阅读说明：本技术 轴承及密封装置、轴承轴向游隙监测装置及监测方法 (Bearing, sealing device, bearing axial clearance monitoring device and monitoring method ) 是由 吴丽娟 蔡福强 刘鑫 贾宪林 于 2020-07-29 设计创作，主要内容包括：本发明实施例提供一种轴承及密封装置,轴承轴向游隙监测装置及监测方法,密封装置包括：防尘环,适于与轴承的轴承内圈固定；骨架,整体呈环形结构,适于与轴承的轴承外圈固定,骨架上固定有支撑唇,支撑唇适于抵接于防尘环的径向部；弹簧,待将密封装置安装于轴承内圈和轴承外圈之间后,弹簧呈压缩状态,且弹簧的两端分别抵接于骨架和支撑唇,弹簧的轴线平行于骨架的轴线；压力传感器,设置于弹簧的与骨架相接触的轴向端部或者与支撑唇相接触的轴向端部,适于监测弹簧的压力,得到压力信号。本发明实施例提供的密封装置能够为获取轴承轴向游隙的变化提供基础,即后续根据压力传感器的压力信号能够实现对轴承轴向游隙的监测。(The embodiment of the invention provides a bearing and a sealing device, and a bearing axial clearance monitoring device and a monitoring method, wherein the sealing device comprises: the dustproof ring is suitable for being fixed with a bearing inner ring of the bearing; the framework is of an annular structure and is suitable for being fixed with a bearing outer ring of the bearing, and a support lip is fixed on the framework and is suitable for abutting against the radial part of the dust-proof ring; the spring is in a compressed state after the sealing device is arranged between the bearing inner ring and the bearing outer ring, two ends of the spring are respectively abutted against the framework and the supporting lip, and the axis of the spring is parallel to the axis of the framework; the pressure sensor is arranged at the axial end part of the spring, which is contacted with the framework, or the axial end part of the spring, which is contacted with the supporting lip, and is suitable for monitoring the pressure of the spring to obtain a pressure signal. The sealing device provided by the embodiment of the invention can provide a basis for obtaining the change of the axial clearance of the bearing, namely the monitoring of the axial clearance of the bearing can be realized according to the pressure signal of the pressure sensor.)

1. A seal assembly, comprising:

the dustproof ring is suitable for being fixed with a bearing inner ring of the bearing;

the framework is of an annular structure and is suitable for being fixed with a bearing outer ring of the bearing, a supporting lip is fixed on the framework and is suitable for abutting against the radial part of the dustproof ring;

the spring is arranged between the framework and the supporting lip, after the sealing device is arranged between the bearing inner ring and the bearing outer ring, the spring is in a compressed state, two ends of the spring are respectively abutted against the framework and the supporting lip, and the axis of the spring is parallel to the axis of the framework;

the pressure sensor is arranged at the axial end part of the spring, which is in contact with the framework, or the axial end part of the spring, which is in contact with the supporting lip, and is suitable for monitoring the pressure of the spring to obtain a pressure signal.

2. The sealing device of claim 1, further comprising:

the rigid piece is fixed on the supporting lip, and the spring abuts against or is fixed on the rigid piece abutting against the supporting lip.

3. The seal of claim 2, wherein said support lip defines a mounting hole,

the rigid member is fixed to the support lip by being inserted into the mounting hole of the support lip.

4. The sealing device according to claim 2, wherein at least one of the rigid member and the frame defines a positioning slot, and the axial end of the spring abuts against the rigid member or/and the frame by abutting against the positioning slot.

5. The seal of claim 2, wherein the rigid member is a carbon plate.

6. A sealing device according to any one of claims 1 to 5, wherein the number of said springs is at least two, each of said springs being evenly distributed along the circumference of said sealing device.

7. The sealing device of any one of claims 1-5, further comprising:

the dustproof sealing lip is fixed on the framework and abutted against the axial portion of the dustproof ring, the dustproof sealing lip is located on the inner side of the supporting lip, and the dustproof sealing lip is made of conductive rubber.

8. A bearing comprising an inner bearing ring, an outer bearing ring and a seal according to any one of claims 1 to 7.

9. The utility model provides a bearing axial play monitoring devices which characterized in that includes:

the sealing device of any one of claims 1-7;

and the processor is suitable for acquiring the maximum compression variation of the spring within a preset time interval according to the pressure signal, and controlling the alarm unit to alarm when the maximum compression variation is larger than a preset safety threshold.

10. A bearing axial play monitoring method, comprising:

acquiring a pressure signal using a sealing device according to any one of claims 1 to 7;

and acquiring the maximum compression variation of the spring within a preset time interval according to the pressure signal, and controlling an alarm unit to give an alarm when the maximum compression variation is larger than a preset safety threshold.

Technical Field

The embodiment of the invention relates to the technical field of mechanical sealing, in particular to a bearing, a sealing device, a bearing axial clearance monitoring device and a monitoring method.

Background

Because the wheel needs to swing from side to side in the running process of the train, the wheel shaft and the bearing inner ring always swing, and therefore a certain axial clearance is arranged between the inner ring and the outer ring of the wheel pair bearing to prevent the bearing from being blocked. If the assembly of the wheel set bearing is inaccurate, or the bearing inner ring becomes loose due to the failure of clamping pieces (such as a front cover, a bolt and a rear stop), or the bearing is worn, the play between the inner ring and the outer ring can be enlarged.

The axial clearance of the bearing is too large, so that the impact on each part of the bearing is large, even the inner ring of the bearing is possibly separated, the bearing is damaged, and the occurrence of the accident of car overturning and derailing is caused.

Therefore, how to monitor the axial play change of the bearing during operation becomes a technical problem to be solved urgently by those skilled in the art.

Disclosure of Invention

The technical problem solved by the embodiment of the invention is to monitor the axial play change of the bearing during operation.

To solve the above problem, an embodiment of the present invention provides a sealing device, including:

the dustproof ring is suitable for being fixed with a bearing inner ring of the bearing;

the framework is of an annular structure and is suitable for being connected with a bearing outer ring strand sin of the bearing, a supporting lip is fixed on the framework and is suitable for abutting against the radial part of the dustproof ring;

the spring is arranged between the framework and the supporting lip, after the sealing device is arranged between the bearing inner ring and the bearing outer ring, the spring is in a compressed state, two ends of the spring are respectively abutted against the framework and the supporting lip, and the axis of the spring is parallel to the axis of the framework;

the pressure sensor is arranged at the axial end part of the spring, which is in contact with the framework, or the axial end part of the spring, which is in contact with the supporting lip, and is suitable for monitoring the pressure of the spring to obtain a pressure signal.

Optionally, the sealing device further comprises:

the rigid piece is fixed on the supporting lip, and the spring abuts against or is fixed on the rigid piece abutting against the supporting lip.

Optionally, the supporting lip is provided with a mounting hole, and the rigid member is fixed to the supporting lip by being embedded in the mounting hole of the supporting lip.

Optionally, at least one of the rigid member and the frame is provided with a positioning groove, and an axial end of the spring abuts against the rigid member or/and the frame by abutting against the positioning groove.

Optionally, the rigid member is a carbon plate.

Optionally, the number of the springs is at least two, and the springs are uniformly distributed along the circumferential direction of the sealing device.

Optionally, the sealing device further includes:

the dustproof sealing lip is fixed on the framework and abutted against the axial portion of the dustproof ring, the dustproof sealing lip is located on the inner side of the supporting lip, and the dustproof sealing lip is made of conductive rubber.

In order to solve the above problem, an embodiment of the present invention further provides a bearing, which includes a bearing inner ring, a bearing outer ring, and the sealing device.

In order to solve the above problem, an embodiment of the present invention further provides a bearing axial play monitoring device, including:

the aforementioned sealing means;

and the processor is suitable for acquiring the maximum compression variation of the spring within a preset time interval according to the pressure signal, and controlling the alarm unit to alarm when the maximum compression variation is larger than a preset safety threshold.

In order to solve the above problem, an embodiment of the present invention further provides a method for monitoring an axial clearance of a bearing, including:

acquiring a pressure signal by adopting the sealing device;

and acquiring the maximum compression variation of the spring within a preset time interval according to the pressure signal, and controlling an alarm unit to give an alarm when the maximum compression variation is larger than a preset safety threshold.

Compared with the prior art, the technical scheme of the embodiment of the invention has the following advantages:

according to the sealing device provided by the embodiment of the invention, after the sealing device is arranged between the bearing inner ring and the bearing outer ring, the dustproof ring is fixed with the bearing inner ring, the framework is fixed with the bearing outer ring, the support lip fixed on the framework abuts against the radial part of the dustproof ring, and the spring is pre-compressed and abuts against the framework and the support lip. Therefore, when the axial clearance between the bearing inner ring and the bearing outer ring changes, the dustproof ring is fixed with the bearing inner ring, the framework is fixed with the bearing outer ring, the change of the axial clearance between the bearing inner ring and the bearing outer ring is the change of the axial relative distance between the framework and the dustproof ring, the axial two ends of the spring are respectively abutted against the framework and the supporting lip, the supporting lip is abutted against the radial part of the dustproof ring, and the change of the axial relative distance between the framework and the dustproof ring is the change of the compression amount of the spring, therefore, the change of the compression amount of the spring can reflect the change of the axial clearance between the bearing inner ring and the bearing outer ring, the pressure sensor can monitor the pressure of the spring at any time, and the pressure of the spring and the compression amount of the spring have corresponding relation, so that a change in the axial play between the bearing inner ring and the bearing outer ring is obtained on the basis of a change in the pressure of the spring. Therefore, the sealing device provided by the embodiment of the invention has the advantages that the spring is arranged between the dustproof ring and the framework, the pressure sensor is arranged at the end part of the spring, the pressure of the spring can be obtained, the change of the expansion amount of the spring can be obtained based on the pressure of the spring, a foundation is further provided for obtaining the change of the axial clearance of the bearing, the monitoring of the axial clearance of the bearing can be further realized during the operation of the bearing, the probability of impact and bearing damage born by each part of the bearing due to overlarge axial clearance is reduced, the safety of vehicle operation is improved, the structure is simple, and the realization is convenient.

According to the bearing axial clearance monitoring device provided by the embodiment of the invention, after the sealing device acquires the pressure signal, the processor can acquire the maximum compression variation of the spring within a preset time interval according to the pressure signal, and when the maximum compression variation is larger than a preset safety threshold, the alarm unit is controlled to give an alarm, so that the bearing axial clearance can be monitored during the operation of the bearing, and the risk that the bearing is subjected to larger impact due to overlarge axial clearance and even an inner ring is possibly separated from the bearing and damaged is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic view of a partial structure of a bearing according to an embodiment of the present invention;

fig. 2 is a flowchart of a bearing axial play monitoring method according to an embodiment of the present invention.

Wherein: 10-a spring; 20-a rigid member; 30-a framework; 40-a dustproof ring; 410-a radial portion; 420-an axial portion; 50-a bearing outer ring; and 60, bearing inner rings.

Detailed Description

As known from the background art, the current bearing monitoring systems cannot monitor the change of the axial play of the bearing.

In order to monitor the change of the axial play during the operation of the bearing, the embodiment of the invention provides a sealing device, after the sealing device is installed between a bearing inner ring and a bearing outer ring, a dustproof ring is fixed with the bearing inner ring, a framework is fixed with the bearing outer ring, a support lip fixed on the framework abuts against a radial part of the dustproof ring, and a spring is pre-compressed and abuts against the framework and the support lip. Therefore, when the axial clearance between the bearing inner ring and the bearing outer ring changes, the dustproof ring is fixed with the bearing inner ring, the framework is fixed with the bearing outer ring, the change of the axial clearance between the bearing inner ring and the bearing outer ring is the change of the axial relative distance between the framework and the dustproof ring, the axial two ends of the spring are respectively abutted against the framework and the supporting lip, the supporting lip is abutted against the radial part of the dustproof ring, and the change of the axial relative distance between the framework and the dustproof ring is the change of the compression amount of the spring, therefore, the change of the compression amount of the spring can reflect the change of the axial clearance between the bearing inner ring and the bearing outer ring, the pressure sensor can monitor the pressure of the spring at any time, and the pressure of the spring and the compression amount of the spring have corresponding relation, so that a change in the axial play between the bearing inner ring and the bearing outer ring is obtained on the basis of a change in the pressure of the spring. Therefore, the sealing device provided by the embodiment of the invention has the advantages that the spring is arranged between the dustproof ring and the framework, the pressure sensor is arranged at the end part of the spring, the pressure of the spring can be obtained, the change of the expansion amount of the spring can be obtained based on the pressure of the spring, a foundation is further provided for obtaining the change of the axial clearance of the bearing, the monitoring of the axial clearance of the bearing can be further realized during the operation of the bearing, the probability of impact and bearing damage born by each part of the bearing due to overlarge axial clearance is reduced, the safety of vehicle operation is improved, the structure is simple, and the realization is convenient.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the indication of the direction or the positional relationship referred to in the present specification is based on the direction or the positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and it is not intended to indicate or imply that the indicated device must have a specific direction, be configured in a specific direction, and thus, should not be construed as limiting the present invention.

Referring to fig. 1, fig. 1 is a schematic partial structure diagram of a bearing according to an embodiment of the present invention.

As shown in fig. 1, a sealing device according to an embodiment of the present invention includes:

a dust ring 40 adapted to be fixed to a bearing inner race 60 of the bearing;

the framework 30 is of an annular structure and is suitable for being fixed with a bearing outer ring 50 of the bearing, and a support lip is fixed on the framework 30 and is suitable for abutting against the radial part 410 of the dust-proof ring 40;

the spring 10 is arranged between the framework 30 and the supporting lip, after the sealing device is arranged between the bearing inner ring 60 and the bearing outer ring 50, the spring 10 is in a compressed state, two ends of the spring 10 are respectively abutted against the framework 30 and the supporting lip, and the axis of the spring 10 is parallel to the axis of the framework 30;

and the pressure sensor is arranged at the axial end part of the spring 10, which is contacted with the framework 30, or the axial end part of the spring, which is contacted with the supporting lip, and is suitable for monitoring the pressure of the spring 10 to obtain a pressure signal.

The axis of the spring is parallel to the axis of the framework, namely the two axial ends of the spring are respectively abutted to the framework and the back of the supporting lip, and the two axial ends of the spring are at the same height so as to avoid measurement errors caused by the inclination of the spring.

In a specific embodiment, for ease of installation, a pressure sensor may be provided at the axial end of the spring 10 that contacts the armature 30.

In order to improve the accuracy of the measurement, in a particular embodiment, the number of springs 10 may be at least two, each of said springs being evenly distributed along the circumference of said sealing device. Through increasing the quantity of spring, can avoid the measured data deviation that the local slope of bearing caused, improve the accuracy that bearing axial play measured.

The support lip mainly used supports the spring, through with the spring butt in skeleton and support lip, supports the lip butt in the dust ring, when the dust ring rotated with supporting the lip relatively, the spring was static relatively with skeleton and support lip. The supporting lips can be of block-shaped structures, the number of the supporting lips corresponds to the number of the springs, and the supporting lips are only arranged at the positions where the springs abut and are arranged at intervals along the circumferential direction of the sealing device; the support lip may also be of annular configuration, thereby acting not only as a support spring but also as a seal.

The dustproof ring can be fixed in the bearing inner ring in an interference fit mode with the bearing inner ring, and similarly, the framework can be fixed in the bearing outer ring in an interference fit mode with the bearing outer ring. Of course, in other embodiments, the fixing manner is not limited, and the fixing may be realized by clamping or the like.

According to the sealing device provided by the embodiment of the invention, after the sealing device is arranged between the bearing inner ring and the bearing outer ring, the dustproof ring is fixed with the bearing inner ring, the framework is fixed with the bearing outer ring, the support lip fixed on the framework abuts against the radial part of the dustproof ring, and the spring is pre-compressed and abuts against the framework and the support lip. Therefore, when the axial clearance between the bearing inner ring and the bearing outer ring changes, the dustproof ring is fixed with the bearing inner ring, the framework is fixed with the bearing outer ring, the change of the axial clearance between the bearing inner ring and the bearing outer ring is the change of the axial relative distance between the framework and the dustproof ring, the axial two ends of the spring are respectively abutted against the framework and the supporting lip, the supporting lip is abutted against the radial part of the dustproof ring, and the change of the axial relative distance between the framework and the dustproof ring is the change of the compression amount of the spring, therefore, the change of the compression amount of the spring can reflect the change of the axial clearance between the bearing inner ring and the bearing outer ring, the pressure sensor can monitor the pressure of the spring at any time, and the pressure of the spring and the compression amount of the spring have corresponding relation, so that a change in the axial play between the bearing inner ring and the bearing outer ring is obtained on the basis of a change in the pressure of the spring. Therefore, the sealing device provided by the embodiment of the invention has the advantages that the spring is arranged between the dustproof ring and the framework, the pressure sensor is arranged at the end part of the spring, the pressure of the spring can be obtained, the change of the expansion amount of the spring can be obtained based on the pressure of the spring, a foundation is further provided for obtaining the change of the axial clearance of the bearing, the monitoring of the axial clearance of the bearing can be further realized during the operation of the bearing, the probability of impact and bearing damage born by each part of the bearing due to overlarge axial clearance is reduced, the safety of vehicle operation is improved, the structure is simple, and the realization is convenient.

In a specific embodiment, in order to improve the firmness of the installation of the spring 10 and to improve the accuracy of the measurement, the sealing device may further comprise: a rigid member 20, said rigid member 20 being fixed to said support lip, said spring 10 abutting or being fixed to said rigid member 20 abutting said support lip.

The rigid member 20 may be made of any material having rigidity higher than that of an elastic body such as rubber, such as steel, plastic, graphite, etc., and the spring 10 abuts against the surface of the rigid member 20, so that the rigidity of the rigid member 20 is higher than that of the spring 10 abutting against the support lip directly, thereby improving the mounting stability of the spring 10 and the measurement accuracy. The spring may also be fixed to the surface of the rigid member, and the spring may be fixed to the rigid member by bonding or welding.

The support lip may be provided with mounting holes, and the rigid member 20 is fixed to the support lip by being inserted into the mounting holes of the support lip. The rigid part is fixed by arranging the mounting hole on the supporting lip, and the process is simple. In other embodiments, the rigid member 20 may be fixed to the support lip by other means, for example, the rigid member 20 may be vulcanized directly to the support lip, or the rigid member 20 may be adhered to the support lip.

In one embodiment, in order to prevent the end of the spring 10 from moving and further improve the installation stability of the spring 10, at least one of the rigid member 20 and the frame 30 is provided with a positioning groove, and the axial end of the spring 10 abuts against the rigid member 20 or/and the frame 30 by abutting against the positioning groove.

The fixing of the spring is realized in a mode of arranging the positioning groove, the process is simple, the cross section of the positioning groove can be circular, and therefore the cross section of the positioning groove can be matched with the cross section of the spring, and the fixing firmness of the spring is improved. Of course, the cross section of the positioning groove can be in other shapes as long as the fixation of the spring can be realized.

Specifically, the rigid member 20 may be formed with a first positioning groove, and the first axial end of the spring 10 abuts against the rigid member 20 through the first positioning groove.

Similarly, a second positioning groove may be formed in the frame 30, and the axial second end of the spring 10 is abutted against the second positioning groove and the frame 30.

Of course, in order to improve the installation stability of the spring 10, a first positioning groove may be formed on the rigid member 20, and a second positioning groove may be formed on the framework 30, wherein an axial first end of the spring 10 abuts against the first positioning groove, and an axial second end of the spring 10 abuts against the second positioning groove.

In one embodiment, the rigid member 20 may be a carbon plate. When the rigid part is a carbon plate, in the running process of the bearing, if a potential difference exists between the inner ring and the outer ring, the potential difference can be eliminated by transferring charges through the carbon plate, so that a conductive loop can be formed between the outer ring, the framework, the spring, the carbon plate, the dustproof ring and the inner ring, the electro-corrosion phenomenon between the inner ring and the outer ring of the bearing and a rolling body can be avoided, the local melting and the concave-convex phenomenon on the surface of a bearing raceway are further avoided, the wavy abrasion is formed, and the service life of the bearing is prolonged.

As shown in fig. 1, in order to improve the sealing performance of the sealing device, the sealing device may further include a dust seal lip fixed to the frame 30 and abutting against the axial portion 420 of the dust ring 40, the dust seal lip being located inside the support lip.

In order to further reduce the electric corrosion phenomenon, the material of the dust-proof sealing lip is conductive rubber. In the operation process of the bearing, if the potential difference exists between the inner ring and the outer ring, the potential difference can be eliminated by transferring charges through the dustproof sealing lip, so that a conductive loop can be formed among the outer ring, the framework, the dustproof sealing lip and the inner ring, the phenomenon of electric corrosion on the surface of the raceway is avoided, the surface of the raceway is prevented from being locally fused and concave-convex, wavy abrasion is formed, and the service life of the bearing is prolonged.

In order to solve the above problem, an embodiment of the present invention further provides a bearing, which includes a bearing inner ring, a bearing outer ring, and the sealing device.

The dustproof ring 40 of the sealing device is fixed with the bearing inner ring 60 of the bearing;

a framework 30 of the sealing device is fixed with a bearing outer ring 50 of the bearing, a support lip is fixed on the framework 30, and the support lip is abutted against a radial part 410 of the dust-proof ring 40;

the spring 10 is in a compressed state, two ends of the spring 10 are respectively abutted against the framework 30 and the supporting lip, and the axis of the spring 10 is parallel to the axis of the framework 30;

and the pressure sensor is arranged at the axial end part of the spring 10, which is contacted with the framework 30, or the axial end part of the spring, which is contacted with the supporting lip, and is suitable for monitoring the pressure of the spring 10 to obtain a pressure signal.

When the axial clearance between the bearing inner ring and the bearing outer ring changes, the dustproof ring is fixed with the bearing inner ring, the framework is fixed with the bearing outer ring, the change of the axial clearance between the bearing inner ring and the bearing outer ring is the change of the axial relative distance between the framework and the dustproof ring, the axial two ends of the spring are respectively abutted against the framework and the support lip, the support lip is abutted against the radial part of the dustproof ring, and the change of the axial relative distance between the framework and the dustproof ring is the change of the compression amount of the spring, therefore, the change of the compression amount of the spring can reflect the change of the axial clearance between the bearing inner ring and the bearing outer ring, the pressure sensor can monitor the pressure of the spring at any time, and the pressure of the spring and the compression amount of the spring have corresponding relation, so that a change in the axial play between the bearing inner ring and the bearing outer ring is obtained on the basis of a change in the pressure of the spring. Therefore, according to the bearing provided by the embodiment of the invention, the spring is arranged between the dustproof ring and the framework, the pressure sensor is arranged at the end part of the spring, the pressure of the spring can be obtained, the change of the expansion amount of the spring can be obtained based on the pressure of the spring, a foundation is provided for further obtaining the change of the axial clearance of the bearing, the monitoring of the axial clearance of the bearing can be further realized during the operation of the bearing, the probability of impact and bearing damage born by parts of the bearing due to overlarge axial clearance is reduced, the safety of vehicle operation is improved, the structure is simple, and the realization is convenient.

In order to solve the above problem, an embodiment of the present invention further provides a bearing axial play monitoring device, including:

the aforementioned sealing means;

and the processor is suitable for acquiring the maximum compression variation of the spring within a preset time interval according to the pressure signal, and controlling the alarm unit to alarm when the maximum compression variation is larger than a preset safety threshold.

The pressure signal measured by the pressure sensor may be transmitted to the processor by wire or without wire.

The processor can acquire the maximum compression variation of the spring in the preset time interval according to the pressure signal, specifically, the processor can acquire the maximum compression and the minimum compression of the spring in the preset time interval according to the pressure signal, calculate the difference between the maximum compression and the minimum compression, finally obtain the maximum compression variation, and when the maximum compression variation is greater than a preset safety threshold, control the alarm unit to give an alarm.

In a specific embodiment, the alarm unit can alarm by means of a pop-up frame or a light.

According to the bearing axial clearance monitoring device provided by the embodiment of the invention, after the sealing device acquires the pressure signal, the processor can acquire the maximum compression variation of the spring within a preset time interval according to the pressure signal, and when the maximum compression variation is larger than a preset safety threshold, the alarm unit is controlled to give an alarm, so that the bearing axial clearance can be monitored during the bearing operation, the impact born by each part of the bearing due to overlarge axial clearance and the bearing damage probability are reduced, the vehicle operation safety is improved, the structure is simple, and the realization is convenient.

As shown in fig. 2, to solve the above problem, an embodiment of the present invention further provides a bearing axial play monitoring method, including:

step S1: acquiring a pressure signal;

the pressure signal is acquired using the sealing device described previously.

Step S2: and acquiring the maximum compression variation of the spring within a preset time interval according to the pressure signal.

In the operation process of the bearing, the pressure sensor can measure the pressure of the spring constantly along with the change of the expansion amount of the spring, and the pressure of the spring and the compression amount of the spring have a corresponding relation, so that the maximum compression amount and the minimum compression amount of the spring in a preset time interval can be obtained.

The maximum compression volume with the difference of minimum compression volume is the maximum compression variation volume of spring in the time interval of predetermineeing promptly, because of the dust ring is fixed (e.g. interference fit) with the bearing inner race, the skeleton is fixed (e.g. interference fit) with the bearing outer race, is fixed in the support lip butt on the skeleton in the radial portion of dust ring, the spring be precompression ground butt in the skeleton with support the lip, the maximum value of the change of the flexible volume of spring in the time interval of predetermineeing promptly the maximum variation volume of bearing axial internal clearance.

Step S3: and comparing whether the maximum compression variation is larger than a preset safety threshold value.

Comparing whether the maximum compression variation exceeds a preset safety threshold, and executing a step S4 to control an alarm unit to give an alarm when the maximum compression variation is larger than the preset safety threshold; and when the difference does not exceed the preset safety threshold, the step S1 is circulated to continue to monitor the pressure of the spring and acquire a pressure signal.

According to the bearing axial clearance monitoring method provided by the embodiment of the invention, after the sealing device is arranged between the bearing inner ring and the bearing outer ring, the dustproof ring is in interference fit with the bearing inner ring, the framework is in interference fit with the bearing outer ring, the support lip fixed on the framework abuts against the radial part of the dustproof ring, and the spring is in pre-compression abutting against the framework and the support lip. Therefore, when the axial clearance between the bearing inner ring and the bearing outer ring changes, the dustproof ring is fixed with the bearing inner ring, the framework is fixed with the bearing outer ring, the change of the axial clearance between the bearing inner ring and the bearing outer ring is the change of the axial relative distance between the framework and the dustproof ring, the two axial ends of the spring are respectively abutted against the framework and the support lip, the support lip is abutted against the radial part of the dustproof ring, and the change of the axial relative distance between the framework and the dustproof ring is the change of the compression amount of the spring, so the change of the compression amount of the spring can reflect the change of the axial clearance between the bearing inner ring and the bearing outer ring, the pressure sensor can measure the pressure of the spring at any moment, and the corresponding relation exists between the pressure of the spring and the compression amount of the spring, namely, the pressure sensor can monitor the change of the expansion amount of the spring at any moment, and obtains the maximum compression change amount, when the obtained maximum compression variation exceeds a safety preset value, the alarm unit is controlled to alarm, so that the axial clearance of the bearing can be monitored during the operation of the bearing, the probability of bearing damage and impact born by parts of the bearing due to overlarge axial clearance is reduced, the safety of vehicle operation is improved, and the device is simple in structure and convenient to implement.

Although the embodiments of the present invention have been disclosed, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.