KR20140058222A - Front body for electric vehicle - Google Patents

Abstract

A front body for an electric vehicle, according to an embodiment of the present invention is provided with a shock absorber housing and parts and a cross member for surrounding the housing while at least more than two side are jointly connected. The cross member is provided with a closed end structure on at least one cross section, to enhance shockproof performance, and includes: at least one sunk portion to facilitate a spot welding with other parts; an elongation portion for covering the top side of the shock absorber housing; and more than one curved shape or a cut shape provided with an enlarged joint surface with other parts.

Description

BACKGROUND OF THE INVENTION [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an electric vehicle front body, and more particularly, to a crossbody member mounted on a component such as a motor and connected to a shock-absorber housing, thereby improving the durability of the vehicle body.

In recent years, environmentally friendly electric vehicles for the future environment are being developed.

Unlike conventional vehicles such as internal combustion engine vehicles or diesel engine vehicles, electric vehicles are getting popular spotlight as non-polluting automobiles because they do not use petroleum as a raw material and have no exhaust gas and low noise.

Such an electric vehicle can drive the electric motor by driving the electric motor with the electric energy charged in the battery after charging the battery with the electric energy as the energy source and transmitting the driving force generated by the motor to the wheel through the power transmitting device .

Therefore, the electric vehicle essentially requires a configuration of a motor driven by electric energy, and a configuration of a vehicle body on which the motor can be mounted is required.

Accordingly, conventionally, a motor mounting cross member 2 'has been provided to support the motor by means of the motor mounting bracket 4' as shown in Figs. 1a to 1c, and the motor mounting cross member 2 ' And the front side member 5 'composed of the inner 5a' and the outer 5b '.

At this time, the motor mounting cross member 2 'is connected to the shock-mounted shock absorber housing 10' by the motor-mounting cross member 2 'and a shock absorber housing support 3' coupled with the shock absorber housing 10 ' ). ≪ / RTI >

The shock-absorbing shock absorber housing 10 'and the shock absorber shock absorber housing support 3' are connected to a shotgun 1 ', which is provided in the wheel housing to absorb the shock, and assists shock absorption of the vehicle body in front of the electric vehicle.

However, the shock-absorbing shock absorber housing 10 'is subjected to a vertical load by a shock absorber, so that the coupling with the motor-mounting cross member 2' is loosened and disassembled, There was a weakening problem.

That is, the crook member is twisted by the vertical load applied to the shock-proof showbar housing 10 ', and thus the shock-absorbing shock absorber 10' and the motor-mounting cross member 2 ' There is a problem that the coupling of the housing support 3 'is disassembled.

As a result, the durability of the vehicle body in front of the electric vehicle deteriorates, and the adjustment stability and ride comfort can be deteriorated.

In addition, it is difficult to absorb impact energy at the time of a collision with an external facility or another vehicle, which may cause a problem in the stability of the vehicle body in front of the vehicle.

Accordingly, there is a need for a study on an electric vehicle front body capable of enhancing the rigidity of the front body of an electric vehicle and improving its durability, and also mounting components such as a motor, which are essential for an electric vehicle.

An object of the present invention is to provide a front body of an electric vehicle in which a cross member on which components such as a motor can be mounted is modified to improve the durability of the front body of the electric vehicle.

The front vehicle body of the electric vehicle according to an embodiment of the present invention may include a cross member provided with at least two surfaces to be connected and connected while mounting the shockproof showbar housing and the parts of the vehicle.

Further, the cross member of the electric vehicle front body according to the embodiment of the present invention can be provided with at least one end surface in closed structure so that the shock absorbing performance is improved.

Further, the cross member of the electric vehicle front body according to an embodiment of the present invention may include at least one depression for spot welding with peripheral parts.

Further, the cross member of the front body of the electric vehicle according to an embodiment of the present invention may include an extension for curving the upper surface portion of the shock-absorbing shock absorber housing.

In addition, the cross member of the front body of the electric vehicle according to an embodiment of the present invention may include at least one curved shape or a bent shape provided so as to enlarge a joint surface with peripheral parts.

The cross member of the front body of the electric vehicle according to an embodiment of the present invention may include iron (Fe), carbon (C), silicon (Si), manganese (Mn) Sulfur, and other impurities, and the structure includes at least one of ferrite, martensite, and austenite, thereby forming a TWIP steel having a tensile strength of 980 Mpa or more and an elongation of 45 to 65%.

The front body of the electric vehicle of the present invention has an advantage that a cross member on which components such as a motor are mounted can be directly connected to the shock-absorbing housing.

Accordingly, it is unnecessary to provide a separate component for connecting the cross member and the shock absorber housing, and it is possible to prevent the joint from being loosened due to the load acting on the shock absorber & There is an advantage that it can be improved.

In addition, by improving the durability of the cross member and the shock-absorbing shock absorber housing, the adjustment stability and ride comfort can be improved.

On the other hand, since the cross member is joined to two or more surfaces of the shock-absorbing shock absorber housing, there is an advantage that collision performance for absorbing collision energy acting on the front body of the electric vehicle can be improved.

1A to 1C are a perspective view, an exploded perspective view, and a cross-sectional view of a conventional electric vehicle front body.
2A to 2C are a perspective view and a cross-sectional view of a welding portion showing an electric vehicle front body of the present invention.
3 is a cross-sectional view of a part of a front body of an electric vehicle according to the present invention.
4A and 4B are perspective views showing depressions provided in the front body of the electric vehicle of the present invention.
5 is a perspective view showing an extension provided to the front body of the electric vehicle of the present invention.
FIG. 6 is a perspective view and a cross-sectional view of a welding portion showing an electric vehicle front body and a motor mounting bracket of the present invention. FIG.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept. Other embodiments falling within the scope of the inventive concept may readily be suggested, but are also considered to be within the scope of the present invention.

The same reference numerals are used to designate the same components in the same reference numerals in the drawings of the embodiments.

The front body of an electric vehicle of the present invention is provided with a cross member (20) connected to a shock-absorber housing (10) to improve the durability of the body. That is, the cross member 20 on which the components such as the motor are mounted can be directly connected to the shock-absorbing shock absorber housing 10.

Accordingly, a separate component for connecting the cross member 20 to the shock-absorbing housing 10 is unnecessary, and the joint is loosened due to the load acting on the shock-absorbing housing 10 in the vertical direction, It is possible to improve the durability such as the prevention of the occurrence of cracks.

In addition, by improving the durability of the cross member 20 and the shock-absorbing shock absorber housing 10, it is possible to improve the adjustment stability and ride comfort, and the cross member 20 can be mounted on the shock absorber- It is possible to improve the collision performance for absorbing the impact energy acting on the front body of the electric vehicle.

Specifically, Figs. 2A to 2C are a perspective view and a cross-sectional view of a welding portion showing an electric vehicle front body of the present invention. That is, FIG. 2A is a perspective view of an automobile front body of the present invention, and FIG. 2B or FIG. 2C is a sectional view of a portion AA 'of FIG. 2A.

6 is a perspective view and a cross-sectional view of a welding portion showing the electric vehicle front body and the motor mounting bracket 4 of the present invention.

Referring to FIGS. 2A to 2C and 6, a front vehicle body of a vehicle according to an embodiment of the present invention is provided to mount a shock-absorbing shock absorber housing 10 and parts of an automobile. And a cross member 20 which is connected and connected.

Further, the cross member 20 of the front body of the automobile according to the embodiment of the present invention may be provided with at least one end surface in a closed structure so that the shock absorbing performance is improved.

The shock-absorbing shock absorber housing 10 serves as a support member provided on a shock absorber that absorbs shocks in association with the wheels of an electric vehicle. To this end, the shock-absorbing shock absorber housing 10 may be provided on the upper side of the shock absorber.

At this time, when the shock absorber absorbs the up-and-down impact acting on the wheels, the shock absorber-shock absorber housing 10 is also subjected to an up-and-down load by the shock absorber.

The shock absorber housing 10 may be connected to a cross member 20 to be described later to support the cross member 20 together with the front side member 5.

To this end, the shock-absorbing shock absorber housing 10 may be provided with a side end portion 11, a front end portion 12, or a top end portion 13 connected to the cross member 20.

The side end portion 11 is a side portion of the shock-absorbing shock absorber housing 10 and can be connected to a shotgun 1 in an existing electric vehicle. The front end portion 12 is connected to the shock absorber- A front portion of the shock absorber 10 is connected to a shock absorber housing support 3 in an existing electric vehicle and the top portion 13 is a top portion of the shock absorber housing 10 .

The side end portion 11, the front end portion 12 or the top face portion 13 may be formed in a flange shape with one side bent to be connected to the cross member 20 to be described later.

The flange shape may be formed by bending to the outside of the cross member 20 or may be formed by bending inward. When the flange shape is bent outwardly, there is an advantage that the welding means for welding is easy to approach, and when the flanged shape is bent inward, there is an advantage that the influence on the load acting up and down can be reduced.

The upper surface portion 13 may be provided with an extension portion 23 extending from the cross member 20, and a detailed description thereof will be given later with reference to FIG.

The cross member 20 serves to mount components such as a motor. For this purpose, the cross member 20 may be connected to and supported by the shock-absorbing shock absorber housing 10.

That is, in order to support the cross member 20 by the shock-absorbing shock absorber housing 10 in the past, the shock absorber shock absorber 20 is coupled through the shock absorber shock absorber housing support 3, Since the coupling of the cross member 20 coupled by the shock absorber housing support 3 by the vertical load can be loosened and disassembled, the shape of the cross member 20 can be formed in the shock- 10, respectively.

Specifically, the cross member 20 is provided in the width direction (y) of the electric vehicle, and both ends of the cross member 20 can be extended so as to be engaged while covering at least two sides of the shockproof showbar housing 10.

For example, the cross member 20 may be formed so as to be engaged with the front end portion 12 and the side end portion 11 of the shockproof shock absorber housing 10. This is the portion where the shafts and shock absorber housing supports 3 are located. In the present invention, the cross member 20 can be seen as being integrally formed.

Here, the cross member 20 is joined by laser welding at a portion having a closed end surface structure as shown in FIG. 2B in order to be engaged with peripheral parts such as the shock-proof showbar housing 10 or the front side member 5 , A depression 21 to be described later may be formed so that a welding gun can be inserted at the time of spot welding as shown in FIG. 2C.

The cross member 20 is provided with a closed structure (FIG. 6 (b)) having a closed end surface capable of laser welding as shown in FIG. 6 in order to engage with the motor mounting bracket 4 to which the motor is coupled Or a structure in which a depression 21 capable of spot welding is formed (Fig. 6 (c)).

Here, when the cross member 20 is provided in a closed structure, the impact absorbing performance of the cross member 20 can be improved. That is, when the impact acts on the cross member 20, the shock absorbing performance is improved by the effect of dispersing the impact, or when the impact acts on the side, the cross-sectional shape serves as a column, It can be.

Meanwhile, the cross member 20 may extend to the upper surface portion 13 of the shock-mounted shock absorber housing 10, and a detailed description thereof will be given later with reference to FIG.

In addition, the cross member 20 may be provided with a depression 21, which will be described in detail later with reference to FIGS. 4A and 4B.

The bending portion 22 formed by bending the cross member 20 may be formed with a curved shape 22a or a bent shape that can be coupled to the front side member 5 or the like. Will be described later.

FIG. 3 is a cross-sectional view of an electric vehicle front body according to an embodiment of the present invention. Referring to FIG. 3, the cross member 20 of a vehicle body of a vehicle according to an embodiment of the present invention has a cross- And may include at least one curved shape 22a or bent shape provided.

That is, the cross member 20 may be formed as a bending portion 22 to be molded into a shape to be coupled to two or more sides of the shock-absorbing shock absorber housing 10, and the bending portion 22, May be formed to have a curved shape (22a) or a bent shape so as to enlarge a joint surface with peripheral parts such as the front side member (5) and the like.

The curved shape 22a means a shape molded in a rounded shape, and the bent shape means a shape formed in a stepped shape.

As described above, by extending the joining surface with the peripheral parts, it becomes possible to facilitate welding at the time of welding by laser welding or spot welding.

In addition, it is preferable to form the banding radius R at least 1.5 times larger than the diameter of the tube at the time of bending because the thickness reduction during bending can be minimized.

On the other hand, if the radius of curvature R is too large, the joint surface at the time of welding may be insufficient. In order to solve this problem, the curved shape 22a or the bent shape is formed to widen the joint surface.

Since a lot of stretching is performed for a part of the cross member 20 as described above, the elongation rate of the material may be insufficient. In the present invention, it is possible to form a desired shape using a TWIP steel have.

That is, the cross member 20 of the front body of the automobile according to the embodiment of the present invention includes iron (Fe), carbon (C), silicon (Si), manganese (Mn) (P) sulfur (S) and other impurities, and the structure comprises at least one of ferrite, martensite and austenite, thereby forming a TWIP steel having a tensile strength of 980 MPa or more and an elongation of 45 to 65% .

For example, the TWIP steel may comprise 0.3 to 0.9 wt% of carbon (C), 1.0 wt% or less of silicon (Si), 15-30 wt% of manganese (Mn), 0.01 to 4.0 wt% of aluminum (Al) ) 0.05 wt% or less, sulfur (S) 0.01 wt% or less, the balance iron (Fe) and other unavoidable impurities.

Accordingly, the present invention can have meaning as an application example that widens the application range of the TWIP steel in the high strength steel.

That is, the cross member 20 of the front body of the electric vehicle according to the embodiment of the present invention is formed so as to form a curved shape 22a or a bent shape in the bending portion 22, It can be molded as a material.

However, even when another material satisfying the elongation or tensile strength necessary for forming the cross member 20 is used, the electric vehicle may be the front body of the electric vehicle of the present invention.

4A and 4B are perspective views showing a depression 21 provided in an electric vehicle front body of the present invention. Referring to FIG. 4A and FIG. 4B, the cross member 20 of an electric vehicle front body according to an embodiment of the present invention, May include at least one depression 21 so that spot welding with surrounding components is sufficient.

That is, when the cross member 20 is joined to peripheral parts by spot welding, the depressed portion 21 into which the welding gun directly enters can be formed.

At this time, it is preferable that the diameter of the depression 21 is 35 mm or more in order to enter a general welding gun. The shape of the depressed portion 21 can be formed into a shape such as a circle, an ellipse, or a square.

In particular, it is preferable that the depression 21 is formed in a bending portion 22 coupled with the front side member 5 and is provided so as to be capable of spot welding with the front side member.

Concretely, the depressed portion 21 is provided in such a manner that the welding means can come into close contact with the contact surface during spot welding, and may have a groove shape or a hole formed at one side thereof.

The shape shown in Figs. 2C, 3 and 6C is an example of a shape in which a hole is formed on one side, and the shape shown in Figs. 4A and 4B is a shape in which one side of the closed curved surface has a groove shape, This is an example of a contact shape.

FIG. 5 is a perspective view showing an extended portion 23 provided in the front body of an electric vehicle according to the present invention. Referring to FIG. 5, the cross member 20 of the front body of an electric vehicle according to an embodiment of the present invention, And an extension portion 23 for curving the upper surface portion 13 of the shaver housing 10.

That is, the shock-absorbing shock absorber housing 10 is subjected to a vertical load by a shock absorber. In this case, when the shock absorber shock absorber 10 is pre-joined to the shock absorber shock absorber housing 10, The upper surface portion 13 of the shock-absorbing shock absorber housing 10 is provided in a face-to-face manner to improve the durability against the load acting up and down.

The extended portion 23 may be engaged with the entire upper surface of the shock-absorbing shock absorber housing 10, but it may be coupled with only a part of the upper surface of the shock absorber shock absorber housing 10. This can be set according to the required durability and material limitations.

10: shock-absorber housing 11: side end
12: front end portion 13: upper surface portion
20: cross member 21: depression
22: Bending portion 23: Extension portion

Claims (6)

Shock absorber housing of automobile; And
A cross member which is provided to mount the components, and at least two sides of the cross member are joined and connected while enclosing the housing;
And an electric motor. The method according to claim 1,
Wherein the cross member is provided with at least one end surface in a closed structure so as to improve shock absorption performance. 3. The method of claim 2,
Wherein the cross member is at least one depression for use in spot welding with peripheral components;
And an electric motor. The method according to claim 1,
The cross member includes an extension portion for curving an upper surface portion of the shock-absorbing shock absorber housing;
And an electric motor. The method according to claim 1,
The cross member may include at least one curved or bent shape provided to enlarge a joint surface with peripheral parts;
And an electric motor. 6. The method according to any one of claims 1 to 5,
The cross member includes iron (Fe), carbon (C), silicon (Si), manganese (Mn), aluminum (Al), sulfur (S), and other impurities, Martensite, and austenite to have a tensile strength of 980 Mpa or more and an elongation of 45 to 65%.

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