JP2012201228A - Rear body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rear body structure capable of efficiently improving the torsional rigidity of the body of an automobile, and of thus efficiently improving a weight reduction of the body resulting from a thickness reduction using a high tension steel plate.SOLUTION: The rear body structure 10 includes a floor panel, rear wheel houses 20 formed on the right and left parts of the floor panel, rear strut towers 25 provided corresponding to the rear wheel houses 20, and rear pillars 50 connected to the sides of the floor panel and to the rear wheel houses 20, wherein a reinforcing member 70 is provided for connecting the floor panel to each of the rear pillars 50, the reinforcing member 70 having a reinforcing protruded part extending from the center part toward the left side upper part, the left side lower part, the right side upper part, and the right side lower part in view from the rear side of the body.

Description

  The present invention relates to a rear vehicle body structure for improving torsional rigidity of an automobile body.

As is well known, in order to absorb the increase in weight due to improvements in fuel efficiency and athletic performance of automobiles, safety measures and equipment enhancement, it is required to reduce the weight of automobiles. The weight of the vehicle body is being reduced by reducing the thickness of the vehicle body structure.
For example, when a 590 MPa class high-strength steel plate is used to reduce the weight of the vehicle body, it is possible to achieve a weight reduction of about 40% compared to conventional steel plates while ensuring the strength of the vehicle body, and a very significant result is expected. Can do.

On the other hand, since automobiles receive various forces such as the force received from road surface irregularities during travel and the impact when riding on road shoulders, etc., torsional rigidity is required in addition to vehicle body strength. When the vehicle body structure is made thinner, the torsional rigidity generally decreases even if the vehicle body strength is ensured.
This is because the Young's modulus of iron is constant even if the tensile strength of the steel sheet is improved due to temperature history, components, etc., and when the vehicle body structure is thinned, the cross-sectional secondary pole moment becomes smaller. This is because the torsional rigidity decreases.
Therefore, when the vehicle body is thinned and lightened, it is necessary to improve torsional rigidity.

For example, the torsional rigidity of the vehicle body is evaluated by measuring a torsion angle or a load corresponding to the torsion angle as shown in FIG. 10 using a torsional rigidity measuring method as shown in FIG.
FIG. 9 is a conceptual diagram showing a method for measuring torsional rigidity of the white body (vehicle body) 100, and FIG. 10 is a view for explaining torsional rigidity based on the torsion of the front axle center 100F with reference to the rear axle center 100R.

  For example, as shown in FIG. 9A, the torsional rigidity is measured by fixing the white body 100 at the rear axle center (rear axle position) 100R with the rear strut R, and connecting the front axle center ( Evaluation is based on an average torsional rigidity value GJ obtained by applying a torsional torque to the front axle position 100F. (G: transverse elastic modulus, J: cross-sectional polar second moment)

  The torsion torque T with respect to the front axle center 100F is, for example, as shown in FIG. 9B as a view taken along arrow YY in FIG. 9A, with the upper ends of the dummy bars 101 on the left and right front struts FL and FR, respectively. Mounting is performed by rotating the seesaw base 102 to which the lower end of the dummy bar 101 is attached around the axis O.

The torsional rigidity value GJ is shown in FIG. 10 as viewed from the direction of arrows XX in FIG. 9A. The torsional rigidity value GJ It is calculated based on the displacements δL and δR. In FIG. 10, 100D indicated by a two-dot chain line and a solid line indicates the vehicle body (outer shape) of the front axle center 100F before and after the torsion torque T is applied.
Here, the torsion angle θ (rad) due to the torsion torque T is small.
θ≈tan θ = ((δL + δR) / B); (B is a vehicle body width dimension related to the torsion torque T load at the front axle center 100F).
Torsional rigidity value GJ = (T / (θ / wheelbase length L))
= (T · B · Wheelbase length L) / (δL + δR)
It becomes. (See, for example, “Strength of Automobiles” (Sankaido Co., Ltd., October 30, 1990, second print)

  For improving the torsional rigidity of the vehicle body, for example, techniques disclosed in Patent Documents 1 and 2 are disclosed as techniques focusing on the rear vehicle body structure.

JP 2003-137140 A JP 2006-335088 A

  However, in order to promote weight reduction by reducing the thickness of the vehicle body structure, the above prior art alone is not sufficient, and there is a strong demand for a more effective technique that is intended to improve the future strength of high-tensile steel sheets.

  The present invention has been made in view of such circumstances, and the rear body structure that can efficiently improve the torsional rigidity of the body of an automobile, and further, by thinning using a high-tensile steel plate, An object of the present invention is to provide a rear vehicle body structure that can improve the efficiency efficiently.

In order to solve the above problems, the present invention proposes the following means.
The invention according to claim 1 is a floor panel, a rear wheel house formed on left and right portions of the floor panel, a strut tower provided corresponding to the rear wheel house, a side part of the floor panel, and A rear vehicle body structure including a rear pillar connected to the rear wheel house, including a reinforcing member that interconnects the floor panel and each of the rear pillars, and the reinforcing member is viewed from the rear of the vehicle body Sometimes, it is characterized by comprising a main reinforcing shape portion extending from the central portion toward the upper left portion, the lower left portion, the upper right portion, and the lower right portion.

According to the rear vehicle body structure related to the present invention, the reinforcing member having the main reinforcing shape portion extending from the central portion toward the left upper portion, the left lower portion, the right upper portion, and the right lower portion mutually connects the floor panel and the left and right rear pillars. Therefore, it is possible to efficiently suppress the generation of a moment that shifts the upper portion of the rear vehicle body structure in the left-right direction with respect to the floor panel, thereby improving the torsional rigidity of the vehicle body.
The main reinforcing shape part is
(1) Reinforcement shape part that connects the upper and lower diagonal parts in the vehicle body width direction from the center part to each other (2) Reinforcement shape part that connects from the center part to the upper and lower diagonal parts in the vehicle body width direction partway (3) Reinforcement shape parts (4) (1) to (3) in which the reinforcement shape is not formed in the central portion, and the reinforcement shape is not formed in the middle. Reinforcement shape part (5) In addition to (1) to (4), it is a concept including a reinforcement shape part in which another reinforcement shape part is formed.
The surface including the reinforcing member is
(1) A plane including the center of the load applied to the left and right rear strut towers (2) A plane including the center of the load applied to the left and right rear strut towers when the rear body structure is viewed from the side. When the parallel (3) rear vehicle body structure is viewed from the side, it may be disposed in any direction deviating from the plane including the center of the load applied to the left and right rear strut towers.

  The invention according to claim 2 is the rear vehicle body structure according to claim 1, wherein the reinforcing member includes a main panel in which the main reinforcing shape portion is formed, and one end portion of the main panel in the vehicle body width direction. A pair of sub-panels connected to the outside and having the other end portion erected and connected to the inner side in the vehicle width direction of the rear pillar.

According to the rear vehicle body structure according to the present invention, the reinforcing member includes the main panel and the sub panel, and the main panel is connected to the left and right rear pillars via the rear panel, so that the auxiliary member is easily connected to the rear pillar. be able to.
Moreover, when the main panel is configured to be connectable to the sub panel, the main panel can be easily separated from the sub panel, and the opening can be easily formed in the reinforcing member.

  A third aspect of the present invention is the rear vehicle body structure according to the first or second aspect, wherein the rear pillar is connected between the left and right above the reinforcing member.

  According to the rear vehicle body structure according to the present invention, for example, the left and right rear pillars are connected above the reinforcing member by the upper back, the side cross member, etc. (Approach and separation) is suppressed. As a result, the torsional moment of the vehicle body structure can be improved efficiently.

  The invention according to claim 4 is the rear vehicle body structure according to claim 2 or claim 3, wherein the sub panel is a seat back side panel.

  According to the rear vehicle body structure relating to the present invention, since the sub panel is composed of the left and right seat back side panels, the torsional rigidity can be improved while effectively utilizing the space without occupying the space in the trunk room. .

  The invention according to claim 5 is the rear vehicle body structure according to any one of claims 1 to 4, wherein the reinforcing member is formed in the vehicle body width direction in addition to the main reinforcing shape portion. It is characterized by comprising at least one of the first auxiliary reinforcing shape portion formed and the second auxiliary reinforcing shape portion formed in the vehicle body height direction.

  According to the rear vehicle body structure related to the present invention, since at least one of the first auxiliary reinforcing shape portion and the second auxiliary reinforcing shape portion is formed in addition to the main reinforcing shape portion, the torsional rigidity is efficiently improved. can do.

  According to the rear vehicle body structure relating to the present invention, the torsional rigidity of the vehicle body of an automobile can be efficiently improved.

It is a figure showing the outline of the whole structure of the body concerning a 1st embodiment of the present invention. It is a perspective view which shows the rear part vehicle body structure which concerns on 1st Embodiment. It is the figure which looked at the reinforcement member which concerns on 1st Embodiment from the vehicle body back. It is the schematic which looked at the reinforcement member which concerns on 1st Embodiment from the side surface. It is a figure which shows the outline of the main panel which concerns on 1st Embodiment. It is a figure which shows the outline of the main panel which concerns on the 2nd Embodiment of this invention. It is a figure which shows the outline of the main panel which concerns on the 3rd Embodiment of this invention. It is the schematic which looked at the modification by the attachment position of the reinforcement member which concerns on the 1st to 3rd embodiment of this invention by the side view. It is the schematic which shows an example of the torsional rigidity measurement method of a vehicle body, (A) is a position which applies the load in the longitudinal direction of a vehicle body structure, (B) is a YY arrow line view in (A), It is a figure explaining the outline of the torque generation in the width direction of a vehicle body. It is a figure explaining the torsional rigidity of a vehicle body, and is a XX arrow view in FIG. 9 (A), and is a figure explaining the displacement and torsion angle of a vehicle body before and after applying torsion torque.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a diagram showing an outline of a vehicle body structure according to the first embodiment of the present invention. Reference numeral 1 denotes, for example, a vehicle body structure related to a monocoque body, and reference numeral 10 denotes a rear vehicle body structure.
In the vehicle body structure 1, constituent members are made of, for example, 590 MPa class high-tensile steel, and unless otherwise specified, each member is connected by spot welding (note that spot welding is appropriately described. ).

  As shown in FIGS. 2 and 3, the rear vehicle body structure 10 includes, for example, a floor panel 15, a rear wheel house 20, a rear strut tower 25, a seat back panel 40, a rear pillar 50, an upper back 60, The reinforcing member 70 is provided, and a trunk through opening 41 is provided.

The rear wheel house 20 includes left and right rear wheel houses 20L and 20R. The rear wheel house 20 bulges inward in the width direction of the rear vehicle body structure 10 and is formed to open outward and downward in the width direction.
Further, the rear wheel houses 20L and 20R are connected to concave peripheral portions corresponding to the rear wheel houses 20L and 20R formed on the left and right portions of the floor panel 15 by spot welding, for example.

  The rear strut tower 25 is provided corresponding to the left and right rear wheel houses 20, and in this embodiment, for example, at the center position (rear axle center 10R) of the rear wheel house 20 in the front-rear direction of the rear vehicle body structure 10. It is formed adjacent to the inner position of the rear wheel house 20L, 20R in the width direction.

  In this embodiment, the seat back panel 40 includes left and right seat back side panels 40L and 40R and an upper wall portion 40A, and upper edges of the left and right seat back side panels 40L and 40R are connected to the upper wall portion 40A. It is formed in a substantially gate shape.

The left and right seat back side panels 40L, 40R are connected to the floor panel 15 at the lower edge by spot welding, for example, and the outer edge is the upper front of the left and right rear pillars 50 and the rear wheel house 20 (the side is also Each of which is erected to support the rear side of the seat.
The seat back panel 40 constitutes a sub panel of the reinforcing member 70.

  The seat back panel 40 is positioned on the front side of the trunk room 30 when the vehicle is assembled and functions as a partition wall that separates the living room from the trunk room 30, and the left and right seat back side panels 40L, 40R. The upper wall portion 40A and the opening 41 surrounded by the floor panel 15 constitute a trunk through.

  The rear pillar 50 is connected to the side portion of the floor panel 15, the peripheral portion of the rear wheel house 20, and the seat back panel 40 constituting the reinforcing member 70 by spot welding, for example.

  The upper back 60 is connected to the upper edge portion of the upper wall portion 40A of the seat back panel 40 by, for example, spot welding, and the left and right rear pillars 50 are connected to the upper back 60, and the upper wall portion of the seat back panel 40 is connected. 40 A and the left and right of the rear pillar 50 are bridged.

  The reinforcing member 70 includes a main panel 71 and a seat back panel (sub-panel) 40, and the main panel 71 is a recess of the seat back panel 40 formed in a gate shape, that is, the floor panel 15 has a seat back panel 40. Are connected to the seat back panel 40 and the floor panel 15 by using fastening means (not shown) such as bolts, for example.

  Further, as shown in FIG. 4, when the rear body structure 10 is viewed from the side, the reinforcing member 70 includes a surface including the reinforcing member 70 and the seat back panel 40 that is displaced from a surface including the left and right rear axle centers 10R. It is located in a direction and is spaced from the surface including the rear axle center 10R.

  Further, as shown in FIG. 5, the main panel 71 is formed by, for example, press-molding a steel plate whose outer shape is formed in a substantially rectangular shape. (Shape part) 73 is formed.

  In the first embodiment, the reinforcing convex portion 73 extends from the central portion toward the upper left portion, the first reinforcing convex portion 73A, the second reinforcing convex portion 73B extending toward the lower left portion, and the upper right portion. It has the 3rd reinforcement convex part 73C, the 4th reinforcement convex part 73D extended toward the corner | angular part of the lower right side, and the connection reinforcement convex part 73E of a center part.

The first reinforcing convex portion 73A, the second reinforcing convex portion 73B, the third reinforcing convex portion 73C, and the fourth reinforcing convex portion 73D are each formed with a predetermined constant width, and the first reinforcing convex portion 73A to the fourth reinforcing convex portion are formed. The convex portion 73D is connected by a connection reinforcing convex portion 73E, and is formed as a so-called tack.
The first reinforcing convex portion 73A to the fourth reinforcing convex portion 73D are preferably extended to the vicinity of the corner portion of the main panel 71 within a formable range when the main panel main body 72 is press-molded, for example. It is.

  According to the rear vehicle body structure 10 according to the first embodiment, since the reinforcing member 70 is connected to the left and right rear pillars 50 and the floor panel 15, the torsional rigidity of the vehicle body structure 1 can be improved.

  Further, according to the rear vehicle body structure 10, since the reinforcing member 70 is disposed in the opening 41 of the seat back panel 40, the torsional rigidity is improved while effectively utilizing the space without occupying the space of the trunk room 30. be able to.

  In addition, since the main panel 71 is attached to the seat back side panel 40 to constitute the reinforcing member 70, for example, the portion configured integrally with the rear vehicle body structure 10 is small, and the production of the vehicle body structure 1 is easy. The main panel 71 can be easily detached from the rear vehicle body structure 10. As a result, the vehicle can be assembled efficiently.

  Further, according to the rear vehicle body structure 10, it was confirmed that the torsional rigidity can be improved by 30% when the reinforcing member 70 is provided on the vehicle body without the reinforcing member.

  Instead of connecting the main panel 71 and the seat back panel 40 with bolts or the like, for example, they may be fixed by other welding means such as arc welding, or other fastening members such as rivets or bolts may be attached. It may be used and fixed mechanically.

Further, for example, instead of press-molding the reinforcing projections 73 on the main panel main body 72, for example, a separately formed reinforcing rib member or the like is connected to the steel plate constituting the main panel main body 72 by spot welding or arc welding. Alternatively, it may be attached using bolts, rivets or the like.
Moreover, the main reinforcement shape part may be formed by overlay welding and the main panel 71 may be comprised.
Moreover, you may provide the part from which the height from the main panel main body 72 differs in a part of reinforcement convex part 73. FIG.

  Further, instead of forming the first reinforcing convex portion 73A, the second reinforcing convex portion 73B, the third reinforcing convex portion 73C, and the fourth reinforcing convex portion 73D with a constant width, for example, the longitudinal direction of these reinforcing convex portions 73 The central side may be formed widely, and the shapes of the first reinforcing convex portion 73A, the second reinforcing convex portion 73B, the third reinforcing convex portion 73C, and the fourth reinforcing convex portion 73D can be appropriately set.

Further, instead of connecting the left and right rear pillars 50 by the upper back 60, for example, the left and right rear pillars 50 may be connected by other rear cross members, or the left and right rear pillars 50 may not be connected.
Alternatively, a seat back panel in which the left and right seat back side panels 40L and 40R are not connected by the upper wall portion 40A may be used.

Next, a second embodiment of the present invention will be described with reference to FIG.
The second embodiment differs from the first embodiment in that the main panel 75 includes a first auxiliary reinforcing shape portion 76A and a second auxiliary reinforcing shape portion 76B in addition to the reinforcing convex portion 73. Is a point.
The first auxiliary reinforcing shape portion 76A is formed in a substantially oval shape along the vehicle body width direction and is disposed on the upper side and the lower side of the reinforcing convex portion 73, and the second auxiliary reinforcing shape portion 76B is formed in the vehicle body height direction. And are disposed on the left side and the right side of the reinforcing projection 73.
Since others are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

In addition, it is good also as a structure provided with either one of the 1st auxiliary | assistant reinforcement shape part 76A and the 2nd auxiliary | assistant reinforcement shape part 76B, for example, the 1st auxiliary | assistant reinforcement shape part 76A is either one of the upper and lower sides of the reinforcement convex part 73. You may provide only in one side.
In addition, one or both of the first auxiliary reinforcing shape portion 76A and the second auxiliary reinforcing shape portion 76B has a shape other than an oval shape, for example, a shape similar to the shape of the main panel main body 72 excluding the reinforcing convex portion 73. Or it may be a trapezoid.
The rear vehicle body structure 11 is excellent in terms of torsional rigidity.

Next, a third embodiment of the present invention will be described with reference to FIG.
The third embodiment differs from the first embodiment in that the main panel 77 is composed of a first reinforcing convex portion 73A, a second reinforcing convex portion 73B, a third reinforcing convex portion 73C, and a fourth reinforcing convex portion 73D. The main reinforcing shape portion 78 is provided, and the connection reinforcing convex portion 73E is not provided.
Since others are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.
The main panel 77 may be provided with one or both of the first auxiliary reinforcing shape portion 76A and the second auxiliary reinforcing shape portion 76B according to the second embodiment.
The rear body structure 11 is excellent in that the natural frequency can be adjusted.

  Next, with reference to FIG. 8, the modification of the attachment position of the reinforcement member regarding the 1st to 3rd embodiment of this invention is demonstrated.

First, a first modification will be described with reference to FIG.
The rear vehicle body structure 11 according to the first modification includes a reinforcing member 80.
The reinforcing member 80 includes a main panel (not shown) and, for example, a sub panel (not shown) formed in a frame shape in which an opening to which the main panel can be attached is formed at a substantially central portion. It is attached to the opening of this by bolts or the like. (Hereinafter, the same applies to the second to third modifications.)

The first modification differs from the first embodiment in that the lower part of the reinforcing member 80 is connected to the floor panel 15 between the seat back panel 40 and the rear strut tower 25, and the upper part is the seat back panel 40. The rear strut tower 25 is connected to the upper back 60 and is provided with the upper side directed rearward.
Since others are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.
The rear vehicle body structure 11 is excellent in that it prevents out-of-plane deformation of the reinforcing member and further increases torsional rigidity.

Next, a third modification will be described with reference to FIG.
The rear vehicle body structure 13 according to the third modification includes a reinforcing member 90.
The third modified example is different from the first embodiment in that the lower part of the reinforcing member 90 is connected to the floor panel 15 at the rear of the rear strut tower 25 and the upper part is at the front of the rear strut tower 25. It is connected to the back 60. The reinforcing member 90 is provided with the upper side facing forward, and the surface including the reinforcing member 90 intersects with the surface including the rear axle center 10R. Since others are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.
The rear vehicle body structure 13 is excellent in that the load from the strut is efficiently transmitted to the rear pillar.

In the fourth to seventh embodiments, the case where the reinforcing members 80, 85, 90, and 95 are provided with the sub panel and are connected to the rear pillar 50 and the like through the sub panel has been described. 85, 90, and 95 may be configured to be directly connected to the floor panel 15, the rear pillar 50, and the like using a bracket or the like that is configured from a single panel and provided at a location corresponding to the connecting portion.
With this configuration, the torsional rigidity of the vehicle body structure 1 can be greatly improved.

Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.
For example, in the above-described embodiment, the case where the vehicle body is formed of high-strength steel has been described, but part or all of the vehicle body structure may be formed of a material other than high-strength steel.

  Moreover, although the case where the whole vehicle body structure 1 consists of a monocoque body was demonstrated, you may apply to other vehicle body structures, such as having a frame structure in part, for example.

Moreover, in the said embodiment, although the case where the rear strut tower 25 was provided adjacent to the inner side of the rear wheel house 20 was demonstrated, the rear strut tower 25 is the upper side of the rear wheel house 20, for example, a rear wheel house. It may be formed inside or behind 20.
Further, it goes without saying that the rear vehicle body structures 10, 11, 12, 13, and 14 according to the present invention can be applied not only to automobiles equipped with an internal combustion engine, but also to hybrid cars, electric cars provided with electric motors on each wheel, and the like. Absent.

  Since the torsional rigidity of the automobile body structure can be improved efficiently, it can be used industrially.

DESCRIPTION OF SYMBOLS 1 Body structure 10 Rear body structure 10R Rear axle center 15 Floor panel 20 Rear wheel house 25 Rear strut tower (strut tower)
30 Trunk room 40 Seat back panel (sub-panel)
40A Upper wall (sub-panel)
40L, 40R Seat back side panel (sub panel)
50 Rear pillar 60 Upper back 70, 80, 85, 90, 95 Reinforcement member 71 Main panel 73 Reinforcement convex part (main reinforcement shape part)
73A, 73B, 73C, 73D, 73E Reinforcement convex part (main reinforcement shape part)
76A First auxiliary reinforcing shape portion 76B Second auxiliary reinforcing shape portion

Claims (5)

Floor panels,
Rear wheel houses formed on left and right portions of the floor panel;
A strut tower provided corresponding to the rear wheel house;
A rear vehicle body structure including a side pillar of the floor panel and a rear pillar connected to the rear wheel house,
A reinforcing member for connecting the floor panel and each of the rear pillars to each other;
The reinforcing member is
A rear vehicle body structure comprising a main reinforcing shape portion extending from the center toward the upper left portion, the lower left portion, the upper right portion, and the lower right portion when viewed from the rear of the vehicle body. The rear vehicle body structure according to claim 1,
The reinforcing member is
A main panel on which the main reinforcing shape portion is formed;
A rear vehicle body structure comprising: a pair of sub-panels having one end connected to the outer side in the vehicle width direction of the main panel and the other end erected and connected to the inner side in the vehicle width direction of the rear pillar. A rear vehicle body structure according to claim 1 or claim 2,
The rear vehicle body structure is characterized in that the left and right sides of the rear pillar are connected above the reinforcing member. The rear vehicle body structure according to claim 2 or claim 3,
A rear vehicle body structure, wherein the sub panel is a seat back side panel. The rear vehicle body structure according to any one of claims 1 to 4,
The reinforcing member is
A rear vehicle body comprising at least one of a first auxiliary reinforcing shape portion formed in the vehicle body width direction and a second auxiliary reinforcing shape portion formed in the vehicle body height direction in addition to the main reinforcing shape portion. Construction.

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