Rotation type current collector

Abstract

To provide a rotation type current collector which is applied to a power supply device of an electric vehicle, and which can minimize wear of an electrode pad by an increase in contact area of the pad and can reduce maintenance costs.SOLUTION: A rotation type current collector includes: a current collecting unit brought into contact with an overhead contact line; an electrode unit connected to a lower part of the current collecting unit; an upper gear unit fixed to a lower part of the electrode unit and including an upper gear; and a lower gear unit including a lower gear meshing with the upper gear. The upper gear and the lower gear mesh with each other to cause the current collecting unit to rotate in one direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a rotary current collector, and more particularly to a rotary current collector that is applied to a power supply device of an electric vehicle and minimizes wear of electrode pads to reduce maintenance costs. [Background technology]

[0002] The so-called third rail current collector for railway vehicles uses an additional rail to supply electricity along the track, and supplies mostly direct current, and is widely used in urban railways that are isolated from the outside environment.

[0003] In the past, the third-rail type current collector device had a fixed current collecting surface that contacted the track, which was prone to wear due to continuous friction on that surface alone, resulting in problems such as reduced durability, increased work time for replacement, and various increased costs.

[0004] In response to this, a technology has been developed in which two or more current collecting surfaces are selectively in contact in addition to one current collecting surface, as in Korean Patent No. 10-0381343, but this also has the problem of concentrated wear occurring on only some surfaces.

[0005] Furthermore, as shown in Figures 1a to 1d, a technology has been introduced in which the current collecting surface (A) is designed to rotate by 90 degrees around the center point (C) on the center line (C') of the current collecting shoe, thereby changing the friction surface with the electric wire (B) and allowing a relatively large number of surfaces to come into contact. However, this also poses the problem of friction being concentrated in only certain areas. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Korean Patent No. 10-0381343 Summary of the Invention [Problem to be solved by the invention]

[0007] The technical problem of the present invention is to address this issue, and an object of the present invention is to provide a rotary current collector that can be applied to a power supply device of an electric vehicle, and that can increase the contact area of ​​the pads to minimize wear on the electrode pads and reduce maintenance costs. [Means for solving the problem]

[0008] According to one embodiment of the present invention, a rotary current collecting device includes a current collecting unit that contacts an electric rail, an electrode unit that is connected to a lower portion of the current collecting unit, an upper gear unit that is fixed to a lower portion of the electrode unit and includes an upper gear, and a lower gear unit that includes a lower gear that meshes with the upper gear, and the current collecting unit rotates in one direction as the upper gear and the lower gear mesh with each other.

[0009] The car further includes a base unit that forms a storage space, and an internal unit that is stored in the storage space, and the upper gear and the lower gear extend circumferentially along a side surface of the internal unit.

[0010] The device further includes an elastic unit including a first elastic portion that applies an external force in an upward direction to the upper gear, and a second elastic portion that applies an external force in an upward direction to the lower gear.

[0011] The first elastic portion is fixed along the outer peripheral surface of the upper gear, and the second elastic portion is fixed along the outer peripheral surface of the lower gear, and each of the first and second elastic portions is a coil spring.

[0012] When the external force or vibration applied to the current collecting unit disappears, the first elastic portion moves the upper gear in an upward direction, and the second elastic portion moves the lower gear in an upward direction.

[0013] The lower gear unit further includes lower gear teeth formed on an upper portion of the lower gear and including an upper surface formed inclined in one direction, and the lower gear has an annular shape.

[0014] The upper gear unit further includes upper gear teeth formed on a lower portion of the upper gear and extending along an inclined direction of upper surfaces of the lower gear teeth.

[0015] When the upper gear and the lower gear mesh with each other, the upper gear teeth and the lower gear teeth are coupled along the inclined direction of the upper surface, and the upper gear unit rotates in only one direction.

[0016] The lower gear unit further includes a groove formed through the lower gear by a predetermined length along the inclination direction of the upper surface, and an inclined pin coupled to slide on the groove.

[0017] When the upper gear and the lower gear mesh with each other, the inclined pin slides in one direction on the groove, and the upper gear unit rotates in only one direction.

[0018] The current collecting unit is movable in the vertical direction when an external force or vibration is applied from the outside, and the upper gear meshes with the lower gear due to the movable position of the current collecting unit.

[0019] The electrode unit includes an electrode bar extending between the current collecting unit and the upper gear unit, and a rotating part coupled to the electrode bar along an outer circumferential surface thereof.

[0020] The rotating portion is a one-sided bearing that rotates the electrode rod in only one direction.

[0021] The electrode unit further includes a pitching pin coupled to the side of the electrode rod and extending to the side frame of the base unit, and as the position of the current collecting unit is variable, the position of the pitching pin is variable over an opening formed in the side frame. [Effects of the Invention]

[0022] According to the present invention, the problem of concentrated wear occurring only in one part of the current collecting surface of the conventional current collecting device is solved, and the current collecting device is designed to be rotatable at a predetermined angle, and a relatively wide current collecting surface is in contact, thereby minimizing wear problems and maintenance costs.

[0023] In particular, the rotary current collector is designed to rotate at a predetermined rotation angle when an external force or vibration is applied, and therefore, rotation is realized by itself due to various external forces and vibrations that occur during the operation of the electric vehicle. Therefore, the position of the current collector can be naturally changed during the operation without requiring a separate current collector surface replacement control.

[0024] That is, the gear teeth of the upper gear and the lower gear are designed to be inclined in one direction, and the grooves into which the inclined pins are coupled are also designed with the inclination direction of the gear teeth in mind. By designing the upper gear and the lower gear with consideration for the inclination direction, the upper gear and the lower gear can be coupled and rotated in only one direction when coupled to each other, and therefore the current collecting unit that rotates integrally with the upper gear can be controlled to rotate in only one direction.

[0025] In addition, the electrode unit extending between the current collecting unit and the upper gear not only serves to supply power, but is also connected to a rotating part made up of a single bearing that can rotate in only one direction, thereby preventing the current collecting unit from rotating in the reverse direction.

[0026] Thus, since the current collecting unit rotates only in one direction by a predetermined angle, the problem of continuous wear of only a specific current collecting surface due to simultaneous rotation in the opposite direction is minimized, and uniform wear is induced overall, thereby relatively improving durability. [Brief explanation of the drawings]

[0027] [Figure 1] 1a to 1d are schematic diagrams showing variable position states of the current collecting surface of a current collecting device according to the prior art. [Figure 2]FIG. 2 is a perspective view showing a rotary current collector according to one embodiment of the present invention. [Figure 3] FIG. 3 is a cross-sectional perspective view showing the rotary current collector of FIG. [Figure 4] FIG. 4 is a cross-sectional view of the rotary current collector of FIG. [Figure 5] 5a is a development view of the lower gear unit of FIG. 2, and FIG. 5b is a schematic view showing an operating state when an external force is applied to the lower gear unit of FIG. Specific details for implementing the invention

[0028] The present invention can be modified in various ways and can have various forms, and the embodiments will be described in detail herein. However, this is not intended to limit the present invention to the particular disclosed form, but it should be understood that the present invention includes all modifications, equivalents, and alternatives within the spirit and technical scope of the present invention. In the following description of the drawings, like reference numerals are used to refer to like elements. Terms such as "first," "second," etc. can be used to describe various elements, but the elements should not be limited by these terms.

[0029] The above terms are used only for the purpose of distinguishing one component from another. The terms used in this application are used merely to describe a particular embodiment and are not intended to limit the present invention. The singular expression also includes the plural expression unless otherwise clearly intended in the context.

[0030] In this application, the use of terms such as "comprises" or "consists of" should be understood as specifying the presence of any feature, number, step, operation, component, part, or combination thereof stated in the specification without precluding the presence or possibility of adding one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0031] Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms as defined in commonly used dictionaries should be interpreted to have a meaning consistent with the meaning they have in the context of the relevant art, and should not be interpreted as having an idealized or overly formal meaning unless expressly defined in this application.

[0032] Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings.

[0033] Fig. 2 is a perspective view showing a rotary current collector according to one embodiment of the present invention, Fig. 3 is a cross-sectional perspective view showing the rotary current collector of Fig. 2, and Fig. 4 is a cross-sectional view of the rotary current collector of Fig. 2.

[0034] As shown in FIGS. 2 to 4, the rotary current collector 10 according to this embodiment is mounted on an electric vehicle, receives power from electrode wires, and corresponds to a so-called third rail type current collector.

[0035] In addition, in an actual third-rail current collector, the pad portion 810 (described later) of the rotary current collector 10 is positioned toward the side and is configured to contact the electrode wires positioned at the side. However, for the sake of convenience, the drawings and the following description show the pad portion 810 positioned toward the top. However, the expressions "up / down" and "side" below are defined based on the state of the rotary current collector 10 shown in FIG. 2, and are not intended to limit the position to the corresponding direction even when the rotary current collector 10 is actually installed.

[0036] That is, the vertical direction means a direction toward the top and bottom based on Figures 3 and 4, and the lateral direction means a direction perpendicular to the vertical direction, that is, a direction toward both sides based on Figure 4.

[0037] Specifically, the rotary current collector 10 includes a base unit 100, an inner unit 200, an upper gear unit 300, a lower gear unit 400, an elastic unit 500, an electrode unit 600, a power connection unit 700, and a current collecting unit 800.

[0038] The base unit 100 includes a base frame 110 that forms the lower body of the rotary current collector 10 and forms the bottom surface, side frames 120 that extend upward from both ends of the base frame 110, a front frame 130 and a rear frame (not shown) that are connected to the base frame and the side frames and form the front and rear surfaces of the base unit 100, respectively, and an inclined frame 140 that extends upward at an angle from the side frame 120 and the front frame 130.

[0039] Here, the base unit 100 has a rectangular prism shape as a whole, or the base frame 110 has a rectangular frame structure, but is not limited to this, and the base unit 100 may have a cylindrical shape as a whole, or the base frame 110 may have a circular frame structure.

[0040] Meanwhile, in the case of the inclined frame 140, it is obvious that the degree of inclination and the direction of inclination can be variously designed and changed.

[0041] However, in the structure of the base unit 100 as shown in FIG. 2, openings 150 are formed at the upper ends of the side frames 120 corresponding to both side surfaces, and the ends of the pitching pins 630 described below are coupled through the openings 150.

[0042] The base unit 100 has a predetermined storage space 101 formed therein, and the storage space 101 stores the inner unit 200, the upper gear unit 300, the lower gear unit 400, and the elastic unit 500.

[0043] The internal unit 200 is housed inside the storage space 101 and is composed of a structure 210 having a predetermined volume. Here, the internal unit 200 is, for example, a cylindrical structure 210 and includes an upper surface portion 220 and a side surface portion 230.

[0044] That is, the side surface portion 230 is a cylindrical side surface, and can form an outer circumferential surface having a predetermined interval based on a center line passing through the structure 210 .

[0045] The lower gear unit 400 is formed along the side surface 230 and includes a lower gear 410 , lower gear teeth 420 , and an inclined pin 430 .

[0046] That is, the lower gear 410 is a frame structure that forms the main body of the lower gear unit 400, and is fixed along the side surface 230 of the inner unit 200. Here, since the side surface 230 of the inner unit 200 corresponds to the side surface of a cylinder and has a circular cross-sectional shape as a whole, the lower gear 410 may have a cylindrical frame structure having an annular shape as a whole along the side surface 230.

[0047] The lower gear teeth 420 are gear teeth formed on the upper surface of the lower gear 410, and are formed to have a predetermined inclined surface, as will be described later. In addition, the inclined pin 430 is a pin structure fixed on the body of the lower gear 410, extends from the inside of the inner unit 200 to the side part 230, and is coupled to the body of the lower gear 410.

[0048] Here, the specific structure and operation of the lower gear 410 will be described in detail with reference to the drawings below.

[0049] The upper gear unit 300 is located above the lower gear unit 400 and includes a circular frame 310 , an upper gear 320 , and upper gear teeth 330 .

[0050] The circular frame 310 has a circular plate structure with a predetermined thickness, and is disposed on the upper part of the inner unit 200 to form a predetermined separation space 301 with the inner unit 200. Here, the separation space 301 with the inner unit 200 can be variously designed.

[0051] The circular frame 310 has a cylindrical corner, and an upper gear 320 is formed downward along the cylindrical corner of the circular frame 310. Of course, the upper gear 320 can be formed integrally with the circular frame 310, and for the sake of convenience, they are defined as separate names.

[0052] The upper gear 320 is located above the lower gear 410, and just as the lower gear 410 has a circular frame structure that follows the circumference of the side portion 230 of the inner unit 200, the upper gear 320 also has a circular frame structure with the same diameter.

[0053] In addition, upper gear teeth 330 are formed on the lower surface of the upper gear 310, and the upper gear teeth 330 correspond to gear teeth that are gear-engaged with the lower gear teeth 420 formed on the upper surface of the lower gear 410.

[0054] Meanwhile, as described above, since the lower gear teeth 420 are formed to have a unidirectional inclination, the upper gear teeth 330 have a lower surface formed to have the same inclination as the inclination direction of the lower gear teeth 420 so as to be able to engage with the lower gear teeth 420. The state of engagement between the upper and lower gear teeth 330, 420 will be described later.

[0055] As described above, the upper gear 320 and the lower gear 410 are disposed to mesh with each other in the vertical direction along the side surface 230 of the inner unit 200. Here, the upper gear 320 and the lower gear 410 do not always maintain a state in which their gear teeth are engaged with each other, but are dynamically variable in state, such as being engaged with or disengaged from each other according to the operation of the current collecting unit 800.

[0056] The elastic unit 500 provides a predetermined elastic force to the upper gear 320 and the lower gear 410 and includes a first elastic portion 510 and a second elastic portion 520 .

[0057] The first elastic part 510 is fixed along the outer circumferential surface of the upper gear 320 , extends upward from the base frame 110 of the base unit 100 , and is fixed onto the upper gear 320 .

[0058] Here, the first elastic part 510 is, for example, a coil spring, which has a coil structure as a whole, and maintains a state of being fixed to the outer circumferential surface of the upper gear 320 .

[0059] Thus, the first elastic portion 510 provides a predetermined elastic force to the upper gear 320, and the elastic force thus provided provides a constant upward force to the upper gear 320. That is, the first elastic portion 510 provides a constant upward elastic force to the upper gear 320, i.e., the upper gear unit 300.

[0060] The second elastic part 520 is fixed on the lower gear 410 , extends upward from the base frame 110 of the base unit 100 , and is fixed on the lower gear 410 .

[0061] Here, the second elastic part 520 is also, for example, a coil spring, and has a coil structure as a whole, and maintains a fixed state to the lower gear 410 .

[0062] Thus, the second elastic portion 520 provides a predetermined elastic force to the lower gear 410, and the elastic force thus provided also provides a constant upward force to the lower gear 410. That is, the second elastic portion 520 provides a constant upward elastic force to the lower gear 410, i.e., the lower gear unit 400.

[0063] Meanwhile, a partition frame 530 is further formed to define the fixing positions of the first and second elastic parts 510 and 520. That is, the partition frame 530 has a cylinder frame structure as a whole as a frame structure sandwiched between the first and second elastic parts 510 and 520, and extends upward from the base frame 110. This minimizes interference between the first elastic part 510 and the second elastic part 520 and can provide elastic forces to the upper gear 320 and the lower gear 410, respectively.

[0064] The power collecting unit 800 is coupled to the top of the base unit 100 and is in direct contact with an electric wire (not shown) to receive power. The power collecting unit 800 includes a pad portion 810 and a coupling portion 820.

[0065] The pad portion 810 is a portion that comes into direct contact with the electric wire and includes a contact surface in the shape of a circular pad as shown in the drawing. Here, the size of the contact surface formed by the pad portion 810 is not limited, and the shape thereof may be circular, but may also be variably designed into various other shapes.

[0066] The coupling part 820 is a coupling unit that fixes the pad part 810, and includes upper and lower frames 821 and 822 and a first fastening part 823. The upper and lower frames 821 and 822 are coupled to the corners of the pad part 810, respectively, to fix the upper and lower corners of the pad part 810, thereby fixing the pad part 810.

[0067] In addition, the first fastening parts 810 are coupled in plurality along the upper and lower frames 821 and 822 to fix the pad part 810 between the upper and lower frames 821 and 822 .

[0068] That is, the pad part 810 needs to be replaced when it is sufficiently worn, but the pad part 810 can be replaced with the first fastening part 810 removed from the outside. Also, the pad part 810 is fixed to the upper and lower frames 821 and 822 by the first fastening part 810.

[0069] The electrode unit 600 provides the power transmitted through the pad portion 810 to the power connection unit 700, and includes an electrode rod 610, a rotating portion 620, a pitching pin 630, a rotating coupling portion 640, and a second fastening portion 650.

[0070] The electrode rod 610 has a column shape extending a predetermined length in the vertical direction, with its upper portion fixed to the pad portion 810 and its lower portion fixed to the circular frame 310. The electrode rod 610 includes a material with excellent electrical conductivity and serves as an electrode, providing power provided through the pad portion 810 to the power connection unit 700.

[0071] The rotating part 620 is coupled to the outer circumferential surface of the electrode rod 610, and the electrode rod 610 rotates inside the rotating part 620. Here, the rotating part 620 is a so-called one-sided bearing that allows rotation in only one direction and is restricted from rotation in the other direction.

[0072] Of course, the direction in which the rotating part 620 rotates is preset, and this can be set in consideration of the inclination direction of the upper surface of the lower gear 410, which will be described later.

[0073] Thus, the electrode rod 610 is restricted in its rotational direction by the rotating part 620 and can rotate in only one direction. Meanwhile, the electrode rod 610 is fixed at its upper and lower surfaces to the pad part 810 and the circular frame 310, and the electrode rod 610 rotates integrally with the current collecting unit 800 and the upper gear unit 300.

[0074] Therefore, the rotation direction of the current collecting unit 800 and the upper gear unit 300 is also restricted to only one direction by the rotating part 620 .

[0075] The pitching pins 630 extend in a pair from the side surfaces of the electrode rod 610 in the lateral direction, and the pitching pins 630 extend so that their ends 631 are positioned above the openings 150 of the side frames 120 described above.

[0076] Here, the rotary coupling portion 640 and the second fastening portion 650 fix the pitching pin 630, and as shown in the figure, the rotary coupling portion 640 is formed in a ring shape on the upper surface of the pitching pin 630, and the second fastening portion 650 fixes the rotary coupling portion 640 and the pitching pin 630 to each other.

[0077] Thus, the rotational coupling portion 640, the second fastening portion 650, and the pitching pin 630 are fastened together, and since the end 631 of the pitching pin 630 is positioned over the opening 150, it is not restricted in rotation with the electrode rod 610.

[0078] That is, the electrode rod 610 rotates integrally with the current collecting unit 800 and the upper gear unit 300, but the pitching pin 630 does not rotate integrally with them. However, when the electrode rod 610, the current collecting unit 800, and the upper gear unit 300 move vertically, the pitching pin 630 is constrained thereby and moves vertically at the same time, and the range of movement here is limited to the vertical length range of the opening 150.

[0079] That is, since the end 631 of the pitching pin 630 is positioned through the opening 150, the range of vertical movement of the end 631 of the pitching pin 630 is limited to the vertical length of the opening 150, and the vertical movement lengths of the electrode rod 610, the current collecting unit 800, and the upper gear unit 300 are similarly limited.

[0080] The power connection unit 700 is a terminal connected to the electrode unit 600 to supply power to the outside, and includes a connection portion 710 and an extension portion 720. The connection portion 710 is electrically connected to the electrode rod 610, and the extension portion 720 extends further in a lateral direction from the connection portion 710 and protrudes outside the base unit 100 (see FIG. 2).

[0081] Thus, the power collected by the power collection unit 800 is provided to the outside to supply necessary power.

[0082] Now, the operation of the rotary current collector 10 having the above structure will be described.

[0083] In an initial state, the pad unit 810 is in contact with the electric rail and receives power. However, various external forces and vibrations are transmitted to the pad unit 810 during operation of the electric vehicle. For example, external forces and vibrations may be transmitted to the pad unit 810 due to various reasons, such as changes in rail width or unevenness of the rail surface.

[0084] As described above, when an external force or vibration is transmitted to the pad portion 810, the pad portion 810 is integrally connected to the electrode rod 610 and the upper gear unit 300, and therefore the external force or vibration is transmitted to the electrode rod 610 and the upper gear unit 300. The transmitted external force or vibration induces a vertical displacement. Here, as described above, the vertical vibration of the electrode rod 610 is limited within a certain range due to the opening length of the opening 150 to which the end 631 of the pitching pin 630 is fixed. As a result, the vertical vibration is compensated for by the pitching pin 630.

[0085] However, when the electrode rod 610 moves up and down, the upper gear 320 of the upper gear unit 300 also moves up and down in the same manner, and as a result, the upper gear 320 and the lower gear 410 are coupled together by meshing their gear teeth with each other.

[0086] That is, in an initial state, the upper gear 320 is subjected to an upward force by the upward elastic force of the first elastic portion 510, and similarly, the lower gear 410 is subjected to an upward force by the upward elastic force of the second elastic portion 520. However, due to the difference in elastic force, the upper gear teeth 330 and the lower gear teeth 420 of the upper gear 320 and the lower gear 410 are not engaged with each other, and remain spaced apart by a predetermined distance in the vertical direction.

[0087] However, when the electrode rod 610 moves vertically due to an external force or vibration, and the upper gear 320 also moves vertically together with the electrode rod 610, if a downward external force greater than that of the first elastic part 510 is applied to the upper gear 320, the upper gear 320 comes into contact with and is coupled to the lower gear 410.

[0088] Here, the upper gear teeth 330 of the upper gear 320 and the lower gear teeth 420 of the lower gear 410 are engaged with each other, and during this engagement process, the upper gear teeth 330 rotate in one direction and rotate and engage with the lower gear teeth 420. Furthermore, the rotation direction of the upper gear teeth 330 is always maintained constant. That is, when the upper gear 320 descends to engage with the lower gear 410, the upper gear 320 always rotates in only one direction and engages with the lower gear 410.

[0089] Thus, the electrode rod 610 and the current collecting unit 800, which are integrally connected to the upper gear 320, rotate in one direction as the upper gear 320 rotates in one direction, and the contact portion of the pad portion 810 with the electric wire changes with the rotation.

[0090] Furthermore, even when the external force or vibration applied to the upper gear 320 disappears and the upper gear 320 further rises due to the elastic force of the first elastic part 510 to return to its initial state, the rotating part 620 coupled to the outer surface of the electrode rod 610 restricts the rotation direction so that it can rotate only in one direction, and therefore the electrode rod 610 does not rotate in the direction opposite to the one direction.

[0091] That is, the electrode rod 610 as well as the pad part 810 integrally coupled thereto only maintains the rotational state in one direction, and is restricted by the rotation part 620 from returning to the initial state.

[0092] Thus, the portion of the pad portion 810 that comes into contact with the trolley wire is variable by the rotation of the pad portion 810.

[0093] Furthermore, if an external force or vibration transmitted to the current collecting unit 800 occurs again, the pad part 810 rotates again in only one direction by the same mechanism as the rotation mechanism described above, and the contact part of the pad part 810 with the electric wire changes again.

[0094] As described above, when the upper gear 320 moves downward due to repeated external forces or vibrations and engages with the lower gear 410, the current collecting unit 800 rotates with the rotation of the upper gear 320 each time the gears are engaged, and the portion of the pad portion 810 that contacts the trolley wire changes accordingly.

[0095] Thus, more uniform contact can be induced across the entire surface area of ​​the pad portion 810, thereby minimizing replacement of the pad portion 810 due to concentrated wear on a specific area of ​​the pad portion 810 and improving the durability of the pad portion 810.

[0096] Meanwhile, a state in which the upper gear 320 rotates in only one direction while the upper gear 320 and the lower gear 410 are gear-coupled with each other will be described in detail.

[0097] 5a is a development view of the lower gear unit of FIG. 2, and FIG. 5b is a schematic view showing an operating state when an external force is applied to the lower gear unit of FIG.

[0098] 5a, the lower gear unit 400 includes the lower gear 410, the lower gear teeth 420, and an inclined pin 430. Here, a groove 431 in which the inclined pin 430 is positioned is formed on the lower gear 410.

[0099] As shown in the figure, the groove 431 is formed in an inclined direction, and the inclined pin 430 located inside the groove 431 is guided by the groove 431, and its position can be changed only in the inclined direction.

[0100] Also, as shown in the figure, the upper surface 421 of the lower gear teeth 420 is also formed to be inclined in one direction, and all the teeth are formed to have the same length and inclination angle.

[0101] In this state, when an external force (F) is applied as shown in FIG. 5b, the upper gear 320 moves downward in accordance with the direction of the external force (F), although this is not shown.

[0102] Accordingly, the upper gear teeth 330 also move downward due to the external force F and come into contact with the surface of the lower gear teeth 420. Furthermore, when the external force F is applied from above to below, the lower gear 410 as a whole moves downward as indicated by the arrow (here, the lower gear is supported by the second elastic portion 520 with a predetermined elastic force, but if the external force is greater than the elastic force, it moves downward). As the lower gear 410 moves, the inclined pin 430 moves onto the groove portion 431.

[0103] That is, the inclined pin 430 slides along the groove 431 from the lower side (FIG. 5a) to the upper side (FIG. 5b). Since the groove 431 is formed in an inclined direction, the lower gear 410 also naturally moves a certain distance along the inclined direction.

[0104] Here, if the inclination direction in which the groove portion 431 is formed is opposite to the inclination direction in which the lower gear teeth 420 are formed, the lower gear 410 can move partially in the direction indicated by the dotted arrow.

[0105] Meanwhile, the upper gear teeth 330 of the upper gear 320, which move downward due to the external force (F) and come into contact with and engage with the lower gear teeth 420, move in the direction indicated by the arrow according to the inclination direction of the lower gear teeth 420 and engage with the lower gear teeth 420.

[0106] That is, when the upper gear teeth 330 are engaged with the lower gear teeth 420, they naturally rotate in one direction indicated by an arrow (toward the left in FIG. 5b) and are engaged. Here, as described above, when the lower gear 410 moves downward due to an external force (F), the inclined pin 430 moves along the groove 431, so that the lower gear 410 moves a certain amount in the direction indicated by the dotted arrow (toward the right in FIG. 5b). Therefore, the upper gear teeth 330 are more naturally induced to rotate leftward and engage with the lower gear teeth 420.

[0107] As described above, when the upper gear teeth 330 are engaged with the lower gear teeth 420 by an external force, the lower gear 410 moves a certain amount to the right, and the upper gear teeth 330 always rotates in one direction due to the arrangement of the inclined tooth row of the lower gear teeth 420.

[0108] In particular, if the adjacent length (d) of the lower gear teeth 420 is maintained constant, the rotation stroke of the upper gear 320 in one direction is maintained constant during the process in which the upper gear teeth 330 engage with the lower gear teeth 420.

[0109] For example, if the lower gear teeth 420 are configured with a total of 15 teeth at regular intervals, the lower gear 410 is formed in an annular shape, and therefore, one tooth forms a rotation angle of about 24°.

[0110] Therefore, when the upper gear teeth 330 descend once and engage with the lower gear teeth 420, the upper gear 320 rotates at a constant rate of approximately 24° per descending movement, and the pad portion 810, which rotates integrally with the upper gear 320, also rotates at the same rate.

[0111] The number of teeth of the lower gear teeth 420 can be variably designed, and accordingly, the angle by which the pad part 810 rotates in one rotation can be variably designed.

[0112] Furthermore, as described above, even if the upper gear teeth 330 rise again due to the disappearance of the external force, the upper gear 320, once rotated, is restricted from returning to its original state by the rotating part 620, and the rotated state is maintained as it is.

[0113] According to the above-described embodiment of the present invention, the problem of concentrated wear occurring only in certain areas on the current collecting surface of the conventional current collector is solved, and the current collector is designed to be able to rotate constantly at a predetermined angle, and a relatively wide current collecting surface is in contact, thereby minimizing wear problems and maintenance costs.

[0114] In particular, the rotary current collector is designed to rotate at a predetermined rotation angle when an external force or vibration is applied, and therefore, rotation is realized by itself due to various external forces and vibrations that occur during the operation of the electric vehicle. Therefore, the position of the current collector can be naturally changed during the operation without requiring a separate current collector surface replacement control.

[0115] That is, the gear teeth of the upper gear and the lower gear are designed to be inclined in one direction, and the groove portion to which the inclined pin is coupled is also designed taking into consideration the inclination direction of the gear teeth. As a result, when the upper gear and the lower gear are coupled to each other, they can be rotated and coupled in only one direction, and thus the current collecting unit that rotates integrally with the upper gear can be controlled to rotate in only one direction.

[0116] In addition, the electrode unit extending between the current collecting unit and the upper gear not only serves to supply power, but is also coupled with a rotating part made up of a single bearing that can rotate in only one direction, thereby preventing the current collecting unit from rotating in the reverse direction.

[0117] Furthermore, since the current collecting unit rotates only in one direction by a predetermined angle, the problem of continuous wear on only a specific current collecting surface due to the rotation in the opposite direction being simultaneously performed can be minimized, and uniform wear can be induced as a whole, thereby relatively improving durability.

[0118] While the present invention has been described above with reference to preferred embodiments, those skilled in the art will appreciate that various modifications and variations can be made to the present invention without departing from the spirit and scope of the invention as set forth in the following claims. [Explanation of symbols]

[0119] 10: Rotating current collector 100: Base unit 200: Internal unit 300: Upper gear unit 310: Circular frame 320: Upper gear 330: Upper gear teeth 400: Lower gear unit 410: Lower gear 420: Lower gear teeth 430: Inclined pin 500: Elastic unit 510: First elastic part 520: Second elastic part 600: Electrode unit 610 : Electrode rod 620: Rotating part 630: Pitching pin 700: Power connection unit 800: Current collection unit 810: Pad section 820: Joint

Claims

1. a current collecting unit that is in contact with the electric wire; an electrode unit connected to a lower portion of the current collecting unit; an upper gear unit fixed to a lower portion of the electrode unit and including an upper gear; a lower gear unit including a lower gear meshing with the upper gear, The rotary current collector, characterized in that the upper gear and the lower gear are meshed with each other, so that the current collecting unit rotates in one direction.

2. a base unit that forms a storage space; an internal unit accommodated in the accommodation space; The rotary current collector according to claim 1 , wherein the upper gear and the lower gear extend circumferentially along a side surface of the inner unit.

3. 3. The rotary current collector according to claim 2, further comprising an elastic unit including a first elastic portion that applies an external force in an upward direction to the upper gear and a second elastic portion that applies an external force in an upward direction to the lower gear.

4. the first elastic portion is fixed along an outer circumferential surface of the upper gear, the second elastic portion is fixed along an outer circumferential surface of the lower gear, 4. The rotary current collector according to claim 3, wherein each of the first and second elastic portions is a coil spring.

5. The rotary current collector device described in claim 3, characterized in that when an external force or vibration applied to the current collecting unit disappears, the first elastic portion moves the upper gear in an upward direction, and the second elastic portion moves the lower gear in an upward direction.

6. the lower gear unit further includes lower gear teeth formed on an upper portion of the lower gear and including an upper surface formed inclined in one direction, The rotary current collector according to claim 1 , wherein the lower gear has an annular shape.

7. The rotary current collector according to claim 6 , wherein the upper gear unit further comprises upper gear teeth formed on a lower portion of the upper gear along an inclined direction of upper surfaces of the lower gear teeth.

8. 8. The rotary current collector according to claim 7, wherein when the upper gear and the lower gear mesh with each other, the upper gear teeth and the lower gear teeth are coupled along the inclination direction of the upper surface, and the upper gear unit rotates in only one direction.

9. The lower gear unit has a groove formed along a tilt direction of the upper surface and penetrating the lower gear by a predetermined length; 7. The rotary current collector according to claim 6, further comprising an inclined pin slidably coupled on the groove.

10. The rotary current collector according to claim 9, wherein when the upper gear and the lower gear mesh with each other, the inclined pin slides in one direction on the groove, and the upper gear unit rotates in only one direction.

11. The current collecting unit is movable in the vertical direction when an external force or vibration is applied from the outside, 2. The rotary current collector according to claim 1, wherein the upper gear meshes with the lower gear by varying the position of the current collecting unit.

12. The electrode unit includes an electrode rod extending between the current collecting unit and the upper gear unit; The rotary current collector according to claim 11, further comprising a rotating portion coupled along an outer circumferential surface of the electrode rod.

13. 13. The rotary current collector according to claim 12, wherein the rotating portion is a one-sided bearing that rotates the electrode rod in only one direction.

14. the electrode unit further includes a pitching pin coupled to a side of the electrode rod and extending to a side frame of the base unit; The rotary current collector according to claim 12, wherein the position of the current collecting unit is variable, so that the position of the pitching pin is variable on the opening formed in the side frame.

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