JP2014034304A - Railway vehicle truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent abrasion powder from adhering to an oil seal and also prevent oil leakage from an axle box, by forcibly discharging the abrasion powder, which is generated by the abrasion of a slip-ring and a ground brush during running, outside the axle box, in a railway vehicle truck employing an oil bath lubricating bearing mounted with a grounding device in an axle end.SOLUTION: An abrasion powder discharging device 50 comprising a connecting pipe 54 connected to an axle box 30 provided with a grounding device 40 and a vent pipe 56 provided in a manner intersecting with the connecting pipe 54 is provided in the axle box 30. In the process that the running wind passes through the vent pipe 56, the pressure in the vent pipe 56 falls down, thereby generating an air flow such that the air inside the axle box 30 is discharged from the vent pipe 56 through the connecting pipe 54.

Description

  The present invention relates to a railcar bogie, and more particularly to a bogie equipped with a grounding device at the end of an axle and an oil bath lubricated bearing. The present invention relates to a railcar bogie equipped with a wear powder discharging device that can discharge outside a box.

  In a knitted vehicle formed by connecting a plurality of railway vehicles, a current collector or a pantograph (hereinafter referred to as a current collector) is raised and a rubbing plate constituting a current collector of the current collector is brought into contact with an overhead wire When the current collector is lowered and the rubbing plate is separated from the overhead line, or when the vacuum circuit breaker (VCB) provided in the circuit connecting the current collector and the main transformer is turned on and off, etc. A very large voltage is instantaneously generated, and a current (hereinafter referred to as a surge current) due to the large voltage may be generated.

  Although this surge current is generated for a short time, the surge current destroys the electrical equipment such as the main converter, auxiliary power supply, and air conditioner installed in the railway vehicle, or resets the electrical equipment. May cause it to occur. For this reason, in order to protect electrical equipment from surge current, the structure of the railway vehicle and the bogie are electrically connected, and the track is provided via the wheel shafts (having wheels at both ends of the axle). A grounding device for grounding is provided on the (line).

  Japanese Patent Application Laid-Open No. 2004-133620 discloses a technique for grounding a stray current that is generated in a railway vehicle, but not a surge current, to a track to suppress electric corrosion of a bearing of a wheel shaft. The technology is a pneumatic vehicle that operates in conjunction with a train, and the stray current flowing from the train into the body of the pneumatic vehicle is grounded to the track via a grounding device that connects the vehicle body and the carriage, an axle, and wheels. This suppresses the inflow of stray current to the axle bearing. With this configuration, it is possible to suppress the occurrence of electric corrosion on the axle bearing or the occurrence of electric discharge due to intermittent grounding in the axle bearing, which hinders the operation of the electric device.

Japanese Patent Laid-Open No. 11-310125

  The grounding device has an annular member provided on the axle and a grounding brush that slides on the annular member. Since the ground brush always contacts and slides on the annular member, friction powder is generated from the ground brush and the annular member due to friction and floats inside the bearing.

  In the vicinity of the grounding device, a bearing that rotatably supports a wheel shaft including a pair of wheels at both ends of the axle is provided. In general, the grounding device and the bearing are provided in a common axle box. When the bearing is an oil bath lubrication type bearing immersed in the lubricating oil staying in the shaft box, an annular oil seal is provided in the vicinity of the bearing so that the lubricating oil does not leak from the shaft box. The oil seal is brought into contact with the outer cylinder surface of the axle via an oil film, and slides with respect to the outer cylinder surface of the rotating axle to prevent the lubricating oil from leaking from the axle box.

When an oil bath lubricated bearing is equipped with a grounding device, the abrasion powder generated from the grounding device breaks the oil film formed between the oil seal and the outer cylinder surface of the axle, or wears the contact portion of the oil seal. It may cause the lubricant to leak out.
For this reason, there is a problem to be solved in terms of suppressing leakage of lubricating oil from the axle box when a grounding device is provided in addition to the oil bath lubricated bearing.

  An object of the present invention is to provide a railway vehicle carriage capable of suppressing leakage of lubricating oil from an axle box due to wear powder generated from the grounding apparatus in an oil bath lubrication type bearing provided with a grounding apparatus. It is.

  A railcar bogie of the present invention includes a wheel shaft, a shaft box that rotatably holds the wheel shaft, a grounding device provided in the shaft box, and an oil seal that holds lubricating oil inside the shaft box. The railway vehicle carriage includes a wear powder discharging device that discharges wear powder generated from the grounding device to the outside of the axle box.

  In addition, the grounding device includes a grounding brush that slides on an axle that forms the wheel shaft, and the wear powder discharging device includes a ventilation pipe through which traveling wind passes, a longitudinal center portion of the ventilation pipe, and the A connecting pipe connecting the axle box, and wear powder generated from the ground brush and the axle is discharged out of the axle box through the connecting pipe and the vent pipe. And

  Moreover, the railcar bogie of the present invention is characterized in that an opening through which air can flow into the inside of the axle box is provided in a lid that closes an end face of the axle box.

  Further, in the railway vehicle carriage according to the present invention, the ventilation pipe of the wear powder discharging device is opened back and forth in the traveling direction of the railway vehicle, and a central portion is provided with a throttle portion, and the traveling of the railway vehicle is performed. Due to the venturi effect of the throttle portion, the air in the axle box is sucked and the wear powder is discharged out of the axle box.

  Further, in the railway vehicle carriage according to the present invention, the inner diameter of both end portions in the longitudinal direction of the vent pipe is larger than the inner diameter of the central portion in the longitudinal direction of the vent pipe, and the one end portion of the vent pipe extends from the one end portion to the central portion. The inner diameter of the vent pipe is reduced, the inner diameter of the vent pipe is increased from the central portion toward the other end of the vent pipe, and the central portion of the vent pipe having the smaller inner diameter is The diaphragm portion is characterized in that

  The railcar bogie of the present invention is characterized in that the vent pipe is provided in a manner along the rail direction while intersecting the axial direction of the axle.

  In addition, the railway vehicle carriage according to the present invention is characterized in that a check valve that suppresses an air flow from the axle box toward the vent pipe is provided inside the connection pipe.

  According to the present invention, there is provided a railway vehicle carriage capable of suppressing leakage of lubricating oil from an axle box caused by wear powder generated from the grounding apparatus in a railway vehicle carriage provided with a grounding device on an oil bath lubrication type bearing. Can do.

[BRIEF DESCRIPTION OF THE DRAWINGS] It is a side view of the bogie for rail vehicles carrying the vehicle body which shows one Example of this invention. FIG. 2 is a cross-sectional view (A-A cross-sectional view of FIG. 1) of the axle box provided in the railway vehicle carriage. It is sectional drawing (BB sectional drawing of FIG. 2) of the abrasion powder discharge | emission apparatus with which an axle box is equipped same as the above.

  Hereinafter, preferred embodiments of the abrasion powder discharging apparatus according to the present invention will be described.

  FIG. 1 is a side view of a railway vehicle carriage equipped with a vehicle body. The vehicle body 10 of the railway vehicle is supported by a carriage 20 that can roll at both ends in the longitudinal direction. The carriage 20 includes a carriage frame composed of a pair of side beams 22 that are spaced apart in a manner along the rail direction, and a lateral beam (not shown) that connects the longitudinal center portions of the side beams 22, wheels 28, And an axle formed of an axle 29. The wheel shaft is provided with a pair of wheels 28 at both ends in the longitudinal direction of the axle 29, and is rotatable to a shaft box 30 connected via air springs 26 below both ends in the longitudinal direction of the side beam 22. Is held in.

  FIG. 2 is a cross-sectional view (cross-sectional view taken along line AA in FIG. 1) of the axle box 30 provided in the railcar carriage, and FIG. 3 is a cross-sectional view of the wear powder discharging device 50 provided in the axle box (B in FIG. 2). -B sectional view).

  The axle box 30 includes an axle box body 31 that includes a bearing 32 that rotatably holds the axle 29, a front lid 34 that is provided on the end of the axle box 31 in the longitudinal direction of the axle 29, and an axle box body 31. The rear cover 35 is provided on the center side in the longitudinal direction of the axle 29, and the cover 36 covers the opening of the front cover 34. The lid 36 is provided with an opening 37, and air can flow into the axle box 30 via the opening 37.

  An annular oil seal 38 that contacts the outer cylinder surface of the axle 29 is provided inside the front lid 34 and is connected to the vehicle body 10 (see FIG. 1) to guide a surge current or the like to the axle 29. And a wear powder discharging device 50 that discharges the wear powder generated from the grounding device 40 to the outside of the axle box 30. The rear lid 35 is provided with a labyrinth structure so that the lubricating oil in which the bearing 32 is immersed does not leak, but is provided with an oil seal 38 and a rear lid 35 provided on the front lid 34. The lubricating oil to be lubricated is prevented from leaking from the axle box 30.

  The grounding device 40 constitutes a circuit that electrically connects the vehicle body 10 (see FIG. 1) and the rail without passing through the bearing 32, and suppresses electric corrosion generated in the bearing 32 by including the grounding device 40. doing. The grounding device 40 includes a mounting seat 42 fixed to the front lid 34, and a grounding brush 44 that is provided on the mounting seat 42 and slides on the axle 29. A cable 60 extending from the ground terminal of the vehicle body 10 is connected to the mounting seat 42. The axle 29 on which the ground brush 44 slides is provided with an annular member 46 provided on the outer cylinder surface of the axle 29 as necessary.

  A wear powder discharging device 50 that discharges wear powder generated inside the axle box 30 to the outside of the axle box 30 is provided below the grounding device 40 in the front lid 34. The wear powder discharging device 50 includes a mounting seat 52 provided at a lower portion of the front lid 34, a connecting pipe 54 provided in a manner penetrating the mounting seat 52, and a mode crossing the longitudinal direction of the connecting pipe 54 and the axial direction of the axle 29. And a check valve 58 provided inside the connection pipe 54. Both ends in the longitudinal direction of the vent pipe 56 are open so that air can flow in and out.

  The ventilation pipe 56 is provided in the lower part of the axle box 30 in such a manner that its longitudinal direction is along the rail direction and intersects the axial direction of the axle 29, and the mounting seat 52 and the connecting pipe 54 are connected from the inside of the axle box 30. After that, it is configured to allow air to pass through.

  The inner diameter of both ends in the longitudinal direction of the vent pipe 56 is larger than the inner diameter of the central section in the longitudinal direction of the vent pipe 56, and the inner diameter gradually decreases from one end of the vent pipe 56 in the longitudinal direction to the central section. Thus, the inner diameter gradually increases from the longitudinal center of the vent pipe 56 to the other end. Thereby, the throttle part 57 is formed in the center part of the longitudinal direction of the ventilation pipe 56, and this throttle part 57 and the connection pipe 54 are connected.

  When the traveling wind 70 passes in the axial direction of the ventilation pipe 56 as the railway vehicle travels, the inner diameter of the throttle portion 57 at the center thereof is reduced, so that the air flow rate increases and the pressure decreases. When the pressure of the throttle part 57 of the ventilation pipe 56 is reduced, the pressure inside the axle box 30 connected to the throttle part 57 via the connection pipe 54 is also reduced. Thus, due to the venturi effect due to the pressure difference caused by the throttle portion 57, the pressure inside the axle box 30 decreases, and air flows into the axle box 30 from the opening 37 provided in the lid 36 that closes the front lid 34. Then, an air flow from the opening 37 to the ventilation pipe 56 through the axle box 30 and the connection pipe 54 is generated.

  Wear powder generated when the grounding brush 44 constituting the grounding device 40 slides on the annular member 46 due to the air flow passing through the shaft box 30 is transferred from the shaft box 30 via the wear powder discharging device 50 to the shaft. It is discharged out of the box 30. Since the wear powder is discharged to the outside of the axle box 30 without staying inside the axle box 30, the abrasion powder caught in the contact portion between the oil seal 38 and the axle 29 is reduced. It is possible to provide a railcar bogie that can suppress leakage of lubricating oil.

  A check valve 58 that closes the air flowing from the ventilation pipe 56 toward the axle box 30 is provided inside the connection pipe 54 that constitutes the abrasion powder discharging device 50, so that when a railway vehicle passes, Even if the running wind 70 is disturbed, the outside air is prevented from flowing from the wear powder discharging device 50 into the axle box 30. Further, the opening 37 provided in the lid 36 may be provided with a filter as necessary to prevent dust and the like contained in external air from flowing into the axle box 30.

DESCRIPTION OF SYMBOLS 10 ... Car body 20 ... Carriage 22 ... Side beam 26 ... Air spring 28 ... Wheel 29 ... Axle 30 ... Shaft box 31 ... Shaft box body 32 ... Bearing 34 ... Front lid 36 ... Lid 37 ... Opening 38 ... Oil seal 40 ... Ground Device 42 ... Mounting seat 44 ... Grounding brush 46 ... Annular member 50 ... Wear powder discharging device 52 ... Mounting seat 54 ... Connection pipe 56 ... Ventilation pipe 57 ... Throttle part 58 ... Check valve 60 ... Cable 70 ... Running wind

Claims (7)

The axle,
A shaft box for rotatably holding the wheel shaft;
A grounding device provided in the axle box;
In the bogie for railway vehicles having an oil seal for retaining lubricating oil inside the axle box,
A carriage for a railway vehicle comprising a wear powder discharging device for discharging wear powder generated from the grounding device to the outside of the axle box. In the bogie for railway vehicles according to claim 1,
The grounding device is
A grounding brush that slides on an axle that forms the wheel shaft;
The wear powder discharging device is:
A vent pipe through which the driving wind passes;
A connecting pipe that connects the central portion of the vent pipe in the longitudinal direction and the axle box;
Consists of
A railway vehicle carriage characterized in that abrasion powder generated from the grounding brush and the axle is discharged out of the axle box through the connection pipe and the vent pipe. In the bogie for railway vehicles according to claim 1,
A railcar bogie characterized in that an opening through which air can flow into the inside of the axle box is provided in a lid that closes an end face of the axle box. In the railcar bogie described in claim 2,
The vent pipe of the wear powder discharging device is opened back and forth in the traveling direction of the railway vehicle, and has a throttle portion at the center thereof, and when the railway vehicle travels, the venturi effect of the throttle portion causes the A carriage for a railway vehicle, wherein air in the axle box is sucked to discharge the wear powder to the outside of the axle box. In the railcar bogie described in claim 4,
The inner diameter of both ends in the longitudinal direction of the vent pipe is larger than the inner diameter of the central portion in the longitudinal direction of the vent pipe,
The inner diameter of the vent pipe decreases from one end of the vent pipe toward the center, and the inner diameter of the vent pipe increases from the center to the other end of the vent pipe. And
A railway vehicle carriage characterized in that the central portion of the small-diameter vent pipe is the throttle portion. In the railcar bogie described in claim 2,
The trolley for a railway vehicle characterized in that the vent pipe intersects with the axial direction of the axle and is provided in a manner along the rail direction. In the railcar bogie described in claim 2,
A railcar bogie characterized in that a check valve that suppresses an air flow from the axle box toward the vent pipe is provided inside the connecting pipe.

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