JP4420407B2 - Car body rear structure - Google Patents

Description

  The present invention relates to a rear body structure of an automobile in which an inclined portion in the middle of a rear frame is raised with an upward slope toward the rear of the vehicle body and a seat is provided on the rear side of the inclined portion.

The rear structure of an automobile body is formed in a substantially U-shaped cross section with the left and right rear frames opened upward, and the floor panel is placed on the upper sides of the left and right rear frames, thereby closing the opening with the floor panel and the rear floor. Form.
In the rear structure of the vehicle body, in order to extend the rear axle for the rear wheels in the vehicle width direction, the left and right rear frames are raised upwards toward the rear of the vehicle body, and reinforcement reinforcements (stiffeners) in the left and right rear frames (For example, refer to Patent Document 1).
Utility Model Registration No. 2586651

  In this vehicle body rear structure, the left and right rear frames are formed with the same width from the front end to the rear end, and reinforcement reinforcements (stiffeners) are provided in the left and right rear frames to increase the rigidity and strength of the left and right rear frames. It is configured to ensure.

Here, some vehicle body rear structures are provided with seats behind the left and right raised portions. The occupant seated on this seat puts his / her feet on the rear floor near the raised portion.
However, since the rear frame of Patent Document 1 is formed with the same width from the front end to the rear end, it is difficult to secure the foot space of the occupant seated on the seat.

  An object of the present invention is to provide a rear structure of a vehicle body that can secure rigidity and strength and can ensure a sufficient foot space for an occupant.

According to the first aspect of the present invention, the left and right rear frames are formed in a substantially U-shaped cross section that opens upward at the inner and outer frame side walls and the frame bottom wall, respectively, and the middle inclined portion of each rear frame faces the rear of the vehicle body. launched in up slope Te, the rear floor panel provided on each rear frame, the rear vehicle body structure provided with a sheet on the inclined portion rear side of the rear floor panel, toward Cow upward portion from the inclined portion lower portion As the width dimension between the inner and outer frame side walls is gradually narrowed , stiffeners are provided along the interior in the longitudinal direction of the vehicle body. The stiffeners are formed on the inner and outer stiffener side walls and the stiffener bottom wall. Rutotomoni is U-shaped cross section that opens upward, the stepped portion forming the ridge over the rear end portion is formed from a front end portion in the stiffener bottom wall, the inner With stiffener sidewall of is bonded to the frame side walls of the inner and outer, arranged stiffener and the distance between the stiffener bottom wall and the frame bottom wall gradually decreases toward the upper portion from the lower portion of the inclined portion It is characterized by that.

The invention according to claim 2 is characterized in that the rear frame is divided into front and rear parts, and the divided front and rear parts are joined in a state of being overlapped at the part formed in the narrow width.

The invention according to claim 3 is characterized in that the rear frame is provided with a bulkhead inside the narrow portion.
5. The invention according to claim 4, wherein a support bracket that supports the rear floor panel is joined to an inner frame side wall of the inclined portion, and the support bracket extends horizontally toward the rear of the vehicle body, and the horizontal support bracket. And an inclined support bracket raised substantially vertically from the rear end portion, and the stiffener is provided substantially horizontally with respect to the horizontal support bracket.

  In the invention according to claim 1, the inclined portion is gradually narrowed from the lower portion toward the upper portion. Thereby, there exists an advantage that the foot space of the passenger | crew who seated on the seat can be expanded.

Furthermore, the stiffener was arranged so as to gradually reduce the distance between the stiffener bottom wall and the bottom wall toward the rear of the vehicle body. Therefore, the stiffener can be brought closer to a substantially horizontal direction.
As a result, when a forward impact force acts on the rear frame rear end portion, the impact force acting on the rear frame rear end portion can be received by the stiffener.
Therefore, there is an advantage that the inclined portion can be more reliably prevented from being deformed by an impact force.

Moreover, in the invention which concerns on Claim 1 , the level | step-difference part was provided in the stiffener bottom wall from the front-end part to the rear-end part. By providing a step portion in the longitudinal direction of the vehicle body, a ridge line (that is, a corner portion) can be formed.
Thereby, there exists an advantage that the rigidity and intensity | strength with respect to the front-back direction of a stiffener can be improved further.

In the invention according to claim 2 , the rear frame is divided into front and rear portions, and the divided front and rear portions are overlapped and joined at a portion formed with a narrow width.
By dividing the narrow portion, there is an advantage that a narrow rear frame can be easily formed using, for example, a high-tensile steel plate that is relatively difficult to press-form.
In addition, by using a high-tensile steel plate, it is possible to reduce the plate thickness dimension, and there is an advantage that the weight of the rear frame can be reduced.

In the invention which concerns on Claim 3 , the bulkhead was provided in the location formed narrowly. As a result, when a forward impact force acts on the rear end of the rear frame, it becomes possible to keep the cross-sectional shape of the rear frame with the bulkhead, and the impact force acting on the rear end of the rear frame is received by the rear frame. There is an advantage that you can.
In the invention which concerns on Claim 4, the stiffener was provided so that it might become substantially horizontal with respect to a horizontal support bracket.
Thereby, it becomes possible to support a support bracket with a stiffener, and there exists an advantage that the rigidity and intensity | strength of an inclination part can be raised further.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. “Front”, “back”, “left”, and “right” indicate Fr as the front side, Rr as the rear side, L as the left side, and R as the right side according to the direction viewed from the operator.
FIG. 1 is an exploded perspective view showing a rear body structure of an automobile according to the present invention.
The rear body structure 10 of the automobile has a rear frame structure 11 formed in a frame shape, and a rear half frame part 13 is formed by forming an inclined part (step part) 12 at a substantially center of the rear frame structure 11 in the longitudinal direction of the vehicle body. The rear floor panel 16 is attached to the rear frame structure 11 at a position higher than the front half frame portion 14.

The rear frame structure 11 has a fuel tank 18 attached to the lower portion of the front half frame portion 14.
The rear floor panel 16 has a floor step portion 23 formed substantially at the center so that the rear half floor panel 21 is disposed at a position higher than the front half floor panel 22.

The rear half floor panel 21 is attached to the rear half frame portion 13, and the front half floor panel 22 is attached to the front half frame portion 14.
Further, the floor step portion 23 is attached to the inclined portion 12.
A seat 25 is attached to the rear half floor panel 21 behind the floor step portion 23, that is, the rear side of the inclined portion 12.

FIG. 2 is a perspective view showing a rear frame structure according to the present invention, and FIG. 3 is a sectional view showing a rear body structure of an automobile according to the present invention.
The rear frame structure 11 is provided with left and right side sills 27 and 28 on both sides of the vehicle body in the longitudinal direction of the vehicle body, and a left rear frame (rear frame) 31 extends from the left side sill 27 toward the rear of the vehicle body. The right rear frame (rear frame) 32 extends rearward from the vehicle body, the left and right rear frames 31, 32 are covered with left and right upper stiffeners (side covers) 35, 36, respectively, and the left and right side sills 27, 28 are front cross members. 38 is bridged in the vehicle width direction, and a rear cross member 39 is bridged in the vehicle width direction on the rear end portions 31a, 32a of the left and right rear frames 31, 32, thereby forming a substantially rectangular frame. ing.
Further, the rear frame structure 11 is constructed by bridging first to third central cross members 41, 42, 43 at predetermined intervals in the center of the left and right rear frames 31, 32.

As shown in FIG. 3, spot welding is performed with the right side 16 b (see also FIG. 1) of the rear floor panel 16 sandwiched between the right rear frame 32 and the right upper stiffener 36.
Similarly, spot welding is performed with the left side 16a of the rear floor panel 16 being sandwiched between the left rear frame 31 and the left upper stiffener 35 (see FIGS. 8, 9, and 10).
As a result, the rear floor panel 16 is attached to the rear frame structure 11, and the rear floor 45 is formed by the rear floor panel 16 and the left and right upper stiffeners 35 and 36.

Here, the left and right upper stiffeners 35 and 36 are set to have a plate thickness larger than that of the rear floor panel 16.
By using the left and right upper stiffeners 35 and 36 having a plate thickness larger than that of the rear floor panel 16, the left and right upper stiffeners 35 and 36 are provided with a frame material for the left and right rear frames 31 and 32, Doubles as

By dividing the members constituting the rear floor 45 into the rear floor panel 16 and the left and right upper stiffeners 35 and 36, the thickness of the left and right upper stiffeners 35 and 36 can be reduced with the thickness of the rear floor panel 16 being suppressed. Can be bigger.
As a result, handling of the rear floor panel 16 is facilitated, manufacturing can be facilitated, and an increase in the weight of the vehicle body can be suppressed.

  The left and right rear frames 31, 32 and the left and right upper stiffeners 35, 36 are symmetrical members. Therefore, the same reference numerals are given to the constituent members of the left and right rear frames 31, 32 and the left and right upper stiffeners 35, 36, the left members 31, 35 will be described, and the description of the right members 32, 36 will be omitted.

FIG. 4 is a perspective view showing a state in which the left rear frame and the left upper stiffener according to the present invention are disassembled, and FIG. 5 is an exploded perspective view showing the left rear frame according to the present invention.
The left rear frame 31 is formed in a substantially U-shaped cross section having an opening 51 on the upper and lower side walls 47, 48 and the bottom wall 49, and a frame inclined portion (inclined portion) 52 in the middle of the left rear frame 31 is a vehicle body. It is raised from the lower part 53 to the upper part 54 with an upward slope toward the rear.

  By raising the frame inclined portion 52 at substantially the center of the left rear frame 31 toward the rear of the vehicle body with an upward slope, a step is formed at the approximate center of the left rear frame 31 so that the frame rear half 55 is higher than the frame front half 56. Placed in position.

The frame inclined portion 52 is formed so that the width dimension W gradually becomes narrower from the lower portion 53 toward the upper portion 54, and a middle stiffener (stiffener) 58 extends along the inside of the left rear frame 31. A bulkhead 61 is provided in a narrow portion 59 (hereinafter referred to as a “narrow portion 59”) provided in the direction.
The frame inclined portion 52 is located in the vicinity of the feet of the passenger seated on the seat. Therefore, by forming the frame inclined portion 52 so that the width dimension W gradually becomes narrower from the lower portion 53 toward the upper portion 54, the foot space of the occupant seated on the seat 25 can be expanded. .

As shown in FIG. 5, the left rear frame 31 is divided into a front frame part (front part) 63, a central frame part (rear part) 64, and a rear frame part 65.
The front frame portion 63 is a portion extending from the frame front half 56 to the front end portion 55 a of the frame rear half 55 through the frame inclined portion 52.
A support bracket 67 is welded to the inner wall 47 b of the frame inclined portion 52.
As shown in FIG. 5, the support bracket 67 is formed in a substantially square shape by a horizontal support bracket 67a and an inclined support bracket 67b.

The center frame portion 64 is a portion extending from the rear end portion 52 a of the frame inclined portion 52 to the center 55 b of the frame rear half 55.
The front frame part 63 and the central frame part 64 are joined in a state where the rear end part 63a and the front end part 64a are overlapped with a narrow part 59, respectively.

By dividing the narrow portion 59 into the front frame portion 63 and the central frame portion 64, for example, a narrow rear frame can be easily formed using a high-strength steel plate that is relatively difficult to press form.
In addition, by using a high-tensile steel plate, it is possible to reduce the thickness of the plate, and the rear frame can be reduced in weight.

A raised portion 71 extending in the longitudinal direction of the vehicle body is formed at the front end portion 64a of the central frame portion 64, that is, at a portion corresponding to the narrow portion 59.
The bulkhead 61 is disposed so as to cross the approximate center of the raised portion 71.

The rear frame portion 65 is a portion extending from the center 55 b of the frame rear half 55 to the rear end portion 55 c of the frame rear half 55.
The central frame part 64 and the rear frame part 65 are coupled in a state where they are overlapped at the rear end part 64b and the front end part 65a, respectively.

By dividing the central frame portion 64 and the rear frame portion 65, the rear frame portion 65 can be formed of a material capable of absorbing shock.
Specifically, when a forward impact force acts on the rear end portion of the rear frame portion 65, the rear frame portion 65 can be deformed (crushed) well to absorb the impact force.

The middle stiffener 58 is formed in a U-shaped cross-section that opens upward at the inner and outer stiffener side walls 73 and 74 and the stiffener bottom wall 75.
The inner stiffener side wall 73 is joined to the inner side wall 47 of the left rear frame 31, and the outer stiffener side wall 74 is joined to the outer side wall 48 of the left rear frame 31.

FIG. 6 is a cross-sectional view showing the left rear frame according to the present invention.
The middle stiffener 58 includes a stiffener horizontal portion 81 extending along the frame front half 56 and a stiffener inclined portion 82 extending along the frame inclined portion 52.
In the stiffener horizontal portion 81, a stiffener bottom wall 75 is provided substantially parallel to the bottom wall 49a of the frame front half 56 with a predetermined distance D1.
The stiffener inclined portion 82 is provided such that the predetermined distance D1 gradually decreases from the lower portion 53 toward the upper portion 54 with respect to the bottom wall 49b of the frame inclined portion 52.

  Therefore, the middle stiffener 58 can be brought close to a substantially horizontal direction. Thus, for example, when a forward impact force is applied to the rear end portion 31a (see FIG. 2) of the left rear frame 31, the middle stiffener 58 provides a good impact force applied to the rear end portion 31a of the left rear frame 31. Can receive.

The middle stiffener 58 is provided with a stiffener stepped portion (stepped portion) 58c on the stiffener bottom wall 75 from the front end portion 58a to the rear end portion 58b (see also FIGS. 5 and 8).
By providing the stepped portion 58c in the longitudinal direction of the vehicle body, the ridgelines (that is, corner portions) 58d and 58e shown in FIG. 5 can be formed.
As a result, the rigidity and strength of the middle stiffener 58 in the front-rear direction can be increased.

FIG. 7 is a perspective view showing a left rear frame according to the present invention.
A bulkhead 61 is provided inside a narrow portion 59 of the left rear frame 31.
Therefore, when a forward impact force acts on the rear end portion of the left rear frame 31, the bulkhead 61 can keep the cross-sectional shape of the left rear frame 31 so as not to be deformed.
Thereby, the left rear frame 31 can receive an impact force applied to the rear end portion of the left rear frame 31.

The front frame part 63 and the central frame part 64 are coupled in a state where the rear end part 63a and the front end part 64a are overlapped with a narrow part 59, respectively.
In this way, by overlapping the rear end portion 63a and the front end portion 64a with the narrow portion 59, the rigidity and strength of the narrow portion 59 can be ensured.

FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 2 and shows a state where the rear floor panel 16 is attached to the frame front half 56 of the left rear frame 31. FIG.
The front half 56 of the frame is a substantially U-shaped member having an opening 51 on the inner and outer side walls 47a and 48a and the bottom wall 49a, and is bent inward at the upper end of the inner wall 47a toward the vehicle body center side. A side 84 is provided, and an outer bent side 85 that is bent outward from the vehicle body is provided at the upper end of the outer wall 48a.
The outer side wall 48 a and the outer bent side 85 are welded to the left side sill 27.

A left upper stiffener 35 is put on the upper part of the front half 56 of the frame.
Specifically, the outer side 35 a of the left upper stiffener 35 is spot welded to the outer bent side 85.
The left side 16a of the rear floor panel 16 is sandwiched between the inner bent side 84 and the inner side 35b of the left upper stiffener 35. In this state, the inner bent side 84, the inner side 35b, and the left side 16a are spot welded. Has been.
Thereby, the opening 51 of the frame front half 56 is covered with the left upper stiffener 35.

9 is a cross-sectional view taken along line 9-9 of FIG. 2, and shows a state in which the rear floor panel 16 is attached to the frame inclined portion 52 of the left rear frame 31. FIG.
The frame inclined portion 52 is a member having a substantially U-shaped cross section provided with an opening 51 above the inner and outer side walls 47b and 48b and the bottom wall 49b.
A support bracket 67 is joined to the surface of the inner wall 47b (the surface facing the vehicle body center side) by spot welding.

As shown in FIG. 5, the support bracket 67 is formed in a substantially square shape with a horizontal support bracket 67a and an inclined support bracket 67b.
The support bracket 67 has an attachment portion 87 joined to the center of the surface of the inner wall 47b and a support portion 88 extending from the lower end portion of the attachment portion 87 toward the center of the vehicle body so as to face the left upper stiffener 35. Is provided.
The support bracket 67 is formed in a substantially L shape by a mounting portion 87 and a support portion 88.

The support portion 88 is disposed below the upper edge 47c of the inner wall 47b by an H dimension.
The support 88 extends horizontally from the inner bent side 84 (see FIGS. 5 and 8) in the horizontal support bracket 67a toward the rear of the vehicle body, and is raised substantially vertically in the inclined support bracket 67b. .

Further, as described above, the middle stiffener 58 is provided in the frame inclined portion 52.
Specifically, the inner and outer side walls of the middle stiffener 58 are joined to the inner and outer side walls 47b and 48b of the frame inclined portion 52 by spot welding.
The middle stiffener 58 is provided such that the stiffener bottom wall 75 is positioned substantially horizontally with the support portion 88 of the support bracket 67.

A left upper stiffener 35 is placed on top of the frame inclined portion 52.
The left upper stiffener 35 includes a horizontal portion 91 located above the opening 51, a vertical portion 92 extending downward from the inner side 91a of the horizontal portion 91, and a lower end portion 92a of the vertical portion 92 toward the vehicle body center. A projecting portion 93 projecting horizontally.
The overhang portion 93 is located above the support portion 88.

The outer side 91b of the horizontal part 91 is joined to the upper end part 48c of the outer wall 48b via the wheel house mounting member 95 by spot welding.
Further, the support portion 88, the overhang portion 93, and the left side 16 a are spot welded in a state where the left side 16 a of the rear floor panel 16 is sandwiched between the support portion 88 and the overhang portion 93.

  That is, the left upper stiffener 35 covers the opening 51 by covering the upper portion 52b of the frame inclined portion 52 with the horizontal portion 91, and joins the outer side 91b of the horizontal portion 91 to the upper end portion 48c of the outer wall 48b. The inner wall 47 b is covered with a vertical portion 92 extending downward from the inner side 91 a of the 91, and the left side 16 a of the rear floor panel 16 is sandwiched between the projecting portion 93 and the support portion 88.

The wheel house mounting member 95 is a member for joining to a wheel house (not shown) for the rear wheel.
By joining the frame inclined portion 52 to a wheel house (not shown), the rigidity and strength of the frame inclined portion 52 are ensured.

As described above, the support portion 88 is disposed below the upper edge 47c of the inner wall 47b by an H dimension, and the overhang portion 93 is extended from the lower end portion 92a of the vertical portion 92. The left side 16 a of the rear floor panel 16 is joined to the rear panel 16.
Therefore, the rear floor panel 16 can be recessed downward in the vicinity of the frame inclined portion 52, and the intersection angle portion of the vertical portion 92 and the rear floor panel 16 (that is, the lower end portion of the vertical portion 92) 92a. The bending radius dimension can be reduced.
As a result, the floor space of the occupant seated on the seat 25 (see FIG. 1) can be increased along with the lower floor of the rear floor 45.

Further, the horizontal portion 91 of the left upper stiffener 35 is placed on the upper portion 52b of the frame inclined portion 52, and the outer side 91b of the horizontal portion 91 is joined to the upper end portion 48c of the outer wall 48b.
The inner wall 47 b is covered with the vertical portion 92 of the left upper stiffener 35, and the overhang portion 93 projects substantially horizontally from the lower end portion 92 a of the vertical portion 92.

On the other hand, the support portion 88 of the support bracket 67 is extended from the inner wall 47 b to the lower side of the overhang portion 93. Then, the left side 16 a of the rear floor panel 16 is joined between the protruding support portion 88 and the protruding portion 93.
In this way, the outer side 91b of the horizontal portion 91 is joined to the upper end portion 48c of the outer wall 48b, and the overhanging portion 93 is joined to the support portion 88, thereby ensuring the rigidity and strength of the frame inclined portion 52. Can do.

Further, the left side 16 a of the rear floor panel 16 can be held between the projecting portion 93 of the left upper stiffener 35 and the support portion 88 of the support bracket 67.
Thereby, the rear floor panel 16 can be firmly joined to the overhang portion 93 and the support portion 88, and the joining strength can be increased.

Further, the middle stiffener 58 is provided at a horizontal position with respect to the support bracket 67.
Accordingly, the support bracket 67 can be supported by the middle stiffener 58, and the rigidity and strength of the frame inclined portion 52 can be further increased.

By the way, the vertical portion 92 of the left upper stiffener 35 is set with a clearance D3 at a constant interval with respect to the inner wall 47b of the frame inclined portion 52.
In this way, by setting the clearance D3 between the inner wall 47b of the frame inclined portion 52 and the vertical portion 92 of the left upper stiffener 35, it becomes possible to absorb manufacturing tolerances of the frame inclined portion 52, and manufacture. Can be facilitated.

10 is a cross-sectional view taken along line 10-10 of FIG. 2, and shows a state where the rear floor panel 16 is attached to the frame rear half 55 of the left rear frame 31. FIG.
The front frame portion 63 and the central frame portion 64 are coupled in a state where they are overlapped at the rear end portion 63a and the front end portion 64a, respectively.
A bulkhead 61 is provided inside the front end portion 64 a of the central frame portion 64.

The rear end portion 63a of the front frame portion 63 is a substantially U-shaped member having an opening 51 on the inner and outer side walls 63b and 63c and the bottom wall 63d. A bent inner side 98 is provided.
A raised portion 63e (see also FIG. 5) extending in the longitudinal direction of the vehicle body is formed on the bottom wall 63d.

The front end portion 64a of the central frame portion 64 is a member having a substantially U-shaped cross section provided with an opening 51 above the inner and outer side walls 64c and 64d and the bottom wall 64e.
A raised portion 71 (see also FIG. 5) extending in the longitudinal direction of the vehicle body is formed on the bottom wall 64e.

The left upper stiffener 35 is covered on the upper portion of the portion where the rear end portion 63a of the front frame portion 63 and the front end portion 64a of the central frame portion 64 are overlapped.
Specifically, the outer side 35a of the left upper stiffener 35 is spot welded to the upper end 64f of the front end 64a of the central frame portion 64.

Further, the left side 16a of the rear floor panel 16 is sandwiched between the inner bent side 98 and the inner side 35b of the left upper stiffener 35. In this state, the inner bent side 98, the inner side 35b and the left side 16a are spotted. Welded.
Thereby, the opening 51 of the frame rear half 55 is covered with the left upper stiffener 35.

FIG. 11 is a view for explaining an example in which a forward impact force acts on the rear end portion of the left rear frame according to the present invention.
When a forward impact force F1 is applied to the rear end portion 31a (see FIG. 2) of the left rear frame 31, a part F2 of the applied impact force F1 is transmitted to the stiffener inclined portion 82 of the middle stiffener 58 as indicated by an arrow.

The stiffener inclined portion 82, that is, the middle stiffener 58 is arranged in a state of being close to a substantially horizontal direction.
Therefore, the impact force F2 transmitted to the stiffener inclined portion 82 can be satisfactorily received by the middle stiffener 58.
Thereby, it can prevent that the flame | frame inclination part 52 deform | transforms with the impact force F1.

In addition, since the stiffener step portion 58c is provided on the stiffener bottom wall 75 of the middle stiffener 58, the rigidity and strength of the middle stiffener 58 in the front-rear direction can be increased.
Thereby, it can prevent still more favorably that the frame inclination part 52 deform | transforms with the impact force F1.

FIGS. 12A and 12B are views for explaining the foot space of the occupant in the vehicle body rear structure according to the present invention. In FIG. 12, the right part is shown for easy understanding.
As shown to (a), in the horizontal support bracket 67a, the support part 88 is extended horizontally toward the vehicle body rear side from the inner side bent side 84, and is substantially upright in the inclination support bracket 67b ( (See also FIG. 3).

And the support part 88 is arrange | positioned below from the upper edge 47c of the inner wall 47b in the horizontal support bracket 67a, as shown in FIG.
Therefore, in the vicinity of the frame inclined portion 52, the rear floor panel 16 can be recessed below the surface 52c of the frame inclined portion 52.

As shown in (b), a wheel house or the like is covered with a side lining 101, a floor mat 102 is attached to the rear floor 45 (see FIG. 9), and a seat 25 is provided on the rear side of the frame inclined portion 52.
As described in (a), since the rear floor panel 16 is recessed downward in the vicinity of the frame inclined portion 52, the foot space 105 of the occupant seated on the seat 25 can be enlarged.

  Further, as described in FIGS. 4 and 5, the frame inclined portion 52 is formed so that the width dimension W gradually becomes narrower from the lower portion 53 toward the upper portion 54, so that the seat 25 is seated on the seat 25. It is possible to further expand the foot space 105 of the occupant.

  Note that the shapes of the left and right upper stiffeners 35, 36, the middle stiffener 58, the bulkhead 61, and the like exemplified in the above embodiment can be changed as appropriate.

  INDUSTRIAL APPLICABILITY The present invention is suitable for application to a vehicle body rear structure in which an inclined portion in the middle of a rear frame is raised upward toward the rear of the vehicle body and a seat is provided on the rear side of the inclined portion.

It is a disassembled perspective view which shows the vehicle body rear part structure of the motor vehicle based on this invention. It is a perspective view which shows the rear frame structure which concerns on this invention. It is sectional drawing which shows the vehicle body rear part structure of the motor vehicle based on this invention. It is a perspective view which shows the state which decomposed | disassembled the left rear frame and left upper stiffener which concern on this invention. It is a disassembled perspective view which shows the left rear frame which concerns on this invention. It is sectional drawing which shows the left rear frame which concerns on this invention. It is a perspective view which shows the left rear frame which concerns on this invention. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 2. FIG. 9 is a sectional view taken along line 9-9 in FIG. 2. FIG. 10 is a cross-sectional view taken along line 10-10 of FIG. It is a figure explaining the example in which the front impact force acted on the rear-end part of the left rear frame which concerns on this invention. It is a figure explaining the passenger | crew's foot space in the vehicle body rear part structure which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Car body rear structure, 16 ... Rear floor panel, 25 ... Seat, 31 ... Left rear frame (rear frame), 32 ... Right rear frame (rear frame), 35 ... Left upper stiffener (side cover), 36 ... Right Upper stiffener (side cover), 45 ... rear floor, 47, 47b ... inner wall (inner frame side wall) , 48, 48b ... outer wall (outer frame side wall) , 49, 49b ... bottom wall (frame bottom wall) , 51 ... opening , 52 ... Frame inclined part (inclined part), 53 ... Lower part, 54 ... Upper part, 58 ... Middle stiffener (stiffener), 58c ... Stiffener step part (step part) , 58d, 58e ... Ridge line , 59 ... Fine site of the width (portion formed narrow), 61 ... bulkhead, 63 ... front frame portion (front portion), 64 ... central frame portion (rear portion), 67 ... For example brackets, 67a ... horizontal support bracket 67b ... tilt support bracket, 73 ... inner stiffener sidewall, 74 ... outer stiffener sidewall, 75 ... stiffener bottom wall, D1 ... distance between the stiffener bottom wall and the bottom wall, W ... width.

Claims (4)

The left and right rear frames are formed in a substantially U-shaped cross section that opens upward at the inner and outer frame side walls and the frame bottom wall, respectively, and the inclined portions in the middle of each rear frame are raised upwardly toward the rear of the vehicle body, In the rear structure of a vehicle body provided with a rear floor panel in the rear frame and a seat on the rear side of the inclined portion of the rear floor panel,
Wherein with the width dimension between the inner and outer frame side wall as the inclined portions buy toward the lower portion to the upper portion is gradually formed into narrow, stiffener is provided toward the vehicle longitudinal direction along the inside,
The stiffener is formed in a U-shaped cross section that opens upward and out of stiffener sidewall and stiffener bottom wall Rutotomoni, the step portion forming the ridge over the rear end portion is formed from a front end portion in the stiffener bottom wall ,
The stiffener side wall is joined to the inner and outer frame side walls, and the stiffener is adjusted so that the gap between the stiffener bottom wall and the frame bottom wall gradually decreases from the lower part to the upper part of the inclined portion. A vehicle body rear structure characterized by being arranged. The rear frame is divided into portions of the front and rear, divided body of an automobile according to claim 1 Symbol placement site before and after is equal to or coupled to a superimposed state at a point formed in the narrow Rear structure. 3. The rear body structure of an automobile according to claim 1, wherein the rear frame is provided with a bulkhead inside the narrow portion. A support bracket for supporting the rear floor panel is joined to the inner frame side wall of the inclined portion,
The support bracket is
A horizontal support bracket extending horizontally toward the rear of the vehicle body, and an inclined support bracket raised substantially vertically from the rear end of the horizontal support bracket;
The vehicle body rear part structure according to any one of claims 1 to 3 , wherein the stiffener is provided so as to be substantially horizontal with respect to the horizontal support bracket .

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