JP6920180B2 - Windshield cover device - Google Patents

Description

The present invention relates to a windshield cover device mounted on a railroad vehicle and suitable for reducing aerodynamic noise.

Conventionally, the flow of air (air flow) that collides with the current collector is regulated on the front, back, and sides of the current collector (pantograph) mounted on the roof of a railroad vehicle to reduce the noise generated from the current collector. A windshield cover for the purpose is provided. (See, for example, Patent Documents 1 and 2.).

In Patent Document 1, a slope portion that gently rises toward the current collector in the front-rear direction of the current collector in the vehicle traveling direction and the final portion becomes a substantially horizontal top, and an installation area of the current collector between these slope portions are provided. A windshield cover device for a current collector that has at least a cavity to be left and reduces noise during vehicle travel is described. In particular, it is characterized by having a minimum or near length that at least satisfies the required insulation distance between the front and rear walls of the cavity portion in the vehicle traveling direction and the front and rear slope portions of the current collector. A windshield cover device is disclosed.

Due to this feature, the volume of the cavity portion occupying the windshield cover is reduced, and the generation of cavity noise when the airflow from the slope on the front side in the vehicle traveling direction to the slope on the rear side exceeds the cavity portion is reduced. At the same time, the required wall length is shortened corresponding to the length between the front and rear walls of the cavity portion to reduce the weight.

Further, Patent Document 2 discloses a proposal for improving the noise reduction of the windshield cover device of the current collector that reduces the noise during vehicle running described in Patent Document 1. It describes that the maximum height of the windshield cover device should be higher than the height dimension of the support insulator, and that the radius of curvature of each of the front and rear upper edges at the opening of the cavity portion of the windshield cover should be increased. By setting the maximum height of the windshield cover device high, the amount of air flow that collides with the support insulator is reduced, and the noise level is lowered.

Further, by increasing the radius of curvature of each of the front and rear upper edges of the cavity of the windshield cover, the curved surface of the upper edge of the cavity provided on the front side with respect to the vehicle traveling direction rises along the slope. It has the effect of suppressing the air flow from peeling off at the front upper edge, and the curved surface on the rear side with respect to the vehicle traveling direction makes the air flow when the air flow collides with the rear upper edge. It is said that the noise level will be reduced because it is squeezed smoothly.

Japanese Patent No. 3630419 Japanese Unexamined Patent Publication No. 2008-54373

A current collector installed on the roof located high from the rails from the viewpoint of energy saving by reducing the air resistance of railway vehicles and improving safety by lowering the center of gravity and improving running stability. The miniaturization of is important. The windproof cover device of the current collector described in Patent Document 1 is being studied for further miniaturization while enhancing the function of suppressing noise.

In Patent Document 1, the volume of the windshield cover is reduced to reduce the cavity sound generated from the cavity portion, and at the same time, the size of the windshield cover is reduced by making the cavity portion smaller. Further, Patent Document 2 attempts to reduce the noise generated from the windshield cover device by increasing the height of the windshield cover device.

An object of the present invention is to take into consideration that the hull of the current collector is biased in one direction in the front-rear direction of the vehicle traveling direction of the cavity due to the shape of the current collector that is not symmetrical in the front-rear direction of the vehicle traveling direction. It is an object of the present invention to provide a windshield cover device for a current collector in a railroad vehicle, which can realize further reduction in size and weight while preventing noise from the current collector generated when the vehicle is running.

In order to solve the above problems, one of the representative windshield cover devices according to the present invention is provided on one side of the railway vehicle in the longitudinal direction with respect to the current collector provided in the railway vehicle, and is provided in the current collector. A first slope portion having a top that is almost horizontal and a final portion that rises gently toward the current collector, and a final portion that rises gently toward the current collector and is provided on the other side of the rolling stock in the longitudinal direction with respect to the current collector. A second slope portion having a substantially horizontal top, a cavity portion provided with a current collector between the first slope portion and the second slope portion, and both ends of the current collector in the width direction of the railcar. A windshield cover device having a pair of sound insulation walls provided along the longitudinal direction of a railroad vehicle, and the sound insulation wall is provided in such a manner that the central portion of the sound insulation wall in the longitudinal direction is located at the position of the hull provided in the current collector. The second slope portion is arranged at a position closer to the hull than the first slope portion, and the first height dimension of the first slope portion is smaller than the second height dimension of the second slope portion. And.

According to the present invention, it is possible to provide a windshield cover device for a current collector of a railway vehicle, which can prevent noise generated from the current collector when the railway vehicle is traveling and can realize further reduction in size and weight.
Issues, configurations and effects other than those described above will be clarified by the description of the following embodiments.

FIG. 1 is a perspective view of a windshield cover device (Example 1) of a current collector for a railway vehicle of the present invention. FIG. 2 is a side view of the windshield cover device of FIG. FIG. 3 is a plan view of the windshield cover device of FIG. FIG. 4 is a cross-sectional view of the windshield cover device of FIG. 1 at the center in the vehicle width direction. FIG. 5 is a cross-sectional view of the windshield cover device (Example 2) of the current collector for a railway vehicle of the present invention at the center in the vehicle width direction. FIG. 6 is a cross-sectional view of the windshield cover device (Example 3) of the current collector for a railway vehicle of the present invention at the center in the vehicle width direction. FIG. 7 is a cross-sectional view of the windshield cover device (Example 4) of the current collector for a railway vehicle of the present invention at the center in the vehicle width direction. FIG. 8 is a plan view of the windshield cover device (Example 5) of the current collector for a railway vehicle of the present invention. FIG. 9 is a list of the length dimension, the height dimension, and the slope angle of each slope portion shown in the first to fifth embodiments.

Hereinafter, examples will be described with reference to the drawings. First, the directions related to the railcars used in the following description are the longitudinal direction (rail direction) 100 of the railcar 3 (hereinafter referred to as the rolling stock 3), the width direction (pillow direction) 110 of the rolling stock 3, and the longitudinal direction. It is defined as the height direction 120 of the vehicle 3 that intersects the direction 100 and the width direction 110. Hereinafter, it is simply referred to as 100 in the longitudinal direction, 110 in the width direction, and 120 in the height direction. The longitudinal direction 100 is synonymous with the traveling direction of the vehicle 3.

FIG. 1 is a perspective view showing a windshield cover device of a current collector for a railway vehicle according to an embodiment of the present invention, and FIG. 2 is a side view of the windshield cover device of FIG. FIG. 3 is a plan view of the windshield cover device of FIG. 1, and FIG. 4 is a cross-sectional view of the windshield cover device at the center in the vehicle width direction.

The current collector 1 includes a base 7 supported by insulators 5 and 6 on the roof 4 of the vehicle 3, a current collector arm 9 extending diagonally upward from the center of the base 7 in the longitudinal direction 100, and a current collector. A boat body 8 supported by an electric arm 9 is provided. Generally, in a single arm type current collector (see FIG. 1), since the current collector arm 9 extends from the base 7 to one of the longitudinal directions 100, the position of the hull 8 is the longitudinal length of the base 7 of the current collector 1. It is not located in the center of direction 100.

The base 7 is flat in the vertical direction, has a long strip shape in the longitudinal direction 100 of the vehicle 3, and has a streamlined outer shape that is familiar with the air flow and does not easily peel off. The insulator 5 and the insulator 6 support both ends of the base 7 in the longitudinal direction 100, and the insulator 6 also serves as a cable head having a cable (not shown) for distributing the electric power collected from the overhead wire to the vehicle.

The windshield cover device 10 is provided on one side of the current collector 1 in the longitudinal direction 100, and has a slope portion 12a1 having a top portion 12as whose end portion gently rising toward the current collector 1 is substantially horizontal, and the other side. The installation area of the current collector 1 is provided between the slope portion 12b1 and the slope portion 12a1 and the slope portion 12b1 which are provided on the side of the slope and have a top portion 12bs whose end portion which gently rises toward the current collector 1 is substantially horizontal. It is composed of a cavity portion 13 to be left and a pair of soundproof walls 22 in such a manner that the central portion in the longitudinal direction 100 is located on the side of the boat body 8.

The cavity portion 13 has a wall 13a facing the current collector 1 of the slope portion 12a1, a wall 13b facing the current collector 1 of the slope portion 12b1, and both ends of the wall 13a and the wall 13b in the width direction 110 in the longitudinal direction. It is composed of a pair of side walls 13c connected along 100. The central portion of the soundproof wall 22 in the longitudinal direction 100 is provided at both ends of the roof 4 in the width direction 110 in a manner corresponding to the lateral position of the boat body 8 (horn 32) (see FIG. 3).

The current collector arm 9 and the boat body 8 (including the horn 32) located at the height direction 120 from the windshield cover device 10 are exposed to the air flow 21a (see FIGS. 1 and 2), and the aerodynamic resistance is small. The case where the current collector arm 9 or the like is exposed to the air flow 21b and the aerodynamic resistance is large is referred to as an anti-fluttering side. The embodiment of the present invention will be described with reference to Examples 1 to 5 shown below. Note that FIG. 9 shows a list of dimensions of each slope portion described in Examples 1 to 5.

[Example 1]
The longitudinal dimension of the slope portion 12a1 (12b1) provided in the windshield cover device of the first embodiment is La1 (Lb1), the dimension in the height direction thereof is Ha1 (Hb1), and the slope angle is θa1 (θb1). When the dimensions of each part of the slope portion 12b1 are used as the reference dimensions and the dimensions of each part of the slope portion 12a1 are expressed as a ratio, when Lb1 of the slope portion 12b1 is 100 and Hb1 is 100, (θb1 = 14 °) La1 of the slope portion 12a1 is 93, and Ha1 is 93 (θa1 = 14 °). The dimensions of each part of the slope portion 12b1 are reference dimensions with respect to the dimensions of each slope portion shown in Examples 2 to 5 below.

If the height Ha1 of the slope portion 12a1 and the height Hb1 of the slope portion 12b1 are the same, in both the airflow 21a on the fluttering side and the airflow 21b on the anti-fluttering side, the airflow that is bounced up by the slope portion on the upstream side A cavity sound is generated when passing through the cavity portion 13 and colliding with the slope portion on the downstream side.

In particular, when the airflow 21b on the anti-fluttering side collides with the top 12as and the wall 13a of the slope portion 12a1, the soundproof wall 22 does not cover the side of the top 12as, so that the sound insulation effect cannot be expected and a large noise is observed. (See Fig. 2).

According to the embodiment of the first embodiment in which the height dimension Ha1 of the slope portion 12a1 is set to be about 7% smaller than the height dimension Hb1 of the slope portion 12b1, the airflow 21b on the non-fluttering side is not sound-insulated by the soundproof wall 22. In particular, since the flow is less likely to collide with the top 12as), cavity noise can be reduced. At the same time, by making the length dimension La1 of the slope portion 12a1 smaller than Lb1 of the slope portion 12b1 by about 7%, the slope portion 12a1 can be miniaturized, so that the weight reduction of the windshield cover device 10 can be promoted.

[Example 2]
FIG. 5 shows a cross-sectional view of the windshield cover device (Example 2) of the current collector in the vehicle of the present invention at the central portion in the vehicle width direction.
The longitudinal dimension of the slope portion 12a2 (12b2) provided in the windshield cover device of the second embodiment is La2 (Lb2), the dimension in the height direction thereof is Ha2 (Hb2), and the slope angle is θa2 (θb2). When the dimensions of the slope portion 12a2 and the slope portion 12b2 of the second embodiment are expressed as a ratio to the dimensions (reference dimensions) of each portion of the slope portion 12b1 of the first embodiment, Lb2 of the slope portion 12b2 is 93 and Hb2 is 93 (θb2). = 14 °), La2 of the slope portion 12a2 is 65, and Ha2 is 79 (θa2 = 19 °).

If the height dimension Ha2 of the slope portion 12a2 is made smaller than the height dimension Hb2 of the slope portion 12b2, a part of the airflow 21a on the fluttering side that is flipped up by the slope portion 12a2 collides with the upper end portion of the insulator 6 and makes noise. There is concern that it will increase. Therefore, in the second embodiment, this point is improved to make the height dimension Ha2 of the slope portion 12a2 smaller than the height dimension Hb2 of the slope portion 12b2 by about 15%, and the longitudinal dimension La2 of the slope portion 12a2. Is also set to be about 30% smaller than the longitudinal dimension Lb2 of the slope portion 12b2, and the angle θa2 (19 °) of the slope portion 12a2 is set to be larger than the angle θb2 (14 °) of the slope portion 12b2.

By increasing the angle θa2 of the slope portion 12a2, the airflow 21a on the fluttering side passing through the slope portion 12a2 is greatly bounced upward (120 in the height direction), so that the airflow that collides with the upper end portion of the insulator 6 is small. Therefore, the noise generated from the windshield cover device 10 can be suppressed. Further, since the dimension La2 of the slope portion 12a2 in the longitudinal direction 100 can be reduced, the windshield cover device 10 can be reduced in size and weight.

According to the results of the wind tunnel test that verified the effect of Example 2, when the airflow 21a (fluttering side) was passed through the windshield cover device 10 including the current collector 1, the effect of the shape of the slope portion 12a2 (θa2 was set large). Therefore, it has been confirmed that the noise does not increase even when the height dimension Ha2 of the slope portion 12a2 is lowered by about 100 mm from the height of the insulator 5 that supports the base 7 of the current collector 1.

[Example 3]
FIG. 6 shows a cross-sectional view of the windshield cover device (Example 3) of the current collector in the vehicle of the present invention at the central portion in the vehicle width direction.
The longitudinal dimension of the slope portion 12a3 (12b3) provided in the windshield cover device of the third embodiment is La3 (Lb3), the dimension in the height direction thereof is Ha3 (Hb3), and the slope angle is θa3 (θb3). When the dimensions of the slope portion 12a3 and the slope portion 12b3 of the third embodiment are expressed as a ratio to the dimensions (reference dimensions) of each portion of the slope portion 12b1 of the first embodiment, Lb3 of the slope portion 12b3 is 124 and Hb3 is 100 (θb3). = 11 °), La3 of the slope portion 12a3 is 93, and Ha3 is 93 (θa3 = 14 °).

The dimension Lb3 in the longitudinal direction 100 of the slope portion 12b3 is particularly large, and the angle θb3 of the slope portion 12b is reduced to 11 °. With this configuration, the acceleration of the airflow 21b on the anti-fluttering side, which is gently guided upward by the slope portion 12b3, is suppressed and rectification is promoted. Therefore, the flow velocity of the airflow 21b that collides with the boat body 8 of the current collector 1 decreases, and the airflow 21b is rectified to reduce the turbulence. Therefore, noise caused by the airflow 21b that collides with the boat body 8 and the slope portion 12a3. Is suppressed.

In the above, the effect of promoting noise reduction by combining the slope portion 12a1 of Example 1 and the slope portion 12b3 of Example 3 has been described, but when the slope portion 12a2 of Example 2 and the slope 12b3 of Example 3 are combined, In addition to reducing noise, the windshield cover device 10 as a whole can be made smaller and lighter.

[Example 4]
FIG. 7 shows a cross-sectional view of a central portion in the vehicle width direction of the windshield cover device (Example 4) of the current collector in the vehicle of the present invention. The fourth embodiment is a further improvement of the first embodiment in which the height dimension Ha4 of the slope portion 12a4 is set to be smaller than the height dimension Hb4 of the slope portion 12b4. In the fourth embodiment, the radius of curvature of the upper edge portion extending along the width direction 110 is adjacent to the cavity portion 13 (wall 13b) of the slope portion 12a4 as well as the cavity portion 13 (wall 13a) of the slope portion 12a4. In the case where the radius of curvature of the upper edge portion extending along the width direction 110 is Rb, in addition to the embodiment of the first embodiment, the radius of curvature Rb of the upper edge portion of the slope portion 12b4 is changed to the upper edge portion of the slope portion 12a4. It is set larger than the radius of curvature Ra of.

The longitudinal dimension of the slope portion 12a4 (12b4) provided in the windshield cover device of the fourth embodiment is La4 (Lb4), the dimension in the height direction thereof is Ha4 (Hb4), and the slope angle is θa4 (θb4). When the dimensions of each part of the slope portion 12a4 (12b4) of the fourth embodiment are expressed as a ratio to the dimension (reference dimension) of each part of the slope portion 12b1 of the first embodiment, La4 of the slope portion 12b4 is 97 and Hb4 is 97 (θa1 =). 14 °), and the dimensions of each slope portion of the slope portion 12a4 are the same as those in the first embodiment.

The airflow 21a on the fluttering side that is bounced up by the slope portion 12a4 collides with the top portion 12bs4 of the slope portion 12b4, and a cavity sound is generated. However, by increasing the radius of curvature Rb of the upper edge portion of the slope portion 12b4, it is possible to suppress the turbulence of the flow when the airflow 21a collides with the top portion 12bs4 of the slope portion 12b, so that the cavity sound can be reduced. The configuration in which the radius of curvature Rb, which is a feature of the fourth embodiment, is set to be larger than the radius of curvature Ra may be applied to the windshield cover device described in the first to third embodiments.

[Example 5]
FIG. 8 is a plan view of the windshield cover device (Example 5) of the current collector in the vehicle of the present invention.
The fifth embodiment is a further improvement of the first embodiment in which the height dimension Ha5 of the slope portion 12a5 is set to be smaller than the height dimension Hb5 of the slope portion 12b5. In the first embodiment (the same applies to the second to fourth embodiments), the dimension of the width direction 110 of one end of the slope portion 12a1 (12b1) in the longitudinal direction 100 and the dimension of the width direction 110 of the other end are the same. Was set to.

In the fifth embodiment, in addition to the embodiment of the first embodiment, the dimension Wa5u in the width direction 110 of the portion connected to the cavity portion 13 of the slope portion 12a5 is set to be smaller than the dimension Wa5d in the width direction 110 of the start end portion of the slope portion 12a5. At the same time, the dimension Wb5u in the width direction 110 of the portion connected to the cavity portion 13 of the slope portion 12b5 is set to be smaller than the dimension Wb5d in the width direction 110 of the start end portion of the slope portion 12b5.

With this configuration, the width direction 110 dimension D2 between the soundproof wall 22 and the side wall 13c forming the cavity portion 13 is the width direction 110 dimension between the extension line of the soundproof wall 22 in the longitudinal direction 100 and the start end portion of the slope portion 12a (12b). It is set larger than D1. That is, the width direction 110 dimension between the soundproof wall 22 and the slope portion 12a5 (12b5) is R12a (R12b) having a large radius of curvature from the start end portion of the slope portion 12a5 (12b5) toward the side wall 13c forming the cavity portion 13. ), It is characterized by having a slope portion 12a5 (12b5) having a shape that gradually increases (spreads).

With this configuration, when the airflow 21a on the fluttering side or the airflow 21b on the non-fluttering side flows between the soundproof wall 22 and the side surface of the slope portion 12a5 (12b5) regardless of the traveling direction of the vehicle 3, the soundproof wall 22 and Since the dimension D of the width direction 110 between the slope portion 12a5 (12b5) and the slope portion 12a5 (12b5) is gradually widened, the flow velocity is gradually reduced. The wind speed that collides with the horn 32 is also reduced, and the noise generated from the horn 32 can be suppressed. Therefore, it is possible to realize a windshield cover device for the current collector, which can be made smaller and lighter while preventing noise from the current collector generated when the railway vehicle is traveling.

The present invention is not limited to the above-described examples, and includes various modifications. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. It is also possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add, delete, or replace a part of the configuration of each embodiment with another configuration.

For example, the height dimension of the slope, the length dimension of the slope portion, the radius of curvature of the upper edge portion of the slope portion, and the width between the soundproof wall and the slope portion disclosed in Examples 1 to 5. It is possible to appropriately combine the dimensions of the direction 110 and the like, and it is natural that the shape shown by using the radius of curvature is not necessarily limited to a constant radius of curvature.

1 ... Current collector 3 ... Vehicle 4 ... Roof 5, 6 ... Insulator 7 ... Base 8 ... Boat body 9 ... Current collector arm 10 ... Windshield cover device 12a1-12a5, 12b1-12b5 ... Slope 12as, 12bs ... Top La1 ~ La5, Lb1 to Lb5 ... Longitudinal dimensions of the slope portion Ha1 to Ha5, Hb1 to Hb5 ... Vertical dimensions of the slope portion θa1 to θa5, θb1 to θb5 ... Slope angle 13 ... Cavity portion 13a, 13b ... Wall 13c ... Side walls 21a, 21b ... Airflow 22 ... Soundproof wall 32 ... Horn

Claims (5)

A first slope portion provided on one side of the railway vehicle in the longitudinal direction with respect to the current collector provided in the railway vehicle, which gently rises toward the current collector and has a final portion having a substantially horizontal top. ,
A second slope portion provided on the other side of the railway vehicle in the longitudinal direction with respect to the current collector, which rises gently toward the current collector and has a top portion whose final portion is substantially horizontal.
A cavity portion between the first slope portion and the second slope portion and provided with the current collector, and a cavity portion.
A pair of sound insulation walls provided along the longitudinal direction of the railway vehicle at both ends of the current collector in the width direction of the railway vehicle.
It is a windshield cover device that has
The sound insulation wall
It is provided in such a manner that the central portion in the longitudinal direction of the sound insulation wall is located at the position of the hull provided in the current collector.
The second slope portion is arranged at a position closer to the boat body than the first slope portion.
A windshield cover device characterized in that the first height dimension of the first slope portion is smaller than the second height dimension of the second slope portion. In the windshield cover device according to claim 1,
A windshield cover device characterized in that the first slope angle of the first slope portion is larger than the second slope angle of the second slope portion. In the windshield cover device according to claim 1,
The second longitudinal dimension of the second slope portion is larger than the first longitudinal dimension of the first slope portion.
A windshield cover device characterized in that the second slope angle of the second slope portion is smaller than the first slope angle of the first slope portion. In the windshield cover device according to any one of claims 1 to 3.
The second radius of curvature of the upper edge portion that is adjacent to the cavity portion of the second slope portion and extends along the width direction is the upper edge that is adjacent to the cavity portion of the first slope portion and extends along the width direction. A windshield cover device characterized in that it is larger than the first radius of curvature of the portion. In the windshield cover device according to claim 1,
The width direction dimension of the portion of the first slope portion connected to the cavity portion is smaller than the width direction dimension of the first starting end portion of the first slope portion.
A windshield cover device characterized in that the width direction dimension of a portion of the second slope portion connected to the cavity portion is smaller than the width direction dimension of the second starting end portion of the second slope portion.

Images