KR20240146889A - Lower arm for vehicle - Google Patents

Abstract

The present invention relates to a vehicle lower arm that enables common use of various springs and implements a high-strength and high-rigidity structure to improve durability. In the present invention, a vehicle lower arm is introduced, characterized in that a spring support portion on which a spring is supported is formed between one end and the other end of the lower arm, and the spring support portion is formed in a shape that protrudes toward the spring.

Description

Lower arm for vehicle

The present invention relates to a vehicle lower arm that enables common use of various springs and implements a high-strength and high-rigidity structure to improve durability.

The suspension consists of a shock absorber, a stabilizer, and a rigid lower arm and upper arm that support the vehicle load coming through the wheel knuckle.

The above lower arm supports the shock absorber and spring and acts as a link connecting the wheel knuckle and the frame.

Additionally, a spring support part is formed in a groove shape in the middle of the lower arm, and a spring is supported by being inserted into the spring support part.

However, this type of spring support structure has a problem in that the spring interferes with the side wall when a large spring is applied or a spring other than a coil spring is applied due to the side wall surrounding the spring support part.

In addition, the lower arm requires a high-rigidity and high-strength structure to support the load of the vehicle, but the existing lower arm structure had limitations in stably supporting the load of the vehicle as well as bending from the irregular repetitive load of the spring and twisting due to centrifugal force generated when turning.

The matters described as background technology above are only intended to enhance understanding of the background of the present invention, and should not be taken as an acknowledgment that they correspond to prior art already known to those skilled in the art.

KR 10-2261281 B

The present invention has been made to solve the problems described above, and provides a vehicle lower arm that can be used with various springs.

Another object of the present invention is to provide a vehicle lower arm having a high strength and high rigidity structure to improve durability.

The configuration of the present invention to achieve the above purpose may be characterized in that a spring support portion is formed between one end and the other end of the lower arm, on which a spring is supported, and the spring support portion is formed in a shape that protrudes toward the spring.

The above spring support member is formed in a plate shape; the side walls on the left and right of the spring support member are formed in a shape that is bent downward; and the side walls can be formed by connecting one end of the lower arm to the other end.

A flange may be formed in a shape that is laterally bent at the lower end of the side wall; an edge bending portion may be formed in a shape that is bent perpendicular to the flange at the outer end of the flange.

The above edge bending portion can be formed in the middle portion of the flange excluding one end and the other end of the lower arm.

A spring hole is formed by penetrating the spring support member; a hole bending member can be formed in a shape that is bent perpendicularly to the inner peripheral edge of the spring hole.

An anti-rotation hole is formed around the spring hole, so that a spring seat can be mounted in the spring hole and the anti-rotation hole.

The above lower arm can be manufactured by press forming.

Through the above-described problem-solving means, the present invention prevents the lower end of the spring from interfering with the lower arm even if the diameter of the spring is formed longer than the left-right widthwise length of the spring support portion by having the spring rest on the spring support portion protruding upward.

Therefore, it is possible to apply a large coil spring, and it is also possible to apply springs other than coil springs, so there is an advantage in that it is possible to use springs with various structures and shapes.

Furthermore, by forming a bending-shaped reinforcing structure in the edge of the lower arm and the spring hole of the spring support, the rigidity and strength of the lower arm are improved, thereby increasing durability.

Figure 1 is a drawing showing the shape of a lower arm according to the present invention.
Figure 2 is a cross-sectional view taken along line A-A of Figure 1.
Figure 3 is a drawing showing a shape in which a spring sheet is mounted on a lower arm according to the present invention.
Figure 4 is a drawing for explaining the structure in which the spring sheet of Figure 3 is mounted on the lower arm.
Figure 5 is a drawing showing a shape in which an air spring is mounted on a lower arm according to the present invention.
Figure 6 is a drawing for explaining the structure in which the air spring of Figure 5 is mounted on the lower arm.

Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Regardless of the drawing symbols, identical or similar components will be given the same reference numerals and redundant descriptions thereof will be omitted.

The suffixes "module" and "part" used for components in the following description are given or used interchangeably only for the convenience of writing the specification, and do not have distinct meanings or roles in themselves.

In describing the embodiments disclosed in this specification, if it is determined that a detailed description of a related known technology may obscure the gist of the embodiments disclosed in this specification, the detailed description thereof will be omitted. In addition, the attached drawings are only intended to facilitate easy understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and technical scope of the present invention.

Terms that include ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by the terms. The terms are used only to distinguish one component from another.

When it is said that a component is "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components in between. On the other hand, when it is said that a component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this specification, it should be understood that terms such as “comprises” or “has” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

A preferred embodiment of the present invention is described in detail with reference to the attached drawings as follows.

Figure 1 is a drawing illustrating the shape of a lower arm according to the present invention.

Referring to the drawings, the vehicle lower arm of the present invention may be formed with a spring support portion (101) formed between one end and the other end of the lower arm (100) on which a spring is supported, and the spring support portion (101) may be formed in a shape protruding toward the spring.

Specifically, the spring support member (101) is formed in a plate shape; the side walls (103) on the left and right sides of the spring support member (101) are formed in a shape that is bent downward; and the side walls (103) can be formed by connecting one end of the lower arm (100) to the other end.

For example, a body connection hole (117) is formed at one end of the lower arm (100), a mounting bush (119) is mounted, and a subframe is assembled by the mounting bush (119).

And, a wheel connection hole (121) is formed at the other end of the lower arm (100), and a knuckle is assembled into the wheel connection hole (121).

In addition, a shock absorber connection hole (123) is formed in the middle portion connecting the wheel connection hole (121) to the spring support member (101), and a shock absorber is assembled into the shock absorber connection hole (123).

In particular, a flat spring support member (101) is formed in the middle portion connecting the shock absorber connection hole (123) where the shock absorber is assembled to the body connection hole (117).

The above spring support member (101) is formed in a shape in which the side walls (103) are bent downward from the left and right edges thereof, so that the spring support member (101) is formed on the upper end of the left and right side walls (103), and thus the spring support member (101) is formed in a shape that protrudes upward from the lower arm (100), so that the bottom of the spring is secured and supported on the upper surface of the spring support member (101).

That is, by placing the spring on the spring support member (101) that protrudes upward, the spring support member (101) becomes open on all sides.

Accordingly, even if the diameter of the spring is formed longer than the left-right width direction of the spring support member (101), the lower end of the spring does not interfere with the lower arm (100), so that a coil spring of a large size can be applied, and also, in addition to the coil spring, application of other springs is possible, so that common use of springs having various structures and shapes is possible.

Meanwhile, Fig. 2 is a cross-sectional view taken along line A-A of Fig. 1.

Referring to FIGS. 1 and 2, a flange (105) may be formed in a shape that is laterally bent at the lower end of the side wall (103); and an edge bending portion (107) may be formed in a shape that is bent orthogonally to the flange (105) at the outer end of the flange (105).

Preferably, a flange (105) is formed by bending outwardly at the lower end of the left and right side walls (103).

And, an edge bending portion (107) is formed by bending upward at the outer end of the flange (105).

Accordingly, by reinforcing the edge portion of the lower arm (100) by the edge bending portion (107), the rigidity and strength of the lower arm (100) are improved, thereby increasing durability.

In addition, the edge bending portion (107) can be formed in the middle portion of the flange (105) excluding one end and the other end of the lower arm (100).

That is, a subframe is assembled at one end of the lower arm (100), and vehicle parts such as a shock absorber and a knuckle are assembled at the other end of the lower arm (100).

Accordingly, the edge bending portion (107) is not formed at one end and the other end of the lower arm (100), thereby preventing vehicle parts from interfering with the edge bending portion (107), while the edge bending portion (107) is formed only at the middle portion of the lower arm (100) where the spring support portion (101) is located, thereby reinforcing the rigidity and strength of the lower arm (100).

Accordingly, a structure that is robust against bending due to irregular repetitive load of the spring by the edge bending portion (107) and twisting due to centrifugal force generated when turning is implemented, thereby supporting the load of the vehicle more stably.

In addition, the present invention can form a spring hole (109) by penetrating the spring support member (101); and a hole bending member (111) can be formed in a shape that is bent perpendicularly to the inner peripheral edge of the spring hole (109).

For example, an oval-shaped spring hole (109) is formed in the middle of a spring support member (101), and a hole bending member (111) is formed by bending downward along the inner peripheral edge of the spring hole (109).

Accordingly, a structure that is robust against bending due to irregular repetitive load of the spring by the hole bending part (111) and twisting due to centrifugal force generated when turning is implemented, thereby supporting the load of the vehicle more stably.

In addition, an anti-rotation hole (113, 115) is formed around the spring hole (109), so that the spring sheet (200) can be mounted on the spring hole (109) and the anti-rotation hole (113, 115).

For example, FIG. 3 is a drawing showing a shape in which a spring sheet (200) is mounted on a lower arm (100) according to the present invention, and FIG. 4 is a drawing for explaining a structure in which the spring sheet (200) of FIG. 3 is mounted on a lower arm (100), and a spring having a coil spring structure can be assembled on a lower arm (100).

Referring to the drawing, in the middle of the spring support member (101), an oval-shaped spring hole (109) and a circular first anti-rotation hole (113) are formed from one end of the lower arm (100) to the other end.

And, a sheet projection (201) having a shape corresponding to the spring hole (109) is formed on the bottom surface of the spring sheet (200), and the sheet projection (201) is inserted and assembled into the spring hole (109).

In addition, a rotation prevention projection (203) having a shape corresponding to the first rotation prevention hole (113) is formed on the lower surface of the spring sheet (200), and the rotation prevention projection (203) is inserted and assembled into the first rotation prevention hole (113).

At this time, the lower part of the spring of the coil spring structure is settled and supported on the spring sheet (200).

That is, the seat protrusion (201) and the anti-rotation protrusion (203) formed on the spring seat (200) are assembled into the spring hole (109) and the first anti-rotation hole (113) formed on the lower arm (100), respectively, thereby preventing the spring seat (200) from rotating relative to the lower arm (100).

Accordingly, even if the spring is seated on the spring support member (101), the spring is prevented from being detached from the lower arm (100).

As another example, FIG. 5 is a drawing showing a shape in which an air spring (300) is mounted on a lower arm (100) according to the present invention, and FIG. 6 is a drawing for explaining a structure in which the air spring (300) of FIG. 5 is mounted on a lower arm (100), and a spring having an air spring (300) structure can be assembled on a lower arm (100).

Referring to the drawing, in the middle of the spring support member (101), an oval-shaped spring hole (109) and an oval-shaped second anti-rotation hole (115) are formed from one end to the other end of the lower arm (100).

And, a spring protrusion (301) having a shape corresponding to the spring hole (109) is formed on the bottom surface of the air spring (300), and the spring protrusion (301) is inserted and assembled into the spring hole (109).

In addition, a rotation prevention projection (303) having a shape corresponding to the second rotation prevention hole (115) is formed on the lower surface of the spring sheet (200), and the rotation prevention projection (303) is inserted and assembled into the second rotation prevention hole (115).

That is, the spring protrusion (301) and the anti-rotation protrusion (303) formed on the air spring (300) are assembled into the spring hole (109) and the second anti-rotation hole (115) formed on the lower arm (100), respectively, thereby preventing the air spring (300) from rotating relative to the lower arm (100).

Accordingly, even if the spring is seated on the spring support member (101), the spring is prevented from being detached from the lower arm (100).

Meanwhile, according to the present invention, the lower arm (100) can be manufactured by press forming.

To briefly explain the process of forming a lower arm (100), first, a plate-shaped material is processed and formed into the shape of a lower arm (100).

Then, the material is pressed to form a spring support member (101) protruding in the center of the material, while a flange (105) is formed on the left and right sides of the side wall (103), and one end and the other end of the lower arm (100) are formed to face each other.

Next, the spring support part (101) is pierced to form a spring hole (109) and an anti-rotation hole (113, 115), and the hole bending part (111) is formed through burring of the spring hole (109).

And, an edge bending portion (107) is formed on the edge of the flange (105) through restriking processing using a cam.

Next, a body connection hole (117) where a subframe is assembled is pierced at one end of the lower arm (100), and a wheel connection hole (121) where a knuckle is assembled and a shock absorber connection hole (123) where a shock absorber is assembled are pierced at the other end of the lower arm (100) to complete the processing of the lower arm (100).

In this way, the present invention manufactures the lower arm (100) by forming it into a one-piece shape and then pressing it instead of the conventional lower arm manufacturing method of manufacturing the rear lower arm by welding several parts.

Accordingly, the shape and structure of the lower arm (100) product are simplified to improve aesthetics and make maintenance and management easier.

Furthermore, since the welding process for manufacturing the lower arm (100) is eliminated, the production process is reduced, product production efficiency is improved, and the corrosion performance of the part is improved through the reduction in the amount of welding.

In particular, since the spring is placed on the spring support member (101) protruding upward, the spring support member (101) is formed in a form in which all sides are open.

Accordingly, even if the diameter of the spring is formed longer than the left-right width direction of the spring support member (101), the lower end of the spring does not interfere with the lower arm (100), so that a coil spring of a large size can be applied, and application of springs other than coil springs is also possible, enabling the common use of springs having various structures and shapes.

Furthermore, by forming a bending-shaped reinforcing structure in the edge portion of the lower arm (100) and the spring hole (109) of the spring support portion (101), the rigidity and strength of the lower arm (100) are improved, thereby increasing durability.

Meanwhile, although the present invention has been described in detail only with respect to the above-mentioned specific examples, it is obvious to those skilled in the art that various modifications and variations are possible within the technical scope of the present invention, and it is natural that such modifications and variations fall within the scope of the appended claims.

100 : Lower Arm
101 : Spring support
103 : Side wall
105 : Flange
107: Edge bending section
109 : Spring Hall
111: Hole bending section
113: 1st rotation prevention hole
115: Second rotation prevention hole
117: Body connection hole
119 : Mounting Bush
121: Wheel connection hole
123: Buffer connection hole
200 : Spring seat
201 : Sheet bump
203 : Anti-rotation protrusion
300 : Air spring
301 : Spring protrusion
303 : Anti-rotation protrusion

Claims (7)

A vehicle lower arm characterized in that a spring support portion is formed between one end and the other end of the lower arm, on which a spring is supported, and the spring support portion is formed in a shape that protrudes toward the spring. In claim 1,
The above spring support part is formed in a plate shape;
The side walls on the left and right of the above spring support member are formed in a shape in which they are bent downward;
A vehicle lower arm characterized in that the side wall is formed by connecting one end of the lower arm to the other end. In claim 1,
A flange is formed in a shape that is laterally bent at the bottom of the above side wall;
A vehicle lower arm characterized by having an edge bending portion formed in a shape that is bent perpendicular to the flange at the outer end of the flange. In claim 3,
A vehicle lower arm, characterized in that the edge bending portion is formed in the middle portion of the flange excluding one end and the other end of the lower arm. In claim 1,
A spring hole is formed by penetrating the above spring support member;
A vehicle lower arm characterized by a hole bending portion formed in a shape that is bent perpendicularly to the inner peripheral edge of the spring hole. In claim 5,
A vehicle lower arm characterized in that an anti-rotation hole is formed around the spring hole and a spring seat is mounted on the spring hole and the anti-rotation hole. In claim 1,
A vehicle lower arm, characterized in that the above lower arm is manufactured by press forming.

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