JP2002337524A - Suspension arm for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems of a conventional plate arm by a simple structure even when an arm body is formed of a pressed metal plate in a suspension arm having a bush supporting member for press-fitting and supporting a bush connected to a fork-like lower end part of a damper across an intermediate part of the arm body with a space therebetween via a connection pin with a drive shaft passing through the space. SOLUTION: The bush supporting member 9 comprises first and second supporting bodies 11 and 12 continuously arranged in the axial direction of the bush in a split manner. Each supporting body comprises cylindrical parts 11p and 12p to be inserted in through-holes H1 and H2 in both side walls K1 and K2 of the intermediate part of the arm body 1 and outwardly-directed flange parts 11f and 12f to be lapped on and welded to outer ends of the cylindrical parts, and a bush B3 is press-fitted to the inner circumference of the cylindrical parts 11p and 12p.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension arm, particularly an arm body having one end connected to a vehicle body and the other end connected to a wheel, and straddling an intermediate portion of the arm body with a gap. The present invention relates to a vehicle suspension arm having a structure in which a bush supporting member for press-fitting and supporting a bush connected via a connecting pin to a fork-shaped lower end of a damper is provided, and a drive shaft passes through the gap.

[0002]

2. Description of the Related Art In a suspension arm having the above structure, a space for avoiding interference with a drive shaft and a protective boot surrounding the joint is provided above an intermediate portion serving as a damper support portion of the arm body. On the lower side, it is necessary to secure space to avoid interference with wheels in full steering or full bump condition.
The installation space in the middle part of the arm body is considerably limited, and the middle part of the arm body needs to be constructed with high strength and high rigidity because a large damper support load acts on it. In order to satisfy all of them, it has conventionally been general to manufacture a suspension arm by forging or casting (see FIG. 10A).

[0003]

However, suspension arms formed by forging or casting have disadvantages such as a large weight and a high cost.

In order to solve this drawback, a suspension arm is already formed by press-molding a metal plate. However, in such a case, a suspension arm is formed by traversing an intermediate portion of an arm body serving as a damper support. The surface shape is easily enlarged, making it difficult to respond to the diversification of vehicle needs in recent years (for example, increasing the wheel diameter, increasing the output of the engine, increasing the size of the drive shaft, etc.), and placing great restrictions on the applicable vehicle types. There were inconveniences such as occurrence.

[0005] As an improved structure of the suspension arm of the above-mentioned plate, for example, as shown in FIG. 10 (b), a cylindrical bush support member for supporting a bush for supporting a lower end of a damper at an intermediate portion of the arm body. A structure was proposed in which a straight collar was used, and this collar was welded to both side walls of the middle part of the arm body. However, in this proposed structure, a sudden cross-sectional change occurred before and after the weld between the collar and the arm body side wall. Since stress concentration occurs there, there is a problem that the welded portion is easily fatigued.

In the above-mentioned collar welding structure, it is necessary to secure the welding margin by protruding the end of the collar (for example, 7 mm) outwardly from the side wall of the intermediate portion of the arm body. In the limited space described above, it is difficult to design the arm body itself to have a sufficient width cross section, and there is also a problem that sufficient arm strength cannot be secured.

The present invention has been proposed in view of the above circumstances, and can solve the above-described conventional problem of the plate arm with a simple structure even if the arm body is formed of a press-formed metal plate. It is an object of the present invention to provide a suspension arm for a vehicle.

[0008]

In order to achieve the above object, the invention according to claim 1 comprises a press-formed metal plate, one end of which is connected to a vehicle body and the other end of which is connected to a wheel. And a bush supporting member for press-fitting and supporting a bush connected via a connecting pin to a fork-shaped lower end of a damper straddling an intermediate portion of the arm main body with a gap therebetween. In a vehicle suspension arm through which a drive shaft passes, the bush support member is divided into first and second supports parallel to each other in the axial direction of the bush, and each of the supports is divided into the arm body. A cylindrical portion to be inserted into the through holes in both side walls of the intermediate portion, and an outward flange formed integrally with the outer end of the cylindrical portion and overlapped and welded to the both side walls, respectively. It has the first and the bush in the circumferential each cylindrical portion of the second support pressed, characterized in that it is fitted.

According to the above feature, even if the first and second supports constituting the bush support member are welded to both side walls of the arm body, the welding is performed outwardly at the outer end of the cylindrical portion of each support. The flange portion and the weld bead do not protrude greatly beyond the side wall of the arm body. That is, unlike the conventional structure using the straight collar as the bush support member, it is not necessary to extend the support member outwardly from the side wall of the arm body in order to secure a margin for welding (the amount of protrusion is limited by the plate of the flange portion). Because it only stops thick)
It is possible to design the arm intermediate portion itself to have a sufficient width cross section in the limited space, and it is possible to secure sufficient strength even for an arm body having a plate structure. In addition, a change in the arm cross section before and after the welded portion between each support and the arm body is suppressed as much as possible, and the concentration of stress at the welded portion and its periphery is reduced as much as possible.

According to a second aspect of the present invention, in addition to the features of the first aspect of the present invention, each of the flange portions does not protrude above and below the side wall portion of the arm body to which it is welded, and each of the flange portions does not project. The arm is formed such that the outer diameter in the arm longitudinal direction is larger than the outer diameter in the vertical direction of the portion. According to this feature, each support (flange)
The welding area of each support (flange) can be extended in the longitudinal direction of the arm while avoiding an increase in the vertical width of the intermediate portion of the arm due to the special installation of the arm, thereby further increasing the bonding strength between each support and the arm body. .

According to a third aspect of the present invention, in addition to the features of the second aspect of the present invention, a portion of each flange portion extending in a longitudinal direction of the arm is formed such that a vertical width gradually decreases as the distance from the bush increases. It is characterized by that.
According to this feature, the change in the arm cross-section before and after the weld between each support (flange) and the side wall of the arm body is effectively suppressed, and the stress concentration at the weld and the periphery thereof is further reduced. Is done.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below based on embodiments of the present invention illustrated in the accompanying drawings.

In the accompanying drawings, FIG. 1 is a perspective view schematically showing a vehicle mounting state of a vehicle suspension arm according to an embodiment of the present invention, FIG. 2 is a perspective view of the suspension arm alone, and FIG. FIG. 4 is a plan view of the suspension arm shown in FIG.
FIG. 5 is an enlarged side view taken along arrow 5 in FIG.
7 is an enlarged sectional view taken along line 6-6 of FIG. 3, FIG. 7 is an enlarged side view taken along arrow 7 of FIG. 3, FIG. 8 is a sectional view taken along line 8-8 of FIG. 7, and FIG. FIG. 8 showing a modified example.
It is a corresponding sectional view.

As shown in FIG. 1, a knuckle N rotatably supporting a wheel W of a wheel has a lower portion provided by a lower arm A and an upper portion provided by an upper arm (not shown). , Simply referred to as a vehicle body F). Further, a damper D with a coil spring S is interposed between the vehicle body F and an intermediate portion of the lower arm A to support the weight of the vehicle body and buffer the vertical movement of the knuckle N.

The lower arm A is a so-called A-type arm, and constitutes a suspension arm of the present invention. The outer end of this lower arm LA is a ball joint B
The first and second inner ends, which are pivotally connected to the knuckle N through the joint J and are bifurcated, respectively, form a pair of front and rear rubber bushes B1, B2 and connection pins J1, J2 penetrating therethrough. And is connected to the vehicle body F.

2 and 3, the lower arm L
The arm body 1 of A is formed by integrally connecting an upper plate 2 and a lower plate 3 formed by pressing a steel plate. At the first inner end on the front side of the arm body 1,
A first bush press-fitting portion P1 for press-fitting and supporting the first rubber bush B1 on the inner periphery, and a second bush press-fitting portion P2 for press-fitting and supporting the second rubber bush B2 on the inner circumference at the second inner end on the rear side. And a support bracket 4 having a mounting hole 4a for supporting the ball joint BJ is welded to the outer end of the arm body 1.

The axis of the first bush press-fitting portion P1 is set substantially in the vertical direction, and the second bush press-fitting portion P2 is set substantially in the front-rear direction of the vehicle body. The second bush press-fitting portion P2 is formed of a cylindrical metal collar C in the illustrated example, and the outer peripheral portion of the collar C is attached to each of the second inner portions on the rear side of the upper plate body 2 and the lower plate body 3. The end is welded w '.

The outer peripheral edge of the upper plate 2 is relatively long downward over its entire periphery except for its outer end and a pair of front and rear inner ends, and the lower plate 3 is Except for the end and the pair of front and rear inner ends, the outer peripheral edge stands relatively short upright over the entire circumference. The outer surface of the upright wall 3a of the lower plate 3 and the corresponding hanging wall 2 of the upper plate 2
The inner surface of the arm body 1 is tightly fitted over the entire circumference of the arm body 1, and the fitting portion is welded w over the entire circumference except for the outer end of the arm body 1 and a pair of front and rear inner ends. You. By this welding w, the arm body 1 composed of the upper and lower plate bodies 2 and 3
Has a sturdy closed-section structure. The upper and lower plates 2, 3
At the substantially central portion of the arm body 1, there are formed depressions g, g, respectively, and the opposing bottom walls of the upper and lower depressions g, g are in direct contact with each other and are formed by a known appropriate fixing means. Be combined.

Next, the structure of the first bush press-fitting portion P1 of the lower arm LA will be described with reference to FIGS.

Each of the first inner ends on the front side of the upper plate 2 and the lower plate 3 has a ring-shaped upper end plate 5 and a lower end plate 6 formed integrally and seamlessly. These upper end plates 5
Upper and lower inner peripheral flanges 5i, 6i are formed on the inner peripheral portions of the lower end plate 6 by burring, respectively, and the upper and lower inner peripheral flanges 5i are formed respectively. , 6i are:
The first rubber bush B1 is a bush press-fitting surface for press-fitting. The upper and lower inner peripheral flanges 5i and 6i are
Each of the tip surfaces 5ie, 6ie abuts over the entire circumference without any gap.

The upper and lower end plates 5 and 6 and the upper and lower surfaces thereof and the outer surfaces of the base ends of the upper and lower inner peripheral flanges 5i and 6i are smoothly connected by curved surfaces (chamfers) each having an arc-shaped cross section. The curved surface serves as a guide surface when the first rubber bush B1 is pressed into the inner peripheral flange 5i. The upper and lower end plates 5, 6 and the upper and lower outer flanges 5o, 6 are also provided.
The connection with the outer surface of the base end portion of o is also smoothly connected by a curved surface (chamfer) having a circular cross section.

The upper and lower inner peripheral flanges 5i, 6i
On the inner peripheral surface of the outer peripheral collar B1c of the first rubber bush B1
Are fitted and held by press-fitting sequentially from one side in the axial direction (upper side in the illustrated example). In this case, the upper and lower inner peripheral flanges 5
The inner diameter tolerance of i, 6i is determined by estimating the amount of elastic deformation due to press-fitting of the first rubber bush B1. The upper and lower inner peripheral flanges 5i, 6i are set slightly smaller than that of the upper (upper) inner peripheral flange 5i so that a sufficient interference is ensured even in the second press-fitting (to the lower flange 6i). In both cases, a sufficient press-fit holding force is ensured.

Each of the outer peripheral portions of the upper end plate 5 and the lower end plate 6 is bent inward so as to substantially follow the inner peripheral flanges 5i, 6i on the inner side thereof, and a pair of upper and lower outer peripheral flanges 5o, 6o are formed. Formed on both outer peripheral flanges 5
The leading end surfaces 5oe and 6oe of o and 6o are opposed to each other with a small annular gap s over the entire circumference.

According to the structure of the first bush press-fitting portion P1 as described above, since the press-fitting portion P1 and the arm body 1 are connected integrally without a seam, it is advantageous in increasing the strength. The number of parts can be reduced.

In particular, a pair of upper and lower inner peripheral flanges 5i, 6
i and a pair of upper and lower outer peripheral flanges 5o and 6o overlapping on the outer side thereof form a double pipe structure on the upper and lower sides, respectively, among them, the reinforcing effect of the outer peripheral flanges 5i and 5o (6i and 6o), and Due to the butting effect of the end faces of the peripheral flanges 5i, 6i, sufficient rigidity and strength equivalent to the collar can be secured at the bush press-fitting portion P1, and the upper and lower end plates 5, 6 are welded (fixed). Is not done,
In the meantime, the lap allowance for welding is not required, and the shape of the end of the arm can be made compact. Therefore, the limited body space around the end of the lower arm LA (in this space, the subframe F as shown in FIG. , The wheel W of the wheel in the full steering state, the transmission case MC, and the like are narrowed by approaching), and the end of the lower arm LA can be laid out without difficulty.

Further, even if the upper end plate 5 and the lower end plate 6 are not welded, the end faces 5 of the inner peripheral flanges 5i, 6i can be formed.
Since the IE and 6ie are in contact with each other, the press-fit load of the bush B1 into these flanges 5i and 6i can be received without difficulty, and the upper and lower inner peripheral flanges 5 can be received.
By appropriately setting the interference of i, 6i, the bush B
The required coupling strength between the two inner peripheral flanges 5i, 6i can be ensured via the first through-hole 1. In addition, the bush B
Even if there is a slight misalignment between the upper and lower inner peripheral flanges 5i and 6i before the press-fitting of No. 1, the upper end plate 5 and the lower end plate 6 are not welded (fixed). Centering of the inner peripheral flanges 5i, 6i can be easily and easily performed, and the press-fit holding force can be stabilized.

Further, since the tip surfaces 5oe and 6oe of the pair of upper and lower outer peripheral flanges 5o and 6o are opposed to each other with a gap s therebetween, the gap s is used as a paint passage in the coating process for the lower arm LA. It is possible, therefore, the tip surfaces 5ie, 6ie of the pair of upper and lower inner peripheral flanges 5i, 6i.
Even when they are brought into contact with each other, the paint is evenly distributed to the annular space between the inner and outer peripheral flanges 5i, 5o; 6i, 6o through the gap s so that the inner surfaces of the flanges 5i, 5o; It can be carried out.

Next, a connection structure between the lower arm LA and the damper D will be described with reference to FIGS.

[0029] of the arm body 1, the intermediate portion 1d of the outer end closer to the damper support part, which fork-like lower end portion 7 of the damper D across to exist a gap s _D is, next to the lower end 7 It is connected via a connecting pin J3 that is bridged and extends substantially in the front-rear direction of the vehicle body, and a third rubber bush B3 that surrounds the pin J3. The intermediate portion 1d of the arm body 1 has a third
A bush support member 9 for press-fitting and supporting the rubber bush B3 into the intermediate portion 1d is attached. A drive shaft 10 for driving a wheel or a protective boot PB for covering a joint of the shaft 10 is disposed so as to pass through the gap s _D , and an outer end of the shaft 10 is integrated with a wheel W of the wheel. It is connected so that it may rotate.

The bush support member 9 is composed of the first and second supports 1 arranged in the axial direction of the third rubber bush B3.
1 and 12, each of which has a support 11,
Reference numeral 12 is formed by press forming a metal plate such as a steel plate.

The first support member 11 is inserted into a first support hole H1 as a through hole formed in one side wall K1 of the intermediate portion 1d of the arm body 1 (the upper plate 2 in the illustrated example). A portion 11p and an outwardly directed first flange portion 11f formed integrally with the outer end of the first cylindrical portion 11p, overlapped on the one side wall K1, and welded all around the outer peripheral edge. The second support 12 has basically the same configuration as the first support 11, and the
The other side wall K of the intermediate portion 1d of the upper plate 2 in the illustrated example.
A second cylindrical portion 12p to be inserted into a second support hole H2 as a through hole formed in the second cylindrical portion 12; and a second cylindrical portion 12p formed integrally with the outer end of the second cylindrical portion 12p, overlapped with the one side wall K2, and the entire outer peripheral edge portion. The outer periphery is constituted by a second flange portion 12f whose outer periphery is welded w ″.

The first and second flange portions 11f, 12f
Cooperate with each other to form a third bush press-fitting portion P3, and an outer peripheral collar B3c of the third rubber bush B3 is press-fitted to the inner peripheral surface of each of the cylindrical portions 11p and 12p. The inner ends of the first and second cylindrical portions 11p and 12p facing each other are in contact with each other without being integrally connected. still,
A slight gap may be set between the opposing inner ends of the cylindrical portions 11p and 12p.

The flanges 11f, 12f are arranged so that they do not protrude above and below the arm body side walls K1, K2 to which the flanges 11f, 12f are to be welded, and that the flanges 11f, 1f are not protruded.
The outer diameter in the longitudinal direction of the arm is larger than the outer diameter in the vertical direction of 2f. In particular, in the illustrated example, it is formed in a horizontally long and substantially elliptical shape. Therefore, the portions of the flange portions 11f and 12f extending in the longitudinal direction of the arm are The vertical width gradually decreases as the distance from the third rubber bush B3 increases.

According to the bush support structure in the intermediate portion 1d serving as the damper support portion of the arm body 1 as described above, the first and second supports 11, 12 constituting the bush support member 9 and the arm body. Welds w "on both sides K1 and K2
Despite that, the welding w "
The outer flange portions 11f and 12f at the outer ends of the cylindrical portions 11p and 12p are provided.
There is no concern that the 12f or the weld bead will protrude greatly outward from the arm body side walls K1, K2. That is, unlike the conventional structure using a straight collar as the bush support member, the bush support member 9 does not need to be largely extended outward from the arm body side walls K1 and K2 in order to secure a welding margin (the amount of protrusion). Is limited to the thickness of the flange portions 11f and 12f), so that the lower arm LA is limited in a limited space.
The intermediate portion itself can be designed to have a sufficient width cross section, and sufficient strength can be ensured even for an arm body having a plate structure. In addition, the change in the arm cross-section before and after the welded portion w ″ between each of the supports 11 and 12 and the arm body 1 is suppressed as much as possible, and the concentration of stress at the welded portion and its periphery is reduced as much as possible.

In particular, in the illustrated example, the flange portions 11f and 12f of the first and second supports 11 and 12 do not protrude above and below the side walls K1 and K2 of the arm body to which they are welded. And the respective flange portions 11f, 12
f is formed so as to be laterally elongated and substantially elliptical so that the outer diameter in the longitudinal direction of the arm is larger than the outer diameter in the vertical direction of f.
Each of the supports 11, 12 (each of the flange portions 11f, 1f) is prevented from increasing the vertical width of the lower arm LA intermediate portion accompanying the special provision of each of the supports 11, 12 (the respective flange portions 11f, 12f).
The welding area 2f) can be extended as long as possible in the longitudinal direction of the arm, so that the bonding strength between each of the supports 11, 12 and the arm body 1 can be further increased. Moreover, each flange portion 11f, 1
A portion of 2f extending in the arm longitudinal direction is a bush B3.
Since the vertical width gradually decreases as the distance from the arm increases, the change in the arm cross section before and after the welded portion between each of the supports 11, 12 (each of the flange portions 11f, 12f) and the arm body side walls K1, K2 is effectively suppressed. As a result, stress concentration at the welded portion and its surroundings is further alleviated.

FIG. 9 shows a modification of the bush support member 9. That is, in the above embodiment, the axial lengths of the cylindrical portions 11p and 12p are formed sufficiently long so that the inner ends of the cylindrical portions 11p and 12p of the first and second supports 11 and 12 come into contact with each other. 1 shows a case in which the supporting strength for the rubber bush B1 is increased. In this modification, as shown in FIG. 9, the cylindrical portions 11p and 12p of the first and second supports 11 and 12 are provided.
Retaining the axial length of the length of the minimum necessary to support the first rubber bush B1, the two cylindrical portions 11p, are set relatively large gap s _P between the inner end mutual 12p. In this case, by shortening the supports 11 and 12 in the axial direction, their press-formability is improved and the yield efficiency of the material is increased, so that cost reduction and weight reduction are achieved.

Although the embodiment of the present invention has been described in detail above, the present invention is not limited to the above-described embodiment, and various small design changes can be made. For example, in the above-described embodiment, the arm main body 1 has a closed cross-section structure in which the upper plate body 2 and the lower plate body 3 are combined and integrated, but in the present invention, the arm main body 1 has an open cross-section, for example, a cross-section. U-shaped or inverted U
It may be formed in a letter shape.

In the above embodiment, the upper plate 2 and the lower plate 3 constituting the arm body 1 are joined by welding. However, in the present invention, the upper plate 2
Alternatively, the lower plate 3 may be connected by a fixing means other than welding.

In the above embodiment, the lower arm LA of the A type was shown as the suspension arm.
For example, the present invention may be applied to an I-arm.

[0040]

As described above, according to the present invention, in a lightweight and low-cost suspension arm having an arm main body made of a press-formed metal plate, the first and second bush supporting members are arranged in parallel in the axial direction of the bush. The second support is divided into two parts, each of which is integrally formed at the outer end of the cylindrical part to be inserted into the through-hole of each side wall of the intermediate part of the arm body, and formed on the both side walls. Each of the first and second supports has an outward flange portion which is superimposed and welded, and a bush is press-fitted and held on the inner periphery of each of the cylindrical portions of the first and second supports. In spite of welding, it is not necessary to extend each support body outwardly from the side wall of the arm main body in order to secure a welding margin, and therefore, there is not enough space for the arm intermediate portion itself in a limited space. Wide cut Can be designed to have sufficient strength, so that sufficient strength can be secured even in the case of a plate-structured arm body, and changes in the arm cross-section before and after the weld between each support and the arm body are minimized. As a result, the stress concentration at the welded portion and its surroundings can be reduced as much as possible, so that the fatigue resistance of those portions can be enhanced.

According to the second aspect of the present invention, the first,
Each of the flange portions of the second support is formed so that it does not protrude above and below the side wall portion of the arm body to which it is welded, and that the outer diameter in the arm longitudinal direction is larger than the outer diameter in the vertical direction of each flange portion. The welding area of each support is extended in the longitudinal direction of the arm while avoiding an increase in the vertical width of the intermediate portion of the arm due to the special provision of each support, so that the bonding strength between each support and the arm body is increased. Can be further enhanced.

According to the third aspect of the present invention, in particular,
The portion of each flange portion of the second support extending in the arm longitudinal direction is formed so that the vertical width gradually decreases as the distance from the bush increases, so that the arm crosses before and after the weld between each support and the arm body. The surface change can be effectively suppressed, whereby the stress concentration at the welded portion and its surroundings can be further alleviated, so that the fatigue resistance at those portions is further improved.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a vehicle mounting state of an automobile suspension arm according to one embodiment of the present invention.

FIG. 2 is a single perspective view of the suspension arm.

FIG. 3 is a plan view of the suspension arm shown in FIG.
3 arrow view)

FIG. 4 is an enlarged sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is an enlarged side view taken in the direction of arrow 5 in FIG. 3;

FIG. 6 is an enlarged sectional view taken along line 6-6 in FIG. 3;

FIG. 7 is an enlarged side view taken in the direction of arrow 7 in FIG. 3;

8 is a sectional view taken along line 8-8 in FIG. 7;

FIG. 9 is a sectional view corresponding to FIG. 8, showing a modified example of the damper supporting portion of the suspension arm.

FIG. 10 is a schematic perspective view showing a conventional suspension arm.

[Explanation of symbols]

B3 Third rubber bush (bush) D Damper F Body or subframe H1, H2 First and second support holes (through holes) J3 Connecting pin K1 One side wall K2 Other side wall LA Lower arm (suspension arm) P3 Third bush press-fitting section (Bushing press-fit portion) s _D gap W Wheel (wheel) w ″ Welding 1 Arm body 1d Intermediate portion 2, 3 Upper and lower plate (metal plate) 7 Fork-like lower end 9 Bush support member 10 Drive shaft 11, 12th 1, 2nd support body 11f, 12f 1st, 2nd flange part 11p, 12p 1st, 2nd cylinder part

Claims (3)

[Claims] 1. An arm body (1) comprising a press-formed metal plate (2, 3) and having one end connected to the vehicle body (F) and the other end connected to the wheel (W). A bush (B3) connected via a connecting pin (J3) to a fork-shaped lower end (7) of a damper (D) straddling an intermediate portion (1d) of the arm body (1) with a gap (s _D ). And a bush support member (9) for press-fitting and supporting the drive shaft, wherein a drive shaft (10) passes through the gap (s _D ).
The bush support member (9) is divided into first and second supports (11, 12) which are parallel to each other in the axial direction of the bush, and each of the supports (11, 12) is connected to the arm body (1). ) Are inserted into the through holes (H1, H2) of both side walls (K1, K2) of the intermediate portion.
12p) and outward flanges (11f, 12f) formed integrally with the outer ends of the cylindrical portions (11p, 12p) and overlapped and welded (w ″) to the side walls (K1, K2), respectively.
f), and the first and second supports (11,
A suspension arm for a vehicle, wherein the bush (B3) is press-fitted and fitted to the inner periphery of each of the cylindrical portions (11p, 12p) of (12). 2. The flange portions (11f, 12f).
Is the side wall of the arm body to which it is welded (K1, K2)
2. An outer diameter in the longitudinal direction of the arm is formed so as not to protrude upward and downward and an outer diameter in a longitudinal direction of the arm is larger than an outer diameter in a vertical direction of each flange portion (11f, 12f). A suspension arm for a vehicle according to claim 1. 3. The respective flange portions (11f, 12f).
Of the arm extending in the longitudinal direction of the arm is a bush (B3)
The vehicle suspension arm according to claim 2, wherein the upper and lower widths are gradually reduced as the distance from the suspension arm increases.