Patent Application
20240227570
The present disclosure relates to a current collector for an electric railcar, and more specifically, to a current collector for an electric railcar for collecting power to a train and a power transmission device for transmitting power thereto.
The city transportation system is built on electric trains, subways, and monorail systems. The Trains, subways, and monorail systems are preferred public transportation means to solve urban traffic congestion and environmental problems. A current collector (power collector) is installed on the roof of an electric railcar such as an electric train, a subway train, or the like to collect power from a contact wire or trolley wire installed in the air. The current collector has been developed in various ways and structures, and pantographs are commonly used.
Korean Patent No. 10-0694309 entitled “Pantograph inspection device and method” and Korean Patent No. 10-0995910 entitled “Pantograph lifting control device” disclose the configuration of a pantograph for an electric railcar. The pantograph for electric railcars in these patent documents includes a lower frame, an upper frame as a movable mechanism, a collector shoe, an operating cylinder, and a spring. The collector shoe that directly contact the contact wire includes a main collector shoe, an auxiliary collector shoe, solid lubricant, a guide horn, etc. The main collector shoe is also called a sliding plate, a pantograph friction plate, and the like. The main collector shoe is made of copper and carbon, an iron-based sintered alloy, or an aluminum alloy.
Such a pantograph for electric railcars can collect power stably only when the collector shoe remains in constant contact with the contact wire even if the height of the contact wire changes depending on the structure of the line. In addition, it is very important to design and manufacture the pantograph so that the main collector shoe does not fall apart from the contact wire even when the electric railcar is running at high speed.
In the pantograph for electric railcars, the main collector shoe inevitably wears out due to constant friction with the contact wire, so it need to be inspected periodically and replaced with a new one. Since the main collector shoe is fixed to the upper frame by bolting, there is a disadvantage in that replacing the main collector shoe is cumbersome and time-consuming. In particular, the main collector shoe of the fixed type has a problem in that the lifespan is very short because the wear of the main collector shoe and the auxiliary collector shoe due to friction with the contact wire is large. In addition, there is a problem in that the wear prevention effect of the main collector shoe and the auxiliary collector shoe by the solid lubricant is insufficient. Moreover, the friction with the contact wire as described above has the problem of greatly reducing the efficiency of power transmission from the contact wire to the pantograph.
Accordingly, there is a need for a power collection structure for electric railcars that can prevent wear and improve power transmission efficiency.
The objective of one aspect of the present disclosure to solve the above-described problem is to provide a current collector for an electric railcar that introduces a roller structure to improve power transmission efficiency, a pantograph, and a rail structure and a power line structure for transmitting power to the devices.
A current collector for an electric railcar, in accordance with one aspect of the present disclosure, comprises: a current collecting member arranged on a circumference of a wheel for an electric railcar to collect power from a rail for the electric railcar; a base member coupled to the electric railcar; and a transmission member that transmits the power collected from the current collecting member to the base member, wherein the current collecting member makes rolling contact with the rail for the electric railcar by rolling of the wheel to minimize friction.
The current collecting member may be arranged entirely or partially in a width direction of the wheel for the electric railcar.
The current collecting member may have a width corresponding to the power transmission member on the rail for the electric railcar.
The current collecting member may include a convex protrusion or a concave depression in a portion corresponding to the corresponding width.
The transmission member may include: a rotation shaft of the wheel for the electric railcar (the rotation shaft being made of a conductive conductor); and an output line for receiving power from the rotation shaft and transmitting the received power to the base member.
The current collector may further comprise: a pair of brushes mounted on both sides in a width direction of the rotation shaft to conduct electricity from the current collecting member by contacting the current collecting member and the rotation shaft.
A rail device for transmitting power to an electric railcar, in accordance with another aspect of the present disclosure, comprises: a power transmission member for transmitting power to a current collecting member arranged on a wheel for the electric railcar, wherein the rail device is arranged on a rail for the electric railcar and makes rolling contact with the current collecting member to minimize friction.
The power transmission member may be arranged on a first rail for the electric railcar on which the electric railcar runs, or a second rail for the electric railcar disposed independently of the first rail.
The power transmission member may have a width corresponding to the current collecting member of the electric railcar.
The power transmission member may include a convex protrusion or a concave depression in a portion corresponding to the corresponding width.
A power line device for transmitting power to an electric railcar, in accordance with still another aspect of the present disclosure, comprises: a power transmission member for transmitting power to a pantograph provided with a movable mechanism mounted on a roof of the electric railcar, wherein the power transmission member receives power from a power line and transmits the received power to the pantograph, and the power transmission member is configured in a roller shape and makes rolling contact with the pantograph to minimize friction.
A power line device for transmitting power to an electric railcar, in accordance with another aspect of the present disclosure, comprises: a power line for transmitting power to a pantograph provided with a movable mechanism mounted on a roof of the electric railcar; and a power transmission support member disposed around the power line to support power transmission from the power line to the pantograph, wherein the power transmission support member is configured in a roller shape and makes rolling contact with the pantograph to minimize friction.
A pantograph provided with a movable mechanism mounted on a roof of an electric railcar, in accordance with still another aspect of the present disclosure, comprises: the movable mechanism; and a current collecting member, provided at an upper end of the movable mechanism, for collecting current in conjunction with a power transmission member for transmitting power from a power line to the pantograph, wherein the current collecting member has a roller shape corresponding to the power transmission member having a roller shape.
In the current collector for the electric railcar, the pantograph, and the rail structure and the power line structure for transmitting power to the devices according to the present disclosure, it is possible to prevent wear and tear, thereby improving reliability and minimizing power loss.
The present disclosure is subject to various modifications and may have many different embodiments, and specific embodiments are illustrated in the drawings and described in detail.
However, this is not intended to limit the present disclosure to the specific embodiments and is to be understood to include all modifications, equivalents or substitutions that are within the scope of the idea and technology of the present disclosure.
The terms such as first, second, etc. may be used to describe various components, but the components should not be limited by such terms. The terms are used only to distinguish one component from another. For example, without departing from the scope of the present disclosure, a first component may be named a second component, and similarly, the second component may be named the first component. The term “and/or” includes a combination of a plurality of related items or any of the plurality of related items.
When a component is said to be “coupled” or “connected” to another component, it should be understood that it may be directly coupled or connected to another component, but there may be other components between them. On the other hand, when a component is said to be “directly coupled” or “directly connected” to another component, it should be understood that there is no other component between them.
The terms used in the present specification are used to describe specific embodiments only and are not intended to limit the disclosure. The singular expression includes the plural unless the context clearly indicates otherwise. In the present specification, the terms “include” or “have” and the like are intended to designate the presence of the features, numbers, steps, actions, components, parts, or combinations thereof recited in the specification, and not to exclude the possibility of the presence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.
Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by those skilled in the art to which the present disclosure pertains. The terms, as defined in commonly used dictionaries, should be construed to have a meaning consistent with their contextual meaning in the relevant art and should not be construed to have an idealized or unduly formal meaning unless expressly defined in the present specification.
Hereinafter, preferred embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. In describing the present disclosure, identical components in the drawings will be designated by the same reference numerals for ease of overall understanding and redundant descriptions of the same components will be omitted.
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Meanwhile, a pair of brushes 413 is mounted on both sides of the rotation shaft 420. The brushes 413 are in contact with the rotation shaft 420 and the current collecting member 410, and conduct electricity from the current collecting member 410 to the rotation shaft 420. An output line (not shown) that outputs power from the rotation shaft 420 is connected to the rotation shaft 420. A pair of bearings 415 is mounted between the rotation shaft 420 and the current collecting member 410 to support the rotation of the current collecting member 410.
The current collecting member 410 for an electric railcar having such configurations collects power from the power transmitting member 452 while making rolling-sliding contact with the power transmitting member 452 of the rail. The power flows from the power transmission member 452 through the current collecting member 410, the brushes 413, the rotation shaft 420, and the output line (not shown) and is used for the operation of the electric railcar.
Meanwhile, the frictional resistance is greatly reduced by the rolling-sliding friction between the power transmission member 452 and the current collecting member 410, which prevents wear of the current collecting member 410 and the generation of noise and vibration, thereby increasing reliability. In particular, compared to uneven wear of the collector shoe of a conventional pantograph, uneven wear of the current collecting member 410 is prevented. By minimizing wear and friction, power loss is prevented, thereby maximizing power transmission efficiency.
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A rotation shaft 520 mounted on the base member is made of a conductive conductor. Both ends of the shaft 120 are rotatably supported on the base member by the bearings 515. The current collecting member 510 is mounted at a central portion of the rotation shaft 520 to rotate with the rotation shaft 520, and an axis hole into which the rotation shaft 520 is inserted and fixed is formed in the center of the current collecting member 510. The current collecting member 510 has an outer peripheral surface 511 that contacts a power transmission member 552 of a rail, which is formed on an outer surface thereof along its circumferential direction.
The pair of brushes 513 is mounted on both ends of the rotation shaft 520. The brushes 513 are disposed between both ends of the current collecting member 510 and the bearings 515. The brushes 513 and the bearings 515 are mounted on brackets (not shown) of the base member. The output lines 517 may be connected to the brushes 513 to output power.
In the current collecting member 510 having such configurations according to another embodiment, the outer peripheral surface 511 of the current collecting member 510 makes rolling-sliding contact with the power transmitting member 552 to collect power from the power transmitting member 552. The power flows from the power transmission member 552 through the current collecting member 510, the rotation shaft 520, the brushes 515, and the output line 517, and is used for the operation of the electric railcar.
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The power transmitted to the power transmission member 722 is supplied to the current collecting member 710 of the pantograph. The current collecting member 710 is flexibly supported by upper and lower frames 712 and transmits the power to a base member 714 to be used for the operation of the electric railcar. Meanwhile, the current collecting member 710 may be implemented in the form of a collector shoe. The collector shoe may be called a sliding plate or a pantograph friction plate, and may be made of copper and carbon, an iron-based sintered alloy, or an aluminum alloy material.
Although only the collector shoe form is shown in the embodiment of
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Meanwhile, the current collecting member 815 has the same or similar structure as the current collecting member on the wheel for an electric railcar according to one embodiment of the present disclosure in
In another example, the shape of the current collecting member 815 may be formed to correspond to the shape of the power transmission support member 822.
Although the description has been made with reference to the drawings and the embodiments, this does not mean that the protection scope of the present disclosure is limited by the drawings or the embodiments, and it will be understood by those skilled in the art that various modifications and changes may be made to the present disclosure without departing from the idea and scope of the present disclosure as set forth in the following claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2021-0059992 | May 2021 | KR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2022/006582 | 5/9/2022 | WO |
