KR20030045320A - Upside reinforcement structure of Bus center frame - Google Patents

Abstract

PURPOSE: An upper reinforcing structure of a center frame of a bus is provided to increase torsional rigidity and flexural rigidity of the vehicle and improve durability of the vehicle. CONSTITUTION: A center frame(10) of a bus supports the middle part of a bus and connects a front and frame and a rear frame. The center frame has a box-shape space by using auxiliary supports(20), outriggers(50), and upper supports(40). Upper reinforcing structures(30) of the center frame form joining parts at both ends and in the middle part. Upper reinforcing structures as truss structure are mounted between the outrigger and the upper support symmetrically around the central axis of the longitudinal direction of a vehicle. Thus, torsional rigidity and flexural rigidity of the vehicle are increased.

Description

Upper reinforcement structure of Bus center frame}

The present invention relates to a center frame reinforcement structure for a bus, and more particularly, to a center frame connecting a front frame and a rear frame while supporting an intermediate portion of a bus, the upper reinforcement structure being bilaterally symmetric with respect to the central axis in the longitudinal direction of the vehicle body. It is related to the upper reinforcement structure of the bus center frame to increase the durability of the vehicle by increasing the torsional rigidity and bending rigidity of the entire vehicle by connecting the upper support and the welding by using.

In general, a bus frame structure is divided into three parts, a front subframe, a center frame, and a rear subframe, and each part of the frame includes a left and right side frame having a predetermined length in a vehicle body length direction. A frame having a length equal to the length is manufactured, and the side frame is connected by a plurality of outriggers or cross members in the vehicle width direction, and is configured to mount suspension devices before and after the frame, respectively.

In addition, the center frame of the bus is formed in a truss structure using a square steel pipe to connect the front frame and the rear frame, and at the same time is formed in a box shape to have a space such as a cargo compartment.

In addition, the floor panel is fused and fixed on the upper side of the frame or fixed using a bolt, thereby simultaneously receiving a load applied to the upper portion of the floor panel.

As such, when the existing bus frame receives an impact from the outside, the existing bus frame absorbs the impact force through each connection part.

1 is a perspective view illustrating a conventional bus center frame, FIG. 2 is a side view illustrating the side of FIG. 1, and FIG. 3 is a cross-sectional view illustrating an A-A portion of FIG. 1.

As shown in the figure, the center frame 1 supporting the middle portion of the bus uses a secondary support 2, an outrigger 3, and an upper support 4 between the front frame and the rear frame to form a box-shaped space. It is formed to have.

The upper support (4) is formed in the upper portion of the center frame (1) mounted in the longitudinal direction of the vehicle by using a rectangular steel pipe, the lower support auxiliary (2) mounted by connecting the square steel pipe in a truss structure The outrigger 3 formed in a plate shape is mounted in the vertical direction in the spaced space between the upper support 4 and the auxiliary support 2.

On the upper side of the upper support 4, a floor panel for supporting the bottom in the vehicle body is fixed using bolts.

The auxiliary support 2 is formed of a truss structure using a square steel pipe for supporting the bottom of the cargo compartment formed in the middle of the vehicle body, the outrigger 3 having a plate shape is attached to the top side, the bottom side and the middle side.

On the upper side of the outrigger 3, a gusset 5 having a rectangular cross-sectional shape for connecting to the upper support 4 by welding is attached to the left and right symmetrically, and both sides have a deck gusset 6 Attached.

The conventional center frame structure having the above-described configuration has no member for withstanding the load and torsion transmitted from the floor panel on the upper side, so the torsional rigidity is very insufficient and the amount of deflection is very large, which is the main cause of vehicle fatigue destruction.

In addition, when connecting the upper support and the auxiliary support by welding using a gusset, there is a problem that the weld strength is not sufficient because the length of the gusset is short.

An object of the present invention devised to solve the problems as described above is to increase the torsional rigidity and bending rigidity of the entire vehicle by mounting the structure in the center frame to increase the durability of the vehicle.

In order to achieve the object of the present invention as described above, after mounting the reinforcing structure formed in the truss structure using a square steel pipe symmetrically to the auxiliary support mounted on the center frame for supporting the middle of the bus and connected to the upper support Provide the upper reinforcement structure of the bus center frame.

1 is a perspective view showing a conventional bus center frame.

FIG. 2 is a side view showing the side of FIG. 1. FIG.

3 is a cross-sectional view illustrating a portion A-A of FIG. 1.

4 is a perspective view showing a center frame of a bus equipped with an upper reinforcement structure according to an embodiment of the present invention.

FIG. 5 is a side view illustrating the side of FIG. 4. FIG.

FIG. 6 is a cross-sectional view showing a section of the B-B portion of FIG. 4. FIG.

7 is a perspective view showing an upper reinforcing structure according to an embodiment of the present invention.

<Brief description of symbols for the main parts of the drawings>

10: center frame 20: auxiliary support

30: upper reinforcing structure 32: coupling portion

40: upper support 50: outrigger

60: decking gusset

Hereinafter, an upper reinforcement structure of a bus center frame according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

4 is a perspective view illustrating a center frame of a bus on which an upper reinforcement structure is mounted according to an embodiment of the present invention, FIG. 5 is a side view illustrating the side of FIG. 4, and FIG. 6 is a cross-sectional view of the BB portion of FIG. 4. It is sectional drawing which shows.

And, Figure 7 is a perspective view showing an upper reinforcing structure according to an embodiment of the present invention.

As shown in the figure, the center frame 10 supporting the middle portion of the bus and connecting the front frame and the rear frame has a box shape using the auxiliary support 20, the upper reinforcing structure 30 and the upper support 40. It is formed to have a space.

On the upper part of the center frame 10, the upper support 40 mounted in the longitudinal direction of the vehicle using a rectangular steel pipe and the upper reinforcing structure 30 formed of a truss structure using a square steel pipe are formed symmetrically on both sides. The lower supporter 20 is formed by connecting a square steel pipe in a truss structure and mounted therein, and an outrigger 50 formed in a plate shape in a space spaced between the upper supporter 40 and the auxiliary supporter 20. ) Is mounted in the vertical direction.

On the upper side of the upper support 40, a floor panel for supporting the bottom in the vehicle body is fixed using a bolt.

The auxiliary support 20 is formed of a truss structure using a square steel pipe for supporting the bottom of the cargo compartment formed in the middle of the vehicle body, the outrigger 50 having a plate shape is attached to the top side, the bottom side and the middle side.

The upper reinforcing structure 30 formed of a truss structure using a square steel pipe has a coupling portion 32 formed at both ends and an intermediate portion thereof to form a central axis in the longitudinal direction of the vehicle body between the outrigger 50 and the upper support 40. It is fixed by welding with bilateral symmetry on the basis.

Both ends of the outrigger 50 is attached to the deck gusset 60 having a cross-sectional shape of the 'b' shape using a bolt.

Since the upper reinforcement structure of the bus center frame according to the embodiment of the present invention having the above configuration is formed using a square steel pipe, a separate mold is not required, thus reducing investment and material costs, and can be easily mounted on a vehicle. Since the coupling part 32 serves as a gusset, the length of the welding part is increased to increase the strength connecting the vehicle body to the chassis frame, thereby increasing the overall rigidity of the entire vehicle.

The present invention having the above configuration forms an upper reinforcing structure by using a square steel pipe, so it is unnecessary to develop a mold for molding the upper reinforcing structure at all times, thus minimizing investment and causing a cost increase, and applying a truss structure. As a result, the torsional rigidity, the bending rigidity, and the amount of deflection are improved, thereby increasing the overall durability of the vehicle.

Claims (1)

A center frame that supports the middle part of the bus, connects the front frame and the rear frame, and has a box-shaped space by using an auxiliary support, an outrigger, and an upper support, and is formed in a truss structure using square steel pipes so that both ends and the middle are formed. Coupling portion 32 is formed in the portion and is characterized by consisting of the upper reinforcement structure 30 is mounted between the outrigger 50 and the upper support 40 in both sides symmetrically based on the central axis of the vehicle body longitudinal direction Upper reinforcement structure of the bus center frame.