JP5983101B2 - Rear body structure of the vehicle - Google Patents

Description

  The present invention relates to a rear body structure of a vehicle provided with a wheel house gusset, and more particularly to a rear body structure of a vehicle in which a reinforcing member is bonded to a wheel house gusset, a wheel house, and a rear side frame.

  2. Description of the Related Art Conventionally, a vehicle suspension is provided with a damper device for attenuating vibrations and shocks during traveling in order to ensure occupant handling stability. The damper device is disposed so as to incline in the vehicle width direction as it extends upward, and its upper end is supported by a damper support portion of a suspension housing formed in the upper portion of the wheel house. Therefore, since a load corresponding to a component force directed inward in the vehicle width direction of the damper load input in the vertical direction with respect to the suspension housing acts on the vehicle body, a phenomenon in which the vicinity of the suspension housing falls down in the vehicle width direction due to this load, There was a so-called internal fall problem.

  The rear body structure of the vehicle disclosed in Patent Document 1 includes an upper rain (damper support portion reinforcement) that forms a closed cross-section that bulges from the upper part to the lower part of the rear wheel house toward the vehicle compartment, and The lower wheel house includes a lower array that is disposed below and connects the upper rain and the floor panel, and an upper cross member that forms a closed cross-section and connects the left and right lower arrays in cooperation with the floor panel. A connecting gusset for connecting the gate opening is provided. Thereby, the closed cross section extended along the upper surface of a rear wheel house and a floor panel is comprised, the rigidity of a vehicle body rear part is improved, and the torsional rigidity of the whole vehicle body rear part is improved.

  The rear vehicle body structure of the vehicle disclosed in Patent Document 2 includes a first gusset that connects the vicinity of the damper mounting portion at the upper part of the wheel house and the rear pillar in a substantially vertical direction, the vicinity of the suspension support portion, and the vicinity of the damper mounting portion at the upper portion of the wheel house. A second gusset that is connected in the vertical direction; a joint portion between the cross member and the rear side frame; and a third gusset that connects the lower part of the quarter pillar in the substantially vertical direction along the side wall of the wheel house. The closed cross section constituted by the third gusset and the wheel house and the closed cross section of the quarter pillar are made continuous. Thereby, the vibration of the wheel house is suppressed and the inward collapse in the vicinity of the damper mounting portion is suppressed.

JP 2006-0669265 A JP 2011-168121 A

As described above, the load acting on the vehicle body from the damper support portion is transmitted to the connecting portion between the lower part of the wheel house and the rear side frame, and the load concentrated on this connecting portion is caused by inclining in the vicinity of the suspension housing and vibration of the vehicle body. Is the main factor.
In the rear body structure of the vehicle disclosed in Patent Documents 1 and 2, a closed cross section that is continuous in the vertical direction is provided so that a lower array and a gusset are provided in the vicinity of the suspension housing and a part of the connection between the lower part of the wheel house and the rear side frame is included in part. Due to the construction, the vehicle body rigidity can be increased structurally, and the inward tilt and the vehicle body vibration can be suppressed. However, in order to achieve such an effect, it is necessary to provide a sufficient cross-sectional rigidity so that the closed cross section formed in the connection portion can actually withstand the load acting on the vicinity of the suspension housing. It is necessary to increase the section modulus of the closed section included in a part thereof.

  In general, when increasing the section modulus of a closed section, a method of increasing the sectional area of the closed section by forming a large gusset or the like, a method of filling the inside of the closed section, a reinforcement that partitions the inside of the closed section (node member) ) Is known. However, although use of these methods for increasing the section modulus can achieve suppression of inward tilting and improvement of torsional rigidity, there is a risk of introducing new problems in terms of vehicle body weight and productivity as described below.

When the section modulus is increased by increasing the size of the gusset, etc., the gusset protrudes toward the passenger compartment, reducing the passenger compartment space, increasing the weight of the vehicle, and increasing the manufacturing cost associated with the increase in size of the parts. . When the section modulus is increased by a filler such as urethane foam, the filler is sealed inside the closed section, so that a reduction in vehicle interior space can be avoided. However, when a filler is used, the filler spreads outside the target area during foaming, and it is difficult to control the filling area, so that the expected reinforcing effect may not be obtained. In addition, the weight of the vehicle body increases due to the filler, and the manufacturing cost may increase due to an increase in material costs and production processes.
When the section modulus is increased by the node member, problems remain in terms of the weight of the vehicle body and the manufacturing cost as in the case of filling the inside of the closed section. In particular, since the node member is joined by spot welding to a vehicle body member that forms a closed cross section such as a wheel house or a gusset, a spot gun is installed at the connection portion between the lower part of the wheel house and the rear side frame. It is difficult to secure a space for placement and a work space.

  An object of the present invention is to provide a rear vehicle body structure that can achieve both vehicle body rigidity and productivity in the vicinity of a suspension housing without increasing the vehicle body weight.

The rear vehicle body structure of the vehicle according to claim 1 includes a pair of left and right wheel houses that bulge from the side wall of the vehicle body to the vehicle interior side and includes a damper support portion for a suspension member at an upper portion, and lower portions of the left and right pair of wheel houses. A vehicle body rear structure including a pair of left and right rear side frames that are connected to each other and extend in the front-rear direction, and a pair of left and right wheel house gussets that connect the vicinity of the damper support portion and the rear side frame on the vehicle interior side. The rear side frame includes a stepped portion that protrudes upward from an inner portion in the vehicle width direction, and the wheel house gusset cooperates with the wheel house and the rear side frame to be substantially L-shaped in front view. A closed section is formed, and the wheel house gusset, the wheel house, and the rear side frame are adhesively bonded inside the closed section. And the reinforcing member is provided, wherein the reinforcing member has a honeycomb structure substantially formed into the same shape as the closed cross section, for adhesive bonding of the honeycomb structure and at least the wheel house gusset wheel house and the rear side frames And a step-shaped portion that is bonded to the upper surface of the stepped portion on the honeycomb structure .

  In this vehicle rear body structure, the wheel house gusset cooperates with the wheel house and the rear side frame to form a substantially L-shaped closed cross section when viewed from the front. A connecting section between the lower part of the house and the rear side frame can be formed with a closed section that is continuous in the vertical direction including the connecting part as a part, and the rigidity of the vehicle body can be increased.

  The invention of claim 2 is the invention of claim 1, comprising a cross member member that connects the pair of left and right rear side frames and whose left and right ends are respectively connected to the lower part of a pair of left and right wheel house gussets, The reinforcing member is bonded to the cross member member.

According to a third aspect of the present invention, in the first or second aspect of the invention, in the honeycomb structure, at least one of a front surface portion and a rear surface portion is adhesively bonded to the wheel house gusset by the adhesive. It is characterized by having .

According to the first aspect of the present invention, the reinforcing member bonded and bonded to the closed cross-section constituent member is provided inside the closed cross-section constituted by the wheel house gusset, the wheel house, and the rear side frame. In addition, without filling the inside of the closed cross section with the filler, the cross section modulus of the closed cross section can be increased, and sufficient cross section rigidity can be ensured. Moreover, since the spot welding process of the reinforcing member can be omitted by adhesive bonding, it is not necessary to secure a spot gun arrangement space and work space, and the production efficiency can be increased.
This makes it possible to achieve both vehicle body rigidity and productivity in the vicinity of the suspension housing without increasing the vehicle body weight.
Further, the weight of the reinforcing member can be reduced to further suppress the increase in the weight of the vehicle body.
Furthermore, since the height position of the inner part in the vehicle width direction can be lowered while increasing the section modulus of the rear side frame, both the vehicle body rigidity and the vertical space for the rear seat occupant can be ensured.

According to the second aspect of the present invention, since the reinforcing member is adhesively bonded to the cross member member, the load acting on the vehicle body from one damper support portion can be efficiently distributed via the cross member member. Since the support rigidity by the member can be further increased, the section modulus of the closed section can be further increased .

According to invention of Claim 3 , a honeycomb structure can be efficiently joined with respect to a vehicle body using the surface part which contributes to cross-sectional rigidity improvement .

1 is a perspective view of a rear body structure of a vehicle according to an embodiment of the present invention. It is a side view of a rear body structure. It is a principal part top view of a rear body structure. It is the IV-IV sectional view taken on the line of FIG. It is the VV sectional view taken on the line of FIG. It is the VI-VI sectional view taken on the line of FIG. It is the VII-VII sectional view taken on the line of FIG. It is a principal part expansion perspective view when a front side gusset is removed. (A) is a perspective view of a honeycomb structure, (b) is a side view of the honeycomb structure, (c) is a plan view of the honeycomb structure, and (d) is a cross-sectional view taken along line IX-IX in (b). (A) is a perspective view of a honeycomb structure according to Modification 1, (b) is a side view of the honeycomb structure, (c) is a plan view of the honeycomb structure, and (d) is an XX line of (b). It is sectional drawing. (A) is a perspective view of a honeycomb structure according to Modification 2, (b) is a side view of the honeycomb structure, (c) is a plan view of the honeycomb structure, and (d) is an XI-XI line of (b). It is sectional drawing. It is a graph which shows the comparison result which concerns on vehicle body torsional rigidity. It is a graph which shows the comparison result which concerns on suspension support rigidity.

  Hereinafter, modes for carrying out the present invention will be described based on examples. In this embodiment, the front-rear direction is defined as the front-rear direction and the left-right direction is defined as the left-right direction with respect to the traveling direction of the vehicle.

Embodiment 1 of the present invention will be described below with reference to FIGS.
As shown in FIGS. 1-8, the vehicle V of a present Example is a 4-door type hatchback vehicle provided with the lift gate (not shown) in the rear part. The vehicle V includes a floor panel 1, a pair of left and right side panels 2, a pair of left and right rear side frames 3, a pair of left and right rear suspensions 4, a pair of left and right rear wheel houses 5, and a pair of left and right sides. The reinforcing member 30 is provided.

As shown in FIGS. 1, 3 to 5, the floor panel 1 is provided between a pair of left and right rear side frames 3 and extends in the longitudinal direction of the vehicle body.
The floor panel 1 has a rear-up and inclined kick-up portion 1a formed in the middle in the front-rear direction, and a rear seat pan for installing a pair of left and right rear seats (not shown) in front of the kick-up portion 1a. 1b and a rear floor 1c for forming a luggage compartment on the rear side of the kick-up portion 1a are provided.

As shown in FIGS. 1 and 3 to 8, a cross member 6 extending in the vehicle width direction is provided between the pair of left and right rear side frames 3 at the top of the kick-up portion 1 a. The cross member 6 includes a lower member member 7 having a substantially hat-shaped cross section and an upper member member 8 (cross member member) having a substantially hat-shaped cross section. The lower member member 7 and the upper member member 8 are floor panels. 1 is constituted by two upper and lower closed sections extending in the vehicle width direction joined with 1 interposed therebetween.
The lower member member 7 is fixed to the lower portion of the kick-up portion 1a and forms a closed cross section extending in the vehicle width direction in cooperation with the lower portion of the kick-up portion 1a.

The upper member member 8 includes a front wall portion 8a, a rear wall portion 8b, a substantially horizontal upper wall portion 8c connected to upper ends of the front wall portion 8a and the rear wall portion 8b, and left and right ends of the upper wall portion 8c. And a pair of left and right rectangular openings 8d formed in the section. The upper member 8 is fixed to the upper portion of the kick-up portion 1a and forms a closed cross section extending in the vehicle width direction in cooperation with the upper portion of the kick-up portion 1a.
The front wall portion 8a and the rear wall portion 8b are extended to a position corresponding to the outer end portion of the rear side frame 3 in the vehicle width direction. The outer end in the vehicle width direction of the upper wall portion 8c, that is, the inner end in the vehicle width direction of the so-called opening 8d is provided at a position corresponding to the inner end in the vehicle width direction of the rear side frame 3.

As shown in FIGS. 1 and 2, the pair of left and right side panels 2 includes a side panel outer (not shown) that forms the outer wall of the vehicle body, a side panel inner 2a (vehicle body side wall) that forms the vehicle interior wall, A roof rail portion 2b that forms the upper end of the panel 2, a front entrance / exit (not shown) through which a front seat occupant can get on / off, a rear entrance / exit 2c through which a rear seat occupant can get on / off, and a rear quarter window glass are mounted. A quarter window opening 2d is provided.
The side panel inner 2a is formed with a rear wheel house 5 that bulges from the portion corresponding to the top of the kick-up portion 1a to the vehicle interior side over the rear portion.

As shown in FIGS. 1 to 8, the pair of left and right rear side frames 3 includes an upper frame 10 and a lower frame 11 having a substantially hat-shaped cross section, and both the frames 10 and 11 cooperate in the front-rear direction. It constitutes an extended closed section.
The upper frame 10 is integrally formed with an upper wall portion 10a extending in the front-rear direction at an inner portion in the vehicle width direction and a step portion 10b extending in the vehicle width direction outer portion of the upper wall portion 10a and extending in the front-rear direction. The step portion 10b is provided so as to protrude upward so that its height position is higher than that of the upper wall portion 10a.

  A joint flange portion for connecting the step portion 10b in the vehicle width direction outer portion and the lower frame 11 in the vehicle width direction outer portion is provided so as to rise vertically, and a wheel house inner is provided on the joint flange portion. The lower end portion of 5a is spot-joined. The lower end of the front wall portion 8a and the rear wall portion 8b of the upper member member 8 is spot-bonded to the upper surface of the step portion 10b via a flange portion. A joint flange portion for connecting both of the upper wall portion 10a in the vehicle width direction and a lower frame 11 in the vehicle width direction inner portion is provided horizontally, and the vehicle of the floor panel 1 is connected to the joint flange portion. The end in the width direction is spot-joined. Therefore, the floor panel 1 and the upper wall portion 10a are connected in a substantially flush manner to form the indoor floor portion of the vehicle V.

  As shown in FIG. 1, the pair of left and right rear suspensions 4 includes a lower arm (not shown), a damper device 4a, a coil spring (not shown), etc., and a pair of left and right rear side frames 3 and a pair of these. It is connected to a subframe (not shown) supported by the rear side frame 3. Since the rear suspension 4 has a known structure, detailed description thereof is omitted.

Next, the pair of left and right rear wheel houses 5 will be described.
Since the pair of rear wheel houses 5 have a symmetrical structure, the right rear wheel house 5 will be mainly described below, and the detailed description of the left rear wheel house 5 will be omitted.
As shown in FIGS. 1 to 4 and 8, the rear wheel house 5 includes a wheel house outer (not shown) that bulges outward from the lower end of the side panel inner 2a and a lower end of the side panel inner 2a. The wheel house inner 5a bulges inward in the vehicle width direction.
The wheel house outer is formed in a partial annular shape, the upper edge portion is connected to the arc-shaped lower end portion of the side panel inner 2a, and the lower edge portion is connected to the lower end portion of the side panel outer.
The wheel house outer is provided with an upper rain outer (not shown). The upper rain outer is formed in a hat shape in cross section, the upper edge portion is connected to the outer side portion of the side panel inner 2a in the vehicle width direction, and the lower edge portion is connected to the upper portion of the wheel house outer.

The wheel house inner 5a is formed in a partial bowl shape and includes a suspension housing 12, an upper rain inner 13, a rear gusset 14, a front gusset 20, and the like.
The suspension housing 12 is provided on the upper part of the wheel house inner 5a so as to protrude toward the vehicle compartment side, and constitutes a columnar space in which the damper device 4a of the rear suspension 4 can be accommodated. A damper support portion 12a capable of supporting the upper end of the damper device 4a is provided at a substantially central portion of the suspension housing 12 in the front-rear direction. The damper support portion 12a is formed in a substantially horizontal shape at the upper position of the wheel house inner 5a, and the outer end in the vehicle width direction is joined to the side panel inner 2a.

  As shown in FIGS. 1 to 3, the upper rain inner 13 is integrally formed with a substantially U-shaped cross section, and is connected to the inner side in the vehicle width direction of the side panel inner 2 a at a position where the upper end corresponds to the upper end of the upper rain outer. The lower end is connected to the wheel house inner 5 a and the suspension housing 12. The upper rain inner 13 is for attaching the front side bulging portion 13a bulging toward the vehicle interior side at the front end portion, the rear side bulging portion 13b bulging toward the vehicle interior side at the rear end portion, and the damper device 4a. Working opening 13c.

As shown in FIGS. 1 to 7, a substantially straight rear gusset 14 is disposed on the side wall surface of the vehicle interior of the wheel house inner 5 a, and is substantially L-shaped when viewed from the front in front of the rear gusset 14. The front gusset 20 is provided.
The rear gusset 14 includes a main body portion 14a having a substantially U-shaped cross section and a pair of front and rear flange portions 14b extending from the front and rear ends of the main body portion 14a. The rear gusset 14 has an upper end joined to the lower end of the rear bulge portion 13b, a lower end joined to the step portion 10b of the rear side frame 3, and a pair of flange portions 14b joined to the wheel house inner 5a. . Thus, the rear gusset 14 forms a closed cross section extending in the vertical direction for connecting the position in the vicinity of the rear side of the damper support portion 12 a and the rear side frame 3.

The front gusset 20 includes a first gusset portion 21 that extends in the vertical direction and a second gusset portion 22 that extends inward in the vehicle width direction from the lower portion of the first gusset portion 21.
As shown in FIGS. 2 to 7, the first gusset portion 21 includes a main body portion 21a having a substantially U-shaped cross section and a pair of front and rear flange portions 21b extending from the front and rear ends of the main body portion 21a. . The first gusset portion 21 has an upper end spot-joined to the lower end of the front bulge portion 13a, a lower end spot-joined to the upper end of the second gusset portion 22, and a pair of flange portions 21b spot-joined to the wheel house inner 5a. Has been. Thereby, the 1st gusset part 21 comprises the closed cross section extended straightly downward from the front side vicinity position of the damper support part 12a.

As shown in FIGS. 2-7, the 2nd gusset part 22 is comprised by cross-sectional substantially U shape, and the upper end of the front wall part 22a, the rear wall part 22b, the front wall part 22a, and the rear wall part 22b And an upper wall portion 22c connected to the upper wall portion 22c. The front wall portion 22a and the rear wall portion 22b are spot-bonded to the front wall portion 8a and the rear wall portion 8b of the upper member member 8, respectively, and the left end (inner end in the vehicle width direction) of the upper wall portion 22c is an opening portion 8d. Is spot-bonded to the upper wall portion 8c. Since the second gusset portion 22 is disposed to face the upper wall portion 10a and the step portion 10b of the rear side frame 3 through the opening 8d, the first gusset portion cooperates with the rear side frame 3 and the upper member member 8. 21 constitutes a closed cross-section extending inward in the vehicle width direction.
Therefore, the front gusset 20 forms a substantially L-shaped closed section in cooperation with the wheel house inner 5a, the rear side frame 3, and the cross member 6.

Next, the reinforcing member 30 will be described.
As shown in FIGS. 4 and 6 to 9, a reinforcing member 30 is accommodated inside the closed cross section formed by the front gusset 20. The reinforcing member 30 includes a honeycomb structure 31 and a foamed adhesive 32 for adhesively bonding the honeycomb structure 31 to each vehicle body member. The adhesive 32 has a thickness of, for example, about 1 mm before foaming, and foams to a thickness of several times, for example, 2 to 3 mm above a predetermined temperature, so that the honeycomb structure 31 and each vehicle body member can be bonded. It has unique properties.

  As shown in FIGS. 9A to 9D, the honeycomb structure 31 is made of a synthetic resin material containing glass fiber as a raw material, and includes a front surface portion 33, a rear surface portion 34, and an upper surface portion. 35, a lower surface portion 36, a right surface portion 37, and a plurality of ribs 38 having surfaces extending in the front-rear direction. The outer shape of the honeycomb structure 31 is a substantially L-shaped closed section formed by the front gusset 20, the wheel house inner 5a, the rear side frame 3 (upper wall portion 10a, stepped portion 10b), and the upper member member 8 in cooperation. And substantially the same shape.

In the present embodiment, since the die cutting direction is set to the front side, a wall made of synthetic resin is formed on each of the surface portions 34, 35, 36, and 37, and a wall that closes the front surface portion 33 is omitted. .
Therefore, as shown in FIG. 9D, the adhesive 32 is adhered to the rear surface portion 34, the upper surface portion 35, the lower surface portion 36, and the right surface portion 37.

  The plurality of ribs 38 are arranged in a lattice shape so that the mold can be removed from the front surface portion 33 side during molding. Thereby, the inside of the honeycomb structure 31 is configured to be hollow except for the plurality of ribs 38. In the lower part of the honeycomb structure 31, a step-shaped portion 39 capable of being in surface contact with the upper surface shape of the upper wall portion 10 a and the stepped portion 10 b of the rear side frame 3 is provided. A part of the lower portion of the front surface portion 33, a portion of the lower portion of the rear surface portion 34, and a portion of the lower surface portion 36 constitute a step-shaped portion 39.

Next, a procedure for mounting the reinforcing member 30 will be described.
In the pre-joining stage of the front gusset 20, the reinforcing member 30 is placed with the front surface portion 33 facing forward so that the stepped portion 39 comes into surface contact with the upper surfaces of the upper wall portion 10a and the step portion 10b. Thereafter, the front gusset 20 in which the first gusset portion 21 and the second gusset portion 22 are bonded in advance is spot-bonded to the upper member member 8, and the reinforcing member 30 is covered from the top, while the stepped portion 10b is spot-bonded, Spot welding is performed with the wheel house inner 5a to which the front bulging portion 13a is previously bonded.

Then, it heats up to the foaming temperature or more of the adhesive agent 32 in the drying furnace of a coating process.
At this time, since the adhesive 32 is adhered to the rear surface portion 34, the upper surface portion 35, the lower surface portion 36, and the right surface portion 37, the rear surface portion 34 becomes the front gusset 20 and the upper member member. 8 is bonded to the rear wall portion 8b, the upper surface portion 35 is bonded to the front gusset 20, the lower surface portion 36 is bonded to the rear side frame 3, and the right surface portion 37 is bonded to the wheel house inner 5a. As a result, the section modulus of the closed section including the connecting portion between the lower portion of the wheel house inner 5a and the rear side frame 3 (upper wall portion 10a and stepped portion 10b) can be increased, and the section rigidity is increased.

Based on FIG. 10, the reinforcing member 30A according to the first modification of the reinforcing member 30 will be described.
In the reinforcing member 30 of the first embodiment, since the die cutting direction is set to the front side, the wall that blocks the front surface portion 33 is omitted. However, in the reinforcing member 30A of the first modification, the die cutting direction is set to the diagonally up and down direction. Yes.

  As shown in FIGS. 10A to 10D, the honeycomb structure 31A includes a plurality of ribs 38A having a surface extending in the front-rear direction and a pair of front and rear ribs 40 having a surface extending in the vertical direction. And walls are formed on the respective surface portions 33A, 34A, and 37A with a synthetic resin, and a portion of the wall that covers the upper surface portion 35A and the lower surface portion 36A is partially omitted.

  As shown in FIGS. 10 (c) and 10 (d), an opening 35a extending in the vehicle width direction corresponding to a portion sandwiched between the pair of front and rear ribs 40 is formed in the front and rear direction central portion of the upper surface portion 35A. Is formed. As shown in FIG. 10 (d), the front and rear portions of the lower surface portion 36A correspond to the space between one rib 40 and the front surface portion 33A and between the other rib 40 and the rear surface portion 34A. Thus, a pair of front and rear openings 36a extending in the vehicle width direction is formed. The step-shaped portion 39A is constituted by a part of the lower portion of the front surface portion 33A, a portion of the lower portion of the rear surface portion 34A, and a portion of the lower surface portion 36A. Thereby, at the time of shaping | molding of the honeycomb structure 31A, the die cutting direction can be set to diagonally up-down direction.

  In the honeycomb structure 31A, since the adhesive 32 is adhered to the front surface portion 33A, the rear surface portion 34A, the upper surface portion 35A, the lower surface portion 36A, and the right surface portion 37A, the front surface portion 33A is The front gusset 20 and the front wall portion 8a of the upper member member 8 are bonded, the rear surface portion 34A is bonded to the front gusset 20 and the rear wall portion 8b of the upper member member 8, and the upper surface portion 35A is bonded to the front gusset 20. The lower surface portion 36A is bonded to the rear side frame 3, and the right surface portion 37A is bonded to the wheel house inner 5a.

Based on FIG. 11, the reinforcing member 30B according to Modification 2 of the reinforcing member 30 will be described.
In the reinforcing member 30 of the first embodiment, since the die cutting direction is set to the front side, a wall that covers the front surface portion 33 is omitted. However, in the reinforcing member 30B of the second modification, the die cutting direction is set to the front-rear direction. .

As shown in FIGS. 11A to 11D, the honeycomb structure 31B is provided with a plurality of ribs 38B having surfaces extending in a lattice shape in the front-rear direction, and the respective surface portions 35B, 36B, 37B. Are formed of a synthetic resin, and a wall that covers the front surface portion 33B and the rear surface portion 34B is omitted. The step-shaped portion 39B is constituted by a part of the lower part of the front surface part 33B, a part of the lower part of the rear surface part 34B, and a part of the lower surface part 36B.
Thereby, at the time of shaping | molding of the honeycomb structure 31B, the die cutting direction can be set to the front-back direction.

  In the honeycomb structure 31B, since the adhesive 32 is adhered to the upper surface portion 35B, the lower surface portion 36B, and the right surface portion 37B, the upper surface portion 35B is bonded to the front gusset 20, and the lower surface portion 36B is bonded to the rear side frame 3, and the right surface portion 37B is bonded to the wheel house inner 5a.

Next, based on the graphs of FIGS. 12 and 13, performance evaluation related to vehicle body torsional rigidity and suspension support rigidity will be described.
These graphs show the evaluation results of the torsional rigidity and the suspension support rigidity of the vehicle body structure in which the reinforcing members 30, 30A, 30B are respectively installed when the evaluation value of the vehicle body structure of the comparative example is 100%. In the comparative example, the reinforcing member is omitted from the inside of the front gusset 20 of the first embodiment.

  As shown in FIG. 12, the torsional rigidity of the vehicle body in both Example 1 and Modifications 1 and 2 is increased compared to the comparative example. In the evaluation of the torsional rigidity of the vehicle body, the first modified example in which a wall for closing the front surface portion and the rear surface portion is provided is the highest, and the second modified example in which the wall for closing the front surface portion and the rear surface portion is omitted is the lowest. It was an evaluation result.

  As shown in FIG. 13, the suspension support rigidity is increased in both Example 1 and Modifications 1 and 2 as compared with the comparative example. In the evaluation of the suspension support rigidity, Example 1 in which the wall that closes the front surface portion is omitted and Modification 1 in which the wall that closes the front surface portion and the rear surface portion is provided show the same evaluation results, and the front surface portion Modification 2 in which the wall that covers the rear surface portion was omitted was the lowest evaluation result.

Next, functions and effects of the rear body structure of the vehicle according to the first embodiment will be described.
According to the rear vehicle body structure of this vehicle, since the reinforcing member 30 bonded and bonded to these closed cross-section constituent members is provided inside the closed cross-section constituted by the front side gusset 20, the wheel house inner 5a, and the rear side frame 3, the vehicle is closed. Without increasing the cross-sectional area of the cross-section or filling the inside of the closed cross-section with the filler, the cross-sectional modulus of the closed cross-section can be increased, and sufficient cross-sectional rigidity can be ensured. Moreover, since the spot welding process for the reinforcing member 30 can be omitted by adhesive bonding, it is not necessary to secure a spot gun arrangement space and a work space, and the production efficiency can be increased. As a result, both the rigidity of the vehicle body and the productivity in the vicinity of the suspension housing 12 can be achieved without increasing the vehicle body weight.

  A pair of left and right rear side frames 3 are connected, and left and right end portions thereof are provided with upper member members 8 respectively connected to lower portions of a pair of left and right front gussets 20, and a reinforcing member 30 is adhesively bonded to the upper member member 8. Therefore, the load acting on the vehicle body from one damper support portion 12a can be efficiently distributed via the upper member member 8, the support rigidity by the reinforcing member 30 can be increased, and the section modulus of the closed section is further increased. be able to.

  The reinforcing member 30 includes a honeycomb structure 31 formed in substantially the same shape as the closed cross section formed by the front gusset 20 and the like, and the honeycomb structure 31 is bonded to at least the front gusset 20, the wheel house inner 5a, and the rear side frame 3. Since it is comprised with the adhesive agent 32 for joining, the reinforcement member 30 can be reduced in weight and the increase in a vehicle body weight can be suppressed further.

Since the honeycomb structure 31 has at least one of the front surface portion 33 and the rear surface portion 34 bonded and bonded to the front gusset 20 by the adhesive 32, the surface portion that contributes to improving the cross-sectional rigidity is used. The honeycomb structure 31 can be efficiently bonded to the vehicle body.
The rear side frame 3 is provided with a stepped portion 10b formed so as to protrude above the inner side in the vehicle width direction, and the honeycomb structure 31 is provided with a stepped shape portion 38 that is adhesively bonded to the upper surface of the stepped portion 10b. The height position of the inner part in the vehicle width direction can be lowered while increasing the section modulus of the frame 3, and both the vehicle body rigidity and the vertical space for the rear seat occupant can be ensured.

Next, a modification in which the above embodiment is partially changed will be described.
1] In the above-described embodiment, the example in which the front gusset is configured by the first gusset portion and the second gusset portion has been described. However, a front gusset configured by a single component may be used. It is also possible to use a front gusset composed of three or more members.

2) In the above embodiment, an example of a honeycomb structure made of a synthetic resin containing glass fibers has been described, but if a predetermined strength can be ensured only with a synthetic resin, the glass fibers can be omitted, Instead of glass fibers, reinforcing additives such as carbon fibers may be used.
Although planar ribs extending in a lattice shape have been described as the ribs of the honeycomb structure, the shape is not particularly limited, and various shapes such as a pin shape can be used. The honeycomb structure is not limited to a hexagon (hexagonal prism) but also includes a structure in which polygons (polygonal prisms) such as a triangle (triangular prism) and a quadrangle (quadrangle prism) are arranged.

3) In the above-described embodiment, the example in which the reinforcing member is simply placed so that the step-shaped portion is in surface contact with the upper wall portion and the upper surface of the step portion in the pre-joining stage of the front gusset has been described. The structure may be temporarily fixed to the vehicle body. In this case, a plurality of bin holes are provided in the honeycomb structure and a plurality of locking pins are provided in the vehicle body member, for example, the upper member member, and the honeycomb structure is formed by engagement of the locking pins and the bin holes before the front gusset is joined. Position the body relative to the car body.

4) In addition, those skilled in the art can implement the present invention in various forms added with various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. is there.

  In the rear body structure of a vehicle equipped with a wheel house gusset, the present invention accommodates a reinforcing member inside the wheel house gusset, and adhesively bonds the reinforcing member to the wheel house gusset, the wheel house, and the rear side frame. Without increasing the weight of the vehicle body, both the rigidity of the vehicle body and the productivity in the vicinity of the suspension housing can be achieved.

2a Side panel inner 3 Rear side frame 4 Rear suspension 5a Wheel house inner 8 Upper member member 10b Stepped portion 12a Damper support portion 20 Front gussets 30, 30A, 30B Reinforcing members 31, 31A, 31B Honeycomb structure 32 Adhesives 33, 33A, 33B Front surface portion 34, 34A, 34B Rear surface portion 39, 39A, 39B Stepped shape portion V Vehicle

Claims (3)

A pair of left and right wheel houses that bulge from the side wall of the vehicle body to the vehicle interior side and that has a damper support portion for a suspension member at the top, and a pair of left and right wheels that are connected to the lower part of the pair of left and right wheel houses and extend in the front-rear direction Vehicle body rear structure including a rear side frame of the vehicle, a pair of left and right wheel house gussets that connect the vicinity of the damper support portion and the rear side frame on the vehicle interior side,
The rear side frame includes a stepped portion formed so as to protrude above the inner side in the vehicle width direction,
The wheel house gusset forms a substantially L-shaped closed section in front view in cooperation with the wheel house and the rear side frame,
A reinforcing member bonded and bonded to the wheel house gusset, the wheel house and the rear side frame is provided inside the closed cross section ,
The reinforcing member includes a honeycomb structure formed in substantially the same shape as the closed cross section, and an adhesive for bonding the honeycomb structure to at least the wheel house gusset, the wheel house, and the rear side frame. ,
A rear body structure of a vehicle, wherein the honeycomb structure is provided with a step-shaped portion that is adhesively bonded to an upper surface of the step portion . The left and right pair of rear side frames are connected to each other, and left and right end portions thereof are provided with cross member members respectively connected to lower portions of the left and right pair of wheel house gussets,
The rear body structure of the vehicle according to claim 1, wherein the reinforcing member is bonded to the cross member member. 3. The vehicle according to claim 1 , wherein at least one of the front surface portion and the rear surface portion of the honeycomb structure is bonded and bonded to the wheel house gusset with the adhesive. 4. Rear body structure.