JP3208399B2 - Suspension arm members - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a member for a suspension arm of an automobile or the like.

[0002] In this specification, the term "aluminum" is used to include its alloy.

[0003]

2. Description of the Related Art As shown in FIG. 10, for example, a suspension arm member (50) constituting an automobile suspension arm such as an upper arm, a lower arm, a torsion bar, a trailing arm, etc. , Rod-shaped or other shaped member body (51)
And a cylindrical anti-vibration bush (4
And a bush mounting portion (53) formed with a circular mounting hole (52) for mounting the same. As the bush (40), a shaft member (41) located at the center and a bush member (41) are arranged around the shaft member (41) and the outer diameter is slightly smaller than the diameter of the mounting hole (52). The bush (40) is connected to the mounting hole (52) by connecting a rigid sleeve (42), which is set to be large, with a rubber elastic body (41) interposed therebetween. By press-fitting, it is mounted and fixed to the suspension arm member (50).

However, the press-fit type bush mounting portion (53) as described above has a mounting hole (52) and a bush (4).
Strict dimensional accuracy is required between 0 and 0), and special processing is required to finish the inner peripheral surface of the mounting hole (52) to the required dimensional accuracy.

Conventionally, the above-mentioned suspension arm member (50) is manufactured entirely by a sheet metal press using an iron-based material, or when the member body is long, it is made of a pipe or plate. (51) and a bush mounting part (5
3) and was manufactured by welding. However, iron-based materials have the drawback that they are heavy and, in the case of welding, costly.

Therefore, recently, a suspension arm member made of a lightweight aluminum material has been used. In the case of aluminum, since extensibility is good, an extruded profile in which the member main body (51) and the bush mounting portion (53) are integrally formed is exclusively used, and this extruded profile is moved in the extrusion direction. The slice is cut into a predetermined thickness to form a suspension arm member.

However, the member body (5)
When 1) and the bush mounting portion (53) are integrally formed by extrusion, the direction of the bush mounting portion (53) with respect to the member main body (51) is uniquely determined, and this can be changed. Did not. In addition, there are limits to the degree of design freedom that can be taken, such as the shape of the suspension arm member (50) and the length of the member body (51).

As described above, it is conceivable that the member main body (51) and the bush mounting portion (53) are separately manufactured. However, even in this case, the bush mounting portion (5) may be used.
3) The work of press-fitting and fixing the bush (40) into the mounting hole (52) and the work of connecting and fixing these member main body (51) and the bush mounting portion (53) must be performed separately, so that production efficiency is increased. Was bad.

The present invention has been made in view of the above technical background, and not only can the strictness of the dimensional accuracy between the mounting hole and the bush be reduced, but also the direction of the bush mounting portion with respect to the member body can be changed. It is another object of the present invention to provide a suspension arm member that can increase the degree of freedom in design with respect to the overall shape, the length of the member body, and the like, and can be manufactured efficiently.

[0010]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a suspension arm for connecting a member main body and a bush mounting member separate from the member main body, which mounts a cylindrical bush. A member, wherein the bush mounting member includes a holding portion into which the bush is fitted, and an opening extending in an axial direction is formed in a part of the holding portion in a circumferential direction, and the holding portion is formed in the opening. On the other hand, a pair of connecting portions projecting on the outer peripheral surface are provided on both sides in the circumferential direction of the opening in a circumferentially opposed arrangement, and the connecting portions are formed by using uneven fitting. The inner body of the holding portion is tightly attached to the outer circumferential surface of the bush, and the bushing is configured to fit and fix the bush in the holding portion. In the bush connection planned portion, a through hole is provided, and the fitting convex portion constituting the coupling structure is inserted into the through hole to fit into the corresponding fitting concave portion, and both coupling portions are coupled, The member main body is sandwiched between the two connecting portions in the connected state, and the member main body and the bush mounting member are connected.

According to this, the strict dimensional accuracy of the gap between the bush and the holding portion is not required as compared with the conventional product as described above, and the inner peripheral surface of the holding portion of the bush mounting member has the required dimensional accuracy. Special processing for finishing may be unnecessary.

In addition, when the connecting operation of the connecting portion is performed, the bush is fitted and fixed in the holding portion of the bush mounting member, and the fitting convex portion forming the connecting structure is provided at the portion of the member body where the bush is to be connected. The two connecting portions are connected to each other by being inserted into the through holes and fitted in the corresponding fitting concave portions, and the member body is sandwiched between the two connecting portions in the connected state. Therefore, by the operation of connecting the connecting portions, the operation of fitting and fixing the bush and the operation of connecting the member main bodies can be performed at the same time, and the production efficiency is improved. In addition, since the member main body is connected in a state where the fitting convex portion is inserted into the through hole provided in the bush connection planned portion, the member main body is strongly prevented from coming off from between the two connection portions.

Further, when a plurality of bush mounting members are connected to the member main body as in the above-mentioned conventional product, the bush mounting members are sandwiched by changing the directions of the bush mounting members with respect to the member main body. Thereby, the relative angle in the axial direction of the bush mounted on each bush mounting member can be arbitrarily set.

Further, since the member main body and the bush mounting member are manufactured separately, the degree of freedom in design that can be adopted with respect to the shape of the suspension arm member, the length of the member main body, and the like is increased.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a suspension arm member of an automobile will be described in detail with reference to the drawings.

FIGS. 1 to 5 show an embodiment (first embodiment) of the present invention. In these figures, (A) is a member for a suspension arm of an automobile. As shown in FIG. 5, the suspension arm member (A) includes a rod-shaped member main body (1) and a total of two tightening-type bush mounting members (10) connected to both ends in the longitudinal direction thereof. (10).

As shown in FIG. 1, the member main body (1) is made of a steel material having an H-shaped cross section, and has a connecting plate (1a) connecting both side plates (1b) and (1b). ) Are connected to the bush mounting members (10) and (10). Both ends of the connecting plate portion (1a) are inserted into crushed portions (18) (18) to be described later.
Each of the rectangular through holes (2) and (2) is formed.

On the other hand, each of the aforementioned bush mounting members (10)
Are manufactured by slicing an aluminum extruded material into a desired thickness in the extrusion direction. The bush mounting member (10) mounts a cylindrical anti-vibration bush (40). The bush mounting member (10) includes a cylindrical holder (11) into which the bush (40) is fitted.
An opening (12) extending in the axial direction is formed by dividing one portion in the circumferential direction of 1). Therefore, this opening (1)
In 2), the holding portion (11) can be opened in an expanded state.

Further, on both sides of the opening (12) in the circumferential direction, a pair of rectangular cross sections projecting on the outer peripheral surface over the entire area in the axial direction at both opening edges of the opening (12). Coupling portions (13) and (14) are provided in a circumferentially opposed arrangement.

The two connecting portions (13) and (14) are connected via a connecting structure utilizing a concave-convex fitting, and are configured as follows. That is, each coupling part (13)
On one of the mutually facing surfaces of (14), crushed portions (18) and (18) having a rectangular cross section as fitting projections constituting the coupling structure, extending in the axial direction in two rows inside and outside, are protruded, In the other of the opposing surfaces, biting grooves (19) and (19) serving as fitting recesses corresponding to the fitting protrusions, which extend in the axial direction in two rows inside and outside at positions corresponding to the crushed portions (18). Are formed. These crushed portions (18) and bite grooves (19)
With the crushed portion (18) fitted in the bite groove (19), the bite groove (19) is filled with the crushed portion (18) while being plastically deformed, so that the two connecting portions (13) and (14) are connected. Thus, the opening (12) plays a role of maintaining the closed state. For this reason, the biting groove (19) is formed with an enlarged portion (19a) having a larger groove width than the upper and lower ends in the depth direction and thus a larger opening area at an intermediate portion in the depth direction, while being crushed. The protruding height of the portion (18) is the depth of the bite groove (19) and the connecting plate portion (1a) of the member main body (1).
And the cross-sectional area is set to be substantially the same as the cross-sectional area of the digging groove (19), and when the opening (12) is closed, the crushed portion (18) deformed and filled is formed by the enlarged portion. (19a) is sufficiently entangled to strongly prevent separation of the two connecting portions (13) and (14).

The connecting plate of the member main body (1) extends over the entire area in the axial direction on the surface of the coupling portions (13) and (14) where the biting groove (19) is formed. An L-shaped recess (17) recessed from the vicinity of the base end to the tip corresponding to the thickness of the portion (1a) is formed.
3) When the member (14) is in the connected state, the member body (1)
The end of the connecting plate (1a) is arranged in the recess (17) so that the opening (12) can be closed.

The crushed portions (18) and (18), the bite grooves (19) and (19), and the recessed portion (17) are formed when the bush mounting member (10) is extruded.

Next, the suspension arm member (A) of this embodiment will be described based on its manufacturing method.

First, as shown in FIG.
In FIG. 2, the cylindrical bush (40) is inserted into the holding part (11) as shown in FIG. 2 with the holding part (11) expanded so that the inner peripheral length of the holding part (11) is substantially increased. . In parallel with this, the connecting plate (1) of the member body (1)
a) Insert the end between the opposing surfaces of the coupling portions (13) and (14). If necessary, the connecting plate portion (1) of the member body (1) may be used.
A vibration isolator (not shown ) may be interposed between a) and the coupling portions (13) and (14).

In the present embodiment, the bush (40) includes a support member (41) located substantially at the center and a cylindrical rigid sleeve (42) disposed around the support member (41). , A rubber elastic body (4
The solid type connected by 3) is used, and the outer diameter of the rigid sleeve (42) is equal to the holding portion (1).
The holding portion (1) when the opening (12) of (1) is closed
It is set slightly larger than the inner diameter of 1). Thus,
Since the holding portion (11) is expanded at the opening (12), the bush (40) can be very easily held by the holding portion (1).
1) can be loaded in.

Next, when the two joints (13) and (14) are pressed in the approaching direction by a press or the like to close the opening (12), the crushed portions (18) (1) of one of the joints (14) are pressed.
8) penetrates the through holes (2) and (2) of the connecting plate portion (1a) and fits into the cut-in grooves (19) and (19) of the other connecting portion (13), as shown in FIG. Before the closing of the opening (12), the tip of the crushed part (18) (18)
9) Contact the bottom surface of (19).

In this state, both connecting portions (13) (1)
When 4) is pressed in the contact direction, as shown in FIG.
The crushed portion (18) is plastically deformed into a crushed shape along the shape of the digging groove (19) and the digging groove (1) including the enlarged portion (19a)
9), the mutually opposing surfaces of the coupling portions (13) and (14) approach in the close contact direction, and the opening (12) is reduced and eventually becomes closed. At the same time, the bush mounting member (10)
The inner peripheral surface of the holding portion (11) closely contacts the outer peripheral surface of the bush (40), and the bush (40) is in a state of being tightly wound. At the same time, the mutually opposing surfaces of the coupling portions (13) and (14) come into close contact with both surfaces of the connecting plate portion (1a) of the member main body (1), so that the member main body (1) is firmly clamped.

In this state, even if the pressing force applied to the coupling portions (13) and (14) is released, the crushed portion (18) deformed and filled in the digging groove (19) becomes the enlarged portion (19a) of the digging groove. The two joints (13) and (14) are strongly prevented from being separated by being sufficiently bitten, and the bush (40) is securely fastened in the holding portion (11) and the two joints (13) of the member body (1). 13) (1
4) The sandwiched and fixed state is maintained. Also, in this state, the member body (1) is sandwiched between the through holes (2) and (2) with the crushed portions (18) and (18) inserted therethrough. 14) The escape from the space is strongly prevented. If necessary, the interface between the joints (13) and (14) and the interface between the joints (13) and (14) and the member body (1) may be welded or joined by laser welding, friction stir welding, or the like, or a sealant, Loctite, or the like. Glue with the adhesive of
3) The gap between (14) and (14) may be completely closed to reliably prevent intrusion of mud or water from the gap.

By connecting the bush mounting members (10) and (10) to both ends of the member body (1) as described above, the suspension arm shown in FIG. 5 is obtained.

FIGS. 6 and 7 show another embodiment (second embodiment) of the present invention. In these drawings, the same components as those in the first embodiment are denoted by the same reference numerals, and this embodiment will be described below focusing on differences from the first embodiment.

In this embodiment, the member main body (1) is made of a square pipe-shaped steel material having a hollow portion as shown in FIG. 7, and as shown in FIGS. 6 (a) and 6 (b). Two through holes (2), (2), and (2) are provided at one end of one of the four side walls constituting the peripheral wall and at the other end of one of the side walls adjacent to the side wall. (2) is perforated. Further, a total of two bush mounting members (10) (10) connected to both ends of the member main body (1) have the same configuration as in the first embodiment.

The connecting operation between the member body (1) and the bush mounting member (10) having such a configuration is performed in the same manner as in the first embodiment. Briefly describing this, as shown in FIG. 7, the through hole (2) of the four side walls of the member body (1) is used.
The one end of the side wall where the hole is drilled is connected to the joining portions (13) and (14).
And the bush (40) is inserted into the holding portion (11) of the bush mounting member (10) whose inner peripheral length is substantially increased. And both connecting parts (13)
(14) is pressed in the approaching direction, and one of the joining portions (14) is pressed.
The crushed portions (18) and (18) of the other are inserted through the through holes (2) and (2), and the bite grooves (19) and (19) of the other connecting portion (13) are inserted.
And further press the both joints (13) and (14) in the close contact direction to plastically deform the crushed part (18) in the bite groove (19) to join the two joints (13) and (14). Let it.

By connecting the bush mounting members (10) and (10) to both ends of the member body (1) in this manner, as shown in FIGS. The inner peripheral surface of the holding portion (11) of 1) is a bush (4).
The bush (40) is tightly wound in close contact with the outer peripheral surface of (0), and at the same time, the connecting portions (13) and (14).
The surfaces facing each other are in close contact with the inner and outer surfaces of the side wall of the member body (1), so that the member body (1) is firmly clamped. Further, the crushed portion (18) is inserted and inserted into the through hole (2), and the member main body (1) is connected to both the connecting portions (13) and (14).
Is firmly prevented.

In the first embodiment shown in FIGS. 1 to 5, the suspension arm member (A) has a bush mounting member having both ends of the member body (1) as shown in FIG. In a state of being sandwiched between the coupling portions (13) and (14) of (10), the relative angle between the two bush mounting members (10) and (10) is zero degree, that is, both bush mounting members (10) and (1).
0) has the same axial direction. On the other hand, in the second embodiment shown in FIGS. 6 and 7, the suspension arm member (A) is composed of two members at both ends of the member body (1) as shown in FIGS. The relative angle between the bush mounting members (10) and (10) is 90 degrees. As described above, according to the present invention, the bush mounting members (10) and (10) are sandwiched by changing the directions of the bush mounting members (10) and (10) with respect to the member main body (1), whereby each bush mounting member (1) is mounted.
The relative angles in the axial direction of the bushes (40) and (40) mounted on 0) and (10) can be set to arbitrary angles such as zero degree and 90 degrees.

FIGS. 8 and 9 show still another embodiment (third embodiment) of the present invention. In addition,
In these drawings, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and this embodiment will be briefly described below focusing on differences from the first embodiment and the second embodiment. explain.

In the suspension arm member (A) of this embodiment, a total of three bush mounting members (10), (10), (10) are connected to the member body (1) as shown in FIG. Things. These bush mounting members (10) (10) have the same configuration as in the first embodiment. On the other hand, as the member main body (1), as shown in FIG. 8, a substantially A-shaped flat plate-shaped steel material having ribs (1c), (1c), and (1c) at edges is used. Two through holes (2), (2), and (2) (2) are formed in both end portions of the member main body (1) on the lower end side in the figure. Further, at the end of the member body (1) on the upper end side in FIG.
The rising connection piece (3) connected to the bush mounting member (10) is integrally joined by welding (welded portion 4),
Two through holes (2) and (2) are formed in the rising connection piece (3).

The bush mounting member (10) is inserted into three portions of the member main body (1) where the through holes (2) (2), (2) (2), (2) and (2) are formed. ) Is the first
Then, the suspension arm member (A) shown in FIG. 9 is manufactured by being connected in the same procedure as in the second embodiment.

In the above three embodiments, the bush mounting member (10) is provided on one of the connecting portions (14) as a squeezed fitting protrusion projecting toward the other connecting portion (13). Part (18) is provided while the other coupling part (1
At a position corresponding to the crushed portion (18) of 3), a bite groove (19) as a fitting concave portion having an enlarged portion (19a) having an opening area increased in a depth direction is formed,
The joints (13) and (14) are joined by fitting the crushed portion (18) into the cut-in groove (19) and biting into the enlarged portion (19a) so as to be plastically deformed in a retaining state. The connection part (13) (1)
4) It is possible to directly connect each other, and it is possible to efficiently perform the connecting operation, and to obtain a stronger connecting strength. As a result, the connection work with the member main body (1) can be performed efficiently, and a strong connection strength can be obtained.

In the above three embodiments, the coupling structure of the coupling portions (13) and (14) of the bush mounting member (10) is such that any one of the coupling portions (13) and (14) has a crushed portion. (18) is a structure in which a bite groove (19) is provided on the other side and these two connecting portions (1 3 ) (1 4 ) are directly connected. However, the present invention is not limited to this.
The joints (13) and (14) are provided with crushed portions (18) or bite grooves (19), and between the joints (13) and (14),
A structure in which a coupling body (not shown) having a cut-out groove or a crushed portion corresponding to the crushed portion (18) or the cut-out groove (19) may be connected. In this case, in the member main body (1), one of the coupling portions (13) and (14) and the crushed portion (18) of the coupling body is provided in the through hole (2) provided at the portion where the bush is to be coupled. It is connected to the bush mounting member (10) in a state where it is inserted.

Further, as a vibration isolating bush (40), a shaft member (41) positioned substantially at the center, and the shaft member (4).
A cylindrical rigid sleeve (42) disposed around 1).
Shows a solid type which is interposed therebetween and connected by a rubber elastic body (43), but has no outer rigid sleeve (42) and has a rubber elastic body (43).
Liquid may be sealed inside from an injection port provided on the outer peripheral surface, and a vibration-proof function may be exhibited by the sealed liquid. In this case, if the joining operation of the joining portions (13) and (14) by pressing is performed in a liquid, the liquid is filled in the rubber elastic body (43) and the joining portion (13) is formed.
The coupling operation of (14) can be performed at the same time, and there is an effect that the step can be omitted.

Further, while an iron-based material such as steel is used for the member body (1), aluminum is used for the bush mounting member (10), but other materials are used for the member body (1) and the bush mounting member (10). For example, a synthetic resin material may be used, or the same kind of material may be combined. When an iron-based material is used, it is preferable to use a material that has been subjected to rust prevention and corrosion treatment.

Also, the suspension arm member (A) in which two or three bush mounting members (10) are connected to the member main body (1) is shown, but one bush mounting member is mounted on the member main body (1). The member (10) or four or more bush mounting members (10) may be connected. Further, the shape of the member body (1) is not limited to the above three embodiments.

[0043]

According to the present invention, as described above, the member body,
A member for a suspension arm, to which a cylindrical bush is attached, to which a bush attaching member separate from the member main body is connected, wherein the bush attaching member has a holding portion into which the bush is fitted. In addition to the above, an opening extending in the axial direction is formed in a part of the circumferential direction of the holding portion, and the holding portion can be opened in an expanded state in the opening, and on both sides in the circumferential direction of the opening. A pair of connecting portions protruding on the outer peripheral surface are provided in a circumferentially opposed arrangement, and these connecting portions are connected via a connecting structure using concave-convex fitting, so that the inner peripheral surface of the holding portion becomes the bush. The bushing is of a winding type in which the bush is fitted and fixed in the holding portion in close contact with the outer peripheral surface of the bushing. When Sandwiching member and the unnecessary strict dimensional accuracy of the gap Nashie may no unnecessary special machining for finishing the required dimensional accuracy holding inner peripheral surface of the bush mounting member.

Further, a through hole is provided at a portion of the member main body to be connected to the bush, and a fitting convex portion forming the coupling structure is inserted through the through hole to fit into a corresponding fitting concave portion. The two connecting portions are connected, and the main body of the member is sandwiched between the two connecting portions in the connected state, so that the main body of the member and the bush mounting member are connected. The attachment and fixing operation and the connection operation of the member main body can be performed simultaneously, and a member for a suspension arm that can be manufactured efficiently can be provided. Moreover, since the member main body is connected in a state in which the fitting convex portion is inserted into the through hole provided in the bush connection planned portion, the member main body is strongly prevented from coming off between the two connection portions, It is possible to provide a suspension arm member in which the member main body and the bush mounting member are firmly connected.

In the case where a plurality of bush mounting members are connected to the member main body, each bush mounting member can be mounted by changing the direction in which the bush mounting members are mounted on the member main body. The relative angle in the axial direction of the bush attached to the member can be set arbitrarily, without changing the suspension arm layout specification etc.
A suspension arm that can easily cope with this can be provided.

Naturally, since the member main body and the bush mounting member can be manufactured separately, the degree of freedom in designing the shape of the suspension arm member and the length of the member main body can be increased, and the two can be connected by welding. However, the connection work is also simplified, and a member for a suspension arm with extremely high production efficiency can be provided.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a suspension arm member according to an embodiment (first embodiment) of the present invention, which is separated into a member main body and a bush mounting member.

FIG. 2 is a cross-sectional view showing a state in which a bush is loaded into a holding portion of the bush mounting member and one end of the member main body is inserted between both connecting portions.

FIG. 3 is a cross-sectional view showing a state where both joints of the bush mounting member are pressed in a contact direction.

FIG. 4 is a cross-sectional view of a state in which both connecting portions of the bush mounting member are further pressed, the bush is wound around the bush mounting member, and one end of the member main body is clamped.

FIG. 5A is an overall plan view of a suspension arm connecting a member main body and a bush mounting member, and FIG. 5B is a front view of the same.

FIG. 6 shows a member for a suspension arm according to another embodiment (second embodiment) of the present invention.
(A) is a plan view of the member body, (B) is a front view of the same,
(C) is an overall plan view of the suspension arm connecting the member body and the bush mounting member, and (D) is a front view of the same.

FIG. 7 is a perspective view showing the suspension arm member separated into a member main body and a bush mounting member.

FIG. 8 shows a suspension arm member according to yet another embodiment (third embodiment) of the present invention.
(A) is a plan view of the member body, (B) is VIII-VI in (A)
FIG. 2 is a sectional view taken along line II.

FIG. 9 is an overall plan view of a suspension arm connecting a member main body and a bush mounting member.

FIG. 10 is a perspective view of a suspension arm using a conventional suspension arm member.

[Explanation of symbols]

 A: Suspension arm member 1 ... Member main body 2 ... Through hole 10 ... Bush mounting member 11 ... Holding part 12 ... Opening part 13, 14 ... Coupling part 18 ... Crushed part (fitting convex part) 19 ... Biting groove (fitting) (Recess) 19a: enlarged portion 40: anti-vibration bush

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masatoshi Enomoto 6,224 Kaiyama-cho, Sakai City Showa Aluminum Co., Ltd. 72) Inventor Noriyuki Iwakiji 6, 224 Kaiyama-cho, Sakai City Inside Showa Aluminum Co., Ltd. (56) References Japanese Unexamined Patent Publication No. Sho 61-233214 (JP, A) Hei 4-109608 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60G 7/00 B60G 7/02

Claims (1)

(57) [Claims] A member body (1) and a cylindrical bush (4)
0) for mounting a suspension arm (A) to which a bush mounting member (10) separate from the member main body (1) is connected. ) Includes a holding portion (11) into which the bush (40) is fitted, and an opening (12) extending in the axial direction is formed in a part of the holding portion (11) in the circumferential direction. In 12), the holding portion (11) can be opened in an expanded state, while the opening (12)
A pair of connecting parts (13) protruding on the outer peripheral surface on both sides in the circumferential direction of
(14) are provided in the circumferentially opposed arrangement, and these connecting portions (1
3) Since (14) is connected via a connection structure using uneven fitting, the inner peripheral surface of the holding portion (11) is in close contact with the outer peripheral surface of the bush (40), and the bush (40) The main body (1) is provided with a through hole (2) at a portion where the bush is to be connected, and is provided with a through hole (2). The fitting projections (18) are inserted through the through holes (2) to fit into the corresponding fitting recesses (19), so that the two connecting portions (13) and (14) are connected. A suspension arm characterized in that a member main body (1) is sandwiched between two connecting portions (13) and (14) in a connected state, and the member main body (1) and a bush mounting member (10) are connected. Parts.