JP3622658B2 - Car body rear structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle body rear structure in an automobile, particularly a back door type vehicle.
[0002]
[Prior art]
5 and 6 show the rear body structure of a conventional back door type vehicle. Reference numeral 1 denotes a roof panel, reference numeral 2 denotes a roof side rail extending in the longitudinal direction on the side of the roof panel, and the roof side rail inner 3A. A closed cross section is formed with the roof side rail outer 3B.
[0003]
Reference numeral 4 denotes a back pillar which is connected to the rear end of the roof side rail 2 and extends in the vertical direction of the vehicle body and constitutes a side edge of the back door opening 14, and is closed by the back pillar inner 5 and the body side outer 6. 7 is formed.
[0004]
The back pillar 4 includes a back pillar reinforcement 8 that is joined along the back pillar inner 5 within the closed cross section 7 and forms a second closed cross section 9 with the back pillar inner 5.
[0005]
Reference numeral 10 denotes a rear roof rail which is connected to the back pillar 4 and forms the upper edge of the back door opening 14 along the rear edge of the roof panel 1. The rear roof rail lower 11 and the rear roof rail upper 12 form a closed section 13. doing.
[0006]
A drip recess 15 extending in the longitudinal direction of the vehicle body is formed at a joint portion between the side edge of the roof panel 1, the roof side rail outer 3 </ b> B, and the body side outer 6. Flowing rain water, car wash water or the like is captured by the drip recess 15 to guide the drainage in the longitudinal direction of the vehicle body.
[0007]
Since the drip recess 15 is formed over the upper edge of the back pillar 4 as described above, the end portions of the back pillar reinforcement 8 and the rear roof rail upper 12 are divided at the portion where the drip recess 15 is formed. These two end portions are superposed together with the end portions of the roof panel 1 and the body side outer 6 as shown in FIG. 5 and are integrally joined by spot welding or the like (see Japanese Patent Laid-Open No. 11-124053).
[0008]
[Problems to be solved by the invention]
The end portion of the back pillar reinforcement 8 and the end portion of the rear roof rail upper 12 are divided at the gathering portion of the roof side rail 2, the back pillar 4, and the rear roof rail 10, and the second closed cross section 9 of the back pillar 4. The upper wall 9a and the upper wall 13a of the closed section 13 of the rear roof rail 10 are connected by the drip recess 15 as described above. The rear walls 9b and 13b of these closed sections 9 and 13 are shown in FIG. Since the closed cross sections 9 and 13 are discontinuous and thus discontinuous, it cannot be denied that the coupling rigidity of the aggregate portion is lowered.
[0009]
Therefore, the present invention provides a rear structure of a vehicle body that can increase the coupling rigidity of the upper corner portion of the back door opening in which the roof side rail, the back pillar, and the rear roof rail are assembled without using a dedicated reinforcing material with a simple structure. Is to provide.
[0010]
[Means for Solving the Problems]
In the invention of claim 1, a roof side rail having a closed cross section extending in the longitudinal direction of the vehicle body,
A back pillar with a closed cross-section connected to the rear end of the roof side rail and extending in the vertical direction of the vehicle body and constituting the side edge of the back door opening;
A roof panel formed with a drip recess extending in the longitudinal direction of the vehicle body at the junction between the roof side rail and the back pillar and the roof side edge,
A closed rear roof rail connected to the back pillar and forming the upper edge of the back door opening along the rear edge of the roof panel;
In a vehicle body rear structure comprising: a back pillar reinforcement that is joined along a back pillar inner in a closed cross section of the back pillar and forms a second closed cross section with the back pillar inner;
Forming a substantially horizontal first joint surface at each upper end portion of the back pillar inner and back pillar reinforcement at the upper corner portion of the back door opening where the roof side rail, the back pillar and the rear roof rail are gathered, The first joint surfaces are overlapped and joined to the lower surface of the drip recess, and a substantially perpendicular second joint surface is formed continuously from the rear end of the first joint surfaces, The rear side wall of the rear roof rail is overlapped and joined , and a third joint surface that is inclined obliquely downward continuously to the lower end of the second joint surface of the back pillar reinforcement is formed. And the rear end wall of the back pillar joined across the rear end of the body side outer and the back end of the back pillar inner and the rear end of the body side outer. The back pillar rear end wall and the rear end side edge connected to the drip recess of the roof panel are fitted to the first, second, and third joint surfaces of the back pillar reinforcement. Each of the fitting surfaces is formed, and the fitting surfaces are overlapped and joined to the first, second, and third joining surfaces .
[0011]
In the invention of claim 2, a vertical wall that rises almost vertically upward is formed at the upper end of the back pillar inner of claim 1, and a first joint surface is bent at the upper edge of the vertical wall. In addition, the second joint surface is bent at the rear edge of the vertical wall continuously to the first joint surface.
[0013]
In the invention of claim 3 , the rear end portion of the back pillar reinforcement according to claim 1 or 2 is formed as an inclined surface inclined obliquely downward, and one side portion of the inclined surface is third joined. It is characterized by its surface.
[0014]
【The invention's effect】
According to the first aspect of the present invention, the upper ends of the back pillar inner and the back pillar reinforcement are superposed and joined to the lower surface of the drip recess at the first horizontal joining surface, respectively, and the substantially vertical first Since it is overlapped and joined to the rear side wall of the rear roof rail at the two joint surfaces, the back pillar inner and the back pillar reinforcement are combined with the continuous second closed cross section of the back pillar and the closed cross section of the rear roof rail. And the rear roof rail have a multi-wall structure, and the first joint surface and the second joint surface are continuous, so that the joint strength of the joint portion can be increased, and the back door opening The coupling rigidity of the upper corner can be further increased.
In addition, since the fitting surface of the back end wall of the back pillar and the fitting surface of the roof panel are overlapped and joined to the first, second, and third joining surfaces of the back pillar reinforcement, the rear roof rail In addition, it is possible to enhance the dispersion effect of the load acting around each axis of the roof side rail and the back pillar .
[0015]
According to the invention described in claim 2, in addition to the effect of the invention of claim 1, the vertical wall provided at the upper end portion of the back pillar inner includes the second closed section of the back pillar and the closed section of the rear roof rail. Therefore, the rigidity of the portion where the closed cross-section is provided can be increased.
[0017]
According to the invention described in claim 3 , in addition to the effect of the invention of claim 1 or 2 , the rear end portion where the third joint surface of the back pillar reinforcement is formed is formed as an inclined surface as a whole. Therefore, the moldability is improved, and the stress concentration effect at the rear end portion can be eliminated to further enhance the load dispersion effect.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0019]
1 to 3, reference numeral 31 denotes a roof panel, 32 denotes a roof side rail extending in the longitudinal direction of the vehicle body at the side of the roof panel, and the roof side rail inner 33 and the roof side rail outer 34 form a closed section 35. ing.
[0020]
Reference numeral 36 denotes a back pillar that is connected to the rear part of the roof side rail 32 and extends in the vertical direction of the vehicle body, and constitutes a side edge of the back door opening 60. The back pillar inner 37, the body side outer 38, and the back door rear end The wall 39 forms a closed section 40.
[0021]
In the present embodiment, the back pillar inner 37 and the roof side rail inner 33 are formed integrally, and the roof side rail outer 34 is formed integrally with the body side outer 38.
[0022]
The back pillar 36 includes a back pillar reinforcement 41 which is joined along the upper end portion of the back pillar inner 37 within the closed cross section 40 and forms a second closed cross section 42 with the back pillar inner 37. Yes.
[0023]
In the present embodiment, the back pillar reinforcement 41 is extended forward to the middle of the roof side rail 32.
[0024]
A rear roof rail 43 is connected to the back pillar 36 and forms the upper edge of the back door opening 60 along the rear edge of the roof panel 1. The rear roof rail lower 44 and the rear roof rail upper 45 form a closed section 46. doing.
[0025]
A trifurcated brace 47 that is joined across the roof side rail inner 33 and the back pillar inner 37 is joined to the end of the rear roof rail lower 44 in the vehicle width direction.
[0026]
A drip recess 48 extending in the longitudinal direction of the vehicle body is formed at a joint portion between the side edge of the roof panel 31 and the roof side rail outer 34 and the body side outer 38. Flowing rain water, car wash water, and the like are captured by the drip recess 48 to guide the drainage in the longitudinal direction of the vehicle body.
[0027]
Substantially horizontal first joint surfaces 49 and 51 are formed at the upper ends of the back pillar inner 37 and the back pillar reinforcement 41, respectively, and these first joint surfaces 49 and 51 are formed on the lower surface of the drip recess 48, respectively. In addition, the rear roof rail upper 45 is superposed together with the end portion in the vehicle width direction and integrally joined by arc welding, laser welding or the like.
[0028]
The first joint surfaces 49 and 51 are formed over the roof side rail inner 33, and even on the roof side rail 32, the first joint surfaces 49 and 51 are superposed on the lower surface of the drip recess 48 and joined. Is done.
[0029]
Further, second joining surfaces 50 and 52 which are substantially perpendicular to the rear ends of the first joining surfaces 49 and 51 are formed, respectively, and the second joining surfaces 50 and 52 and the rear side wall of the rear roof rail 43 are formed. That is, the rear side wall 45c of the rear roof rail upper 45 is overlapped and joined.
[0030]
A vertical wall 54 that rises substantially vertically is formed over the roof side rail inner 33 at the upper end portion of the back pillar inner 37, and the first joint surface 49 is bent at the upper edge of the vertical wall 54. At the same time, the second joint surface 50 is continuously bent to the first joint surface 49 at the rear edge of the vertical wall 54.
[0031]
On the other hand, a third joint surface 53 that is inclined obliquely downward is formed continuously from the lower end of the second joint surface 52 of the back pillar reinforcement 41.
[0032]
The rear end wall 39 of the back pillar overlaps and joins the side edge flange 39a on the outer side in the vehicle width direction to the rear edge flange 38a of the body side outer 38, and also connects the upper edge flange 39b continuous to the side edge flange 39a. The upper side edge of the back pillar rear end wall 39 is overlapped and joined to the upper edge of the body side outer 38, and the side edge flange 39c on the inner side in the vehicle width is joined to the rear edge of the back pillar inner 37. A fitting surface 55 that fits the first, second, and third joint surfaces 51, 52, and 53 of the back pillar reinforcement 41 is formed in the portion.
[0033]
The rear roof rail upper 45 has its front edge flange 45a overlapped and joined to the front edge flange 44a of the rear roof rail lower 44, and the rear edge flange 45b overlapped and joined to the surface of the rear roof rail lower 44, and The brace 47 is overlapped and joined to the upper edge portion of the back pillar inner 37 and the roof side rail inner 33, and the rear edge flange 44b of the rear roof rail lower 44 and the side edge flange 39c on the inner side in the vehicle width direction of the back pillar rear end wall 39 are combined. Are connected to each other.
[0034]
On the other hand, the roof panel 31 is joined by overlapping the rear edge flange 31a with the rear edge flange 44b of the rear roof rail lower 44, and the rear end side edge of the roof panel 31 connected to the drip concave portion 48 is A fitting surface 56 that overlaps with the fitting surface 55 of the back pillar rear end wall 39 is formed, and these fitting surfaces 55, 56 are connected to the first, second, and third joining surfaces 51 of the back pillar reinforcement 41. , 52 and 53 are polymerized and joined.
[0035]
According to the structure of the above embodiment, the upper ends of the back pillar inner 37 and the back pillar reinforcement 41 are overlapped and joined to the lower surface of the drip recess 48 at the first horizontal joining surfaces 49 and 51, respectively. The second closed cross-section 42 of the back pillar 36 and the closed cross-section 46 of the rear roof rail 43 are continuous because the second vertical joining surfaces 50 and 52 are overlapped and joined to the rear side wall 45c of the rear roof rail 43. In addition to this, the joining portion of the back pillar inner 37 and the back pillar reinforcement 41 and the rear roof rail 43 has a multi-wall structure, and each of the first joining surfaces 49 and 51 and the second joining surfaces 50 and 52 includes Since it is continuous, the joint strength of the joint part can be increased, and the coupling rigidity of the upper corner portion of the back door opening can be further enhanced.
[0036]
In addition, a vertical wall 54 provided at the upper end of the back pillar inner 37 is vertically interposed between the second closed cross-section 42 of the back pillar 36 and the closed cross-section 46 of the rear roof rail 43 as a vertical rib. Since it functions, the rigidity of the portion where the closed cross-sections 42 and 46 are connected can be increased.
[0037]
Further, the fitting surface 55 of the back pillar rear end wall 39 and the fitting surface 56 of the roof panel 31 are formed with respect to the first, second, and third joining surfaces 51, 52, 53 of the back pillar reinforcement 41. Since they are superposed and joined, it is possible to enhance the dispersion effect of loads acting around the respective axes of the rear roof rail 43, the roof side rail 32, and the back pillar 36.
[0038]
FIG. 4 shows a second embodiment of the present invention. In this embodiment, the rear end portion of the back pillar reinforcement 41 in the first embodiment is formed as an inclined surface 57 inclined obliquely downward. One side portion of the inclined surface 57 serves as a third joint surface 53 that superposes and joins the back pillar rear end wall 39 and the fitting surfaces 55 and 56 of the roof panel 31.
[0039]
Therefore, according to the second embodiment, in addition to the effects of the first embodiment, the rear end portion where the third joint surface 53 of the back pillar reinforcement 41 is formed is formed as the inclined surface 57 as a whole. Therefore, the moldability is improved and the concentration of stress at the rear end portion is eliminated, and the effect of dispersing the load acting around each axis of the rear roof rail 43, the roof side rail 32, and the back pillar 36 can be enhanced.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a first embodiment of the present invention.
2 is a perspective view showing a state in which a roof panel, a body side outer, a rear roof rail upper, and a back pillar inner in FIG. 1 are disassembled. FIG.
FIG. 3 is a schematic cross-sectional explanatory view taken along the line AA in FIG. 1;
4 is an exploded perspective view similar to FIG. 2, showing a second embodiment of the present invention. FIG.
FIG. 5 is an explanatory cross-sectional view showing a main part of a conventional structure.
FIG. 6 is a perspective view showing a conventional structure.
[Explanation of symbols]
31 Roof Panel 32 Roof Side Rail 35 Roof Side Rail Closed Section 36 Back Pillar 37 Back Pillar Inner 38 Body Side Outer 39 Back Pillar Rear End Wall 40 Back Pillar Closed Section 41 Back Pillar Reinforce 42 Second Closed Section 43 Rear Roof rail 45c Rear roof rail rear side wall 46 Closed section 48 Drip recess 49 Back pillar inner first joint surface 50 Back pillar inner second joint surface 51 Back pillar reinforce first joint surface 52 Back pillar reinforce second joint Surface 53 Third joining surface 54 of the back pillar reinforcement 54 Vertical wall 55 Fitting surface 56 of the rear end wall of the back pillar Fitting surface 57 of the roof panel Inclined surface

Claims (3)

A roof side rail with a closed cross section extending in the longitudinal direction of the vehicle body,
A back pillar with a closed cross-section connected to the rear end of the roof side rail and extending in the vertical direction of the vehicle body and constituting the side edge of the back door opening;
A roof panel formed with a drip recess extending in the longitudinal direction of the vehicle body at the junction between the roof side rail and the back pillar and the roof side edge,
A closed rear roof rail connected to the back pillar and forming the upper edge of the back door opening along the rear edge of the roof panel;
In a vehicle body rear structure comprising: a back pillar reinforcement that is joined along a back pillar inner in a closed cross section of the back pillar and forms a second closed cross section with the back pillar inner;
Forming a substantially horizontal first joint surface at each upper end portion of the back pillar inner and back pillar reinforcement at the upper corner portion of the back door opening where the roof side rail, the back pillar and the rear roof rail are gathered, The first joint surfaces are overlapped and joined to the lower surface of the drip recess, and a substantially perpendicular second joint surface is formed continuously from the rear end of the first joint surfaces, The rear side wall of the rear roof rail is overlapped and joined , and a third joint surface that is inclined obliquely downward continuously to the lower end of the second joint surface of the back pillar reinforcement is formed. And the rear end wall of the back pillar joined across the rear end of the body side outer and the back end of the back pillar inner and the rear end of the body side outer. The back pillar rear end wall and the rear end side edge connected to the drip recess of the roof panel are fitted to the first, second, and third joint surfaces of the back pillar reinforcement. A vehicle body rear structure, characterized in that fitting surfaces are formed, and these fitting surfaces are joined to the first, second, and third joining surfaces by superposition . A vertical wall that rises substantially vertically upward is formed at the upper end of the back pillar inner, the first joint surface is bent at the upper edge of the vertical wall, and the rear edge of the vertical wall is continuous with the first joint surface. The vehicle body rear part structure according to claim 1, wherein the second joint surface is bent. Formed as an inclined surface inclined to the rear end of the back pillar reinforcement obliquely downward, the motor vehicle according to claim 1 or 2, characterized in that the one side of the inclined surface and the third joint surface Car body rear structure.

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