JP5940831B2 - Car body rear structure - Google Patents

Description

  The present invention relates to a vehicle body rear structure in which a recess is formed in a vehicle body floor between left and right rear frames, and a tool can be stored in the recess.

In the rear structure of the vehicle body, a storage recess is usually provided at the rear of the floor panel, and a spare tire and tools can be stored in the storage recess.
By the way, it is known that a recess for storing a spare tire is formed of resin in the storage recess (see, for example, Patent Document 1).
By using the resin storage recess, the weight can be reduced as compared with the steel storage recess.

US Pat. No. 6,739,641

However, it is difficult to ensure the rigidity of the resin storage recess compared to the steel storage recess.
For this reason, when a heavy article such as an occupant rides on the resin storage recess, the storage recess may be deformed by the weight of the occupant riding on the storage recess, leaving room for improvement from this viewpoint. .

  An object of the present invention is to provide a vehicle body rear part structure that can be reduced in weight and can secure rigidity.

The invention according to claim 1 is a vehicle body rear structure in which a two-layer floor unit is provided in a vehicle body frame, and a recess can be formed in the vehicle body floor by the two-layer floor unit, wherein the two-layer floor unit has the recess A resin inner layer formed with a tool storage recess capable of storing a tool in the recess, and a resin outer layer capable of forming a space between the inner layer by covering the inner layer from the outside; A reinforcing storage protrusion that is capable of contacting the inner surface of the outer layer is provided at the bottom of the tool storage recess, and further includes an insert-molded nut formed on the outer layer. The under cover is attached to the outer layer .

  According to a second aspect of the present invention, a cross member constituting a part of the vehicle body frame extends in the vehicle width direction in front of the vehicle body of the two-layer floor unit, and a front end portion is provided on the cross member. And a tire support bracket that can support a spare tire by extending toward the rear of the vehicle body along the tire body, and the tire support bracket is inclined upwardly toward the front of the vehicle body so that the front portion of the spare tire is It has a tire guide part which can be guided toward the vehicle body front upper side, and a bulging part bulged toward the vehicle body front so as to confront the cross member.

Here, the body frame is provided with rear frames on the left and right sides of the two-layer floor unit. The left and right rear frames are configured to absorb the impact load by being deformed when a collision load is input from the rear of the vehicle body.
For this reason, it is not preferable that the deformation of the left and right rear frames is suppressed by the spare tire stored in the two-layer floor unit.
Accordingly, in claim 2, the tire support bracket is provided with a tire guide portion and a bulging portion, and the bulging portion is opposed to the cross member.

According to a third aspect of the present invention, the inner layer includes a tire support portion that supports a tire main body of the spare tire at a bottom portion of the concave portion.

According to a fourth aspect of the present invention, the tire support portion is provided with a reinforcing protrusion capable of contacting the inner surface of the outer layer.

In the invention which concerns on Claim 1, the two-layer floor unit was formed in two layers by the resin-made inner layer and the resin-made outer layer.
Thereby, a two-layer floor unit can be formed with resin, and a two-layer floor unit can be reduced in weight compared with a steel floor unit.

In addition, a two-layer floor unit was formed in two layers, an inner layer and an outer layer, and a space was formed between the inner layer and the outer layer. Further, a reinforcing storage protrusion is provided in the inner layer tool storage recess, and the reinforcing storage protrusion can be brought into contact with the inner surface of the outer layer.
By bringing the reinforcing storage protrusion into contact with the inner surface of the outer layer, the tool storage recess can be supported (reinforced) by the outer layer via the reinforcing storage protrusion.
Thus, by supporting the tool storage recess with the outer layer, the rigidity of the bottom of the inner layer (so-called surface rigidity) can be secured, and the rigidity of the two-layer floor unit can be increased.

Furthermore, since the tool storage recess can be formed into a shape corresponding to the tool shape, brackets and resin molding pads that have been necessary for supporting the conventional tool can be eliminated.
In addition, since a heavy tool is supported in the tool storage recess, the vibration of the inner layer can be reduced, and the interior of the vehicle interior becomes quiet.
Moreover, in the invention which concerns on Claim 1, the nut was insert-molded in the outer layer. As a result, the outer layer can be brought into close contact with the nut, and waterproofing between the nut and the outer layer can be ensured.
Further, by insert-molding the nut in the outer layer, a bracket that stably holds the nut in the outer layer can be eliminated.
As a result, the number of parts can be reduced, and the weight can be further reduced.

  In the invention according to claim 2, the tire support bracket is provided with the tire guide portion and the bulging portion, and the bulging portion is opposed to the cross member. By causing the bulging portion to face the cross member, the tire support bracket (that is, the tire guide portion) can be reinforced by the cross member.

Therefore, when an impact load is input to the spare tire from the rear of the vehicle body and the front portion of the spare tire hits the tire guide portion, deformation of the tire guide portion can be suppressed.
Accordingly, the front portion of the spare tire can be guided along the tire guide portion toward the upper front side of the vehicle body, and the rear portion of the spare tire can be moved forward of the vehicle body.
Therefore, the left and right rear frames of the two-layer floor unit can be deformed to suitably absorb the impact load.

In the invention which concerns on Claim 3 , the tire main part of the spare tire was supported by the tire support part by providing a tire support part in the bottom part of an inner layer (recessed part).
Thereby, since the tire support part can support the outer periphery vicinity (side surface) of a tire main body over substantially the whole region, a spare tire can be supported stably.

In the invention which concerns on Claim 4 , the protrusion for reinforcement was provided in the tire support part, and the protrusion was made possible to contact the inner surface of an outer layer.
Therefore, by bringing the reinforcing protrusion into contact with the inner surface of the outer layer, the reinforcing protrusion can be reinforced by the tire support portion, and the rigidity (so-called surface rigidity) of the tire support portion can be further increased.
As a result, the vicinity of the outer periphery (side surface) of the tire main body can be more favorably supported by the tire support portion over substantially the entire region, so that the spare tire can be supported more stably.

It is a perspective view which shows the vehicle body rear part structure of Example 1 which concerns on this invention. It is a disassembled perspective view which shows the vehicle body rear part structure of FIG. It is a top view which shows the vehicle body rear part structure of FIG. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. FIG. 4 is a plan view showing a state in which a puncture repair kit and a tool kit are removed from the rear body structure of FIG. 3. FIG. 6 is a sectional view taken along line 6-6 of FIG. FIG. 7 is a sectional view taken along line 7-7 in FIG. 3. It is a bottom view which shows the vehicle body rear part structure of FIG. It is a bottom view which shows the state which decomposed | disassembled the undercover from the vehicle body rear part structure of FIG. FIG. 10 is a sectional view taken along line 10-10 in FIG. 8. It is a figure explaining the example which shape | molds the two-layer floor unit of Example 1. FIG. It is a figure explaining the state which shape | molded the two-layer floor unit of Example 1. FIG. It is a perspective view which shows the vehicle body rear part structure of Example 2 which concerns on this invention. It is a top view which shows the vehicle body rear part structure of FIG. It is sectional drawing which shows the vehicle body rear part structure of FIG. FIG. 16 is a cross-sectional view showing the vehicle body rear part structure of FIG. 15 in an exploded state. It is a figure explaining the example which the impact load input into the vehicle body rear part structure of Example 2. FIG.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. Note that “front (Fr)”, “rear (Rr)”, “left (L)”, and “right (R)” follow the direction seen from the driver.

A vehicle body rear structure 10 according to the first embodiment will be described.
As shown in FIG. 1, the vehicle body rear structure 10 includes left and right rear frames 11 and 12 provided at predetermined intervals in the vehicle body width direction at the rear of the vehicle body, and front end portions 11 a and 12 a of the left and right rear frames 11 and 12. Cross member 14 spanned between, rear end cross member 16 spanned between rear end portions 11b, 12b of left and right rear frames 11, 12, and two layers provided on the vehicle body front side of rear end cross member 16 The floor unit 20 and an under cover 18 (see FIG. 8) provided at the left end of the two-layer floor unit 20 are provided.
A rear end panel 17 is provided below the rear end cross member 16.

As shown in FIG. 2, a vehicle body frame 25 is formed in a rectangular frame shape by the left and right rear frames 11, 12, the cross member 14, the rear end cross member 16, and the rear end panel 17.
The left and right rear frames 11 and 12 are provided at predetermined intervals in the vehicle body width direction at the rear of the vehicle body, and extend in the vehicle body front-rear direction.
The left and right rear frames 11 and 12 are configured to absorb an impact load by being deformed when a collision load is input from the rear of the vehicle body.
The cross member 14 extends across the left and right rear frames 11 and 12 by extending in the vehicle width direction in front of the vehicle body of the two-layer floor unit 20.

As shown in FIG. 13, the rear end cross member 16 extends toward the vehicle body width direction of the member main body 16 a (see also FIG. 3) at the rear of the two-layer floor unit 20, and the left leg portion 16 b has the left rear frame 11. The right leg 16c (see also FIG. 3) is provided on the right rear frame 12.
That is, the rear end cross member 16 is bridged between the left and right rear frames 11 and 12.
As shown in FIG. 2, the vehicle body frame 25 is formed in a substantially rectangular shape in plan view, and front and rear projecting pieces 26 and 27 and left and right projecting pieces 28 and 29 are formed on the inner periphery.

That is, the front projecting piece 26 is a projecting piece that projects from the cross member 14 toward the rear of the vehicle body. The rear projecting piece 27 is a projecting piece that projects from the lower end of the rear end panel 17 toward the front of the vehicle body (see FIG. 4).
Furthermore, the left and right projecting pieces 28 and 29 are projecting pieces that project from the left and right rear frames 11 and 12 toward the center in the vehicle width direction.

A unit storage space 31 in which the two-layer floor unit 20 can be stored is formed inside the front and rear projecting pieces 26 and 27 and the left and right projecting pieces 28 and 29.
A plurality of unit mounting holes 32 are formed in the front and rear projecting pieces 26 and 27 and the left and right projecting pieces 28 and 29.

The two-layer floor unit 20 is stored in the unit storage space 31 in a state where the protruding portions 23 of the two-layer floor unit 20 are placed on the front and rear projecting pieces 26 and 27 and the left and right projecting pieces 28 and 29. .
In this state, the bolts 34 are inserted into the plurality of mounting holes 24 formed in the overhang portion 23 and the plurality of unit mounting holes 32. The overhanging portion 23 of the two-layer floor unit 20 is attached to the front and rear overhanging pieces 26 and 27 and the left and right overhanging pieces 28 and 29 with the bolts 34 inserted.

  Further, the rear body structure 10 includes a floor panel 36 supported by the left and right rear frames 11, 12, a rear bulkhead 37 provided on the upper side of the floor panel 36, and a rear end provided at a lower portion of the rear end cross member 16. And a panel 17.

As shown in FIGS. 3 and 4, the two-layer floor unit 20 is a unit that can be housed in the vehicle body frame 25 and that can form a recess in the floor panel (vehicle body floor) 36.
The two-layer floor unit 20 includes a resin inner layer portion (inner layer) 21 in which an inner layer recess 41 is formed, and a resin outer layer portion (outer layer) 22 that covers the inner layer portion 21 from the outside.
A recess is formed in the floor panel 36 by the inner layer recess 41 of the inner layer portion 21.
A puncture repair kit 57 and a tool kit 61 are stored in the inner layer portion 21 of the two-layer floor unit 20.
The inner layer portion 21 and the outer layer portion 22 are integrally formed by blow molding.

  The inner layer portion 21 includes an inner layer concave portion 41 formed in a substantially circular shape in plan view, an inner layer overhang portion 42 projecting outward from the inner layer peripheral wall 76 of the inner layer concave portion 41, and a first layer formed in the inner layer concave portion 41. To sixth storage recesses (tool storage recesses) 43 to 48, first storage projections 51 and second storage projections 52 formed in the first and second storage recesses 43 and 44, and the inner layer recess 41 It has the 1st-3rd protrusion 53-55 formed.

As shown in FIGS. 4 and 5, the inner layer concave portion 41 is formed in a substantially circular shape in plan view, and stands along an inner layer bottom portion (bottom portion) 71 formed in a disk shape and an outer periphery 71 a of the inner layer bottom portion 71. And an inner layer peripheral wall 76 provided.
The inner layer recess 41 forms a recess in the floor panel 36.
The inner layer bottom portion 71 has an annular bottom portion 72 whose outer shape is formed in a substantially circular shape, and a central concave portion 73 provided so as to be recessed downward inside the annular bottom portion 72.
The central recessed portion 73 has a central bottom portion 74 provided substantially horizontally below the annular bottom portion 72.

  The inner layer projecting portion 42 is formed in a substantially rectangular frame shape by projecting from the upper end 76 a of the inner layer peripheral wall 76 toward the outside of the inner layer concave portion 41.

The first storage recess 43 is provided at a portion 74 a that is substantially at the center of the center bottom portion 74 and extends along the vehicle body center line 78.
The first storage recess 43 is formed in a substantially rectangular shape in plan view by extending in the longitudinal direction of the vehicle body, and is formed in a concave shape so as to be recessed downward in a substantially rectangular state.
The vehicle body center line 78 is a line extending in the vehicle body front-rear direction at the vehicle width direction center.

The second storage recess 44 is provided in a portion that is continuous with the rear portion 73 a of the central recess portion 73 and the rear portion 72 a of the annular bottom portion 72 and that extends along the vehicle body center line 78.
The second storage recess 44 is formed in a substantially square shape in plan view, and is formed in a concave shape so as to be recessed downward in a substantially square state.

A puncture repair kit 57 is stored in the first and second storage recesses 43 and 44.
The puncture repair kit 57 includes a gas filling can (tool) 58 that can be stored in the first storage recess 43, and a compressor (pump) (tool) 59 that can be stored in the second storage recess 44 (also in FIG. 3). reference).
This puncture repair kit 57 is a normal repair kit loaded on a general vehicle.

The third storage recess 45 is provided with a main portion in a portion 73 b of the center recess 73 that is closer to the left side in the vehicle width direction with respect to the vehicle body center line 78.
The third storage recess 45 is formed in a substantially rectangular shape in plan view so that the front and rear end portions 45a and 45b reach the annular bottom portion 72 by extending in the longitudinal direction of the vehicle body, and is recessed downward in a substantially rectangular state. It is formed in a concave shape.

The fourth storage recess 46 is provided in a portion 73 c on the right side in the vehicle width direction with respect to the vehicle body center line 78 in the center recess 73.
The fourth storage recess 46 is formed in a substantially rectangular shape in plan view by extending in the longitudinal direction of the vehicle body, and is formed in a concave shape so as to be recessed downward in a substantially rectangular state.

The fifth storage recess 47 is provided in a portion 72 b of the annular bottom portion 72 that is closer to the left side in the vehicle width direction than the third storage recess 45.
The fifth storage recess 47 extends in the front-rear direction of the vehicle body and is formed in a substantially L shape in plan view by extending from the front end portion 47a toward the right end 47b toward the inside in the vehicle width direction. It is formed in a concave shape so as to be recessed downward.

The sixth storage recess 48 is provided in a portion (corner) 76 b on the right side in the vehicle width direction with respect to the second storage recess 44 in the upper end 76 a of the inner peripheral wall 76.
The sixth storage recess 48 is formed so as to incline outward in the vehicle width direction toward the front of the vehicle body, thereby forming a substantially oblique straight line in plan view, and is formed in a concave shape so as to be recessed downward in a substantially oblique straight line state. ing.

As shown in FIG. 3, the tool kit 61 is stored in the third to sixth storage recesses 45 to 48.
The tool kit 61 can be stored in the jack main body (tool) 62 that can be stored in the third storage recess 45, the jack rotating shaft portion (tool) 63 that can be stored in the fourth storage recess 46, and the fifth storage recess 47. A jack handle (tool) 64 and a tow hook (tool) 65 that can be stored in the sixth storage recess 48 are provided.

As shown in FIGS. 4 and 5, a first storage protrusion (storage protrusion) 51 is provided on the bottom 43 a of the first storage recess 43.
The first storage protrusion 51 is formed in a substantially straight line shape in plan view in a state of extending in the vehicle width direction near the rear end of the bottom 43a and on the vehicle body center line 78.
The first storage protrusion 51 is a reinforcing protrusion protruding from the vicinity of the rear end of the bottom 43 a toward the inclined bottom (inner surface) 93 of the outer layer 22, and the lower end 51 a contacts (joins) the inclined bottom 93. )
Specifically, the lower end 51a of the first storage protrusion 51 is in contact (joined) with a portion 93a of the inclined bottom portion 93 at the center in the vehicle width direction and near the center in the vehicle longitudinal direction.

A second storage protrusion (storage protrusion) 52 is provided on the bottom 44 a of the second storage recess 44.
The second storage protrusion 52 is formed in a substantially X shape in plan view over substantially the entire area of the bottom 44a.
The second storage protrusion 52 is a reinforcing protrusion protruding from the bottom 44 a toward the inclined bottom portion 93 of the outer layer portion 22, and the lower end 52 a is in contact (joined) with the inclined bottom portion 93.
Specifically, the lower end 52a of the second storage projection 52 is in contact with (joined to) a portion 93b of the inclined bottom portion 93 at the center in the vehicle width direction and closer to the rear end in the vehicle longitudinal direction.

First to third protrusions (protrusions) 53 to 55 are provided on the annular bottom 72 of the inner layer recess 41.
The first protrusion 53 is formed in a substantially straight line shape in a plan view in a state of being extended in the vehicle width direction on the vehicle body center line 78 at the vehicle body front-rear direction substantially center of the front portion 72c of the annular bottom portion 72. Has been.
The first protrusion 53 is a reinforcing protrusion that protrudes from the front part 72 c of the annular bottom part 72 toward the front bottom part (inner surface) 91 of the outer layer part 22, and the lower end 53 a contacts (joins) the front bottom part 91. )

As shown in FIGS. 5 and 6, the second protrusion 54 extends in the radial direction at a portion 72 d on the right side in the vehicle width direction of the front portion 72 c of the annular bottom portion 72, and the front bottom portion 91 of the outer layer portion 22. It is the protrusion for reinforcement protruded toward.
The second protrusion 54 has a second abutting protrusion 54 a at the inner end of the second protrusion 54.
The second abutting protrusion 54 a protrudes in a substantially inverted truncated cone shape up to the front bottom 91, so that the lower end 54 b is in contact (joined) with the front bottom 91.

As shown in FIGS. 5 and 7, the third protrusion 55 extends in a radial direction to a portion 72 e on the right side in the vehicle width direction of the rear portion 72 a of the annular bottom portion 72, and is formed on the front bottom portion 91 of the outer layer portion 22. It is the protrusion for reinforcement projected toward the direction.
The third protrusion 55 has a third contact protrusion 55 a at the center of the third protrusion 55.
The third abutting protrusion 55 a protrudes in a substantially inverted truncated cone shape up to the front bottom portion 91, so that the lower end 55 b is in contact (joined) with the inclined bottom portion 93.

As shown in FIG. 4, the inner layer portion 21 is covered with the outer layer portion 22 from the outside (see also FIG. 2).
By covering the inner layer portion 21 from the outside with the outer layer portion 22, a space 81 is formed between the outer layer portion 22 and the inner layer portion 21.
The outer layer portion 22 includes an outer layer concave portion 83 that covers the inner layer concave portion 41 of the inner layer portion 21 from the outside, and an outer layer protruding portion 84 that projects outward from the outer layer peripheral wall 87 of the outer layer concave portion 83 (see FIG. 7).

The outer layer concave portion 83 includes an outer layer bottom portion 86 that covers the inner layer bottom portion 71 from the outside (below), and an outer layer peripheral wall 87 that stands up along the outer periphery of the outer layer bottom portion 86 and covers the inner layer peripheral wall 76 from the outside.
The outer layer bottom portion 86 has a front bottom portion 91 provided at the front portion, a front wall portion 92 provided at the rear end 91a of the front bottom portion 91, and an inclined bottom portion 93 provided at the lower end 92a of the front wall portion 92. .

The front bottom portion 91 is a bottom portion that projects horizontally from the lower end 87b of the front portion 87a toward the rear of the vehicle body in the outer peripheral wall 87.
The front wall portion 92 is a wall portion projecting downward from the rear end 91a of the front bottom portion 91.
The inclined bottom portion 93 is a bottom portion that is inclined upwardly from the lower end 92a of the front wall portion 92 to the lower end 87d of the rear portion 87c of the outer layer peripheral wall 87.

The outer layer projecting portion 84 projects from the upper end 87 e of the outer layer peripheral wall 87 toward the outside of the outer layer concave portion 83.
The outer layer overhanging portion 84 is formed in a substantially rectangular frame shape like the inner layer overhanging portion 42 below the inner layer overhanging portion 42.
The outer layer overhanging portion 84 and the inner layer overhanging portion 42 are joined to each other by blow-molding the two-layer floor unit 20 (the inner layer portion 21 and the outer layer portion 22).
As a result, the two-layer floor unit 20 is integrally formed, and a space 81 is formed between the outer layer portion 22 and the inner layer portion 21.

By joining the outer layer overhanging portion 84 and the inner layer overhanging portion 42, the outer layer overhanging portion 84 and the inner layer overhanging portion 42 form the overhanging portion 23 (see FIG. 7).
As shown in FIG. 2, a plurality of mounting holes 24 are formed in the overhang portion 23.
As described above, the overhanging portion 23 has the bolts 34 inserted into the plurality of mounting holes 24 and the plurality of unit mounting holes 32, and the front and rear overhanging pieces 26 and 27 and the left and right overhanging pieces are inserted by the inserted bolts 34. Fastened to 28, 29.

Here, as shown in FIG. 4, the outer layer bottom portion 86 of the outer layer portion 22 is provided with an inclined bottom portion 93 that is inclined upward toward the rear of the vehicle body, so that the front end 93c of the inclined bottom portion 93 is connected to the inner layer bottom portion 71 (annular bottom portion 72). Or the central recess 73).
Therefore, among the space 81 between the outer layer portion 22 and the inner layer portion 21, a large space height H between the inner layer bottom portion 71 and the inclined bottom portion 93 (outer layer bottom portion 86) can be secured.
Thereby, by using the space 81a between the inner layer bottom portion 71 and the inclined bottom portion 93, a space for forming the first to sixth storage recesses 43 to 48 in the inner layer portion 21 can be easily secured.

Furthermore, the rear end 93d of the inclined bottom portion 93 can be provided at a high position with respect to the road surface by providing the outer layer bottom portion 86 with the inclined bottom portion 93 having an upward slope.
Thereby, when the vehicle climbs an uphill road surface, it is possible to prevent the outer layer bottom portion 86 of the outer layer portion 22 from interfering with the road surface.

In addition, in a state where the two-layer floor unit 20 is integrally formed, the lower end 51a of the first storage projection 51 can be brought into contact (joined) with the portion 93a of the inclined bottom portion 93 that is closer to the center in the vehicle longitudinal direction.
In addition, the lower end 52 a of the second storage projection 52 can be brought into contact (joined) with a portion 93 b of the inclined bottom portion 93 near the rear end in the vehicle body front-rear direction.

Thereby, the 1st accommodation recessed part 43 can be supported by the inclination bottom part 93 (namely, outer layer part 22) via the 1st accommodation protrusion 51. FIG. In addition, the second storage recess 44 can be supported by the inclined bottom portion 93 (outer layer portion 22) via the second storage protrusion 52.
In this way, by supporting the first storage recess 43 and the second storage recess 44 with the outer layer portion 22, the rigidity (so-called surface rigidity) of the inner layer bottom portion 71 of the inner layer portion 21 can be secured, and the rigidity of the two-layer floor unit 20 can be increased. Can be increased.

Furthermore, in a state where the two-layer floor unit 20 is integrally molded, the lower end 53a of the first protrusion 53 can be brought into contact (joined) with the front bottom 91.
Furthermore, as shown in FIG. 6, the lower end 54 b of the second contact protrusion 54 a can be brought into contact (joined) with the front bottom portion 91. In addition, as shown in FIG. 7, the lower end 55 b of the third contact protrusion 55 a can be brought into contact (joined) with the inclined bottom portion 93.
Here, the first to third protrusions 53 to 55 are provided on the annular bottom portion 72.

Thereby, the annular bottom part 72 can be supported by the outer layer bottom part 86 (that is, the outer layer part 22) via the first to third protrusions 53 to 55.
As described above, by supporting the annular bottom portion 72 with the outer layer portion 22, the rigidity (so-called surface rigidity) of the inner layer bottom portion 71 of the inner layer portion 21 can be further ensured, and the rigidity of the two-layer floor unit 20 can be further increased. .

Moreover, since the 1st-6th accommodation recessed parts 43-48 can be shape | molded in the shape according to tool shapes, such as the jack main body 62, the bracket and resin molding pad which were conventionally required in order to support a tool can be abolished. .
In addition, since heavy tools such as the jack main body 62 are supported in the first to sixth storage recesses 43 to 48, the vibration of the inner layer portion 21 can be reduced, and the vehicle interior becomes quiet.

As shown in FIGS. 8 and 9, the under cover 18 is provided from below on the left end portion of the two-layer floor unit 20, specifically, the left end portion 86 a of the outer layer portion 22 (outer layer bottom portion 86).
The under cover 18 is a cover that protects the lower part of the rear part of the vehicle body, and is formed in a substantially pentagonal shape in plan view with the inner end 18a, the front end 18b, the outer end 18c, and the rear end 18d.

The inner end portion 18 a has a plurality of attachment holes 96 formed along the left end portion 86 a of the outer layer bottom portion 86.
Bolts 97 are inserted into the plurality of mounting holes 96, and the inserted bolts 97 are screwed to nuts 98 (see FIG. 10). Thereby, the inner end portion 18 a of the under cover 18 is fastened to the left end portion 86 a of the outer layer bottom portion 86.

The front end portion 18b of the under cover 18 is provided on the front end portion 36b of the left rear floor panel 36a by spot welding or the like.
An outer end portion 18c of the under cover 18 is provided on the outer end portion 36c of the left rear floor panel 36a by spot welding or the like.
The rear end 18d of the under cover 18 is provided on the rear projecting piece 27 of the rear end panel 17 and the rear end 36d of the left rear floor panel 36a by spot welding or the like.

As shown in FIG. 10, a plurality of nuts 98 to which the inner end portion 18 a of the under cover 18 is attached are insert-molded on the left end portion 86 a of the outer layer bottom portion 86.
A plurality of through holes 99 (see also FIG. 9) are formed in the inner end portion 18a of the under cover 18.
Bolts 97 are inserted into the through holes 99 and the mounting holes 96 of the left end portion 86 a, and the inserted bolts 97 are screwed to the nuts 98.
As a result, the inner end portion 18 a of the under cover 18 is attached to the left end portion 86 a of the outer layer bottom portion 86 from the outside by the bolt 97.

In this manner, by insert-molding the plurality of nuts 98 into the left end portion 86 a of the outer layer bottom portion 86, the left end portion 86 a of the outer layer bottom portion 86 can be brought into close contact with the nut 98.
Thereby, the waterproofness between the several nut 98 and the left end part 86a of the outer-layer bottom part 86 is securable.
Further, by insert-molding a plurality of nuts 98 on the left end portion 86a of the outer layer bottom portion 86, the bracket that was necessary to stably hold the plurality of nuts 98 on the left end portion 86a of the outer layer bottom portion 86 is unnecessary. it can.
As a result, the number of parts can be reduced, and the weight can be further reduced.

Next, an example of forming the two-layer floor unit 20 by blow molding will be described with reference to FIGS.
As shown in FIG. 11A, in a state where the first mold 101 and the second mold 102 are opened, a parison (tubular shape) is passed from the extruder 103 between the first mold 101 and the second mold 102. Molten resin) 104 is extruded as shown by arrow A.
After the parison 104 is pushed out as indicated by the arrow A, the first mold 101 and the second mold 102 are clamped.

As shown in FIG. 11B, the first mold 101 and the second mold 102 are clamped to sandwich the parison 104 between the first mold 101 and the second mold 102.
In this state, air pressure is applied to the inner wall 104a of the parison 104 as shown by an arrow B by blowing compressed air into the parison 104.

By applying air pressure to the inner wall 104 a of the parison 104, the parison 104 is pressed against the molding surfaces 101 a and 102 a of the first mold 101 and the second mold 102.
The parison 104 is molded by the molding surfaces 101 a and 102 a of the first mold 101 and the second mold 102.
Specifically, in the cylindrical parison 104, the outer layer portion 22 is formed at one portion 104b (see FIG. 11A) and the inner layer is formed at the other portion 104c (see FIG. 11A). Part 21 is formed.

At the same time, the overhang portion 23 is formed by integrally molding (bonding) the inner layer overhang portion 42 of the inner layer portion 21 to the outer layer overhang portion 84 of the outer layer portion 22.
Thus, the two-layer floor unit 20 can be integrally formed by blow-molding the outer layer portion 22 and the inner layer portion 21 with the same resin.

As shown in FIG. 12, the two-layer floor unit 20 in the first mold 101 and the second mold 102 is cooled and solidified.
After the two-layer floor unit 20 is solidified, the first mold 101 and the second mold 102 are opened, and the two-layer floor unit (molding) is formed between the opened first mold 101 and the second mold 102. Article) 20 is taken out.

Thus, the two-layer floor unit 20 can be molded from resin by blow-molding the two-layer floor unit 20 from the parison (tubular molten resin) 104.
Thereby, the two-layer floor unit 20 can be reduced in weight compared with a steel floor unit.

  Next, the vehicle body rear portion structure 110 according to the second embodiment will be described with reference to FIGS. In addition, in the vehicle body rear part structure 110 of Example 2, the same code | symbol is attached | subjected about the same similar member as the vehicle body rear part structure 10 of Example 1, and description is abbreviate | omitted.

A vehicle body rear structure 110 according to the second embodiment will be described.
As shown in FIGS. 13 and 14, the vehicle body rear structure 110 is configured such that the spare tire 121 can be stored in the two-layer floor unit 20 (inner layer recess 41) instead of the puncture repair kit 57 of the first embodiment. Other configurations are the same as those of the vehicle body rear structure 10 of the first embodiment.

The vehicle body rear structure 110 includes a tire support bracket 112 on the upper surface 41 a of the inner layer recess 41 that can accommodate the spare tire 121.
The tire support bracket 112 is disposed on the vehicle body center line 78 in plan view by extending in the vehicle front-rear direction along the upper surface 41a of the inner layer recess 41.
Specifically, the tire support bracket 112 extends in a belt shape from the cross member 14 to the rear end cross member 16 (rear end panel 17) toward the rear of the vehicle body.

As shown in FIGS. 15 and 16, the tire support bracket 112 includes a tire attachment portion 113 on which a spare tire 121 can be placed, a tire guide portion 114 provided at the front end 113 a of the tire attachment portion 113, and a tire guide portion. 114, and a front mounting portion (front end portion) 116 provided at a front end (upper end) 114a of the tire guide portion 114.
Further, the tire support bracket 112 includes a rear wall portion 117 provided at the rear end 113 b of the tire attachment portion 113 and a rear attachment portion 118 provided at the upper end 117 a of the rear wall portion 117.

The front mounting portion 116 is fastened to the upper portion 14a of the cross member 14 with a pair of bolts 34 (see FIG. 14 for the bolt 34 on the front side).
Further, the rear mounting portion 118 is fastened to the rear projecting piece 27 of the rear end panel 17 by a pair of bolts 34 (see FIG. 14 for the bolt 34 on the front side).

Here, the rear end panel 17 is provided below the rear end cross member 16. Therefore, the rear mounting portion 118 is provided on the rear end cross member 16 via the rear end panel 17.
Thus, by providing the front mounting portion 116 and the rear mounting portion 118, the vehicle body from the cross member 14 to the rear end cross member 16 with the tire support bracket 112 disposed on the vehicle body center line 78 (see FIG. 16). It extends towards the back.

  The tire attachment portion 113 is provided at the rim attachment portion 125 provided along the central recess 73, the front tire placement portion 127 provided at the front end 125a of the rim attachment portion 125, and the rear end 125b of the rim attachment portion 125. And a tire mounting portion 128.

The rim attachment portion 125 has a rim attachment bottom portion 126 formed in a flat shape so as to be placed on the central bottom portion 74 of the inner layer recess 41.
A mounting bracket 131 is provided at the center of the rim mounting bottom 126 in the longitudinal direction of the vehicle body, and a screw hole 131 a is formed in the mounting bracket 131.
The rim portion 122 of the spare tire 121 is fixed by screwing the screw portion 132a of the tire fixture 132 to the screw hole 131a of the mounting bracket 131.

Thereby, the spare tire 121 is attached to the tire support bracket 112.
In this state, the tire main body (that is, the tire rubber part) 123 of the spare tire 121 is placed (supported) on the front tire placing part 127 and the rear tire placing part 128.
The tire main body 123 is a part constituted by a rubber part of the tire.

The front tire mounting portion 127 is provided along the front concave portion 72 f of the annular bottom portion 72. Further, the rear tire mounting portion 128 is provided along the second storage recess 44.
The front tire mounting portion 127 and the rear tire mounting portion 128 are disposed flush with the annular bottom portion 72.
Therefore, the tire main body 123 is also mounted on the annular bottom portion 72 in a state where the tire main body 123 of the spare tire 121 is mounted on the front tire mounting portion 127 and the rear tire mounting portion 128.
That is, the annular bottom portion 72 serves as a tire support portion that supports the tire body 123. Hereinafter, the “annular bottom portion 72” will be described as the “tire support portion 72”.

In this way, by supporting the tire body 123 placed on the front tire placement portion 127 and the rear tire placement portion 128 with the tire support portion 72, the front and rear tire placement portions 127 and 128 and the tire support portion 72 of the tire body 123 are supported. The vicinity of the outer periphery (that is, the side surface) 123a can be supported over the entire area.
Thereby, the spare tire 121 accommodated in the two-layer floor unit 20 can be supported in a stable state.

Here, as shown in FIGS. 4 and 5, a reinforcing first protrusion 53 is provided in the front recess 72 f of the tire support 72, and the lower end 53 a of the first protrusion 53 is the front bottom 91 of the outer layer portion 22. Is contacted (joined).
Further, as shown in FIGS. 5 and 6, a reinforcing second protrusion 54 (second contact protrusion 54 a) is provided at a portion 72 d on the right side in the vehicle width direction of the front portion 72 c of the tire support portion 72. The lower end 54 b of the second abutting protrusion 54 a is in contact (joined) with the front bottom 91 of the outer layer portion 22.
Further, as shown in FIGS. 5 and 7, a reinforcing third protrusion 55 (third contact protrusion 55 a) is provided at a portion 72 e on the right side in the vehicle width direction of the rear portion 72 a of the tire support portion 72, The lower end 55 b of the third contact protrusion 55 a is in contact (joined) with the inclined bottom portion 93 of the outer layer portion 22.

Therefore, the tire support 72 can be reinforced by the first protrusion 53, the second contact protrusion 54a, and the third contact protrusion 55a for reinforcement, and the rigidity (so-called surface rigidity) of the tire support 72 is further increased. Can do.
As a result, the vicinity of the outer periphery (side surface) 123a of the tire main body 123 can be more favorably supported by the tire support portion 72 over substantially the entire region, so that the spare tire 121 can be supported more stably.

The tire guide portion 114 is formed so as to incline in an upward gradient from the front end 113a of the tire attachment portion 113 to the front attachment portion 116 toward the front of the vehicle body.
A bulging portion 115 is provided in the tire guide portion 114.
The bulging portion 115 bulges toward the front of the vehicle body so as to face the front portion 14 b of the cross member 14.

By causing the bulging portion 115 to face the front portion 14 b of the cross member 14, the tire support bracket 112 (that is, the tire guide portion 114) can be reinforced by the cross member 14.
Therefore, when the impact load is input to the spare tire 121 from the rear of the vehicle body and the front portion of the tire body 123 (the front portion of the spare tire 121) 123b hits the tire guide portion 114, deformation of the tire guide portion 114 is suppressed. Can do.

Thereby, the front part 123b of the tire main body 123 can be guided toward the vehicle body front upper side along the tire guide part 114, and the rear part 123c of the tire main body 123 can be moved ahead of the vehicle body.
Therefore, the left and right rear frames 11 and 12 provided on the left and right sides of the two-layer floor unit 20 can be suitably deformed to absorb the impact load.

  The rear wall 117 rises substantially vertically from the rear end 113b of the tire attachment portion 113 to the rear attachment portion 118 along the rear portion 76c of the inner peripheral wall 76.

Next, an example in which an impact load is input from the rear of the vehicle body to the rear end cross member 16 of the vehicle body rear structure 110 will be described with reference to FIG.
As shown in FIG. 17A, an impact load F1 is input to the rear end cross member 16 of the vehicle body rear structure 110 from the rear of the vehicle body.
When the impact load F1 is input to the rear end cross member 16, the impact load F2 is input to the spare tire 121 from the rear of the vehicle body, and the spare tire 121 moves as indicated by an arrow A toward the front of the vehicle body.
When the spare tire 121 moves toward the front of the vehicle body, the front portion 123b of the tire body 123 hits the tire guide portion 114.
Here, the bulging part 115 is opposed to the front part 14 b of the cross member 14, whereby the tire guide part 114 is reinforced by the cross member 14.

As shown in FIG. 17B, when the front portion 123b of the tire body 123 hits the tire guide portion 114, deformation of the tire guide portion 114 can be suppressed.
Therefore, the front portion 123b of the tire body 123 can be guided along the tire guide portion 114 toward the front upper side of the vehicle body as indicated by an arrow B.

As a result, the rear portion 123c of the tire body 123, that is, the spare tire 121 can be moved forward as indicated by the arrow C in the vehicle body. The two-layer floor unit can be deformed by moving the spare tire 121 forward of the vehicle body.
Therefore, together with the two-layer floor unit 20, the left and right rear frames 11, 12 (see FIG. 1) provided on the left and right sides of the two-layer floor unit 20 can be suitably deformed to absorb the impact load F1.

It should be noted that the vehicle body rear structure 10 according to the present invention is not limited to the above-described embodiment, and can be changed or improved as appropriate.
For example, the two-layer floor unit 20, the inner layer portion 21, the outer layer portion 22, the first to sixth storage recesses 43 to 48, the first and second storage protrusions 51 and 52, and the first to first embodiments shown in the above embodiment The shapes and configurations of the third protrusions 53 to 55, the tire support portion 72, the tire support bracket 112, the tire guide portion 114, the bulging portion 115, and the like are not limited to those illustrated, and can be appropriately changed.

  INDUSTRIAL APPLICABILITY The present invention is suitable for application to an automobile provided with a rear body structure in which a recess is provided in a vehicle body floor between the left and right rear frames and a vehicle body rear structure capable of storing a tool in the recess.

  DESCRIPTION OF SYMBOLS 10,110 ... Car body rear part structure, 14 ... Cross member, 20 ... Two-layer floor unit, 21 ... Inner layer part (inner layer), 22 ... Outer layer part (outer layer), 25 ... Body frame, 36 ... Floor panel (vehicle body floor), 41 ... Inner layer recess (recess), 41a ... Upper surface of inner layer recess, 43 to 48 ... First to sixth storage recesses (tool storage recess), 43a ... Bottom of first storage recess, 44a ... Bottom of second storage recess 51 ... 1st storage protrusion (storage protrusion), 52 ... 2nd storage protrusion (storage protrusion), 53-55 ... 1st-3rd protrusion (protrusion), 58 ... Gas filling can ( (Tool), 59 ... Compressor (Tool), 62 ... Jack body (Tool), 63 ... Jack rotating shaft (Tool), 64 ... Jack handle (Tool), 65 ... Towing hook (Tool), 71 ... Inner layer bottom (Bottom) ), 72 ... Tire support part, 81 ... Space, 91 ... Outer layer Of the outer layer portion, an inclined bottom portion (inner surface) of the outer layer portion, 98, a nut, 112, a tire support bracket, 114, a tire guide portion, 115, a bulging portion, 116, a front mounting portion (of the tire support bracket). Front end), 121 ... spare tire, 123 ... tire main body, 123b ... front of tire main body (front of spare tire).

Claims (4)

The vehicle body frame is provided with a two-layer floor unit, and a vehicle body rear structure capable of forming a recess in the vehicle body floor with the two-layer floor unit,
The two-layer floor unit is
A resin inner layer in which the recess is formed and a tool storage recess capable of storing a tool in the recess;
A resin outer layer capable of forming a space between the inner layer by covering the inner layer from the outside;
Reinforcing storage protrusions that can contact the inner surface of the outer layer are provided at the bottom of the tool storage recess,
Furthermore, a nut insert-molded in the outer layer,
An underbody structure for a vehicle body, wherein an under cover is attached to the outer layer from the outside of the outer layer using the nut . A cross member constituting a part of the vehicle body frame is extended toward the vehicle width direction in front of the vehicle body of the two-layer floor unit;
The cross member is provided with a front end portion, and includes a tire support bracket capable of supporting a spare tire by extending toward the rear of the vehicle body along the upper surface of the recess.
The tire support bracket is
A tire guide portion capable of guiding the front portion of the spare tire toward the front upper side of the vehicle body by inclining in an upward gradient toward the front of the vehicle body;
A bulging portion bulged toward the front of the vehicle body so as to face the cross member;
The vehicle body rear portion structure according to claim 1, comprising: The inner layer is
The vehicle body rear part structure according to claim 1 , further comprising a tire support portion that supports a tire main body of the spare tire at a bottom portion of the concave portion. The vehicle body rear part structure according to any one of claims 1 to 3 , wherein a reinforcing protrusion capable of contacting the inner surface of the outer layer is provided on the tire support portion.

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