KR101997288B1 - Chassis frame for bus having composite material - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bus body using a composite material, and more particularly, to a bus body using a composite material in which a bus body is divided into an upper body and a lower body using a composite material, The present invention relates to a vehicle body for a bus.
In assembling the bus body, the lower body having the upper body and the floor can be decked (bonded) by using an adhesive without using a mechanical coupling and the part of the filler made of a composite material can be assembled, And to provide a bus body using a composite material capable of shortening the assembly time.

Description

{Chassis frame for bus having composite material}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bus body using a composite material, and more particularly, to a bus body using a composite material in which a bus body is divided into an upper body and a lower body using a composite material, The present invention relates to a vehicle body for a bus.

In the case of an electric vehicle or a hybrid vehicle, it is necessary to reduce the weight of the vehicle in order to improve the fuel efficiency. However, since the metal parts account for about 70% of the total weight, there is a limit in reducing the weight of the vehicle by changing the design. There are many studies to replace metallic materials with composite materials which are lightweight materials.

Generally, the combination of the steel body and the floor uses welding, and the composite body and the floor are joined by mechanical bonding, i.e., bolting, riveting, or adhesive.

In the case of bolting or riveting, which is a mechanical joining method, the joining using only the adhesive is used when the rigidity and the strength can not be maintained sufficiently.

However, when using the bolting or rivet as a mechanical coupling method, disadvantages are that it is manufactured by adding steel for bossing or riveting for manufacturing, so that the work cost and cost are increased, and the pores between the composite skin part and the boss are increased And it may be weak in strength.

 Therefore, it is important to design the composite structure so that sufficient rigidity and strength can be maintained only with the adhesive without using mechanical bonding in bonding the composite.

As described above, there are the following difficulties in manufacturing a small-sized bus body and floor using a composite material.

First, since the composite material is made of resin including plastic and fiber, it has a drawback that welding is impossible.

Second, generally, bolting or rivet, which is a mechanical coupling, is used for joining composite structures. However, in order to use such a mechanical joining method, a separate joining structure such as a boss made of steel is to be inserted and molded, There is a disadvantage in that the strength of the product can not be satisfied because the probability of occurrence of pores increases when inserting a separate member.

Here, the problem of coupling the conventional bus body will be described with reference to the accompanying drawings.

FIG. 1 is a view showing a steel body structure for a bus, in which a steel body upper body of a bus is formed from the front side with a filler 1, a door filler 2, a door filler 3, a window filler 3, And a rear end filler 4 (REAR END PILLAR).

However, as shown in FIG. 1, when the upper vehicle body and the floor are coupled to each other, since different fillers are formed on the upper body for each coupling position, different coupling methods must be applied to the respective coupling positions. Also, since the floor has a multi- There is a disadvantage in that it is difficult to engage with the upper body due to a large tolerance when engaged with the upper body.

In addition, each filler structure of the steel body body has a closed end surface structure through a point of intersection of the outer panel and the inner panel of the thin plate, and the upper body and the lower body can not be connected to each other at the filler portion.

2 shows a conventional deck structure of a composite vehicle body.

The composite body is manufactured using the integral method in the manufacturing method, and is advantageous in terms of production cost and rigidity.

Accordingly, it is advantageous in terms of stiffness strength to fabricate an integrated upper body and an integral lower body having a floor, and then interconnect each other in order to construct the integrated bus body using the composite material.

However, as shown in FIG. 2, since a coupling structure having different structures of bolts, adhesives, or bolts is applied to each position where the upper body and the lower body are coupled, the matching between the upper body and the lower body is too difficult, There is a disadvantage that the coupling structure is difficult to cope with.

Also, as shown in FIG. 2, since the floor has a multi-stage structure, there is a disadvantage that it is difficult to perform a joining operation due to a large tolerance in joining with the upper body.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a composite structure for a vehicle, which can be used for assembling a bus body, in which a lower vehicle body having an upper vehicle body and a floor, The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a bus body using a composite material which is excellent in assembling workability and can be shortened in assembling time.

To achieve the above object, the present invention is characterized in that: the upper body is made of a structure having an upper filler made of a composite material, the lower body integrated with a floor is made into a structure having a lower filler made of a composite material, And a bottom surface of the upper filler and a top surface of the lower filler are bonded to each other using an adhesive to assemble between the lower car bodies.

Preferably, the upper pillars are formed with concave depressions at the lower end surface thereof, and at the same time, engaging grooves are formed in the concave recesses from the inner side to the outer side, and the upper surfaces of the lower pillars are provided with engaging projections .

More preferably, an adhesive is applied and bonded to the mutual contact surfaces between the coupling grooves of the upper pillars and the coupling protrusions of the lower pillars.

The upper pillar according to a preferred embodiment of the present invention comprises: a steel core; A composite material laminated on both sides of the steel core material in the same number and thickness; .

The lower pillar according to a preferred embodiment of the present invention comprises: a PVC foam having a predetermined thickness; An inner composite material laminated on both sides of the steel core in the same number and thickness and laminated on both sides of the PVC foam; An outer composite material laminated on the outer surfaces of the PVC foam and the inner composite material and integrally molded; .

Preferably, the composite material of the upper pillar and the inner and outer composite materials of the lower pillar are made of CFRP (Carbon Fiber Reinforced Plastic) or GFRP (Glass Fiber Reinforced Plastic).

Through the above-mentioned means for solving the problems, the present invention provides the following effects.

First, the upper body and the lower body are made of a structure having an upper filler and a lower filler, each of which is divided into a half by a filler (a filler, a door filler, a window filler, and a rear end filler) The assembling workability of the bus body can be improved, the assembling work time can be greatly shortened, and the cost can be reduced accordingly.

Second, the rigidity of the joint between the upper and lower pillars can be maintained by using the composite material including the composite material of steel and CFRP or GFRP as the upper filler of the upper body and the lower filler of the lower body.

Third, the rigidity can be improved by making the upper body and the lower body (including the floor) integrally structured to improve the rigidity. In addition to the adhesive strength of the upper filler of the upper body and the lower filler of the lower body, It is possible to improve the rigidity of the connection portion between the upper filler and the lower filler and the durability to the entire bus body.

1 is a perspective view showing a bus body according to a conventional example,
2 is a perspective view showing a bus body according to another example of the related art,
3 is a perspective view showing a bus body according to the present invention,
4 and 5 are a perspective view and a cross-sectional view illustrating a structure in which an upper filler and a lower filler of a bus body according to the present invention are coupled to each other,
FIG. 6 and FIG. 7 are cross-sectional views showing that the upper and lower pillars of the bus body according to the present invention are composed of a composite material.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a view showing a bus body according to the present invention, in which reference numeral 10 denotes an upper body and reference numeral 20 denotes a lower body.

The upper vehicle body 10 includes a roof panel of a bus, a pillar 1, a door pillar 2, a window pillar 3, a window pillar 3, a rear end pillar 4, The upper pillars 12 including the upper and lower pillars PILLAR and the like are integrally manufactured.

The lower vehicle body 20 includes a floor of a bus and a lower filler 22 including a filler 1, a door filler 2, a window filler 3, and a rear end filler 4, It was made.

At this time, the upper filler 12 of the upper body 10 and the lower filler 22 of the lower body 20 are connected to the filler 1, the door filler 2, the window filler 3, End filler 4) is divided into upper and lower halves.

4, the upper pillars 12 are formed with concave depressions on the lower end surface thereof, and concave recesses (not shown) are formed on the lower ends of the upper pillars 12 and the lower pillars 22, And an engaging projection 24 is formed integrally with the upper surface of the lower pillar 22 so as to be inserted into the engaging groove 14.

5, an adhesive 30 is applied to the lower end surface of the upper filler 12 and the upper end surface of the lower filler 22, and the adhesive 30 is applied to the upper surface of the lower filler 22, The upper filler 12 and the lower filler 22 are bonded to each other.

More specifically, after the adhesive 30 is applied to the mutual contact surfaces between the coupling grooves 14 of the upper pillars 12 and the coupling projections 24 of the lower pillars 22, The upper filler 12 and the lower filler 22 are bonded to each other by the bonding strength of the adhesive and the upper filler 12 and the lower filler 22 are bonded to each other, The upper body 10 and the lower body 20 are assembled together.

The upper body 10 and the lower body 20 are connected to the upper filler 12 and the lower filler 12 which are divided in half by a filler (a filler, a door filler, a window filler, a rear end filler, 22, the upper pillars 12 and the lower pillars 22 are concavely and convexly joined together and bonded together using an adhesive, so that assembling work for the bus body can be carried out easily and assemblability can be improved, The assembling operation time can be greatly shortened.

Since the portion where the upper body 10 and the lower body 20 are joined to each other is a boundary portion between the upper filler 12 and the lower filler 22, the upper filler 12 and the lower filler 22 ) Is made of composite material.

6, the upper pillar 12 includes a steel core 16 disposed inside thereof, and composite members 18 are stacked on both sides of the steel core 16 in the same number and thickness .

More specifically, the composite material 18 is laminated on both sides of the steel core material 16 and then primary-molded in a mold to form an upper filler (a composite material) 18 on both sides of the steel core material 16 12 are fabricated.

At this time, when the composite materials 18 are laminated on both sides of the steel core material 16, it is important to laminate them in the same number and thickness, because when the same number and thickness are not stacked, It is because.

7, the inner pillars 26 are laminated on both sides of the PVC foam 25 having a predetermined thickness and are firstly molded. Then, the PVC foam 25 and the inner composite 26 And the outer composite material 28 is laminated on the outer surfaces of the four sides of the outer composite material 28 and then secondary molded in the mold.

Molding the inner composite material 26 of the same number and thickness on both sides of the steel core material 16 and forming the PVC foam 25 And an outer composite material 28 on the entire peripheral surface of the inner composite material 26 and the like.

The composite material 18 of the upper filler 12 and the inner and outer composite materials 26 and 28 of the lower filler 22 may be formed of carbon fiber reinforced plastic (CFRP) or glass fiber reinforced plastic (GFRP) .

The composite material 18 of the upper filler 12 and the inner and outer composite materials 26 and 28 of the lower filler 22 may be laminated using a PRE-PREG method, Each composite material exists as a PLY in which fibers are already carburized in the resin, and a plurality of PLYs are stacked to form a resin which is carburized when molded at a high temperature (for example, 100 to 150 DEG C) And at the same time, the fibers are hardened to have a high strength.

The upper filler 12 of the upper vehicle body 10 and the lower filler 22 of the lower vehicle body 20 are made of a composite material including steel and a composite material of CFRP or GFRP, And the lower pillar 22 can be maintained in a rigid state.

10: upper body
12: upper filler
14: Coupling groove
16: steel core material
18: Composite
20: Lower body
22: Lower pillar
24:
25: PVC foam
26: Internal composite material
28: Outside composite material
30: Adhesive

Claims (6)

The upper vehicle body 10 is made of a structure having an upper filler 12 made of a composite material and the lower vehicle body 20 integrated with a floor is made of a structure having a lower filler 22 made of a composite material,
The bottom surface of the upper filler 12 and the upper surface of the lower filler 22 are bonded to each other using an adhesive 30 for assembly between the upper body 10 and the lower body 20,
The lower pillar (22) comprises:
A PVC foam 25 having a predetermined thickness;
An inner composite material 26 laminated on both sides of the steel core material 16 in the same number and thickness and stacked on both sides of the PVC foam 25;
An outer composite material 28 laminated on four outer surfaces of the PVC foam 25 and the inner composite material 26 and integrally molded;
Wherein the composite body is made of a synthetic resin.
The method according to claim 1,
An engaging groove 14 is formed in the lower end surface of the upper filler 12 to form a concave recess and a recessed concave portion from the inner side to the outer side. A coupling groove 14 is formed in the upper surface of the lower filler 22, And a coupling protrusion (24) inserted and fastened in the coupling member (24) is protruded and formed.
The method of claim 2,
Wherein an adhesive agent (30) is applied and adhered to the mutual contact surfaces between the coupling grooves (14) of the upper pillars (12) and the coupling projections (24) of the lower pillars (22).
The method according to claim 1,
The upper pillars (12) comprise:
A steel core material (16);
A composite material 18 laminated and formed on both sides of the steel core material 16 in the same number and thickness;
Wherein the composite body is made of a synthetic resin.
delete The method according to claim 1,
The composite material 18 of the upper filler 12 and the inner and outer composite materials 26 and 28 of the lower filler 22 are formed of carbon fiber reinforced plastic (CFRP) or glass fiber reinforced plastic (GFRP) A bus body using a composite material.

Images