JP4475535B2 - Noise suppression structure for current collector - Google Patents

Description

  The present invention relates to a noise suppression structure for a current collector that suppresses noise generated from the current collector.

  It is known that the aerodynamic noise generated from current collector boats and frameworks contributes to the aerodynamic noise of Shinkansen pantographs, and many studies on aerodynamic noise reduction have been conducted. As a single unit, a considerable reduction in aerodynamic sound is being realized. Recently, as a method for designing a current collector boat for a Shinkansen pantograph, a method for determining the shape of the current collector boat by combining a flow field simulation and an optimization method has also been proposed (see, for example, Patent Document 1). . In this method, the flow field simulation and the shape change by the optimization method can be repeatedly performed by a computer. For this reason, it is not necessary to trial and error a desired shape by a wind tunnel test, a pantograph having an appropriate shape can be obtained, the lift characteristics can be stabilized, and low noise can be realized.

JP 2005-20834 A

  In the conventional pantograph aerodynamic sound reduction structure, even if a current collector boat that achieves low aerodynamic sound by an optimization method is actually mounted on the pantograph, it is between the current collector boat and the framework that supports this current collector boat. Due to the strong aerodynamic interference that occurs, there is a problem that the aerodynamic sound of the entire pantograph is not reduced as much as expected. For example, when comparing the aerodynamic sound between the current collector boat and the optimized collector boat alone, the aerodynamic sound is reduced by about 5 to 10 dB in the optimized collector boat alone compared to the current collector boat alone. However, when the current collector boat and the optimized collector boat are attached to the actual pantograph framework and the aerodynamic sound of the entire pantograph is compared, the comparison of the aerodynamic sound of the current collector boat alone is about 5-10dB Only a difference of about 2 to 3 dB may be recognized. In order to investigate this factor, when the optimized current collector boat was attached to the pantograph framework and the surface pressure distribution and aerodynamic sound distribution were measured, strong aerodynamic interference occurred at the junction between the optimized current collector boat and the framework. The aerodynamic sound source is also localized at the junction between the optimized current collector boat and the frame. For this reason, even if the shape of the current collecting boat is changed, the aerodynamic sound caused by the aerodynamic interference with the frame is not reduced so much that the aerodynamic sound cannot be reduced as expected as a whole.

  The subject of this invention is providing the noise suppression structure of the current collector which can suppress the aerodynamic sound which generate | occur | produces from the junction part of a current collector boat and a framework with simple structure.

The present invention solves the above-mentioned problems by the solving means described below.
In addition, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this embodiment.
The invention of claim 1 is a noise suppression structure for a current collector that suppresses noise generated from the current collector (3), wherein the current collector contacts the trolley wire (1a) of the overhead wire (1). A current collecting boat (7) that supports a sliding plate (7a), a frame (6) that is a link mechanism operable in the vertical direction while supporting the current collecting boat, and an upper end of the frame are supported. Funesasae unit and (6a), wherein said current Denfune as boat support section and leaves at a predetermined interval, and a connecting shaft for connecting this collector boat and the boat support section (9) The connecting shaft connects the front or rear portion of the current collecting boat and the boat support portion, a horizontal support portion (9a) for supporting the current collecting boat from the horizontal direction, and the horizontal support portion in an oblique direction. It is the noise suppression structure (8) of the current collector characterized by comprising an inclined support part (9b) that is supported from above.

According to a second aspect of the present invention, in the noise suppression structure for a current collector according to the first aspect , the connecting shaft includes a melting damage prevention portion (9d) for preventing a melting damage due to a separating arc. This is a noise suppression structure of an electric device.

The invention of claim 3 is a noise suppression structure for a current collector that suppresses noise generated from the current collector (3), and the current collector is in contact with the trolley wire (1a) of the overhead wire (1). A current collecting boat (7) that supports a sliding plate (7a), a frame (6) that is a link mechanism operable in the vertical direction while supporting the current collecting boat, and an upper end of the frame are supported. A boat support portion (6a), and a connecting shaft (9) for connecting the current collector boat and the boat support portion so that the current collector boat and the boat support portion are separated from each other at a predetermined interval. The connecting shaft includes an inclined support portion (9e) for connecting the lower portion of the current collecting boat and the boat support portion and supporting the lower portion of the current collecting boat from an oblique direction. This is a noise suppression structure (8).

According to a fourth aspect of the present invention, in the noise suppression structure for a current collector according to any one of the first to third aspects, the connecting shaft has an outer diameter smaller than that of the frame. It is the noise suppression structure of a current collector.

  According to this invention, the aerodynamic sound generated from the joint between the current collector boat and the frame can be suppressed with a simple structure.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a side view schematically showing a current collector provided with a noise suppression structure for a current collector according to a first embodiment of the present invention. FIG. 2 is a side view of the noise suppression structure of the current collector according to the first embodiment of the present invention.
An overhead line 1 shown in FIG. 1 is an overhead train line installed over the track, and is supported at a support point at a predetermined interval. The trolley wire 1 a is an electric wire that the current collector 3 is in contact with, and supplies a load current to the vehicle 2 when the current collector 3 slides. The vehicle 2 is an electric vehicle such as a train or an electric locomotive, and is a railway vehicle such as a bullet train that travels at a high speed. The vehicle body 2a is a structure for loading and transporting passengers and cargo.

  A current collector 3 shown in FIGS. 1 and 2 is a device for guiding electric power from the trolley wire 1a to the vehicle 2, and includes a base frame 4, an insulator 5, a frame 6, and a current collector boat (hull) 7. And a noise suppression structure 8 and the like. The underframe 4 is a member that supports the frame 6 and is installed on the roof of the vehicle body 2 a and is installed on the insulator 5. The insulator 5 is a member that electrically insulates between the vehicle body 2 a and the underframe 4. The frame 6 is a member that supports the current collecting boat 7, and is a link mechanism that can operate in the vertical direction while supporting the current collecting boat 7. The frame 6 includes a boat support portion 6a, an upper frame 6b, a lower frame 6c, a bent portion (joint portion) 6d, and the like. The boat support portion 6 a is a portion that supports the current collector boat 7, pushes the current collector boat 7 horizontally with respect to the overhead wire 1, and gives the current collector boat 7 a buffer action by a spring. The upper frame 6b is a member that is rotatably connected to the boat support portion 6a, the lower frame 6c is a member that is fixed to a main shaft (not shown), and the bent portion 6d is rotatable between the upper frame 6b and the lower frame 6c. It is a part connected to. The frame 6 is pushed upward by a main spring (not shown) that applies a lifting force. The current collector 3 shown in FIG. 1 is a single arm type pantograph that is asymmetric with respect to the traveling direction of the vehicle 2 (direction A in the figure) and can be used in one direction or both directions. The current collector 3 shown in FIGS. 1 and 2 is moving in the anti-swing direction in which the bent portion 6d is located on the rear side in the traveling direction of the vehicle 2.

  The current collecting boat 7 is a member to which a sliding plate 7a is attached and supported, and is generally an elongated metal member extending in a direction orthogonal to the trolley wire 1a. The current collector boat 7 of the Shinkansen pantograph is formed with a smooth curved surface so as to prevent separation of the flow of the airflow F from the front edge as much as possible. The outer shape of the current collecting boat 7 shown in FIGS. 1 and 2 is optimized by, for example, a method combining the optimization method described in Patent Document 1 and computational fluid dynamics (CFD). As shown in FIG. 2, it is formed in a vertically symmetrical shape. The current collecting boat 7 is formed such that the front end surface and the rear end surface of the vehicle 2 are curved surfaces, the front end surface is generally sunk more than the rear end surface, and the rear end surface is the front side. It is formed in a shape that is narrowed down from the end face. The current collector boat 7 is formed on the same surface (same height) so that no step is formed at the connecting portion (seam) with the sliding plate 7a. As shown in FIGS. 1 and 2, the current collecting boat 7 includes a sliding plate 7a and a horn 7b.

  The sliding plate 7 a is a member that contacts the trolley wire 1 a and is a metal or carbon plate-like member that extends in a direction orthogonal to the traveling direction of the vehicle 2. As shown in FIG. 2, the sliding plate 7 a is inclined downward from the maximum thickness position in contact with the trolley wire 1 a toward the front edge and the rear edge. The sliding plate 7 a is a separate part manufactured separately from the current collecting boat 7, and is attached to the upper surface of the current collecting boat 7 integrally with the current collecting boat 7. The outer shape of the sliding plate 7 a is optimized together with the current collecting boat 7 so that the air flow F flows smoothly and reduces aerodynamic noise while being attached to the current collecting boat 7.

  The horn 7b prevents interruption of the trolley wire 1a in a direction different from the traveling direction of the vehicle 2 out of the two trolley wires 1a intersecting above the branch device when the vehicle 2 passes through the branch device. It is a member for. The horn 7b is a metal member that protrudes from both ends in the length direction of the current collecting boat 7 and has a curved tip.

  The noise suppression structure 8 shown in FIGS. 1 and 2 is a structure that suppresses noise generated from the current collector 3. The noise suppression structure 8 reduces noise generated from a joint portion between the current collecting boat 7 and the frame 6 due to aerodynamic interference. The noise suppression structure 8 includes a connecting shaft 9 as shown in FIGS.

  The connecting shaft 9 is a portion that connects the current collecting boat 7 and the boat support portion 6a so that the current collecting boat 7 and the boat support portion 6a are separated from each other with a predetermined interval. As shown in FIGS. 1 and 2, the connecting shaft 9 connects the rear portion of the current collecting boat 7 and the boat support portion 6a, and horizontally connects the rear portion of the current collecting boat 7 (downstream side of the flow of the airflow F). Support from the direction. As shown in FIGS. 1 and 2, the connecting shaft 9 is formed in an approximately L-shape when viewed from the side so that aerodynamic interference between the current collecting boat 7 and the frame 6 is less likely to occur. Yes. The connecting shaft 9 has a function of reducing aerodynamic noise caused by aerodynamic interference to reduce noise, and as shown in FIG. 1, a portion where the current collecting boat 7 and the boat support portion 6a are joined is possible. It is formed thinner than the frame 6 so as to be as thin as possible. The connecting shaft 9 is formed of, for example, a stainless steel pipe, and has a circular, elliptical, or streamline cross-sectional shape when cut along a plane orthogonal to the central axis. The connecting shaft 9 includes a horizontal support portion 9a, an inclined support portion 9b, a bent portion 9c, a melt damage preventing portion 9d, and the like.

  The horizontal support portion 9a is a portion that supports the current collecting boat 7 from the horizontal direction, and extends in the horizontal direction in parallel with the trolley wire 1a. The front end portion of the horizontal support portion 9a is connected and fixed to the end surface on the rear side of the current collector boat 7 (downstream side of the flow of the airflow F). The inclined support portion 9b is a portion that supports the horizontal support portion 9a from an oblique direction, and is inclined by a predetermined angle θ (for example, around 20 °) with respect to the length direction of the trolley wire 1a. The rear end portion of the inclined support portion 9b is connected and fixed to the boat support portion 6a. The bent portion 9c is a portion that connects the horizontal support portion 9a and the inclined support portion 9b.

  The melt damage prevention part 9d is a part that prevents melt damage due to the arc of separation. The melting prevention unit 9d is supported horizontally with the trolley wire 1a by separating the sliding plate 7a from the trolley wire 1a due to, for example, a decrease in the follow-up performance (following characteristics) of the current collector 3, vibration of the trolley wire 1a, or icing snow When a parting arc is generated with the part 9a, the horizontal support part 9a is prevented from being melted by heat due to the parting arc. The melting prevention portion 9d is, for example, a rubber-like shield material that contains silicone as a main component and cures at room temperature, and is formed by applying this shield material to the outer peripheral surface of the horizontal support portion 9a.

Next, the operation of the noise suppression structure for a current collector according to the first embodiment of the present invention will be described.
As shown in FIGS. 1 and 2, when the outer shape of the current collecting boat 7 is optimized, the aerodynamic sound generated when the vehicle 2 travels in the direction A and receives the flow of the airflow F is generated. Significantly reduced, the lift acting on the current collector boat 7 is stabilized. Even if the outer shape of the current collecting boat 7 is optimized, when the current collecting boat 7 is directly supported by the boat support portion 6 a, aerodynamic noise is generated due to aerodynamic interference between the current collecting boat 7 and the frame 6. End up. On the other hand, as shown in FIGS. 1 and 2, when the connecting shaft 9 connects the boat support portion 6 a and the current collecting boat 7 so that they are separated from each other by a predetermined distance, the frame 6 and the current collecting boat 7 are connected to each other. Aerodynamic noise generated by aerodynamic interference is suppressed.

The noise suppression structure for a current collector according to the first embodiment of the present invention has the following effects.
(1) In the first embodiment, the connecting shaft 9 connects the current collecting boat 7 and the boat support portion 6a so that the current collecting boat 7 and the boat support portion 6a are separated from each other with a predetermined interval. . For this reason, the aerodynamic sound generated by the aerodynamic interference between the current collector boat 7 and the frame 6 can be reduced. As a result, it is possible to realize the excellent low aerodynamic sound that the current collecting boat 7 whose outer shape is optimized originally exhibits.

(2) In the first embodiment, the connecting shaft 9 is provided with a melt damage preventing portion 9d that prevents melt damage due to the arc of separation. For this reason, when the rail 7a leaves | separates from the trolley wire 1a and a separating arc generate | occur | produces between the trolley wire 1a and the horizontal support part 9a, it prevents that the horizontal support part 9a is melted by the heat by this separating arc. be able to.

(3) In the first embodiment, the outer diameter of the connecting shaft 9 is smaller than that of the frame 6. For this reason, when the connecting shaft 9 receives the flow of the airflow F, it is possible to suppress the generation of aerodynamic noise from the connecting shaft 9 as much as possible.

(Second Embodiment)
FIG. 3 is a side view schematically showing a current collector provided with a noise suppression structure for a current collector according to a second embodiment of the present invention. FIG. 4 is a side view of the noise suppression structure of the current collector according to the second embodiment of the present invention. In the following, the same parts as those shown in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.
The current collector 3 shown in FIGS. 3 and 4 is moving in the fluttering direction in which the bent portion 6d is located on the front side of the vehicle 2 in the traveling direction. The connecting shaft 9 connects the front portion of the current collecting boat 7 and the boat support portion 6a, and supports the front portion of the current collecting boat 7 (upstream side of the flow of the airflow F) from the horizontal direction. The front end portion of the horizontal support portion 9a is connected and fixed to the front end surface of the current collecting boat 7, and a shield material such as silicone resin is applied to the outer peripheral surface of the horizontal support portion 9a to prevent arc damage. As a result, a melting prevention part 9d is formed. This second embodiment has the same effect as the first embodiment.

(Third embodiment)
FIG. 5 is a side view schematically showing a current collector provided with a noise suppression structure for a current collector according to a third embodiment of the present invention. FIG. 6 is a side view of the noise suppression structure of the current collector according to the third embodiment of the present invention.
The current collector 3 shown in FIGS. 5 and 6 is moving in the anti-swing direction in which the bent portion 6 d is located on the rear side in the traveling direction of the vehicle 2. The connecting shaft 9 connects the lower part of the current collecting boat 7 and the boat support 6a, and obliquely upwards from the rear side in the traveling direction of the current collecting boat 7 to the front side (from the downstream side to the upstream side of the flow of the airflow F). It extends and supports the lower part of the current collector boat 7 from an oblique direction. As shown in FIGS. 5 and 6, the connecting shaft 9 has a linear outer shape when viewed from the side. The connecting shaft 9 includes an inclined support portion 9e. The inclined support portion 9e is a portion that supports the current collector boat 7 from the inclined direction, and has a predetermined angle θ (for example, with respect to the length direction of the trolley wire 1a). It is tilted only around 20 °. As shown in FIG. 6, the tip end portion of the inclined support portion 9e is connected and fixed to the lower surface of the current collecting boat 7 at the maximum thickness position of the current collecting boat 7, and the rear end portion of the inclined support portion 9e is a boat support. It is connected and fixed to the part 6a. The third embodiment has the same effects as the first embodiment and the second embodiment.

(Fourth embodiment)
FIG. 7 is a side view schematically showing a current collector provided with a noise suppression structure for a current collector according to a fourth embodiment of the present invention. FIG. 8 is a side view of the noise suppression structure of the current collector according to the fourth embodiment of the present invention.
The current collector 3 shown in FIGS. 7 and 8 is moving in the fluttering direction in which the bent portion 6d is located on the front side of the vehicle 2 in the traveling direction. The connecting shaft 9 connects the lower part of the current collecting boat 7 and the boat support 6a, and obliquely upwards from the front side in the traveling direction of the current collecting boat 7 to the rear side (from the upstream side to the downstream side of the flow of the airflow F). It extends and supports the lower part of the current collector boat 7 from an oblique direction. The connecting shaft 9 includes an inclined support portion 9f. The inclined support portion 9f is a portion that supports the current collector boat 7 from an oblique direction, and has a predetermined angle θ (for example, 20 with respect to the length direction of the trolley wire 1a). It is inclined only up and down and extends vertically. The third embodiment has the same effects as the first to third embodiments.

(Fifth embodiment)
FIG. 9 is a side view schematically showing a current collector provided with a noise suppression structure for a current collector according to a fifth embodiment of the present invention. FIG. 10 is a side view of the noise suppression structure of the current collector according to the fifth embodiment of the present invention.
The current collector 3 shown in FIGS. 9 and 10 is moving in the anti-swing direction in which the bent portion 6 d is located on the rear side in the traveling direction of the vehicle 2. The connecting shaft 9 connects the rear portion of the current collecting boat 7 and the boat support portion 6a, and obliquely upwards from the rear side in the traveling direction of the current collecting boat 7 to the front side (from the downstream side to the upstream side of the flow of the airflow F). It extends and supports the rear part of the current collector boat 7 from an oblique direction. As shown in FIGS. 9 and 10, the connecting shaft 9 has a linear outer shape when viewed from the side. The tip end portion of the inclined support portion 9e is connected and fixed to the end surface on the rear side of the current collector boat 7, and a melting damage preventing portion 9d having a predetermined length is formed in a portion near the trolley wire 1a. The fifth embodiment has the same effects as those of the first to fourth embodiments.

(Sixth embodiment)
FIG. 11: is a side view which shows typically the current collector provided with the noise suppression structure of the current collector which concerns on 6th Embodiment of this invention. FIG. 12 is a side view of the noise suppression structure of the current collector according to the sixth embodiment of the present invention.
The current collector 3 shown in FIGS. 11 and 12 is moving in the fluttering direction in which the bent portion 6d is located on the front side of the vehicle 2 in the traveling direction. The connecting shaft 9 connects the front portion of the current collecting boat 7 and the boat support portion 6a, and obliquely upwards from the front side in the traveling direction of the current collecting boat 7 to the rear side (from the upstream side to the downstream side of the flow of the airflow F). The front of the current collector boat 7 is supported from an oblique direction. The tip end portion of the inclined support portion 9e is connected and fixed to the front end face of the current collecting boat 7, and a melting prevention portion 9d having a predetermined length is formed in a portion near the trolley wire 1a. The fifth embodiment has the same effects as those of the first to sixth embodiments.

Next, examples of the present invention will be described.
The current Shinkansen pantograph collector boat (current collector boat) and the collector boat (optimized collector boat) designed to greatly reduce aerodynamic noise by optimizing the shape than the upper frame of the single-arm pantograph Aerodynamic sound was measured in combination with a frame model simulating the upper part. The experiment was conducted in a large, low-noise wind tunnel (circulation type, outlet 2500 x 3000 mm, maximum wind speed 111 m / s, open type measurement unit) in the Railway Technical Research Institute. The aerodynamic sound was measured with an omnidirectional microphone installed at a position 5 m above the current collector boat with a model (test body) installed on the ground plate provided at the same height as the lower end of the nozzle.

FIG. 13 is an external view of a model of a current collector used in a wind tunnel test, FIG. 13A is an external view of an example, and FIG. 13B is an external view of a comparative example.
The embodiment shown in FIG. 13A is a model of a current collecting device whose shape is determined with the intention of suppressing aerodynamic interference between the current collecting boat and the frame as much as possible, as shown in FIGS. The optimized current collector boat and the boat support are connected by a connecting shaft. The comparative example shown in FIG. 13B is a model of a current collector that supports an optimized current collector boat by a framework that simulates the upper frame of the current Shinkansen pantograph.

FIG. 14 is a graph showing the aerodynamic sound measurement results obtained by the wind tunnel test.
The graph shown in FIG. 14 is an aerodynamic sound measurement result at a wind speed of 83.3 m / s, and is a measurement result in the anti-swing direction in which the bent portion (joint portion) of the frame is located on the downstream side of the airflow. The vertical axis is 1/3 octave band noise level (dB (A)), and the horizontal axis is frequency (Hz). The conventional example shown in FIG. 14 is a model of a current collector that supports a current collector boat by a frame that simulates the upper frame of a current Shinkansen pantograph. In any model shown in FIG. 14, the model scale is an actual size, the horn is omitted, and the optimized current collector boat is 900 mm in length.

  As shown in FIG. 14, when comparing the conventional example with the comparative example, the aerodynamic sound in the comparative example is lower than that in the conventional example, but the difference is only 0.6 dB. Comparing the decrease in aerodynamic noise between the current collector boat of the conventional example and the optimized collector boat of the comparative example, the difference between them is 9 dB, and the difference between the conventional example and the comparative example is very small. For this reason, even if the shape of the current collector boat is optimized and aerodynamic noise is greatly reduced by the current collector boat alone, if the suppression of aerodynamic interference between the current collector boat and the boat support is insufficient, It was confirmed that a strong aerodynamic sound was induced and a significant reduction in the aerodynamic sound of the entire pantograph could not be expected.

  On the other hand, comparing the conventional example with the example, the aerodynamic sound of the example is 10.1 dB lower than the conventional example, and the current collector boat of the conventional example and the optimized collector boat of the comparative example are It is almost equal to the difference of aerodynamic sound. For this reason, if the current collector boat and the boat support portion are connected by a connecting shaft at a predetermined interval to reduce aerodynamic interference between the current collector boat and the boat support portion, induction of aerodynamic sound is suppressed, and It was confirmed that the aerodynamic sound reduction effect of the electric boat alone contributed to the reduction of the aerodynamic sound of the entire pantograph.

FIG. 15 is a diagram showing the measurement results of the aerodynamic sound distribution by the wind tunnel test, FIG. 15 (A) is the measurement result of the example, and FIG. 15 (B) is the measurement result of the comparative example.
Next, the sound source search of the aerodynamic sound radiated upward was carried out about the Example and the comparative example using the ellipsoidal sound collecting device with strong directivity. The aerodynamic sound distribution shown in FIG. 15 is a measurement result of the 1250 Hz band. In the comparative example, as shown in FIG. 15 (B), strong aerodynamic sound sources are concentrated near the center of the current collector boat, and the same tendency is shown for frequency bands other than the 1250 Hz band. Since the current collector boat itself has a uniform cross-sectional shape, it can be inferred that the aerodynamic sound was caused by strong aerodynamic interference between the current collector boat and the boat support. This is because, as a result of the aerodynamic interference, an apparently large angle of attack occurs in the center of the current collector boat, which promotes peeling at the rear edge of the current collector boat and strong pressure fluctuations at the top of the boat support. It is considered that a strong aerodynamic sound was radiated due to the induction of. On the other hand, in the example, as shown in FIG. 15A, unlike FIG. 15B, it was confirmed that the aerodynamic sound sources are two-dimensionally distributed on the current collector boat. Therefore, by reducing the size of the boat support, improving the shape of the boat support, and reducing the aerodynamic interference between the current collector boat and the boat support, the reduction effect of the aerodynamic noise of the current collector boat can be reduced to a pantograph. It was confirmed that it contributed to the reduction of the overall aerodynamic sound.

(Other embodiments)
The present invention is not limited to the embodiment described above, and various modifications or changes can be made as described below, and these are also within the scope of the present invention.
In this embodiment, the case where the vehicle 2 moves in the A direction has been described as an example. However, the present invention can also be applied to the case where the vehicle 2 moves in the direction opposite to the A direction. In this embodiment, the single-arm pantograph has been described as an example of the current collector 3, but the present invention can also be applied to other types of pantographs such as a wing-type pantograph and a rhombus-type pantograph.

It is a side view which shows typically a current collector provided with the noise suppression structure of the current collector which concerns on 1st Embodiment of this invention. It is a side view of the noise suppression structure of the current collector according to the first embodiment of the present invention. It is a side view which shows typically a current collector provided with the noise suppression structure of the current collector which concerns on 2nd Embodiment of this invention. It is a side view of the noise suppression structure of the current collector which concerns on 2nd Embodiment of this invention. It is a side view which shows typically a current collector provided with the noise suppression structure of the current collector which concerns on 3rd Embodiment of this invention. It is a side view of the noise suppression structure of the current collector which concerns on 3rd Embodiment of this invention. It is a side view which shows typically a current collector provided with the noise suppression structure of the current collector which concerns on 4th Embodiment of this invention. It is a side view of the noise suppression structure of the current collector which concerns on 4th Embodiment of this invention. It is a side view which shows typically a current collector provided with the noise suppression structure of the current collector which concerns on 5th Embodiment of this invention. It is a side view of the noise suppression structure of the current collector which concerns on 5th Embodiment of this invention. It is a side view which shows typically a current collector provided with the noise suppression structure of the current collector which concerns on 6th Embodiment of this invention. It is a side view of the noise suppression structure of the current collector which concerns on 6th Embodiment of this invention. It is an external view of the model of the current collector used for the wind tunnel test, (A) is an external view of an Example, (B) is an external view of a comparative example. It is a graph which shows the measurement result of the aerodynamic sound by a wind tunnel test. It is a figure which shows the measurement result of aerodynamic sound distribution by a wind tunnel test, (A) is a measurement result of an Example, (B) is a measurement result of a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Overhead wire 1a Trolley wire 2 Vehicle 2a Car body 3 Current collector 6 Frame 6a Boat support portion 7 Current collector boat 7a Sliding plate 8 Noise suppression structure 9 Connection shaft 9a Horizontal support portion 9b Inclination support portion 9c Bending portion 9d Melting prevention portion 9e , 9f Inclined support part F Airflow

Claims (4)

A current collector noise suppression structure that suppresses noise generated from the current collector,
The current collector is
A current collector boat that supports a sliding plate in contact with the trolley wire of the overhead wire,
A framework that is a link mechanism operable in the vertical direction with the current collector boat supported;
A boat support supported by the upper end of the frame;
Wherein said current Denfune as boat support section and leaves at a predetermined interval, and a connecting shaft for connecting this collector boat and the boat support section,
The connecting shaft connects the front or rear portion of the current collecting boat and the boat support portion, a horizontal support portion that supports the current collecting boat from a horizontal direction, and an inclination that supports the horizontal support portion from an oblique direction. Providing a support part;
A noise suppression structure for a current collector characterized by In the noise suppression structure of the current collector according to claim 1 ,
The connecting shaft is provided with a erosion preventing portion for preventing erosion caused by a separating arc;
A noise suppression structure for a current collector characterized by A current collector noise suppression structure that suppresses noise generated from the current collector,
The current collector is
A current collector boat that supports a sliding plate in contact with the trolley wire of the overhead wire,
A framework that is a link mechanism operable in the vertical direction with the current collector boat supported;
A boat support portion supported by the upper end portion of the frame;
A connecting shaft for connecting the current collector boat and the boat support portion so that the current collector boat and the boat support portion are separated from each other with a predetermined interval;
The connecting shaft connects the lower portion of the current collector boat and the boat support portion, and includes an inclined support portion that supports the lower portion of the current collector boat from an oblique direction;
A noise suppression structure for a current collector characterized by In the noise suppression structure of the current collector according to any one of claims 1 to 3 ,
The connecting shaft has a smaller outer diameter than the frame;
The noise suppression structure of the current collector characterized by this.