JP4434993B2 - Railway vehicle grounding device - Google Patents

Description

  The present invention relates to a railway vehicle grounding device.

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 conventional railway vehicle grounding device, the current is guided to the axle via the grounding brush and the slip ring without passing through the bearing, so that a large amount of current flows between the axle box and the axle. However, there is no risk of generating electric corrosion on the bearing.
Japanese Patent Laid-Open No. 11-245811

  However, in the conventional railway vehicle grounding device, since the grounding brush fixed to the axle box case 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 via the grounding brush and slip ring, but is led to the axle via the bearing and electric corrosion of the bearing occurs. Then there was a problem that it could not be used.

  The present invention has been made in view of the above circumstances, and even when the axle is moved in the axial direction with respect to the axle box, a grounding device for a railway vehicle capable of guiding current to the axle without passing through a bearing. It is an issue to provide.

In order to solve the above-mentioned problem, the invention according to claim 1 is provided at an end of an axle 4 supported by a bearing (flat bearing) 2 as shown in FIGS. A grounding device for a railway vehicle for preventing energization of 2,
A rotation-side jig 11 that is fixed to the end surface of the axle 4 and rotates with the axle 4, a stationary-side jig 12 on which the rotation-side jig 11 is rotatably mounted, and the rotation-side jig 11 An energizing portion interposed between the fixed side jig 12 and energized between the rotating side jig 11 and the fixed side jig 12 (conductive grease G in the case of FIG. 2, FIG. 4). And a rolling bearing 21) sealed with conductive grease G,
The current-carrying part is made of powder having conductive grease or conductive particles filled in a filling part 14 formed in the fixed-side jig 12, and an opening of the filling part 14 is formed on the fixed side. It is closed by a rotation side jig 11 rotatably mounted on a jig 12 via a rolling bearing 15;
A filling hole 16 for filling the filling portion conductive grease or powder having conductive particles is formed in the fixed side jig 12, and a plug 16a is removably inserted into the filling hole 16. It is characterized by that.

Here, the bearing supporting the axle may be a rolling bearing or a plain bearing.
Further, one end of a lead wire for passing current is connected to the fixed side jig, and the other end is connected to, for example, a bearing presser or the like that presses the bearing from the back side.
The conductive grease is a grease having conductivity obtained by mixing conductive particles such as carbon black with a lubricant.
Examples of the conductive particles include, but are not limited to, carbon black.
The powder having conductive particles means a powder containing 100% of conductive particles or a powder containing conductive particles and other particles.

  According to the first aspect of the present invention, 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 current-carrying part, and the rotation-side jig It will move together. And when the axle rotates, the rotation side jig rotates along with it, but since the current-carrying part is interposed between the rotation side jig and the fixed side jig, the fixed side is not passed through the bearing. The electric current can be guided to the axle through the jig, the energization unit, 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.

In addition , the filling portion of the fixed jig is filled with conductive grease or powder containing conductive particles, and the opening of the filling portion is closed by the rotation-side jig. The powder having grease or conductive particles can be reliably held, and the powder having conductive grease or conductive particles is securely in contact with both the fixed side jig and the rotary side jig and fixed. Energization between the side jig and the rotation side jig is ensured.
In addition, when the powder having conductive particles is fully filled (filled to the full without any gaps) in the filling portion of the fixed side jig, when the rotation side jig rotates, the conductive particles Compared with the conductive grease, it becomes difficult to form holes generated in the filling portion by rotation. Therefore, since the conductive particles reliably contact both the fixed side jig and the rotary side jig, the current flows through the fixed side jig, the conductive particles, and the rotary side jig without going through the bearing. Can be more reliably guided to the axle.

According to a second aspect of the present invention, in the grounding device for a railway vehicle according to the first aspect, the current-carrying portion is composed of conductive grease filled in a filling portion 14 formed in the fixed-side jig 12. The filling portion 14 is filled with a predetermined amount of the conductive grease in consideration of the expansion of the conductive grease when the axle 4 rotates without being filled with the conductive grease. Features.

The invention according to claim 3 is the grounding device for a railway vehicle according to claim 1 or 2 , as shown in FIGS.
The fixed side jig 12 is provided with anti-rotation members 18 and 18 that prevent the rotation side jig 11 from rotating with the rotation side jig 11. When fixed to the fixed side jig 12, it is cut off.

  Here, as the rotation preventing member, for example, a wire or the like can be used. Moreover, what is necessary is just to fix the other end part to the inner wall etc. of the axle box in which the bearing which supports an axle shaft is provided, for example, when the one end part of the rotation prevention member is fixed to the stationary jig.

According to the third aspect of the present invention, since the detent member is provided on the fixed side jig, even if the rotation side jig rotates together with the axle, the fixed side jig does not rotate accordingly. There is no going around.
In addition, when the rotation side jig is fixed to the fixed side jig due to the electrolytic corrosion of the bearing, etc., the fixed side jig rotates integrally with the rotation side jig. Since the lead wire connected to the fixed side jig is also cut, the function as a grounding device is lost, but when the fixed side jig and the rotating side jig rotate together, the rotation of the axle, that is, There will be no hindrance to the running of the vehicle.

According to the present invention, the rotation side jig fixed to the end surface of the axle and rotating together with the axle, the fixed side jig on which the rotation side jig is rotatably mounted, and the rotation side jig are fixed. The axle supported by the bearing is an axle box because it includes an energizing portion that is interposed between the side jig and enables energization between the rotating side jig and the fixed side jig. However, even if it moves to some extent in the axial direction, the fixed-side jig, the energizing portion, and the rotation-side jig move together. And when the axle rotates, the rotation side jig rotates along with it, but since the current-carrying part is interposed between the rotation side jig and the fixed side jig, the fixed side without passing through the bearing. The electric current can be guided to the axle through the jig, the energization unit, 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.
In addition, the filling portion of the fixed jig is filled with conductive grease or powder containing conductive particles, and the opening of the filling portion is closed by the rotation-side jig. The powder having grease or conductive particles can be reliably held, and the powder having conductive grease or conductive particles is securely in contact with both the fixed side jig and the rotary side jig and fixed. Energization between the side jig and the rotation side jig is ensured.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a sectional view of an axle box provided with a railway vehicle grounding device according to the present invention, FIG. 2 is a side sectional view showing the railway vehicle grounding device according to the present invention, and FIG. 3 is a front view thereof.

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 railway vehicle grounding device (hereinafter simply referred to as a grounding device) 10 according to the present application 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. 2 and 3, the grounding device 10 includes a rotation-side jig 11, a fixed-side jig 12, and a current-carrying part, and this current-carrying part is composed of conductive grease G. .
The rotation-side jig 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 integrated with the fixing plate 11a. It is comprised from the disk-shaped convex part 11b formed in this. The fixing plate 11 a is fixed to the end surface 4 b of the axle 4 by four bolts 13.

  Further, the fixed side jig 12 is mounted so that the rotary side jig 11 can be rotated, and is formed in a disc shape. A concave portion 14 is formed on one end face of the fixed side jig 12. A large-diameter portion 14a is formed in the opening of the concave portion 14, and a rolling bearing 15 is fitted into the large-diameter portion 14a. And the convex part 11b of the said rotation side jig | tool 11 is engage | inserted by this rolling bearing 15. FIG. Thereby, the rotation-side jig 11 is rotatably mounted on the fixed-side jig 12.

The concave portion 14 of the fixed side jig 12 is a filling portion 14 filled with conductive grease G. The opening portion of the filling portion 14 has a convex portion 11b of the rotary side jig 11 and the rolling bearing 15. It is blocked by
The filling portion 14 is filled with the conductive grease G from the filling hole 16 formed in the other end face of the fixed side jig 12. A plug 16a is removably inserted into the filling hole 16. The conductive grease G filled in the filling portion 14 is interposed between the rotation-side jig 11 and the fixed-side jig 12, and both the rotation-side jig 11 and the fixed-side jig 12 are interposed between them. In contact. That is, the conductive grease G is in contact with the end surface of the convex portion 11 b of the rotation side jig 11 and the inner wall surface forming the concave portion (filling portion) 14 of the stationary side jig 12. The filling portion 14 is not filled with the conductive grease G but is filled with a predetermined amount of the conductive grease G in consideration of the expansion of the conductive grease G when the axle 4 rotates.

Both the rotating side jig 11 and the fixed side jig 12 as described above are formed of a metal that can be energized, and one end of a lead wire 17 through which a current flows is electrically connected to the fixed side jig 12. It is connected. The other end of the lead wire 17 is electrically connected to the bearing presser 3 as shown in FIG.
The stationary jig 12 is provided with two rotation prevention members 18 and 18. The anti-rotation member 18 is for preventing rotation with the rotation side jig 11 and is formed of a wire or the like. One end portion of the rotation preventing member 18 is fixed to the outer peripheral portion of the stationary jig 12, and the other end portion is fixed to the inner wall of the axle box 1, although not shown.
Further, the anti-rotation members 18 and 18 have such tensile strength that they are cut when the rotation side jig 11 is fixed to the fixed side jig 12. That is, when the rotation side jig 11 is fixed to the fixed side jig 12 due to the electrolytic corrosion of the bearing, etc., the fixed side jig 12 rotates integrally with the rotation side jig 11. The members 18 and 18 have such tensile strength that they are cut by the rotational force of the fixed jig 12.

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 stationary jig 12, the conductive grease G, and the rotating jig 11 move together.
When the axle 4 rotates, the rotation-side jig 11 rotates accordingly. Since the conductive grease G is in contact with both the rotation-side jig 11 and the fixed-side jig 12, the current is leveled. Without passing through the bearing 2, it can be guided to the axle 4 via the stationary jig 12, the conductive grease G, and the rotating jig 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.

Moreover, since the opening part of the filling part 14 provided in the fixed side jig | tool 12 is obstruct | occluded by the rotation side jig | tool 11, the conductive grease G can be reliably hold | maintained at the filling part 14, and fixed side The conductive grease G can be reliably brought into contact with both the jig 12 and the rotation-side jig 11, so that the current can be more reliably guided to the axle 4 without going through the plain bearing 2.
Furthermore, since the locking members 18 are provided on the fixed jig 12, the fixed jig 12 does not rotate with the rotating jig 11. Further, when the rotation-side jig 11 is fixed to the fixed-side jig 12 due to the electrolytic corrosion of the bearing and the fixed-side jig 12 rotates integrally with the rotation-side jig 11, a detent member 18 and 18 are pulled and cut by the rotational force of the fixed-side jig 12, and the lead wire 17 connected to the fixed-side jig 12 is also cut. Since the tool 12 and the rotation-side jig 11 rotate integrally, the rotation of the axle 4, that is, the traveling of the vehicle is not hindered.
In the present embodiment, the filling portion 14 is filled with the conductive grease G, but instead of this, the conductive particles such as carbon black may be fully filled (fully filled with almost no gap). . If it does in this way, when the rotation side jig | tool 11 rotates, compared with electroconductive grease, it will become difficult to produce the void | hole which generate | occur | produces in the filling part 14 by rotation. Accordingly, since the conductive particles reliably contact both the fixed side jig 12 and the rotation side jig 11, the fixed side jig 12, the conductive particles, and the rotation side jig 11 do not pass through the bearing. The current can be more reliably guided to the axle via the.

Incidentally, the grounding device 1 0, since a bearing for supporting the axle 4 is a plain bearing 2, with the rotation of the axle 4, a certain degree (about 10 mm) in the axial direction the axle 4 relative to the axle box 1 moves It can be effectively applied to a freight car or the like.
It may also be changed Oite to the ground apparatus 1 0, a plain bearing 2 for supporting the axle 4 to the rolling bearing. In this case, the grounding device according to the present invention can be effectively applied to a railway vehicle equipped with rolling bearings.

It is sectional drawing of the axle box provided with the grounding apparatus of the railway vehicle which concerns on this invention. 1 is a side sectional view of a grounding device, showing an example of a grounding device for a railway vehicle according to the present invention. FIG.

Explanation of symbols

2 Plain bearing (bearing)
4 axles 1 0 grounding device 11 rotation-side jig 12 stationary jig 14 recess (filling portion)
17 Lead wire 18 Non-rotating member

Claims (3)

A grounding device for a railway vehicle, provided at an end of an axle supported by a bearing, for preventing energization of the bearing,
A rotation-side jig that is fixed to the end surface of the axle and rotates together with the axle, a fixed-side jig on which the rotation-side jig is rotatably mounted, and the rotation-side jig and the fixed-side jig. Including an energization part interposed between the rotation side jig and the fixed side jig to enable energization,
The energization part is composed of conductive grease or powder having conductive particles filled in a filling part formed on the fixed side jig, and an opening of the filling part is formed on the fixed side jig. It is closed by a rotation side jig that is rotatably mounted via a rolling bearing,
A filling hole for filling the filling portion conductive grease or powder having conductive particles is formed in the fixed-side jig, and a plug is removably inserted into the filling hole. Railway vehicle grounding device. The current-carrying part is composed of conductive grease filled in a filling part formed in the fixed-side jig, and the filling part is not filled with the conductive grease, and the axle is rotated during the rotation of the axle. The grounding device for a railway vehicle according to claim 1 , wherein a predetermined amount of the conductive grease is filled in consideration of expansion of the conductive grease . The fixed-side jig is provided with a rotation prevention member that prevents the rotation-side jig from rotating with the rotation-side jig. The rotation-stopping member is provided when the rotation-side jig is fixed to the fixed-side jig. , grounding device for railway vehicle according to claim 1 or 2, characterized in that it is cut.

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