JPS59102606A - Suspension apparatus for car - Google Patents

Abstract

PURPOSE:To secure a proper strength and reduce the whole weight of the captioned apparatus by forming two arm members by bending each plate material and forming an A-figure-shaped suspension lower arm through mutual superposition and welding, in a double wishbone-type suspension apparatus. CONSTITUTION:The first arm member 21 which is equipped with an upper wall part 21a having a concaved part 21i at a part, side wall parts 21b and 21c, horizontal flange parts 21d and 21e, tilt sidewall part 21f, and a flat-plate-shaped extension part 21g is formed by bending a plate material. Similarly, the second arm member 22 which is equipped with an upper wall part 22a, side wall parts 22b and 22c, horizontal flanges 22d and 22e, and a reinforcing wall part 22h is formed by bending a plate material. The second arm member 22 is superposed onto the first arm member 21 at a ball-joint installation part 23 and joined through welding. With such constitution, the joint part is formed into double structure, and the rigidity of the rear side part where strength is necessary is improved because of closed sectional structure, and the front side part where strength is unnecessary is formed into a simple structure and made lightweight.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an automobile suspension system, particularly a double wishbone type suspension system.

Conventionally, when applying a double wishbone type suspension device to a front-engine, front-drive vehicle, using an I-type suspension lower arm and arranging it so that the drive shaft passes through it, it is effective against lateral loads. Since the strength is inferior, it is known that an A-shaped arm made by bending and forming seven plates was used to improve the strength (for example, Jitsukasho, 51.-
1. ．． No. 2202).

However, with the above structure, the suspension lower arm is formed by bending and forming seven plates, so if the plates are made thinner in order to reduce weight, the lower end of the shock absorber will be supported at the part h. However, the strength will be poor in areas where relatively high strength is required, such as the area where the ball joint is attached and the area where the stock lever that restricts the vertical swing of the suspension lower arm comes into contact. If the thickness of the plate is increased, the overall weight will increase, making it impossible to reduce the weight.

The present invention has been made in view of this point, and by welding and joining a first arm member and a second arm member formed by bending and forming a plate material to form a suspension lower arm that is an A-type arm, the suspension lower arm The main object of the present invention is to provide a suspension device for an automobile, which has appropriate strength in each part in consideration of load sharing in each part, and is lightweight.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to embodiments with reference to the drawings.

In FIGS. 1 to 3 showing a suspension device A for an automobile (front engine, front drive vehicle), 1 is a suspension lower arm, 2 is a suspension upper arm, 6 is a crew arm, 4 is a drive shaft, and 5 and 6 are Ball joint 7 is the front wheel. The suspension lower arm 1 is an A-type arm, and is supported at front and rear vehicle body mounting portions 8, 9 so as to be able to swing up and down about an axis in the longitudinal direction of the vehicle body.

Reference numeral 10 denotes a shock absorber whose upper end is connected to the vehicle body frame (not shown), while its lower end is pivoted to a support bracket 11 with a cross-sectional shape fixed to the suspension lower arm 1. .

Reference numeral 12 designates a lower stop rubber that abuts and engages with the abutting member 13 of the suspension lower arm 1, thereby regulating the maximum amount of upward swinging of the suspension lower arm 1. On the other hand, the upper stop rubber 14 is fixed to the front frame 16 via a mounting bracket 15, and is brought into abutment engagement with the abutting member 17 on the suspension upper arm 2, and is moved downwardly by the suspension device. The maximum amount of swing is regulated. Since both the arms 1 and 2 are connected by the knuckle arm loop, the amount of vertical swing of the arms 1.2 is regulated by the stop rubbers 12.14. .

18 is a torsion bar, suspension lower arm 1
A suspension lower arm 1 is connected and fixed to the rear vehicle body mounting portion 9 with a distal end of the suspension lower arm 1 connected to a vertically swinging shaft (axis) eccentrically upward (for example, about 20 tnjn). This torsion e-18 has its tip end eccentrically upward so that its rear end extends above a cross member (not shown) having sufficient strength at an appropriate distance.

In addition, the front wheels 7 are in the maximum right turning state S1 in FIG.
and the maximum left turning state S2 is shown.

Next, regarding the structure of suspension lower arm 1,
This will be explained in detail with reference to FIGS.

The suspension lower arm 1 is formed by welding together a first arm member 21 and a second arm member 22 which are formed by bending and forming a plate material 11 (plate 11).

The first arm member 21 extends rearward from the front body attachment part 8, while the second arm member 22 extends forward from the rear east body mounting part 19, and extends above the first arm member 21. , the second arm member 22 is overlapped at least at the ball joint attachment portion 26 at the center of the arm to improve strength.

Further, the first arm member 21 includes a clay wall portion 21a in which a recess 211 is formed in a part, and side wall portions 21b extending substantially vertically downward from both side edges of the clay wall portion 21a.

2IC, and a horizontal flange portion 21d extending substantially horizontally outward from the lower edges of the side wall portions 21b and 21c.

21e, an inclined wall portion 21f extending obliquely downward from the rear edge of the earthen wall portion 21a, and an inclined wall portion 21f extending substantially horizontally rearward from the lower edge of the sloped portion 21f, formed by lowering the earthen wall portion 21a downward. Basically, it has a flat plate-like extension part 21q. Note that one of the seven horizontal flange portions 21d and 21e has a reinforcing wall portion 21 extending substantially vertically upward from the side edge.
h are consecutively provided.

On the other hand, like the first arm part 21, the second arm member 22 also includes a clay wall part 22a, both sides (7) of the clay wall part 22e, side wall parts 22b and 22c, and the side wall part 22b.

22G has horizontal flange portions 22d and 22e at the lower edge, and a reinforcing wall portion 22h continuous to one of the horizontal flange portions 22d and 22e.

Thus, in the second arm member 22, the front edge portion of the upper wall portion 22a is overlapped with the rear edge portion of the earthen wall portion 21a of the first arm member 21, and the horizontal flange portion 22d,
At 22e, it is joined to the extension part 21q side of the first arm part paulownia 21, so that the rear part of the suspension lower arm 1 has a closed cross-sectional structure.

If configured as above, suspension lower arm 1
In this case, the area near the ball joint attachment part 23 at the center of the arm, where strength is required, has a double structure made of overlapping plates, and the strength is also reduced due to the mounting of the shock absorber 10 and the rocking restriction by the stopper rubber 12. The rear part, which is required to have a closed cross-section structure, has increased rigidity, while the front part, which does not require much strength, is made of only plate material. The strength is properly distributed,
It is also advantageous in terms of weight reduction.

Furthermore, in making the rear part of the suspension lower arm a closed cross-section structure, the first arm member is extended rearward, which eliminates the need for a separate material, which is advantageous in terms of molding. Since it is closed by the inclined wall extending from the earthen wall of the first arm member, it is possible to prevent mud thrown up by the wheels from accumulating within the closed cross section.

With the structure described above, the present invention has a practical advantage in that it is possible to give appropriate strength to each part of the suspension lower arm in consideration of the load sharing in each part, and it is also possible to reduce the weight. It has a great effect.

[Brief explanation of the drawing]

Claims (1)

[Claims] (/) The A-type suspension lower arm, which swings up and down about the vehicle body attachment part, is made up of a first arm member formed by bending and forming a plate material and a second arm part, which are welded together. The member and the second arm member each have an earth wall portion, side wall portions on both sides of the earth wall portion, and a horizontal flange portion at the lower edge of the side wall, and the first arm member extends rearward from the front vehicle body attachment portion, while the first arm member has a The two arm members extend forward from the rear vehicle body attachment portion, and the two arm members are overlapped at the ball joint attachment portion in the center of the arm, and the second arm member lowers the earthen wall portion of the first arm member downward. 1. A suspension device for an automobile, characterized in that a flat plate-shaped extension portion formed by the above process is joined to a lower surface to form a closed cross-section structure.