Method for suppressing unstable vibration of current collecting device

Abstract

To provide a method of suppressing unstable vibration of a current collecting device which can solve unstable vibration occurring in the current collecting device regardless of reduction of a friction coefficient of a slide surface between an overhead wire and the current collecting device.SOLUTION: A current collecting device includes: a lower frame whose base end side is attached through a main shaft rotatably in a pitching direction and has a main spring; an upper frame which is assembled to the lower frame rotatably in the pitching direction and includes, at the tip side, a collector head assembled rotatably in the pitching direction and including a contact strip capable of sliding on an overhead wire. A method for suppressing unstable vibration of the current collecting device includes: a decoupling step in which coupling of vibration in a vertical direction and vibration in a front-back direction of the current collecting device is decoupled; and a checking step in which whether or not the unstable vibration occurs is checked.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a method for suppressing unstable vibration of a current collector attached to the upper part of a railway vehicle.

Background Art

[0002] A railway vehicle has a current collector attached to the upper part of the vehicle, and the vehicle obtains power from an overhead line and runs by sliding the current collector on the overhead line.

[0003] Various forms of current collectors are known. For example, Patent Documents 1 and 2 propose methods for reducing the sliding friction between the current collector and the overhead line.

[0004] The current collector described in Patent Document 1 is a current collector that conducts electricity to the vehicle side while bringing a current collecting member into contact with an overhead line installed on a railway track, and the current collecting member is formed in a roll shape and configured to be rotatable.

[0005] The current collector configured in this way can reduce the sliding contact noise with the overhead line and improve the wear resistance.

[0006] In addition, the current collector described in Patent Document 2 has a wear plate made of a round bar-shaped conductor and is provided with bearings to support the conductor.

[0007] The current collector configured in this way has a wear plate that is a round bar-shaped conductor, and since the conductor rotates when in contact with the overhead line, the friction with the overhead line can be minimized.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0009] However, in the conventional current collector, since the sliding plate is configured as a rotating body, it is not a structure suitable for high-speed running, and there is a problem that the maintenance cost may increase.

[0010] Also, it is known that the current collector may generate unstable vibrations during the running of a railway vehicle. Since such unstable vibrations may lead to transportation failures such as train delays, it is necessary to eliminate them. In conventionally well-known methods, in order to reduce the friction coefficient of the sliding surface between the overhead line and the current collector, it is known to apply a substance containing a lubricating component to the overhead line or the sliding plate of the current collector, or to select a material with a low friction coefficient such as carbon for the sliding plate. However, from the viewpoint of ensuring a high level of safety with a highly tough material, it may be difficult to take such measures in some cases.

[0011] Regarding the generation mechanism of unstable vibrations, research on elucidating the mechanism has been advanced by the inventors, and it has been found that the coupling of the vertical vibration and the longitudinal vibration of the current collector is a factor in the generation of unstable vibrations.

[0012] Specifically, the simulation results will be described with reference to FIG. 10. In FIG. 10, the amplitude of the vibration is enlarged for better visibility. As shown in FIGS. 10(a) and (b), it can be confirmed that the sliding plate of the current collector is vibrating in a bending mode in the vertical direction (z direction). As shown in FIGS. 10(c) and (d), since the longitudinal positions (x direction) of the boat body of the current collector are different, the state of the longitudinal vibration of the frame (upper frame, lower frame, boat support link, counterweight bar) of the current collector can be confirmed. Also, the state of the pitching vibration of the boat body can be confirmed.

[0013] Thus, it is considered that the unstable vibration is generated by the coupling of the longitudinal vibration of the entire current collector device, the bending vibration of the sliding plate, or the pitching vibration of the boat body. However, since both the bending vibration of the sliding plate and the pitching vibration of the boat body involve vertical movement, in this specification, these vibrations are referred to as "vertical vibrations" for convenience.

[0014] Therefore, it was found that by designing the generation frequencies of the longitudinal vibration of the framework and the pitching vibration of the boat body or the bending vibration of the sliding plate to be different, it might be possible to avoid the coupling of the vertical vibration and the longitudinal vibration.

[0015] Therefore, the present invention has been made in view of the above problems and findings, and by eliminating the coupling of the vertical vibration and the longitudinal vibration generated in the current collector device, it is possible to eliminate the unstable vibration generated in the current collector device without reducing the friction coefficient of the sliding surface between the overhead line and the current collector device. An object of the present invention is to provide a method for suppressing unstable vibration of a current collector device.

Means for Solving the Problems

[0016] A method for suppressing unstable vibration of a current collector device according to the present invention includes a lower frame having a proximal end rotatably attached in a pitching direction via a main shaft and provided with a main spring, and an upper frame assembled to the lower frame so as to be rotatable in a pitching direction and having a boat body rotatably assembled to the distal end side in a pitching direction. The boat body is provided with a sliding plate slidable with an overhead line. A method for suppressing unstable vibration of a current collector device, comprising: a coupling elimination step of eliminating the coupling of the vertical vibration and the longitudinal vibration of the current collector device; and a confirmation step of confirming the presence or absence of the unstable vibration.

[0017] Further, in the method for suppressing unstable vibration of a current collector device according to the present invention, it is preferable that the coupling elimination step increases the support rigidity of the main shaft.

[0018] Further, in the method for suppressing unstable vibration of a current collector device according to the present invention, it is preferable that the coupling elimination step eliminates the play or looseness of the main shaft.

[0019] Also, in the method for suppressing unstable vibration of the current collector according to the present invention, it is preferable that the coupling elimination step increases the damping force of the main spring.

[0020] Also, in the method for suppressing unstable vibration of the current collector according to the present invention, it is preferable that the coupling elimination step increases or decreases the bending rigidity of the boat body.

[0021] Also, in the method for suppressing unstable vibration of the current collector according to the present invention, it is preferable that the coupling elimination step increases or decreases the pitching direction rigidity of the boat body.

[0022] Also, in the method for suppressing unstable vibration of the current collector according to the present invention, it is preferable that the coupling elimination step increases or decreases the pitching direction moment of inertia of the boat body.

[0023] Also, in the method for suppressing unstable vibration of the current collector according to the present invention, it is preferable that the coupling elimination step decreases the moment input with respect to the pitching direction of the boat body.

[0024] The above summary of the invention does not list all the necessary features of the present invention, and sub - combinations of these feature groups can also be inventions.

Effect of the Invention

[0025] The method for suppressing unstable vibration of the current collector according to the present invention includes a coupling elimination step of eliminating the coupling of the vertical vibration and the longitudinal vibration of the current collector, and a confirmation step of confirming the presence or absence of unstable vibration. Therefore, by the coupling elimination step of eliminating the coupling of the vertical vibration and the longitudinal vibration of the current collector, it is possible to provide a new method for eliminating unstable vibration that does not depend on changing the friction coefficient of the sliding surface between the overhead line and the current collector.

Brief Description of the Drawings

[0026]

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Figure 10

[0027] Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. Note that the following embodiments do not limit the invention according to each claim, and not all combinations of the features described in the embodiments are essential for the solution means of the invention.

[0028] [First Embodiment] FIG. 1 is a schematic diagram of a railway vehicle to which a method for suppressing unstable vibration of a current collector according to an embodiment of the present invention is applied, FIG. 2 is a perspective view for explaining the configuration of the current collector, FIG. 3 is a diagram for explaining the internal structure of the current collector, and FIG. 4 is a diagram for explaining a method for suppressing unstable vibration of a current collector according to a first embodiment of the present invention.

[0029] As shown in FIG. 1, the method for suppressing unstable vibration of the current collector according to the present embodiment is suitably used as a method for detecting an abnormality of the current collector 10 provided on the railway vehicle 1 traveling on the track 2. The railway vehicle 1 travels by being supplied with power when the current collector 10 installed on the roof of the railway vehicle body 3 is in sliding contact with the overhead line 4.

[0030] The current collector 10 includes a current collector main body 11 attached to the roof of the railway vehicle body 3, a frame body 12 extending from the current collector main body 11 toward the overhead line 4, and a boat body 14 attached to the tip of the frame body 12 and provided with a sliding plate 13 that is in sliding contact with the overhead line 4. Note that the railway vehicle 1 is formed by connecting a plurality of railway vehicle bodies 3 that do not include the above-described railway vehicle body 3 and current collector 10, and two or more current collectors 10 are provided in the entire railway vehicle 1.

[0031] As shown in FIGS. 2 and 3, the frame body 12 is a link mechanism that supports the boat body 14 so as to be relatively movable up and down with respect to the current collector main body 11, and the base end side is pivotally attached in the pitching direction via a main shaft 15. It includes a lower frame 12b and an upper frame 12a that is pivotally assembled to the lower frame 12b in the pitching direction.

[0032] The upper frame 12a has a boat body 14 pivotally assembled to the tip side in the pitching direction via a boat support 14a, and the base end side of the lower frame 12b is connected to the main shaft 15, and the boat body 14 is biased in the upward direction by a main spring 16. Further, it is preferable that a boat support link and a balance bar (not shown) are assembled in parallel to the upper frame 12a and the lower frame 12b, respectively.

[0033] The main shaft 15 is a member that moves the frame body 12 up and down, operates in conjunction with the frame body 12, and moves the frame body 12 up and down by rotating in the forward and reverse directions. The main shaft 15 is rotatably supported with respect to the current collector main body 11 and rotates integrally with the base end portion of the lower frame 12b.

[0034] The main spring 16 is a lifting spring that biases the main shaft 15 so that the main shaft 15 rotates and the frame body 12 rises. One end of the main spring 16 is rotatably connected to the base frame 17, and the other end of the main spring 16 is rotatably connected to a bracket portion (not shown) formed on the proximal end side of the lower frame 12b.

[0035] The boat body 14 includes a sliding plate 13 that slides on the overhead wire 4, a sliding plate body 18 to which the sliding plate 13 is attached, and a boat body main body 19 to which the sliding plate body 18 is attached. The boat body main body 19 is an elongated columnar member extending in a direction (the rocking direction) orthogonal to the overhead wire 4, and horn portions 19a are formed at both ends. The horn portion 19a is a member for preventing the intrusion of the railway vehicle 1 into the overhead wire 4 in a direction different from the traveling direction of the railway vehicle 1 among the two overhead wires 4 that intersect above the switch when the railway vehicle 1 passes through the switch. The horn portion 19a protrudes from both ends in the length direction of the boat body 14, and as shown in FIG. 2, the tip portion is curved downward.

[0036] The sliding plate 13 is a member that slides on the overhead wire 4. As shown in FIG. 2, the sliding plate 13 is a plate-shaped member made of metal or carbon that extends in a direction (the rocking direction) orthogonal to the traveling direction of the railway vehicle 1. The sliding plate 13 is a member manufactured separately from the boat body main body 19, and is attached to a sliding plate body 18 attached to the upper portion of the boat body main body 19 in a state where a plurality of them are arranged in the length direction (the rocking direction) of the boat body 14. The sliding plate 13 is supported by an elastic body such as a fine adjustment spring 21 so as to be relatively displaceable with respect to the sliding plate body 18.

[0037] Next, a method for suppressing unstable vibration of the current collector according to the present embodiment will be described. The method for suppressing unstable vibration of the current collector according to the present embodiment includes a coupling elimination step of eliminating the coupling of the vertical vibration and the longitudinal vibration of the current collector 10, and a confirmation step of confirming the presence or absence of unstable vibration with respect to the corresponding current collector 10 as a result of performing the coupling elimination step.

[0038] The coupling elimination step is a step for eliminating the coupling of the vertical vibration and the longitudinal vibration of the current collector device 10, which is a cause of the unstable vibration of the current collector device 10. Specifically, it is preferable to increase the support rigidity of the main shaft 15 at the base of the lower frame 12b of the current collector device 10.

[0039] More specifically, as shown in FIG. 4, the support rigidity can be increased by eliminating the play and backlash of the main shaft 15. It is preferable to replace the bearing 15a that rotatably supports the main shaft 15 with a bearing having a smaller internal clearance of the bearing.

[0040] The confirmation step is a step for confirming whether the unstable vibration generated in the current collector device 10 is suppressed after the above-described coupling elimination step. By this step, when the unstable vibration has been eliminated, the method for suppressing the unstable vibration of the current collector device 10 according to the present embodiment is terminated. Further, when the unstable vibration has not been eliminated, the coupling elimination step in the method for suppressing the unstable vibration of the current collector device 10 according to the second to sixth embodiments described later can be performed and the confirmation can be performed again.

[0041] Note that, as a result of performing a simulation on the method for suppressing the unstable vibration of the current collector device 10 according to the present embodiment described above, as the coupling elimination step, the stability of the current collector device obtained as a result of increasing the support rigidity of the main shaft 15 by 10 times is such that, within the range of the same contact position and the same friction coefficient where the support rigidity of the main shaft 15 before performing the coupling elimination step was measured, the unstable conditions disappeared and it was confirmed that the entire region was stabilized. Thereby, it is considered that "increasing the support rigidity of the main shaft at the base of the lower frame of the current collector device" is equivalent to "eliminating the play and backlash of the main shaft at the base of the lower frame of the current collector device" from the viewpoint of the support rigidity, and it was confirmed that the unstable vibration was eliminated by changing to a bearing that eliminates the play and backlash of the main shaft 15.

[0042] The method for suppressing the unstable vibration of the current collector device according to the first embodiment described above has been described for the case where the support rigidity of the main shaft 15 is increased as the coupling elimination step. Next, the second embodiment to be described will explain the coupling elimination step that performs a different response from the above-described first embodiment. Note that since the configuration of the current collector device 10 and the confirmation step are the same as those in the first embodiment, the same reference numerals are given and detailed description is omitted.

[0043] [Second Embodiment] FIG. 5 is a diagram for explaining a method for suppressing unstable vibration of a current collector device according to a second embodiment of the present invention.

[0044] The coupling elimination step in the method for suppressing the unstable vibration of the current collector device 10 according to the present embodiment has a configuration for increasing the damping force of the main spring 16. Specifically, as shown in FIG. 5, for example, a pantograph damper 20 arranged in parallel with the main spring 16 is applied with a large damping constant.

[0045] Regarding the method for suppressing the unstable vibration of the current collector device 10 according to the present embodiment described above, as a result of simulation, as the coupling elimination step, the stability of the current collector device 10 obtained by increasing the damping in the rotational direction of the main shaft 15 by 10 times is such that in the same contact position a and the same friction coefficient range where the support rigidity of the main shaft 15 before performing the coupling elimination step was measured, the unstable region decreases, and the value of the real part of the complex eigenvalue also becomes smaller, and it was confirmed that the stability is improved in the entire region.

[0046] The method for suppressing the unstable vibration of the current collector device according to the second embodiment described above has been described for the case where the damping force accompanying the rotation of the main shaft 15 is increased as the coupling elimination step. Next, the third embodiment to be described will explain the coupling elimination step that performs a different response from the above-described first and second embodiments. Note that since the configuration of the current collector device 10 and the confirmation step are the same as those in the first and second embodiments, the same reference numerals are given and detailed description is omitted.

[0047] [Third Embodiment] FIG. 6 is a diagram for explaining a method for suppressing unstable vibration of a current collector device according to a third embodiment of the present invention.

[0048] In the step of eliminating coupling in the method for suppressing unstable vibration of the current collector device 10 according to the present embodiment, the bending rigidity of the boat body 14 is increased or decreased. Specifically, as shown in FIG. 6, the plate thickness T1 of the sliding plate body 18 of the current collector device 10 is increased or decreased, or the support interval W of the sliding plate body 18 is increased or decreased. Thereby, by changing the balance between the vertical vibration and the longitudinal vibration, the coupling between the vertical vibration and the longitudinal vibration is eliminated. Regarding the specific dimensions of increase or decrease of the plate thickness T1 and the support interval W, it is preferable to perform individual and specific adjustment for each current collector device 10 for which unstable vibration is to be suppressed.

[0049] In addition, regarding the method for suppressing unstable vibration of the current collector device 10 according to the above-described present embodiment, as a result of performing a simulation, as the step of eliminating coupling, the stability of the current collector device 10 obtained as a result of reducing the bending rigidity of the sliding plate body 18 to 0.5 times is such that in the range of the same contact position a and the same friction coefficient where the support rigidity of the main shaft 15 before performing the step of eliminating coupling was measured, the unstable region decreases, and the value of the real part of the complex eigenvalue also becomes smaller, and it was confirmed that the stability is improved in the entire region.

[0050] The method for suppressing unstable vibration of the current collector device according to the third embodiment described above has been described for the case where the bending rigidity of the boat body 14 is increased or decreased as the step of eliminating coupling. The fourth embodiment to be described next will describe a step of eliminating coupling that performs a different response from the first to third embodiments described above. Regarding the configuration and confirmation step of the current collector device 10, since they are the same as those in the first to third embodiments, the same reference numerals are given and detailed description is omitted.

[0051] [Fourth Embodiment] FIG. 7 is a diagram for explaining a method for suppressing unstable vibration of a current collector device according to a fourth embodiment of the present invention.

[0052] In the decoupling process for suppressing the unstable vibration of the current collector device 10 according to the present embodiment, the pitching direction rigidity of the hull 14 is increased or decreased. Specifically, in addition to the method of flexibly supporting the slider plate 18, as shown in FIG. 7, a plurality of fine adjustment springs 21 for supporting the slider plate 18 are arranged (staggered) in the rail direction, and the rigidity of the bush around the pin 22 for rotatably connecting the slider plate 18 to the hull 14 can be increased or decreased.

[0053] Regarding the method for suppressing the unstable vibration of the current collector device 10 according to the above-described present embodiment, as a result of performing a simulation, as the decoupling process, when the pitching direction rigidity of the hull 14 is doubled, the contact force fluctuation result during running is that the contact force fluctuation becomes smaller and is stabilized as compared with the case where the pitching direction rigidity of the hull 14 is not changed. It was confirmed that even when the pitching direction rigidity is decreased, the unstable vibration is suppressed and stabilized because the generation frequency of the pitching vibration of the hull 14 changes due to the change in rigidity.

[0054] The method for suppressing the unstable vibration of the current collector device according to the fourth embodiment described above has been described for the case where the pitching direction rigidity of the hull 14 is increased or decreased as the decoupling process. Next, the fifth embodiment to be described will describe a decoupling process that performs a different response from the first to fourth embodiments described above. Note that the configuration and confirmation process of the current collector device 10 are the same as those of the first to fourth embodiments, and thus the same reference numerals are given and detailed description is omitted.

[0055] [Fifth Embodiment] FIG. 8 is a diagram for explaining a method for suppressing the unstable vibration of the current collector device according to the fifth embodiment of the present invention.

[0056] In the decoupling process for suppressing the unstable vibration of the current collector device 10 according to the present embodiment, the pitching direction moment of inertia of the hull 14 is increased or decreased. Specifically, as shown in FIG. 8, the plate thickness T2 and width L1 of the slider plate 13 are increased or decreased.

[0057] Regarding the method for suppressing unstable vibration of the current collector device 10 according to the above-described embodiment, as a result of performing a simulation, as a coupling elimination step, when the pitching-direction moment of inertia of the hull 14 is quadrupled, the contact force fluctuation result during running is that the contact force fluctuation becomes smaller and is stabilized as compared with the case where the pitching-direction rigidity of the hull 14 is not changed. Also, regarding the case of reducing the moment of inertia, since the generation frequency of the pitching vibration of the hull 14 changes due to the change in the moment of inertia, the unstable vibration is suppressed and stabilized.

[0058] The method for suppressing unstable vibration of the current collector device according to the fifth embodiment described above has been described for the case where the pitching-direction moment of inertia of the hull 14 is increased or decreased as a coupling elimination step. Next, the sixth embodiment to be described will explain a coupling elimination step that performs a different response from the first to fifth embodiments described above. Note that since the configuration and confirmation process of the current collector device 10 are the same as those in the first to fifth embodiments, the same reference numerals are given and detailed description is omitted.

[0059] [Sixth Embodiment] FIG. 9 is a diagram for explaining a method for suppressing unstable vibration of a current collector device according to the sixth embodiment of the present invention.

[0060] In the coupling elimination step in the method for suppressing unstable vibration of the current collector device 10 according to the present embodiment, the moment input with respect to the pitching direction of the hull 14 is reduced. Specifically, as shown in FIG. 9, it is preferably adopted to reduce the distance L2 between the fixed points of the upper frame coupling hole 23 and the balance link coupling hole 24 in the hull support 14a, and to shorten the vertical distance between the slider body 18 and the pin 22.

[0061] Regarding the method for suppressing unstable vibration of the current collector device 10 according to the above-described embodiment, as a result of performing a simulation, as a coupling elimination step, when the moment input with respect to the pitching direction of the hull 14 is reduced by 40%, the contact force fluctuation result during running is that the contact force fluctuation becomes smaller and is stabilized as compared with the case where the moment input with respect to the pitching direction of the hull 14 is not changed.

[0062] As described above, according to the method for suppressing unstable vibration of the current collector device according to the first to sixth embodiments, by the decoupling process, by changing the balance between the vertical vibration and the longitudinal vibration of the current collector device 10, the coupling between the vertical vibration and the longitudinal vibration can be eliminated. Therefore, it is possible to suppress the unstable vibration generated in the current collector device 10 without changing the friction coefficient of the sliding surface between the overhead wire and the current collector device 10.

[0063] Further, in the method for suppressing unstable vibration of the current collector device according to the first to sixth embodiments described above, as the decoupling process, specific examples have been described. However, the decoupling process may combine two or more of these specific examples, and the order of applying the specific examples is not necessarily in the order of the first to sixth embodiments. It can be appropriately adopted according to the frequency of the vertical vibration or the longitudinal vibration of the unstable vibration generated in the current collector device 10, or the degree of coupling between the vertical vibration and the longitudinal vibration. It is clear from the description of the claims that a form with such a change or improvement may also be included in the technical scope of the present invention.

Explanation of Reference Numerals

[0064] 1 Railway vehicle, 2 Track, 3 Railway vehicle body, 4 Overhead wire, 10 Current collector device, 11 Current collector device body, 12 Frame body, 12a Upper frame, 12b Lower frame, 13 Wear plate, 14 Boat body, 14a Boat support, 15 Main shaft, 15a Bearing, 16 Main spring, 17 Underframe, 18 Wear plate body, 19 Boat body main body, 19a Horn part, 20 Pantograph damper, 21 Fine adjustment spring, 22 Pin, 23 Upper frame coupling hole, 24 Balance link coupling hole.

Claims

1. A lower frame having a base end side rotatably attached in a pitching direction via a main shaft and provided with a main spring, and an upper frame rotatably assembled to the lower frame in a pitching direction and having a boat body rotatably assembled in a pitching direction at a tip end side, and the boat body is a method for suppressing unstable vibration of a current collector provided with a sliding plate slidable with a catenary wire, a coupling elimination step of eliminating the coupling of the vertical vibration and the longitudinal vibration of the current collector, and a confirmation step of confirming the presence or absence of the unstable vibration, characterized in that it comprises a method for suppressing unstable vibration of a current collector.

2. In the method for suppressing unstable vibration of a current collector according to claim 1, the coupling elimination step is characterized by increasing the support rigidity of the main shaft, a method for suppressing unstable vibration of a current collector.

3. In the method for suppressing unstable vibration of a current collector according to claim 1, the coupling elimination step is characterized by eliminating play or looseness of the main shaft, a method for suppressing unstable vibration of a current collector.

4. In the method for suppressing unstable vibration of a current collector according to claim 1, the coupling elimination step is characterized by increasing the damping force of the main spring, a method for suppressing unstable vibration of a current collector.

5. In the method for suppressing unstable vibration of a current collector according to claim 1, the coupling elimination step is characterized by increasing or decreasing the bending rigidity of the boat body, a method for suppressing unstable vibration of a current collector.

6. In the method for suppressing unstable vibration of a current collector according to claim 1, the coupling elimination step is characterized by increasing or decreasing the pitching direction rigidity of the boat body, a method for suppressing unstable vibration of a current collector.

7. In the method for suppressing unstable vibration of the current collector device according to claim 1, The coupling elimination step increases or decreases the pitching direction moment of inertia of the boat body, and is a method for suppressing unstable vibration of a current collector device.

8. In the method for suppressing unstable vibration of the current collector device according to claim 1, The coupling elimination step reduces the moment input with respect to the pitching direction of the boat body, and is a method for suppressing unstable vibration of a current collector device.

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