JPH10338169A - Suspension arm fitting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fit a lower arm easily to a frame. SOLUTION: A sub-frame 12 is disposed in the lateral direction of a body, below a main frame. The sub-frame 12 is provided with through holes 14 for inserting bolts 13 to fix the sub-frame 12 to the body side. The through hole 14 has an inner diameter sufficiently larger than the diameter of the bolt 13. At the time of fitting a bush part 1a of a lower arm 1, the sub-frame 12 is temporarily fastened to the body side in advance so that the lower arm 1 is slightly movable, and after adjusting the lower arm 1 to the position of the bush part 1a, the sub-frame 12 is properly fastened to the body side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of a suspension arm for suspending a frame and a tire of an automobile.

[0002]

2. Description of the Related Art FIG. 5 shows a position where an A-shaped lower arm 1 of a front suspension portion is mounted. The lower arm 1 suspends the tire 2 and the frame 3, and the frame 3 is attached to a main frame or a sub-frame. FIG. 6 shows a mounting portion between the lower arm 1 and the frame 3. As shown in the figure, frame 3
The lower arm mounting brackets 4 and 5 are fixed by welding. The lower arm 1 has bush portions 1a and 1b interposed between the projecting pieces of the lower arm brackets 4 and 5, and a bolt 6 and a nut 7 are attached by screwing as shown in FIG.

As shown in FIG. 6, since the mounting brackets 4 and 5 of the lower arm 1 are each welded to the frame 3 as described above, the mounting brackets 4 and 5 indicated by L1 due to heat or the like. It is difficult to get the exact length between them. Further, the lower arm 1 side also includes the bush portions 1a, 1b.
A separate component such as a bush is press-fitted into the hole, and it is difficult to obtain an accurate dimension having a length indicated by L2. Therefore, when attaching the mounting brackets 4 and 5 and the bush parts 1a and 1b,
A gap s is provided so that they can be easily attached even if some dimensional deviation occurs.

[0004]

However, when the mounting brackets 4 and 5 and the bush portions 1a and 1b are tightened with the bolts 6, the mounting brackets 4 and 5 are also tightened by the gap s. Deformation and tightening torque also require a large force. Further, even after the lower arm 1 is mounted, loosening of the bolt 6 and the nut 7 and generation of internal stress of the mounting brackets 4 and 5 become problems. Further, as shown in FIG.
And point b of rack and pinion of steering
The dimensional error between them also increases, and the accuracy of alignment decreases. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and allows a lower arm to be easily mounted without providing the gap s, and a lower arm mounting bracket to which a lower arm can be mounted without being deformed. The purpose is to provide a structure.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises a pair of main frames arranged in the front-rear direction of a vehicle body and a sub-frame arranged laterally on the front side of the main frames. In a suspension arm mounting structure including a frame, a lower arm for suspending the frame and the wheels, and a bush portion being mounted on a mounting bracket for each of the main frame and the subframe, the subframe is attached to the mainframe. On the other hand, when the lower arm is mounted, the bush portion on the main frame side is fixed in advance, and when the bush portion on the sub-frame side is fixed,
The position of the sub-frame is adjusted in the front-rear direction, and the bush portion is mounted.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A suspension arm mounting structure according to an embodiment of the present invention will be described below with reference to the drawings. Note that the same parts as those in the related art are described with the same reference numerals. The main frame 11 shown in FIG. 1 is for mounting the body of an automobile, is provided one for each on the left and right, and extends in the front-rear direction of the automobile. FIG. 1 shows only the front side of the main frame 11. On the main frame 11, a sub-frame 12 arranged in the lateral direction of the vehicle body is fixed to the vehicle body such as the main frame 11. A-shaped lower arm 1 for suspension
Is provided at one end with a ball joint 1c which is a mounting point on the tire side (not shown). The other end is bifurcated in the fore-and-aft direction, and the front bush portion 1a is fixed to the subframe 12, and the rear bush portion 1b is fixed to the main frame 11.

FIG. 2 shows one end of the subframe 12. As shown in the drawing, a mounting bracket 12a of the bush portion 1a of the lower arm 1 is fixed to the sub-frame 12 by welding. In addition, the subframe 12 includes FIG.
As shown in FIG. 1, a through hole 14 for inserting a bolt 13 is provided for fixing the bolt to the vehicle body. As shown in the drawing, the hole diameter of the through hole 14 has an inner diameter sufficiently larger than the hole diameter of the bolt hole 11 b provided in the main frame 11 and the shaft diameter of the bolt 13. As shown in FIG.
In the present embodiment, a rack and pinion 15 of the steering unit is provided along the sub-frame 12. As shown in FIG. 2, a mounting bracket 18 for fixing a rack and pinion 15 is provided on a rear surface of the subframe 12, and the rack and pinion 15 is attached to the mounting bracket 18 by a fastener 16 and a bolt 17. .

Next, an example of a procedure for attaching the lower arm 1 will be described. When attaching the lower arm 1 to the frames 11 and 12, first, the rear bush portion 1 b is attached to the bracket 11 a for attaching the main frame 11.
At this time, the bush portion 1b may be fully tightened. Next, the front bush portion 1a is mounted on the mounting bracket 12a of the sub-frame 12. At this time, the sub-frame 12 is temporarily fixed to the main frame 11 with bolts 13. Therefore, in this state, subframe 12
Can slide in the front-rear direction of the main frame 11, that is, in the front-rear direction of the vehicle body, by the gap of the through hole 14. Thus, the mounting bracket 1 for the sub-frame 12
The position of 2a can be adjusted to the position of the bush part 1a. After the bush 1a is temporarily fixed to the mounting bracket 12a with the bolts 6 and aligned, the bush portion 1a and the mounting bolts 6 and 13 of the sub-frame 12 are properly tightened as appropriate.

Therefore, when attaching the bush portions 1a and 1b, the bushes can be assembled without being deformed. Further, it is possible to mount the apparatus regardless of the slight deviation of the dimensional accuracy of L1 and L2 shown in FIG.
Need not be large. The deformation of the brackets 11a and 12a that occurs when the bolt 13 is tightened is reduced, and the stress applied to the bracket 12a can be reduced.
The tightening torque of the bolt 13 can also be set to a standard value, and the possibility of the bolt itself becoming loose is reduced. Further, since the rack and pinion 15 is fixed to the sub-frame 12, the accuracy of the positional relationship between the mounting point of the ball joint 1c of the lower arm 1 and the point of the rack and pinion 15 is improved.

Although the embodiments of the present invention have been described above, the present invention is, of course, not limited thereto, and various modifications can be made based on the technical concept of the present invention. For example, in the above-described embodiment, the through hole 14 has a circular shape that is sufficiently larger than the diameter of the bolt 13. However, the through hole 14 may be a long hole that extends in a direction suitable for mounting the lower arm 1.
Further, the bush portion 1a on the front side of the lower arm 1 is fixed to the sub-frame 12, but this is fixed to the main frame 11 and the bush portion 1b on the rear side is fixed to the sub-frame 12. Good.

[0011]

As described above, according to the present invention, the bolt through hole for mounting the sub-frame on the vehicle body side is made sufficiently larger or longer than the bolt diameter. The frame can be finely moved in the front-rear direction, its mounting is easy, and the bush can be assembled without deformation. Further, it is not necessary to make the gap s shown in FIG. 6 large. The deformation of the mounting bracket when tightening the bolts when mounting the bush is also reduced,
The stress applied to the bracket can be reduced, the tightening torque of the bolt can be set to a standard value, and the possibility of loosening of the bolt itself is reduced. Furthermore, since the mounting bracket for the lower arm is advantageous in terms of strength, a cost reduction can be expected when a simpler shape or an inexpensive material is used.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a mounting state of a lower arm of a mounting structure of a suspension arm according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state before a lower arm is mounted on a mounting bracket of the sub-frame of FIG. 1;

FIG. 3 is a sectional view taken along line XX in FIG. 2;

FIG. 4 is a rear view showing a state in which a rack and pinion is fixed to the subframe of FIG. 1;

FIG. 5 is a perspective view showing a position where a conventional lower arm is attached.

FIG. 6 is a plan view for explaining a mounting state of a conventional lower arm.

FIG. 7 is a plan view showing a state in which a lower arm in the related art is fixed to a mounting bracket.

FIG. 8 is a side view showing a positional relationship between a mounting point of a ball joint of a conventional lower arm and a mounting point of a rack and pinion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower arm 1a, 1b Bush 2 Tire 11 Main frame 12 Sub-frame 12a Mounting bracket 13 Bolt 14 Through hole 15 Rack and pinion

Claims (1)

[Claims] A pair of main frames disposed in a front-rear direction of a vehicle body, a sub-frame disposed laterally on a front side of the main frame, and the frames and wheels suspended from the main frame. And a suspension arm mounting structure having a lower arm in which a bush portion is mounted to each mounting bracket of the sub-frame, wherein the sub-frame can be mounted on the main frame by changing its position in the front-rear direction on the vehicle body side. When the lower arm is attached, the bush portion on the main frame side is fixed in advance, and when the bush portion on the subframe side is fixed,
A suspension arm mounting structure, wherein the bush portion is mounted by adjusting the position of the sub-frame in the front-rear direction.