JP6563307B2 - Single arm type current collector - Google Patents

Description

  The present invention relates to a single arm type current collector that is mounted on a railway vehicle or the like and collects current from a contact overhead line.

One of the noises outside the high-speed railway is aerodynamic noise of the current collector. In vehicles for high-speed railways, noise insulation plates are installed on the left and right sides of the current collector to reduce the noise of the current collector. However, the boat body that contacts the contact overhead wire (for example, the trolley wire) in the current collector is disposed higher than the sound insulation plate. For this reason, it is difficult to block the aerodynamic sound generated from the periphery of the hull by the sound insulation plate, and it is desired to reduce the aerodynamic sound generated from the sound insulating plate.
The inventors of the present invention performed air flow simulation on a conventional current collector for a high-speed railway vehicle. As a result, the hull and the boat support are arranged close to each other and side by side so that the air flow around the boat hull and the air flow around the boat support interfere with each other, and this interference It was found that a relatively large aerodynamic sound was generated from behind the boat support. The boat support section is a portion connected to the boat body to support the boat body. The boat support is provided with one end of a link mechanism (such as a four-bar link) to keep the boat horizontal by turning the arm, and moreover than the arm to maintain high connection strength with the boat. Wide configuration.

  Conventionally, several techniques for reducing aerodynamic sound generated from the periphery of a hull and a boat support have been proposed. For example, Patent Document 1 discloses a technique for reducing noise in this portion by providing a cover on a boat body and a boat support portion. Patent Document 2 discloses that a current collector boat (corresponding to a boat body) and a boat support portion are connected by a connecting shaft so that the current collector boat and the boat support portion are separated from each other. Techniques for reducing the aerodynamic noise that occurs are disclosed.

JP2015-119601A JP 2007-82312 A

  However, the cover configuration of Patent Document 1 can have an outer shape in which the hull and the boat support unit are integrated only when the width in the height direction of the hull is small. The reduction of sound could be expected. When the width in the height direction of the hull is large, in the cover configuration of Patent Document 1, even if the gap between the connecting portions of the two is filled, the hull portion having high air resistance and the boat support portion having high air resistance are close to each other. Moreover, it becomes an external shape like a line. For this reason, the air flow around the boat body and the air flow around the boat support part interfere with each other, and a large pressure fluctuation occurs behind the boat body or the boat support part. And it was thought that a large aerodynamic sound was generated by this pressure fluctuation.

Moreover, in the technique of patent document 2, by separating a boat body and a boat support part, interference of the air which flows into each circumference | surroundings is suppressed, and it can aim at reduction of aerodynamic sound by this. However, in the technique of Patent Document 2, one end of the link mechanism that keeps the boat body horizontal when the boat body is raised and lowered and the boat body are largely separated. For this reason, the moment applied to one end of the link mechanism increases, and there is a problem that the stress concentrated on this portion becomes very large when the hull moves up and down.
The present invention can cope with a current collector having a relatively large width in the height direction of the hull, and it is not necessary to greatly separate one end of the link mechanism from the hull, and the connection portion between the arm and the hull An object of the present invention is to provide a single-arm type current collector that can reduce aerodynamic noise generated from the periphery.

In order to achieve the above object, the present invention is a single arm type current collector comprising a boat body including a sliding plate that contacts a contact overhead wire, and an arm that raises and lowers the boat body by changing an inclination angle. ,
At the end of the arm,
A connection member rigidly connected to the hull;
Constituting a part of a link mechanism that keeps the boat body horizontal when the inclination angle of the arm changes, and at least two pivot shafts coupled to the connection member;
A cover that covers the connecting member including the two rotation shafts;
Is provided,
The direction in which the arm extends from the hull among the directions in which the vehicle advances and retreats is set as the front and the opposite direction to the rear, and the hull is disposed at the rear of at least one of the two rotation shafts. When the body is viewed from the front, the height of the portion hidden by the cover is greater than the height of the portion of the boat body exposed above the cover.

  According to such a configuration, when viewed from the front, the cover provided at the end of the arm hides a part of the hull to a height of more than half and further covers the connection member rigidly connected to the hull. The cover extends. For this reason, the outer shape of the hull part and the connecting part of the arm is integrated, and the flow of air around the hull and the flow of air around the structure that supports the hull interfere with each other. Phenomenon such as doing is reduced. Thereby, the aerodynamic sound which arises from this part can be reduced. Further, such an effect is similarly achieved even when the width of the boat body in the height direction is large, or when the boat body and the two rotation shafts of the link mechanism are arranged close to each other.

Here, the connection member may be connected to a front surface or a bottom surface of the hull, or a front surface and a bottom surface, and the cover may extend to a position covering a rear end of the bottom surface of the hull.
According to this configuration, it is possible to firmly connect the boat body and the arm while realizing the positional relationship between the boat body, the two rotation shafts, and the cover. Furthermore, in the connecting portion between the arm and the hull, turbulence of the air flowing behind the hull is reduced, and aerodynamic noise generated therefrom can be reduced.

Furthermore, the said cover is good to set it as the structure extended to the position which covers at least one part of the back of the said hull.
According to this structure, in the connection part of an arm and a hull, the disturbance of the air which flows behind a hull is reduced, and the aerodynamic sound generated from here can also be reduced.
Further, the cover may be configured to cover the bottom surface of the hull wider in the left-right direction than the portion covering the two rotation shafts.
According to this configuration, the cover allows the air flow to be adjusted by the cover in a range that extends from the connecting portion of the arm and the hull to the left and right of the bottom surface of the hull, thereby aerodynamics generated from this portion. Sound can also be reduced.

Furthermore, the cover has a first cover joined to the arm and a second cover joined to the connection member,
The first cover and the second cover may be configured to be combined so as to be relatively displaceable when the inclination angle of the arm changes and the boat moves while keeping the upper surface horizontal. .
According to this configuration, when the inclination angle of the arm changes and the hull moves while keeping the upper surface horizontal, it is connected to the two rotation shafts of the link mechanism without hindering the movement of the hull. The member can be covered with a cover.

  According to the present invention, it is possible to reduce aerodynamic noise generated from the periphery of the connecting portion between the arm and the boat body. Moreover, it can respond also to a current collector with a relatively large thickness of the hull, and there is no need to greatly separate one end of the link mechanism from the hull.

It is a perspective view which shows the current collector of 1st Embodiment of this invention. The connection part of the current collector's arm which concerns on 1st Embodiment, and a hull is shown, (a) is a side view of the state which removed the cover, (b) is a side view of the state which attached the cover is there. It is a front view which shows the connection part of the arm and ship body of the current collector which concern on 1st Embodiment. The connection part of the arm and ship body of the current collector which concern on 2nd Embodiment of this invention is shown, (a) is a side view of the state which removed the cover, (b) is the state of having attached the cover. Side view, (c) is a partially enlarged view of the joint of the cover. It is a rear view which shows the structure of the cover of the current collector which concerns on 2nd Embodiment. It is a graph which shows the result of a wind tunnel test. It is a side view which shows the connection part of the arm and hull of a current collector which concern on 3rd Embodiment of this invention. It is the perspective view which looked at the connection part of the arm of a current collector which concerns on 4th Embodiment of this invention, and a boat body from the back side.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a perspective view showing a current collector according to the first embodiment of the present invention.
In the present specification, the vertical and horizontal directions mean the directions when the traveling direction of the railway vehicle on which the current collector 1 is mounted is defined as the front direction or the rear direction. As for the front-rear direction, the direction in which the arm 4 extends from the hull 2 is defined as the front of the advancing / retreating direction of the railway vehicle regardless of the traveling direction of the railway vehicle. In the case of a configuration in which a plurality of arm elements are connected to each other by joints, such as the arm 4 in which the first arm 41 and the second arm 42 are connected by the elbow portion 43, the closest to the boat body 2. The direction in which the arm element (in the case of FIG. 1, the first arm 42) extends is defined as the front.

The current collector 1 according to the first embodiment is a single-arm type current collector 1 that is mounted on a railway vehicle and collects power from a contact overhead line, and is mounted on, for example, a high-speed railway vehicle. The current collector 1 includes a boat body 2 that collects power by contacting the contact overhead line, and a pole-shaped guide that guides the contact overhead line from the side to the boat body 2 when the railway vehicle enters the track below the contact overhead line. It has an arc horn 3 and an arm 4 that bends and raises and lowers the boat body 2.
The boat body 2 has a shape that is long in the left-right direction, and includes a sliding plate 21 that contacts the contact overhead wire and a frame body 22 that supports the sliding plate 21. The sliding plate 21 is supported so as to spread on the upper surface of the boat body 2. The boat body 2 may be provided with a structure that supports the sliding plate 21 so as to be displaced in the vertical direction by a spring. At the left end and the right end of the hull 2, a tapered portion 22 a for guiding the contact overhead wire from the arc horn 3 to the upper surface of the hull 2 is provided. The hull 2 has substantially the same width in the up-down direction and the width in the left-right direction, except for the left and right tapered portions 22a.

FIGS. 2A and 2B show a connecting portion between the arm and the hull of the current collector according to the first embodiment, where FIG. 2A is a side view with the cover removed, and FIG. 2B is the state with the cover attached. FIG.
The arm 4 includes a first arm 41 and a second arm 42, an elbow part 43 that connects the first arm 41 and the second arm so as to be bendable, and the hull 2 when the bending degree of the elbow part 43 changes. And a link mechanism 44 (see FIG. 2A) that keeps it horizontal. The arm 4 moves up and down the hull 2 as the degree of bending of the elbow 43 changes and the inclination angle of the first arm 41 changes. Typically, the first arm 41 and the second arm 42 may have a structure having a hollow frame extending in the longitudinal direction and a rod passing through the frame. The link mechanism 44 includes a hollow frame body of the first arm 41 and the second arm 42, a rod body that passes through the frame body (sometimes referred to as a balanced link and a balancing rod), and a connecting member 45 described later. It can comprise from the parallel link which makes a part of. When the inclination angles of the first arm 41 and the second arm 42 are changed, the frame of the second arm 42 and the rod passing through the second arm 42 are relatively displaced, and this displacement is transmitted to the first arm 41. The frame body and the rod body passing through the frame body are relatively displaced. And the connection member 45 moves in parallel by these, and the upper surface of the boat body 2 is kept horizontal.
In the present embodiment, the configuration in which the arm 4 moves up and down the distal end portion by changing the degree of bending of the elbow portion 43 will be described as an example. However, the arm itself is not bent and the arm is centered on the proximal end portion. A configuration in which the tip is moved up and down by swinging and changing the tilt angle of the arm may be applied.
Further, the specific structure of the link mechanism 44 is not particularly limited as long as a similar action can be obtained by a similar link configuration.
At the end of the arm 4, two rotation shafts C <b> 1 and C <b> 2 that constitute two movable parts of the link mechanism 44, a connection member 45 that is rigidly connected to the boat body 2, and a cover 5 are provided. Yes.

The connecting member 45 is rotatably connected to both the rotation axes C1 and C2. The connection member 45 is rigidly connected to the frame body 22 of the boat body 2 with bolts or the like.
The cover 5 covers at least the connecting member 45 and the two rotation shafts C1 and C2 from above and below and from the left and right. The cover 5 is preferably smooth and has an outer shape that is continuous with the outer periphery of the arm 4 with few steps. The cover 5 is made of, for example, a metal plate and is joined to the arm 4.
FIG. 3 is a front view showing the current collector showing a connecting portion between the arm and the boat body of the current collector according to the first embodiment.
In the first embodiment, the connection member 45 is rigidly connected to the front surface portion of the frame body 22 (see FIG. 2A). Moreover, the boat body 2 is arrange | positioned in the back of the upper rotation axis C1 among the two rotation axes C1 and C2. That is, the upper end of the rotation axis C1 is higher than the lower end of the hull 2 (the lower end of the left and right center portion of the hull 2).

Due to such an arrangement relationship, the cover 5 is arranged so as to hide more than half of the hull 2 in the height direction when the hull 2 is viewed from the front (see FIG. 3). That is, when the hull 2 is viewed from the front, the height h2 of the portion hidden by the cover 5 is longer than the height h1 of the portion exposed above the cover 5. Further, the cover 5 extends to a position close to the hull 2 as shown in FIG.
With such a cover 5, the outer shape is such that the boat body 2 and the connecting portion of the arm 4 are integrated. As a result, the phenomenon that the flow of air around the hull 2 and the flow of air around the cover 5 interfere with each other to produce large pressure fluctuations is reduced, and aerodynamic noise generated from this portion is reduced. Can do.

(Second Embodiment)
FIG. 4 shows a connecting portion between the arm and the hull of the current collector according to the second embodiment of the present invention, (a) is a side view with the cover removed, and (b) is the cover. The side view of the state which attached | subjected (c) is the elements on larger scale of the joint of the cover. FIG. 5 is a rear view showing the structure of the cover of the current collector according to the second embodiment.
The current collector 1A according to the second embodiment mainly differs from the structure according to the first embodiment in the structure of the cover and the support structure of the boat body 2, and the other parts are the first embodiment. It is the same as that of the form. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIG. 4A, the connection member 45A of the second embodiment extends from the front end to the rear end of the bottom surface of the boat body 2 and is rigidly connected to the bottom surface of the boat body 2 by bolts. Yes.
As shown in FIGS. 4B and 5, the cover 5 </ b> A according to the second embodiment includes a first cover 51 joined to the arm 4 and a second cover 52 joined to the connection member 45 </ b> A. The When the bending degree of the arm 4 is changed and the boat body 2 and the connecting member 45A are moved up and down, the first cover 51 and the second cover 52 are relatively displaced, and the relative displacement between the arm 4 and the boat body 2 is achieved. Follow.
In the portion where the first cover 51 and the second cover 52 are joined, a part of the first cover 51 is overlapped with a part of the second cover 52 so that the joint portions of both are continuously connected. . Further, as shown in FIG. 4C, a curved surface R1 centering on the rotation axis C1 is formed at the joint portion of the upper and lower portions of the cover 5, and the second cover 52 is centered on the rotation axis C1. Even if it rotates, there is no large gap between the first cover 51 and the second cover 52. Further, a chamfer may be provided on the edge of the first cover 51 so that a steep step does not occur at a portion where the first cover 51 overlaps the outside of the second cover 52.

As shown to Fig.4 (a), also in 2nd Embodiment, the boat body 2 is arrange | positioned in the back of the upper rotating shaft C1 among the two rotating shafts C1 and C2. That is, the upper end of the rotation axis C <b> 1 is at a position higher than the lower end at the center in the left-right direction of the boat body 2. Further, the cover 5A is arranged so as to hide more than half of the hull 2 in the height direction when the hull 2 is viewed from the front. That is, when the hull 2 is viewed from the front, the height of the portion hidden by the cover 5A is longer than the height of the portion exposed above the cover 5A (see FIG. 4B). ). Further, the cover 5 </ b> A extends to a position close to the boat body 2.
In the second embodiment, the cover 5 </ b> A (second cover 52) is further provided up to the rear end of the bottom surface of the boat body 2. Thereby, in the connection part of the arm 4 and the boat body 2, the turbulence of the air which flows behind the lower part of the boat body 2 reduces, and the aerodynamic sound generated from here can also be reduced.

FIG. 6 is a graph showing the results of a wind tunnel test of the current collector.
Subsequently, a wind tunnel test performed on each single arm type current collector of the standard shape, the first embodiment, and the second embodiment will be described. The standard-shaped single-arm current collector is a conventional configuration in which the boat body 2 is disposed above the rotation axes C1 and C2 of the link mechanism 44.
In this wind tunnel test, air was flowed in parallel with the upper surface of the hull from the front of the hull to the rear of the connecting part between the arm and hull, and the noise level was measured with a microphone set at a predetermined position. . The wind speed was 80 m / sec (288 km / h). The position of the microphone was a position 2 m on the side of the hull and 1 m below the hull, with the center at the top of the hull as the origin.
As shown in the graph of FIG. 6, according to the current collector 1 of the first embodiment and the current collector 1A of the second embodiment, the noise level is reduced in a wider frequency range than the standard shape. It was confirmed that

(Third embodiment)
FIG. 7 is a side view showing a current collector according to the third embodiment of the present invention.
The current collector 1B of the third embodiment is obtained by changing the shape of the second cover 52 of the current collector 1A of the second embodiment, and the other configurations are substantially the same as those of the second embodiment. . About the substantially same structure, the same code | symbol as 2nd Embodiment is attached | subjected and detailed description is abbreviate | omitted.
The cover 5B according to the third embodiment includes a first cover 51 joined to the arm 4 and a second cover 52B joined to the connection member 45A. The second cover 52 </ b> B extends to the bottom portion of the boat body 2 and a part of the rear of the connecting portion between the arm 4 and the boat body 2, and is tapered to smooth the air flow behind the boat body 2. f1 is provided.
According to the current collector 1B of the third embodiment, the turbulence of the air flowing behind the hull 2 is reduced at the connecting portion between the arm 4 and the hull 2, and aerodynamic sound generated therefrom is reduced. Can do.

(Fourth embodiment)
FIG. 8: is the perspective view which looked at the connection part of the arm and ship body of a current collector which concern on 4th Embodiment of this invention from the back side.
The current collector 1C according to the fourth embodiment is obtained by changing the shape and range of the second cover 52 of the current collector 1A according to the second embodiment, and other configurations are substantially the same as those of the second embodiment. Are the same. About the substantially same structure, the same code | symbol as 2nd Embodiment is attached | subjected and detailed description is abbreviate | omitted.
The cover 5C of the fourth embodiment includes a first cover 51 joined to the arm and a second cover 52C connected to the connection member 45A. The second cover 52C covers the bottom surface of the boat body 2 in a wider range in the left-right direction than the portion of the first cover 51 that covers the rotation axes C1, C2. The second cover 52C may further be configured to cover a part of the rear of the hull 2 in a wide range. A taper may be provided in a portion that covers the hull 2 in a wide range in the left-right direction so as to be continuous with the outer surface of the hull 2.

According to the current collector 1 </ b> C of the fourth embodiment, the cover 5 </ b> C can add a gentle outer shape in a range extending from the connecting portion of the arm 4 and the hull 2 to the left and right of the bottom surface of the hull 2. Thus, the turbulence of the air flowing through this portion is reduced, and aerodynamic sound generated therefrom can be reduced.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and details shown in the embodiments can be appropriately changed without departing from the spirit of the invention. is there.

1, 1A, 1B, 1C Current collector 2 Ship body 3 Arc horn 4 Arm 5, 5A, 5B, 5C Cover 41 First arm 42 Second arm 43 Elbow 44 Link mechanism 45, 45A Connection member 51 First cover 52 , 52B, 52C Second cover C1, C2 Rotating shaft

Claims (5)

A single-arm type current collector comprising a boat body including a sliding plate that contacts a contact overhead wire, and an arm that raises and lowers the boat body by changing an inclination angle,
At the end of the arm,
A connection member rigidly connected to the hull;
Constituting a part of a link mechanism that keeps the boat body horizontal when the inclination angle of the arm changes, and at least two pivot shafts coupled to the connection member;
A cover that covers the connecting member including the two rotation shafts;
Is provided,
The direction in which the arm extends from the hull among the directions in which the vehicle advances and retreats is set as the front and the opposite direction to the rear, and the hull is disposed at the rear of at least one of the two rotation shafts. A single arm type current collector, wherein the height of the portion hidden by the cover is larger than the height of the portion exposed above the cover in the boat body when the body is viewed from the front . The connection member is connected to the front or bottom of the hull, or the front and bottom.
The single-arm type current collector according to claim 1, wherein the cover extends to a position covering a rear end of the bottom surface of the boat body.   The single-arm type current collector according to claim 2, wherein the cover is extended to a position covering at least a part of the rear of the boat body.   The single-arm type current collector according to claim 2 or 3, wherein the cover covers a bottom surface of the hull wider in the left-right direction than a portion covering the two rotation shafts. apparatus. The cover has a first cover joined to the arm and a second cover joined to the connection member,
The first cover and the second cover are combined so as to be relatively displaceable when the inclination angle of the arm changes and the boat moves while keeping the upper surface horizontal. The single arm type current collecting device according to any one of claims 1 to 4.

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