Bearing fault mode prediction test bed in near space low-temperature environment

Abstract

The invention relates to the technical field of bearing test equipment, and provides a bearing fault mode prediction test bed in a near space low-temperature environment, which comprises a driving assembly, a test bearing seat and a friction torque measuring device, the driving assembly comprises a rotary driving part and a transmission shaft in transmission connection with the output end of the rotary driving part, a testing hole and a cooling groove are formed in the testing bearing seat, the transmission shaft penetrates through the testing hole, and a mounting space for mounting a tested bearing is formed between the periphery of the transmission shaft and the inner wall of the testing hole; the friction torque measuring device comprises a support, a tension and pressure sensor and a measuring piece, and the measuring piece is connected with the support through the tension and pressure sensor and connected with the axial end face of the test bearing seat. According to the bearing fault mode prediction test bench in the near space low-temperature environment, the cooling tank is arranged to simulate the near space low-temperature environment, and the friction torque measurement device is arranged to measure the friction torque generated by the tested bearing in the low-temperature environment when the transmission shaft rotates.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing testing equipment, and in particular to a bearing failure mode prediction test bench in a near-space low-temperature environment. Background Art

[0002] Rolling bearings are one of the most widely used equipment in the industrial field. Some mechanical equipment needs to operate in extreme environments (such as low-temperature environments in near-space). The probability of bearing failure during the use of these equipment is high, and its failure will cause huge losses to the equipment. Therefore, bearings need to be evaluated for reliability and tested for performance in low-temperature environments. In related technologies, the performance test of bearings in low-temperature environments usually includes testing the operation of bearings under different loads, but lacks the measurement and testing of friction torque during the operation of bearings. Summary of the invention

[0003] The present invention provides a bearing failure mode prediction test bench in a near-space low-temperature environment, which is used to solve the problem that when performing performance tests on bearings in the prior art, there is a lack of measurement and testing of the friction torque of the bearings during operation in the near-space low-temperature environment.

[0004] The present invention provides a bearing failure mode prediction test bench in a near-space low-temperature environment, comprising: A driving assembly, comprising a rotating driving member and a transmission shaft drivingly connected to an output end of the rotating driving member, wherein the transmission shaft is used to pass through the bearing to be tested; A test bearing seat, wherein a test hole and a cooling groove are constructed in the test bearing seat, the transmission shaft is passed through the test hole, and an installation space for installing the tested bearing is formed between the outer periphery of the transmission shaft and the inner wall of the first through hole; both ends of the cooling groove are connected to the outside for passing a coolant pipeline; A friction torque measuring device comprises a bracket, a tension and pressure sensor and a measuring piece; the measuring piece is connected to the bracket through the tension and pressure sensor and is connected to the axial end face of the test bearing seat; the tension and pressure sensor is used to measure the tension / pressure of the measuring piece on the bracket.

[0005] According to a bearing failure mode prediction test bench in a near-space low-temperature environment of the present invention, The measuring member is a measuring ring; An annular protrusion corresponding to the measuring ring is arranged on the axial end surface of the test bearing seat along the circumference of the test hole, and the measuring ring is connected to the annular protrusion.

[0006] According to a bearing failure mode prediction test bench in a near-space low-temperature environment of the present invention, The bracket includes a horizontal adjustment component, a vertical adjustment component and a sensor support; The tension and pressure sensor is arranged on the sensor support; The vertical adjustment assembly includes a vertical slider and a vertical slide rail, the sensor support is arranged on the vertical slider, and the vertical slider is slidably arranged on the vertical slide rail to adjust the height of the sensor support; The horizontal adjustment component includes a horizontal slider and a horizontal slide rail. The vertical slide rail is fixedly connected to the horizontal slider. The horizontal slider is slidably disposed on the horizontal slide rail to adjust the position of the vertical adjustment component in the horizontal direction.

[0007] According to a bearing failure mode prediction test bench in a near-space low-temperature environment of the present invention, Also included is an axial force loading assembly; The axial force loading assembly comprises: an axial force driving member, a loading bearing seat, an axial force transmission mechanism and a locking sleeve; A first through hole is configured in the loading bearing seat, and the axial force transmission mechanism is arranged through the first through hole; the output end of the axial force driving member abuts against one end of the axial force transmission mechanism to apply axial force to the axial force transmission mechanism, and the other end of the axial force transmission mechanism abuts against the end surface of the transmission shaft to transmit the axial force to the transmission shaft; The locking sleeve is fixedly sleeved on the transmission shaft and abuts against the axial end surface of the measured bearing, so as to transmit axial force to the measured bearing.

[0008] According to a bearing failure mode prediction test bench in a near-space low-temperature environment of the present invention, the loaded bearing support includes a seat body and a self-lubricating sleeve, and a mounting through hole adapted to the self-lubricating sleeve is constructed in the seat body, and the self-lubricating sleeve is inserted into the mounting through hole to form the first through hole.

[0009] According to a bearing failure mode prediction test bench in a near-space low-temperature environment of the present invention, the axial force transmission mechanism includes a loading end cover, a thrust roller bearing, a loading sleeve and a CARB bearing that are sequentially abutted along the axial direction; One end of the loading end cover is provided with an axial hole adapted to the output shaft of the axial force driving member, the output shaft of the axial force driving member is inserted into the axial hole, the other end of the loading end cover abuts against the axial end face of the thrust roller bearing, the other axial end face of the thrust roller bearing abuts against the axial end face of the inner ring of the CARB bearing through the loading sleeve, and the other axial end face of the inner ring of the CARB bearing abuts against the end face of the transmission shaft; The transmission shaft includes a first shaft segment, a second shaft segment, a third shaft segment and a fourth shaft segment, the radii of which increase successively and are connected successively. The first shaft segment is located at the outermost end and is inserted in the thrust roller bearing and the loading sleeve; the second shaft segment is inserted in the CARB bearing, and the outer end face of the second shaft segment abuts against the loading sleeve; the third shaft segment is inserted in the locking sleeve, and the outer end face of the third shaft segment abuts against the axial end face of the inner ring of the CARB bearing; the fourth shaft segment is inserted in the bearing to be tested.

[0010] A bearing failure mode prediction test bench in a near-space low-temperature environment according to the present invention also includes a radial force driving member; The output end of the radial force driving member abuts against the outer peripheral surface of the test bearing seat to apply radial force to the test bearing seat.

[0011] According to a bearing failure mode prediction test bench in a near-space low-temperature environment of the present invention, the transmission shaft includes a torque and speed sensor shaft section, a transmission shaft section and two couplings. One end of the torque and speed sensor shaft segment is connected to the output shaft of the rotating drive member through one coupling, and the other end is connected to the transmission shaft segment through another coupling. The transmission shaft segment is inserted into the test hole through the measured bearing.

[0012] According to the present invention, a bearing failure mode prediction test bench in a near-space low-temperature environment also includes a support bearing seat; the support bearing seat is arranged between the rotary drive member and the test bearing seat; The supporting bearing seat is structured with a second through hole, and a double-row tapered roller bearing is arranged in the second through hole; the transmission shaft passes through the double-row tapered roller bearing and is arranged in the second through hole.

[0013] According to a bearing failure mode prediction test bench in a near-space low-temperature environment of the present invention, a water cooling groove is constructed in the support bearing seat for passing cooling water.

[0014] The present invention provides a bearing failure mode prediction test bench in a near-space low-temperature environment. A cooling groove is constructed in a test bearing seat to pass a coolant to lower the temperature of the test bearing seat, thereby simulating the low-temperature environment of near-space, and a rotating drive member is provided to drive a transmission shaft to rotate. The tested bearing is sleeved on the transmission shaft, and the transmission shaft and the tested bearing are jointly inserted into a test hole of the test bearing seat to simulate the actual operating environment of the tested bearing. When the transmission shaft rotates, the tested bearing will exert a friction torque on the inner wall of the test hole, thereby causing a slight deformation of the test bearing seat. By providing a friction torque measuring device, the measuring member of the friction torque measuring device will be displaced or rotated with the deformation of the test bearing seat, thereby generating tension or pressure on the bracket. By measuring the magnitude of the tension or pressure, the friction torque of the tested bearing can be calculated, which effectively solves the problem of lack of measurement and testing of the friction torque of the bearing during operation in the near-space low-temperature environment when testing the bearing performance in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a system diagram of a bearing failure mode prediction test bench in a near-space low-temperature environment provided by an embodiment of the present invention; Figure 2 is a schematic diagram of a test bearing seat provided in an embodiment of the present invention; Figure 3 is a schematic diagram of a friction torque measuring device provided by an embodiment of the present invention; Figure 4 is a schematic diagram of an axial force loading assembly provided by an embodiment of the present invention; Figure 5 It is a schematic diagram of an axial force driving component and a radial force driving component provided in an embodiment of the present invention.

[0017] Reference numerals: 1. A bearing failure mode prediction test bench in near-space cryogenic environment; 2. Tested bearing; 11. driving assembly; 111. rotating driving member; 112. transmission shaft; 1121. torque and speed sensor shaft section; 1122. coupling; 1123. transmission shaft section; 12. Test bearing seat; 121. Test hole; 122. Annular protrusion; 123. Cooling groove; 13. Friction torque measuring device; 131. Bracket; 132. Pressure sensor; 133. Measuring piece; 134. Horizontal adjustment assembly; 1341. Horizontal slider; 1342. Horizontal slide rail; 135. Vertical adjustment assembly; 1351. Vertical slider; 1352. Vertical slide rail; 136. Sensor support; 14. Axial force loading assembly; 141. Axial force driving member; 142. Loading bearing seat; 1421. First through hole; 1422. Seat body; 1423. Self-lubricating sleeve; 143. Axial force transmission mechanism; 1431. Loading end cover; 1432. Thrust roller bearing; 1433. Loading sleeve; 1434. CARB bearing; 15. Radial force driving member; 16. Support bearing seat. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the description of the embodiments of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] Combine the following Figure 1-5 The present invention describes a bearing failure mode prediction test bench in a near-space low-temperature environment.

[0022] like Figure 1 , Figure 2 and Figure 3 As shown, a bearing failure mode prediction test bench 1 in a near-space low-temperature environment of the present invention comprises: a drive assembly 11, a test bearing seat 12 and a friction torque measuring device 13; the drive assembly 11 comprises a rotating drive member 111 and a transmission shaft 112 which is transmission-connected to the output end of the rotating drive member 111; a test hole 121 and a cooling groove 123 are constructed in the test bearing seat 12, the transmission shaft 112 is passed through the test hole 121, and an installation space for installing a tested bearing is formed between the outer periphery of the transmission shaft 112 and the inner wall of the test hole 121; both ends of the cooling groove 123 are connected to the outside for passing a coolant pipeline; the friction torque measuring device 13 comprises a bracket 131, a tension and pressure sensor 132 and a measuring piece 133, the measuring piece 133 is connected to the bracket 131 through the tension and pressure sensor 132, and is connected to the axial end face of the test bearing seat 12; the tension and pressure sensor 132 is used to measure the tension / pressure of the measuring piece 133 on the bracket 131.

[0023] In the present embodiment, a bearing failure mode prediction test bench 1 in a near-space low-temperature environment is used to simulate the operation of the tested bearing 2 and possible failures. Specifically, the rotating drive member 111 is used to drive the transmission shaft 112 to rotate around the axial direction, and the transmission shaft 112 is passed through the tested bearing 2 to serve as a test shaft for testing the tested bearing 2; by constructing a cooling groove 123 in the test bearing seat 12 to pass a coolant pipeline, so that the coolant can pass through the cooling groove 123, and the cooling groove 123 is used to cool the test bearing seat 12 and the tested bearing 2, so that the bearing failure mode prediction test bench 1 in a near-space low-temperature environment can simulate a low-temperature environment similar to that of near-space, and test the operation of the tested bearing 2 in the low-temperature environment; the test hole 121 of the test bearing seat 12 is used to pass and support the transmission shaft 112 and the tested bearing 2, and at the same time, the outer peripheral surface of the tested bearing 2 It will contact the inner wall of the test hole 121. When the transmission shaft 112 rotates, the tested bearing 2 will generate a friction torque on the inner wall of the test hole 121, and the friction torque will cause the test bearing seat 12 to produce a slight deformation along the circumference of the transmission shaft 112; by connecting the measuring piece 133 to the bracket 131 and the test bearing seat 12 respectively, when the test bearing seat 12 is deformed, it will also pull the measuring piece 133, causing the measuring piece 133 to be slightly displaced or rotated, thereby generating tension or pressure on the bracket 131; by setting a tension and pressure sensor 132 between the bracket 131 and the measuring piece 133, the tension or pressure of the measuring piece 133 on the bracket 131 can be measured, and the friction torque of the tested bearing 2 can be calculated based on the tension or pressure.

[0024] The present invention provides a bearing failure mode prediction test bench 1 in a near-space low-temperature environment. A cooling groove 123 is constructed in a test bearing seat 12 to allow coolant to be introduced to reduce the temperature of the test bearing seat 12, thereby simulating the low-temperature environment of near-space. A rotating drive member 111 is provided to drive a transmission shaft 112 to rotate. A tested bearing 2 is sleeved on the transmission shaft 112. The transmission shaft 112 and the tested bearing 2 are jointly inserted into a test hole 121 of the test bearing seat 12 to simulate the actual operating environment of the tested bearing 2. When the transmission shaft 112 rotates, the tested bearing 2 It will generate friction torque on the inner wall of the test hole 121, thereby causing a slight deformation of the test bearing seat 12; by setting up a friction torque measuring device 13, the measuring piece 133 of the friction torque measuring device 13 will be displaced or rotated with the deformation of the test bearing seat 12, thereby generating tension or pressure on the bracket 131. By measuring the magnitude of the tension or pressure, the friction torque of the tested bearing 2 can be calculated, which effectively solves the problem of lack of measurement and testing of the friction torque of the bearing during operation in the low-temperature environment of near space when testing the bearing performance in the prior art.

[0025] Alternatively, liquid nitrogen may be used as the coolant.

[0026] Specifically, the rotating driving member 111 is a driving motor, and the output shaft of the driving motor is drivingly connected to the transmission shaft 112 .

[0027] Specifically, in some embodiments, Figure 3 As shown, the measuring piece 133 is a measuring ring; an annular protrusion 122 corresponding to the measuring ring is arranged on the axial end face of the test bearing seat 12 along the circumference of the test hole 121 , and the measuring ring is connected to the annular protrusion 122 .

[0028] In this embodiment, since the tested bearing 2 will generate a friction torque on the inner wall of the test hole 121 when the transmission shaft 112 rotates, the friction torque will cause the test bearing seat 12 to produce a slight deformation along the circumference of the transmission shaft 112. By arranging an annular protrusion 122 axially on the axial end face of the test bearing seat 12, the annular protrusion 122 can also produce a slight rotation with the deformation of the test bearing seat 12, and the measuring ring on the annular protrusion 122 also rotates accordingly. The rotation direction of the measuring ring is the same as the direction of action of the friction torque, which is beneficial to increase the measurement sensitivity.

[0029] In a specific embodiment, Figure 3 As shown, cantilever beams extending radially outward are provided on both sides of the measuring ring, and both sides of the two cantilever beams are connected to the bracket 131 through the tension and pressure sensors 132 .

[0030] In some embodiments, Figure 3As shown, the bracket 131 includes a horizontal adjustment component 134, a vertical adjustment component 135 and a sensor support 136; the tension and pressure sensor 132 is arranged on the sensor support 136; the vertical adjustment component 135 includes a vertical slider 1351 and a vertical slide rail 1352, the sensor support 136 is arranged on the vertical slider 1351, and the vertical slider 1351 can be slidably arranged on the vertical slide rail 1352 to adjust the height of the sensor support 136; the horizontal adjustment component 134 includes a horizontal slider 1341 and a horizontal slide rail 1342, the vertical slide rail 1352 is fixedly connected to the horizontal slider 1341, and the horizontal slider 1341 can be slidably arranged on the horizontal slide rail 1342 to adjust the position of the vertical adjustment component 135 along the horizontal direction.

[0031] In this embodiment, due to the different sizes and specifications of the tested bearing 2, it is usually necessary to replace the test bearing seat 12 of different sizes, and the connection position of the measuring piece 133 will also change; by setting the tension and pressure sensor 132 on the sensor support 136, and setting the sensor support 136 on the vertical slider 1351, and sliding the vertical slider 1351 along the vertical slide rail 1352, the height of the sensor support 136 can be adjusted, thereby adjusting the height of the tension and pressure sensor 132 and the measuring piece 133; similarly, by setting the vertical slide rail 1352 on the horizontal slider 1341, and sliding the horizontal slider 1341 along the horizontal slide rail 1342, the horizontal position of the vertical adjustment component 135 and the various components arranged on the vertical adjustment component 135 can be adjusted, thereby adjusting the horizontal position of the pressure sensor 132 and the measuring piece 133, so that the measuring piece 133 can be suitable for test bearing seats 12 of different specifications and models, with a simple structure and convenient and practical use.

[0032] In some embodiments, a bearing failure mode prediction test bench 1 in a near-space low-temperature environment also includes a loading device, which is used to abut against the end face or outer peripheral surface of the test bearing seat 12 and / or the tested bearing 2, and apply axial force and / or radial force to the tested bearing 2 to test the operation of the tested bearing 2 under different loads.

[0033] In some embodiments, Figure 1 and Figure 4As shown, a bearing failure mode prediction test bench 1 in a near-space low-temperature environment also includes an axial force loading component 14: the axial force loading component 14 includes: an axial force driving member 141, a loading bearing seat 142, an axial force transmission mechanism 143 and a locking sleeve (not shown in the figure); a first through hole 1421 is constructed in the loading bearing seat 142, and the axial force transmission mechanism 143 is penetrated by the first through hole 1421; the output end of the axial force driving member 141 abuts against one end of the axial force transmission mechanism 143 to apply axial force to the axial force transmission mechanism 143, and the other end of the axial force transmission mechanism 143 abuts against the end face of the transmission shaft 112 to transmit the axial force to the transmission shaft 112; the locking sleeve is fixedly sleeved on the transmission shaft 112, and abuts against the axial end face of the bearing 2 to be tested, and is used to transmit the axial force to the bearing 2 to be tested.

[0034] In this embodiment, the axial force loading assembly 14 is used to apply axial force to the measured bearing 2; an axial force driving member 141 is provided as a power source for the axial force; the axial force applied by the axial force driving member 141 is applied to the end face of the transmission shaft 112 through the axial force transmission mechanism 143, and the axial force transmission mechanism 143 is penetrated through the first through hole 1421 in the loading bearing seat 142, and the loading bearing seat 142 can offset the radial force exerted on the axial force transmission mechanism 143, so that the axial force is only applied to the end face of the transmission shaft 112, and the application direction of the axial load is more accurate; at the same time, a locking sleeve is provided on the outer surface of the transmission shaft 112, and the locking sleeve can apply the axial load exerted on the transmission shaft 112 to the measured bearing 2, so that the position of the axial load on the measured bearing 2 is more accurate.

[0035] Optionally, a water cooling groove is constructed in the loading bearing seat 142 so as to be connected to a water cooling device to reduce the working temperature of the loading bearing seat 142 and extend the service life of various components in the loading bearing seat 142.

[0036] Specifically, Figure 5 As shown, the axial force driving component 141 can be an axial load-loading electric cylinder, the shaft end of which is equipped with a spoke-type force sensor and a force indicator. The driver of the servo motor in the axial load-loading electric cylinder and the force indicator are both communicatively connected to the control terminal (host computer) to monitor and control the axial load in real time.

[0037] Specifically, in some embodiments, Figure 4 As shown, the loading bearing seat 142 includes a seat body 1422 and a self-lubricating sleeve 1423 . A mounting through hole adapted to the self-lubricating sleeve 1423 is configured in the seat body 1422 . The self-lubricating sleeve 1423 is penetrated in the mounting through hole to form a first through hole 1421 .

[0038] In this embodiment, the seat body 1422 is used to support the structure of the entire loading bearing seat 142. A self-lubricating sleeve 1423 is arranged in the mounting hole of the seat body 1422 to form a first through hole 1421 and an axial force transmission mechanism 143 is arranged, so that the axial force transmission mechanism 143 is in contact with the self-lubricating sleeve 1423. The self-lubricating sleeve 1423 can form a lubricating film on the surface through the internal solid lubricant, thereby reducing the friction between the self-lubricating sleeve 1423 and the axial force transmission mechanism 143, thereby reducing the loss of axial force, and can reduce the wear between the axial force transmission mechanism 143 and the self-lubricating sleeve 1423, so as to extend the service life.

[0039] Specifically, the self-lubricating sleeve 1423 may be a self-lubricating graphite copper sleeve.

[0040] Specifically, in some embodiments, Figure 4 As shown, the axial force transmission mechanism 143 includes a loading end cover 1431, a thrust roller bearing 1432, a loading sleeve 1433 and a CARB bearing 1434 which are sequentially abutted along the axial direction; one end of the loading end cover 1431 is provided with an axial hole adapted to the output shaft of the axial force driving member 141, and the output shaft of the axial force driving member 141 is inserted into the axial hole, and the other end of the loading end cover 1431 abuts against the axial end face of the thrust roller bearing 1432, and the other axial end face of the thrust roller bearing 1432 is connected to the CARB bearing 1434 through the loading sleeve 1433. The axial end face of the inner ring of 434 abuts against the axial end face; the transmission shaft 112 includes a first shaft section, a second shaft section, a third shaft section and a fourth shaft section with radii increasing successively and connected successively, the first shaft section is located at the outermost end, and is inserted in the thrust roller bearing 1432 and the loading sleeve 1433; the second shaft section is inserted in the CARB bearing 1434, and the outer end face of the second shaft section abuts against the loading sleeve 1433; the third shaft section is inserted in the locking sleeve, and the outer end face of the third shaft section abuts against the axial end face of the inner ring of the CARB bearing 1434; the fourth shaft section is inserted in the measured bearing 2.

[0041] In this embodiment, by setting one end of the transmission shaft 112 as a stepped shaft section, different shaft sections are respectively inserted into the thrust roller bearing 1432, the loading sleeve 1433, and the CARB bearing 1434 (CARB, Compact Aligning Roller Bearing, compact aligning bearing). When the transmission shaft 112 rotates, the thrust roller bearing 1432 can effectively reduce the friction between the axial force transmission mechanism 143 and the transmission shaft 112 along the circumferential direction of the transmission shaft 112, and at the same time can transmit the axial force to the loading sleeve 1433 and the CARB bearing 1434. The loading sleeve 1433 abuts against the outer end surface of the second shaft section to transmit part of the axial force; the circumferential end surface of the inner ring of the CARB bearing 1434 abuts against the outer end surface of the third shaft section to transmit part of the axial force. At the same time, the CARB bearing 1434 has an inner ring aligning function, which can prevent eccentricity and ensure the direction of the axial load.

[0042] In some embodiments, Figure 1 and Figure 5 As shown, a bearing failure mode prediction test bench 1 in a near-space low-temperature environment also includes a radial force driver 15; the output end of the radial force driver 15 abuts against the outer peripheral surface of the test bearing seat 12 to apply radial force to the test bearing seat 12.

[0043] In this embodiment, the radial force driving member 15 is used to apply radial force to the test bearing seat 12, thereby applying a radial load to the tested bearing 2, so as to test the operation of the tested bearing 2 under the action of different radial loads.

[0044] Specifically, Figure 5 As shown, the radial force driving component 15 can be a longitudinal load loading electric cylinder, the shaft end of the longitudinal load loading electric cylinder is equipped with a spoke force sensor and a force display instrument, and the driver of the servo motor in the longitudinal load loading electric cylinder and the force display instrument are both communicated with the control terminal (host computer) to monitor and control the radial load in real time.

[0045] In some embodiments, Figure 1 As shown, the transmission shaft 112 includes a torque and speed sensor shaft section 1121, a transmission shaft section 1123 and two couplings 1122; one end of the torque and speed sensor shaft section 1121 is connected to the output shaft of the rotating drive member 111 through a coupling 1122, and the other end is connected to the transmission shaft section 1123 through another coupling 1122, and the transmission shaft section 1123 is inserted into the test hole 121 through the tested bearing 2.

[0046] In this embodiment, a torque and speed sensor shaft section 1121 is provided in the transmission shaft 112 to detect the torque exerted on the transmission shaft 112 and the speed of the transmission shaft 112, so as to monitor and adjust the test conditions, and the transmission shaft section 1123 is used to pass through the test bearing 2 and be arranged in the test hole 121, so as to rotate in the test bearing 2 for testing; at the same time, the output shaft of the rotating drive member 111 and the torque and speed sensor shaft section 1121, the torque and speed sensor shaft section 1121 and the transmission shaft section 1123 are all connected by a coupling 1122, so as to facilitate the disassembly, assembly and replacement of a single shaft section, and also facilitate the replacement of each bearing.

[0047] Optionally, the coupling 1122 may be a plum blossom elastic coupling.

[0048] In some embodiments, Figure 1 As shown, a bearing failure mode prediction test bench 1 in a near-space low-temperature environment also includes a support bearing seat 16; the support bearing seat 16 is arranged between the rotating drive member 111 and the test bearing seat 12; the support bearing seat 16 is constructed with a second through hole, and the second through hole is provided with a double-row tapered roller bearing; the transmission shaft 112 is passed through the second through hole through the double-row tapered roller bearing.

[0049] In this embodiment, a second through hole is constructed in the support bearing seat 16 between the rotating drive member 111 and the test bearing seat 12, and a double-row tapered roller bearing is provided in the second through hole to support the transmission shaft 112 and maintain the horizontality of the transmission shaft 112. At the same time, the double-row tapered roller bearing can offset the radial force and axial force transmitted from the transmission shaft 112, thereby protecting the output shaft of the rotating drive member 111.

[0050] Specifically, an interference fit can be used between the double-row tapered roller bearing and the second through hole to eliminate the original clearance, and the bearing body and the inner and outer rings can be elastically deformed, thereby preventing relative movement between the inner and outer rings during operation.

[0051] Optionally, a water cooling groove is constructed in the support bearing seat 16 for passing cooling water to reduce the working temperature of the support bearing seat 16 and extend the service life of the double-row tapered roller bearing.

[0052] Optionally, in some embodiments, there are multiple support bearing seats 16 , which are arranged along the axial direction of the transmission shaft 112 to support the transmission shaft 112 at multiple points to maintain the horizontality of the transmission shaft 112 .

[0053] Specifically, in some embodiments, a bearing failure mode prediction test bench 1 in a near-space low-temperature environment also includes a base, and a rotating drive component 111, a test bearing seat 12, a friction torque measuring device 13, an axial force drive component 141, a loading bearing seat 142, a radial force drive component 15 and a support bearing seat 16 are all fixedly installed on the base to support and fix each component.

[0054] The above described embodiments are merely illustrative, and some or all of the modules may be selected according to actual needs to achieve the purpose of the embodiments. Those skilled in the art may understand and implement the embodiments without creative effort.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bearing failure mode prediction test bench in a near-space low-temperature environment, characterized in that: include: A driving assembly, comprising a rotating driving member and a driving shaft drivingly connected to an output end of the rotating driving member; A test bearing seat, wherein a test hole and a cooling groove are constructed in the test bearing seat, the transmission shaft is passed through the test hole, and an installation space for installing the tested bearing is formed between the outer periphery of the transmission shaft and the inner wall of the test hole; both ends of the cooling groove are connected to the outside for passing a coolant pipeline; A friction torque measuring device comprises a bracket, a tension and pressure sensor and a measuring piece; the measuring piece is connected to the bracket through the tension and pressure sensor and is connected to the axial end face of the test bearing seat; the tension and pressure sensor is used to measure the tension and pressure of the measuring piece on the bracket.

2. The bearing failure mode prediction test bench in near-space low temperature environment according to claim 1 is characterized in that: The measuring member is a measuring ring; An annular protrusion corresponding to the measuring ring is arranged on the axial end surface of the test bearing seat along the circumference of the test hole, and the measuring ring is connected to the annular protrusion.

3. The bearing failure mode prediction test bench in near-space low temperature environment according to claim 1 is characterized in that: The bracket includes a horizontal adjustment component, a vertical adjustment component and a sensor support; The tension and pressure sensor is arranged on the sensor support; The vertical adjustment assembly includes a vertical slider and a vertical slide rail, the sensor support is arranged on the vertical slider, and the vertical slider is slidably arranged on the vertical slide rail to adjust the height of the sensor support; The horizontal adjustment component includes a horizontal slider and a horizontal slide rail. The vertical slide rail is fixedly connected to the horizontal slider. The horizontal slider is slidably disposed on the horizontal slide rail to adjust the position of the vertical adjustment component in the horizontal direction.

4. The bearing failure mode prediction test bench in near-space low temperature environment according to claim 1 is characterized in that: Also included is an axial force loading assembly; The axial force loading assembly comprises: an axial force driving member, a loading bearing seat, an axial force transmission mechanism and a locking sleeve; A first through hole is configured in the loading bearing seat, and the axial force transmission mechanism is arranged through the first through hole; the output end of the axial force driving member abuts against one end of the axial force transmission mechanism to apply axial force to the axial force transmission mechanism, and the other end of the axial force transmission mechanism abuts against the end surface of the transmission shaft to transmit the axial force to the transmission shaft; The locking sleeve is fixedly sleeved on the transmission shaft and abuts against the axial end surface of the measured bearing, so as to transmit axial force to the measured bearing.

5. The bearing failure mode prediction test bench in near-space low temperature environment according to claim 4 is characterized in that: The loading bearing support includes a seat body and a self-lubricating sleeve. A mounting through hole adapted to the self-lubricating sleeve is configured in the seat body. The self-lubricating sleeve is penetrated in the mounting through hole to form the first through hole.

6. The bearing failure mode prediction test bench in near-space low temperature environment according to claim 4 is characterized in that: The axial force transmission mechanism comprises a loading end cover, a thrust roller bearing, a loading sleeve and a CARB bearing which are abutted in sequence along the axial direction; One end of the loading end cover is provided with an axial hole adapted to the output shaft of the axial force driving member, the output shaft of the axial force driving member is inserted into the axial hole, the other end of the loading end cover abuts against the axial end face of the thrust roller bearing, the other axial end face of the thrust roller bearing abuts against the axial end face of the inner ring of the CARB bearing through the loading sleeve, and the other axial end face of the inner ring of the CARB bearing abuts against the end face of the transmission shaft; The transmission shaft includes a first shaft segment, a second shaft segment, a third shaft segment and a fourth shaft segment, the radii of which increase successively and are connected successively. The first shaft segment is located at the outermost end and is inserted in the thrust roller bearing and the loading sleeve; the second shaft segment is inserted in the CARB bearing, and the outer end face of the second shaft segment abuts against the loading sleeve; the third shaft segment is inserted in the locking sleeve, and the outer end face of the third shaft segment abuts against the axial end face of the inner ring of the CARB bearing; the fourth shaft segment is inserted in the bearing to be tested.

7. The bearing failure mode prediction test bench in near-space low temperature environment according to claim 1 is characterized in that: Also included is a radial force driver; The output end of the radial force driving member abuts against the outer peripheral surface of the test bearing seat to apply radial force to the test bearing seat.

8. The bearing failure mode prediction test bench in near-space low temperature environment according to claim 1 is characterized in that: The transmission shaft includes a torque speed sensor shaft section, a transmission shaft section and two couplings. One end of the torque and speed sensor shaft segment is connected to the output shaft of the rotating drive member through one coupling, and the other end is connected to the transmission shaft segment through another coupling. The transmission shaft segment is inserted into the test hole through the measured bearing.

9. A bearing failure mode prediction test bench in a near-space low-temperature environment according to any one of claims 1 to 8, characterized in that: It also includes a support bearing seat; the support bearing seat is arranged between the rotary drive member and the test bearing seat; The supporting bearing seat is structured with a second through hole, and a double-row tapered roller bearing is arranged in the second through hole; the transmission shaft passes through the double-row tapered roller bearing and is arranged in the second through hole.

10. The bearing failure mode prediction test bench in near-space low temperature environment according to claim 9, characterized in that: A water cooling groove is constructed in the support bearing seat for passing cooling water.

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