JPS58218407A - Structure of i-shaped arm of car front wheel suspension - Google Patents

Abstract

PURPOSE:To reduce material expenses, processing expenses and also weight by forming I-shaped arm, with bearing holes and fitting holes for various related members, into a special shape and making its whole body producible by means of steel plate processing. CONSTITUTION:An I-shaped arm 1 is provided with a bearing hole A of a ball joint on its one end, and a cross member fitting hole C on the other end and also a fitting hole B for a stabilizer, used also as a tension rod, to the bearing hole A between the abovementioned two holes. In this condition, a recessed part 10 gradually growing shallower and narrower toward the hole C side is formed in an appropriate position of a steel plate material work and a hole metallic material B' is inserted into its bottom hole. A side wall 11 of the recessed part 10 is a double well formed with a doubled steel plate except the hole A side. Also, a part to the hole A of the material work is a double part 12 formed by doubling up to the end part, which is dropped semicircularly and inserted with a hole metallic material A'. As for the hole C part, a hole metallic material C' is inserted into a cylindrical part 13 after a material work is squeezed out.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a part machining arm for a front wheel suspension system of an automobile.

The lower arm, that is, the shaped arm of the above-mentioned suspension system is a conventional product with a ball joint bearing hole (hole A) at one end and a cross member at the other end, as shown in a plan view in Figure 1a and in a side view. with the mounting hole (hole C).

A rod-shaped piece with a stabilizer/tension rod mounting hole (hole B) closer to hole A between hole A and hole C.
and the axes thereof are parallel to each other, and these and the l hole are perpendicular to each other. Conventionally, this product has been made from a forged product, and therefore has the disadvantage that both the material cost and the processing cost per weight are high. According to the present invention, this is constructed mainly by press working from a steel plate, and is a low-cost, lightweight structure suitable for mass production. Fig. 2a shows a plan view thereof, and Fig. 2b shows a side view thereof.

In the figure, lO is a recess in hole B in which metal fitting B' is accommodated, and this recess gradually becomes shallower and narrower toward the hole C side. A hole 10a is punched out at the bottom of the recess 10, into which a hole fitting B' made of steel plate shown in FIG. By bending the material work, it becomes a double wall, which together with the bottom 10b of the recess forms a shaped cross section and provides bending strength to the stabilizer and tension rod.

At the hole A portion, the side outer walls 11a of the double side walls 11 of the recess extend and merge to form a double portion 12 of the steel plate by bending G of the material work 1', and the end thereof is dropped into a semicircular shape. A hole is punched out for the metal object A', the metal object A' is placed there, and a portion a' around the body is welded. The hole hardware A' is also made of steel plate.

A cylindrical portion 13 is formed with respect to the hole C by drawing a longitudinal end of the material workpiece. The recess lO in the arm body is the hole C
The double wall 11 is no longer close, and the double wall 11 is only an extension of the outer wall 11a in this part, so the cross section of the arm in this part is in the shape of a square.

Since the cylindrical portion 13 that accommodates the hole hardware C' of the hole C is formed by aperture as a continuous part of the cross-sectional shape of the arm, the body portion 13a connected to the outer wall +1a is only half the circumference, and the cylindrical portion 13 that accommodates the hole hardware C' of the arm is formed by drawing. End portion 1 of the cylindrical portion 13 continuous to the top surface 14
3 Only b has a full circumference. A hole metal fitting C' shown in FIG. 3C is manually welded to the cylindrical portion 13.

The edge of the raw material work 1' is bent at right angles to form a collar-shaped portion 15 that surrounds the entire circumference of the arm body 1, thereby increasing the strength of the arm.

Next, the press working process of this arm body 1 will be explained with reference to FIGS. 4a to 4h.

(1) Blanking (Figure a) Punch out the material work 1'.

Field (2) Primary drawey, jig (Figure b) Rough pressing of the dent lO (3) Secondary drawwig (Figure C) Reshaping of dent 10.

(4) Forming (Figure d) Bending the outer wall 11a. Cylinder part 13. Extrusion of body part 13a and bending of collar 15.

(5) Trimming, piercing (Fig. 0) JL B, punching hole C and cutting the outer periphery of collar 15.

(6) Clinch (Figure f) Press from the direction of the arrow to create double walls 11 and double portions 12.

(7) Notching, piercing (figure g) double part 1
Drop the tip of No. 2 into a circle and punch out a hole into which hole hardware A' will fit.

(8) Burring (Figure h) -TL 0 part is extruded at the end 1 in the cylinder part 13.
Make 3b.

The hole metal parts A/, B/, and a/ are made by a normal processing method and will not be particularly explained.

In addition, the cross section of the arm is shaped like a ] character, and holes B are placed on both sides of the arm.
Is it possible to consider a structure in which a hole is punched out to accommodate the ?

According to this, it is not possible to increase the section modulus of the part where the most force is applied to the arm, so in the present invention, this part is shaped to have a large strength against the force in the axial direction of hole B as described above. .

As described above, the lower arm of the present invention can be manufactured entirely by press working from a steel plate, and is therefore low cost, lightweight, and suitable for mass production.

[Brief explanation of drawings]

Fig. 1a is a plan view and a side view of a conventional shaped arm for an automobile front wheel suspension system, Fig. 2a is a plan view and a side view of the same product of the present invention, and Fig. 3a is a side view. In Fig. 2a, hole B section, hole A section, and hole C section are all cross-sectional views passing through the hole axis, and Fig. 4 a - h are explanatory diagrams of the machining process of this arm. Figure a is blanking. Figure b is a primary drawing, Figure C is a secondary drawing, d
The figure is forming, figure 0 is trimming, piercing, f
The figure shows the clinch, and the g figure shows the notching. Piercing, Figure h is a perspective view showing each shape of the burring. A Ball joint bearing hole A' Same hole hardware B
Stabilizer/tension rod, mounting hole B' Open-hole hardware C Cross member mounting hole C' Same-hole hardware 1 Arm body 1' Same-material work IO Hole B Hole hardware B' fits in recess 10a Open-bottom hole 10b Same Bottom of the recess 11
Side wall of work recess lO 11 a Double part of outer wall of pusher outer wall 12 13 Cylindrical part in which hole hardware C' is accommodated 13 a
Body part 13 b Same end part 14 Arm top surface 15 Brim-shaped part □ : Pa : 1 Applicant Hiruta Kogyo Co., Ltd. Agent Kawa 1) Shigeo Figure 33a

Claims (1)

[Claims] -i is a bearing hole (hole A) of a ball joint. Construction of a front wheel suspension system that has a cross member mounting hole (hole C) at the other end, and a stabilizer/tension rod mounting hole (hole B) that is closer to hole A and parallel to hole C and the axis between these holes. A structure in which the arm is made of steel plate as shown below. (a) According to the development diagram of the arm body, a recess is made to accommodate the hole B hardware at a position corresponding to hole B in the punched steel plate material workpiece, and this recess gradually becomes shallower and narrower toward the hole C side, and the hole B hardware is placed in the hole B. is placed in the hole at the bottom of this recess and welded. (b) The side walls of the recess, except for the hole A side, shall be double walls made of bent steel plates. (,) The part of the material work close to the hole A is double-folded by bending it to the end, and the end is dropped into a semicircle, and the bearing hardware of the ball joint made of steel plate is welded to the body of the part. (d) Hole C is a cylindrical part made by drawing at the end of the workpiece, and a key metal is fitted into it and welded. (e) The edge of the workpiece is bent at right angles over its entire circumference to form a collar-shaped portion surrounding the arm body.