JP2010247610A - Vehicle body rear structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the rigidity of a vehicle body by suppressing the torsion of the vehicle body in a manner matching the characteristics of a vehicle body structure. <P>SOLUTION: This vehicle body rear structure includes a left reinforcing bar (left reinforcing member) 38 installed between the center part 34a of a rear cross member 34 and the front part 15a of a left rear frame 15, a right reinforcing bar (right reinforcing member) 39 installed between the center part 34a of the rear cross member 34 and the front part 16a of a right rear frame 16, right and left longitudinal members 27, 27 which join right and left center pillars 18, 18 and right and left rear damper housings 25, 25 via right and left rear pillars 23, 23, respectively, and an upper cross member 36 joining the right and left longitudinal members 27, 27 to each other. A rear bulk head 51 of generally chevron shape is installed between a front cross member (lower cross member) 33 and the upper cross member 36. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rear structure of a vehicle body in which upper cross members are passed to upper portions of left and right rear pillars, lower cross members are passed to left and right rear frames, and rear bulkheads are provided on the upper and lower cross members.

2. Description of the Related Art As a vehicle body rear structure, a structure in which twisting of a vehicle body rear portion where a front portion of a trunk room is located from the rear of a passenger compartment is known.
This type of vehicle body rear structure reinforces the torsion center of the vehicle body.
As such a vehicle body rear structure, an upper cross member is passed to the upper part of the left and right rear pillars, a lower cross member is passed to the left and right rear frames, and a substantially V-shaped rear bulk head is provided on these upper and lower cross members. Is known (for example, see Patent Document 1).

The rear structure of the vehicle body of Patent Document 1 is provided with a floor tunnel extending in the longitudinal direction of the vehicle body at the center of the floor panel, a tunnel reinforcement provided along the floor tunnel, and forming a closed cross section with the floor tunnel, An upper cross member provided in the vehicle width direction at the top, a left reinforcing member that connects the left end portion of the upper cross member and the tunnel reinforcement, and a right end portion of the upper cross member and the tunnel reinforcement are connected. And a right reinforcing member.
In other words, the torsion center of the vehicle body is reinforced by the left and right reinforcing members arranged in a V shape.

For example, in a vehicle body provided with a substantially C-shaped left and right brace bar (reinforcing member) opened toward the front of the vehicle body at the lower part of the vehicle body rear structure of Patent Document 1, torsion below the vehicle body is suppressed, It is known that the torsion center of the vehicle body moves upward. Therefore, a countermeasure for suppressing the torsion of the vehicle body in accordance with the characteristics of the vehicle body structure is desired.

JP 2003-137137 A

  An object of the present invention is to provide a vehicle body rear structure capable of suppressing vehicle body torsion and improving vehicle body rigidity by a method commensurate with characteristics of the vehicle body structure.

  The invention according to claim 1 includes left and right center pillars forming a skeleton on the side of the vehicle body, left and right rear pillars forming a skeleton on the side of the rear of the vehicle, left and right side sills extending in the longitudinal direction of the vehicle, and left and right side sills. Left and right rear frames extending from the rear to the rear of the vehicle body, left and right rear damper housings supported by the left and right rear frames, a rear cross member extending behind the left and right rear frames, and the left and right rear frames In the rear structure of the vehicle body having a front cross member (lower cross member) passed to the front of the left reinforcing member passed to the center of the rear cross member and the front of the left rear frame, and the rear cross member The left and right center pillars and the left and right rear dampers are routed through the right reinforcing member and the left and right rear pillars. The left and right front and rear members that connect the housing and the upper cross member that connects the left and right front and rear members, and a substantially bulky rear bulk between the front cross member (lower cross member) and the upper cross member. A head is provided.

  The invention according to claim 2 is a panel in which the rear bulkhead covers a substantially rectangular opening composed of an upper cross member, a front cross member (lower cross member), and left and right inner panels of left and right rear pillars, This panel is formed by forming a substantially bead-shaped reinforcing bead.

The present invention has the following effects.
In the invention according to claim 1, left and right center pillars forming a skeleton on the side of the vehicle body are provided, left and right rear pillars forming a skeleton on the side of the rear of the vehicle body are provided, and left and right side sills are extended in the vehicle body longitudinal direction The left and right rear frames extend from the rear of the left and right side sills to the rear of the vehicle body, and left and right rear damper housings are provided to be supported by the left and right rear frames. The front cross member (lower cross member) was passed in front of the left and right rear frames.
Via the left and right rear pillars, the left and right center pillars and the left and right rear damper housings are connected by the left and right front and rear members, respectively, and the left and right front and rear members are connected by the upper cross member.
A left reinforcing member passed to the center portion of the rear cross member and the front portion of the left rear frame, and a right reinforcing member passed to the center portion of the rear cross member and the front portion of the right rear frame are provided. It is known that the torsion center of the car body moves upward because the torsion of the car body below is suppressed. Therefore, by providing a substantially C-shaped rear bulkhead between the front cross member (lower cross member) and the upper cross member, it is possible to take measures to suppress the torsion of the vehicle body in accordance with the characteristics of the vehicle body structure. it can. As a result, the vehicle body rigidity can be improved.

In the invention according to claim 2, the rear bulkhead is a panel that covers a substantially rectangular opening composed of an upper cross member, a front cross member (lower cross member), and left and right inner panels of left and right rear pillars, Since the substantially C-shaped reinforcing bead is formed on this panel, the rear bulkhead can be composed of one part. As a result, the rear bulkhead can be simplified.
In addition, since a substantially C-shaped reinforcing bead is formed on the panel, other peripheral parts can be attached to the rear bulkhead, for example. As a result, the rear bulkhead can be multifunctional.

It is a perspective view from the rear upper part of the vehicle body rear structure according to the present invention. It is the perspective view seen from the rear part lower part of the vehicle body rear part structure shown by FIG. It is a front view of the vehicle body rear part structure shown by FIG. It is a schematic diagram of the stress concentration of the vehicle body rear structure shown in FIG. FIG. 2 is a comparative study diagram of the vehicle body rear structure shown in FIG. 1.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

  As shown in FIGS. 1 to 3, the vehicle body rear structure 20 includes left and right side sills 13 and 13 extending in the longitudinal direction of the vehicle body, and left and right rear sills extending from the rear ends of the side sills 13 and 13 toward the rear of the vehicle body. Frames 15, 16; a front floor 17 supported by left and right side sills 13, 13; a floor tunnel 19 extending in the front-rear direction at the center of the front floor 17, and extending from the floor tunnel 19 to the left and right; The left and right connecting members 21, 21 connected to the left and right side sills 13, 13, the middle cross member 22 passed to the front portions 15 a, 16 a of the left and right rear frames 15, 16, and the left and right rear frames 15, 16 A front cross member (lower cross member) 33 passed to the front of the rear portions 15b, 16b and the rear portions 15b, 16b of the left and right rear frames 15, 16 The rear cross member 34 passed in the middle, the rear end cross member 35 connecting the rear end portions of the left and right rear frames 15 and 16, and the left and right rear dampers provided outside the rear portions of the left and right rear frames 15 and 16 Housings 25, 25, rear damper cross members 41 passed to the left and right rear frames 15, 16 at the front and rear positions of the left and right rear damper housings 25, 25, and outside the rear damper housings 25, 25. The left and right rear wheel houses 26, 26, the left reinforcing bar (left reinforcing member) 38 that connects the front portion 15 a of the left rear frame 15 and the central portion 34 a of the rear cross member 34, and the front of the right rear frame 16 Standing from the right reinforcement bar (right reinforcement member) 39 connecting the portion 16a and the central portion 34a of the rear cross member 34, and the rear portions of the left and right side sills 13,13 Left and right center pillars 18, 18, left and right rear pillars 23, 23 provided behind these center pillars 18, 18, an upper cross member (rear parcel member) 36 passed to the left and right rear pillars 23, 23, The parcel shelf 37 supported by the upper cross member 36 and the front and rear members 27, 27 (one side) passed from the left and right center pillars 18, 18 to the left and right rear damper housings 25, 25 via the left and right rear pillars 23, 23. (Not shown), rear wheel house upper members 28 and 28 (one not shown) passed from the left and right rear damper housings 25 and 25 to the rear end cross member 35, an upper cross member 36 and a front cross member (lower cross member). ) 33 in the vertical direction of the vehicle body, and a rear bulkhead (partition) that partitions the compartment 12 and the cargo compartment 14. Member) 51.

Specifically, the upper cross member (rear parcel member) 36 is supported by front and rear members (quarter lower members) 27 and 27 that pass through the left and right rear pillars 23 and 23.
The left and right side sills 13 are arranged linearly in the longitudinal direction of the vehicle body.
The left and right rear frames 15 and 16 have front portions 15a and 16a that are curved inwardly of the vehicle body and are curved and formed above the vehicle body. Further, the rear portions 15b and 16b are formed linearly.

  The left and right reinforcing bars (left and right braces) 38 and 39 are left and right reinforcing members arranged obliquely in a letter C shape with the front opening. The reinforcement bars 38 and 39 are configured with high strength in a closed cross-sectional structure.

  The upper cross member 36, the front cross member (lower cross member) 33 and the left and right inner panels 24, 24 of the left and right rear pillars 23, 23 form a substantially rectangular opening 52. The rear bulkhead (partition member) 51 is a member that partitions the substantially rectangular opening 52, and is a member that improves vehicle body rigidity.

  The rear bulkhead (partition member) 51 includes a main body panel 56, left and right upper coupling portions 53, 53 coupled to the upper cross member 36, and left and right lower portions coupled to the front cross member (lower cross member) 33. Provided between the coupling portions 54, 54 and the central lower coupling portion 55, the left coupling portion 57 and the right coupling portion 58 coupled to the left and right rear wheel houses 26, 26, and the upper coupling portion 53 and the left coupling portion 57. Left reinforcement beads 61, 61, right reinforcement beads 62, 62 provided between the upper coupling portion 53 and the right coupling portion 58, and outside the upper portions of the left and right reinforcement beads 61, 61, 62, 62. Between the left and right cutouts 64, 64 and the left and right reinforcing beads 61, 61, 62, 62 for assembling the harness and electrical parts. Central hole for 5, provided in the lower part in between the left and right reinforcing bead 61,61,62,62 comprises a central cutout 66 Metropolitan of the left and right for assembling harness and electrical components.

  As shown in FIG. 4, in the vehicle having the vehicle body rear structure 20, it is experimentally required that areas where stress is concentrated in the installation portion of the rear bulkhead 51 are areas S <b> 1 and S <b> 2. Furthermore, it has been experimentally confirmed that the areas S1 and S2 appear in a C shape opened upward. Therefore, it is expected that the body rigidity can be improved efficiently by increasing the strength of the areas S1 and S2 which are stress concentration sites.

  5A shows a rear body structure 100 of a comparative example, and the rear body structure 100 has a left and right reinforcing bar (left and right) in the lower part of the vehicle body with the front shown in FIG. The reinforcing members 38 and 39 are not provided. In the vehicle body rear structure 100, it has been experimentally required that the vehicle torsion center C1 around the vehicle center line is located approximately near the center in the vehicle vertical direction. Furthermore, in the vehicle body rear structure 100, it is known that areas T1 to T4 where stress concentrates appear in an X shape with the vehicle body torsion center C1 as a base point.

  In FIG. 5B, the vehicle body rear structure 20 of the embodiment is shown. The vehicle body rear structure 20 is located on the center portion 34a of the rear cross member 34 (see FIG. 2) and the front portion 15a of the left rear frame 15. The reinforcing bar (left reinforcing member) 38 is passed, and the right reinforcing bar (right reinforcing member) 39 is passed to the center part 34a of the rear cross member 34 and the front part 16a of the right rear frame 16. It is.

  In the vehicle body rear structure 20, since twisting below the vehicle body is suppressed, it is experimentally required that the torsion center C <b> 2 of the vehicle body moves upward. Furthermore, in the vehicle body rear structure 20, it is known that areas S1 and S2 where stress concentrates appear in a C shape with the vehicle body torsion center C2 as a base point (see FIG. 4).

  As shown in FIG. 3, the left and right reinforcing beads 61, 61, 62, 62 are strength improving portions formed in a substantially C shape provided in the areas S 1, S 2 where the stress shown in FIG. 4 is concentrated. is there.

  The vehicle body rear structure 20 is provided with left and right center pillars 18 and 18 that form a skeleton on the side of the vehicle body, left and right rear pillars 23 and 23 that form a skeleton on the side of the vehicle body rear side, and left and right side sills 13 in the vehicle longitudinal direction. 13 are extended from the rear of the left and right side sills 13 and 13 to the rear of the vehicle body, and the left and right rear dampers are supported by the left and right rear frames 15 and 16, respectively. Housings 25, 25 were provided, a rear cross member 34 was passed to the rear of the left and right rear frames 15, 16, and a front cross member (lower cross member) 33 was passed to the front of the left and right rear frames 15, 16.

  The left and right center pillars 18, 18 and the left and right rear damper housings 25, 25 are connected by left and right front and rear members 27, 27 via the left and right rear pillars 23, 23, respectively. Connect with the cross member 36.

  A left reinforcing bar (left reinforcing member) 38 passed between the central portion 34a of the rear cross member 34 and the front portion 15a of the left rear frame 15, the central portion 34a of the rear cross member 34, and the right rear frame 16 In a vehicle body provided with a right reinforcement bar (right reinforcement member) 39 provided to the front portion 16a, it is known that the torsion center of the vehicle body moves upward because torsion of the vehicle body below is suppressed. Therefore, by providing a substantially C-shaped rear bulkhead 51 between the front cross member (lower cross member) 33 and the upper cross member 36, a measure for suppressing the torsion of the vehicle body in accordance with the characteristics of the vehicle body structure. Can be applied. As a result, the vehicle body rigidity can be improved.

  The rear bulkhead 51 is a panel that covers a substantially rectangular opening 52 formed by an upper cross member 36, a front cross member (lower cross member) 33, and left and right inner panels 24, 24 of the left and right rear pillars 23, 23. The left and right reinforcing beads 61, 61, 62, 62 are formed on the panel, so that the rear bulkhead 51 can be composed of a single component. As a result, the rear bulkhead 51 can be simplified.

  Further, since the left and right reinforcing beads 61, 61, 62, 62 having a substantially C-shape are formed on the panel, other peripheral parts can be attached to the rear bulkhead 51, for example. As a result, the rear bulkhead 51 can be multifunctional.

In the vehicle body rear structure according to the present invention, as shown in FIG. 3, the rear bulkhead 51 is provided with the reinforcing beads 61, 61, 62, 62. However, the present invention is not limited to this. You may use a stiffener together.
As shown in FIG. 3, the vehicle body rear structure according to the present invention is provided with two left reinforcing beads 61 and 61 and two right reinforcing beads 62 and 62 on the left and right, but the number of reinforcing beads is arbitrary. is there.

  The vehicle body rear structure according to the present invention is suitable for use in passenger cars such as sedans and wagons.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 13 ... Side sill, 15, 16 ... Left and right rear frame, 18 ... Center pillar, 20 ... Car body rear structure, 23 ... Rear pillar, 24 ... Inner panel, 25 ... Rear damper housing, 27 ... Front and rear members Members), 33 ... front cross members (lower cross members), 34 ... rear cross members, 36 ... upper cross members (rear parcel members), 38, 39 ... left and right reinforcing bars (left and right reinforcing members), 51 ... rear Bulkhead, 52 ... opening, 61, 62 ... left and right reinforcing beads.

Claims (2)

Left and right center pillars forming the skeleton on the side of the vehicle body, left and right rear pillars forming the skeleton on the side of the rear of the vehicle, left and right side sills extending in the longitudinal direction of the vehicle, and extending from the rear of these left and right side sills to the rear of the vehicle Left and right rear frames, left and right rear damper housings supported by the left and right rear frames, a rear cross member passed to the rear of the left and right rear frames, and a front cross passed to the front of the left and right rear frames A vehicle body rear structure including a member,
A left reinforcing member passed to the center of the rear cross member and the front of the left rear frame, and a right reinforcing member passed to the center of the rear cross member and the front of the right rear frame And left and right front and rear members that respectively connect the left and right center pillars and the left and right damper housings via the left and right rear pillars, and an upper cross member that connects these left and right front and rear members,
A rear structure of a vehicle body, wherein a substantially bulky rear bulkhead is provided between the front cross member and the upper cross member.   The rear bulkhead is a panel that covers a substantially rectangular opening composed of the upper cross member, the front cross member, and the left and right inner panels of the left and right rear pillars. The vehicle body rear part structure according to claim 1, wherein the vehicle body rear part structure is formed.

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