Rolling element for rolling bearing, rolling bearing and bearing assembly

Abstract

The invention relates to a rolling body for a rolling bearing, a rolling bearing and a bearing assembly. The rolling element (100) comprises: a rolling element body (110) having an accommodating space; the wireless power supply module (120) is used for generating electric energy based on the movement of the rolling body (100), the wireless power supply module is arranged in the containing space and fixedly connected with the rolling body (110), and the wireless power supply module comprises at least one piezoelectric ceramic beam (121); and the sensing and measuring module (130) is used for monitoring at least one physical working condition parameter, and the sensing and measuring module (130) is arranged in the accommodating space and is electrically connected with the wireless power supply module (120). The rolling bearing (1) comprises an inner ring (200), an outer ring (300) and at least one rolling body. The bearing assembly comprises at least one rolling bearing and a signal receiving device.

Description

Technical Field

[0001] The present invention relates to the technical field of rolling bearings, in particular the technical field of rolling bearing detection. The present invention specifically relates to a rolling element for a rolling bearing, a rolling bearing and a bearing assembly. Background Art

[0002] In traditional bearing monitoring, sensors are arranged on the outer surface of the bearing seat connected to the bearing or on the housing of the entire equipment containing the bearing, so as to monitor various operating parameters of the bearing during operation, such as load, temperature and vibration. In other words, traditional technology uses the operating condition information close to the bearing to be tested to represent the actual operating condition information of the bearing. For example, in actual monitoring, the change of physical quantities at the bearing seat or the equipment housing can be measured to estimate the operating state of the bearing. However, when the bearing located inside the equipment is far away from the vibration sensor located on the equipment housing or when the rigid connection is poor, the load, temperature and vibration signals measured by the sensor on the housing that are expected to characterize the bearing condition will be greatly attenuated or even invalid. For example, in a planetary reduction device, there is no direct connection between the bearing located on the planetary wheel and the gearbox housing, and it is completely impossible to obtain the true state of the bearing through the operating condition parameters detected on the housing. Suppose you want to install the sensor inside the planetary reduction device, because both the planetary wheel and the planetary carrier are rotating, there is no ideal location to install the sensor. In this case, traditional technology cannot effectively detect the state of the bearing.

[0003] To this end, solutions have emerged that integrate wireless sensor devices into rolling elements, which are intended to directly measure the operating parameters inside the bearing.

[0004] For example, Chinese patent document CN 107542757 A discloses a battery-driven load measurement sensor bearing. However, in this solution, due to the limited energy of the battery, the sensor can only monitor the working condition of the rolling bearing in the short term.

[0005] For another example, Chinese patent document CN 115370664 A discloses a self-powered bearing for piezoelectric ceramic power generation. In this solution, the deformation of the piezoelectric ceramic required to provide electrical energy is achieved by the deformation of the rolling element; in other words, in order for the piezoelectric ceramic to generate electricity, the piezoelectric ceramic material must be forced to deform, otherwise it cannot generate enough electrical energy. However, the rolling element must have sufficient bearing capacity to complete the basic function of bearing the bearing of the bearing rolling element, and the stiffness cannot be designed to be very small to meet the situation of large deformation. Under such design requirements, the electrical energy generated by the piezoelectric ceramic is very small, and it cannot functionally complete the subsequent required measurement and communication tasks. Therefore, for the structure described in this document, whether it is to sacrifice the rolling element stiffness and the overall life of the bearing to allow the piezoelectric ceramic to provide more electrical energy to better meet the measurement requirements, or to sacrifice the power generation capacity to more effectively meet the expected bearing life, it is an irreconcilable contradiction under the requirements of the power generation mechanism. Summary of the invention

[0006] Therefore, an object of the present invention is to provide a rolling bearing monitoring solution, by means of which various operating parameters inside the bearing can be measured during the operation of the bearing.

[0007] According to the first aspect of the present invention, the above-mentioned object is achieved by a rolling element for a rolling bearing. The rolling element comprises: a rolling element body having a receiving space; a wireless power supply module for generating electric energy based on the movement of the rolling element, the wireless power supply module being arranged in the receiving space and fixedly connected to the rolling element body, the wireless power supply module comprising at least one piezoelectric ceramic beam; a sensor measurement module for realizing the monitoring of at least one physical working condition parameter, the sensor measurement module being arranged in the receiving space and electrically connected to the wireless power supply module.

[0008] In some preferred embodiments, the rolling body includes a first cavity and a second cavity which are open in two axial directions respectively, wherein the wireless power supply module is arranged in the first cavity, and the sensing measurement module is arranged in the second cavity, and a connecting channel is provided between the first cavity and the second cavity to accommodate cables to realize electrical connection between the wireless power supply module and the sensing measurement module.

[0009] In some preferred embodiments, the sensing and measuring module includes a sensor for measuring at least one physical operating parameter, a power supply management unit, and a measurement control and transmission unit, wherein the power supply management unit is configured to perform energy management, and the measurement control and transmission unit is used to plan system operation and sleep interval mechanisms to ensure sufficient electrical energy for signal acquisition and storage, communication establishment with a host computer, data transmission, and / or command acceptance and feedback.

[0010] In some preferred embodiments, the wireless power supply module further includes: a metal skeleton, which is arranged on the outer surface of the piezoelectric ceramic beam and extends along the longitudinal direction of the piezoelectric ceramic beam; and / or, the wireless power supply module further includes: a mass block, which is arranged at the longitudinal free end of the piezoelectric ceramic beam.

[0011] In some preferred embodiments, the wireless power supply module also includes a base, wherein the piezoelectric ceramic beams are fixedly mounted on the base in an array form with one longitudinal end each, and the base is fixedly arranged inside the first cavity; and / or the piezoelectric ceramic beams are configured to extend along the axial direction of the rolling body or to extend obliquely to the axial direction of the rolling body.

[0012] In some preferred embodiments, the sensing and measuring module includes a strain load ring, wherein the strain load ring is annular as a whole and includes a fixed section and a measuring section distributed adjacent to each other along the axial direction, wherein the fixed section is constructed with a cylindrical or truncated cone-shaped outer peripheral contour and is fixedly installed in the second cavity by a tight fit, wherein the outer peripheral surface of the measuring section is constructed with a plane distributed along the circumferential direction, the plane extends along the tangential direction of the rolling body, and a strain gauge is arranged on the plane.

[0013] In some preferred embodiments, the sensing and measuring module includes a temperature sensor and / or a MEMS sensor.

[0014] In some preferred embodiments, the power supply management unit of the control and wireless transmission module is configured with a bridge rectifier circuit.

[0015] In some preferred embodiments, the measurement control and wireless transmission unit of the control and wireless transmission module is configured with a Bluetooth subunit.

[0016] In some preferred embodiments, the rolling element further comprises a metal end cover which closes the first cavity at the end of the rolling element body; and / or the rolling element further comprises a non-metal filler which fills and closes the second cavity.

[0017] According to a second aspect of the present invention, the above object is achieved by a rolling bearing comprising: an inner ring, an outer ring, and a rolling body according to the above embodiment, wherein the rolling body is arranged between the inner ring and the outer ring in the radial direction of the rolling bearing.

[0018] According to a third aspect of the present invention, the above object is achieved by a bearing assembly comprising a rolling bearing according to the above embodiment and a signal receiving device, the signal receiving device being located outside the rolling bearing and used to wirelessly receive a signal emitted from a rolling element in the rolling bearing.

[0019] With the help of the embodiments of the present invention, it is possible to measure various working parameters such as load, temperature and vibration during the operation of the rolling bearing; the rolling bearing can realize the self-powering of the internal system required for its own measurement and complete the wireless signal transmission to the outside of the bearing. Specifically, with the help of the composite rolling element with integrated wireless passive measurement function and load-bearing function of the embodiments of the present invention, the following advantages can be achieved: (i) the self-powered composite rolling element can continuously generate electricity for a long time, and can serve for the collection and monitoring of working condition signals for a longer time than the system with integrated battery; (ii) the composite rolling element not only provides the sensing measurement function but also is a part of the bearing itself, directly reflecting the physical working conditions such as the load on the bearing itself, and is not subject to the measurement limitations of the traditional technology due to the complex connection structure between the sensor and the measured bearing; (iii) the self-powered composite rolling element can generate a large amount of electrical energy sufficient to drive the embedded system, and with the help of the embedded system, multiple types of sensors can be integrated and measurement tasks can be planned, thereby greatly improving the measurement capability of the rolling element; (iv) the composite rolling element can realize wireless passive measurement, and a stable and reliable wireless monitoring system can be established through mature communication protocols such as Bluetooth. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Features, advantages, and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0021] Figure 1 is a three-dimensional diagram of a rolling bearing according to an embodiment of the present invention;

[0022] Figure 2 is an axial cross-sectional view of a rolling body according to an embodiment of the present invention;

[0023] Figure 3 Is Figure 2 An exploded view of the rolling element shown;

[0024] Figure 4 Is Figure 2 A schematic diagram of a wireless power supply module in a rolling element is shown;

[0025] Figure 5 Is Figure 4 A side view of a piezoelectric ceramic beam in a wireless power module is shown;

[0026] Figure 6 Is Figure 2 A three-dimensional view of the strain load ring of the sensor measurement module in the rolling element shown;

[0027] Figure 7 Is Figure 6 A partial view of the strain load ring is shown. DETAILED DESCRIPTION

[0028] Figure 1FIG. 2 shows a three-dimensional view of a rolling bearing according to an embodiment of the present invention. Figure 1 As shown, the rolling bearing 10 includes an inner ring 200, an outer ring 300, and rolling elements arranged between the inner ring 200 and the outer ring 300 along the radial direction of the rolling bearing 1. In addition, the rolling bearing 10 also includes a cage (not shown). Here, the rolling element includes one, two or more than two composite rolling elements 100 according to an embodiment of the present invention, which integrate wireless passive measurement function and load-bearing function.

[0029] exist Figure 1 In the illustrated embodiment, two composite rolling elements 100 are arranged in the rolling element of the rolling bearing 10. Here, preferably, the two composite rolling elements 100 or more than two composite rolling elements 100 in other embodiments are evenly distributed along the circumferential direction of the rolling bearing 1, thereby covering more measurement areas, such as load measurement areas. In other embodiments, the rolling bearing 10 uses all composite rolling elements 100, that is, no traditional rolling elements are provided, thereby enabling all-round monitoring of the operating status of the bearing.

[0030] Figure 2 and Figure 3 An axial cross-sectional view and an exploded view of a composite rolling element 100 according to an embodiment of the present invention are respectively shown.

[0031] The rolling element 100 includes a rolling element body 110 , a wireless power supply module 120 and a sensing and measuring module 130 .

[0032] refer to Figure 2 and Figure 3 In this example, the rolling body 110 has the basic structure of a cylindrical roller, especially the outer contour; however, in other embodiments, the rolling body 110 may also have a tapered roller, a drum roller or any other known type of rolling body structure with a determined axis of rotation. It should be noted here that, within the scope of this article, unless otherwise specified, the terms "axial", "radial" and "circumferential direction" all refer to the axis of rotation of the rolling body 100 or the rolling body 110. Specifically, "axial" is the direction of the above-mentioned axis of rotation or the direction parallel to the above-mentioned axis of rotation. "Radial" is a direction perpendicular to the above-mentioned axis of rotation and intersecting with the above-mentioned axis of rotation. "Circumferential direction" is the direction around the above-mentioned axis of rotation.

[0033] Especially refer to Figure 2, the rolling body 110 includes a first cavity 111 and a second cavity 112 which are open in two axial directions. In the present embodiment, the first cavity 111 is constructed as a cylindrical cavity, wherein the center axis of the cylindrical cavity coincides with the axis of rotation of the rolling body 110. In the present embodiment, the second cavity 112 is constructed as a cylindrical cavity, wherein the center axis of the cylindrical cavity coincides with the axis of rotation of the rolling body 110. Here, it can be understood that the degree of hollowness of the first cavity 111 and the second cavity 112 needs to be determined according to bearings of different sizes and their load-bearing capacity.

[0034] The wireless power supply module 120 is arranged in the first cavity 111. The sensing and measuring module 130 is arranged in the second cavity 112. A communication channel (not shown) is provided between the first cavity 111 and the second cavity 112, so that the wireless power supply module 120 and the sensing and measuring module 130 are electrically connected by means of a cable extending in the communication channel.

[0035] refer to Figure 2 and Figure 3 The rolling element 100 further includes a metal end cover 160, which closes the first cavity 111 at the axial end of the rolling element body 110. Here, the first cavity 111 is closed by, for example, welding the metal end cover 160. The second cavity 112 is filled and closed by a non-metal filler, such as a glue filler, and the wireless signal can freely pass through the non-metal filler, thereby meeting the requirements of wireless transmission and reception of signals. Here, a glue stop ring 150 is preferably provided at the opening of the second cavity 112.

[0036] The wireless power supply module 120 includes at least one piezoelectric ceramic beam 121. Figure 3 and by Figure 4 Schematic diagram of a wireless power supply module is shown. In this embodiment, the wireless power supply module 120 includes a plurality of piezoelectric ceramic beams 121 arranged in an array form, and the piezoelectric ceramic beams 121 are configured as cantilever beams.

[0037] In this embodiment, the structure of a single piezoelectric ceramic beam 121 can refer to Figure 5 A schematic side view of a piezoelectric ceramic beam 121 is shown. A mass block 123 is provided at the longitudinal free end of the piezoelectric ceramic beam 121. In addition, a metal skeleton 122 is provided on the outer surface of the piezoelectric ceramic beam 121, and the metal skeleton 122 extends in the longitudinal direction of the piezoelectric ceramic beam 121. See in particular Figure 4 and Figure 5 In the radial direction of the rolling body 100 , a metal skeleton 122 is provided on the radial outer side and the radial inner side of the piezoelectric ceramic beam 121 .

[0038] Here, a plurality of piezoelectric ceramic beams 121 distributed in an array are fixedly mounted at a base 124 with one longitudinal end respectively. The base 124 is fixedly arranged inside the first cavity 111. In this embodiment, the base 124 is in the shape of a circular plate, and the first cavity 111, for example, the bottom of the cavity is configured with a groove matching the contour of the base 124, and the base 124 can be fixed in the groove by tight fit. In this embodiment, see Figure 2 and Figure 3 The piezoelectric ceramic beam 121 is configured to extend along the axial direction of the rolling body 100 . In other embodiments, the piezoelectric ceramic beam can also extend obliquely to the axial direction of the rolling body 100 .

[0039] During the operation of the rolling bearing 1, the piezoelectric ceramic beam 121 generates a large deflection and thus generates a large amount of electrical energy due to the reciprocating revolution of the rolling body 100 around the rotation axis of the rolling bearing 1 and the rotation of the rolling body 100 around the rotation axis. The mass block 123 as a counterweight at the free end can increase the degree of deflection of the piezoelectric ceramic beam 121 when the rolling bearing 1 is in operation, thereby generating a larger amount of electricity. In addition, since the piezoelectric ceramic beam 121 is clamped by the metal skeleton 122, the metal skeleton 122 can be used to maintain the shape of the piezoelectric ceramic and protect the piezoelectric ceramic, while the metal skeleton 122 can also be used to achieve the conductive function. With the help of the base 124, the piezoelectric ceramic beam array can be pre-installed on the base, thereby simplifying the assembly of the rolling body 100. Each piezoelectric ceramic beam 121 has an independent power generation capability, and can output electrical energy when a corresponding rectifier circuit, such as a bridge rectifier circuit, is adapted. In particular, refer to Figure 4 In this embodiment, the piezoelectric ceramic beams 121 are symmetrically distributed and include six groups of piezoelectric ceramic beams 121 (three piezoelectric ceramic beams in each group) arranged along the radius. Here, each group of piezoelectric ceramic beams 121 acts in a similar manner in the rolling body 100, so they can be directly connected in parallel through wires and then connected to an adapted bridge rectifier circuit as a power supply, thereby obtaining a simplified rectifier circuit.

[0040] The sensing and measuring module 130 includes a sensor for measuring at least one physical working condition parameter. In this embodiment, the sensing and measuring module 130 includes a strain load ring 131 , a temperature sensor 132 , and a MEMS sensor 133 .

[0041] The strain load ring 131 is used to measure the load carried by the rolling element 100. The structure of the strain load ring 131 is shown in FIG. Figure 6 The three-dimensional view of the strain load ring 131 shown and the Figure 7 A partial view of the strain load ring 131 is shown. Figure 2 and Figure 6, the strain load ring 131 is made of metal and is annular as a whole. The strain load ring 131 includes a fixed section 1311 and a measuring section 1312 which are adjacent to each other in the axial direction. The fixed section 1311 is constructed with a cylindrical outer peripheral contour and is fixedly installed in the second cavity 112, for example, at the bottom of the second cavity 112 by a tight fit. Here, the glue-filled stop ring 150 can be arranged adjacent to the strain load ring 131 and additionally realize axial stopping of the strain load ring 131. The outer peripheral surface of the measuring section 1312 is constructed with a plane 1313 distributed in the circumferential direction, and the plane 1313 extends along the tangential direction of the rolling body 100. The plane 1313 is formed, for example, by milling. With particular reference to Figure 7 , a strain gauge 1314 is provided on the plane 1313. In some embodiments, the strain gauge can be pasted on the plane 1313. In other embodiments, the strain gauge can be constructed by first coating an insulating layer (such as aluminum oxide) on the plane 1313, and then coating a layer of strain material, and then obtaining the strain gauge by etching or machining. Such a design can facilitate the mass industrial production of standardized stress measurement rings, without the need for inefficient calibration of each strain structure. In addition, in order to achieve electrical connection with the strain gauge 1314, a through hole 1315 is constructed within the range of the plane 1313 to penetrate the radial inner and outer sides of the strain load ring 131.

[0042] The load borne by the rolling element 100 is transmitted to the measuring section 1312 through the fixed section 1311 and the load measurement is realized through the strain gauge 1314 at the platform 1313. In the present embodiment, the outer peripheral contour of the fixed section 1311 is constructed as a cylindrical shape, which is particularly suitable for cylindrical rollers, drum rollers, etc., so as to mainly measure the radial load of the bearing. In other embodiments, for example, when the rolling element adopts a tapered roller, the outer peripheral contour of the fixed section is constructed as a truncated cone, that is, a truncated cone, so that the radial load and axial load of the bearing can be measured; for this purpose, the second cavity of the rolling element body needs to have a correspondingly constructed tapered inner contour. In some embodiments, the area in the measuring section 1312 where the plane 1313 is not provided is constructed to match the outer contour of the fixed section 1311 and also form a tight fit with the inner wall of the second cavity 112.

[0043] The temperature sensor 132 is used to measure the temperature of the rolling element 100. The MEMS sensor (micro-electromechanical system sensor) 133 is used to measure physical parameters related to vibration. A highly integrated and miniaturized standard MEMS sensor can be used here.

[0044] The sensing and measuring module 130 also includes a control and wireless transmission module 140. The control and wireless transmission module 140 is preferably implemented by digital circuits and standardized chips, so that batch stability, system stability, etc. can be guaranteed, and the reliable operation of the sensor system can be guaranteed. From the functional division, the control and wireless transmission module 140 includes a power supply management unit, a measurement control and wireless transmission unit. The power supply management unit is configured for energy management of the power emitted by the piezoelectric ceramic beam array. In this embodiment, the power supply management unit is configured with a bridge rectifier circuit. The measurement control and wireless transmission unit is particularly used to plan the system operation and sleep intermittent mechanism, so that there is enough power to perform regular temperature, vibration, load and other signal collection and storage, communication establishment and data transmission to the host computer, and command reception and feedback. In this embodiment, the measurement control and wireless transmission unit is configured with a CPU (central processing unit). In this embodiment, the measurement control and wireless transmission unit is configured with a Bluetooth subunit. In this embodiment, the high sampling rate and multi-channel in terms of acquisition capability ensure reliable and convenient data acquisition, which can meet the acquisition tasks of vibration, temperature and multi-channel loads corresponding to multiple strain gauges 1314 on the strain load ring 131.

[0045] See especially Figure 2 The temperature sensor 132, MEMS sensor 133 and control and wireless transmission module 140, which are only schematically shown, are arranged at the bottom of the second cavity 112. By filling with non-metallic fillers, such as glue fillers, it is possible to assist in the stable holding of the sensors in the sensing and measuring module 130 and the control and wireless transmission module 140 as a whole.

[0046] In some embodiments according to the present invention, a bearing assembly is provided, which includes: a rolling bearing 1 as described above and a signal receiving device (not shown). The signal receiving device can be a host computer. The signal receiving device is located outside the rolling bearing 1, especially outside the device where the rolling bearing is located. The signal receiving device is used to wirelessly receive a signal emitted from a rolling body 100 located in the rolling bearing 1. For example, the host computer can perform data transmission through a standard communication protocol (such as Bluetooth communication) to obtain and display the monitoring signal externally.

[0047] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the claims of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0048] Reference numerals list

[0049] 1 Rolling bearing

[0050] 100 Rolling elements

[0051] 110 Rolling element body

[0052] 111 First cavity

[0053] 112 Second cavity

[0054] 120 Wireless Power Supply Module

[0055] 121 Piezoelectric ceramic beam

[0056] 122 Metal Frame

[0057] 123 Mass Block

[0058] 124 Base

[0059] 130 sensor measurement module

[0060] 131 Strain Load Ring

[0061] 1311 Fixed segment

[0062] 1312 Measurement section

[0063] 1313 Plane

[0064] 1314 Strain Gauge

[0065] 1315 Through hole

[0066] 132 Temperature Sensor

[0067] 133MEMS Sensor

[0068] 140 Control and wireless transmission module

[0069] 150 Stop ring

[0070] 160 End cap

[0071] 200 Inner Circle

[0072] 300 outer ring

Claims

1. A rolling element (100) for a rolling bearing (1), wherein: The rolling element (100) comprises: A rolling body (110) having a receiving space; A wireless power supply module (120) for generating electric energy based on the movement of the rolling body (100), the wireless power supply module (120) being arranged in the receiving space and fixedly connected to the rolling body (110), the wireless power supply module comprising at least one piezoelectric ceramic beam (121); A sensing and measuring module (130) is used to monitor at least one physical operating condition parameter, wherein the sensing and measuring module (130) is arranged in the receiving space and is electrically connected to the wireless power supply module (120).

2. The rolling element (100) according to claim 1, wherein: The rolling body (110) comprises a first cavity (111) and a second cavity (112) which are open in two axial directions respectively, wherein the wireless power supply module (120) is arranged in the first cavity (111), and the sensor measurement module (130) is arranged in the second cavity (112), and a connecting channel is provided between the first cavity (111) and the second cavity (112) to accommodate a cable to realize the electrical connection.

3. The rolling element (100) according to claim 1, wherein: The sensing and measuring module (130) comprises a sensor (131, 132, 133) for measuring at least one physical working condition parameter, a power supply management unit and a measurement control and transmission unit, wherein the power supply management unit is configured to perform energy management, and the measurement control and transmission unit is used to plan system operation and sleep interval mechanisms to ensure sufficient power for signal acquisition and storage, communication establishment with a host computer, data transmission and / or command acceptance and feedback.

4. The rolling element (100) according to claim 1, wherein: The wireless power supply module (120) further includes: a metal skeleton (122) disposed on the outer surface of the piezoelectric ceramic beam (121) and extending in the longitudinal direction of the piezoelectric ceramic beam (121); and / or A mass block (123) is arranged at a longitudinal free end of the piezoelectric ceramic beam (121).

5. The rolling element (100) according to claim 1, wherein: The wireless power supply module (120) further comprises a base (124), wherein the piezoelectric ceramic beams (121) are arranged in an array and are fixed to the base (124) at one longitudinal end, respectively, and the base (124) is fixedly arranged inside the first cavity (111); and / or The piezoelectric ceramic beam (124) is configured to extend along the axial direction of the rolling body (100) or to extend obliquely to the axial direction of the rolling body (100).

6. The rolling element (100) according to claim 1, wherein: The sensing and measuring module (130) comprises a strain load ring (131), wherein the strain load ring (131) is annular as a whole and comprises a fixing section (1311) and a measuring section (1312) which are adjacently distributed along the axial direction. The fixing section (1311) is configured with a cylindrical or truncated cone outer peripheral profile and is fixedly installed in the second cavity (112) by tight fit. The outer peripheral surface of the measuring section (1312) is constructed with a plane (1313) distributed along the circumferential direction, the plane (1313) extends along the tangential direction of the rolling body (100), and a strain gauge (1314) is arranged on the plane (1313).

7. The rolling element (100) according to claim 1, wherein: The sensing and measuring module (130) includes a temperature sensor (132) and / or a MEMS sensor (133).

8. The rolling element (100) according to claim 1, wherein: The power supply management unit is configured with a bridge rectifier circuit.

9. The rolling element (100) according to claim 1, wherein: The measurement control and wireless transmission unit is configured with a Bluetooth subunit.

10. The rolling element (100) according to claim 1, wherein: The rolling element (100) further comprises a metal end cover (160) which closes the first cavity (111) at the end of the rolling element body (110); and / or The rolling element (100) further comprises a non-metal filler which fills and closes the second cavity (112).

11. A rolling bearing (1), comprising: Inner circle (200); Outer ring (300); and At least one rolling body (100) according to any one of claims 1 to 10, wherein the rolling body (100) is arranged between the inner ring (200) and the outer ring (300) in a radial direction of the rolling bearing (1).

12. A bearing assembly, comprising: At least one rolling bearing (1) according to claim 11; and A signal receiving device is located outside the rolling bearing (1) and is used to wirelessly receive a signal transmitted from a rolling element (100) located inside the rolling bearing (1).

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