JPH03155302A - Sound insulator for pantograph - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a pantograph noise device, and particularly to a railway vehicle running at high speed.

[Conventional technology]

In recent years, railway vehicles have become increasingly sophisticated, and noise pollution has become a problem as their running speeds increase. The main sources of this noise are the rolling noise of the wheels and rails, and the sound of the vehicle body.
These include cutting noises and sliding noises between the pantograph's current collection and the overhead wires. Countermeasures have been taken for each of these noises.

Particularly, with regard to noise from the pantograph section, side fences extending upward from the roof are provided on both sides of the pantograph in the width direction of the heavy body. The side barriers prevent the sliding noise between the current collector of the pantograph and the overhead wire from propagating to the side of the track.

Incidentally, related devices of this type include, for example, Japanese Patent Application Laid-Open No. 58-4667.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not take into account the radiation direction of noise from the contact area between the current collector and the overhead wire, that is, the sound source, and the front noise hits the roof surface, which is configured in an upwardly convex shape, and is reflected. There was a risk that the radiation would be emitted in the width direction of the vehicle body. It is also conceivable that the noise is reflected by hitting the side barrier, further reflected by the roof surface, and radiated in the width direction of the vehicle body.

As described above, in the conventional technology, a certain degree of effectiveness can be expected for noise that propagates directly from the sound source, but sufficient consideration has not been given to noise that is reflected and transmitted in the width direction of the vehicle body.

An object of the present invention is to provide a pantograph noise device that can reduce noise propagating in the width direction of the vehicle body.

[Means for Solving Problem 8] In order to achieve the above object, a surface that receives the sound generated from the contact part of the pantograph with the overhead wire is formed below the pantograph in the form of a paraboloid with the sound source as the focal point. It is equipped with blue reflecting means.

[For production]

Since the sound reflecting means has a parabolic surface that receives the sound transmitted from the sound source, it reflects the noise and propagates it vertically upward of the car body, so the reflected noise propagates in the width direction of the car body. Never. Therefore, of the sliding noise generated by contact between the pantograph and the overhead wire, it is possible to reduce the noise that propagates in the width direction of the vehicle body.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. In the figure, 1 is a car body of a railway vehicle, and 2 is a pantograph provided on the roof of the car body 1 (detailed structure is not shown).

Note that S is a sound source that generates sliding noise at the contact portion between the pantograph 2 and the overhead wire. Reference numeral 3 denotes side barriers extending vertically on both sides of the pantograph 2 in the width direction of the vehicle body. On the side surface of the side barrier 3 on the side of the pantograph 2, a plurality of reflecting plates 3m are provided in a comb-like shape, the upper surface of which is a surface that receives noise from the sound source S forming a paraboloid with the sound source S as the focal point. ing. The width of the reflecting plate 31 becomes shorter as it goes upward. Reference numeral 4 denotes a bottom plate disposed below the pantograph 2 between side barriers 3 provided on both sides of the pantograph 2, and whose surface receiving noise from the sound source S is a paraboloid with the sound source S as the focal point. . Reference numerals 5 and 6 denote a front wall and a rear wall arranged to cover the end surfaces of the side barrier 3 and the bottom plate 4, that is, the ends in the longitudinal direction of the vehicle body. By the way, a predetermined gap 7 is provided between the plurality of reflecting plates 3m.

Note that the reflecting plate 3a and the bottom plate 4 are collectively referred to as blue reflecting means.

Further, in the figure, person 1#A2 is an arrow indicating the propagation direction of the noise reflected by the blue reflecting means, and B indicates the propagation direction of the noise transmitted in the width direction of the vehicle body beyond the upper end portion of the side barrier 3. It is an arrow.

In such a configuration, the noise generated from the contact portion between the pantograph 2 and the overhead wire, that is, the sound source $, propagates radially around the sound source S. Among this noise, the noise that propagates downward from the sound source S that affects the vicinity of the orbit propagates as shown by arrows AI, A2, and B in Figure IJ3. That is, the noise transmitted from the sound source S toward the bottom plate 4 is reflected by the surface of the bottom plate 4 and propagates almost vertically upward as shown by arrow A1. Further, noise transmitted from the sound source S toward the reflecting plate 3a is reflected by the upper surface of the reflecting plate 3a and propagates vertically upward as shown by arrow A2.

In this way, since the surface of the bottom plate 4 and the upper surface of the reflector 3g' are each formed into a paraboloid with the sound source S as the focal point, the noise from the sound 5jiS is reflected vertically upward as described above. propagate to

On the other hand, since the height of the side barrier 3 is configured to be within the vehicle limit, it cannot be made very high, and noise propagates beyond the upper end of the side barrier 3 as shown by arrow B.

[
Since it is formed into a paraboloid with focal point 8, it propagates vertically upward. Therefore, it is possible to prevent the noise from the sound source 8 from propagating in the width direction of the vehicle body after being reflected by these sound blocking members. Therefore, the side barrier 3 indicated by arrow B
Coupled with the noise that is transmitted directly across the vehicle width beyond the top of the vehicle, the track i! ! i It is possible to prevent an increase in noise on both sides.

Furthermore, since the reflecting plate 3a is divided into a plurality of parts, the angle of the upper surface, that is, the surface that reflects the noise from the sound source 8, can be arbitrarily selected, and each reflecting surface is formed into a paraboloid with the sound source S as the focal point. Can be formed. Furthermore, by arranging the reflecting plates 3a one on top of the other on the side walls of the side barriers 3 with gaps 7 provided above, the installation area can be reduced.

Further, by filling the gaps between the reflective plates 3a with a sound absorbing material, it is possible to attenuate the sound that enters the gaps 7.

In the spinning example, an example was explained in which the sound reflecting means was installed on the roof, but the same effect can be achieved by providing the sound reflecting means close to the current collection shoe of the pantograph. By bringing the sound reflecting means closer to the current collector shell, the sound reflecting means itself can be made smaller.

〔Effect of the invention〕

As explained above, according to the present invention, noise propagating in the width direction of the vehicle body can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the sound damping device according to the present invention, FIG. 2 is a plan view of FIG. FIG. 2... Pantograph, 3... Side barrier,
3m...Reflector plate, 4...Bottom plate, 5...Front wall. 6... Rear wall,

Claims (1)

[Claims] 1. Below the pantograph provided on the roof of the vehicle body,
A sound blocking device for a pantograph, characterized in that a sound reflecting means is provided in which a surface receiving sound generated from a contact portion of the pantograph with an overhead wire is formed into a paraboloid with the sound source as the focal point. 2. The pantograph sound damping device according to claim 1, wherein the sound reflecting means is constituted by a plurality of reflecting members having a paraboloid with the sound source at the center.