KR20220120119A - chassis frame for electric cars - Google Patents

Abstract

The present invention provides a chassis frame for a low-speed electric car which can protect a battery mounting portion of an electric car from a laterally applied impact. According to the present invention, the chassis frame for a low-speed electric car comprises: a base frame unit including center members arranged in a longitudinal direction and cross members connecting the center members to each other; a side frame unit supported by the cross members of the base frame unit; a plurality of pillar members of which the base portions thereof are fixed on the side frame unit to be vertically installed; a roof frame unit supported by the pillar members; a wheel cover frame unit installed on the pillar members and the side frame member to protect the wheel cover unit and sides; a battery frame unit installed in the middle of the lower surface of the base frame unit to support a battery; and a protective frame unit installed on the front side of the battery support frame unit and the base frame unit to protect the battery support frame unit.

Description

Chassis frame for electric cars

The present invention relates to a chassis frame for a low-speed electric vehicle, and more particularly, to a frame for a low-speed train with an improved battery support frame installed in a base frame.

In general, the chassis frame constituting the lower frame of a vehicle has a function of protecting the occupants and a solid platform that can support the engine, power transmission system, steering system, suspension, brake system, fuel system, etc. It serves to enhance the bending and torsional rigidity of the car body and reduce vibration and noise transmitted through the engine and suspension.

Such a chassis frame is usually composed of a side member installed in the longitudinal direction of the vehicle and a cross member connecting the side members. The energy absorption is high in the frame, and it is greatly affected by the bending angle of the chassis frame, the cross-sectional shape, and the bonding structure between the front side member and the center side member.

On the other hand, electric vehicles that use electricity harmless to the environment instead of conventional fossil fuels are being actively developed not only in terms of battery technology but also in terms of weight reduction. It is no exaggeration to say that the most important key to the weight reduction of electric vehicles lies in the material constituting the frame. Conventional electric vehicle frames are generally manufactured by processing aluminum alloy materials.

However, the aluminum alloy material has a limit in providing high rigidity even though the weight is lighter than that of the steel material. Accordingly, the development of materials and processing technologies capable of simultaneously satisfying high rigidity and weight reduction of the vehicle body is continuously being made.

High-tensile steel is a representative material for making frames for electric vehicles as well as general automobiles, and it is the main material constituting the frame of automobiles along with aluminum alloy. Such high tensile steel is superior to other materials in terms of material properties and cost, so it is still recognized as a representative material for automobile parts.

However, it is possible to secure rigidity for maintaining safety while reducing the weight of the vehicle body according to not only the use of materials such as high-tensile steel or aluminum alloy, but also the structure of combining these materials. That is, in order to manufacture the car body of an electric vehicle in consideration of collision safety, it is essential to develop a frame manufacturing technology using a high-tensile steel material, a technology that can reduce welding deformation, and a bonding technology between component parts.

With many advances in automobile industry technology, a monocoque type automobile body to which a steel stamping technology is applied has enabled mass production and weight reduction. Further, in response to environmental problems and fuel cost reduction, the development of a vehicle body using an aluminum alloy and a space frame have been made, and the development of a multi-material vehicle body has recently been studied.

Korean Patent Registration No. 10-1145241 discloses a method of coupling a body frame for a small electric vehicle, and Korean Patent Publication No. 2012-0089315 discloses an engine frame for an electric engine of a vehicle.

In addition, Korean Patent Publication No. 2020-0080706 discloses a frame for an electric vehicle, and Korean Patent Publication No. 2016-0128818 discloses a frame for a vehicle.

The published frame for a vehicle includes a frame including a side member formed in the longitudinal direction of the vehicle, and a case slidable along the side member, and has a structure in which the center of gravity of the vehicle is changed according to the movement of the case.

However, the conventional chassis frame as described above does not have a separate structure for protecting the wheel cover, and it is difficult to absorb the impact force from the side shaft.

In particular, since the battery mounting portion of the chassis frame of the electric vehicle is located on the side adjacent to the wheel cover of the rear wheel, when an impact is applied from the wheel side, the impact is applied to the battery, so there is a risk of fire or explosion.

Korean Patent Registration No. 10-1145241 Korean Patent Publication No. 2012-0089315 Republic of Korea Patent Publication No. 2020-0080706 Korean Mingeuk Patent Publication No. 2016-0128818

The present invention provides a chassis frame for a low-speed electric vehicle capable of protecting the battery mounting portion of an electric vehicle from impacts applied to the side and increasing the absorption of side impacts to solve the problems as described above. have.

Another object of the present invention is to provide a chassis frame for a low-speed electric vehicle capable of preventing damage to a wheel, a wheel cover, a driving part and a base frame part by increasing the absorption power of the lateral shaft diameter.

A chassis frame for a low-speed electric vehicle of the present invention for achieving the above object includes a base frame portion including center members arranged in a longitudinal direction and cross members interconnecting the cent members;

a side frame part supported by a cross member of the base frame part; a plurality of pillar members having a base fixed to the side frame part and installed vertically; and a roof frame part supported by the pillar members;

a wheel cover frame part installed on the side frame member and the pillar member to protect the wheel cover part and side surfaces;

A battery support frame part installed in the central part of the lower surface of the base frame part to support the battery, and a protection frame part installed in the front side of the battery support frame part and the base frame part to protect the battery support frame part, characterized in that do.

In the present invention, the battery support frame part connects the suspension members installed downward from the base frame part, main support members installed parallel to each other in the front-rear direction on the suspension members, and both ends of the main support members It includes connecting support members that

Each of the side surfaces of the main support members further includes a leveling member.

An elastic support part may be further provided on the main support members.

And the wheel cover frame part includes first and second reinforcing members which are fixed to both side arm members of the wheel cover part and whose ends are fixed to the side frame part, and second reinforcing members interconnecting the first reinforcing members, and the first and second reinforcing members A first connecting reinforcing member connecting the members to each other, and a third reinforcing member fixed to the side frame portion and having both ends connecting the first reinforcing member and the second connecting reinforcing member.

And an extension portion is provided on one side to which the first reinforcing member and the second reinforcing member are connected and the second reinforcing member.

The protective frame portion is capable of absorbing the impact force when the impact of a foreign object, and a plurality of inclined members that connect the main support member and the base frame and are installed to be inclined, and a buffer panel supported by the inclined members. .

The chassis frame for a low-speed electric vehicle according to the present invention can prevent the battery support frame part supporting the battery from being damaged by the impact applied to the vehicle, and can prevent the impact force of foreign substances from being transmitted to the battery side by the protective frame part. can In addition, the pillar member and the side frame part protect the wheel and the wheel cover side, and it is possible to prevent the pillar member from being damaged by buffering the impact force applied from the side.

1 is a perspective view showing a chassis frame for a low-speed electric vehicle according to the present invention;
2 is a side view showing a chassis frame for a low-speed electric vehicle;
3 is an exploded perspective view of a chassis frame for a low-speed electric vehicle shown in FIG. 1;

The present invention relates to a chassis frame for a low-speed electric vehicle, and an embodiment thereof is shown in FIGS. 1 to 3 .

Referring to the drawings, the chassis frame 10 for a low-speed electric vehicle according to the present invention includes center members 21 arranged in the longitudinal direction of the electric vehicle and cross members 22 interconnecting the cent members 21 . It has a base frame portion 20 including. And the side frame part 30 is supported on the cross member 22 of the base frame part 20, and the side frame part 30 is provided with a plurality of pillar members 40, the base being fixed and vertically installed. and a roof frame part 50 is installed on these pillar members 40 .

The base plate 60 is installed on the upper surface and the front side of the central part of the base frame part 20 . And a sub-frame part 70 for installing a driving mechanism or a suspension device or auxiliary equipment is installed on the rear side of the base frame part 20 .

A wheel cover frame portion 80 is installed on the side frame member 30 and the pillar member 40 to protect the wheel cover portion and the side surface, and a lower surface of the central portion of the base frame portion 20 supports a battery. The frame part 100 is installed, and the protective frame part 120 is installed on the front side and the base frame part 20 of the battery support frame part 100 to protect the battery support frame part 100. .

The chassis frame for a low-speed vehicle according to the present invention configured as described above will be described in more detail for each component as follows.

The base frame part 20 comprising the center members 21 of the chassis frame 10 for a low-speed electric vehicle according to the invention and the cross member 22 interconnecting the cent members 21 is provided on the front side and the rear side. Each of the bumper frame parts 25 may be installed.

The wheel cover frame part 80 is to protect the side of the vehicle, the wheeler and the wheel from external impact, and the first reinforcing members 81 are provided on the corresponding surfaces of the both side pawl members 40 of the wheel cover part 200 . is installed, and between the first reinforcing members 81, second reinforcing members 82 are installed at predetermined intervals. Both ends of the second reinforcing member 82 may be fixed to corresponding surfaces of the first reinforcing members 81 , and the second reinforcing member 82 may have a bent structure in a predetermined shape. An end of the first reinforcing member 81 is fixed to the side frame 30 . The first connecting reinforcing members 83 for interconnecting the second reinforcing members 82 are installed between the second reinforcing members 82 , and the third reinforcing member 84 is provided on the side frame part 30 . is installed, and both ends of the ends of the third reinforcing member 84 are connected to the ends of the second connecting reinforcing member 85 supported by the first reinforcing member 81 and the second reinforcing member 83, respectively.

On the other hand, the second reinforcing member 82 and the first and second connecting reinforcing members 83 are formed with extension portions 86 that are elongated by impact force upon impact. The extension portion 86 is a second reinforcing member 82 or a length of the first and second connection reinforcing members 85 and 86 that can be deformed and stretched by an impact force, and is formed of a corrugated bent portion. The corrugated bent portion may be formed in a corrugated shape, but is not limited thereto, and may be formed of an elastic member formed by bending a spring steel plate into a corrugated shape.

The wheel cover frame part 80 can protect the wheel and wheel cover of the electric vehicle when an impact occurs from the shaft of the low-speed electric vehicle, that is, due to a collision accident. In particular, when a relatively large impact is applied from the side of the electric vehicle, the second reinforcing member 82 and the first and second connecting reinforcing members 84 and 85 are deformed to absorb the impact force while absorbing the impact force. , since both ends of the second reinforcing member 82 are supported by the first reinforcing members 81 installed on both sides of the pillar member 40, the supporting force according to the deformation can be improved. In particular, since the first and second reinforcing members 81 and 82 are provided with the extension portion 86, the extension portion 86 is elongated by the impact force, that is, the deformation force, that is, the traction force acting on the peely member 40 is minimized. Therefore, it is possible to prevent deformation of the pillar member 40 .

In addition, one of the second reinforcing members 82 can be installed along the edge of the wheel cover to protect the wheel cover and the wheel of the electric vehicle from impact force, thereby supporting the wheel, and furthermore, a support part for supporting the wheel; It can protect the driving part.

The battery support frame part 100 is installed in the center of the lower surface of the base frame part 20 to support the battery unit (not shown) of the electric vehicle, and is a suspension member ( 101) are installed, and main support members 102 and 103 are installed on the suspension members 101 so as to be parallel to each other in the front and rear directions of the base frame part 20 . In addition, connecting support members 104 and 105 are installed at both ends of the main support members 102 and 103 . A battery support plate (not shown) is installed on the upper surfaces of the main support members 102 and 103 and the heat connection support members 104 and 105 .

And on the outer circumferential surface of the main support members 102 and 103, horizontal maintenance members 110 for maintaining a horizontal state by preventing deformation of the main support members 102 and 103 in the longitudinal direction, respectively, are installed. The horizontal holding member 110 is installed on the outer circumferential surface of each of the main support members 102 and 103, and includes a first holding member 111 fixedly installed on the outer circumferential surface of the main support member, and the first oil collecting member 111. ) and a second holding member 112 for preventing deformation of the first holding member 111 by being installed in a right angle direction, and the first and second holding members 111 and 112 being provided. And a third holding member 113 for preventing deformation for the first and second holding members 111 and 112 to maintain the perpendicular state of the first and second holding members 111 and 112 can be made with The third holding member 113 is installed in the longitudinal direction of the first and second holding members 111 and 112 and may be formed in the shape of a corrugated corrugated gate, respectively.

The suspension member 101 installed on the base frame part 20 may further include an elastic support part (not shown) for absorbing vibration caused by an impact force during driving of the vehicle. The elastic support part may be formed by installing an elastic member such as a rubber material between the fixing part of the suspension member 101 and the base frame part 20 .

Since the battery frame part 20 is fixedly installed on the lower surface of the central part of the base frame part 20 of the vehicle, it is easy to secure a relatively planar wide space, and the main support members 102 and 103 are deformed by the impact force. This can prevent damage to the battery and reduce the risk of fire.

On the other hand, the protection frame portion 130 is installed on the front side of the battery support frame portion 100 and the base frame portion 20 to protect the battery support frame portion 100 is further provided. The protective frame unit 130 is capable of absorbing the impact force upon impact of a foreign object, connects the main support members 102 and 103 and the base frame unit 20, and a plurality of inclined members installed at an angle ( 131) and a buffer panel 135 supported by the inclined member 131. The buffer panels 135 are made of a corrugated plate having relatively small valleys and mountains. The buffer panel 135 may be formed of a pipe bent in a meandering manner.

The protective frame part 130 having such a corrogate-shaped panel is severely damaged by the battery support frame part 100 as the buffer panel 135 is deformed when it collides with an obstacle flowing into the lower surface of the electric vehicle during the driving process of the low-speed electric vehicle. impact can be prevented.

As described above, the chassis frame of the low-speed electric vehicle according to the present invention can protect the battery support frame unit 100 from external impact to prevent damage to the stored battery, and protect the side of the wheel cover, so that the wheel and It can protect the wheel cover, the wheel support part and the driving part.

Although the present invention has been described with reference to the embodiment shown in the drawings, which is only exemplary, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

Claims (4)

A base frame portion including center members arranged in the longitudinal direction and cross members interconnecting the cent members;
a side frame part supported by a cross member of the base frame part; a plurality of pillar members having a base fixed to the side frame part and installed vertically; and a roof frame part supported by the pillar members;
a wheel cover frame part installed on the side frame member and the pillar member to protect the wheel cover part and side surfaces;
A battery support frame part installed in the central part of the lower surface of the base frame part to support the battery, and a protection frame part installed in the front side of the battery support frame part and the base frame part to protect the battery support frame part, characterized in that it is provided. Chassis frame for low-speed electric vehicles. The method of claim 1,
The battery support frame part includes suspension members installed downward from the base frame part, main support members installed parallel to each other in the front and rear directions on the suspension members, and connection support members connecting both ends of the main support members. The chassis frame for a low-speed electric vehicle, characterized in that it further comprises a leveling member on the side of each of the main support members. The method of claim 1,
The wheel cover frame portion includes first reinforcing members fixed to both sides of the wheel cover portion and having ends fixed to the side frame portion, second reinforcing members interconnecting the first reinforcing members, and the first and second reinforcing members a first connecting reinforcing member for interconnecting them, and a third reinforcing member fixed to the side frame portion and having both ends connecting the first reinforcing member and the second connecting reinforcing member,
The chassis frame for a low-speed electric vehicle, characterized in that the first reinforcing member and the second reinforcing member are connected to one side and the second reinforcing member is provided with an extension portion. The method of claim 1,
The protective frame portion is capable of absorbing the impact force upon impact of a foreign object, and a plurality of inclined members that connect the main support member and the base frame and are installed at an angle, and a buffer panel supported by the inclined members. Chassis frame for low-speed electric vehicle, characterized in that. do.

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