JPH1086842A - Space frame structure of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate welding and joining of a longitudinal directional frame member by integrally constituting a main floor part and an extending part extending in either one direction of forward or backward direction or both directions from the main floor part by a single extruded material in a frame member. SOLUTION: When a space frame is manufactured, a hollow extruded material such as an aluminium material is bent so that a main floor part 21 becomes a straight shape and a front part 22 and a rear part 23 can avoid interference between front wheels 106 and rear wheels 107, and a side frame 2 is molded. A chassis member 1 is molded so that the hollow extruded material such as an aluminium member becomes a straight shape over a front part 12 and a rear part 13 from a main floor 111. A front cross and a rear cross 6 are installed in the car width direction, and a crossing part of the chassis member 1 and the side frame 2 is welded and fixed. Therefore, the member number and welding manhours are sharply reduced, and since a welding part does not exist in a longitudinal directional frame, welding strain and reduction in strength are not caused.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a space frame structure mainly using an extruded aluminum material in a vehicle such as an electric vehicle.

[0002]

2. Description of the Related Art In a small and lightweight automobile, a space frame of a vehicle body using a hollow aluminum extruded material has been used.

FIG. 2 shows a schematic configuration of such an electric vehicle (hereinafter abbreviated as an EV vehicle). In FIG. 2, 100 is a vehicle body, 101 is a cabin, 103 is a battery, 104 is a battery room in which the battery is stored, 105 is a power plant that is a driving source for driving, 109
Is an electric device, 106 is a front wheel, 107 is a rear wheel, 108 is a side member serving as a base of a space frame structure, 11
0 is an occupant.

FIGS. 5 and 6 show a conventional example of a space frame structure in the electric vehicle. 5 and 6, reference numeral 51 denotes a side sill extending forward and backward on the side of the main floor 11 of the vehicle body, 52 denotes a front side member connected to the front of the side sill, and 53 denotes a rear side member connected to the rear. It is. Reference numeral 54 denotes a floor side member extending in the front-rear direction below the main floor 11, and reference numeral 55 denotes a sub-frame disposed at the front center.

The side sill 51, the front side member 52, the rear side member 53, and the floor side member 5
4. The sub-frame 55 is provided symmetrically with respect to the center 60 of the vehicle body. 57 is a front cross connecting the left and right front side members 54, and 56 is a rear cross connecting the left and right side sills 51. Also,
Japanese Patent Application Laid-Open No. 4-81372 discloses a space frame structure using a hollow aluminum extruded material. This is because the front ends of the two side frames in the front-rear direction are joined by a front cross member, and bifurcated in the middle of the side frames to form four front-rear frames. The rear end is connected by a cross member, and two side frames (rear) are further provided behind the rear cross member, and the rear end is connected by the rear cross member.

[0006]

In the conventional space frame structure shown in FIGS. 5 and 6, the lower frame to which the weight of the vehicle is loaded has two side sills outside the lower portion of the main floor 11. 51, two floor side members 54 extend in the front-rear direction of the vehicle, respectively, and a front side member 52 and a rear side member 53 are welded to the front and rear of the side sill 51. Front cross 57 and rear cross 56
, The floor side member 54 is welded and joined, so that the number of members constituting the frame is large, and therefore the number of joints by welding is inevitably increased. Also, in the above-mentioned Japanese Patent Application Laid-Open No. 4-81372, the side frame is divided into two at the front, four at the center, and two at the rear, and each divided end is joined by three cross members. Therefore, also in this case, similarly to the above, the number of members constituting the frame is large, and the number of welding locations is also large.

For this reason, in the conventional space frame structure, the number of members is increased and the number of welding steps is increased, so that the manufacturing cost is increased. Further, a decrease in strength at the welded joint is inevitable. There is a problem that durability against an impact load due to vertical vibration or the like is significantly reduced.

In view of the above-mentioned problems, the present invention eliminates the need for welding and joining the members in the front-rear direction frame, thereby reducing the number of members, reducing the number of manufacturing steps, and further accompanying the welding. It is an object of the present invention to provide a high-quality, highly durable space frame structure without deformation or reduction in strength.

[Means for Solving the Problems]

The present invention has been made to solve the above-mentioned problems, and a feature thereof is that in a space frame structure of a vehicle provided with a frame member made of an extruded member extending in the front-rear direction of the vehicle, The member is formed by integrally forming a main floor portion and an extension portion extending from the main floor portion in one direction or both directions in the front and rear directions with a single extruded material. A frame member extending in the front-rear direction and made of a hollow extruded material, the frame member extending forward and backward from a main floor portion of the vehicle, and having a front portion and a rear portion, and That is, the members are arranged symmetrically.

According to the above means, the frame member is formed by extending a single extruded material in the front-rear direction and bending required portions. Therefore, the need for a welded joint as in the conventional case is eliminated, the number of members is significantly reduced, and since the welding operation is not required, the number of manufacturing steps is greatly reduced, and the frame members are arranged in front and rear. The front end member and the rear end member can be shared, reducing the number of parts and improving the vehicle body weight balance.

Further, since there is no welded portion in the longitudinal frame material, there is no deformation due to welding distortion, the accuracy and quality of the product are high, and there is no strength reduction in the welded portion. It can be maintained, and particularly because it is a frame member that is integrated in the front and rear direction extending in the front and rear direction of the vehicle, the impact load is also improved, and the safety is improved.

Preferably, the frame member is disposed on both sides of the vehicle, and is used for a side frame extending in a front-rear direction and a chassis member extending in a longitudinal direction of the vehicle from a main floor portion of the vehicle.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. It's just

FIG. 1 is a perspective view of a main part of a space frame structure of an electric vehicle (hereinafter abbreviated as an EV vehicle) according to an embodiment of the present invention. The space frame of such an EV car is
All consist of extruded aluminum.

In FIG. 1, reference numeral 1 denotes a chassis member extending forward and rearward at a center lower portion of a vehicle body 100; 2 denotes two side frames extending forward and backward at a lower portion on both sides of the vehicle body; 2 is a front end member provided at a front part of the vehicle body, 5 is a rear end member provided at a rear part of the vehicle body, and both are chassis members 1, 1 and side members. Frame 2,
The two members are shared by the same member because they extend symmetrically around two. Reference numeral 6 denotes a rear cross provided between the side frames 2, reference numeral 71 denotes a rear floor, reference numeral 11 denotes a main floor, reference numeral 8 denotes a battery tray of a battery built-in floor (abbreviated as BBF) which is provided integrally with the vehicle body frame below the vehicle body 100, 9a, 9b, 9c and 9d are mounting members, 10a, 10b, 10c and 10d are mounting members.

FIGS. 3 and 4 are structural views of the frame member at the lower part of the vehicle according to the present invention shown in FIG. 3 and 4, the side frame 2 is formed by a single extruded material from a main floor portion 21 located on both sides of the main floor 11 to a front portion 22 extending forward of the vehicle and a rear portion 23 extending rearward. Thus, the three portions are formed to be straight in a planar shape.

The side frame 2 is provided with a front wheel 10.
6 to avoid interference with the rear wheel 107.
The rear portion 23 has a so-called kick-up shape formed so as to extend forward or rearward after being bent upward from the main floor portion 21.

The chassis member 1 includes a main floor 11
And a front portion 12 and a rear portion 13 extending forward and rearward from the main floor portion 111, respectively, so that the three portions become straight with a single extruded material. Is molded. The front portion 12 and the rear portion 13 also serve as subframes of the conventional one shown in FIG.

The left and right side frames 2, 2
Between them, a front cross 7 on the front side and a rear cross 6 on the rear side are erected through the chassis member 1, respectively, and the space frame is firmly connected in the width direction of the vehicle by the front cross 7 and the rear cross 6. .

The side frame 2 and the chassis member 1
Among them, at least the side frame 2 is formed symmetrically with respect to the center of the main floor portion 21. As a result, these space frame components can be shared on the left and right.

At the time of manufacturing the space frame configured as described above, the side frame 2 is made of a hollow extruded material such as an aluminum material, as shown in FIG. And the rear part 23
However, it is formed by performing a bending process so as to avoid interference with the front wheel 106 and the rear wheel 107. The chassis member 1 is formed by extruding a hollow extruded material such as an aluminum material into a straight shape from the main floor 111 to the front portion 12 and the rear portion 13.

Then, the front cross 7 and the rear cross 6 are erected in the vehicle width direction, and the intersection between the chassis member 1 and the side frame 2 is fixed by welding.

As described above, the space frame according to the embodiment of the present invention can be manufactured by extending a single extruded material in the front-rear direction and bending only a required portion. The welding work only needs to be performed on the front cross and rear cross fixing parts, and the number of welding steps is greatly reduced.

Further, since there is no welded portion in the front-back direction frame member, there is no occurrence of deformation due to welding distortion and a decrease in strength at the welded portion.

【The invention's effect】

According to the present invention, a frame member extending in the front-rear direction of a vehicle can be manufactured only by molding a single extruded material into a required shape. In addition to the reduction, the number of manufacturing steps is greatly reduced due to the reduction in the number of welding steps, and a low-cost space frame can be obtained.

Further, since there is no welded portion in the front-back direction frame member, there is no deformation due to welding distortion, a high-precision and high-quality product is obtained, and there is no decrease in strength at the welded portion unlike the conventional one. Thus, a durable and improved space frame is obtained.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a space frame structure for an electric vehicle according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of the electric vehicle.

FIG. 3 is a plan view of a space frame structure under a vehicle according to the embodiment of the present invention.

FIG. 4 is a side view corresponding to FIG. 3;

FIG. 5 is a diagram corresponding to FIG. 3 showing a conventional space frame structure.

FIG. 6 is a side view corresponding to FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chassis member 2 Side frame 6 Rear cross 7 Front cross 12 Front part 13 Rear part 21 Main floor part 22 Front part 23 Rear part 71 Rear floor 111 Main floor part

Claims (4)

[Claims] 1. A space frame structure for a vehicle including a frame member made of an extruded member extending in a front-rear direction of the vehicle, wherein the frame member includes a main floor portion and any one of front and rear sides from the main floor portion. A space frame structure for a vehicle, wherein an extended portion extending in one direction or both directions is integrally formed by a single extruded material. 2. A front-rear integrated frame member extending in the front-rear direction of the vehicle and formed of a hollow extruded material, wherein the frame member extends front-rear from a main floor portion of the vehicle and has a front portion and a rear portion. A space frame structure for a vehicle, comprising: a frame member disposed in front and rear of the vehicle. 3. The side frame according to claim 1, wherein the frame members are arranged on both sides of the vehicle and extend in the front-rear direction.
Or the space frame structure of the vehicle according to 2. 4. The space frame structure for a vehicle according to claim 1, wherein the frame member is a chassis member extending in a longitudinal direction of the vehicle from a main floor portion of the vehicle.