KR20020040279A - Roof vibration retrenchment structure of a large size bus - Google Patents

Abstract

PURPOSE: Structure for reducing the vibration of a roof of a bus is provided to increase the frequency of an upward/downward vibration mode and to enhance reinforcing effect by installing a support bar between a stay structure and a cantilever rail. CONSTITUTION: A stay structure(32) is installed under a roof bow(30) of a bus. A cantilever rail(34) is installed on the side of the roof bow. A duct(36) is installed on the side of the stay structure. A window pillar(40) is installed at a lower portion of the cantilever rail. A support bar(38) is installed between the stay structure and the cantilever rail to increase the strength of a roof. A through groove penetrated with the support bar is formed in the duct. The stay structure is made of an aluminum cast-iron product. By connecting the stay structure with the support bar, the bending rigidity of the roof is strengthened and the frequency of an upward/downward vibration mode is increased.

Description

Loop vibration retrenchment structure of a large size bus

The present invention can reduce the indoor noise level generated while driving a large bus, close the loop vibration level, and increase the bending rigidity of the loop by connecting the roof bow and the cant rail with the existing shelf structure and the new support bar. The present invention relates to a loop vibration reduction structure of a large bus which can lower the vertical vibration mode of the loop.

In general, the roof bow of a large bus has a plurality of parts installed at the bottom thereof to form an internal structure of the large bus. The roof bow is positioned with a shelf structure below and a duct is installed between the shelf structure and the cant rail. The window pillar is installed at the lower portion of the cant rail.

The large bus generates large loop vibrations when it passes through a non-slip road at a certain speed.

FIG. 1A is a diagram illustrating a conventional large bus, and FIG. 1B is a diagram illustrating a cross-sectional state of the “AA” portion of FIG. 1A for explaining a vibration state, and FIG. 1C is a diagram for describing a loop structure of a conventional large bus. It is a figure and FIG. 1D is a figure which shows the state which expanded B part of FIG. 1C.

The roof bow 12 of the large bus 10 is provided with a shelf structure 14 at the bottom, a cant rail 16 is installed at the side of the roof bow 12, the shelf structure 14, the side A duct 18 is installed in the duct 18, and a window pillar 20 is installed below the cant rail 16. The large bus 10 is provided with an air condenser & evaporator 22 on top of the roof panel.

As can be seen in Figure 1b, the shape of the vertical vibration mode of the loop (aka pumping mode (10.4 Hz)) forms a loop structure and a side structure, the vertical vibration mode of the loop is the frequency of the road surface excitation force If it occurs constantly at 10.0 ~ 10.5 Hz, it can be seen that the main cause is the resonance between the road excitation force and the vibration mode of the body loop.

As described above, the loop structure of the conventional large bus has a very large loop vibration when passing the non-slip road at a certain speed (60 to 100 km / h), and the shelf structure is loaded on the loop inside the roof bow. In addition, the loop structure of a large bus has a high cost and a reinforcement effect when it is desired to directly reinforce the loop structure in order to increase the frequency of the vertical vibration mode of the loop. As a result, they had a problem of reducing indoor noise on large buses.

The present invention to solve the above problems, the present invention, by installing a support bar between the shelf structure and the cant rail constituting the loop structure of a large bus, it is possible to increase the frequency of the up and down vibration mode, can also enhance the reinforcement effect It is an object of the present invention to provide a loop vibration reduction structure for a large bus.

The present invention, in order to achieve the above object, the present invention, the roof bow of the large bus, the shelf structure is installed on the inner bottom, the shelf structure is installed on the side of the duct, the roof bow cant rail on the side In the loop vibration reduction structure of a large bus having a window pillar installed on the cant rail, the support bar is fixed to the shelf structure and the cant rail in order to increase the bending rigidity of the shelf structure, and the support is provided on one side of the duct. It provides a loop vibration reduction structure of a large bus, characterized in that the through groove is formed so that the bar can be penetrated.

FIG. 1A is a view showing a conventional large bus, FIG. 1B is a view showing the "AA" section cross-sectional state of FIG. 1A for explaining the vibration state, FIG. 1D is an enlarged view of a state B in FIG. 1C.

FIG. 2A is a view for explaining a loop structure of a conventional large bus, and FIG. 2B is an enlarged view of a portion C of FIG. 2A.

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

30: loop bow 32: shelf structure

34: cant rail 36: duct

38: Support Bar 40: Window Filler

42: air condenser & evaporator 44: through groove

50: large bus

FIG. 2A is a diagram for describing a loop structure of a conventional large bus, and FIG. 2B is an enlarged view illustrating a portion C of FIG. 2A.

An air condenser & evaporator 42 is installed on the roof panel of the large bus 50, and a shelf structure 32 is installed on the roof bow 30 of the large bus 50, and the roof bow ( 32, a cant rail 34 constituting the side structure is provided.

The shelf structure 32 is provided with a duct 36 on its side, and the cant rail 34 is provided with a window pillar 40 at the bottom, the shelf structure 32 and the cant rail 34 is In order to increase the loop rigidity, the support bar 38 is provided. The duct 36 is formed with a through groove 44 through which the support bar 38 can pass, and the shelf structure 32 is formed of an aluminum casting.

As can be seen from the above description, by connecting the shelf structure 32 and the support bar 38 to the loop bow 32 of the large bus 30, the bending rigidity of the loop can be increased to increase the frequency of the vertical vibration mode. do.

Effects of the configuration and operation of the present invention described above will be described.

According to the present invention, when the loop structure of the large bus is configured, the loop vibration level is significantly reduced compared to the conventional large bus, and the cost is reduced because the number of parts and processes is reduced compared to the case of directly reinforcing the loop structure. The effect can be obtained.

In addition, the loop structure according to the present invention can increase the bending rigidity of the loop to increase the vertical vibration mode as well as to obtain the effect of reinforcing the loop structure.

Claims (1)

Large buses are provided with a shelf structure on the inner side of the roof bow of the large bus, a duct on the side of the shelf structure, a cant rail on the side of the roof bow, and a window pillar on the cant rail. In the loop vibration reduction structure of the support structure, the support bar 38 is fixed to the shelf structure 32 and the cant rail 34 in order to increase the bending rigidity of the shelf structure 32, and the duct 36 is provided at one side. Loop vibration reduction structure of a large bus, characterized in that the through bar 44 is formed so that the support bar 38 can pass through.