JP2001171517A - Vehicular outer bellows - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular outer bellows installable in a coupling portion of a high-speed rolling stock, reducing noise during high-speed travelling, and following relative moving of the vehicle. SOLUTION: At a coupling portion 2 of a high-speed rolling stock composed of plural vehicles, this vehicular outer bellows are formed from a coating layer composed of a elastic hood 3 covering the space of the coupling portion and following relative moving of the vehicle, and a great number of fiber layers 4 on an outer surface of the hood 3. Therefore, noise generated from the coupling portion of the high-speed rolling stock can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer hood for a vehicle which is attached to a connecting portion of a railway vehicle, and more particularly to an aerodynamic noise generated from the connecting portion, a rolling noise generated from a bogie, and underfloor. The present invention relates to an outer hood for a vehicle for isolating noise generated from equipment.

[0002]

2. Description of the Related Art With the increase in speed of railway vehicles, aerodynamic noise generated from a connecting portion of the vehicle has increased, and noise at the connecting portion has become a problem. In addition, there is a problem that noise from a bogie or underfloor equipment near the connecting portion leaks outside through the connecting portion. Therefore, attempts have been made to reduce noise, particularly aerodynamic noise, by installing an outer peripheral hood made of an elastic body at the connecting portion. The reason why the elastic top is used is to make the top follow the relative movement of the vehicle. For example, there has been proposed a method of reducing aerodynamic noise by covering a connecting portion with an elastic cover, as in "Vehicle connecting outer hood" described in JP-A-11-198805.

[0003]

However, since it is difficult for the outer hood to follow the relative movement of the connecting portion, practically, the outer hood is attached to each vehicle and the interval between the connecting portions is reduced. Format. In this type of hood, the effect of reducing aerodynamic noise is small, and the effect of shielding underfloor noise cannot be expected.

On the other hand, in the case of a soft outer hood corresponding to the relative movement of the vehicle, there has been a problem that the body of the hood is fanned by the air current and becomes a noise source. In the outer hood disclosed in JP-A-11-198805, in order to maintain the rigidity of the elastic body, an air layer is provided inside the hood and divided into a plurality of cells so that it is possible to follow the movement of the vehicle. However, since the connecting portion cannot be smoothed, aerodynamic noise generated from the step of the outer hood cannot be suppressed.

[0005] The prior art attempts to suppress the generation of aerodynamic noise by smoothing the steps of the connecting portion, but it is difficult to realize a hood that is smooth and follows the relative motion of the vehicle. It was difficult to reduce aerodynamic noise. Further, even if the outer hood can be smoothed, aerodynamic noise is generated due to separation at the connecting portion due to bending of the connecting portion. For this reason, it is necessary to reduce the noise of the connecting portion by a method other than the method of reducing the aerodynamic noise by simply covering the connecting portion with the smoothed hood.

SUMMARY OF THE INVENTION An object of the present invention is to attach to a connecting portion of a railway car running at high speed to reduce noise during high speed running,
Another object of the present invention is to provide an outer hood for a vehicle capable of following the relative movement of the vehicle.

[0007]

Means for Solving the Problems In order to solve the above problems, the following outer hood for a vehicle was invented.

[0008] Aerodynamic noise is generated by fluctuations in the vorticity in the flow. Therefore, if the vorticity generated at the connecting portion can be reduced, the aerodynamic noise can be reduced. Vorticity can be reduced by blowing out the flow from the wall surface, sucking the flow on the wall surface, or by installing a fiber layer on the wall surface and reducing the vorticity by flowing the flow between the fiber and the wall surface. is there. Since it is necessary to follow the relative movement of the vehicle at the connecting portion, if the fiber layer is formed of a large number of fiber layers such as hair, the degree of freedom of deformation against bending deformation can be increased.

Therefore, by disposing a number of fiber layers such as hair on the surface of the hood of the connecting part, the vortex of the connecting part can be reduced, and the hood which can follow the movement of the connecting part can be reduced. It is possible to realize. Since the outer hood according to the present invention has an outer surface that is filled with a number of fiber layers, the shape of the hood of the elastic body inside the outer hood does not need to be smooth, and notches or notches are provided so as to easily follow the connection movement. It is possible to provide a coupling mechanism. Further, by attaching a metal plate inside the hood for each vehicle within a range that can follow the movement of the connection, noise from under the floor can be isolated.

According to the present invention, a noise generated from a connecting portion of a high-speed railway vehicle is reduced, and a railway vehicle with low noise can be realized.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 shows an outer hood 3 attached to a connecting portion 2 of a railway vehicle 1 according to a conventional embodiment. The outer hood 3 may be divided as shown in FIG. 1 or may be integrated so as to cover the outer periphery of the vehicle, and its purpose is to smooth the connecting portion.

FIG. 2 shows an example of an embodiment according to the present invention.
The outer hood for a vehicle according to the present invention is characterized in that an outer hood 3 made of an elastic body that follows the movement of the vehicle is installed in the connecting portion 2, and the outer surface of the outer hood is covered with a plurality of fiber layers 4.

FIG. 3 is a sectional view of the outer hood according to the present invention.
By covering the periphery of the elastic outer top 3 with a large number of fiber layers, the vorticity generated at the connecting portion can be reduced, and aerodynamic noise can be reduced.

FIG. 4 shows the results of a wind tunnel experiment confirming the effect of the present invention. It can be seen that the aerodynamic noise is significantly reduced by installing the fiber layer 4 on the connecting portion 2. Fiber layer 4
Are independent, like hair, and can be deformed freely with respect to the deformation of the elastic outer top 3 to which the fiber layer 4 is attached, so that the relative movement of the connecting portion 2 is not affected. In addition, since the outer top 3 made of an elastic body is not directly exposed to an air current as in the related art, it is not necessarily required to be smoothed. Therefore, as shown in FIGS. A bellows-shaped outer top 31 as shown in FIG. 7 can be attached.

FIG. 8 is a perspective view of another embodiment of the present invention. Noise from the connecting portion includes aerodynamic noise, rolling noise from the bogie 7, and noise from the underfloor equipment 8. The elastic outer top 3 is made of an elastic body to follow the movement of the vehicle. Since it is necessary to use a heavy structure to shield the noise from the bogies and the underfloor equipment, the sound insulation effect is enhanced by installing a metal sound insulation plate 9 inside the outer top 3. However, in order to follow the relative movement of the vehicle, the sound insulating plate 9 is separately mounted for each vehicle as shown in FIG. Since the noise to be sound-insulated is under the floor, it is effective to enhance the sound-insulating effect of the connecting floor.

[0017]

According to the present invention, it is possible to reduce the noise generated from the connecting portion of the high-speed railway vehicle. Because the outer surface of the outer hood is covered with a fiber layer with a high degree of freedom in deformation,
Since there is no need to smooth the surface of the outer hood, the design of the deformation mechanism of the outer hood can be simplified.

[Brief description of the drawings]

FIG. 1 is a perspective view of a conventional vehicle.

FIG. 2 is a perspective view of a vehicle showing an embodiment of the present invention.

FIG. 3 is a sectional view showing an embodiment of the outer hood according to FIG. 2;

FIG. 4 is a characteristic diagram of a wind tunnel experiment result showing the effect of the present invention.

FIG. 5 is a cross-sectional view illustrating an example of an outer hood operating mechanism according to another embodiment of the present invention.

FIG. 6 is a cross-sectional view showing an example of an outer hood operating mechanism according to another embodiment of the present invention.

FIG. 7 is a cross-sectional view showing an example of an outer hood operating mechanism according to another embodiment of the present invention.

FIG. 8 is a sectional view showing another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Vehicle, 2 ... Connection part, 3 ... Outer top, 4 ... Fiber layer, 5 ... Top notch, 6 ... Connection pin, 7 ... Dolly, 8 ... Underfloor equipment,
9 ... Sound insulation board.

Claims (1)

[Claims] An elastic hood covering a connection between high-speed railway vehicles composed of a plurality of vehicles and covering an interval between the connection portions and capable of following relative movement of the vehicle; An outer hood for a vehicle, comprising a large number of fibers on an outer surface.