JP2002166714A - Suspension arm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suspension arm constituted to effectively reinforce without increasing thickness of an arm constituting member. SOLUTION: Reinforcing plates 21, 22 extending along the longitudinal direction (vehicle body left and right directions) of a suspension arm main body 7 are arranged in a hollow part S of the suspension arm main body 7, and the hollow part S of the suspension arm main body 20a is partitioned into at least two closed cross-section spaces (for example, three closed cross-section spaces S1, S2, S3) by the reinforcing plates 21, 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension arm used for a vehicle.

[0002]

2. Description of the Related Art Strut suspensions (front suspensions) used in four-wheeled vehicles, etc.
As shown in FIG. 10, a strut 1 for buffering the vehicle body is provided. The upper end of the strut 1 is attached to the vehicle body, and the lower end is attached to the upper end of a steering knuckle (not shown) attached to the front wheels. Further, a suspension arm 3 is disposed so as to extend substantially along the left-right direction of the vehicle body ahead of the drive shaft 2 with respect to the vehicle body, and one end of the suspension arm 3 (an outer end of the vehicle body) is provided at the lower end of the steering knuckle. The other end (the inner end of the vehicle body) is rotatably attached to the vehicle body 4.

A conventional suspension arm 3 is shown in FIG.
As shown in FIG. 13, two arm components (press-formed products) 5 and 6 each having a substantially U-shaped cross section are joined to each other so as to form a hollow portion S having a closed cross section, and are joined by welding W. A suspension arm body 7, a joint connecting portion 8 provided at one end of the suspension arm body 7 for attaching one end of the suspension arm body 7 to the wheel side via a joint, and a second end of the suspension arm body 7 facing the vehicle body. Suspension arm body 7 for mounting
And an I-type suspension component having a vehicle body mounting portion 9 provided at the other end of the suspension. The above-mentioned suspension arm body 7 has a joint connecting portion 8 and a vehicle body attaching portion 9.
Is provided with a stabilizer mounting hole 11 for mounting the end of the stabilizer 10 at a location between FIGS.
2). The suspension arm 3 shown in FIG.
Is used for a suspension portion on the left side of the vehicle body, and the suspension arm 3 shown in FIG. 11 is used for a suspension portion on the right side of the vehicle body.

[0004] The stabilizer 10 described above comprises a drive shaft 2 and a suspension arm 3 as shown in FIG.
Both ends of the stabilizer 10 are attached via rubber bushes 12 to suspension arms 3 which are arranged at positions on the front side of the vehicle body and are disposed at both ends in the lateral direction of the vehicle body. Specifically, a rubber bush 12 is fitted into a stabilizer mounting hole 11 provided at an intermediate position in the longitudinal direction (the lateral direction of the vehicle body) of the suspension arm 3, and the end of the stabilizer 10 is inserted into the rubber bush 12. Held in state. In FIG. 10, reference numeral 13 denotes a suspension spring disposed so as to surround the strut 1, and reference numeral 14 denotes a wheel hub that rotatably supports a front wheel (not shown).

[0005]

The strut as described above
Suspension arm used in suspension
The system 3 mainly includes a large braking load during braking,
From the stabilizer 10 when an impact force is input
Large load acts. That is, at the time of braking, FIG.
Toward the rear of the vehicle body at the joint connecting portion 8 as shown in FIG.
Direction braking load F ₁As they work,
The arm 3 changes as shown by the dashed line in FIG.
And the maximum response at the front part M of the stabilizer mounting hole 11
The stress concentrates and generates the maximum stress on the periphery of the stabilizer mounting part
Location. When an impact force is input from the front, FIG.
As shown in FIG. 5, the stabilizer is connected via the stabilizer 10.
Impact load F from the front side of the mounting hole 11_TwoAs they work
Therefore, the suspension arm 3 is a single-dot chain in FIG.
It is deformed as shown by the line, and the rear part of the stabilizer mounting hole 11
The maximum stress is concentrated at the point N and the area around the stabilizer
The edge is where the maximum stress occurs. Therefore, such suspension
Extremely severe load conditions for the Pension Arm 3
It must be configured as a member that can withstand the above.

Further, when it is desired to improve the shock resistance of the suspension arm 3, or when it is desired to use the suspension arm 3 in common for a vehicle of a high-end model, the strength of the suspension arm 3 must be further increased. .
In order to increase the strength of the suspension arm 3, it is conceivable to increase the plate thickness of the arm components 5 and 6 of the press-formed product constituting the suspension arm 3. However, if the plate thickness is increased, the weight of the suspension arm 3 is increased. This causes a problem that the weight of the vehicle increases and the weight of the vehicle increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a suspension arm having a structure capable of performing effective reinforcement without increasing the thickness of arm constituent members. To provide.

[0008]

In order to achieve the above-mentioned object, according to the present invention, there is provided a suspension comprising two arm members having a substantially U-shaped cross section joined to each other so as to form a hollow section having a closed cross section. An arm body, a joint connecting portion provided at one end of the suspension arm body for attaching one end of the suspension arm body to the wheel side via a joint, and an armature for attaching the other end of the suspension arm body to the vehicle body side. A suspension having a vehicle body mounting portion provided at the other end of the suspension arm main body, and having a stabilizer mounting hole for mounting a stabilizer at a position of the suspension arm main body between the joint connecting portion and the vehicle body mounting portion. The suspension arm in the hollow portion of the suspension arm body. Deployment arm disposed in the longitudinal direction extending along the reinforcing plate of the main body, so that partition into at least two closed sectional space a hollow portion of the suspension arm main body by the reinforcing plate. Further, in the present invention, a reinforcing plate is attached inside each of the two arm constituent members having a substantially U-shaped cross section, and two reinforcing plates are provided in the hollow portion, whereby the hollow portion of the suspension arm main body is provided. Is divided into three closed sectional spaces.
Further, in the present invention, the reinforcing plate is disposed so as to extend on both sides in the longitudinal direction of the arm constituent member with the stabilizer mounting hole as a center of the arm constituent member, and the stabilizer mounting hole and the joint connecting portion are connected to each other. The length of the reinforcing plate portion extending between the stabilizer mounting hole and the length of the reinforcing plate portion extending between the stabilizer mounting hole and the vehicle body mounting portion is substantially equal to the length between the stabilizer mounting hole and the joint connecting portion. I try to set the same. Further, in the present invention, the periphery of a stabilizer mounting boss provided on the arm component member for forming the stabilizer mounting hole is formed as an inclined surface, and the engaging hole engaging with the inclined surface is formed with the reinforcing plate. And the engaging hole of the reinforcing plate is engaged with the inclined surface of the stabilizer mounting boss portion of the arm component so as to perform relative positioning between the arm component and the reinforcing plate. I have to. Further, in the present invention, a flange portion is provided on the reinforcing plate, and the flange portion of the reinforcing plate is brought into contact with an inner surface of the arm component to be fixed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In FIGS. 1 to 9, the same parts as those in FIGS. 10 to 15 are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 shows a suspension arm 20 according to an embodiment of the present invention. The suspension arm 20 according to the present embodiment is formed by adding two reinforcing plates 2 to an existing suspension arm 3 conventionally used.
1 and 22 are added. The above-mentioned two reinforcing plates 21 and 22 are provided in a hollow section S having a closed cross section in the suspension arm body 7, that is, in the suspension arm body 7.
Are disposed in (inside) a closed section space S surrounded by the two arm constituent members 5 and 6, the joint connecting portion 8 and the vehicle body attaching portion 9, and the reinforcing plate 21 is attached to the arm constituent member 5. The reinforcement plate 22 is attached to the back surface of the arm component member 6 by welding.

More specifically, the above-mentioned arm constituting members 5 and 6 are formed of press-formed products having the same shape, and have a longitudinal substrate portion 23 and a pair of upper and lower ends of the substrate portion 23 formed by bending. Bent portion 24 and stabilizer mounting hole 11
And a stabilizer mounting boss portion 25 formed by drawing at an appropriate position of the substrate portion 23. The periphery (outer peripheral surface) of the stabilizer mounting boss portion 25 of each of the arm components 5 and 6 is formed as a truncated cone-shaped inclined surface 26 as shown in FIGS. 1, 2 and 4. On the other hand, the above-mentioned reinforcing plates 21 and 22
It is made of a press-formed product having the same shape, and has a longitudinal substrate portion 27.
And two pairs of flange portions 28 which are bent and formed so as to face each other at both ends in the longitudinal direction (the lateral direction of the vehicle body) of the substrate portion 27. An engagement hole (circular hole) 29 having a size and shape capable of engaging with the inclined surface 26 of the stabilizer mounting boss 25 of the arm component member 5 or 6 is formed at an appropriate position of the substrate portion 27. .

The procedure for manufacturing the suspension arm 20 will now be described. First, the engaging hole 29 of the reinforcing plate 21 is engaged with the stabilizer mounting boss 25 of the arm component member 5, and the inclined surface 26 of the stabilizer mounting boss 25 and the engaging hole 29 of the reinforcing plate 21 are engaged. The relative positioning between the arm component 5 and the reinforcing plate 21 is performed in such a manner that the flange portion 28 of the reinforcing plate 21 is brought into contact with the inner surfaces of the pair of upper and lower bent portions 24 of the arm component 5. In this state, the upper and lower edges of the substrate portion 27 of the reinforcing plate 21 and the peripheral edge of the engaging hole 29 of the reinforcing plate 21 are welded to the inner surface of the bent portion 24 and the inclined surface 26 of the stabilizer mounting boss 25. At W ₁ and W _2, respectively (FIG. 2,
And FIGS. 4 to 7). In exactly the same manner, the reinforcing plate 22 is connected to the arm component 6 by welding.

Next, the end faces of the bent portions 24 are joined together with the arm members 5 and 6 to which the reinforcing plates 21 and 22 are respectively joined facing each other, and the joined portions are welded W in this state. And the suspension arm main body 20a is formed. Thereafter, the socket 20b constituting the joint connecting portion 8 is attached to one end of the suspension arm main body 20a by welding or the like.
The boss 20c constituting the vehicle body attachment portion 9 is attached to the other end of the suspension arm body portion 20a by welding or the like, thereby completing the manufacture of the suspension arm 20.

Thus, the two reinforcing plates 21 and 22 are mounted inside each of the two arm components 5 and 6 having a substantially U-shaped cross section, and the hollow portion (closed cross section space portion) of the suspension arm body 20a. The suspension arm body 20a is arranged around the stabilizer mounting boss 25 where the maximum stress concentration occurs when a load is applied in the vehicle longitudinal direction during braking or when an impact force is input.
Are provided so as to extend along the longitudinal direction (the left and right direction of the vehicle body). Thereby, as shown in FIGS. 5 to 7, the hollow portion S is partitioned into _three closed sectional spaces S ₁ , S ₂ , and S ₃ by the reinforcing plates 21 and 22, and the stabilizer mounting boss portion 25 is formed. Is a so-called three-layer box-shaped cross-sectional structure.

In the present embodiment, the reinforcing plate 2
As shown in FIG. 4, joints 1 and 22 are provided so as to extend on both sides of the arm components 5 and 6 in the longitudinal direction with respect to the stabilizer attachment holes 11 of the arm components 5 and 6, respectively. Joint 8 (Socket 2
0b), the length α of the reinforcing plate portion extending between the boss 20 and the stabilizer mounting hole 11 and the vehicle body mounting portion 9 (the boss 20).
The length β of the reinforcing plate portion extending between c and c) is set substantially equal to the length L between the stabilizer mounting hole 11 and the joint connecting portion 8.

The steering arm 20 having the above-described structure is used.
Has the following advantages. First, since two reinforcing plates 21 and 22 are attached to the existing suspension arm 3 to obtain a three-layer box-shaped cross-sectional structure, the strength of the suspension arm 20 can be improved by this structure. Further, in the present embodiment, since the two reinforcing plates 21 and 22 are respectively mounted around the stabilizer mounting boss 25, the load applied to the suspension arm 20 during braking and impact force input is particularly high. It is possible to secure sufficient strength.

That is, during braking, the vehicle body mounting portion 8 of the suspension arm 20 is restrained on the vehicle body side,
Under a state where the stabilizer mounting boss portion 25 of the suspension arm 20 is constrained to the vehicle body via the stabilizer 10 and the rubber bush 12 attached to the vehicle body side at the mounting bracket 30, the braking force F ₁ the tire ground contact point Since the power is further transmitted to the joint connecting portion 8 through the ball joint (see FIG. 8), the peripheral edge of the stabilizer mounting boss 25 becomes the maximum stress concentration portion. Also,
When an impact force is input from the front, the suspension arm 2
0 with the vehicle body mounting portion 8 is restrained to the vehicle body side, under the state where the jointed portion 8 of the suspension arm 20 is constrained by the tire ground contact point, since the impact load F ₂ is applied from the stabilizer 10 (see FIG. 9 Accordingly, the peripheral edge of the stabilizer mounting boss portion 25 becomes the maximum stress concentration portion. However, in the present embodiment, the reinforcing plates 21 and 22 are provided around the stabilizer mounting boss portion 25 (particularly in the front-rear direction of the vehicle body) where the maximum stress concentration occurs when a load in the front-rear direction is applied at the time of braking or input of an impact force. The suspension arms 20 can be effectively reinforced by the presence of the reinforcing plates 21 and 22.

The arm members 5 and 6 have a so-called front-and-rear splitting structure (front-and-back alignment structure).
) Are brought to the upper and lower portions of the arm components 5, 6, so that the above-mentioned welded portion can be located at a position avoiding a stress concentration portion at the time of braking and inputting an impact force.

Moreover, while sufficient strength can be obtained as described above, the weight of the suspension arm 20 can be made relatively light. That is, two relatively small and lightweight reinforcing plates 21 and 2 are added to the existing suspension arm 3 in which the thickness of the arm components 5 and 6 is not increased.
Since only 2 is provided, the amount of increase in weight necessary for improving the strength can be smaller than when the plate thickness is increased. For example, when the reinforcing plates 21 and 22 are used, the weight can be reduced by about 10% as compared with the case where the thickness of the arm components 5 and 6 is increased for reinforcement. is there. In addition, since the weight of the suspension arm 20 can be reduced, steering stability can be improved by reducing the unsprung weight of the suspension.

Further, the lengths α and β of the reinforcing plate portions of the reinforcing plates 21 and 22 are set to be substantially the same as the length L between the stabilizer mounting hole 11 and the joint connecting portion 8. It is possible to efficiently reinforce the load in the vehicle longitudinal direction acting on the suspension arm 20 from the stabilizer 10 when an impact force is input or the like. The reason is as follows. First, as described above, the point where the maximum stress occurs when a load is applied to the suspension arm 20 during braking or impact force input is the periphery of the stabilizer mounting hole 11, so that the stabilizer 10 is used as a torsion beam that receives a load in the vehicle longitudinal direction. In order to reinforce the I-shaped suspension arm 20 provided, it is most effective and efficient to reinforce the stabilizer mounting hole 11 (periphery of the stabilizer mounting portion) at the center. In this case, there is no need to reinforce the periphery of the vehicle body mounting portion 9. Therefore, by setting α ≒ β ≒ L as the dimensional condition of the reinforcing plates 21 and 22, effective and efficient reinforcement can be performed with a minimum increase in weight.

If the reinforcing plates 21 and 22 are dimensioned so as to extend to the vicinity of the vehicle body mounting portion 9, useless reinforcement is performed for an extra portion to which only a relatively small load is applied, thereby reducing the weight. This causes a problem that causes an increase. In addition, a structure in which the reinforcing plates 21 and 22 are arranged in close contact with the respective substrate portions 23 of the arm components 5 and 6 is also conceivable, but the stabilizer mounting hole 11 is formed in the arm components 5 and 6 by drawing. Since the suspension arm 20 does not have a flat portion around the stabilizer mounting hole 11 and has a small arc shape (see FIG. 5), the reinforcing plate 21 is shaped to be in close contact with the arm components 5 and 6. , 22 are extremely difficult to manufacture. In order to increase the arc shape, the vertical width of the suspension arm 20 must be increased. However, such an arrangement causes problems such as interference with peripheral components, an increase in the weight of the suspension arm 20, and an increase in cost.

Each of the reinforcing plates 21 and 22 has an engaging hole 29 and a flange portion 28 for engaging with the stabilizer mounting boss portion 25 of the arm component member 5 or 6 having the inclined surface 26 having a truncated cone shape. Therefore, the reinforcing plates 21 and 22 can be positioned with respect to the arm components 5 and 6 by using these. Specifically, the stabilizer mounting boss 2
5 by engaging (fitting) the engagement holes 29 of the reinforcing plates 21 and 22 with the inclined surface 26 of the truncated cone shape of FIG. it can be positioned in the arrow P ₁ direction) in FIG. 4. Further, the upper and lower flange portions 28 of the reinforcing plates 21 and 22 are brought into contact with the inner surfaces of the upper and lower bent portions 24 of the arm components 5 and 6, so that the reinforcing plates 21 and 22 can move in the vertical direction with respect to the arm components 5 and 6. (Arrow P in FIG. 1)
Positioning in _two directions). Therefore, the reinforcing plates 21 and 22 can be used without using a separate member dedicated to positioning.
Can be easily and accurately positioned with respect to the arm components 5, 6, and the welding operation of the reinforcing plates 21, 22 to the arm components 5, 6 can be efficiently performed.

In addition, the flange portions 2 of the reinforcing plates 21 and 22
8 is welded to the arm members 5 and 6, so that the strength of the reinforcing plates 21 and 22 themselves can be improved. That is, since the upper and lower bent portions 24 of the arm components 5 and 6 are connected via the reinforcing plates 21 and 22 at locations near both sides of the stabilizer mounting hole 11, the periphery of the stabilizer mounting hole 11 where the maximum stress is generated. Is transmitted to the reinforcing plates 21 and 22, and the reinforcing plates 21 and 22
Thus, the structure is distributed to the upper and lower bent portions 24 of the arm constituent members 5 and 6, and the strength is improved.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment.
Various modifications and changes are possible based on the technical concept of the present invention. For example, in the above-described embodiment, the suspension arm body 20a is formed by using the two reinforcing plates 21 and 22.
Is divided into three closed section spaces S ₁ , S ₂ and S ₃ , but the hollow section S of the suspension arm 2 is partitioned into two closed section spaces by using a single reinforcing plate. Alternatively, the hollow portion S of the suspension arm 2 may be partitioned into four or more closed sectional spaces by using three or more reinforcing plates.

[0025]

According to the first aspect of the present invention, a reinforcing plate extending along the longitudinal direction of the suspension arm main body is disposed in the hollow portion of the suspension arm main body, and at least the hollow portion of the suspension arm main body is provided by the reinforcing plate. 2
A multi-layer box-shaped cross-section structure is defined by dividing the space into two or more closed cross-section spaces. Therefore, a multi-layer box-shaped cross-section structure is provided in an I-type suspension arm in which the stabilizer is provided as a torsion beam receiving a load in the vehicle longitudinal direction. Thus, the strength of the suspension arm can be improved. In addition, since it is only necessary to attach the reinforcing plate to the existing suspension arm without increasing the thickness of the arm components, the increase in the weight of the suspension arm can be suppressed.

According to a second aspect of the present invention, a reinforcing plate is mounted inside each of two arm components having a substantially U-shaped cross section, and two reinforcing plates are disposed in the hollow portion. Since the hollow portion of the suspension arm body is partitioned into three closed sectional spaces, the suspension arm body has a three-layer box-shaped sectional structure,
Thus, the strength of the suspension arm can be sufficiently improved without increasing the thickness of the arm component. In addition, it is possible to form a suspension arm body by combining two arm component members (the same parts) having substantially the same U-shaped cross section with the same dimensions and shape.
Since it is possible to use parts (common parts) of the same size and shape for the two reinforcing plates, it is possible to use only one forming die for the arm component member and one forming die for the reinforcing plate. Can save money.

According to a third aspect of the present invention, a reinforcing plate is provided so as to extend to both sides in the longitudinal direction of the arm component with respect to the stabilizer mounting hole of the arm component, and the stabilizer mounting hole and the vehicle body are provided. The reinforcing plate portion extending between the mounting portion and the stabilizer is set to be approximately the same length as the length between the stabilizer mounting hole and the joint connection portion. The boss for mounting the stabilizer, where the maximum stress concentration occurs when it is done, can be focused and efficiently reinforced, and efficiently and effectively against the load in the longitudinal direction of the vehicle body acting on the suspension arm from the stabilizer Reinforcement can be performed.

According to a fourth aspect of the present invention, the periphery of the stabilizer mounting boss portion provided on the arm component member for forming the stabilizer mounting hole is formed as an inclined surface while engaging with the inclined surface. A relative hole is provided between the arm member and the reinforcing plate by providing a mating hole in the reinforcing plate and engaging the engaging hole of the reinforcing plate with the inclined surface of the stabilizer mounting boss of the arm member. Therefore, when assembling the reinforcing plate to the arm member, the arm member is reinforced by the positioning action by the engagement of the engaging hole of the reinforcing plate with the inclined surface of the stabilizer mounting boss. Positioning of the plate in the front-rear direction can be performed easily and accurately.

According to the fifth aspect of the present invention, a flange portion is provided on the reinforcing plate, and the flange portion of the reinforcing plate is fixed by abutting the inner surface of the arm member. The abutting of the flange surface of the plate with the inner surface of the arm component enables easy and accurate positioning of the reinforcing plate with respect to the arm component in the up-down direction, thereby ensuring the alignment between the arm component and the reinforcing plate. Thus, the work of fixing the reinforcing plate to the arm constituent member (for example, welding work, etc.) can also be reliably performed. Further, since the flange portion of the reinforcing plate abuts and is fixed to the inner surface of the arm component member, the strength of the reinforcing plate itself can be improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a suspension arm according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the suspension arm showing a state in which a reinforcing plate is attached to an arm component.

FIG. 3 is a front view of a suspension arm.

FIG. 4 is a plan view of a suspension arm.

FIG. 5 is an enlarged sectional view taken along line AA in FIG. 3;

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

FIG. 7 is an enlarged sectional view taken along line CC in FIG. 3;

FIG. 8 is a plan view showing a load acting on a suspension arm during braking.

FIG. 9 is a plan view showing a load acting on a suspension arm when an impact force is input.

FIG. 10 is a perspective view showing a configuration of a strut type suspension.

FIG. 11 is a perspective view showing a conventional suspension arm used for a strut type suspension.

FIG. 12 is an enlarged sectional view taken along line DD in FIG. 11;

FIG. 13 is an enlarged sectional view taken along line EE in FIG. 11;

FIG. 14 is a plan view showing a deformation mode of the suspension arm during braking.

FIG. 15 is a plan view showing a deformation mode of the suspension arm when an impact force is input.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Strut 4 Body 5, 6 Arm component 8 Joint connection part 9 Body mounting part 7 Suspension arm main body 10 Stabilizer 11 Stabilizer mounting hole 20 Suspension arm 20a Suspension arm main body part 20b Socket (joint connection part) 20c Boss (body mounting part) 21, 22 reinforcement plate 23 base 24 bent portion 25 for the stabilizer mounting boss portion 26 inclined surface 27 the substrate portion 28 the flange portion 29 engaging hole alpha, the length of the β reinforcing plate portion F ₁ braking force F ₂ impact load L stabilizer mounting Length between hole and joint joint S hollow part (closed section space) S ₁ , S ₂ , S ₃ closed section space W, W ₁ , W ₂ welding

Claims (5)

[Claims] 1. A suspension arm body in which two arm components having a substantially U-shaped cross section are joined to each other so as to form a hollow section having a closed cross section, and one end of the suspension arm body is connected to a wheel side via a joint. A joint connecting portion provided at one end of the suspension arm main body for mounting to the vehicle body, and a vehicle body mounting portion provided at the other end of the suspension arm main body for mounting the other end of the suspension arm main body to the vehicle body side. And a suspension arm having a stabilizer mounting hole for mounting a stabilizer at a position of the suspension arm main body between the joint connecting portion and the vehicle body mounting portion, wherein a length of the suspension arm main body is set in a hollow portion of the suspension arm main body. A reinforcing plate extending along the direction A suspension arm, wherein the reinforcing plate partitions the hollow portion of the suspension arm body into at least two or more closed sectional spaces. 2. A reinforcing plate is mounted inside each of the two arm components having a substantially U-shaped cross section, and two
The suspension arm according to claim 1, wherein the hollow portion of the suspension arm body is partitioned into three closed cross-sectional spaces by disposing two reinforcing plates. 3. The reinforcing plate is disposed so as to extend on both sides in the longitudinal direction of the arm component with the stabilizer mounting hole as a center, and between the stabilizer mounting hole and the joint connecting portion. And the length of the reinforcing plate portion extending between the stabilizer mounting hole and the vehicle body mounting portion is substantially the same as the length between the stabilizer mounting hole and the joint connecting portion. The suspension arm according to claim 1, wherein the suspension arm is set to: 4. An inclined surface is formed around a stabilizer mounting boss provided on the arm member for forming the stabilizer mounting hole, and an engaging hole engaging with the inclined surface is formed on the reinforcing plate. And the engaging hole of the reinforcing plate is engaged with the inclined surface of the stabilizer mounting boss portion of the arm component so as to perform relative positioning between the arm component and the reinforcing plate. The suspension arm according to any one of claims 1 to 3, wherein: 5. The reinforcing plate according to claim 1, wherein a flange is provided on the reinforcing plate, and the flange of the reinforcing plate is abutted on an inner surface of the arm member to be fixed. The suspension arm according to claim 1.