JPH0656051A - Car body structure - Google Patents

Abstract

PURPOSE:To increase rigidity of a suspension mounting part without improving rigidity of a frame. CONSTITUTION:An end part 32A of a lower arm 32 of a front suspension 30 is rotatably supported to a main unit 36 of a lower arm bracket 34 fixed to a side rail 12. One end part 44A of a brace rod 44 as a connecting member is connected to a body rear side wall part 36C of the supporting part 36, and the other end part 44B of the brace rod 44 is connected to a body front side wall part 20C of a body mount bracket 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body structure, and more particularly to a vehicle body structure including a frame and a body.

[0002]

2. Description of the Related Art Conventionally, a vehicle body structure of a box-type large vehicle such as a bus includes a frame to which a suspension arm and the like are attached, and a body body connected to an upper portion of the frame. Moreover, the frame structure is the actual Kaihei 1-10.
It is similar to the vehicle body frame shown in 1981.

That is, as shown in FIG. 5, the frame 70 has a ladder shape in which a large number of cross members 74, mounting brackets 76 and the like are welded and fixed to side rails 72 provided on both left and right sides. A coil spring support bracket 78 that supports the coil spring of the suspension is fixed to the side rail 72.

[0004]

However, in this vehicle body structure, the suspension is supported only by the coil spring support bracket 78 provided on the frame 70, and the suspension is input through the coil spring support bracket 78. The load applied is supported by the frame 70.

On the other hand, in the body structure of a box-type large vehicle such as a bus, the rigidity of the frame is generally lower than the rigidity of the main body of the body, and the rigidity of the whole body is a predetermined value mainly depending on the rigidity of the main body. Is set to.

Therefore, in this vehicle body structure in which the suspension is supported only by the coil spring supporting bracket 78 fixed to the frame 70, the rigidity of the suspension mounting portion is low, and in order to improve this rigidity, the rigidity of the frame is improved. Need to let.

In view of the above facts, an object of the present invention is to obtain a vehicle body structure capable of increasing the rigidity of the suspension mounting portion without improving the rigidity of the frame.

[0008]

According to the vehicle body structure of the invention described in claim 1, a suspension arm is attached to the frame through a suspension arm bracket, and a body is coupled to an upper portion of the frame via a body mount bracket. A vehicle body structure including a main body is characterized in that a connecting member for connecting the suspension arm bracket and the body mount bracket is provided.

[0009]

In the vehicle body structure according to the first aspect of the present invention, the load input to the suspension arm is input to the body main body, which has a higher rigidity than the frame, via the suspension arm bracket, the connecting member and the body mount bracket. Therefore, compared with the conventional vehicle body structure that supports the suspension only with the suspension arm brackets fixed to the frame, the rigidity of the suspension attachment portion can be increased without increasing the rigidity of the frame. Also, before connecting the frame and the body itself,
Since the suspension arm bracket and the body mount bracket can be connected by the connecting member, it is not necessary to review the assembly process of the frame and the body.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle body structure according to the present invention will be described with reference to FIGS.

In the figure, an arrow FR indicates the front direction of the vehicle body, an arrow IN indicates the inner side direction of the vehicle, and an arrow UP indicates the upper direction of the vehicle body.

As shown in FIGS. 3 (A) and 3 (B), the vehicle body of this embodiment is a vehicle body 10 of a bus, and includes a frame 11 and a body 14 connected to the upper portion of the frame 11. It is composed of.

As shown in FIG. 2A, the frame 11
Is formed into a ladder shape by a pair of side rails 12 provided on both left and right sides and extending in the front-rear direction of the vehicle body, and a large number of cross members 18 installed on these side rails 12. A body mount bracket 20 is welded to the side rail 12 at a predetermined interval in the front-rear direction of the vehicle body and serves as a connecting portion with the body body 14.

As shown in FIGS. 3 (A) and 3 (B), the body 14 has a box shape with the opening facing downward, and the lower end portions of the vehicle body side surfaces 14A, 14B are respectively formed in the vehicle. Body cross member 22 extending in the width direction
Are connected by. The body cross members 22 are arranged at a predetermined interval in the front-rear direction of the vehicle body, and
The cross-sectional deformation of the opening is prevented, and the rigidity of the body 14 is ladder-shaped and is about nine times that of the frame 11.

The body cross member 22 of the body 14 is the body mount bracket 2 of the frame 11.
No. 0 (see FIG. 2A) is rigidly connected with bolts and nuts.

As shown in FIGS. 2 (A) and 2 (B), the frame 11 is provided with undercarriage parts such as the front suspension 30 and the engine 31.

As shown in FIG. 1, an end portion 32A of a lower arm 32 of the front suspension 30 is rotatably supported by a lower arm bracket 34 as a suspension arm bracket fixed to the side rail 12.

As shown in FIG. 4, the lower arm bracket 34 is composed of a main body 36 and a reinforcing portion 38 composed of a first auxiliary member 38A, a second auxiliary member 38B and a third auxiliary member 38C. Is formed by connecting four plate materials.

The main body 36 has a U-shaped cross-section viewed from the vehicle width direction with its opening facing downward. The base portion 36A of the main body 36 is welded to the lower surface 12A (see FIG. 1) of the side rail 12 with the third auxiliary member 38C interposed therebetween, and the welding length is earned by the third auxiliary member 38C. Also,
The main body 36 extends inward in the vehicle width direction and projects from the side rails 12 inward in the vehicle width direction. As shown in FIG. 1, a bolt 40 penetrates substantially parallel to the side rail 12 on both side wall portions 36B and 36C of the projecting portion, and the end portion 3 of the lower arm 32 is attached to the bolt 40.
2A is pivotally supported.

As shown in FIG. 1, the first auxiliary member 38A
Is located between a portion of the support portion 36 projecting inward in the vehicle width direction from below the side rails 12 and an inner side surface 12B of the side rails 12 in the vehicle width direction. And receives a force in a direction orthogonal to the axial direction of the side rail 12 (direction of arrow F in FIG. 1). A second auxiliary member 38B is welded between the first auxiliary member 38A and the vehicle width direction inner side surface 12B of the side rail 12. This second auxiliary member 38B
A flange welded to the vehicle width direction inner side surface 12B of the side rail 12 is formed on the front and rear of the vehicle body so as to receive a force in the axial direction of the side rail 12 (direction of arrow F in FIG. 1). It has become.

The first auxiliary member 38A has a lightening hole 4
2 is drilled. Below the side rails 12, the vertical width of both side wall portions 36B and 36C of the support portion 36 is gradually narrowed, and a brace rod as a connecting member is provided near the vehicle width direction outer end portion of the vehicle body rear side wall portion 36C. One end 44A of 44 is joined by a bolt 46. The brace rod 44 is made of a straight pipe material, and both end portions 44A and 44B have a flat plate shape, and a through hole for coupling (not shown) is bored in these flat plate portions. There is.

On the other hand, the body mount bracket 20 is
The cross-sectional shape viewed from the vehicle width direction is U-shaped with the opening facing downward, and the flange 20B extending inward in the vehicle width direction from the vehicle width direction inner end of the base 20A is the side. It is welded to the upper surface 12C of the rail 12. Further, the inner side portions in the vehicle width direction of the side wall portions 20C and 20D are provided along the vehicle width direction inner side surface 12B of the side rail 12 so as to extend downward and form leg portions 20E and 20F. A flange 20G is formed toward the front of the vehicle body at a contact portion of the leg portion 20E with the vehicle width direction outer side surface 12D of the side rail 12, and the flange 20G is formed on the vehicle width direction outer side surface 12D of the side rail 12. It is welded. In addition, a flange 20H is formed toward the rear of the vehicle body at a contact portion of the leg portion 20F with the outer surface 12D of the side rail 12 in the vehicle width direction. This flange 20H is an outer surface of the side rail 12 in the vehicle width direction. It is welded to 12D.

The vertical widths of both side wall portions 20C and 20D of the body mount bracket 20 are gradually narrowed toward the outer side in the vehicle width direction, and the vehicle body front side wall portion of the body mount bracket 20 provided near the lower arm bracket 34. The other end 44B of the brace rod 44 is connected by a bolt 50 near the outer end of the vehicle 20C in the vehicle width direction. The base 2 of the body mount bracket 20
A through hole 52 for coupling with the body cross member 22 is formed in 0A.

Next, the operation of this embodiment will be described.
In the vehicle body structure of this embodiment, the front suspension 30
The load input to the lower arm 32 is input to the body cross member 22 of the body main body 14 having higher rigidity than the frame 11 via the suspension arm bracket 34, the brace rod 44, and the body mount bracket 20.

Therefore, the rigidity of the mounting portion of the lower arm 32 of the front suspension 30 can be increased without increasing the rigidity of the frame 11 as compared with the conventional vehicle body structure that supports the suspension with only the suspension arm bracket fixed to the frame. It can be higher, which improves steering stability. In this embodiment, since the suspension arm bracket 34 and the nearby body mount bracket 20 are connected by the brace rod 44, the brace rod 44 can be linear.
As a result, the target rigidity of the brace rod 44 can be easily obtained, and sufficient buckling strength can be obtained.

Before connecting the frame 11 and the body 14 to each other, the suspension arm bracket 34 and the body mount bracket 20 can be connected by the brace rod 44, so that the frame 11 and the body 14 are assembled. It is not necessary to review the attachment process. Further, the present embodiment can be performed only by changing the structure of the frame side of the conventional vehicle body, and does not need to change the body side.

In this embodiment, the brace rod 44
Both end portions 44A and 44B of the brace rod 44 are connected to the lower arm bracket 34 and the body mount bracket 20 by bolts 46 and 50, respectively.
4 and the body mount bracket 20 are not limited to bolts, and other joining methods such as rivets and welding may be used. Further, the connecting method between the end portion 44A of the brace rod 44 and the lower arm bracket 34 and the connecting method between the end portion 44B of the brace rod 44 and the body mount bracket 20 may be different.

In this embodiment, the brace rod 44
Although both ends 44A and 44B are made of a pipe material having a flat plate shape, the constituent members of the brace rod 44 are not limited to this, and may be a square material, a plate material, or the like. Further, although an example in which the present invention is applied to the front suspension has been described in the present embodiment, the present invention can also be applied to the rear suspension.

[0029]

The present invention is a vehicle body structure including a frame to which a suspension arm is attached via a suspension arm bracket, and a body body connected to an upper portion of the frame via a body mount bracket. Since the connecting member for connecting the body mounting bracket and the body mounting bracket is provided, the rigidity of the suspension mounting portion can be increased without increasing the rigidity of the frame.
Since the suspension arm bracket and the body mount bracket can be connected by the connecting member before connecting the frame and the body body, it is not necessary to review the assembly process of the frame and body body. Have.

[Brief description of drawings]

FIG. 1 is a perspective view showing a vehicle body structure of an embodiment of the present invention as seen from an obliquely rearward inside of a vehicle body.

FIG. 2A is a plan view showing a frame of a vehicle body structure according to an embodiment of the present invention, and FIG. 2B is a side view showing a frame of a vehicle body structure according to an embodiment of the present invention.

FIG. 3A is a plan view showing a vehicle body structure of one embodiment of the present invention, and FIG. 3B is a side view showing a vehicle body structure of one embodiment of the present invention.

FIG. 4 is a perspective view showing a lower arm bracket of a vehicle body structure according to an embodiment of the present invention.

FIG. 5 is a perspective view showing a frame of a conventional vehicle body structure as seen obliquely from the front of the vehicle body.

[Explanation of symbols]

10 Body 11 Frame 12 Side Rail 14 Body Body 20 Body Mount Bracket 22 Body Cross Member 30 Front Suspension 32 Lower Arm 34 Lower Arm Bracket (Suspension Arm Bracket) 44 Brace Rod (Connecting Member) 46 Bolt 50 Bolt

Claims (1)

[Claims] 1. A vehicle body structure comprising a frame to which a suspension arm is attached via a suspension arm bracket, and a body body coupled to an upper portion of the frame via a body mount bracket, wherein the suspension arm bracket and the A vehicle body structure including a connecting member for connecting a body mount bracket.