided. In the vehicle body lower part structure having left and right rear side members 12 that extend rearward from the rear and whose front end portion is coupled to the rocker rear end portion 11,
In plan view of the vehicle body 2 (FIG. 1), the width of the rear portion 11b of the front and rear portions 11a and 11b of the rocker rear end portion 11 is increased toward the inner side of the vehicle body 2 toward the rear of the vehicle body 2. A space 42 that opens rearward is formed in the rear portion 11 b of the rocker rear end portion 11, while the front end portion of the rear side member 12 is inserted into the space 42 in a tapered shape and joined to the rocker rear end portion 11. This is a vehicle body lower part structure.

  In the invention of claim 2, the rear portion 11b of the rocker rear end portion 11 is branched to form left and right branch portions 43 and 44, the space 42 is formed between the left and right branch portions 43 and 44, and the left and right branch portions are formed. Among the portions 43 and 44, the branch portion 43 on the outer side of the vehicle body 2 is positioned on a virtual extension line toward the rear of the front portion 11a of the rocker rear end portion 11, and the cross-section of each portion in the longitudinal direction is It is formed so as to be almost the same shape and size as the front portion 11a, and the branch portion 44 on the inner side of the vehicle body 2 extends from the front portion 11a of the rocker rear end portion 11 toward the rear and the inner side of the vehicle body 2. The vehicle body lower part structure according to claim 1, wherein the vehicle body lower part structure is formed so as to protrude.

  In addition, in this section, the reference numerals and drawing numbers appended to the above terms are not intended to limit the technical scope of the present invention to the “Example” section and the contents of the drawings described later.

  The effects of the present invention are as follows.

According to the first aspect of the present invention, the left and right rockers that are formed at the lower end edges of the left and right side walls of the vehicle body and extend in the front-rear direction of the vehicle body, and the rocker rear end portions that constitute the rear end portions of these rockers extend from the rear toward the rear. In the vehicle body lower part structure of the vehicle provided with left and right rear side members whose front end part is coupled to the rocker rear end part,
In plan view of the car body, the width of the rear part of the front and rear parts of the rocker rear end part is increased inward toward the rear of the car body, and the rear part of the rocker rear end part is directed rearward. On the other hand, a front end portion of the rear side member is inserted into the space in a tapered shape and joined to the rocker rear end portion.

  For this reason, since the front end portion of the rear side member is engaged and coupled with the rear portion of the rocker rear end portion of the rocker in a wedge shape, an impact toward the front of the vehicle body on the rear side member due to a rear impact on the vehicle. When a force is applied, a compressive force tends to be applied to the connecting portion between the rear portion of the rocker rear end portion and the front end portion of the rear side member. Therefore, the coupling rigidity of the coupling portion is effectively improved as compared with the case where a shearing force is applied to the coupling portion at the time of rear collision as in the conventional technique described above.

  In addition, as described above, the width of the rear portion of the rear end portion of the rocker is increased toward the rear of the vehicle body, while the front end portion of the rear side member is tapered so that they are coupled to each other. For this reason, the cross-sectional change in each part in the front-rear direction of the vehicle body at the connecting portion between the rear portion of the rocker rear end portion and the front end portion of the rear side member is suppressed to be small.

  Therefore, first, it is possible to prevent stress concentration from occurring in any part of the coupling portion due to the impact force at the time of rear collision. For this reason, the joint portion sufficiently resists the impact force, and the joint portion is more reliably prevented from breaking, that is, the vehicle body is more reliably prevented from being greatly deformed. The Second, it is also possible to prevent stress concentration from occurring in any part of the coupling portion due to some external force during traveling of the vehicle. For this reason, it is suppressed that a vehicle body twists from the said connection part as a starting point, the operativity of a vehicle improves, and the riding comfort to a vehicle improves.

  And the first and second effects such as prevention of deformation of the vehicle body at the time of the rear impact described above are to devise the shape of the joint portion between the rear portion of the rocker rear end portion of the rocker and the front end portion of the rear side member. Therefore, a separate reinforcing material may not be provided. Therefore, the increase in the number of parts of the vehicle body can be suppressed correspondingly, and the productivity can be maintained well.

  According to a second aspect of the present invention, the rear portion of the rocker rear end portion is branched to form left and right branch portions, the space is formed between the left and right branch portions, and the outer side of the vehicle body of the left and right branch portions is The bifurcated portion is positioned on a virtual extension line toward the rear of the front portion of the rocker rear end portion, and each cross section in the longitudinal direction is formed to be substantially the same shape and size as the front portion. A branch portion on the inner side is formed so as to extend from the front portion of the rear end portion of the rocker toward the rear and the inner side of the vehicle body.

  Here, as described above, when the left and right branch portions are formed in the rear portion of the rocker rear end portion of the rocker and a space is formed between them, the rigidity of the rocker rear end portion may be lowered. .

  However, as described above, of the left and right branch portions, the branch portion on the outer side of the vehicle body is positioned on the extension line toward the rear of the front portion of the rear end portion of the rocker, and the cross section of each part in the longitudinal direction Is formed so as to be approximately the same shape and size as the front portion. For this reason, the rigidity of the rear end portion of the rocker is well maintained by the front portion and the bifurcated portion of the outer side of the vehicle body described above. Therefore, even at this point, the connecting portion between the rear portion of the rocker rear end portion and the front end portion of the rear side member sufficiently resists the impact force at the time of the rear collision, and the connecting portion is not broken. Furthermore, it is reliably prevented. .

It is a fragmentary top view of a vehicle body rear lower part. It is a side view of the rear lower part of a vehicle body. (A) is the III (a) -III (a) arrow expanded sectional view of FIG. (B) is the III (b) -III (b) arrow expanded sectional view of FIG. (A) is an IV (a) -IV (a) arrow expanded sectional view of FIG. FIG. 4B is an enlarged sectional view taken along line IV (b) -IV (b) in FIG. 1. FIG. 3 is a partial perspective view of what is shown in FIGS. FIG. 6 is a development view of what is shown in FIG. 5.

  The vehicle body lower part structure of the present invention relates to the impact force at the time of rear-end collision to the vehicle, and the joint portion between the rocker rear end portion and the front end portion of the side member sufficiently opposes the strength of the vehicle body. In order to realize the object of preventing the large deformation and maintaining the productivity of the vehicle body even in such a case, the form for carrying out the present invention is It is as follows.

  In other words, the lower body structure of the vehicle has a left and right rocker that is formed at the lower edge of the left and right side walls of the vehicle body and extends in the longitudinal direction of the vehicle body, and the rear end of the rocker that constitutes the rear end of each rocker. And left and right rear side members whose front ends are coupled to the rear end of the rocker.

  In plan view of the car body, the width of the rear part of the front and rear parts of the rocker rear end part is increased inward toward the rear of the car body, and rearward of the rear part of the rocker rear part. An open space is formed. On the other hand, the front end portion of the rear side member is inserted into the space as a tapered shape, and is coupled to the rocker rear end portion.

  In order to explain the present invention in more detail, an embodiment thereof will be described with reference to the accompanying drawings.

  In the figure, reference numeral 1 is a vehicle exemplified by an automobile, and an arrow Fr indicates the front in the traveling direction of the vehicle 1. The left and right described below refer to the width direction of the vehicle body 2 of the vehicle 1 toward the front.

  The vehicle 1 includes the vehicle body 2 made of sheet metal and wheels 4 suspended from the vehicle body 2 by suspensions 3. The interior of the vehicle body 2 is a vehicle compartment 5.

  The vehicle body 2 is formed at the lower edge of the left and right side walls 8 forming the left and right side surfaces of the vehicle compartment 5 and extends in the front-rear direction of the vehicle body 2. The vehicle body 2 is disposed between the left and right rocker 9. The left and right front side members 10 extending in the front-rear direction and the rocker rear end portion 11 constituting the rear end portion of each rocker 9 extend rearward from the right side, and the front end portion is coupled to the rocker rear end portion 11. A member 12, a front cross member 13 that extends in the width direction of the vehicle body 2 and connects the rear end portions of the left and right front side members 10 and the front end portions of the left and right rear side members 12 to each other; A middle part and rear cross members 14 and 15 are provided that extend in the width direction and join the middle parts of the left and right rear side members 12 and the rear end parts to each other.

  In the above case, the lower portion of the rocker 9 and each front side member 10 are positioned at substantially the same height. Further, the upper part of the rocker 9 and the front part and front cross member 13 of each rear side member 12 are positioned at substantially the same height. As a result, the front portion of each rear side member 12 and the front cross member 13 are positioned one step higher than each front side member 10. The rear end portion of each front side member 10 is coupled to the lower surface of the midway portion of the front cross member 13 in the longitudinal direction.

  Each of the above connections is by spot welding, and the same shall apply hereinafter. Each of the constituent members 9 to 15 of the vehicle body 2 described above has sufficient rigidity and serves as a skeleton member of the vehicle body 2.

  A floor panel 18 that is supported on the upper surface of each component of the vehicle body 2 and forms the lower surface of the passenger compartment 5 is provided. The floor panel 18 includes a front floor panel 19 that forms a front wing with respect to the front surface of the front cross member 13, and a rear floor panel that forms a back wing and is positioned one step higher than the front floor panel 19. 20 and a connecting panel 21 that extends in the vertical direction and connects the rear end edge of the front floor panel 19 and the front end edge of the rear floor panel 20.

  The rocker 9 includes a rocker outer and rocker inner panels 25 and 26 that face each other in the width direction of the vehicle body 2, and a rocker reinforcing panel 27 that is sandwiched between the rockers 25 and 26 and improves the rigidity of the rocker 9. ing. Each section in the longitudinal direction of the rocker outer panel 25 has a hat shape that opens toward the inside of the vehicle body 2, and each section in the longitudinal direction of the rocker inner panel 26 opens toward the outside of the vehicle body 2. It is a hat shape, and each cross section in the longitudinal direction of the rocker 9 has a hollow closed cross-sectional structure.

  The front side member 10, the rear side member 12, the front cross member 13, and the midway cross member 14 each have a hat shape in which each longitudinal section thereof opens upward or downward, and faces each other in the horizontal direction. A pair of vertical plates 30, 30, a bottom plate 31 that joins one edge of the vertical plates 30, 30 in the vertical direction, and a pair formed at the other edge of the vertical plates 30, 30. Are formed integrally by pressing a single panel material.

  The suspension 3 includes a box-shaped bracket 35 coupled to the rocker inner panel 26 of the rear portion 11 b of the rocker rear end portion 11 and the lower surface of the front end portion of each rear side member 12, and below each rear side member 12. The left and right suspension arms 37 that are arranged and extend in the front-rear direction of the vehicle body 2 and are coupled to each other by the cross member 36, and the front end portions of the suspension arms 37 are elastically attached to the bracket 35 so that the rear portions of the suspension arms 37 can be turned up and down A pivot shaft 38 that pivots via a material, a shock absorber 39 and a coil spring (not shown) installed on each suspension arm 37 and the rear side member 12 are provided.

  In the vehicle 1 having the above-described configuration, when the width dimension of the rear portion 11b of the front and rear portions 11a and 11b of the rocker rear end portion 11 is rearward of the vehicle body 2 in a plan view of the vehicle body 2 (FIG. 1), Increased inward. Thereby, a space 42 opened rearward is formed in the rear portion 11b of the rocker rear end portion 11.

  Specifically, the rear portion 11 b of the rocker rear end portion 11 is branched toward the rear of the vehicle body 2 to form left and right branch portions 43 and 44, and the space 42 is defined between the left and right branch portions 43 and 44. It is formed. Of the left and right branch parts 43, 44, the branch part 43 on the outer side of the vehicle body 2 is positioned on a virtual extension line that linearly goes to the rear of the front part 11a of the rocker rear end part 11, and Each section in the longitudinal direction is formed so as to be substantially the same shape and size as the front part 11a.

  In the above case, the rocker inner panels 26 at the front and rear portions 11a and 11b of the rocker rear end portion 11 are formed separately from each other and then coupled to each other. The rocker inner panels 26 at the front and rear portions 11a and 11b of the rocker rear end portion 11 may be formed integrally with each other.

  Of the left and right branch parts 43, 44, the branch part 44 on the inner side of the vehicle body 2 is formed to extend from the front part 11 a of the rocker rear end part 11 toward the rear and the inner side of the vehicle body 2. The Specifically, the branch portion 44 on the inner side of the vehicle body 2 includes a substrate 47 that integrally extends from the front portion 11a of the rocker rear end portion 11 toward the rear and the inner side of the vehicle body 2, and The board 47 is formed separately from the board 47 and has an extension plate 48 that extends from the board 47 side toward the rear and inward of the vehicle body 2 and has a front portion coupled to the board 47.

  Further, the upper reinforcing plate 49 that integrally extends from the extended edge of the extension plate 48 toward the rear of the vehicle body 2 and the one from the lower edge of the extension plate 48 toward the outside of the vehicle body 2 are integrated. A lower reinforcing plate 50 is provided.

  In the plan view of the vehicle body 2 (FIG. 1), the front end portion of the rear side member 12 on the front side of the bracket 35 of the suspension 3 is tapered forward. The front end portion of the rear side member 12 is inserted into the space 42, and the left and right side portions of the rear side member 12 are coupled to the left and right branch portions 43 and 44 of the rocker rear end portion 11, respectively.

  The extension plate 48 is coupled to the outer surface of the vertically oriented plate 30 on the inner side of the vehicle body 2 having a tapered shape at the front end of the rear side member 12. Further, the end of the front cross member 13 is coupled to the extension plate 48. The front cross member 13 reinforces the connecting portion between the rocker rear end portion 11 and the front end portion of the rear side member 12.

  The upper reinforcing plate 49 is coupled to the outer surface of the vertical plate 30 on the inner side of the vehicle body 2 of the rear side member 12 and the outer surface of the outer surface of the vehicle body 2 of the bracket 35. The lower reinforcing plate 50 is coupled to the lower surface of the branching portion 43 on the outer side of the vehicle body 2 at the rear portion 11 b of the rocker rear end portion 11 of the rocker 9.

  For this reason, the bracket 35 includes an upper reinforcing plate 49 that extends from the branch plate 43 on the outer side of the vehicle body 2, the front portion of the rear side member 12, and the extension plate 48 of the branch portion 44 on the inner side of the vehicle body 2. , And the lower reinforcing plate 50 is supported so as to be firmly supported by the vehicle body 2. Therefore, the suspension support of the suspension arm 37 to the bracket 35 is stably performed, so that the operability of the vehicle 1 is improved.

  According to the above configuration, in the plan view of the vehicle body 2 (FIG. 1), as the width dimension of the rear portion 11 b of the front and rear portions 11 a and 11 b of the rocker rear end portion 11 increases toward the rear of the vehicle body 2, A space 42 that opens rearward is formed in the rear portion 11b of the rocker rear end portion 11 while the front end portion of the rear side member 12 is inserted into the space 42 in a tapered shape, and the rocker rear end portion is formed. 11 is connected.

  For this reason, the front end portion of the rear side member 12 is engaged and coupled to the rear portion 11b of the rocker rear end portion 11 of the rocker 9 in a wedge shape. When an impact force F directed toward the front of the vehicle body 2 is applied, a compressive force tends to be applied to the connecting portion between the rear portion 11 b of the rocker rear end portion 11 and the front end portion of the rear side member 12. Therefore, the coupling rigidity of the coupling portion is effectively improved as compared with the case where a shearing force is applied to the coupling portion at the time of rear collision as in the conventional technique described above.

  Moreover, as described above, the width dimension of the rear portion 11b of the rocker rear end portion 11 is increased toward the rear of the vehicle body 2, while the front end portion of the rear side member 12 is tapered so that these 11b and 12 are mutually connected. Combined. For this reason, the cross-sectional change in each part of the vehicle body 2 in the front-rear direction at the joint portion between the rear portion 11b of the rocker rear end portion 11 and the front end portion of the rear side member 12 is suppressed to a small extent.

  Therefore, first, it is possible to prevent stress concentration from occurring in any part of the coupling portion due to the impact force F at the time of rear collision. For this reason, the joint portion sufficiently resists the impact force F, and the joint portion is more reliably prevented from breaking, that is, the vehicle body 2 is more reliably deformed greatly. Is prevented. Second, it is also possible to prevent stress concentration from occurring in any part of the coupling portion due to some external force during traveling of the vehicle 1. For this reason, it is suppressed that the vehicle body 2 is twisted starting from the coupling portion, and the operability of the vehicle 1 is improved and the riding comfort of the vehicle 1 is improved.

  The effect of preventing the deformation of the vehicle body 2 at the time of the rear collision is achieved by devising the shape of the joint portion between the rear portion 11b of the rocker rear end portion 11 of the rocker 9 and the front end portion of the rear side member 12. This is possible, and a separate reinforcing material may not be provided. Therefore, the increase in the number of parts of the vehicle body 2 can be suppressed correspondingly, and the productivity can be maintained well.

  Further, as described above, the rear portion 11b of the rocker rear end portion 11 is branched to form the left and right branch portions 43 and 44, the space 42 is formed between the left and right branch portions 43 and 44, and the left and right branch portions are formed. Among the portions 43 and 44, the branch portion 43 on the outer side of the vehicle body 2 is positioned on a virtual extension line toward the rear of the front portion 11a of the rocker rear end portion 11, and the cross-section of each portion in the longitudinal direction is It is formed so as to be almost the same shape and size as the front portion 11a, and the branch portion 44 on the inner side of the vehicle body 2 extends from the front portion 11a of the rocker rear end portion 11 toward the rear and the inner side of the vehicle body 2. It is formed to be put out.

  Here, as described above, when the left and right branch portions 43 and 44 are formed in the rear portion 11b of the rocker rear end portion 11 of the rocker 9 and the space 42 is formed therebetween, the rocker rear end portion 11 is formed. This may reduce the rigidity of the steel.

  However, as described above, of the left and right branch parts 43 and 44, the branch part 43 on the outer side of the vehicle body 2 is positioned on an extension line extending rearward of the front part 11 a of the rocker rear end part 11. The cross-section of each part in the longitudinal direction is formed to be substantially the same shape and size as the front part 11a. For this reason, the rigidity of the rocker rear end portion 11 is well maintained by the front portion 11a and the branch portion 43 on the outer side of the vehicle body 2 described above. Therefore, also in this respect, the connecting portion between the rear portion 11b of the rocker rear end portion 11 and the front end portion of the rear side member 12 sufficiently resists the impact force F at the time of the rear collision, and this connecting portion is Breaking is more reliably prevented.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Car body 3 Suspension 4 Wheel 5 Car compartment 8 Side wall 9 Rocker 10 Front side member 11 Rocker rear end part 11a Front part 11b Rear part 12 Rear side member 13 Front cross member 25 Rocker outer panel 26 Rocker inner panel 27 Rocker reinforcement panel 35 Bracket 37 Suspension arm 38 Pivot shaft 42 Space 43 Branching portion 44 Branching portion 47 Substrate 48 Extension plate 49 Upper reinforcement plate 50 Lower reinforcement plate F Impact force

Claims (2)

Left and right rockers that are formed at the lower edge of the left and right side walls of the vehicle body and extend in the front-rear direction of the vehicle body, and the rear end portions of the rockers constituting the rear end portions of the respective rockers extend from the rear to the rear, and the front end portion is the rocker In the vehicle body lower structure having left and right rear side members coupled to the rear end,
In plan view of the car body, the width of the rear part of the front and rear parts of the rocker rear end part is increased inward toward the rear of the car body, and the rear part of the rocker rear end part is directed rearward. A vehicle body lower part structure for a vehicle, wherein a front opening portion of the rear side member is formed in a tapered shape and is inserted into the space and coupled to the rear end portion of the rocker.   The rear part of the rocker rear end part is branched to form left and right branch parts, the space is formed between the left and right branch parts, and the branch part on the outer side of the vehicle body among the left and right branch parts is It is positioned on a virtual extension line that goes to the rear of the front part of the rocker rear end part, and the cross section of each part in the longitudinal direction is formed to be substantially the same shape and size as the front part. 2. The vehicle body lower part structure according to claim 1, wherein the vehicle body extends from the front part of the rocker rear end part toward the rear and inward of the vehicle body.

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