Frictional torque detection structure and method

Abstract

This application relates to the field of detection, and provides a friction torque detection structure and method. The structure includes: a loading bracket, a first loading bearing, a first loading rotating shaft, a first loading bearing seat, and a first torque sensor; the first loading rotating shaft is fixedly connected to the side surface of the loading bracket, the first loading bearing is sleeved on the first loading rotating shaft, and the first loading bearing seat is sleeved on the first loading bearing; the first loading bearing seat includes a first protruding portion that protrudes away from the axis of the first loading bearing seat; the first torque sensor is arranged on the loading bracket and is fixedly connected to the first protruding portion. The structure provided by the embodiments of this application realizes the relative independence of the radial load and the first torque sensor, that is, the torque value of the first torque sensor is no longer used to directly represent the friction torque value inside the bearing to be measured, thereby reducing the detection error and improving the detection accuracy.

Description

Technical Field

[0001] The present application relates to the field of detection technology, and particularly relates to a friction torque detection structure and method. Background Art

[0002] As an important component of the transmission systems of various construction machinery, the operating state of a bearing directly affects the usage of the relevant construction machinery, and its failure directly affects the service life of the relevant construction machinery. For bearing failures, common bearing failure forms in engineering include raceway scuffing, roller damage, surface peeling, etc. Among them, the peeling of the bearing raceway material is fatal to the use of construction machinery. Once the bearing raceway material peels off, the peeled-off material will cause greater damage to the bearing rollers and raceways as the bearing rolls, and may even cause the bearing to jam, directly endangering the operating safety of the construction machinery. The peeling of the bearing raceway material is mainly caused by rolling contact fatigue between the bearing rollers and the raceway. The magnitude of the internal friction torque of the bearing is an important factor leading to the peeling of the bearing raceway material. Therefore, detecting and understanding the internal friction torque of the bearing has a very positive effect on detecting the operating state of the bearing and realizing the reliability evaluation and life prediction of the bearing structure.

[0003] At present, the internal friction torque of a bearing is mostly detected by the balance torque method. The internal friction torque of the bearing is obtained by connecting a torque tester or a testing device to the outer ring of the bearing, where one end of the torque meter is fixed and the other end is connected to the outer ring of the bearing. However, the external radial load applied by this method through a contact method will add an additional friction torque to the outer ring of the bearing, resulting in the result detected by the torque meter connected to the outer ring of the bearing not being the actual internal friction torque of the bearing, and the detection accuracy is not high. Summary of the Invention

[0004] The embodiments of the present application provide a friction torque detection structure and method to solve the technical problem that the result detected by the torque meter connected to the outer ring of the bearing is not the actual internal friction torque of the bearing, and the detection accuracy is not high.

[0005] In a first aspect, the embodiments of the present application provide a friction torque detection structure, including:

[0006] A loading bracket, a first loading bearing, a first loading rotating shaft, a first loading bearing seat, and a first torque sensor;

[0007] The first loading rotating shaft is fixedly connected to the side surface of the loading bracket, the first loading bearing is sleeved on the first loading rotating shaft, and the first loading bearing seat is sleeved on the first loading bearing;

[0008] The first loading bearing seat includes a first protruding portion that protrudes in a direction away from the axis of the first loading bearing seat;

[0009] The first torque sensor is disposed on the loading bracket, and the first torque sensor is fixedly connected to the first protrusion.

[0010] In one embodiment, the loading bracket includes a horizontal portion and a first vertical portion, and the bottom of the first vertical portion is fixedly connected to the top of the horizontal portion;

[0011] The first loading rotating shaft is fixedly connected to the side surface of the first vertical portion.

[0012] In one embodiment, the first torque sensor is disposed at one end of the horizontal portion close to the first vertical portion.

[0013] In one embodiment, it further includes: a second loading bearing, a second loading rotating shaft, a second loading bearing seat, and a second torque sensor;

[0014] The second loading rotating shaft is fixedly connected to the side surface of the loading bracket, the second loading bearing is sleeved on the second loading rotating shaft, and the second loading bearing seat is sleeved on the second loading bearing;

[0015] The second loading bearing seat includes a second protrusion, and the second protrusion protrudes in a direction away from the axis of the second loading bearing seat;

[0016] The second torque sensor is disposed on the loading bracket, and the second torque sensor is fixedly connected to the second protrusion.

[0017] In one embodiment, the loading bracket includes a second vertical portion, and the bottom of the second vertical portion is fixedly connected to the top of the horizontal portion;

[0018] The second loading rotating shaft is fixedly connected to the side surface of the second vertical portion.

[0019] In one embodiment, the second torque sensor is disposed at one end of the horizontal portion close to the second vertical portion.

[0020] In one embodiment, the first loading bearing seat is sleeved on the first loading bearing to form a first loading kit;

[0021] The second loading bearing seat is sleeved on the second loading bearing to form a second loading kit;

[0022] The first loading kit, the second loading kit, the first torque sensor, and the second torque sensor are located on the same vertical plane.

[0023] In one embodiment, the size of the first loading kit is less than or equal to the size of the bearing kit to be tested, and the size of the second loading kit is less than or equal to the size of the bearing kit to be tested;

[0024] The bearing kit to be tested includes a bearing housing to be tested and a bearing to be tested, and the bearing housing to be tested is sleeved on the bearing to be tested.

[0025] In a second aspect, an embodiment of the present application provides a method for detecting frictional torque, which is detected by using the frictional torque detection structure of the first aspect, and includes:

[0026] Set the bearing kit to be tested so that the bearing kit to be tested and the first loading kit are in the same vertical plane, the horizontal position of the axis of the bearing kit to be tested is higher than the horizontal position of the axis of the first loading kit, and the axes of the first loading kit, the bearing kit to be tested, and the first torque sensor are on the same straight line;

[0027] Adjust the position of the bearing kit to be tested so that the bearing kit to be tested is in contact with the first loading kit, and the acting force between the bearing kit to be tested and the first loading kit is zero;

[0028] Apply a first external load vertically upward to the loading bracket;

[0029] Clamp the first loading rotating shaft with a torque wrench and rotate the torque wrench. When the first loading bearing changes from a stationary state to a rotating state, read the torque value on the torque wrench to obtain a first static frictional torque value;

[0030] Keep the first external load unchanged and keep the first loading kit stationary, drive the inner ring of the bearing to be tested to rotate at a constant speed, and read the torque value of the first torque sensor to obtain a first torque value to be processed;

[0031] Add the first static frictional torque value and the first torque value to be processed to obtain the frictional torque value inside the bearing to be tested.

[0032] In a third aspect, an embodiment of the present application provides a method for detecting frictional torque, which is detected by using the frictional torque detection structure of the first aspect, and includes:

[0033] Set the bearing kit to be measured such that the bearing kit to be measured, the first loading kit, and the second loading kit are in the same vertical plane, the horizontal position of the axis of the bearing kit to be measured is higher than the horizontal position of the axis of the first loading kit, the horizontal position of the axis of the bearing kit to be measured is higher than the horizontal position of the axis of the second loading kit, and the axes of the first loading kit, the bearing kit to be measured, and the first torque sensor are on the same straight line, and the axes of the second loading kit, the bearing kit to be measured, and the second torque sensor are on the same straight line;

[0034] Adjust the position of the bearing kit to be measured so that the bearing kit to be measured is in contact with the first loading kit, the bearing kit to be measured is in contact with the second loading kit, and the force between the bearing kit to be measured and the first loading kit is zero, and the force between the bearing kit to be measured and the second loading kit is zero;

[0035] Apply a second external load vertically upward to the loading bracket;

[0036] Use a torque wrench to clamp the first loading rotating shaft and rotate the torque wrench. When the first loading bearing changes from a stationary state to a rotating state, read the torque value on the torque wrench to obtain a second static friction torque value;

[0037] Use a torque wrench to clamp the second loading rotating shaft and rotate the torque wrench. When the second loading bearing changes from a stationary state to a rotating state, read the torque value on the torque wrench to obtain a third static friction torque value;

[0038] Keep the second external load unchanged, keep the first loading kit and the second loading kit stationary, drive the inner ring of the bearing to be measured to rotate at a constant speed, and read the torque values of the first torque sensor and the second torque sensor to obtain a second torque value to be processed and a third torque value to be processed;

[0039] Add the second static friction torque value, the third static friction torque value, the second torque value to be processed, and the third torque value to be processed to obtain the friction torque value inside the bearing to be measured.

[0040] The friction torque detection structure and method provided by the embodiments of the present application include a loading bracket, a first loading bearing, a first loading rotating shaft, a first loading bearing seat, and a first torque sensor. The first loading rotating shaft is fixedly connected to the side surface of the loading bracket. The first loading bearing is sleeved on the first loading rotating shaft. The first loading bearing seat is sleeved on the first loading bearing. The first loading bearing seat includes a first protrusion that protrudes in a direction away from the axis of the first loading bearing seat. The first torque sensor is disposed on the loading bracket and is fixedly connected to the first protrusion. In this structure, the first loading bearing can be used to apply a radial load to the bearing to be measured, and the first torque sensor is not in direct contact with the bearing to be measured. Therefore, the radial load and the first torque sensor are relatively independent, that is, the torque value of the first torque sensor is no longer used to directly represent the friction torque value inside the bearing to be measured, thereby reducing the detection error and improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0042] Figure 1 is one of the schematic diagrams of the friction torque detection structure provided by the embodiments of the present application;

[0043] Figure 2 is another schematic diagram of the friction torque detection structure provided by the embodiments of the present application;

[0044] Figure 3 is one of the schematic flowcharts of the friction torque detection method provided by the embodiments of the present application;

[0045] Figure 4 is another schematic flowchart of the friction torque detection method provided by the embodiments of the present application.

[0046] REFERENCE SIGNS:

[0047] 1 - loading bracket; 11 - horizontal part; 12 - first vertical part; 13 - second vertical part; 2 - first loading bearing; 3 - first loading rotating shaft; 4 - first loading bearing seat; 41 - first protrusion; 5 - first torque sensor; 6 - second loading bearing; 7 - second loading rotating shaft; 8 - second loading bearing seat; 81 - second protrusion; 9 - second torque sensor; 10 - bearing seat to be measured; 14 - bearing to be measured. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0048] To make the objectives, technical solutions, and advantages of this application clearer, the following will clearly and completely describe the technical solutions in this application in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts belong to the scope of protection of this application.

[0049] Figure 1 is one of the schematic diagrams of the friction torque detection structure provided by the embodiments of this application. Refer to Figure 1 In the embodiments of this application, a friction torque detection structure is provided, which may include: a loading bracket 1, a first loading bearing 2, a first loading rotating shaft 3, a first loading bearing seat 4, and a first torque sensor 5;

[0050] The first loading rotating shaft 3 is fixedly connected to the side surface of the loading bracket 1. The first loading bearing 2 is sleeved on the first loading rotating shaft 3, and the first loading bearing seat 4 is sleeved on the first loading bearing 2;

[0051] The first loading bearing seat 4 includes a first protrusion 41 that protrudes in a direction away from the axis of the first loading bearing seat 4;

[0052] The first torque sensor 5 is arranged on the loading bracket 1 and is fixedly connected to the first protrusion 41.

[0053] The first loading bearing 2 and the first loading bearing seat 4 can be assembled by an interference fit method. The inner ring of the first loading bearing 2 rotates in cooperation with the first loading rotating shaft 3, the outer ring of the first loading bearing 2 rotates in cooperation with the first loading bearing seat 4, and rollers are arranged between the inner ring and the outer ring of the first loading bearing 2.

[0054] The length of the first protrusion 41 in the radial direction of the first loading bearing 2 matches the length of the outer peripheral surface of the first loading bearing seat 4 from the radial direction of the first loading bearing 2 to the first torque sensor 5, so that the torque is completely transmitted between the first loading bearing 2 and the first torque sensor 5 without the action of radial load.

[0055] The friction torque detection structure and method provided by this embodiment include a loading bracket, a first loading bearing, a first loading rotating shaft, a first loading bearing seat, and a first torque sensor. The first loading rotating shaft is fixedly connected to the side surface of the loading bracket. The first loading bearing is sleeved on the first loading rotating shaft. The first loading bearing seat is sleeved on the first loading bearing. The first loading bearing seat includes a first protrusion that protrudes in a direction away from the axis of the first loading bearing seat. The first torque sensor is arranged on the loading bracket and fixedly connected to the first protrusion. In this structure, the first loading bearing can be used to apply a radial load to the bearing under test, and the first torque sensor is not in direct contact with the bearing under test. Therefore, the radial load and the first torque sensor are relatively independent, that is, the torque value of the first torque sensor is no longer used to directly represent the friction torque value inside the bearing under test, thereby reducing the detection error and improving the detection accuracy.

[0056] See Figure 1 , in one embodiment, the loading bracket 1 may include a horizontal portion 11 and a first vertical portion 12. The bottom of the first vertical portion 12 is fixedly connected to the top of the horizontal portion 11;

[0057] The first loading rotating shaft 3 is fixedly connected to the side surface of the first vertical portion 12.

[0058] The first torque sensor 5 is arranged at one end of the horizontal portion 11 close to the first vertical portion 12.

[0059] In this embodiment, the first loading rotating shaft is fixedly connected to the side surface of the first vertical portion, and the first torque sensor is arranged at one end of the horizontal portion close to the first vertical portion, so that the distance between the first loading bearing seat sleeved on the first loading bearing and the first torque sensor is relatively close, which is convenient for the first torque sensor to be fixedly connected to the first protrusion of the first loading bearing seat.

[0060] Figure 2 is the second schematic diagram of the friction torque detection structure provided by the embodiment of the present application; See Figure 2 , in one embodiment, the friction torque detection structure may further include: a second loading bearing 6, a second loading rotating shaft 7, a second loading bearing seat 8, and a second torque sensor 9;

[0061] The second loading rotating shaft 7 is fixedly connected to the side surface of the loading bracket 1. The second loading bearing 6 is sleeved on the second loading rotating shaft 7. The second loading bearing seat 8 is sleeved on the second loading bearing 6;

[0062] The second loading bearing seat 8 includes a second protrusion 81 that protrudes in a direction away from the axis of the second loading bearing seat 8;

[0063] The second torque sensor 9 is arranged on the loading bracket 1 and fixedly connected to the second protrusion 81.

[0064] The second loading bearing 6 and the second loading bearing seat 8 can be assembled by interference fit. The inner ring of the second loading bearing 6 rotates in cooperation with the second loading rotating shaft 7, and the outer ring of the second loading bearing 6 rotates in cooperation with the second loading bearing seat 8. Rollers are arranged between the inner ring and the outer ring of the second loading bearing 6.

[0065] The length of the second protrusion 81 in the radial direction of the second loading bearing 6 matches the length of the outer peripheral surface of the second loading bearing seat 8 from the second loading bearing 6 in the radial direction to the second torque sensor 9, so that torque is completely transmitted between the second loading bearing 6 and the second torque sensor 9 without the action of radial load.

[0066] In this embodiment, by adding one more loading bearing, loading rotating shaft, loading bearing seat and torque sensor, the bearing under test can be better supported when detecting the internal frictional torque of the bearing under test, so that the radial load can be applied to the bearing under test more accurately, improving the detection accuracy.

[0067] See Figure 2 , in one embodiment, the loading bracket 1 includes a second vertical portion 13, and the bottom of the second vertical portion 13 is fixedly connected to the top of the horizontal portion 11;

[0068] The second loading rotating shaft 7 is fixedly connected to the side surface of the second vertical portion 13.

[0069] The second torque sensor 9 is arranged at one end of the horizontal portion 11 close to the second vertical portion 13.

[0070] In this embodiment, the second loading rotating shaft is fixedly connected to the side surface of the second vertical portion, and the second torque sensor is arranged at one end of the horizontal portion close to the second vertical portion, so that the distance between the second loading bearing seat sleeved on the second loading bearing and the second torque sensor is relatively close, facilitating the fixed connection between the second torque sensor and the second protrusion of the second loading bearing seat.

[0071] See Figure 2 , in one embodiment, the first loading bearing seat 4 is sleeved on the first loading bearing 2 to form a first loading kit;

[0072] The second loading bearing seat 8 is sleeved on the second loading bearing 6 to form a second loading kit;

[0073] The first loading kit, the second loading kit, the first torque sensor 5 and the second torque sensor 9 are located on the same vertical plane.

[0074] When the first loading kit, the second loading kit, the first torque sensor 5 and the second torque sensor 9 are not in the same vertical plane, the first loading kit and the second loading kit cannot simultaneously apply a complete radial load to the bearing under test 14. Either at least one of the first loading kit and the second loading kit generates a force in a direction other than the radial force on the bearing under test 14, or the first loading kit and the second loading kit do not generate a force in other directions on the bearing under test 14, but at least one of the loading kits has a direct loss of the radial load generated on the bearing under test 14. When the first loading kit and the second loading kit are used in combination to measure the internal friction torque of the bearing under test 14, it will have an adverse effect. At the same time, the first torque sensor 5 and the second torque sensor 9 will also cause deviations in the measured values due to this adverse effect. Therefore, in this embodiment, the first loading kit, the second loading kit, the first torque sensor 5 and the second torque sensor 9 need to be set in the same vertical plane.

[0075] In this embodiment, by setting the first loading kit, the second loading kit, the first torque sensor and the second torque sensor in the same vertical plane, when the first loading kit and the second loading kit are used in combination to measure the internal friction torque of the bearing under test, the forces exerted by the first loading kit and the second loading kit on the bearing under test kit can be all converted into radial loads, avoiding adverse effects on the measurement results.

[0076] Figure 3 is one of the schematic flowcharts of the friction torque detection method provided by the embodiment of the present application; referring to Figure 1 and 3 , the embodiment of the present application provides a friction torque detection method, which may include:

[0077] 301. Set the bearing under test kit so that the bearing under test kit and the first loading kit are in the same vertical plane, the horizontal position of the axis of the bearing under test kit is higher than the horizontal position of the axis of the first loading kit, and the axes of the first loading kit, the bearing under test kit and the first torque sensor are on the same straight line;

[0078] 302. Adjust the position of the bearing under test kit so that the bearing under test kit is in contact with the first loading kit, and the force between the bearing under test kit and the first loading kit is zero;

[0079] 303. Apply a first external load vertically upward to the loading bracket;

[0080] 304. Use a torque wrench to clamp the first loading rotating shaft and rotate the torque wrench. When the first loading bearing changes from a stationary state to a rotating state, read the torque value on the torque wrench to obtain the first static friction torque value;

[0081] 305. Keep the first external load unchanged and keep the first loading kit stationary. Drive the inner ring of the bearing under test to rotate at a constant speed, and read the torque value of the first torque sensor to obtain the first torque value to be processed.

[0082] 306. Add the first static friction torque value and the first torque value to be processed to obtain the friction torque value inside the bearing under test.

[0083] In step 301, the bearing kit under test includes the bearing housing under test 10 and the bearing under test 14. The bearing housing under test 10 is sleeved on the bearing under test 14, and the bearing housing under test 10 and the bearing under test 14 can be assembled by interference fit.

[0084] Since the first loading kit and the first torque sensor in the friction torque detection structure are located on the same vertical plane, at this time, the bearing kit under test, the first loading kit and the first torque sensor are located on the same vertical plane.

[0085] In step 303, apply a first external load F1 vertically upward to the loading bracket. Since the bearing kit under test, the first loading kit and the first torque sensor are located on the same vertical plane and the axes of the first loading kit, the bearing kit under test and the first torque sensor are located on the same straight line, it prompts the first loading kit to apply a complete first radial load to the bearing kit under test.

[0086] In step 304, rotate the torque wrench to drive the first loading rotating shaft to rotate, and then drive the inner ring of the first loading bearing to rotate. The first static friction torque value M 2ro is the static friction torque value of the rollers in the first loading bearing against the outer raceway under the first radial load.

[0087] In step 305, assume that the inner ring of the bearing under test rotates counterclockwise at a speed of ω1. At this time, it is necessary to keep the inner ring of the first loading bearing stationary. Then the first torque value to be processed M2 is the torque value M 12 applied by the bearing kit under test to the first loading kit at the contact point under the first radial load 2ro minus the first static friction torque value M 12 obtained torque value, that is, M2 = M 2ro - M 12 = M2 + M 2ro .

[0088] In step 306, the friction torque value M T1 inside the bearing under test under the first radial load is the torque value M 21 applied by the first loading kit to the bearing kit under test at the contact point under the first radial load, that is, M T1 = M 21 , since the torque value M applied by the first loading kit to the bearing kit under test at the contact point21 The torque value M applied by the first loading kit to the bearing kit to be measured at the contact point 12 is equal, i.e., M 21 = M 12 , and the torque value M applied by the bearing kit to be measured to the first loading kit at the contact point 12 is equal to the sum of the first moment value to be processed M2 and the first static friction torque value M 2ro , i.e., M 12 = M2 + M 2ro , then the torque value M applied by the first loading kit to the bearing kit to be measured at the contact point under the first radial load 21 is equal to the sum of the first moment value to be processed M2 and the first static friction torque value M 2ro , i.e., M 21 = M2 + M 2ro , the friction torque value M inside the bearing to be measured under the first radial load T1 is equal to the sum of the first moment value to be processed M2 and the first static friction torque value M 2ro , i.e., M T1 = M2 + M 2ro . The friction torque value M inside the bearing to be measured T1 is also the friction torque value of the rollers inside the bearing to be measured against the inner raceway of the shaft to be measured under the first radial load.

[0089] In this embodiment, by applying a first external load vertically upward to the loading bracket, the first loading kit is prompted to apply a first radial load to the bearing kit to be measured. According to the sum of the static friction torque value of the rollers inside the first loaded bearing against the outer raceway and the first moment value to be processed measured by the first torque sensor under the first radial load, the friction torque value inside the bearing to be measured under the first radial load is obtained. This method realizes the relative independence of the radial load and the torque sensor, that is, the torque value of the torque sensor is no longer used to directly represent the friction torque value inside the bearing to be measured, thereby reducing the detection error and improving the detection accuracy. At the same time, the first external load can also be increased as needed, that is, the first radial load is increased, so that it can be applied to the detection of the internal friction torque of various large and medium-sized bearings in construction machinery. In addition, the direction of the radial load received by the bearing kit to be measured can be adjusted by adjusting the position of the first loading kit, so as to realize the detection of the internal friction torque of the bearing under radial loads in different directions.

[0090] Figure 4 is the second schematic flow chart of the friction torque detection method provided by the embodiment of the present application; referring to Figure 2 and 4 , the embodiment of the present application provides a friction torque detection method, which may include:

[0091] 401. Set the bearing kit to be measured so that the bearing kit to be measured, the first loading kit, and the second loading kit are in the same vertical plane. The horizontal position of the axis of the bearing kit to be measured is higher than the horizontal position of the axis of the first loading kit, and the horizontal position of the axis of the bearing kit to be measured is higher than the horizontal position of the axis of the second loading kit. Moreover, the axes of the first loading kit, the bearing kit to be measured, and the first torque sensor are on the same straight line, and the axes of the second loading kit, the bearing kit to be measured, and the second torque sensor are on the same straight line;

[0092] 402. Adjust the position of the bearing kit to be measured so that the bearing kit to be measured is in contact with the first loading kit and the second loading kit, and the force between the bearing kit to be measured and the first loading kit is zero, and the force between the bearing kit to be measured and the second loading kit is zero;

[0093] 403. Apply a second external load vertically upward to the loading bracket;

[0094] 404. Use a torque wrench to clamp the first loading rotating shaft and rotate the torque wrench. When the first loading bearing changes from a stationary state to a rotating state, read the torque value on the torque wrench to obtain the second static friction torque value;

[0095] 405. Use a torque wrench to clamp the second loading rotating shaft and rotate the torque wrench. When the second loading bearing changes from a stationary state to a rotating state, read the torque value on the torque wrench to obtain the third static friction torque value;

[0096] 406. Keep the second external load unchanged and keep the first loading kit and the second loading kit stationary. Drive the inner ring of the bearing to be measured to rotate at a constant speed, and read the torque values of the first torque sensor and the second torque sensor to obtain the second torque value to be processed and the third torque value to be processed;

[0097] 407. Add the second static friction torque value, the third static friction torque value, the second torque value to be processed, and the third torque value to be processed to obtain the friction torque value inside the bearing to be measured.

[0098] In step 401, since the first loading kit, the second loading kit, the first torque sensor, and the second torque sensor in the friction torque detection structure are in the same vertical plane, at this time, the bearing kit to be measured, the first loading kit, the second loading kit, the first torque sensor, and the second torque sensor are in the same vertical plane.

[0099] In step 403, a second external load F2 is applied vertically upward to the loading bracket. Since the bearing kit under test, the first loading kit, the second loading kit, the first torque sensor, and the second torque sensor are on the same vertical plane, and the axes of the first loading kit, the bearing kit under test, and the first torque sensor are on the same straight line, and the axes of the second loading kit, the bearing kit under test, and the second torque sensor are on the same straight line, the first loading kit applies a complete second radial load to the bearing kit under test, and the second loading kit applies a complete third radial load to the bearing kit under test.

[0100] In step 404, the torque wrench is rotated to drive the first loading rotating shaft to rotate, thereby driving the inner ring of the first loading bearing to rotate. The second static friction torque value M 3ro is the static friction torque value of the rollers in the first loading bearing against the outer raceway under the second radial load;

[0101] In step 405, the torque wrench is rotated to drive the second loading rotating shaft to rotate, thereby driving the inner ring of the second loading bearing to rotate. The third static friction torque value M 4ro is the static friction torque value of the rollers in the second loading bearing against the outer raceway under the third radial load;

[0102] It should be noted that in practical applications, there is no strict timing relationship between step 404 and step 405; that is, they can be executed simultaneously, or either step can be executed first, depending on the actual requirements, and it is not limited here.

[0103] In step 406, it is assumed that the inner ring of the bearing under test rotates counterclockwise at a speed of ω2. At this time, it is necessary to keep the inner rings of the first loading bearing and the second loading bearing stationary. The second torque value to be processed M3 is the torque value M 13 applied by the bearing kit under test to the first loading kit at the contact point under the second radial load minus the second static friction torque value M 3ro obtained torque value, that is, M3 = M 13 - M 3ro , M 13 = M3 + M 3ro , the third torque value to be processed M4 is the torque value M 14 applied by the bearing kit under test to the second loading kit at the contact point under the third radial load minus the third static friction torque value M 4ro obtained torque value, that is, M4 = M 14 - M 4ro , M 14 = M4 + M 4ro .

[0104] In step 407, the friction torque value M T2The torque value M applied by the first loading kit to the bearing kit under test at the contact point under the second radial load 31 And the torque value M applied by the second loading kit to the bearing kit under test at the contact point under the third radial load 41 The sum, that is, M T2 = M 31 + M 41 , because the torque value M applied by the first loading kit to the bearing kit under test at the contact point 31 Is equal to the torque value M applied by the bearing kit under test to the first loading kit at the contact point 13 , that is, M 31 = M 13 , the torque value M applied by the second loading kit to the bearing kit under test at the contact point 41 Is equal to the torque value M applied by the bearing kit under test to the second loading kit at the contact point 14 , that is, M 41 = M 14 , and the torque value M applied by the bearing kit under test to the first loading kit at the contact point 13 Is equal to the sum of the second torque value to be processed M3 and the second static friction torque value M 3ro , that is, M 13 = M3 + M 3ro , the torque value M applied by the bearing kit under test to the second loading kit at the contact point 14 Is equal to the sum of the third torque value to be processed M4 and the third static friction torque value M 4ro , that is, M 14 = M4 + M 4ro , then the torque value M applied by the first loading kit to the bearing kit under test at the contact point under the second radial load 31 Is equal to the sum of the second torque value to be processed M3 and the second static friction torque value M 3ro , that is, M 31 = M3 + M 3ro , the torque value M applied by the second loading kit to the bearing kit under test at the contact point under the third radial load 41 Is equal to the sum of the third torque value to be processed M4 and the third static friction torque value M 4ro , that is, M 41 = M4 + M 4ro , the friction torque value M inside the bearing under test under the second radial load and the third radial load T2 Is equal to the sum of the second torque value to be processed M3, the second static friction torque value M 3ro , the third torque value to be processed M4 and the third static friction torque value M 4ro , that is, M T2 = M3 + M 3ro + M4 + M 4ro . The friction torque value M inside the bearing under test T2They are also the friction torque values of the rollers inside the bearing under test against the inner raceway of the shaft under test under the second radial load and the third radial load.

[0105] It should be noted that for the convenience of measurement and setting, the first loading kit and the second loading kit can be set at the same horizontal height, and the size of the first loading kit is less than or equal to the size of the bearing kit under test, and the size of the second loading kit is less than or equal to the size of the bearing kit under test, so as to avoid the contact points with the bearing kit under test being marginalized when the size of the first loading kit or the second loading kit is too large, weakening the radial load on the bearing kit under test.

[0106] In this embodiment, by applying a second external load vertically upward to the loading bracket, the first loading kit is urged to apply a second radial load to the bearing kit under test, and the second loading kit is urged to apply a third radial load to the bearing kit under test. According to the sum of the static friction torque value of the rollers inside the first loading bearing against the outer raceway under the second radial load, the second torque value to be processed measured by the first torque sensor, the static friction torque value of the rollers inside the second loading bearing against the outer raceway under the third radial load, and the third torque value to be processed measured by the second torque sensor, the friction torque value inside the bearing under test under the second radial load and the third radial load is obtained. This method realizes the relative independence of the radial load and the torque sensor, that is, the torque value of the torque sensor is no longer used to directly represent the friction torque value inside the bearing under test, thereby reducing the detection error and improving the detection accuracy. At the same time, the second external load can also be increased as needed, that is, the second radial load and the third radial load are increased, so that it can be applied to the detection of the internal friction torque of various large and medium-sized bearings in construction machinery. In addition, the direction of the radial load received by the bearing kit under test can be adjusted by adjusting the distance between the first loading kit and the second loading kit, so as to realize the detection of the internal friction torque of the bearing under different directions of radial load.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for detecting frictional torque, characterized in that, Comprising: Set the bearing kit to be tested such that the bearing kit to be tested and the first loading kit are in the same vertical plane, the horizontal position of the axis of the bearing kit to be tested is higher than the horizontal position of the axis of the first loading kit, and the axes of the first loading kit, the bearing kit to be tested, and the first torque sensor are on the same straight line; Adjust the position of the bearing kit to be tested such that the bearing kit to be tested is in contact with the first loading kit and the force between the bearing kit to be tested and the first loading kit is zero; Apply a first external load vertically upward to the loading bracket; Clamp the first loading rotating shaft with a torque wrench and rotate the torque wrench. When the first loading bearing changes from a stationary state to a rotating state, read the torque value on the torque wrench to obtain the first static friction torque value; Keep the first external load unchanged and keep the first loading kit stationary. Drive the inner ring of the bearing to be tested to rotate at a constant speed and read the torque value of the first torque sensor to obtain the first torque value to be processed; Add the first static friction torque value and the first torque value to be processed to obtain the friction torque value inside the bearing to be tested; Wherein, the first loading rotating shaft is fixedly connected to the side surface of the loading bracket, the first loading bearing is sleeved on the first loading rotating shaft, and the first loading bearing seat is sleeved on the first loading bearing; The first loading bearing seat includes a first protruding portion that protrudes away from the axis of the first loading bearing seat; The first torque sensor is arranged on the loading bracket and is fixedly connected to the first protruding portion; The loading bracket includes a horizontal portion and a first vertical portion, and the bottom of the first vertical portion is fixedly connected to the top of the horizontal portion; The first loading rotating shaft is fixedly connected to the side surface of the first vertical portion; The first torque sensor is arranged at one end of the horizontal portion close to the first vertical portion; The first loading bearing seat is sleeved on the first loading bearing to form the first loading kit; The first loading kit and the first torque sensor are in the same vertical plane; The size of the first loading kit is less than or equal to the size of the bearing kit to be tested. The bearing kit to be tested includes a bearing seat to be tested and the bearing to be tested, and the bearing seat to be tested is sleeved on the bearing to be tested.

2. A method for detecting frictional torque, characterized in that, Comprising: Set the bearing kit to be tested such that the bearing kit to be tested, the first loading kit, and the second loading kit are in the same vertical plane, the horizontal position of the axis of the bearing kit to be tested is higher than the horizontal position of the axis of the first loading kit, the horizontal position of the axis of the bearing kit to be tested is higher than the horizontal position of the axis of the second loading kit, and the axes of the first loading kit, the bearing kit to be tested, and the first torque sensor are on the same straight line, and the axes of the second loading kit, the bearing kit to be tested, and the second torque sensor are on the same straight line; Adjust the position of the bearing kit to be measured so that the bearing kit to be measured is in contact with the first loading kit and the second loading kit, and the acting force between the bearing kit to be measured and the first loading kit is zero, and the acting force between the bearing kit to be measured and the second loading kit is zero; Apply a second external loading force vertically upward to the loading bracket; Clamp the first loading rotating shaft with a torque wrench and rotate the torque wrench. When the first loading bearing changes from a stationary state to a rotating state, read the torque value on the torque wrench to obtain the second static friction torque value; Clamp the second loading rotating shaft with a torque wrench and rotate the torque wrench. When the second loading bearing changes from a stationary state to a rotating state, read the torque value on the torque wrench to obtain the third static friction torque value; Keep the second external loading force unchanged and keep the first loading kit and the second loading kit stationary. Drive the inner ring of the bearing to be measured to rotate at a constant speed, and read the torque values of the first torque sensor and the second torque sensor to obtain the second torque value to be processed and the third torque value to be processed; Add the second static friction torque value, the third static friction torque value, the second torque value to be processed and the third torque value to be processed to obtain the friction torque value inside the bearing to be measured; Wherein, the first loading rotating shaft is fixedly connected to the side surface of the loading bracket, the first loading bearing is sleeved on the first loading rotating shaft, and the first loading bearing seat is sleeved on the first loading bearing; The first loading bearing seat includes a first protruding portion that protrudes in a direction away from the axis of the first loading bearing seat; The first torque sensor is arranged on the loading bracket and is fixedly connected to the first protruding portion; The loading bracket includes a horizontal portion and a first vertical portion, and the bottom of the first vertical portion is fixedly connected to the top of the horizontal portion; The first loading rotating shaft is fixedly connected to the side surface of the first vertical portion; The first torque sensor is arranged at one end of the horizontal portion close to the first vertical portion; The second loading rotating shaft is fixedly connected to the side surface of the loading bracket, the second loading bearing is sleeved on the second loading rotating shaft, and the second loading bearing seat is sleeved on the second loading bearing; The second loading bearing seat includes a second protruding portion that protrudes in a direction away from the axis of the second loading bearing seat; The second torque sensor is arranged on the loading bracket and is fixedly connected to the second protruding portion; The loading bracket includes a second vertical portion, and the bottom of the second vertical portion is fixedly connected to the top of the horizontal portion; The second loading rotating shaft is fixedly connected to the side surface of the second vertical portion; The second torque sensor is arranged at one end of the horizontal portion close to the second vertical portion; The first loading bearing seat is sleeved on the first loading bearing to form the first loading kit; The second loading bearing seat is sleeved on the second loading bearing to form the second loading kit; The first loading kit, the second loading kit, the first torque sensor, and the second torque sensor are located on the same vertical plane; The size of the first loading kit is less than or equal to the size of the bearing kit to be measured, and the size of the second loading kit is less than or equal to the size of the bearing kit to be measured; The bearing kit to be measured includes a bearing housing to be measured and the bearing to be measured, and the bearing housing to be measured is sleeved on the bearing to be measured.

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