JP5105886B2 - Energizing rotating device for grounding device of railway vehicle - Google Patents

Description

  The present invention relates to an energizing rotation device applied to, for example, a grounding device for a railway vehicle and other devices.

For example, in an electric railway vehicle using a traveling rail as a return line, a current is passed to the traveling rail via an axle and wheels via a grounding device provided on the carriage. However, in some cases, a current may flow through the bearing, which may cause electrolytic corrosion on the rolling surface of the bearing and the rolling member.
An example of a technique for solving this is described in Patent Document 1. In this railway vehicle, the inner race of the bearing is fixed to the axle by the axle box front cover that covers the axle end, and a through hole is formed in the axle box front lid, and a slip ring is formed outside the axle box front lid. Are attached so that their leg portions are inserted into the through-holes and in contact with the end face of the axle, and a grounding brush is slidably contacted with the outer end face of the slip ring.
According to such a grounding device for a railway vehicle, since the current is guided to the axle through the grounding brush and the slip ring without passing through the bearing, the bearing is supported even if a large amount of current flows between the axle box and the axle. There is no risk of generating electric corrosion.

  However, in the conventional railway vehicle grounding device, the grounding brush fixed to the casing of the axle box is in sliding contact with the outer end surface of the slip ring. For example, the axle is supported by a plain bearing. In addition, if the axle moves to some extent (about 10 mm) in the axial direction, the slip ring also moves relative to the axle box along with the movement of the axle, and as a result, the grounding brush may move away from the slip ring. In this case, the current is not led to the axle through the grounding brush and slip ring, but is led to the axle through the bearing and the electric corrosion of the bearing occurs. Then there was a problem that it could not be used.

A grounding device that solves this problem is described in Patent Document 2. The grounding device is a grounding device for a railway vehicle that is provided at an end portion of an axle supported by a bearing (a plain bearing) and prevents energization of the bearing, and is fixed to an end surface of the axle. A rotation-side jig that rotates together with the axle, a fixed-side jig on which the rotation-side jig is rotatably mounted, and the rotation-side jig interposed between the rotation-side jig and the fixed-side jig. A fluid-like or powder-like conductive medium that enables energization between the side jig and the fixed-side jig is provided.
According to such a grounding device, even if the axle supported by the bearing moves to some extent in the axial direction with respect to the axle box, the fixed-side jig, the conductive medium, and the rotation-side jig are integrated. Will move. Then, when the axle rotates, the rotation side jig rotates with it, but since the conductive medium is interposed between the rotation side jig and the fixed side jig, it is fixed without going through the bearing. The electric current can be guided to the axle through the side jig, the conductive medium, and the rotation side jig. That is, even when the axle moves in the axial direction with respect to the axle box, the current can be guided to the axle without going through the bearing.
Japanese Patent Laid-Open No. 11-245811 JP 2005-289356 A

  However, in the grounding device as described above, since the conductive medium is composed of conductive grease or powder having conductive particles, etc., the rotating side jig and the rotating side jig are electrically conductive as the rotating side jig rotates. The temperature of the conductive medium rises due to friction with the conductive medium. When the temperature of the conductive medium rises, the contact surface where the conductive medium comes into contact with the rotation-side jig and the fixed-side jig is oxidized, and this oxidation increases the electrical resistance value of the contact surface. It becomes difficult to do. Such a phenomenon occurs not only in a railway vehicle grounding device but also in a device that needs to ensure electrical conductivity while supporting a rotating object such as a bearing.

The present invention has been made in view of the above circumstances, and provides an energization rotating device for a grounding device of a railway vehicle capable of reliably energizing without increasing an electric resistance value even when the temperature of a conductive medium rises. It is an issue.

In order to solve the above problems, a first aspect of the present invention, for example as shown in FIGS. 1 and 2, mounted on an axle 4 which is rotatably supported by a bearing 2, rotates together with the axle 4 The rotating member 11, the fixing member 12 on which the rotating member 11 is rotatably mounted, and a gap between the rotating member 11 and the fixing member 12 are enclosed between the rotating member 11 and the fixing member 12. In an energizing rotating device for a grounding device of a railway vehicle, including a fluid or powdery conductive medium G1 capable of energizing the
Antioxidant coatings 20 and 21 having conductivity are formed on the contact surface of the rotating member 11 and the contact surface of the fixing member 12 that are in contact with the conductive medium G1.

  Here, the antioxidant coating can be formed by various coating forming techniques. For example, the antioxidant coating may be formed by chemical conversion treatment, vapor deposition, or the like in addition to the shot peening described later.

  According to the first aspect of the present invention, since the anti-oxidation coating having conductivity is formed on the contact surface of the rotating member that contacts the conductive medium and the contact surface of the fixing member, the rotating member rotates. Even if the temperature of the conductive medium rises, the contact surface can be prevented from being oxidized. Therefore, even if the temperature of the conductive medium rises, it can be reliably energized without increasing the electrical resistance value.

According to a second aspect of the present invention, in the energizing rotating device for a railway vehicle grounding device according to the first aspect, the antioxidant coating is a carbon coating 20, 21 or a soft material such as gold, silver, copper, or tin. It is a metal film.

  According to the invention described in claim 2, since the antioxidant coating is a carbon coating or a soft metal coating such as gold, silver, copper, tin, etc., the coefficient of friction of the antioxidant coating can be lowered. Therefore, the temperature rise of the conductive medium due to the rotation of the rotating member can be suppressed, and oxidation of the contact surface can be more effectively prevented.

According to a third aspect of the present invention, in the energizing rotating device for a grounding device of a railway vehicle according to the first aspect, the anti-oxidation coatings 20 and 21 are attached by projecting carbon powder onto the contact surface by shot peening. It is characterized by being formed.

  According to the invention described in claim 3, since the antioxidant coating is formed by projecting and adhering carbon powder to the contact surface by shot peening, the antioxidant coating can be easily formed according to the shape of the contact surface. And can be formed uniformly.

According to a fourth aspect of the present invention, in the energizing rotating device for a grounding device for a railway vehicle according to the first aspect, the surface of the antioxidant coatings 20 and 21 is roughened by projecting shot particles by shot peening. The contact surface is formed by projecting and adhering carbon powder by shot peening.

  According to the invention described in claim 4, the carbon powder is reliably and firmly attached to the contact surface by projecting and attaching the carbon powder to the contact surface having a rough surface by shot peening. Therefore, the durability of the antioxidant coating is improved.

According to a fifth aspect of the present invention, in the energization rotating device for a grounding device of a railway vehicle according to the first aspect,
The rotating member 31 includes a disk-shaped fixing plate 31a fixed to the end surface of the axle 4, and a convex portion 31c formed on the fixing plate 31a, and a concave portion 38 is formed on the front end surface of the convex portion 31c. And
The fixing member 32 is formed in a disc shape, a concave portion 37 is formed on an end surface thereof, a convex portion 32a is formed on a bottom surface of the concave portion 37, and the convex portion 32a is formed on the fixing plate 31a. Inserted into the recess 38 with a predetermined gap,
When the tip of the convex portion 31 c formed on the fixing plate 31 a is in close contact with the inner wall surface of the concave portion 37 formed on the end surface of the fixing member 32, both the concave portions 37 and 38 are closed. The concave portions 37 and 38 form a gap between the rotating member 31 and the fixed member 32, and the conductive medium is sealed in the gap .

According to the fifth aspect of the present invention, the conductive antioxidant film is formed on the contact surface of the fixing member that contacts the conductive medium and the contact surface of the rotating member. Even if the temperature of the conductive medium rises, the contact surface can be prevented from being oxidized. Therefore, even if the temperature of the conductive medium rises, it can be reliably energized without increasing the electrical resistance value.

According to the present invention, the rotating member that rotates together with the axle , the fixing member on which the rotating member is rotatably mounted, and the gap between the rotating member and the fixing member are enclosed. An electrically conductive antioxidation coating is formed on the contact surface of the rotating member and the contact surface of the fixing member that are in contact with the conductive medium. Therefore, even if the temperature of the conductive medium rises due to the rotation of the rotating member, the contact surface can be prevented from being oxidized. Therefore, even if the temperature of the conductive medium rises, it can be reliably energized without increasing the electrical resistance value.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
The present embodiment is an example in which the energizing rotating device according to the present invention is applied to a grounding device for a railway vehicle.
FIG. 1 is a sectional view of an axle box provided with a railway vehicle grounding device, and FIG. 2 is a side sectional view showing the railway vehicle grounding device.

In FIG. 1, reference numeral 1 denotes a shaft box. The axle box 1 is attached to a bogie of a railway vehicle (not shown), and a plain bearing 2 is provided in the axle box 1. A bearing presser 3 is provided on the back side of the plain bearing 2, and the plain bearing 2 is supported from the back side by the bearing presser 3. The plain bearing 2 has a circular arc plate shape, and its inner peripheral surface is in sliding contact with the journal portion 4 a of the axle 4, whereby the axle 4 is rotatably supported by the plain bearing 2.
The lubricating oil J is stored in the lower part of the axle box 1, and the oil filler 5 is provided with the lower part immersed in the lubricating oil J. The upper portion of the oil filler 5 is in sliding contact with the journal portion 4a of the axle 4, so that the lubricating oil J is supplied to the journal portion 4a. When the axle 4 rotates, an oil film is formed at the sliding contact portion between the journal portion 4a and the flat bearing 2.

  A grounding device (hereinafter simply referred to as a grounding device) 10 for a railway vehicle as an energizing rotating device according to the present invention is provided in the axle box 1. The grounding device 10 is a device that is provided at an end of the axle 4 supported by the plain bearing 2 and energizes the axle 4 without going through the plain bearing 2. Hereinafter, the grounding device 10 will be described in detail.

That is, as shown in FIGS. 1 and 2, the grounding device 10 includes a rotating member 11, a fixing member 12, and a conductive medium G1, and the conductive medium G1 has conductive grease and conductive particles. It is comprised by the granule etc. The conductive grease is a grease having conductivity obtained by mixing conductive particles such as carbon black in lubricating grease or lubricating oil.
The rotating member 11 is fixed to the end surface 4b of the axle 4 and rotates together with the axle 4. The disk-shaped fixing plate 11a fixed to the end surface 4b and the fixing plate 11a are integrally formed. It is comprised from the disk-shaped convex part 11b made. The fixing plate 11 a is fixed to the end surface 4 b of the axle 4 by four bolts 13.

The fixing member 12 is a member on which the rotating member 11 is rotatably mounted, and is formed in a disc shape. A ring member 14 is fixed to one end face of the fixing member 12 by a bolt 15, and a rolling bearing 16 is fixed inside the ring member 14. And the convex part 11b of the said rotation member 11 is engage | inserted by this rolling bearing 16. FIG. As a result, the rotating member 11 is rotatably mounted on the fixed member 12.
A circular recess 17 is formed on one end surface of the fixing member 12, and the opening of the recess 17 is closed by the protrusion 11 b of the rotating member 11 and the rolling bearing 16. Therefore, a predetermined gap is provided between the rotating member 11 and the fixing member 12 by the concave portion 17, and a filling (not shown) formed on the other end surface of the fixing member 12 in the gap (concave portion 17). The conductive medium G1 is filled and sealed from the hole. The conductive medium G <b> 1 filled in the concave portion 17 is interposed between the rotating member 11 and the fixed member 12, and is in contact with both the rotating member 11 and the fixed member 12. That is, the conductive medium G <b> 1 is in contact with the end surface of the convex portion 11 b of the rotating member 11 and the inner wall surface that forms the concave portion 17 of the fixing member 12. The recess 17 is not filled with the conductive medium G1, but is filled with a predetermined amount of the conductive medium G1 in consideration of expansion of the conductive medium G1 when the axle 4 rotates.

The rolling bearing 16 is a shield-type rolling bearing, in which a conductive medium G1 is sealed, and the outer ring and the inner ring of the rolling bearing 16 are electrically connected by the conductive medium G1. Thus, the rotary member 11, by attaching the fixing member 12 conductive medium G1 via a rolling bearing 16 which is sealed, the fixed member 12, the outer ring of the rolling bearing 16 in which the conductive medium G1 is sealed Are in contact with each other, and the inner ring of the rolling bearing 16 is in contact with the rotating member 11. This also enables energization between the rotating member 11 and the fixed member 12.

Both the rotating member 11 and the fixing member 12 as described above are made of a metal that can be energized, and one end of a lead wire 18 that allows current to flow is electrically connected to the fixing member 12. The other end of the lead wire 18 is electrically connected to the axle box 1 as shown in FIG.
Further, conductive antioxidant coatings 20 and 21 are formed on the contact surface of the rotating member 11 and the contact surface of the fixing member 12 that are in contact with the conductive medium G1. That is, the antioxidant coating 20 is formed on the inner wall surface of the concave portion 17 of the fixing member 12, and the antioxidant coating 21 is formed on the end surface of the convex portion 11 b of the rotating member 11.

The antioxidant coatings 20 and 21 are carbon coatings having a thickness of about several μm and are formed as follows.
That is, the inner wall surface of the concave portion 17 of the fixing member 12 is shot by shot peening with shot particles made of alumina particles that are fine hard particles to roughen the inner wall surface, and carbon powder is applied to the rough inner wall surface. It is formed by projecting and attaching by shot peening. The surface roughness of the carbon coating is about 3 to 4 μm in terms of Rz (10-point average height).
Similarly, shot particles made of alumina particles, which are fine hard particles, are projected onto the end surface of the convex portion 11b of the rotating member 11 by shot peening to roughen the end surface, and carbon powder is applied to the roughened end surface. It is formed by projecting and attaching by shot peening. The surface roughness of the carbon coating is about 3 to 4 μm in terms of Rz (10-point average height).
Such antioxidant coatings (carbon coatings) 20 and 21 have a low coefficient of friction, and specifically, the coefficient of friction is 0.3 or less.

The fixing member 12 is provided with a non-rotating member (not shown) for preventing rotation with the rotating member 11. The anti-rotation member is formed of a wire or the like, one end is fixed to the outer peripheral portion of the fixing member 12, and the other end is fixed to the inner wall of the axle box.
Further, the anti-rotation member has such a tensile strength that it is cut when the rotating member 11 is fixed to the fixed member 12. That is, when the rotating member 11 is fixed to the fixing member 12 due to electric corrosion or the like of the bearing, the fixing member 12 rotates integrally with the rotating member 11. At this time, the rotation preventing member acts as a rotational force of the fixing member 12 . It has a tensile strength that can be cut by

In the grounding device 10 configured as described above, even when the axle 4 supported by the plain bearing 2 moves to some extent in the axial direction with respect to the axle box 1 when the railway vehicle travels, The fixed member 12, the conductive medium G1, and the rotating member 11 are moved together.
Then, when the axle 4 rotates, the rotating member 11 rotates accordingly. However, since the conductive medium G1 is in contact with both the rotating member 11 and the fixed member 12, the current passes through the plain bearing 2. And can be guided to the axle 4 through the fixing member 12, the conductive medium G <b> 1, and the rotating member 11. That is, even when the axle 4 moves in the axial direction with respect to the axle box 1, current can be guided to the axle 4 without going through the plain bearing 2.

Then, the contact surface of the rotating member 12 that contacts the conductive medium G1 (the inner wall surface of the concave portion 17 of the fixing member 12) and the contact surface of the rotating member 11 (the end surface of the convex portion 11b of the rotating member 11) are made conductive. Since the anti-oxidation coatings 20 and 21 are formed, even if the temperature of the conductive medium G1 rises due to the rotation of the rotating member 11, the contact surface can be prevented from being oxidized. Therefore, even if the temperature of the conductive medium G1 rises, it can be reliably energized without increasing the electrical resistance value.
Moreover, since the antioxidant coatings 20 and 21 are formed by projecting and adhering carbon powder to the contact surface by shot peening, the antioxidant coatings 20 and 21 can be easily and uniformly formed according to the shape of the contact surface. Can be formed.
Furthermore, since the carbon powder can be reliably and firmly attached to the contact surface by projecting and attaching the carbon powder to the contact surface having a rough surface by shot peening, the antioxidant coating 20, The durability of 21 is improved.
In addition, since the antioxidant coatings 20 and 21 are coatings having a low coefficient of friction (0.3 or less), the temperature rise of the conductive medium G1 due to the rotation of the rotating member 11 can be suppressed, and the contact surface is oxidized. It can be prevented more effectively.

In this embodiment, the concave portion 17 is filled with fluid conductive grease as the conductive medium G1, but instead of this, conductive powder particles such as carbon black may be filled almost without gaps. Good. If it does in this way, when the rotation member 11 rotates, the electroconductive particle will become difficult to produce the void | hole which generate | occur | produces in the recessed part 17 by rotation compared with electroconductive grease. Therefore, since the conductive particles reliably come into contact with both the fixed member 12 and the rotating member 11, without passing through the bearing, the fixed particles 12, the conductive particles (conductive medium), and the rotating member 11 are used. Current can be more reliably guided to the axle. Also at this time, conductive antioxidant coatings 20 and 21 are formed on the contact surface of the fixing member 12 and the contact surface of the rotating member 11 that are in contact with the powdered conductive particles (conductive medium). Therefore, even if the temperature of the conductive medium rises due to the rotation of the rotating member 11, the contact surface can be prevented from being oxidized. Therefore, even if the temperature of the conductive medium rises, it can be reliably energized without increasing the electrical resistance value.

(Second embodiment)
This embodiment is also an example in which the energizing rotating device according to the present invention is applied to a grounding device for a railway vehicle.
FIG. 3 is a side sectional view showing a grounding device for a railway vehicle.
As shown in FIG. 3, the grounding device 30 includes a rotating member 31, a fixing member 32, and a conductive medium G2, and the conductive medium G2 is composed of powdered conductive particles. For example, carbon powder is used as the conductive particles.
The rotating member 31 is fixed to the end surface 4b of the axle 4 and rotates together with the axle 4. The disk-shaped fixing plate 31a fixed to the end surface 4b and the fixing plate 31a are integrally formed. Disk-shaped convex portions 31b and 31c. The fixed plate 31 a is fixed to the end surface 4 b of the axle 4 by the four bolts 13. Further, the convex portion 31b and the convex portion 31c are formed coaxially, and the convex portion 31c has a smaller diameter.

The fixing member 32 is a member on which the rotating member 31 is rotatably mounted, and is formed in a disk shape. Ring members 34 and 35 are fixed to one end face of the fixing member 32, and a rolling bearing 36 is fixed inside the ring member 35. Then, the convex portion 31b of the rotary member 31 is fitted into the rolling bearing 36, further by the projecting portion 31c of the rotary member 31 to the inside of the ring member 34 is loosely fitted, the fixing member 32, A rotating member 31 is rotatably mounted.
A circular concave portion 37 is formed on one end surface of the fixing member 32, and a convex portion 32 a is projected from the bottom surface of the concave portion 37.
On the other hand, the convex portion 31c protrudes from the ring member 34, and a concave portion 38 is formed on the tip surface thereof. The inner diameter of the concave portion 38 is formed larger than the diameter of the convex portion 32a, and the convex portion 32a is inserted into the concave portion 38 with a predetermined gap. Further, the tip of the convex portion 31 c is in close contact with the inclined inner wall surface of the concave portion 37, thereby closing the concave portion 37 and the concave portion 38.

A predetermined gap is provided between the rotating member 31 and the fixing member 32 by the concave portion 37 and the concave portion 38, and the other end surface of the fixing member 32 is formed in the gap (the concave portions 37 and 38). The conductive medium G2 is filled and sealed from the formed filling hole (not shown). The conductive medium G <b> 2 filled in the recesses 37 and 38 is interposed between the rotating member 31 and the fixed member 32, and is in contact with both the rotating member 31 and the fixed member 32. That is, the conductive medium G2 is in contact with the inner wall surface of the concave portion 38 of the convex portion 31c of the rotating member 31, the inner wall surface of the concave portion 37 of the fixing member 32, and the outer peripheral surface of the convex portion 32a. The gap (recesses 37 and 38) is filled with the conductive medium G2 with almost no gap.

Both the rotating member 31 and the fixing member 32 as described above are formed of a metal that can be energized, and one end portion of the lead wire 18 through which a current flows is electrically connected to the fixing member 32. The other end of the lead wire 18 is electrically connected to the axle box 1.
Further, conductive antioxidant coatings 40 and 41 are formed on the contact surface of the rotating member 31 and the contact surface of the fixing member 32 that are in contact with the conductive medium G2. That is, the antioxidant coating 40 is formed on the inner wall surface of the concave portion 37 and the outer peripheral surface of the convex portion 32 a of the fixing member 32 , and the antioxidant coating 41 is formed on the tip surface of the rotating member 31 and the inner wall surface of the concave portion 38. .

The antioxidant coatings 40 and 41 are carbon coatings having a thickness of about several μm, and are formed in the same manner as the antioxidant coatings 20 and 21.
That is, the inner wall surface and the outer peripheral surface are roughened by projecting shot particles made of alumina particles, which are fine hard particles, onto the inner wall surface of the concave portion 37 of the fixing member 32 and the outer peripheral surface of the convex portion 32a by shot peening. It is formed by projecting and adhering carbon powder to the roughened inner wall surface and outer peripheral surface by shot peening. The surface roughness of the carbon coating is about 3 to 4 μm in terms of Rz (10-point average height).
Similarly, the tip surface and the inner wall surface are roughened by projecting shot particles made of alumina particles, which are fine hard particles, onto the tip surface of the rotating member 31 and the inner wall surface of the recess 38 by shot peening. It is formed by projecting and adhering carbon powder to the front end surface and inner wall surface by shot peening. The surface roughness of the carbon coating is about 3 to 4 μm in terms of Rz (10-point average height).
Such an antioxidant coating (carbon coating) 40, 41 has a low coefficient of friction, and specifically, the coefficient of friction is 0.3 or less.

In the grounding device 30 configured as described above, like the grounding device 10, the conductive antioxidant film 40 is formed on the contact surface of the fixing member 32 that contacts the conductive medium G <b> 2 and the contact surface of the rotating member 31. , 41 are formed, the oxidation of the contact surface can be prevented even when the temperature of the conductive medium G2 rises due to the rotation of the rotating member 31. Therefore, even if the temperature of the conductive medium G2 rises, it can be reliably energized without increasing the electrical resistance value.
Further, since the antioxidant coatings 40 and 41 are formed by projecting and adhering carbon powder to the contact surface by shot peening, the antioxidant coatings 40 and 41 can be easily and uniformly formed according to the shape of the contact surface. Can be formed.
Furthermore, since the carbon powder can be reliably and firmly attached to the contact surface by projecting and attaching the carbon powder to the contact surface having a rough surface by shot peening, the antioxidant coating 40, The durability of 41 is improved.
In addition, since the antioxidant coatings 40 and 41 are coatings having a low friction coefficient (0.3 or less), the temperature rise of the conductive medium G2 due to the rotation of the rotating member 31 can be suppressed, and the contact surface is oxidized. It can be prevented more effectively.

  In this embodiment, the concave portions 37 and 38 are filled with powdered conductive particles as the conductive medium G2, but instead of this, fluid conductive grease may be filled. In this case, it is preferable not to fill the recesses 37 and 38 with conductive grease but to fill and enclose a predetermined amount of conductive grease in consideration of expansion of the conductive grease when the axle 4 rotates.

(Experimental example)
Using the grounding device 30 on which the antioxidant coatings 40 and 41 are formed and the grounding device on which the antioxidant coating is not formed, the electrical resistance value with respect to the total number of revolutions of the axle was examined by experiments.
In the experimental example, the antioxidant coatings 40 and 41 made of a carbon coating having a friction coefficient of 0.3 or less and a thickness of about several μm are formed, and 0.3 g of powdery carbon powder is used as the conductive medium G2. used. In the experimental example, 20 A was energized.
In the comparative example, the antioxidant coating was not formed, and 0.3 g of powdery carbon powder was used as the conductive medium G2. In the comparative example, 20 A was energized.

表１およびグラフから明らかなように、実験例に係る接地装置は、比較例に係る接地装置に比して、電気抵抗値が低く、また、総回転数の増加に伴う電気抵抗値の増加量も少ないことが判明した。 The results are shown in Table 1 and the graph shown in FIG.

As is clear from Table 1 and the graph, the grounding device according to the experimental example has a lower electrical resistance value than the grounding device according to the comparative example, and the amount of increase in the electrical resistance value accompanying the increase in the total number of revolutions. It turned out to be less.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an axle box including a grounding device, showing a first example in which an energizing rotating device according to the present invention is applied to a grounding device for a railway vehicle. It is a sectional side view showing a grounding device. FIG. 2 is a side sectional view showing a grounding device according to a second example in which the energizing rotating device according to the present invention is applied to a grounding device for a railway vehicle. It is a graph which shows the result of an experiment example and a comparative example.

Explanation of symbols

2 Bearing 3 Rotating shaft 10,30 Grounding device (electric rotating device)
11, 31 Rotating member 12, 32 Fixed member 20, 40 Antioxidation coating 21, 41 Antioxidation coating G1, G2 Conductive medium

Claims (5)

It mounted on rotatably supported axle bearing, sealed in a gap between a rotating member that rotates together with the axle, and a fixed member which the rotating member is rotatably mounted, and the rotating member and the fixed member In the energizing rotating device for a grounding device of a railway vehicle , comprising a fluid-like or powder-like conductive medium capable of energizing between the rotating member and the fixed member,
An energizing rotating device for a grounding device of a railway vehicle , wherein a conductive antioxidant coating is formed on a contact surface of the rotating member that contacts the conductive medium and a contact surface of the fixing member. The energization rotating device for a grounding device of a railway vehicle according to claim 1, wherein the antioxidant coating is a carbon coating or a soft metal coating such as gold, silver, copper, tin, or the like. The energization rotating device for a grounding device of a railway vehicle according to claim 1, wherein the antioxidant coating is formed by projecting and adhering carbon powder to the contact surface by shot peening. The anti-oxidation coating is formed by projecting and adhering carbon powder by shot peening to a contact surface roughened by projecting shot particles by shot peening. The energizing rotation device for a railway vehicle grounding device according to claim 1. The rotating member includes a disk-shaped fixing plate fixed to an end surface of the axle, and a convex portion formed on the fixing plate, and a concave portion is formed on a tip surface of the convex portion,
  The fixing member is formed in a disc shape, a concave portion is formed on an end surface thereof, a convex portion is formed on a bottom surface of the concave portion, and the convex portion is provided with a predetermined gap in the concave portion of the convex portion formed on the fixing plate. Inserted with
  The two concave portions are closed by the tip of the convex portion formed on the fixing plate being in close contact with the inner wall surface of the concave portion formed on the end surface of the fixing member, and the two concave portions are fixed to the rotating member. The energization rotating device for a grounding device of a railway vehicle according to claim 1, wherein a gap is formed between the member and the conductive medium.

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