JPH0228011A - Installation structure for control arm - Google Patents

Abstract

PURPOSE:To prevent load from being concentrated into a section where a bracket is fastened by forming the bottom surface of a car body with a recessed strak, and thereby letting the bracket be supported by a bush housed in the streak when one end of the control arm of a suspension is held onto the bottom surface of the car body by the bracket. CONSTITUTION:The lower control arm 11 of a front suspension is held onto the bottom surface of a car body 12 at its inner front and rear end sections 11a and 11b in such a way as to be freely rocked, while a steering knuckle 13 is held at its free end section 11c. In this case, an under panel forming the bottom surface 12 of the car body is formed with two projected streak sections 18 and 19 projecting downward so that a part of a rubber bush 21 fixed onto the end section 11a of the lower control arm is housed in a recessed space 20 formed by these projected streaks 18 and 19. Then, a bracket 22 is put on the recessed space from the downward side of the rubber bush 21 so as to let the recessed space be fastened with the projected sections 18 and 19 with a bolt 23 so that the lower control arm 11 is held onto the bottom surface 12 of the car body.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to an installation structure for a control arm in a suspension vehicle.

b. Conventional technology suspension control arms are located on the bottom of the vehicle body)
It is set up so that it can move freely.

FIG. 4 shows the installation structure of such a conventional lower control arm, in which a rubber bushing 2 is fitted to one end 1a of the lower control arm 1, and a bracket 3 is positioned so as to cover the bushing 2. and fix this bracket 3 to the bottom surface 5 of the vehicle body with bolts 4,
The lower control arm 1 is installed on the bottom surface 5 of the vehicle body.

C0 Problems to be Solved by the Invention By the way, in the conventional lower control arm installation structure described above, the load of the lower control arm l is transmitted to the bracket 3 via the rubber bushing 2, and is transferred to the bottom surface 5 of the vehicle body via the bolt 4. It is caught by the under panel. That is, in the lower control arm installation structure described above, the load on the lower control arm 1 is concentrated at the bolt insertion points of the bracket 3, the bolts themselves, and the bolt insertion points of the underpanel 5.

Therefore, in such a lower control arm installation structure, as shown in FIG. 5, the under panel 5 may deform and the lower control arm l may become misaligned, or as shown in FIG. 4 may be deformed and the tightening of the rubber bush 2 may become loose, or cracks may occur at the bolt insertion portions of the bracket 3 (not shown).

In order to solve this problem, it is possible to increase the thickness of the bracket 3 and the under panel 5 or increase the diameter of the bolt 4, but this increases the weight of the vehicle and increases the cost of the two parts.

Therefore, the purpose of the present invention is to provide a control arm installation structure that can sufficiently handle the load of the lower control arm without increasing the thickness of the bracket or underpanel or increasing the diameter of the bolt. .

d, a! In the control arm installation structure of the present invention, a bushing is fitted to one end of the lower control arm, and a bracket is fixed to the bottom surface of the vehicle body so as to cover the bushing, and the bottom surface of the vehicle body and the above-mentioned In the lower control arm installation structure in which one end of the lower control arm is held between the brackets via the bushing, a groove is formed on the bottom surface of the vehicle body, and at least a part of the bush is accommodated in the groove. There is.

e. Function: In the control arm installation structure of the present invention, the load on the control arm is received via the bushing on the bottom surface of the vehicle body, that is, on a wide area, so there is no concentration of load.

f. Embodiment FIG. 1 shows an example in which the control arm installation structure according to the present invention is applied to a front suspension of a vehicle, and FIGS. 2 and 3 show the main parts thereof.

Ends 11a and llb of the lower control arm 11 are swingably supported by the vehicle bottom 12, and their free ends li
e holds the steering knuckle 13. The steering knuckle 13 holds a hub 15a of the wheel 15 via a bearing I4, and this hub 15a is
It is fixed to the end of the axle shaft 16.

Furthermore, the steering knuckle 13 is connected to a tie rod 17 at the end of the arm 13a.

The installation structure of the lower control arm end portion 11a described above on the vehicle body bottom portion 12 is as follows.

As shown in FIG. 2, the underpanel forming the bottom portion 12 of the vehicle body has two protruding stripes 18 and 19 that protrude downward. And those ridges a day.

A part of the rubber bush 21 fixed to the lower control arm end 11a is accommodated in the concave section 20 defined by the groove 19, and a bracket 22 is placed from below, and the bracket 22 is secured to the convex section by bolts 23 and 23. Part 18
．． 19 to conclude. In this way, the lower control arm 11 is installed on the bottom surface 12 of the vehicle body.

Note that, as shown in FIG. 1, a bracket 25 for the stabilizer 24 and a bracket 26 for holding the other end 11b of the lower control arm 11 are fastened to the protruding portions 18 and 19, respectively.

In such a control arm installation structure, the load on the lower control arm 11 is reduced by the rubber bushing 2.
However, part of the load is received by the groove 20 on the bottom surface 12 of the vehicle body, and the other part is received by the bracket 22 . Bolt 23. Attach the bottom of the vehicle body (under panel) 1 via 23.
It is accepted in 2.

In the above embodiment, the two protruding stripes 18 and 19 are formed on the under panel 12 to define the concave strip 20 between them, but as shown in FIG. , the grooved portion 20 may simply be formed on the amplifier panel 12.

g. Effects of the Invention As mentioned above, according to the control arm installation structure according to the present invention, the load on the control arm is distributed to the bottom of the vehicle body, so the entire load is not concentrated at the fastening point of the bracket, and therefore It can sufficiently withstand the load of the control arm without increasing the thickness of the underside of the vehicle body (under panel), the thickness of the bracket, or the diameter of the bolt.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional plan view showing a suspension employing the control arm installation structure according to the present invention, and FIG.
Figure (a) is a perspective view showing the main parts of the control arm installation structure, Figure 2 (b) is a sectional view of the main parts, and Figure 3 is a modification of the control arm installation structure according to the present invention. Figure 4(a) is a sectional view of the main part showing the conventional control arm installation structure;
FIG. 5 is a sectional view of the main part, and FIGS. 5 and 6 are sectional views of the main part showing problems caused by the conventional control arm installation structure. 11...Lower control arm, 11a, llb...end, 12...bottom of vehicle body (under panel), 18, 19...
- Convex strip, 20... Concave strip, 21... Rubber bush, 22... Bracket, 23... Bolt. Figure 2 Figure 3

Claims (1)

[Claims] A bush is fitted to one end of the control arm, and a bracket is fixed to the bottom of the vehicle body so as to cover the bush, and the one end of the control arm is sandwiched between the bottom surface of the vehicle body and the bracket via the bush. An installation structure for a control arm, characterized in that a groove is formed on the bottom surface of the vehicle body, and at least a portion of the bush is accommodated in the groove.