JPH0718024U - Grounding device for bearings of railroad vehicle axles - Google Patents

Abstract

(57) [Abstract] [Purpose] A grounding device that has a simple structure, saves space and costs, and is easy to maintain. A grounding device housing 1 that penetrates the front lid 8 that is attached to the axle box 2 so as to cover the axle end of the axle 3
1 is set. A brush accommodating hole 13 is provided in the grounding device housing 11 to accommodate the grounding brush 14, the stopper 16 and the spring member 15. The ground brush 14 is the spring member 1.
5, the tip is pressed against the conductive plate 5 on the shaft end surface of the axle 3. A partition plate 18 is provided on the inner periphery of the peripheral wall of the front lid 8 to prevent grease or the like from entering the contact portion of the ground brush 14 with the conductive plate 5 from the bearing 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a grounding device for a bearing for a railroad vehicle axle that prevents electrolytic corrosion of the bearing.

[0002]

[Problems to be solved by conventional techniques and devices]

 BACKGROUND ART Conventionally, in rolling bearings used in railway vehicles, a grounding device that electrically connects the axle box and the shaft has been used in order to eliminate the potential difference between the bearing ring and the rolling elements. As a result, electric current flows from the shaft to the wheels, from the wheels to the rails, and from the rails to the ground, preventing electrolytic corrosion of the bearing races and rolling elements.

However, each of the conventional grounding devices of this type has a problem that the structure is complicated and expensive, and a large space is required. Even if there is no problem in space, there may be a problem of wear due to sliding contact of the ground brush.

FIG. 2 shows an example of a conventional grounding device (Japanese Patent Laid-Open No. 58-47652). In this example, the rotating front lid 52 fixed to the axle 51 is provided with a ring 57 made of a conductive wear-resistant material, and the ground brush 53 slidably contacting the ring 57 is used as a non-rotating mounting member on the truck 54 side. 55. The ground brush 53 is biased by a spring member 56 so as to project. With this configuration, a relatively small grounding space is required, and the ring 57 made of a wear-resistant material prevents the front lid 52 from wearing.

However, since the structure is such that the ring 57 on the outer diameter surface of the front cover 52 is brought into sliding contact with the ground brush 53, the sliding contact is made at a high speed portion with a high peripheral speed. Therefore, the ground brush 53 and the ring 57 are likely to be worn, and maintenance for replacing the ground brush 53 and the ring 57 is troublesome.

An object of the present invention is to provide a grounding device for a bearing for a railroad vehicle axle, which has a simple structure, saves space and costs, and is easy to maintain.

[0007]

[Means for Solving the Problems]

 In the grounding device for a bearing for a railroad vehicle axle according to the present invention, a front cover that covers the shaft end of the axle and is attached to the axle box is provided with a grounding device housing that penetrates the front cover. A brush accommodating hole penetrating in the axial direction is provided in the grounding device housing, and a grounding brush, a stopper, and a spring member are provided in the hole. The grounding brush has its tip in contact with the conductive plate on the end face of the axle. The spring member is interposed between the stopper and the ground brush to bias the ground brush in a protruding manner.

[0008]

[Action]

 With this configuration, the potential difference generated around the bearing causes the current to escape from the shaft box to the shaft, wheels, and rails via the grounding brush in this grounding device. Therefore, there is no potential difference between the bearing ring and the rolling elements, and electrolytic corrosion of the bearing ring and rolling elements is prevented. Since the ground brush is in sliding contact with the conductive plate on the shaft end surface, the sliding contact speed is slower than that in sliding contact with the outer diameter portion of the shaft, and wear of the ground brush and the conductive plate is reduced. In addition, this grounding device has a brush accommodating hole in the grounding device housing that penetrates through the front lid, and accommodates the grounding brush and the spring member in it, so the installation space is small and it is not necessary for the grounding device housing. It can be handled as an integrated part with all parts incorporated. Therefore, maintenance can be performed easily.

[0009]

【Example】

 An embodiment of this invention will be described with reference to FIG. The axle bearing 1 comprises a cylindrical roller bearing with a guide collar, etc., and is installed in an axle box 2 made up of a bogie or the like to support the axle 3 near the shaft end. A ring-shaped nut 4 is screwed onto the male screw portion 3a at the shaft end of the axle 3, and a conductive plate 5 covering the shaft end surface is attached to a small-diameter screw hole in front of the ring-shaped nut 4 by a bolt 7 via a current-carrying spacer 6. It is stopped by. The energizing spacer 6 is partially fitted in a groove provided in the male screw portion 3a of the axle 3. The front lid 8 is a lid that covers the shaft end of the axle 3, is formed in a shallow cap shape with a flat bottom surface, and is bolted to the axle box 2 by a mounting hole 9 provided in the outer peripheral flange 8a. The front lid 8 has a grounding device mounting hole 10 which is concentric with the axle 3, and a round shaft-shaped body portion of the grounding device housing 11 penetrates therethrough.

The grounding device housing 11 has a mounting flange 11 a on the outer circumference in the middle in the axial direction, and is fixed to a screw hole of the front lid 8 by a bolt 12 inserted into a hole of the mounting flange 11 a. The grounding device housing 11 has a brush mounting hole 13 in the center thereof, and in this hole 13, a grounding brush 14, a spring member 15, and a stopper 16 are provided in order from the inside. The ground brush 14 is a round shaft made of an alloy such as copper, tin, lead, or carbon, and is pressed against the energizing plate 5 by the spring member 15. The stop plug 16 is a set screw with a hexagonal hole that fits into a female screw at the entrance of the brush mounting hole 13, and the pressing force of the ground brush 13 can be adjusted by the screwing amount. The spring member 15 is composed of a compression coil spring or the like.

An O-ring 17 is provided at the inlet of the grounding device mounting hole 10 of the front lid 8 to seal the grounding device housing 11. In addition, a ring-shaped partition plate 18 is provided on the inner surface of the peripheral wall of the front lid 8 so as to be close to the outer diameter surface of the conductive plate 5, and a partition into which the outer periphery of the tip of the grounding device housing 11 is fitted on the front surface of the conductive plate 5. The cylinder 5a is integrally provided so as to project. The partition plate 18 and the partition cylinder 5a prevent grease or the like on the bearing 1 side from entering the contact portion between the ground brush 14 and the conductive plate 5.

According to this structure, the electric potential difference generated around the bearing 1 is released from the axle box 2 to the axle 3, the wheel and the rail via the earth brush 14 and the conductive plate 5 in the earthing device. Therefore, there is no potential difference between the bearing ring of the bearing 1 and the rolling element, and electrolytic corrosion of the bearing ring and rolling element is prevented. Further, since the ground brush 14 is in sliding contact with the conductive plate 5 on the shaft end surface at the rotation axis, the sliding speed is slower than that in the case of sliding contact at the outer diameter portion of the shaft, and the ground brush 14 and the conductive plate 5 are not worn. It will be eased. Therefore, it is possible to operate for a long period of time without replacing the ground brush 14 and the conductive plate 5.

Further, in this grounding device, a grounding device through hole 10 is provided in the front lid 8 so that the grounding device housing 11 is attached in a penetrating state, and the grounding brush 14 and the spring member 15 are accommodated therein. Since the installation space is small, the structure is simple and the cost can be reduced. Moreover, this grounding device can be handled as an integral part in which all the necessary parts are incorporated in the grounding device housing 11. In this way, the grounding brush 14 and the like have a long life, and since the whole grounding device is integrated and easy to handle, the time required for maintenance is shortened.

Although the ground brush 14 is in contact with the conductive plate 5 at the axis of the axle 3 in the above embodiment, it may be in contact with the conductive plate 5 at a position distant from the axis.

[0015]

[Effect of device]

 A grounding device for a bearing for a railroad vehicle according to the present invention is provided with a grounding device housing that penetrates the front cover, which is attached to a shaft box, and has a grounding brush and a stopper plug in a brush accommodating hole thereof. Since the spring member is provided, the structure is simple, the cost can be reduced, and the installation space can be small. In addition, the ground brush is less worn, the entire device is easy to handle, and the time required for maintenance is shortened.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a sectional view of a conventional example.

[Explanation of symbols]

1 ... Bearing, 2 ... Axle box, 3 ... Axle, 5 ... Conductive plate, 8
... Front lid, 11 ... Grounding device housing, 14 ... Grounding brush, 15 ... Spring member, 16 ... Stopper, 18 ... Partition plate

Claims (1)

[Scope of utility model registration request] 1. A grounding device housing that penetrates the front cover is provided in a front cover that covers the shaft end of the axle and is attached to the axle box, and a brush accommodating hole that axially penetrates the grounding device housing is provided. A railroad vehicle axle provided with a grounding brush whose tip is in contact with a conductive plate on the shaft end face of the axle, a stopper, and a spring member interposed between the stopper and the grounding brush to urge the grounding brush to project in the hole. Bearing grounding device.