JP2004150504A - Bearing with sensor for rolling stock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing with sensors for a rolling stock capable of improving the accuracy in diagnosing the abnormality of a temperature of an axle. <P>SOLUTION: This bearing comprises an inside temperature detecting sensor 5 for detecting a temperature inside of the bearing 1, and an outside temperature detecting sensor 6 for detecting a temperature outside of the bearing 1. A sensor supporting member 4 is mounted on an end part of an axle box 3, the inside temperature detecting sensor 5 is mounted at a side faced to the axle of the sensor supporting member 4, and the outside temperature detecting sensor 6 is mounted at a radial outer side of the sensor supporting member 4. The abnormality of the axle is detected on the basis of the difference between the output of the inside temperature detecting sensor 5 and the output of the outside temperature detecting sensor 6. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bearing with a sensor for railway vehicles capable of detecting temperature.
[0002]
[Prior art]
Conventionally, temperature detection of an axle for a railway vehicle has been performed by one temperature sensor provided on a bearing with a sensor for a railway vehicle (see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-9-79915 (FIG. 1)
[0004]
[Problems to be solved by the invention]
In the above-mentioned conventional bearing with a sensor for railway vehicles, although the outside air temperature differs between summer and winter by about 35 ° C., the temperature is detected by only one temperature sensor. There was a problem that it could not be fixed. To cope with this problem, techniques such as changing the threshold value according to the season and temperature, and creating a database considering the season and temperature and making a decision based on this have been adopted. It did not balance high accuracy.
[0005]
An object of the present invention is to provide a railway vehicle sensor-equipped bearing capable of reducing the influence of a temperature difference between summer and winter, thereby improving the accuracy of diagnosis of axle temperature abnormality without performing complicated processing. It is in.
[0006]
Means for Solving the Problems and Effects of the Invention
A bearing with a sensor for a railway vehicle according to the present invention is a bearing with a sensor for a railway vehicle including a bearing having an inner ring rotating with an axle and an outer ring fixed to an axle box, and a sensor device attached to the bearing. It is characterized by comprising an internal temperature detection sensor for detecting the temperature inside the bearing and an external temperature detection sensor for detecting the temperature outside the bearing.
[0007]
The internal temperature detection sensor is, for example, a shaft temperature detection sensor that detects the temperature of the axle, but may be a temperature detection sensor that detects a portion representing the temperature of the bearing, such as a bearing ring or between the inner and outer bearing rings. . Further, the external temperature detection sensor is, for example, an outside air temperature detection sensor that detects the temperature of the outside air, but is hardly affected by the internal temperature of the bearing and easily changes according to the outside air temperature. It may be a temperature detection sensor that detects the temperature of the part protruding to the side.
[0008]
According to the bearing with a sensor for a railway vehicle of the present invention, by using two sensors, the influence of a temperature difference can be compensated, and abnormality diagnosis with a threshold set to one level can be performed.
[0009]
A sensor support member is attached to the end of the axle box from the radial outside with respect to the axle, the internal temperature detection sensor is on the side facing the axle of the sensor support member, and the external temperature detection sensor is on the radial outside of the sensor support member. It is preferable that each is provided. In this case, the two temperature sensors can be easily attached without interfering with the vehicle.
[0010]
The sensor device preferably has a processing circuit for detecting an axle abnormality based on a difference between the output of the internal temperature detection sensor and the output of the external temperature detection sensor. In this case, since the difference between the output of the internal temperature detection sensor and the output of the external temperature detection sensor does not greatly differ between summer and winter, the threshold value for diagnosing an abnormality based on the difference between the output is set between summer and winter. , It is not necessary to change it, and stable and accurate diagnosis using the same threshold can be performed throughout the year.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0012]
As shown in FIG. 1, the sensor-equipped bearing for a railway vehicle includes a bearing (1) and a sensor device (2) provided therein.
[0013]
The bearing (1) has an inner ring fitted and fixed to an axle (not shown) of a railway vehicle and rotating with the axle, and an outer ring thereof is fixed to an axle box (3).
[0014]
The sensor device (2) is mounted on the end of the axle box (3) (and, therefore, in the axle direction from the holding plate (7) that covers the end of the axle) from the outside of the axle in the radial direction. A member (4), a shaft temperature detection sensor (5) serving as an internal temperature detection sensor provided on the side facing the axle of the sensor support member (4), and provided radially outside the sensor support member (4). An outside air temperature detection sensor (6) as an external temperature detection sensor is provided.
[0015]
FIG. 2 shows a sensor processing circuit of a bearing with a sensor for a railway vehicle according to the present invention. In FIG. 2, the temperature data from the two temperature detection sensors (5) and (6) passes through the first comparator (11) and is obtained as an axle temperature in which the outside air temperature is compensated. The second comparator (12) compares the threshold with a threshold, and the determination circuit (13) determines whether or not the abnormality is present. Thus, by using the two temperature detection sensors (5) and (6), the influence of the temperature difference can be compensated, and the abnormality diagnosis with the threshold set to one level can be performed. That is, assuming that the summer bearing internal temperature is T _S , the winter bearing internal temperature is T _W , the summer outside air temperature is A _S , and the winter outside air temperature is A _W , T _S ≫T _W and (T _S −A _S ) ≒ (T _W −A _W ), and the difference between the output of the internal temperature detection sensor (5) and the output of the external temperature detection sensor (6) does not greatly differ between summer and winter. There is no need to change the threshold for diagnosing an abnormality from the difference in output between summer and winter, and stable and accurate diagnosis using the same threshold throughout the year can be performed.
[0016]
The processing circuit may be provided on the sensor support member (4), or the processing circuit provided on the railway vehicle side via the signal line or the wireless antenna through the data of the temperature detection sensors (5) and (6). To be processed.
[Brief description of the drawings]
FIG. 1 is a view showing one embodiment of a bearing with a sensor for a railway vehicle according to the present invention.
FIG. 2 is a diagram showing a processing circuit of a sensor-equipped bearing for a railway vehicle according to the present invention.
[Explanation of symbols]
(1) Bearing (2) Sensor device (3) Shaft box (4) Sensor support member (5) Shaft temperature detection sensor (internal temperature detection sensor)
(6) Outside air temperature detection sensor (external temperature detection sensor)

Claims (3)

In a bearing with a sensor for a railway vehicle comprising a bearing having an inner ring rotating with an axle and an outer ring fixed to an axle box, and a sensor device attached to the bearing, the sensor device is an internal temperature detection sensor for detecting the temperature inside the bearing. A bearing with a sensor for railway vehicles, comprising an external temperature detection sensor for detecting the temperature outside the bearing. A sensor support member is attached to the end of the axle box from the outside in the radial direction with respect to the axle, the internal temperature detection sensor is on the side facing the axle of the sensor support member, and the external temperature detection sensor is on the radial outside of the sensor support member. The bearing with a sensor for a railway vehicle according to claim 1, wherein the bearing is provided. 3. The bearing with a sensor for a railway vehicle according to claim 1, wherein the sensor device has a processing circuit for detecting an abnormality of the axle based on a difference between an output of the internal temperature detection sensor and an output of the external temperature detection sensor.

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