JPS6030828A - Device for preventing stray currnet corrosion of sealed bearing for railway rolling stock axle - Google Patents

Abstract

PURPOSE:To prevent the stray current corrosion of a sealed type bearing for rolling stock by installing a terminal for earthing through a small-size ball-and- roller bearing on the center of a front cover fixed to an axle and earthing a leakage current through a route of said front cover and axle. CONSTITUTION:An earthing terminal 11 is fitted to and supported by the center of a front cover 7 fixed to the shaft end of an axle 6 through a ball-and-roller bearing such as a ball bearing, etc. by means of a bolt 8, electrically connecting a bogie frame 1 and the earthing terminal 11 through a conductive member 12. As a result, a leakage current, which flows from an electric locomotive, an electric motor passenger car, etc. to a freight car, an electric motor passenger car, etc. through a coupler, can be earthed from a bogie 1 or a saddle 2 through a route of the conductive member 12, earthing terminal 11, ball-and-roller bearing 10, front cover 7, and axle 6. Accordingly, a leakage current can be prevented from flowing in a sealed type bearing for axle.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an electrolytic corrosion prevention device for a sealed bearing for an axle in a railway vehicle.

As the axle bearings, many sealed tapered roller bearings and sealed cylindrical roller bearings are used.
In railway vehicles such as electric passenger cars that run on electricity as a power source, in order to prevent damage such as electrolytic corrosion to vehicle parts due to leakage current from the electric circuit, there is a A grounding device is provided.

On the other hand, vehicles that are towed by other motive vehicles, such as non-electric passenger cars and freight cars, are not equipped with grounding devices because they do not have any parts to which electricity is originally supplied. However, even in freight cars that do not originally require electricity, leakage current from electric locomotives, etc. is transmitted through the coupler, and returns to the rails via the wheels of the freight car. This causes electrolytic corrosion in the bearing, significantly shortening its lifespan.

FIG. 1 is a sectional view illustrating a conventional axle bearing,
As mentioned above, the leakage current transmitted through the coupler is caused by the following: bogie frame l - head 2 - 1 + l + receiving outer ring 3 - rollers 4 - bearing inner ring 5 -
It will return in the order of wheel - rail - earth via the path of axle 6, but the inner and outer rings of the bearing 5, 3 and 4
Normally, a lubricating oil film is formed between the two and electrically insulated, and when this oil film is momentarily ruptured, metal contact occurs and current flows, causing electrolytic corrosion. Cause. Reference numeral 7 denotes a front cover located at the end of the axle 6 via a port 8.

The above-mentioned single-row tapered roller bearing (or double-row cylindrical roller bearing), which is widely used for axles, is a sealed type.
Although it is designed so that the load is applied equally to each row of rollers, in reality, the load distribution may not always be equal due to the processing accuracy of each part, installation errors, vehicle running conditions, etc. The contact between the rollers in the row and the bearing ring may momentarily become unstable for some reason, and it is thought that the oil film breakage occurs at such times. This type of sealed axle bearing differs from normal axle bearings in that it does not have an axle box and only has a head placed directly on top of the bearing, and the front cover is fixed to the axle. Since the motor rotates with the axle, there is no additional grounding device attached to prevent the single-pole corrosion, and therefore there is no way to effectively prevent the occurrence of electrolytic corrosion.

In order to eliminate such inconveniences, the applicant of the present application proposed an electrolytic corrosion prevention device as disclosed in Japanese Patent Application Laid-Open No. 58-47652. However, since the brush electrically connected to the bogie frame etc. is brought into sliding contact with the outside of the front cover that rotates with the axle, the outer periphery of the front cover is connected to the axle and the rotating cylinder. It is necessary to form on the surface, and it is necessary to take measures against wear of the front cover and brush. There were problems such as heat generation on the sliding surface between the brush and the front cover, and there were drawbacks such as the need to pay close attention to processing and assembly.

This invention solves the above-mentioned drawbacks of the conventional device, and provides a railway vehicle with a simple structure and extremely easy maintenance, replacement, etc., especially in which the front cover rotates together with the axle. The object of the present invention is to provide an electrolytic corrosion prevention device for sealed axle bearings in railway vehicles such as non-electric passenger cars and freight cars.

In this invention, a ground terminal is attached to the center of the front cover fixed to the axle via a small rolling bearing such as a ball bearing, and the terminal is electrically connected to non-rotating members on the bogie side such as the bogie frame and saddle. The invention is characterized in that the leakage current is connected to the front lid and the axle through the rolling bearing and grounded through the front lid-axle path.

The present invention will now be described in detail with reference to the illustrated embodiment.A ground terminal 11 is connected to the center of a front cover 7 fixed to the shaft end of an axle 6 with bolts 8, etc. via a rolling bearing such as a ball bearing 1O.
The bogie frame 1 and the ground terminal 11 are electrically connected by a conductive member 12. A conductive wire or the like may be used as the conductive member 12, but in order to prevent the ground terminal 11 from making a huge turn together with the axle 6, it is also possible to fix its constricted portion to the bogie frame 1 as a metal strip. good.

A taper screw hole 13 for a greasing nipple device is generally provided in the center of the front cover 7. Therefore, a support shaft 14 is mounted and fixed in this hole 13, and the inner ring 15 of the ball bearing 10 is mounted on the shaft 14. The ground terminal 11 is screwed onto the case 17 into which the outer ring 16 is fitted, and the terminal 11 is supported by the outer ring 16. 18 is a retaining ring for mounting the ball bearing 10 on the support 1jj14. The ball bearings 10 may be provided in double rows as shown in FIG. 4, and may be configured to be preloaded by a disc spring 19 or the like.

The embodiment shown in FIG. 5 has a bearing fitting hole 20 in the center of the front cover 7.
A bearing case 21 in which the outer ring 16 of the ball bearing 10' is fitted is screwed or fitted into the hole 20, and a ground terminal 11' formed in the shape of a shaft is connected to the inner ring 15 with a retaining ring 22, etc. It is supported and fixed through.

In the case of FIG. 5, the other end of the conductive member 12 is fixed to the saddle 2 and electrically connected. In FIG. 5, it goes without saying that the bearing case 21 may be omitted and the bearing outer ring 16 may be directly fitted and fixed in the bearing fitting hole 20.

Since this invention has the above configuration, an electric locomotive,
Leakage current conducted from an electric passenger car etc. to a freight car or an electric passenger car etc. via a coupler is transferred from the bogie frame or saddle to the conductive member 1.
2-Grounding terminal 11-Rolling bearing (small ball bearing 1O)-
The front lid 7--axle 6 path is grounded, and the inconvenience that leakage "tc ff1E flows into the K'tll bud" type 1 bearing is eliminated.

According to this invention, the axle Ti-I V side type φi
ii Inner ring 'I'lel 5 of the receiver, each orbit of the outer ring 3 jlj
Not only will there be no damage due to the electrical storage on the same side of I and roller 4, but also the ground terminals 1], 11'Qf4iii
The i! Since the rollers are arranged and supported through the bearing 10 and IO', the rotational circumferential speed of the relative rotation part of the roller p bearing is such that the brush is in contact with the conventional nl-1 indigo outer periphery. The rotational speed of the sliding part is much smaller than that of the
There is no fear of wear, heat generation, etc., and the structure is significantly simplified.

In addition, in this invention, the roller located at the center of the front cover becomes a path for leakage current between the inner and outer shafts of the yoke and bridge through rolling elements such as copper balls, and electrolytic corrosion may occur in this area. It is possible, but since this bearing only has to play the role of a passageway for lightning, it is necessary to
It is only necessary to replace the bearing periodically (until the rotation of the bearing is affected), and there is no difficulty in the replacement work, and the ball is even smaller! Since it is sufficient to use an inexpensive item such as an Ili holder, maintenance and inspection are extremely easy, and there is no need to take special measures against wear on the front cover.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an example of a sealed bearing for a railway vehicle axle, Fig. 2 is a longitudinal sectional view of an embodiment of the invention, Fig. 3 is an enlarged sectional view of the main parts, Figs. The figures are enlarged sectional views of main parts of other embodiments. 1... bogie frame, 2... saddle, 6... axle, 7...
・Front cover, 10, 10'...Ball bearing, 11, 11'
...Grounding terminal, 12...Conductive member, 14...Spindle, 15...Inner ring, 16...Outer ring Applicant Koyo Seiko Co., Ltd. Agent Goho - Keiji Figure 1 Figure 2 Figure 4 Figure 5

Claims (1)

[Claims] (11 A ground terminal is attached and supported via a rolling bearing at the center of the front cover fixed to the axle, and the ground terminal and the bogie frame are
Electrolytic corrosion prevention device for a sealed bearing for a railway vehicle axle, characterized in that a non-rotating member on the bogie side such as a saddle is electrically connected via a conductive member (2) The inner ring of the rolling bearing is Electrolytic corrosion prevention device (3) for a sealed bearing for a railway vehicle axle according to claim (1), wherein the ground terminal is fitted and supported on a support shaft fixedly attached to the center of the rolling bearing, and the ground terminal is supported on an outer ring of the rolling bearing. The railway vehicle according to claim (1), wherein the outer ring of the rolling bearing is fitted and fixed into a support hole provided at the center of the front cover, and the ground terminal is fitted and supported by the inner ring of the rolling bearing. Electrolytic corrosion prevention device for sealed bearings for axles