WO2020215256A1

WO2020215256A1 - Bearing component with sensor, and bearing clearance monitoring system

Info

Publication number: WO2020215256A1
Application number: PCT/CN2019/084126
Authority: WO
Inventors: 关冉; 王爱萍
Original assignee: 舍弗勒技术股份两合公司; 关冉
Priority date: 2019-04-24
Filing date: 2019-04-24
Publication date: 2020-10-29
Also published as: CN113574290B; CN113574290A

Abstract

A bearing component with a sensor, comprising an axle box base (21), an axle box end cover (22), a bearing, and a sensor component. The bearing comprises a movable ring capable of rotating or creeping relative to the axle box base (21). The sensor component comprises the sensor, a sensor antenna, and a transceiving antenna (T14). The sensor is fixed on an end portion of the movable ring close to the axle box end cover (22) in an axial direction (A), is electrically connected to the sensor antenna, and is capable of measuring the change in the state of the movable ring, and transferring a state signal obtained by measurement to the sensor antenna. The sensor antenna can wirelessly transmit the state signal to the surrounding. The transceiving antenna (T14) is fixed on an end surface of the axle box end cover (22) facing the bearing, and can receive the state signal transmitted by the sensor antenna. According to the bearing component, the working condition of the movable ring of the bearing can be measured accurately and in real time. The present invention also relates to a bearing clearance monitoring system.

Description

Bearing assembly with sensor and bearing clearance monitoring system

Technical field

The invention relates to the field of bearings, and in particular to a bearing assembly with sensors and a bearing clearance monitoring system.

Background technique

For example, wheelset bearings for rail trains (hereinafter referred to as bearings), the temperature of the bearings will rise during the high-speed train travel. Due to the effect of thermal expansion and contraction, the clearance between the inner ring and the outer ring of the bearing is reduced, which may cause the bearing to lock in severe cases. Therefore, it is necessary to monitor the temperature of the inner ring and outer ring of the bearing.

There are several ways to monitor the temperature of the wheel bearing in the prior art.

(1) Infrared temperature sensors are installed near the train tracks to detect the temperature of the axles or axle boxes of passing vehicles. This method does not directly detect the temperature of the bearing, and can only indirectly measure the bearing temperature when the vehicle passes the sensor, but cannot measure the bearing temperature in real time. In addition, the infrared temperature sensor is easily damaged, especially considering that it is installed in an outdoor environment.

(2) A sensor is installed in the bearing housing and brought into contact with the stationary ring of the bearing (opposite the rotating ring, the stationary ring in the wheel set bearing is the outer ring of the bearing) to measure the temperature of the stationary ring. For example, Chinese patent CN1276245C discloses a technical solution for detecting the stationary ring of a bearing using a wireless temperature sensor. However, the temperature change of the bearing's rotating ring is also worth monitoring.

(3) Chinese patent CN100344974C discloses a bearing with a wireless self-powered sensor unit. In this solution, the sensor is installed between the inner ring and the outer ring (that is, the rotating ring and the stationary ring) of the bearing, so that the bearing can be measured The internal temperature. However, the arrangement of the sensor inside the bearing will affect the transmission of the sensor signal. In addition, the internal space of the bearing is small, which is not conducive to installing the transceiver antenna of the wireless sensor.

Therefore, it is necessary to provide a bearing assembly that is more convenient to accurately monitor the conditions (such as temperature) of the inner ring and/or the outer ring.

Summary of the invention

The purpose of the present invention is to overcome or at least alleviate the above-mentioned shortcomings of the prior art, and provide a bearing assembly capable of accurately measuring the condition of the movable ring of the bearing in real time.

According to a first aspect of the present invention, there is provided a bearing assembly with a sensor, which includes an axle box seat, an axle box end cover, a bearing, and a sensor assembly. The bearing is arranged in the inner cavity of the axle box seat, and the shaft The box end cover is fixed to the axial end of the axle box seat, the bearing includes a movable ring, and the movable ring can rotate or creep relative to the axle box seat, wherein,

The sensor component includes a sensor, a sensor antenna and a transceiver antenna,

The sensor is fixed to the end of the movable ring close to the end cover of the axle box in the axial direction, and the sensor is electrically connected with the sensor antenna,

The sensor can measure the change of the state of the movable coil and transmit the measured state signal to the sensor antenna, and the sensor antenna can wirelessly transmit the state signal to the surroundings,

The transceiving antenna is fixed on the end surface of the axle box end cover facing the bearing, and the transceiving antenna can receive the status signal transmitted by the sensor antenna.

In at least one embodiment, the inner ring of the bearing is the movable ring, the inner ring is assembled on the outer circumference of the shaft with an interference fit, and the inner ring can rotate relative to the axle box seat, A shaft end cover is fixed to the axial end of the shaft facing the shaft box end cover,

The sensor assembly includes a first sensor assembly, the first sensor assembly includes a first sensor and a first sensor antenna, and the first sensor is fixed to the inner ring near the axle box end cover in the axial direction. At the end, the first sensor is electrically connected to the first sensor antenna,

The shaft end cover has a middle hole axially penetrating the shaft end cover, and the first sensor antenna is fixed to the shaft end cover and is at least partially contained in the middle hole.

In at least one embodiment, the first sensor antenna is fixed to the shaft end cover by a connecting piece, the connecting piece is in the shape of a bent sheet, and one end of the connecting piece is fixed to the shaft end cover, so A part of the connecting piece is bent axially inward to extend into the middle hole, and the first sensor antenna is fixed to a part of the connecting piece that extends into the middle hole.

In at least one embodiment, the first sensor assembly further includes a first cable assembly, the shaft end cover further has a side hole axially penetrating the shaft end cover,

The first cable assembly passes through the side hole, and two ends of the first cable assembly are respectively connected to the first sensor and the first sensor antenna.

In at least one embodiment, the outer ring of the bearing is stationary relative to the axle box seat,

The sensor assembly further includes a second sensor assembly, the second sensor assembly including a second sensor and a second cable assembly,

The second sensor is fixed to the end of the outer ring that is close to the axle box end cover in the axial direction, and the second cable assembly is connected to the second sensor,

The second sensor can measure the change of the state of the outer ring and transmit the measured state signal to the second cable assembly.

In at least one embodiment, the outer ring of the bearing can creep relative to the axle box seat,

The sensor assembly further includes a second sensor assembly, and the second sensor assembly includes a second sensor, a second sensor antenna and a connection joint,

The second sensor is fixed to the end of the outer ring that is close to the axle box end cover in the axial direction, and the second sensor antenna is connected to the second sensor through the connection joint,

The second sensor can measure the change of the state of the outer ring, and transmit the measured state signal of the outer ring to the second sensor antenna, and the second sensor antenna wirelessly transmits the state signal of the outer ring to Fire around,

The outer ring status signal can be received by the transceiver antenna.

In at least one embodiment, the transceiving antenna has a disk shape, and the transceiving antenna radially covers a radial area where the second sensor antenna is located.

In at least one embodiment, the edge of the axle box end cover contacting the outer ring has a groove, and the second sensor assembly can be partially accommodated in the groove.

In at least one embodiment, the sensor is a passive temperature sensor.

According to a second aspect of the present invention, a bearing clearance monitoring system is provided, characterized in that the system includes the bearing assembly according to the present invention, and the system further includes a joint, a main cable, a data processing unit, and a communication Cables and computers,

The joint is installed on the axle box end cover, and the joint transmits the temperature signal of the inner ring measured by the first sensor assembly and the temperature signal of the outer ring measured by the second sensor assembly to the total Cable, the total cable transmits the temperature signals of the inner ring and the outer ring to the data processing unit, and the data processing unit calculates the temperature signal according to the temperature signals of the inner ring and the outer ring Bearing clearance,

The communication cable connects the data processing unit and the computer, and the computer displays the temperature of the bearing and/or the clearance of the bearing in a visual form.

According to the bearing assembly of the present invention, the working condition (for example, temperature) of the movable ring of the bearing can be measured accurately and in real time.

Description of the drawings

Fig. 1 is a schematic diagram of a bearing clearance monitoring system according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a bearing assembly according to the first embodiment of the present invention (the axle box end cover is not shown).

Fig. 3 is an axial cross-sectional view of the bearing assembly according to the first embodiment of the present invention.

Fig. 4 is an axial sectional view of a bearing assembly according to a second embodiment of the present invention.

Fig. 5 is a top view of the axle box end cover shown in Fig. 4.

Description of reference signs

11 inner ring; 12 outer ring;

21 axle box seat; 22 axle box end cover; 22A slot;

31 shaft; 32 shaft end cover; 32C middle hole; 32B side hole; 33 connecting piece;

41 connectors; 42 total cables; 43 communication cables; 44 data processing units; 45 computers;

T10 first sensor component; T11 first sensor; T12 first cable component; T13 first sensor antenna; T14 transceiver antenna;

T20 second sensor assembly; T21 second sensor; T22 second cable assembly; T23 second sensor antenna; T24 connection connector.

Detailed ways

The exemplary embodiments of the present invention are described below with reference to the drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present invention, not to exhaust all possible ways of the present invention, nor to limit the scope of the present invention.

1 to 5 introduce the bearing assembly with sensor and the bearing clearance monitoring system according to the present invention. Taking the orientation in Figure 3 as an example, the axial direction A referred to in the present invention is consistent with the axial direction of the bearing; the radial direction R referred to in the present invention is consistent with the radial direction of the bearing, and the circumferential direction referred to in the present invention is consistent with the circumferential direction of the bearing. Xiang consistent.

Taking a wheel set bearing as an example, the bearing assembly with sensor according to the present invention includes an axle box, a bearing and a sensor assembly. The bearing clearance monitoring system according to the present invention includes the bearing assembly according to the present invention, a data processing unit 44 and a computer 45. According to the different setting methods of the bogie and the axle box, the setting methods of the wheel set bearings can generally be divided into two types, namely (i) the inner ring 11 and the outer ring 12 are both tightly fitted (ie interference fit), and (ii) ) The inner ring 11 is an interference fit, and the outer ring 12 is a clearance fit. The bearing ring capable of rotating or creeping relative to the axle box seat 21 is defined as a movable ring. It should be understood that the bearing ring mentioned here can creep relative to the axle box seat 21, which mainly means that the outer ring 12 of the bearing can creep relative to the axle box seat 21. This kind of creep is manifested in that even if the outer ring 12 is not desired in the design. It creeps relative to the axle box seat 21, but in practical applications, the outer ring 12 still creeps relative to the axle box seat 21 due to various reasons. It should be understood that the "movable ring" defined here is different from the rotating ring of the bearing mentioned above; under this definition, both the stationary ring and the rotating ring of the bearing may be a movable ring, and the rotating ring of the bearing is working Obviously, it rotates relative to the axle box seat 21 while the stationary ring of the bearing may creep relative to the axle box seat 21. In the (i) installation method, the inner ring 11 is a movable ring, and the inner ring 11 can rotate relative to the axle box seat 21. In the (ii) installation method, the inner ring 11 and the outer ring 12 are both movable rings, the inner ring 11 can rotate relative to the axle box seat 21, and the outer ring 12 can creep relative to the axle box seat 21.

First introduce the bearing assembly according to the (i) installation method.

The first embodiment

1 to 3, the bearing is installed in the axle box. The axle box includes an axle box seat 21 and an axle box end cover 22 covering the end of the axle box seat 21 in the axial direction A.

When the bearing is working, its outer ring 12 is stationary relative to the axle box seat 21 and the inner ring 11 rotates. Therefore, the sensor for measuring the temperature of the inner ring 11 has high requirements for installation and positioning. The wireless temperature sensor assembly T10 (hereinafter also referred to as the first sensor) The component T10), and the sensor component for measuring the temperature of the outer ring 12 is relatively simple to install, and a wired temperature sensor component T20 (hereinafter also referred to as the second sensor component T20) can be used.

First, the setting method of the second sensor assembly T20 is introduced. The second sensor assembly T20 includes a sensor T21 (also called a second sensor T21) and a cable assembly T22 (also called a second cable assembly T22) for measuring temperature. The sensor T21 is fixed on the axial end of the outer ring 12 close to the axle box end cover 22, and the cable assembly T22 is electrically connected to the sensor T21 for further transmitting the signal detected by the sensor T21 downstream.

The connection between the sensor T21 and the outer ring 12 is, for example, a threaded connection. For example, a threaded hole extending along the axial direction A is provided at the end of the outer ring 12, and a threaded cable plug is provided at the end of the cable assembly T22 connected with the sensor T21 The cable connector fixes the sensor T21 to the threaded hole of the outer ring 12, so that the sensor T21 can be in good contact with the outer ring 12, and the sensor T21 is sealed against water.

The sensor T21 and the following sensor T11 are contact temperature sensors (also called thermometers), such as pressure thermometers, resistance thermometers, thermistors, thermocouples, and semiconductor temperature sensors.

Next, the setting method of the first sensor assembly T10 is introduced. The first sensor component T10 includes a sensor T11 (also called the first sensor T11) for measuring temperature, a cable component T12 (also called the first cable component T12), a sensor antenna T13 (also called the first sensor antenna T13) and Transceiver antenna T14.

The sensor T11 is fixed to the axial end of the inner ring 11 close to the axle box end cover 22, for example, a threaded hole extending in the axial direction A is provided at the end of the inner ring 11 for fixing the sensor T11. The cable assembly T12 connects the sensor T11 and the sensor antenna T13. The transmitting and receiving antenna T14 is fixed to the end cover 22 of the axle box.

The inner ring 11 is connected with the shaft 31 in an interference fit, and the shaft 31 is fixed with a shaft end cover 32 by screws at one end of the shaft 31 close to the shaft box end cover 22 in the axial direction A.

When the bearing is working, the inner ring 11, the shaft 31, the shaft end cover 32, the sensor T11, the cable assembly T12 and the sensor antenna T13 rotate synchronously relative to the axle box, and the transceiver antenna T14 is stationary relative to the axle box.

In order to facilitate the fixing of the cable assembly T12 and the sensor antenna T13, the middle part of the shaft end cover 32 is provided with a middle hole 32C penetrating in the axial direction A, and the radial outside of the shaft end cover 32 is provided with a side penetrating in the axial direction A孔32B.

The end of the shaft end cover 32 close to the shaft box end cover 22 in the axial direction A is fixed with a connecting piece 33. The connector 33 has a sheet shape (for example, a bent long sheet shape), one end of which is fixed to the shaft end cover 32 by a screw, and the other end extends inward in the radial direction R and is bent inward in the axial direction A to extend into In the middle hole 32C. The sensor antenna T13 is fixed to the other end of the connecting member 33, so that the sensor antenna T13 can be at least partially accommodated in the middle hole 32C without occupying too much axial space inside the bearing assembly. Preferably, the sensor antenna T13 is located at the center of rotation of the shaft 31, so that when the shaft 31 rotates, the sensor antenna T13 has a small turning radius, small centrifugal force, stable motion state, and stable transmission and reception of signals.

The side hole 32B is connected to the threaded hole at the end of the inner ring 11 for fixing the sensor T11. One end of the cable assembly T12 is connected to the sensor T11, and the other end passes through the side hole 32B and then extends radially inwardly into the middle hole 32C. Connect the sensor antenna T13. The cable assembly T12 preferably uses a semi-rigid cable to ensure that it has a certain flexibility, can be bent and wired according to the space inside the bearing assembly, and has a certain strength and is easy to fix.

The transceiving antenna T14 is used to receive the signal of the sensor antenna T13 and transmit the signal further downstream. The transceiving antenna T14 is fixed on the end surface of the axle box end cover 22 on the axial inner side. Preferably, the area covered by the transceiving antenna T14 in the radial direction is larger than the area covered by the sensor antenna T13 in the radial direction.

The sensor T11 is a passive (self-powered) sensor, which, for example, can obtain a working voltage through an electromagnetic effect or a piezoelectric effect without connecting an additional power source. The wireless propagation mode of the signal of the sensor T11 is, for example, propagation through acoustic waves or radio frequency signals. For the specific configuration of the passive wireless sensor, for example, refer to Patent CN100344974C or Patent Publication CN105222919A, which will not be repeated in the present invention.

A joint 41 is provided through the axle box end cover 22, and the cables of the cable assembly T22 and the transceiver antenna T14 are gathered at the joint 41, and then output to the outside of the bearing assembly by the main cable 42 connected to the joint. The main cable 42 is connected to the data processing unit 44 (refer to Figure 1). The data processing unit 44 converts the real-time temperature signals collected by the sensor T21 and the sensor T11 into the bearing according to the built-in program (considering the parameters including the material and structural dimensions of the bearing) The real-time dimensional changes of the outer ring 12 and the inner ring 11. In order to facilitate the visualization of control parameters, the data processing unit 44 is also connected to a computer 45 through a communication cable 43. The computer 45 can visualize the real-time temperature of the outer ring 12 and the inner ring 11 of the bearing and changes in the bearing clearance according to a built-in program Form display.

Maintenance personnel can also use the measured data as feedback data for bearing clearance design, or can set reasonable warning temperature values to provide alarms to relevant personnel.

Second embodiment

Referring to Figures 4 and 5, the following describes how the sensor assembly is arranged in an assembly manner where the outer ring 12 of the bearing has a certain clearance.

In this embodiment, the inner ring 11 rotates following the shaft 31 when the bearing is working, and the outer ring 12 may slowly creep relative to the axle box seat 21 in the circumferential direction. The arrangement of the first sensor assembly T10 for measuring the temperature of the inner ring 11 is the same as that of the first embodiment, while the second sensor assembly T20 for measuring the temperature of the outer ring 12 uses the same as the first sensor assembly T10. The way of wireless transmission of signals. The following mainly introduces the setting method of the second sensor assembly T20.

The second sensor assembly T20 includes a (second) sensor T21, a connection joint T24 and a (second) sensor antenna T23. The sensor T21 is fixed on the axial end of the outer ring 12 close to the axle box end cover 22, one end of the connection joint T24 is connected to the sensor T21, and the other end extends radially inward and axially outward and connects to the sensor antenna T23.

The transmitting and receiving antenna T14 has a disc shape and is fixed on the end surface of the axle box end cover 22 on the axial inner side. The transceiver antenna T14 covers the radial area where the sensor antenna T23 is located in the radial direction R, so the transceiver antenna T14 can receive signals from the sensor antenna T23 and the sensor antenna T13 at the same time, and even if the sensor antenna T23 follows the outer ring 12 to creep in the circumferential direction , The transceiver antenna T14 can still receive the signal from the sensor antenna T23. The transceiver antenna T14 is connected to the main cable 42 through a joint 41 to further transmit the signal downstream.

In order to save the axial space of the bearing assembly, and at the same time to prevent the second sensor assembly T20 from interfering with the axle box end cover 22 during the creeping process with the outer ring 12, the edge of the axle box end cover 22 that contacts the outer ring 12 is provided with a groove 22A That is, the edge of the axle box end cover 22 that is in contact with the outer ring 12 is incomplete in the circumferential direction and is interrupted in the form of notches by the groove 22A, and the second sensor assembly T20 can be partially accommodated in the groove 22A.

The following briefly describes some of the beneficial effects of the above-mentioned embodiments of the present invention.

(i) The sensor T21 and the sensor T11 are in contact with the outer ring 12 and the inner ring 11 of the bearing, respectively, and can accurately measure the temperature of the outer ring and the inner ring of the bearing in real time.

(ii) By using passive wireless sensors, the sensors can be effectively connected to the movable ring of the bearing and transmit signals.

(iii) The transceiver antenna T14 of the wireless sensor assembly is fixed to the axle box end cover 22, and the transceiver antenna T14 does not rotate with the bearing and can receive signals from the sensor antenna.

(iv) By monitoring the temperature of the outer ring 12 and the inner ring 11 of the bearing in real time, the bearing clearance can be calculated in real time, which can avoid adverse consequences such as bearing lockup caused by too small bearing clearance.

(v) The sensor assembly will not increase (or will not increase too much) the axial size of the axle box.

It should be understood that the above-mentioned embodiments are only exemplary and are not used to limit the present invention. Those skilled in the art can make various modifications and changes to the above-mentioned embodiments under the teaching of the present invention without departing from the scope of the present invention. E.g,

(i) The bearing assembly according to the present invention is not limited to wheelset bearing assemblies for rail vehicles. The bearings in the bearing assembly can be tapered roller bearings, cylindrical roller bearings, ball bearings, spherical roller bearings (aligning roller bearings) and sliding bearings.

(ii) The sensor T11 and the sensor T21 may also be sensors capable of measuring other states of the bearing. For example, the sensor T11 and the sensor T21 may also be vibration sensors or acceleration sensors.

Claims

A bearing assembly with a sensor, which comprises an axle box seat (21), an axle box end cover (22), a bearing, and a sensor assembly. The bearing is arranged in the inner cavity of the axle box seat (21), and the shaft A box end cover (22) is fixed to the axial end of the axle box seat (21), the bearing includes a movable ring, and the movable ring can rotate or peristally relative to the axle box seat (21), among them,

The sensor component includes a sensor, a sensor antenna and a transceiver antenna (T14),

The sensor is fixed to the end of the movable ring near the axle box end cover (22) in the axial direction (A), and the sensor is electrically connected with the sensor antenna,

The sensor can measure the change of the state of the movable coil and transmit the measured state signal to the sensor antenna, and the sensor antenna can wirelessly transmit the state signal to the surroundings,

The transceiving antenna (T14) is fixed on the end surface of the axle box end cover (22) facing the bearing, and the transceiving antenna (T14) can receive the status signal transmitted by the sensor antenna.
The bearing assembly according to claim 1, characterized in that the inner ring (11) of the bearing is the movable ring, and the inner ring (11) is used to fit the shaft (31) with an interference fit. On the outer periphery, the inner ring (11) can rotate relative to the axle box seat (21), and the axial end of the shaft (31) facing the axle box end cover (22) is fixed with a shaft end cover ( 32),

The sensor assembly includes a first sensor assembly (T10), the first sensor assembly (T10) includes a first sensor (T11) and a first sensor antenna (T13), and the first sensor (T11) is fixed to the The inner ring (11) is close to the end of the axle box end cover (22) in the axial direction, and the first sensor (T11) is electrically connected to the first sensor antenna (T13),

The shaft end cover (32) has a middle hole (32C) axially penetrating the shaft end cover (32), and the first sensor antenna (T13) is fixed to the shaft end cover (32) and is at least partially The ground is received in the middle hole (32C).
The bearing assembly according to claim 2, wherein the first sensor antenna (T13) is fixed to the shaft end cover (32) through a connecting piece (33), and the connecting piece (33) is bent One end of the connecting piece (33) is fixed to the shaft end cover (32), and a part of the connecting piece (33) is bent axially inward to extend into the middle hole (32C) In ), the first sensor antenna (T13) is fixed to the part of the connecting piece (33) that extends into the middle hole (32C).
The bearing assembly according to claim 2, wherein the first sensor assembly (T10) further comprises a first cable assembly (T12), and the shaft end cover (32) further has an axially penetrating shaft The side hole (32B) of the end cover (32),

The first cable assembly (T12) passes through the side hole (32B), and two ends of the first cable assembly (T12) are respectively connected to the first sensor (T11) and the first sensor antenna (T13).
The bearing assembly according to claim 2, characterized in that the outer ring (12) of the bearing is stationary with respect to the axle box seat (21),

The sensor assembly further includes a second sensor assembly (T20), and the second sensor assembly (T20) includes a second sensor (T21) and a second cable assembly (T22),

The second sensor (T21) is fixed to the end of the outer ring (12) close to the axle box end cover (22) in the axial direction, and the second cable assembly (T22) is connected to the first Two sensors (T21),

The second sensor (T21) can measure the change of the state of the outer ring (12) and transmit the measured state signal to the second cable assembly (T22).
The bearing assembly according to claim 2, characterized in that the outer ring (12) of the bearing can creep relative to the axle box seat (21),

The sensor assembly further includes a second sensor assembly (T20), and the second sensor assembly (T20) includes a second sensor (T21), a second sensor antenna (T23) and a connection joint (T24),

The second sensor (T21) is fixed to the end of the outer ring (12) near the axle box end cover (22) in the axial direction (A), and the second sensor antenna (T23) passes through the The connecting connector (T24) is connected to the second sensor (T21),

The second sensor (T21) can measure the change of the state of the outer ring (12) and transmit the measured state signal of the outer ring to the second sensor antenna (T23), and the second sensor antenna ( T23) Transmit the outer ring status signal to the surrounding wirelessly,

The outer ring status signal can be received by the transceiver antenna (T14).
The bearing assembly according to claim 6, wherein the transmitting and receiving antenna (T14) is in the shape of a disc, and the transmitting and receiving antenna (T14) radially covers the radial direction where the second sensor antenna (T23) is located. area.
The bearing assembly according to claim 5 or 6, characterized in that the edge of the axle box end cover (22) contacting the outer ring (12) has a groove (22A), and the second sensor assembly ( T20) can be partially contained in the groove (22A).
The bearing assembly of claim 1, wherein the sensor is a passive temperature sensor.
A bearing clearance monitoring system, characterized in that the system comprises the bearing assembly according to any one of claims 5 to 9, and the system further comprises a joint (41), a main cable (42), and data Processing unit (44), communication cable (43) and computer (45),

The joint (41) is installed on the axle box end cover (22), and the joint (41) connects the temperature signal of the inner ring (11) measured by the first sensor assembly (T10) and the first The temperature signal of the outer ring (12) measured by the second sensor assembly (T20) is transmitted to the overall cable (42), and the overall cable (42) connects the inner ring (11) and the outer ring (12) ) Is transmitted to the data processing unit (44), and the data processing unit (44) calculates the bearing clearance according to the temperature signals of the inner ring (11) and the outer ring (12),

The communication cable (43) connects the data processing unit (44) and the computer (45), and the computer (45) visualizes the temperature of the bearing and/or the clearance of the bearing display.