JP2004114789A - Vehicle body structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body structure for enhancing vehicle body rigidity to improve driving stability and ride comfort performance and securing a sufficiently extensive cabin space without increasing vehicle body weight to a suspension input. <P>SOLUTION: In the vehicle body structure in which a trailing arm 16 of a rear suspension SP having the trailing arm 16 is supported by a rear frame 10, a bush member 21 disposed on the connection part of the trailing arm 16 to the rear frame 10 is fitted to the rear frame 10 while facing the inside of an opening 17 or a recess 14 formed in the rear frame 10. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle body structure, and more particularly to a vehicle body structure of a portion that supports a trailing arm of a suspension.
[0002]
[Prior art]
Conventionally, a vehicle body structure as shown in FIG. 11 has been employed for supporting a trailing arm of a suspension to a vehicle body via a bush member (see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-153778
In FIG. 11, a side member 2 is joined to a lower portion of the floor panel 1 along the vehicle front-rear direction to form a closed section structure H on the lower surface of the floor panel 1. A cross member 3 is joined to the side member 2, and a bracket 4 extending downward is joined to a lower surface of the cross member 3, while a bracket 5 extending downward is joined to a side wall of the side member 2 outside the vehicle compartment. I have. A bolt member 8 of a bush member 7 attached to the tip of the trailing arm 6 of the suspension is fastened and fixed between the brackets 4 and 5.
Therefore, the input load from the trailing arm 6 is reliably supported by the side member 2 in a state where road noise and the like are suppressed by the buffering action of the bush member 7.
[0005]
[Problems to be solved by the invention]
The above-described conventional vehicle body structure is excellent in that the input load from the suspension acting from the trailing arm 6 can be supported by the closed-section structure portion H which is advantageous in terms of strength and rigidity. Is located below the side member 2, the moment acting on the side member 2 from the trailing arm 6 of the suspension, especially the moment in the vehicle longitudinal direction and the vehicle width direction, is a load input point. Becomes larger by the amount located below the side member 2 and acts on the side member 2.
[0006]
Therefore, in consideration of this, it is necessary to increase the size of the brackets 4 and 5, increase the thickness of the brackets 4 and 5, and increase the thickness of the side members 2. There is.
In addition, since the brackets 4 and 5 are arranged below the side members 2, the height of the floor panel 1 above the ground increases, and there is a problem that the interior space of the vehicle becomes narrower.
Therefore, the present invention provides a vehicle body structure capable of increasing the rigidity of the vehicle body without increasing the weight of the vehicle body with respect to a suspension input, improving the operability and the riding comfort performance, and securing a sufficiently large cabin space. .
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention described in claim 1 is directed to a suspension (for example, a rear suspension SP in the embodiment) having a trailing arm (for example, the trailing arm 16 in the embodiment). In a vehicle body structure supported by a vehicle body frame (for example, the rear frame 10 in the embodiment), a bush member (for example, the bush member 21 in the embodiment) disposed at a connection portion between the trailing arm and the vehicle body frame is connected to the vehicle body. It is characterized in that it is attached to the vehicle body frame in a state of being provided in an opening (for example, the opening 17 in the embodiment) or a recess (for example, the recess 14 in the embodiment) formed in the frame.
With such a configuration, it is possible to minimize the moment acting on the vehicle body frame with respect to the input load from the suspension.
[0008]
The invention described in claim 2 is characterized in that the vehicle body frame is a vehicle body skeleton member (for example, the rear frame 10 in the embodiment) that is disposed in the front-rear direction of the vehicle body side portion and forms a closed-section structure portion.
With this configuration, it is possible to reliably support the input load from the suspension by sharing the load with the entire vehicle body.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the front of the vehicle body is indicated by an arrow FR, the rear is indicated by RR, and the direction of the cabin is indicated by CTR.
1 and 2, reference numeral 10 denotes a rear frame (body frame) disposed on both sides of the rear of the vehicle body in the front-rear direction of the vehicle body. The rear frame 10 is a member having a substantially U-shaped cross section that is open at the top, and a flange portion 10b to which a floor panel 11 is attached is formed at the upper edge of both side walls 10a, 10a, and is joined to the floor panel 11 to form a closed cross section. It is a vehicle body skeleton member that forms the structural portion H.
[0010]
The rear frame 10 curves slightly downward toward the front of the vehicle body, and is formed to have a shape in which a part of the rear frame 10 widens in the vicinity of the side sill 12 mounting portion shown in FIG. A lower bottom wall 10d is formed in which the bottom wall 10c is further lowered. Note that a stiffener 25 as a reinforcing member is joined to the inner wall of the widened portion 13.
[0011]
As shown in FIG. 3, a recess 14 is formed in the vicinity of the side sill 12 mounting portion of the rear frame 10 from the back surface of the bottom wall 10 c, and the front portion is inclined with respect to the bottom wall 10 c when viewed from the upper surface side of the bottom wall 10 c. A bulging portion 15 is formed so as to extend substantially horizontally. The recess 14 supports a tip portion of a trailing arm 16 described later. An opening 17 is formed in the upper wall 15a of the bulging portion 15. A front bolt insertion hole 18 is formed in the bottom wall 10 c on the front side of the opening 17. A rear bolt insertion hole 19 is also formed in the bottom wall 10c on the rear side of the opening 17.
[0012]
As shown in FIGS. 4 and 5, a lid 20 is attached around the opening 17 so as to surround it. The lid 20 has a flange portion 20a which rises at the top and is joined to the bottom wall 10c of the rear frame 10 around the periphery, and closes the opening 17 to prevent water and dust from entering and to reinforce the opening 17. And a member for securing an escape space above the bush member 21 which is disposed below the opening 17.
[0013]
A front bracket 22 is attached to a position corresponding to the front bolt insertion hole 18 on the front side of the attachment portion of the lid 20. An insertion hole 23 is provided in the upper wall 22a of the front bracket 22 at a position corresponding to the front bolt insertion hole 18, and a front nut member 24 is fixed here. The front nut member 24 has a flange portion 24 a at an upper portion, and is interposed between the upper wall 22 a of the front bracket 22 and the bottom wall 10 c of the rear frame 10.
[0014]
A flange portion 22c is provided from the lower edge of the front wall 22b of the front bracket 22 to the rear edge of the upper wall 22a, and a side wall 22d is provided outside the vehicle compartment. The front side is joined to the bottom wall 10c of the rear frame 10, the rear side is joined to the front wall 22b of the lid 20, the outside of the cabin of the side wall 22d is joined to the side wall of the stiffener 25, and the load applied to the front nut member 24 is It can be distributed. In FIG. 5, reference numeral 26 denotes a reinforce joined to the bottom wall 10c of the rear frame 10 below the front nut member 24, and 12 denotes a side sill.
[0015]
As shown in FIGS. 4 and 6, a rear bracket 27 is mounted at a position corresponding to the rear bolt insertion hole 19 on the rear side of the mounting portion of the lid 20. The upper wall 27a of the rear bracket 27 is provided with an insertion hole 27c at a position corresponding to the rear bolt insertion hole 19, and the rear nut member 28 is inserted into the insertion hole 27c. The rear nut member 28 has a flange portion 28a at a lower portion, and is supported by a bottom wall 10c of the rear frame 10.
A flange portion 27b is formed on the front side of the rear bracket 27, on the vehicle interior side, and on the vehicle exterior side, and is joined to the upper wall 20b of the lid 20 and the bottom wall 10c of the rear frame 10, respectively. In FIG. 6, reference numeral 29 denotes a reinforce joined to the bottom wall 10c of the rear frame 10 below the rear nut member 28, 32 denotes a stiffener joined to the flange portion 10b of the rear frame 10, and 12 denotes a side sill.
[0016]
As shown in FIGS. 3 and 7, the upper end of the rear frame 10 projects downward from the opening 17 in the recess 14 on the lower surface of the rear wall 10, that is, in the recess 14 on the lower surface of the bottom wall 10c. A bush member (indicated by a chain line in FIG. 7) 21 at the tip of the trailing arm 16 is provided.
6, the stiffener 32 is joined to the flange portion 10b of the rear frame 10 and the upper wall 20c of the lid 20.
[0017]
1 and 2, SP indicates a rear suspension. The rear suspension SP has an upper arm UA, a lower arm LA, a damper D, and a coil spring S, and the upper arm UA and the lower arm LA are supported by a rear cross beam. The rear suspension SP has a trailing arm 16.
[0018]
As shown in FIGS. 8 and 9, the trailing arm 16 has a bifurcated base 16a supported by the rear suspension SP, and a tip 16b extending toward the front of the vehicle body and attached to the vehicle body. Has a bush member 21 attached thereto. The bush member 21 has a metal outer cylinder 21b attached around a cylindrical buffer part 21a made of rubber or the like, and a metal inner cylinder 21c is inserted through the center of the buffer part 21a.
[0019]
As shown in FIG. 10, a bolt member 30 is inserted into the inner cylinder 21 c of the bush member 21, and both ends of the bolt member 30 are fastened and fixed to side walls 31 a of the arm bracket 31 by nuts (not shown). As shown in FIG. 2, the arm bracket 31 has a relief hole 31b for the bush member 21, a front mounting portion 31c and a rear mounting portion 31d, and the bolt member 30 inserted through the inner cylinder 21c of the bush member 21. Side wall 31a that supports both ends of the rear frame 10 and is disposed on the back surface of the bottom wall 10c along the bottom wall 10c of the rear frame 10. The front mounting portion 31c and the rear mounting portion 31d are The front nut member 24 and the rear nut member 28 are fastened and fixed by bolts 33, 33. In FIG. 10, the stiffener 25 is omitted for convenience of illustration.
Therefore, the bush member 21 is disposed so as to face the closed section structure H of the rear frame 10, and the bolt member 30 for fixing the bush member 21 is disposed at the same position as the bottom wall 10 c of the rear frame 10. It will be.
[0020]
According to the above-described embodiment, the bush member 21 disposed at the connection portion between the trailing arm 16 and the rear frame 10 faces the opening 17 formed in the rear frame 10 and the bottom of the rear frame 10. Since the bush member 21, ie, the support position of the trailing arm 16 is closer to the inside of the closed cross-section structure portion H of the rear frame 10, it is mounted on the wall 10 c via the arm bracket 31 so as to be sunk into the rear suspension SP. , The moment acting on the rear frame 10, especially the moment in the vehicle longitudinal direction and the vehicle width direction, can be minimized.
[0021]
Accordingly, the rigidity of the vehicle body can be improved while reducing the weight of the vehicle body without increasing the thickness of the peripheral members such as the front bracket 22, the rear bracket 27, the arm bracket 31, and the like, and the rear frame 10. As a result, the toughness and camber change due to insufficient rigidity of the vehicle body are eliminated, and the compliance performance as set by the bush member 21 is exhibited by the amount of the rigidity of the vehicle body being improved, thereby improving the operability and the riding comfort performance. Can be.
In addition, compared to the conventional structure in which the bush member 21 is arranged below the rear frame 10, the arrangement position of the bush member 21 can be set higher, thereby improving the operability and the riding comfort, while keeping the height above the ground low. The vehicle interior space can be secured sufficiently wide.
[0022]
Further, since the rear frame 10 is a vehicle body skeleton member which is disposed in the front-rear direction of the vehicle body side portion and forms the closed cross-section structure portion H, the input load from the suspension is shared by the entire vehicle body and securely supported. Therefore, the maneuverability and the riding comfort performance can be further improved.
[0023]
In this vehicle body structure, due to the nature of the trailing arm 16, a force pulling backward acts on the bush member 21 of the trailing arm 16, but the rearward load applied to the front nut member 24 is reduced by the front bracket. 22 acts on the front wall 20b of the lid 20 in a direction substantially perpendicular to the front wall 20b of the lid 20 from the flange 22c at the rear edge of the upper wall 22a, and is advantageous in strength to other flanges 22c of the upper wall 22a of the front bracket 22. Since the force acts in the shearing direction, the support rigidity against the load on the rear side can be reliably increased even at this portion. The same is true for the rear bracket 27, and since the front side, the vehicle interior side, and the vehicle exterior side flange portions 27b have a structure in which a force acts in a shear direction that is advantageous in terms of strength, the support rigidity is increased. Can be.
[0024]
The present invention is not limited to the above-described embodiment. For example, instead of forming the opening 17, the lid 20 is abolished and the concave portion 14 is formed in a shape that is largely concave from the back side of the bottom wall 10c of the rear frame 10. You may. The bush member 21 is supported by the rear frame 10 as an example, but may be applied to a case where the bush member 21 is attached to a side frame or the like as long as it is a body frame.
[0025]
【The invention's effect】
As described above, according to the first aspect of the invention, it is possible to minimize the moment acting on the vehicle body frame with respect to the input load from the suspension. There is an effect that the rigidity of the vehicle body can be increased and the operability and the riding comfort performance can be improved without increasing the thickness of the frame or the like. In addition, when the bush member is arranged at the lower portion of the body frame, the height of the arrangement of the bush member is increased, so that the operability and the riding comfort are improved, while the height above the ground can be kept low, and the cabin space can be reduced. Has the effect of being able to ensure a sufficiently wide range.
[0026]
According to the second aspect of the invention, since the input load from the suspension can be shared and securely supported by the entire vehicle body, the steering performance and the riding comfort performance can be further improved. There is.
[Brief description of the drawings]
FIG. 1 is a perspective view of a rear left portion of a vehicle body according to an embodiment of the present invention.
FIG. 2 is a rear view of the rear left portion of the vehicle body according to the embodiment of the present invention.
FIG. 3 is an enlarged perspective view of a main part of the rear frame of FIG. 1;
FIG. 4 is an enlarged view of a main part of FIG. 1;
FIG. 5 is a sectional view taken along line AA of FIG. 4;
FIG. 6 is a sectional view taken along line BB of FIG. 4;
FIG. 7 is a sectional view taken along line CC of FIG. 4;
FIG. 8 is a plan view of the trailing arm according to the embodiment of the present invention.
FIG. 9 is a side view of FIG.
FIG. 10 is a sectional view taken along line DD in FIG. 4;
FIG. 11 is a sectional view of a conventional technique.
[Explanation of symbols]
10. Rear frame (body frame, body frame member)
14 recess 16 trailing arm 17 opening 21 bush member SP rear suspension (suspension)

Claims (2)

In the vehicle body structure in which the trailing arm of the suspension having the trailing arm is supported by the vehicle body frame, a bush member disposed at a connection portion between the trailing arm and the vehicle body frame includes an opening formed in the vehicle body frame or A vehicle body structure, wherein the vehicle body structure is attached to a vehicle body frame in a state where the vehicle body is provided in a concave portion. The vehicle body structure according to claim 1, wherein the vehicle body frame is a vehicle body skeleton member that is arranged in a front-rear direction of a vehicle body side part and forms a closed cross-section structure part.

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