JPH0653445B2 - Car suspension arm - Google Patents

Description

The present invention relates to a suspension arm for an automobile.

[Prior art]

In suspension arms of automobiles, a structure is widely adopted in which one end of the arm is swingably supported on the vehicle body and a hub supporting wheels is coupled to the other end of the arm. Since the hub is generally manufactured by casting and the hub is generally manufactured by casting, there is a problem that a large welding strain is generated in the joint when the two are joined by welding.

Therefore, in the conventional suspension arm, for example,
As shown in Japanese Patent Laid-Open No. 56-56410, the arm and the hub were connected by bolts, but in this case, a bolt seat or the like must be formed on the arm or the hub, which makes the wall thick and large. There was a problem of inviting up.

[Object of the Invention]

In view of the above problems, the present invention is to provide a suspension arm for an automobile that can realize weight reduction.

(Structure of the Invention) Then, as a result of earnest research on a method of connecting the arm and the hub, which can reduce the weight of the suspension arm, the present inventor intervenes a bracket between the two and attaches the bracket to the arm and the hub by welding and casting. I found that they should be combined.

That is, according to the joining method by welding, it is not necessary to form the above-described bolt seat or the like, and the weight is not increased, but in this case, the problem of welding distortion occurs as described above. By the way, such welding distortion is considered to be caused by the fact that the forged product and the cast product are directly welded to each other. Therefore, if a bracket having good weldability with the forged product is interposed between the arm and the hub, it can be expected that at least the arm and the bracket can be welded well without causing large welding distortion. How to connect the bracket and the hub becomes a problem.

Considering the casting method here, in general, the casting method is a method of melting a metal material and pouring it into a mold to solidify the product, but in this casting method, in order to control the solidification temperature, The technology of casting a chilled gold ring is widely known. Since the hub is manufactured by casting, it is considered that the hub and the bracket can be firmly joined together by using the technique of cast metal.

Therefore, the present invention relates to a suspension arm for an automobile, in which a control hub, which is a cast product, which supports a wheel, and an arm, which is a forged product whose one end is pivotally supported by a vehicle body, are coupled to each other. One end side of the cylindrical bracket is integrally fixed to the other end by casting, and the other end side of the bracket is fitted to the other end of the arm and is joined by welding. The arm and the hub are connected to each other without generating a bolt and without using a bolt.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show a vehicle suspension arm according to an embodiment of the present invention, which is an example applied to a semi-trailing type rear suspension arm. The arm 1 is formed in a substantially Y shape, and both ends of the arm 1 are swingably supported by a sub arm (vehicle body) extending in the vehicle width direction.

A control hub 2 is connected to the rear end of the arm 1. The control hub 2 has a through hole 4 through which the shaft of the rear wheel 3 penetrates, and a support portion 5 for supporting the lower end of the suspension tower. Further, the control hub 2 is formed with a ball joint portion 6 and two bush portions 7a and 7b. The control hub 2 supports the wheel hub of the rear wheel 3 through the ball joint and the two rubber bushes so as to support the float. It has become.

A tubular bracket 8 is provided at the joint between the arm 1 and the control hub 2. One end side of the bracket 8 is integrally fixed to the tip end of the control hub 2 by a cast case, and the other end side of the bracket 8 is fitted to the rear end of the arm 1 and joined by welding.

In the suspension arm of the present embodiment as described above, since the arm and the control hub are connected by welding and cast iron, it is not necessary to provide a bolt seat or the like in the case of bolt connection. As a result, it can be made thin and lightweight, and the connecting structure is simple.

Also, in this suspension arm, a bracket is interposed between the arm and the control hub, and the arm and the bracket are welded together, and the bracket and the control hub are joined together by casting, so that the arm and the control hub are connected. No large welding distortion occurs as in the case of direct welding.

The present invention is not limited to the above embodiment,
Various modifications and changes are possible, for example, the hub is not a control hub, that is, one that indirectly supports wheels,
It may directly support the wheels, and the type of arm may be other than the semi-trailing type.

〔The invention's effect〕

As described above, according to the present invention, a vehicle suspension in which a control hub, which is a forged product that supports wheels, and an arm, which is a forged product whose one end is pivotally supported by the vehicle body, is connected. In the arm, one end side of the tubular bracket is integrally fixed to the hub by a cast case,
Since the other end side of the bracket is fitted to the other end of the arm and is joined by welding, weight reduction can be achieved without causing inconvenience such as welding distortion, and the joining structure is very simple. There is an effect.

[Brief description of drawings]

1 and 2 are a plan view and a side view of a suspension arm of an automobile according to an embodiment of the present invention, FIG. 3 is a side view of a main part of the suspension arm, and FIG. 4 is a part of the suspension arm. FIG. 1 ... Arm, 2 ... Hub, 3 ... Wheel, 8 ... Bracket.

Claims (1)

[Claims] 1. A control hub, which is a cast product, for supporting wheels, an arm, which is a forged product, having one end pivotally supported by a vehicle body and the other end joined to the hub, the hub, and the hub. A suspension arm for an automobile, comprising: a tubular bracket which is interposed in a joint portion with an arm and has one end side integrally fixed to the hub by a cast case and the other end side welded to the arm.