JPH072249Y2 - Car suspension arm - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is to integrally form a suspension arm of an automobile, particularly an arm portion and a housing portion by casting, and to integrally provide a spring seat on the upper surface of the arm portion. ,
The present invention relates to a suspension arm for an automobile, which facilitates casting of the suspension arm via the spring seat portion.

[Conventional technology]

As shown in FIG. 5, for example, a suspension system of an automobile includes a suspension arm 3 having one end swingably supported by a frame of a vehicle body and an axle 2 of a wheel 1 rotatably supported at the other end. It consists of a suspension spring 4 and a shock absorber 5 mounted between the upper surface of the suspension arm 3 and the vehicle body, and vibrations and impacts received from road surface irregularities and obstacles while the vehicle is running,
This is intended to prevent transmission to the frame of the vehicle body through the wheel 1 and the axle 2.

A suspension arm of this type is disclosed in
As No. 61-50809, a hub (housing) made by casting for supporting a wheel is integrally fixed to one end of a tubular bracket in a cast case, and the other end of the bracket is pivotally supported by a vehicle body. It has been proposed to weld an arm part by casting, which has an arm and an inner arm.

Further, in the suspension arm, positions of respective parts constituting the suspension arm, such as the housing, the spring seat, and the damper bracket are generally determined from the layout of the suspension system, but as shown in FIG. The suspension system 3'is constructed in a state in which the housing portion 9'and the spring seat 13 ', which are relatively thick, and the arm portion 8', which is composed of the relatively thin outer arm 6'and the inner arm 7 ', are biased. In this case, since it is difficult for the thin-walled portion to circulate the thin-walled portion with respect to the thick-walled portion, it is quite difficult to cast the thin-walled uniform arm portion 8 '. It was generally practiced to insert from the direction and cast.

[Problems to be solved by the device]

However, in the case where the hub (housing) and the arm are formed separately, it is not possible to take advantage of the original merit of the cast-integrated product such that a complicated shape is easily obtained and the productivity is good. In addition, thickening a good portion that is thin leads to an increase in weight, and providing many useless runners to cast a thin wall reduces workability and causes a cost increase. There was a problem that it would end up.

In view of the above, the present invention integrally forms a suspension arm having a spring seat by casting, and utilizes the arrangement position and shape of the spring seat to distribute the hot water to each arm of the arm part branched in three directions. It is an object of the present invention to provide a product obtained by uniformly casting and smoothing, and thinly and uniformly casting arms and the like.

[Means for Solving the Problems]

In order to achieve the above object, a suspension arm of a vehicle according to the present invention comprises an arm portion including an outer arm and an inner arm, and a housing portion continuous with the arm portion, which is integrally formed into a substantially Y shape by casting. It is characterized in that a truncated cone-shaped spring seat is integrally provided on the upper surface near the branch point of the arm portion and protrudes to the uppermost side through a smooth arcuate hem that can be used as a sprue at the time of casting.

[Action]

According to the present invention configured as described above, since the arm portion including the outer arm and the inner arm and the housing portion are integrally formed by casting, the merit as an integrally cast product is not impaired. Moreover, since the hot water flows through the spring seat part integrally provided on the upper surface near the branch point of the arm part and flows smoothly and uniformly in each arm of the arm part during casting, this arm part, etc. Can be cast into a thin and uniform thickness.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

The suspension arm 3 is integrally molded by casting in a substantially Y shape, and is integrally configured from an arm portion 8 including an outer arm 6 and an inner arm 7 extending in two directions, and a housing portion 9 at a base end. .

Bushings 10 and 11 for swingably attaching to the frame of the vehicle body are integrally connected to the projecting ends of the outer arm 6 and the inner arm 7, and the outer arm 6, the inner arm 7 and the high wing portion are connected. On the upper surface near the branch point in three directions with the communication arm 12 to 9,
A truncated cone-shaped spring seat 13 is provided so as to project upward, and a bearing hole 14 is formed inside the housing portion 9 for inserting the axle 2 and rotatably supporting the axle 2.

As shown in FIG. 2, the spring seat 13 is provided for interposing the suspension spring 4 between the upper surface of the spring seat 13 and the frame 15 of the vehicle body with a bump stopper 16 interposed therein.

In this way, the spring seat 13 is provided in the shape of a truncated cone by projecting upward on the upper surface near the branch point of the outer arm 6, the inner arm 7 and the communication arm 12 to the housing portion 9 in three directions. As shown in FIG. 3, when the suspension arm 3 is cast by the mold 17, the hook 19 in which the stopper 18 is arranged is the spring seat.
It is located above 13 and, as shown in FIG.
When the hot water is poured into the inside of each of the arms, the spring seat 13 serves as a guide for each arm, that is, the outer arm 6,
The inner arm 7 and the communication arm 12 flow smoothly and evenly in three directions, thereby casting the arm portion 8 and the like to a thin and uniform thickness, and at the same time pouring hot water to the three-direction arms. This is for eliminating the distortion of the arm portion 8 and the like.

Then, as shown in FIG. 5, the suspension arm 3 is swingably attached to the frame of the vehicle body through the bushes 10 and 11, and the axle 2 is inserted into the bearing hole. The suspension spring 4 is attached via the spring seat 13 between them, and the shock absorber 5 is interposed to form a suspension system.

[Effect of device]

Since the present invention has the above-mentioned configuration, it does not impair the merit of the integrated casting product which is easy to obtain a complicated shape and has good productivity.

Moreover, the flow of hot water to each arm of the branched arm part is improved, and a large amount of hot water is poured into each arm uniformly in a short time, providing a suspension arm equipped with a thin-walled and uniform-thickness arm part. can do.

Further, since the hot water flows to each arm at the same time, there is an effect that the distortion of the arm portion is suppressed, and it is possible to manufacture at low cost without the need to make useless runners.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a plan view, FIG. 2 is an enlarged cross-sectional view of an essential part in a used state, and FIG. 3 is a cross-sectional view showing a mold in a manufacturing stage, FIG. 4 is a partially cutaway perspective view showing the flow of molten metal during casting, FIG. 5 is a perspective view showing a suspension system, and FIG. 6 is a plan view of a conventional example. 3 ... Suspension arm, 6 ... Outer arm,
7 ... Inner arm, 8 ... Arm part, 9 ... Housing part, 12 ... Connecting arm, 13 ... Spring seat.

Claims (1)

[Scope of utility model registration request] 1. An arm portion comprising an outer arm and an inner arm, and a housing portion continuous with the arm portion are integrally formed into a substantially Y shape by casting, and a casting is performed on the upper surface near the branch point of the arm portion. A suspension arm for a vehicle, which is integrally provided with a spring seat in the shape of a truncated cone that protrudes to the top through a smooth arcuate hem that can be used as a sprue.