JPH0622404A - Current collector for rolling stock - Google Patents

Abstract

PURPOSE:To provide a current collector for rolling stock in which aerodynamic noise is suppressed at the time of traveling. CONSTITUTION:The current collector for rolling stock comprises a columnar section 11 and an upper bulging part 12 to be jointed with the columnar section 11 at the upper end thereof, wherein the upper bulging part 12 has width W2 enlarging toward the center from the front and rear ends 12a, 12b thereof with the length L2 between front and rear ends being set longer than a maximum width W2 (max). The columnar section 11 has width W1 enlarging toward the center from the front and rear ends 11a, 11b and a slider 16a is disposed in the center on the top face side of the upper bulging part 12 wherein the region on the outside of the opposite ends of the slider 16a is formed of a surface part 12c-1 bending downward from the upper bulging part 12. Since relative air flow, to be produced during travel of vehicle, is pushed aside at the front ends of the columnar section and the bulging part to be fed smoothly along the outer surfaces thereof, aerodynamic noise can be reduced and the inventive current collector can be employed in high speed rolling stock.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a railway vehicle current collector installed on the roof of an electric railway vehicle for taking in electricity from a trolley wire. It relates to reduction of sound (noise).

[0002]

2. Description of the Related Art Conventionally, as a railway vehicle current collector 1 for reducing aerodynamic noise (noise), there is a device shown in FIG.
The same figure (A) is the front view seen from the advancing direction, and the same figure (B).
Is a plan view and FIG. 6C is a partially cutaway perspective view. This conventional device 1 is provided with a columnar column portion 2 and a bow-shaped bulging upper portion 3 that is joined to the upper end of the column body portion. The bulging upper part 3 has horn parts 3b, 3b extending downward from both sides of the main body part 3a in a curved shape, and a sliding plate 4 for collecting current is provided on the upper surface. Reference numeral 7 in FIG. 3B indicates a trolley wire extending in the front-rear direction.

[0003]

By the way, in the conventional device 1, there is a limit to the reduction of aerodynamic noise.
Therefore, as a result of further research to further reduce the aerodynamic noise, the present inventor has found that the relationship between the front-rear end length and the width dimension in the bulging upper part has a great influence on the reduction of the aerodynamic noise. The present invention has been completed which can further reduce the aerodynamic noise generated during traveling.

[0004]

[Means for Solving the Problems] Means adopted by the present invention is a railway vehicle current collector equipped with a sliding plate, comprising a pillar body and a bulging upper portion joined to the upper end of the pillar body. The bulging upper part has a shape in which the width increases from the front and rear ends toward the center, and the length between the front and rear ends is equal to or greater than the maximum width dimension, and the width of the pillar part increases from the front and rear ends toward the center. The sliding plate is provided in the center of the upper surface side of the bulging upper part, and the regions outside both ends of the sliding plate are formed by the downward curved surface of the bulging upper part.

The bulging upper part and the columnar part may have an elliptical shape that is long in the front-rear direction, a shape that is close to this elliptical shape, or a shape that is close to a circular shape or a circular shape. In addition, the column body portion may be vertically expandable and contractable, and an extension / contraction operation tool for performing an extension / contraction operation of the column body portion may be incorporated therein.

[0006]

When the current collecting device for a railway vehicle according to the present invention (hereinafter referred to as "the device of the present invention") is installed on the roof of an electric railway vehicle, a sliding plate is brought into contact with the trolley wire to collect current. be able to. Since the bulging upper portion and the columnar portion have a shape in which the width continuously expands from the front and rear ends of each to the center of each,
Relative air flows generated when the vehicle is traveling are scraped off at their front ends and guided along their outer surfaces. Therefore, in the device of the present invention, the airflow smoothly flows over the bulging upper portion and the outer surface of the columnar portion, so that the aerodynamic noise is further reduced.

[0007]

【Example】

(First Embodiment) FIGS. 1 to 3 show a first embodiment of the device of the present invention, FIG. 1 is a plan view, FIG. 2 is a side sectional view taken along the line EE of FIG. 3 is a front sectional view taken along the line of FIG. In the following description, the front direction is the direction along the traveling direction of the vehicle (arrow A direction), and the left-right direction is the direction along the direction orthogonal to the front direction (arrow B direction).

The device 10 of the present invention according to the present embodiment includes a pillar portion 11 and a bulging upper portion 12 joined to an upper end of the pillar portion 11, and a base portion 13 is provided on a roof 8a of a rail vehicle 8. It is provided with or without intervening. The pillar body portion 11, the bulging upper portion 12, and the base portion 13 are formed by insulating materials such as fiber reinforced synthetic resin at their essential portions.

The columnar portion 11 is formed in an elliptical shape or a shape close to an elliptical shape in plan view (the shape shown by the broken line in FIG. 1), and the width W1 is continuous from the front and rear ends 11a and 11b toward the center. The width W1 becomes maximum at the center (for example, W1 (max) = 1,000 mm),
The front-rear length L1 (for example, L1 = 1,800 mm). The front-rear length L1 is 1.53 which is the maximum width W1 (max).
From the viewpoint of reducing aerodynamic noise, it is preferable to set it to double to 2.0 times.

The column portion 11 is composed of an upper portion 14 and a lower portion 15 which are telescopically fitted to each other.
2, and the lower portion 15 is joined to the base portion 13. The height H1 of the pillar 11 changes by adjusting the amount of fitting between the upper portion 14 and the lower portion 15 (for example,
H1 = 600 to 1,200 mm).

The bulging upper portion 12 is formed in an elliptical shape or a shape close to an elliptical shape in plan view (the shape shown by the solid line in FIG. 1), and the width W2 is increased from the front and rear ends 12a, 12b toward the center.
The width W2 is maximum at the center (for example, W2 (max) = 1,800 mm) and the front-rear length L2 (for example, L2 = 3,300 mm). The front-rear length L2 is 1.5 of the maximum width W2 (max).
From the viewpoint of reducing aerodynamic noise, it is preferably set to 3 times to 2.0 times.

The bulging upper portion 12 is formed by a part of a flat ellipse or a shape approximate to an ellipse, which is a side cross-sectional shape (see FIG. 2) arbitrarily cross-sectioned in a region connected to the columnar portion 11. Has been done. Further, the bulging upper part 12 is formed such that a side cross-sectional shape which is arbitrarily cross-sectioned in a region other than the region connected to the column body part 11 is a flat ellipse or a shape approximate to an ellipse (see a chain line in the figure). ing.

Further, the bulging upper part 12 has a front cross-sectional shape (see FIG. 3) of a central region (a region including a portion where a sliding plate body 16 described later is provided and front and rear portions thereof) of the left and right side surfaces 12c, 12c is a semicircle (for example, radius R2 = 250
mm) and the upper and lower surfaces 12d and 12e are formed to be flat or have a shape (not shown) close to a parabolic shape and have a height H2 (for example, H2 = 500 mm). Further, the bulging upper part 12 is formed by a flat ellipse or a shape close to an ellipse (refer to the alternate long and short dash line in the figure) or a part of this shape in the front cross-sectional shape of the region excluding the central portion. Has been done.

At the center of the upper surface side of the bulging upper portion 12, a sliding plate body 16 which is long in the left and right direction is provided. The sliding plate body 16 is provided with an appropriate number of sliding plates 16a, 16a on the upper surface thereof, and projects slightly by the size E from the upper surface 12d of the bulging upper portion 12 so that the trolley wire 7 does not contact the upper surface 12d of the bulging upper portion 12. Is done. An area outside the both ends 16b, 16b of the sliding plate body 16 is formed by a part 12c-1 of the downwardly curved surface portion 12c of the bulging upper portion 12. This part 12c-1 is
It corresponds to the horn 3b (see FIG. 12) of the conventional pantograph and is formed of a wear resistant material such as steel.

Telescopic operating tools 18, 18 are built in the column body 11 and the bulging upper part 12. Each telescopic operation tool 18 is a forced operation tool 18 including an air cylinder or the like.
a and a compression spring 18b, the lower end 18c is connected to the lower portion 15 of the column portion 11 with or without the base portion 13, and the upper end 18d, which is a stretchable output end, is connected to the bulging upper portion 12. . Each expansion / contraction operation tool 18 is a compression spring 1.
The bulging upper portion 12 is pressed upward by the repulsive elastic force of 8b, and the sliding plate 16a of the sliding plate body 16 is pressed against the trolley wire 7 by an appropriate force.

When the device 10 of the present invention constructed as described above is arranged on the roof 8a of the railroad car 8, the sliding plate 16a can be brought into contact with the trolley wire 7 to collect current. Column part 11
And the bulging upper part 12 has front and rear ends 11a and 11b (1
Widths W1 and W2 from 2a, 12b) to the respective centers
Is a shape that continuously expands, the relative airflow F generated when the vehicle is traveling is scraped off at the front end or the rear end (when the traveling direction of the railcar 8 is opposite to the arrow A direction).
Guide along each outer surface. Therefore, the airflow smoothly flows on the outer surfaces of the bulging upper portion 12 and the columnar portion 11, so that the generated aerodynamic noise is small.

(Second Embodiment) FIGS. 4 to 5 show a second embodiment of the device of the present invention. FIG. 4 is a plan view, and FIG. 5 is a side view of the device viewed from the front along the line of FIG. Is. The device 20 of the present invention according to the present embodiment includes a column body portion 21 and a bulging upper portion 22 joined to the upper end of the column body portion 21, and is arranged on the roof 8a of the rail vehicle 8 via the base portion 23. To be done. Column body 21,
The bulging upper part 22 and the base part 23 are formed of an insulating material such as fiber reinforced synthetic resin.

The columnar portion 21 is formed into a circle or a shape similar to a circle in plan view (the shape shown by the broken line in FIG. 4).
The outer diameter is D1 (for example, D1 = 1,000 mm). The column portion 21 is formed by expanding and contracting a divided upper portion 24 and a lower portion 25. The upper portion 24 is joined to the bulging upper portion 22 and the lower portion 25 is joined to the base portion 23. The height dimension H3 of the column body portion 21 changes by adjusting the amount of fitting between the upper portion 24 and the lower portion 25 (for example, H3 =
600-1,200 mm).

The bulging upper portion 22 is formed into a circle or a shape similar to a circle in a plane outer shape (a shape indicated by a solid line in FIG. 4) and has an outer diameter D2 (for example, D2 = 1,800 mm). The bulging upper portion 22 has a side surface outer shape (see FIG. 2) formed in a flat shape except for a joining region with the columnar portion 21, and the outer peripheral edge portion 2
2c is a semicircle (for example, radius R = 250 mm), and the upper and lower surfaces 22d and 22e are formed flat to have a height H4 (for example, H4 = 500 mm).

The bulging upper portion 22 is located at the center of the upper surface side thereof.
Similar to the first embodiment, the sliding plate body 16 which is long in the left and right is provided. An area outside both ends 16b, 16b of the sliding plate body 16 is formed by a downwardly curved surface portion 22c-1 of an outer peripheral edge portion 22c of the bulging upper portion 22. This part 22c-1
Is formed of a wear resistant material such as steel.

Similar to the first embodiment, an appropriate number of telescopic operating tools 18 are built in the column body 21 and the bulging upper portion 22.

When the device 20 of the present invention constructed as described above is arranged on the roof 8a of the railroad car 8, the sliding plate 16a can be brought into contact with the trolley wire 7 to collect electricity. Column part 21
Since the bulging portion 22 and the bulging upper portion 22 have a columnar shape or a disk shape whose width continuously increases from the front and rear ends to the respective centers, the relative air flow F generated when the vehicle travels is reduced. Scratch at the front edge and guide along the outer surface of each. Therefore, the airflow smoothly flows on the outer surfaces of the bulging upper portion 22 and the columnar portion 21, so that the generated aerodynamic noise is small.

(Third Embodiment) FIGS. 6 to 7 show a third embodiment of the device of the present invention. FIG. 6 is a side sectional view, and FIG. 7 is a front sectional view taken along the line II--N of FIG. Is. The device 30 of the present invention according to this embodiment is different from the first embodiment in that the structure of the column portion 31 and the extension guide 39 are added, and the other configurations are substantially the same as those of the first embodiment. Is.

A part or all of the columnar portion 31 is formed of a bellows portion 31c which can be expanded and contracted, and the remaining portions are rigid portions 31d and 3d.
1e, and adjusts its height dimension H1 (for example, H
1 = 600 to 1,200 mm). The bellows part 31c and the rigid parts 31d and 31e are formed in an elliptical shape or a shape close to an ellipse in a plan view.

The telescopic guides 39 are arranged in pairs inside the column body 31 and the bulging upper part 12 on both left and right sides. In each expansion and contraction guide 39, the center portions of the links 40, 40 are pin-connected 41, one end of each link 40 is pin-connected 42 to the bulging upper portion 12 or the base portion 13, and the other end of each link 40 is bulging upper portion. 12 or the base portion 13 is connected to the base portion 13 so as to be slidable back and forth. The extension guide 39 includes a base portion 13 and a bulging upper portion 1.
The bulging upper part 12 is guided up and down while maintaining the parallel state with 2.

Between the base portion 13 and the bulging upper portion 12,
An appropriate number of telescopic operating tools 18 are provided. Bulge top 1
The telescopic guide 2 is moved up and down by the operation of the telescopic operation tool 18 while maintaining the parallel state with the telescopic guide tool 39.

(Other Embodiments) Although not shown, the columnar portion 21 in the second embodiment (FIGS. 4 and 5) is
It is also possible to form a part or all of the bellows part which is expandable and contractible, and form the remaining part with a rigid part so that the height dimension H3 can be adjusted.

(Test and Results) In order to confirm that the aerodynamic noise (noise) generated by the device of the present invention is smaller than the aerodynamic noise generated by the conventional device, the inventor conducted a test under the following test conditions. Then, the following test results were obtained.

(1) Conditions of test model Each test model corresponding to the conventional device or the device of the present invention is
Each of them is formed by scaling down to 1/10 of the actual product, and each dimension after scaling down is as follows. In the test model corresponding to the conventional device (see FIG. 12), W3 is 188 mm, L3 is 40 mm, H
5 is 20 mm and H6 is 150 mm. In the test model corresponding to the first embodiment of the device of the present invention, W1 (m
ax) is 100 mm, L1 is 180 mm, H1 is 120 mm
mm, W2 (max) is 180 mm, L2 is 330 m
m and R2 are 25 mm and H2 is 50 mm. In the test model corresponding to the second embodiment of the device of the present invention, D1
Is 100 mm, D2 is 180 mm, H3 is 120 mm,
H4 is 50 mm.

(2) Air blowing device and measurement conditions The air blowing device has a 450 mm square air outlet, and a model mounting position is provided 700 mm away from the air outlet toward the front of the air outlet. The microphone that measures aerodynamic noise is 2500 mm directly above the center of the model mounting position.
Position (hereinafter, referred to as “measurement position 1”) and a position 2,500 mm horizontally outside from the center of the model mounting position (hereinafter,
"Measurement position 2"). The flow velocity of the air to be blown is 1 / the assumed vehicle speed (360 km / h)
2 at 180 km / h (50 m
/ S).

(3) Test Results FIGS. 8 to 11 show the results of the 1/3 octave band analysis, which are the test results, with the horizontal axis representing the 1/3 octave band center frequency (Hz) and the vertical axis. Is the 1/3 octave band sound pressure level (dB). 8 to 1
In the drawing of FIG. 1, the mark shows the result at the measurement position 1, and the mark x shows the result at the measurement position 2. FIG. 8 shows the background noise measurement results when the test model is not attached to the model attachment position. FIG. 9 shows the measurement results when a test model corresponding to the conventional apparatus is attached to the model attachment position. FIG. 10 shows the measurement results when the test model corresponding to the first embodiment of the device of the present invention is mounted at the model mounting position. FIG. 11 shows the measurement results when the test model corresponding to the second embodiment of the device of the present invention is mounted at the model mounting position.

(4) Examination of test results Since each test model is scaled down to 1/10 of the actual model and the flow velocity of the blowing air is set to 1/2 of the assumed velocity of the actual vehicle, the following formula 1 is applied. , Frequency in the case of actual vehicle (f
r) is 1/5 of the frequency (fm) in the case of the test model. Therefore, the evaluation of air noise (noise) is 4 in the case of an actual vehicle.
Since it is 0 to 4,000 Hz, it is 2, in the case of the test model.
It may be evaluated by focusing on 000 to 20,000 Hz.

[Equation 1] In Equation 1, fr is the frequency of the actual vehicle, fm
Is the frequency in the case of the test model, Lm / Lr is the scale of the test model with respect to the actual vehicle, Vr is the flow velocity of air in the case of the actual vehicle, and Vm is the flow velocity of air in the case of the test model.

As is clear from the measurement results shown in FIGS. 9 to 11, the aerodynamic sound at 2,000 to 20,000 Hz is higher in the device of the present invention (FIGS. 10 and 11) than in the conventional device (FIG. 9). Small.

[0034]

As described above in detail, according to the present invention, the relative airflow generated when the vehicle is traveling is scraped off at the front ends of the column body portion and the bulging upper portion, and the relative airflow is removed from the column body portion and the bulging upper portion. It can flow smoothly along the surface. As a result, the present invention makes it possible to further reduce the generated aerodynamic noise,
It has the excellent effect of being able to deal with the noise countermeasures that accompany the speeding up of railway vehicles.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment of the device of the present invention.

FIG. 2 is a side sectional view taken along the line EE of FIG.

FIG. 3 is a front cross-sectional view taken along the line Loro of FIG.

FIG. 4 is a plan view of a second embodiment of the device of the present invention.

5 is a side view of the front view taken along the line of FIG.

FIG. 6 is a side sectional view of a third embodiment of the device of the present invention.

FIG. 7 is a front cross-sectional view taken along the line Ni of FIG.

FIG. 8 shows measurement results of background noise without a test model attached.

FIG. 9 shows measurement results with a test model corresponding to a conventional pantograph attached.

FIG. 10 shows measurement results with a test model corresponding to the first embodiment of the device of the present invention attached.

FIG. 11 shows measurement results with a test model corresponding to the second embodiment of the device of the present invention attached.

FIG. 12 shows a conventional railway vehicle current collector, in which FIG. 12 (A) is a front view seen from the traveling direction, FIG. 12 (B) is a plan view, and FIG. It is a perspective view with a part cut away.

[Explanation of symbols]

 11 (21, 31) ... Column part 12 (22) ... Bulging upper part 16a ... Sliding plate 18 ... Telescopic operation tool

Claims (4)

[Claims] 1. A current collecting device for a railroad vehicle, comprising a sliding plate, comprising: a pillar body portion; and a bulging upper portion joined to an upper end of the pillar body portion, the bulging upper portion going from the front and rear ends to the center. The width between the front and rear ends is greater than or equal to the maximum width dimension, and the columnar part has a width that increases from the front and rear ends toward the center. The railcar current collector is characterized in that the sliding plate is provided on the outer surface of the sliding plate, and regions outside both ends of the sliding plate are formed by a downwardly curved surface portion of the bulging upper portion. 2. The current collecting device for a railway vehicle according to claim 1, wherein the planar outer shapes of the bulging upper portion and the columnar portion are elliptical shapes that are long in the front-rear direction or shapes that are similar thereto. 3. A planar outer shape of each of the bulging upper portion and the columnar portion is a circular shape or a shape similar thereto.
The railway vehicle current collector described in. 4. The column body portion is capable of expanding and contracting in the vertical direction, and a telescopic operating tool for operating the column body portion to extend and retract is built in the column body portion. Current collector for railway vehicles.