JP4628733B2 - Current collector with movable cover - Google Patents

Description

  The present invention relates to a current collector for a railway vehicle.

As the speed of railway vehicles increases, the noise generated increases, and the demand for environmental conservation is expected to increase in the future. Among them, in recent high-speed vehicles, current collectors are the parts that are most required to reduce noise, and aerodynamic noise, which is the main noise source generated from the current collectors, and a request to reduce arc noise due to disconnection. Is growing.
In response to such demands, there are active control current collectors that reduce arc noise and reduce wear on overhead wires. Conventionally, in such a current collector, a structure using a sliding packing having a watertight holding function at interpenetrating portions of relative displacement members driven at different frequencies has been studied (see FIG. 14 of Patent Document 1). .
Japanese Patent Application 2001-132461

Generally, a vehicle collects current from an overhead line located above it. The current collector is Installation on the vehicle body upper portion to project the current collector from the collapsed state when traveling to the overhead wire height. The overhead line height is displaced upward and downward with respect to the standard height depending on the location. The current collector is provided with a drive mechanism that moves the current collector up and down following the displacement of the overhead line.

  In the above-described current collector, a plurality of mechanisms that are driven at different frequencies are provided in order to improve the follow-up performance to the displacement of the overhead wire. Further, the entire drive mechanism is covered with a cover in order to protect the drive mechanism from wind and rain and dust, and to reduce aerodynamic noise generated from the drive mechanism. In the case of such a structure, conventionally, a sliding packing structure having a watertight holding function has been studied in order to make the interpenetrating portions of members driven at different frequencies such as a cover and a current collector have a watertight structure.

  This sliding packing structure is installed in the annular gap between the current collector and the cover, and the current collector and the cover are relatively displaced by the smooth sliding surface provided at the bottom of the current collector and the packing installed on the cover. Even so, the structure prevents outside rainwater, dust, etc. from entering the cover.

  However, in this conventional structure, a frictional force due to the tightening force of the packing works for the circumference of the sliding surface. In addition, since the current collector receives a force due to contact with the overhead wire or wind pressure, and the cover receives a force due to the wind pressure, the frictional force applied to the sliding surface increases, both of which increase the load of the current collector and the driving force of the cover. However, the dynamic response becomes worse.

  The sliding surface on the current collector side must have a smooth surface with a uniform cross-sectional shape required for the vertical movement stroke. When the current collector is folded, the maximum sliding stroke distance in the vertical direction is It needs to be stored inside the cover. A space required for the drive mechanism, which is fixed to the lower end of the current collector and moves the current collector up and down, to move down by the maximum displacement dimension is necessary between other structures inside the cover. The external dimensions of the electric device when folded are increased.

  In addition, the sliding surface must have a smooth and uniform cross-sectional shape, and if the current collector is displaced upward, the sliding surface is exposed to the airflow, which causes Karman vortices in the wake and aerodynamic noise sources. It becomes.

  An object of the present invention is to secure dynamic response with low driving force in a current collector of a railway vehicle, to reduce the outer dimensions when the current collector is folded, and to provide an integrated portion between the current collector and the cover. It is an object of the present invention to provide a movable cover structure for a current collector having a structure that reduces aerodynamic noise.

  In order to achieve the above-mentioned object, in the present invention, the current collector cover and the current collector are installed at a portion where they pass through each other, and are composed of a plurality of annular flat plates and an elastic body, and the lower surface of the annular flat plate is fixedly connected by the elastic body Structure. Usually, the annular flat plate is arranged horizontally so as to form a smooth surface. When the current collector is lifted and displaced with respect to the cover, the annular flat plate is displaced in a stepped shape projecting upward, and the rising surface of the staircase forms a plurality of lateral V-shaped annular concave surfaces, The envelope surface of the annular flat plate is deformed into an elliptical cone. In addition, when the current collector moves downward relative to the cover in order to fold the current collector, the annular flat plate is displaced downward in a stepped manner with respect to the cover, and the envelope surface of the annular flat plate has an elliptical cone shape. A movable cover having a structure that can be transformed into

  As described above, according to the present invention, the large diameter of the movable cover having the structure in which the annular flat plate divided into a plurality of portions and the lower surface thereof are fixedly connected by the elastic body at the current collecting device cover and the current collecting portion. Secure the side to the current collector cover and the small diameter side to the current collector. Usually, the current collector is controlled only by driving the current collector cover so that the current collector follows the low frequency displacement of the overhead line height, and the annular flat plate maintains the horizontal plane. Further, when the current collector is displaced upward, each annular flat plate is displaced stepwise, and the rising surface of the step forms a plurality of laterally V-shaped annular concave surfaces, so that the movable cover has an air flow. The correlation length in the span direction of the Karman vortex generated by exposure to the air is reduced, and the aerodynamic noise generated can be reduced. When the current collector is folded, the packing sliding surface is not necessary for collecting current as in the conventional case, so that the folding height of the current collector can be reduced accordingly.

  Examples of the present invention will be described below.

  FIG. 1 shows a side view of a current collector showing an embodiment of the present invention. FIG. 2 shows a plan view of the movable cover 5a. The current collector is installed on the roof of the vehicle body. The current collector 201 protrudes upward in order to collect power by contacting the overhead wire 1 during traveling. The current collector 201 is composed of a boat body 2 and an insulator 3. The boat body 2 is in contact with the overhead wire 1, but the lower portion of the boat body 2 is fixedly supported by an insulator 3, and the lower portion is connected to a drive mechanism (not shown) that drives the current collector 201. The current collector has a cover 4 that covers the drive mechanism. The cover 4 is divided into a plurality of parts, and is vertically expanded and contracted by a drive mechanism (not shown). The height of the overhead wire 1 is displaced depending on the location. In order to follow the displacement of the height, the insulator 3 and the cover 4 are driven by different drive mechanisms having the necessary responsiveness. The structure is relatively displaced. The relative displacement of the insulator 3 and the cover 4 are connected by a movable cover 5a.

  FIG. 3 is a detailed cross-sectional view of the movable cover 5a viewed from the AA direction in FIG. The concentric circular or elliptical annular flat plate 202 divided into a plurality of parts is constituted by 101a, 101b, 101c, and the lower surfaces of the adjacent annular flat plates are fixedly connected by an elastic body 102. The inner diameter side 101c of the annular flat plate is fixed with the insulator flange 103 and the waterproof packing 103a interposed therebetween, and the outer diameter side 101b is fixed with the cover flange 104 with the waterproof packing 104a interposed therebetween. The cross-section of the annular flat plate is chamfered so that the upper and lower surfaces have an angle of 7 to 10 ° or less with respect to the plane, and the tip is rounded to form a dish-like cross-sectional shape. Further, a bush 108 a having low frictional force and low wear is inserted into a mounting hole 108 provided in the lower portion of the elastic body 102, and a rigid support rod 107 passes through the central hole. One end of the support rod 107 is connected to the annular flat plate 101c by a mounting bracket 105 that can be rotated in the vertical direction, and the other end is connected to the annular flat plate 101b by a mounting bracket 106 that can rotate and linearly move the support rod. . The mounting bracket 106 includes a hinge 106a that can rotate in the left-right direction, and a roller 106b that can rotate in a vertical position with the support rod 107 interposed therebetween.

  As shown in FIGS. 1 and 3, the current collector 201 has a low frequency (about 0.01 Hz) within the fluctuation range of the overhead line height of the main line where the vehicle runs at high speed (standard height ± 100 mm in the case of the Shinkansen). Priority control is performed so as to respond mainly to the vertical movement of the cover 4 with respect to the vertical displacement, and the upper surface of the annular flat plate 202 is made as horizontal as possible to suppress the generation of aerodynamic noise during high-speed running.

  FIG. 4 shows a case where the overhead line height rises to near the maximum working height of the current collector when traveling at a low speed. The cover 4 extends to the maximum limit. When the lower surface of the insulator 3 rises to the maximum limit in the vertical direction with respect to the upper surface of the cover 4, the outer diameter side of the movable cover 5b fixed to the cover 4 increases. The inner diameter side of the movable cover 5b fixed to the insulator 3 is displaced upward in a convex step shape, and its outer envelope surface is deformed into an elliptical cone shape.

  FIG. 5 shows a detailed cross-sectional view when the movable cover 5b is deformed in the state of FIG. The viewing direction is the same as AA in FIG. The reference numerals conform to FIG. When the insulator flange 103 is displaced upward relative to the cover flange 104, the annular flat plate 202 divided into a plurality is horizontally displaced stepwise by the pushing force of the support rod 107. A step is generated by the displacement of the insulator flange 103, but since the lower part of the adjacent annular flat plate 202 is fixedly connected by the elastic body 102, there is no gap between the steps, and rainwater or the like cannot enter the current collector. Absent. A stepwise rising surface of the movable cover whose outer envelope surface is deformed into an elliptical conical shape has a structure in which a lateral V-shaped annular concave surface composed of an annular flat plate 202 and an elastic body 102 is arranged. In this structure, as seen in the shaded insulation folds of the insulator 3, the airflow is divided by providing a plurality of annular concave surfaces, the vortex diameter of the vortex created is reduced in each annular concave surface, and The correlation length in the span direction of the vortex becomes shorter. Therefore, noise generated from the movable cover 5b whose outer envelope surface is deformed into an elliptical cone shape is reduced.

In addition, due to wind pressure received during high speed traveling, the annular flat plate rises and deformation of the elastic body necessary for forming the annular concave surface together with the elastic body is hindered . It is necessary to prevent the elastic body from being deformed by an excessive external force. Even when the insulator flange 103 is displaced upward and the elastic body 102 is exposed to the airflow, the support rod 107 supports the elastic body from below, and the deformation / deflection of the elastic body due to wind pressure is reduced, and the annular flat plate is made as much as possible. Hold at regular intervals.

  As in FIG. 3, the support rod 107 passes through a bush 108 a provided in the mounting hole 108 of the elastic body 102, and both ends are connected by mounting brackets 105 and 106. When the insulator flange 103 is displaced upward, the support rod 107 is rotated by the mounting bracket 105, and the support rod 107 is rotated and slid in the linear direction by the mounting bracket 106, so that the support rod 107 is smoothly displaced upward and is elastic. The lower part of 102 is supported, and it deform | transforms like FIG.

  FIG. 6 shows a side view of the current collector folded. When the current collector is folded, the insulator 3 must be sunk inside the cover 4 so that the current collector folding height is lower than the vehicle limit height 6. The movable cover 5c has a stepped concave surface on the inner diameter side fixed to the insulator 3 with respect to the outer diameter side fixed to the cover 4, and the outer envelope surface thereof has an elliptical cone shape.

  FIG. 7 shows a detailed cross-sectional view of the movable cover 5c. The viewing direction is the same as AA in FIG. The reference numerals conform to FIG. When the insulator flange 103 is displaced downward relative to the cover flange 104, the plurality of divided annular flat plates 202 are displaced stepwise. Although the elastic body 102 which adheres and connects the lower parts of the adjacent annular flat plates 202 is deformed as shown in FIG. 7, the movable cover 5c has a concave surface in a stepped manner downward, and its outer envelope surface is deformed into an elliptical cone shape. It is sufficient that there is a space that can be accommodated in the cover by the stroke dimension required for the insulator flange 103 to move down with respect to the cover flange 104. For this reason, it is not necessary to secure a space in which the drive mechanism for the maximum stroke descends and displaces unlike the sliding packing structure, so that the folding height dimension of the current collector can be reduced by the difference.

  FIG. 8 shows a second embodiment of the present invention in the mounting bracket 106 of FIG. The mounting bracket 106 needs to have a structure that allows the support rod 107 to rotate and linearly move. However, when the movable cover 5a is displaced, it is desirable that the mounting bracket portion can move with low friction and wear. Therefore, in FIG. 3, the rotating roller 106 b is used as a structure capable of linear motion like the mounting bracket 106. In the second embodiment, instead of the rotating roller 106b, a low friction and low wear bush 301 is inserted into the mounting hole 109 at the tip of the hinge 106a that rotates, and the support rod 107 passes through the center thereof. Enable smooth linear motion.

  FIG. 9 shows a third embodiment of the present invention that replaces the mounting bracket 106 of FIG. In the third embodiment, a spherical bearing 302 that allows both rotation and linear motion is installed at the lower end of the annular flat plate 101b fixed to the cover flange 104 of the annular flat plate 202. The spherical bearing 302 has a structure in which the support rod 107 can smoothly rotate in the vertical direction by rotating the bearing itself while smoothly performing linear motion of the support rod.

The side view which shows the 1st Embodiment of this invention. The top view which shows the 1st Embodiment of this invention. Sectional detail drawing explaining the structure of this invention seen from the AA direction of FIG. FIG. 2 is a side view of the current collector shown in FIG. Sectional detail drawing explaining the structure of the movable cover 5b of FIG. The side view which shows the state at the time of current collector folding of FIG. Sectional detail drawing explaining the structure of the movable cover 5c of FIG. The figure which shows the 2nd Embodiment of this invention in the reference number 106 of FIG. The figure which shows the 3rd Embodiment of this invention in the reference number 106 of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Overhead 2 Ship body 3 Insulator 4 Cover 5a, 5b, 5c Movable cover 6 Vehicle limit height 101a, 101b, 101c Annular flat plate 102 Elastic body 103 Insulator flange 103a Waterproof packing 104 Cover flange 104a Waterproof packing 105 Mounting bracket 106 Installation Metal fitting 106a Hinge 106b Roller 107 Support rod 108 Mounting hole 108a Bush 109 Mounting hole 201 Current collector 202 Annular flat plate 301 Bush 302 Spherical bearing

Claims (5)

  A boat body that collects electricity in contact with the overhead wire; a current collector configured by an insulator that fixes and supports the boat body on an upper portion thereof; and a drive mechanism that drives the current collector to maintain contact with the overhead wire. In the railway vehicle current collector comprising a cover that covers the drive mechanism, an annular flat plate that is installed at an interpenetrating portion of the current collector and the cover that are relatively moved up and down and divided into a plurality of parts, and the annular The lower surface of the flat plate is fixedly connected by an elastic body, and usually the annular flat plate forms a horizontal plane, and the movable flat cover is displaced stepwise when the current collector is displaced in the vertical direction with respect to the cover. Current collector with movable cover.   The current collector with a movable cover according to claim 1, wherein when the current collector is lifted and displaced with respect to the cover, the elastic body fixed to the lower surface of the annular flat plate divided into a plurality of parts is deformed, and the annular flat plate Are horizontally displaced in a stepwise manner, and the elastic body between the annular flat plates forms a laterally V-shaped annular concave surface.   The current collector with a movable cover according to claim 1 or 2, wherein the lower portion of the elastic body is supported and guided at a plurality of locations by a support rod, one end of the support rod is a mounting bracket that can be rotated in the vertical direction, and the other end is a hinge. A current collector with a movable cover, characterized in that it is constituted by a roller and is supported by a mounting bracket capable of rotating and linearly moving the support rod. In current collector with a movable cover according to claim 3, wherein one end of the supporting rod in a rotatable mounting bracket in the vertical direction, the other end lateral direction rotatable hinge and support rods that Do a linearly movable Bush by the support structure with the movable cover current collector, wherein at composed mounting bracket.   The current collector with a movable cover according to claim 3, wherein one end of the support bar is a mounting bracket that can be rotated in the vertical direction, and the other end is a spherical bearing that can be rotated and linearly moved. Current collector with a movable cover, characterized by the structure supported by 1.

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