Rolling bearing friction torque measuring device

Abstract

The application provides a rolling bearing friction torque measuring device, and belongs to the technical field of aero-engine and bearing testing. The measuring device is used for measuring the friction torque of a rolling bearing to be measured. The measuring device comprises a bearing seat used for fixing the rolling bearing to be measured, two groups of tension rod assemblies used for loading and measuring the load size of the rolling bearing to be measured, a cross beam connected to the other end of the tension rod assemblies, a bearing adapter assembly used for connecting the tension rod assemblies, the bearing seat and the cross beam, and a guide assembly used for controlling the up-and-down movement of the cross beam. The measuring device solves the problem of measuring the friction torque of a high-speed rolling bearing in the working state of an aero-engine. The highest rotating speed of the high-speed rolling bearing to be measured can reach 10000r / min.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine dynamic and bearing testing technology, specifically relating to a rolling bearing friction torque measuring device. Background Technology

[0002] Aero-engine main bearings operate at high speeds, bear heavy loads, and undergo varied operating conditions, generating significant heat and posing substantial challenges to the design of lubrication and cooling systems. Accurately assessing the bearing's frictional torque and providing precise cooling oil flow rates are crucial for avoiding excessive design margins that lead to bloated structures and reduced engine weight. Furthermore, accurate assessment of the bearing's frictional torque provides precise boundary conditions for analyzing the temperature field within the bearing cavity.

[0003] Existing technologies mainly involve the measurement of frictional torque in low-speed bearings, and are primarily used for grease-lubricated or self-lubricating bearings. Furthermore, existing technical solutions often employ torque sensors for measurement, which are difficult to apply in high-speed environments due to shaft interference.

[0004] Therefore, there is a need for a device that can solve the problem of measuring the friction torque of high-speed rolling bearings in aero engines. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to provide a rolling bearing friction torque measuring device to solve the problem of measuring the friction torque of high-speed rolling bearings in aero-engines during operation.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a rolling bearing friction torque measuring device for measuring the friction torque of a rolling bearing under test. The measuring device includes a bearing housing for fixing the rolling bearing under test, two sets of tension rod assemblies for applying load to the rolling bearing under test and measuring the load magnitude, a crossbeam connected to the other end of the tension rod assemblies, a bearing adapter assembly for connecting the tension rod assemblies, the bearing housing, and the crossbeam, and a guide assembly for controlling the up-and-down movement of the crossbeam.

[0007] The distance between the two sets of tension rod assemblies and the end connected to the rolling bearing under test is A, and the distance between the two sets of tension rod assemblies and the end connected to the crossbeam is B. Then A < B.

[0008] The intersection of the extended centerlines of the two sets of tension bar assemblies is higher than the axis of the rolling bearing under test.

[0009] The rolling bearing friction torque measuring device provided by the present invention also has the following feature: the bearing adapter assembly includes an upper bearing adapter assembly for connecting the tension rod assembly and the crossbeam, and a lower bearing adapter assembly for connecting the tension rod assembly and the bearing housing.

[0010] The tension rod assembly includes a tension rod fixed to the lower bearing adapter assembly, a force sensor fixed to the upper bearing adapter assembly, and a sensor adapter plate for connecting the tension rod and the force sensor.

[0011] The rolling bearing friction torque measuring device provided by the present invention also has the feature that the side of the crossbeam is provided with a guide surface that cooperates with the guide assembly.

[0012] The rolling bearing friction torque measuring device provided by the present invention also has the following feature: the bearing adapter assembly includes a short shaft fixed to the bearing housing or the crossbeam, a bearing sleeved on the short shaft, an adapter seat for fixing the bearing, and a cotter pin for fixing the short shaft.

[0013] The rolling bearing friction torque measuring device provided by the present invention also has the following feature: the guide assembly includes a base, a loading rod assembly disposed on the base for providing an upward force to the crossbeam, a guide seat connected to the base, and a top plate fixedly connected to the upper side of the guide seat.

[0014] The guide seat has a groove for placing the crossbeam. The crossbeam moves up and down in the groove under the action of the loading rod assembly. The inner side of the groove has a guide groove for limiting the horizontal position of the crossbeam.

[0015] The rolling bearing friction torque measuring device provided by the present invention also has the feature that a diaphragm for sealing is provided between the base and the loading rod assembly.

[0016] The rolling bearing friction torque measuring device provided by the present invention also has the feature that the measuring device further includes a housing for fixing the measuring device.

[0017] The rolling bearing friction torque measuring device provided by the present invention also has the following feature: the loading rod assembly includes a loading guide seat fixedly connected to the base, a loading piston passing through the central through hole of the loading guide seat, and a loading rod connected to the loading piston, wherein the ball head at the top of the loading rod contacts the crossbeam.

[0018] The rolling bearing friction torque measuring device provided by the present invention also has the following feature: the base is provided with a cavity for containing high-pressure oil, which is used to provide an upward force to the loading rod assembly.

[0019] The rolling bearing friction torque measuring device provided by the present invention also has the feature that the base is provided with a pipe joint for connecting a hydraulic loading device.

[0020] The rolling bearing friction torque measuring device provided by the present invention also has the feature that the distance between the extended center line of the two sets of tension rod assemblies and the center line of the rolling bearing to be measured is 5mm.

[0021] Beneficial effects:

[0022] The rolling bearing friction torque measuring device provided by this invention solves the problem of measuring friction torque in the working state of high-speed rolling bearings of aero engines, and the applicable high-speed rolling bearings can reach a maximum speed of 10000 r / min. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a structural diagram of the rolling bearing friction torque measuring device provided in an embodiment of the present invention, showing its usage state.

[0025] Figure 2 for Figure 1 A sectional view;

[0026] Figure 3 This is a cross-sectional view of the bearing adapter assembly provided in an embodiment of the present invention;

[0027] Figure 4 This is an enlarged view of the rolling bearing friction torque measuring device and the rolling bearing connection provided in an embodiment of the present invention.

[0028] Figure 5 This is a schematic diagram of the rolling bearing friction torque measuring device provided in an embodiment of the present invention;

[0029] Among them, 1-bearing housing, 2-rolling bearing to be tested, 3-housing, 4-bearing adapter assembly, 4-1-first lower bearing adapter assembly, 4-2-first upper bearing adapter assembly, 4-3-second upper bearing adapter assembly, 4-4-second lower bearing adapter assembly, 5-tension rod assembly, 5-1-left tension rod assembly, 5-2-right tension rod assembly, 6-crossbeam, 7-top plate, 8-guide seat, 9-loading rod assembly, 10-diaphragm, 11-base, 12-plug, 13- - Pipe fitting, 14- Main shaft, 15- First auxiliary bearing, 16- Right oil baffle, 17- Lower housing, 18- Right bearing seat, 19- Left bearing seat, 20- Left oil baffle, 21- Second auxiliary bearing, 22- Upper housing, 401- Adapter seat, 402- Bearing, 403- Short shaft, 404- Cotter pin, 501- Tension rod, 502- Sensor adapter plate, 503- Force sensor, 901- Loading guide seat, 902- Loading piston, 903- Loading rod. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent changes or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the protection scope of the present invention.

[0031] In the description of the embodiments of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention.

[0032] Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0033] The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of these terms in this invention based on the specific circumstances.

[0034] like Figure 1 As shown, a rolling bearing friction torque measuring device is provided for measuring the friction torque of a rolling bearing 2 under test. The measuring device includes a bearing housing 1 for fixing the rolling bearing 2 under test, two sets of tension rod assemblies 5 for loading the rolling bearing 2 under test and measuring the load, a crossbeam 6 connected to the other end of the tension rod assembly 5, a bearing adapter assembly 4 for connecting the tension rod assembly 5, the bearing housing 1, and the crossbeam 6, and a guide assembly for controlling the up-and-down movement of the crossbeam 6. The distance between the two sets of tension rod assemblies 5 and the end connected to the rolling bearing 2 under test is A, and the distance between the two sets of tension rod assemblies 5 and the end connected to the crossbeam 6 is B, where A < B. The two sets of tension rod assemblies 5 are arranged in a V-shape, and the intersection of the extended center lines of the two sets of tension rod assemblies 5 is higher than the axis of the rolling bearing 2 under test. The two sets of tension rod assemblies 5 include a left tension rod assembly 5-1 and a right tension rod assembly 5-2 with identical structures.

[0035] In some embodiments, the bearing adapter assembly 4 includes an upper bearing adapter assembly for connecting the tension rod assembly 5 and the crossbeam 6, and a lower bearing adapter assembly for connecting the tension rod assembly 5 and the bearing seat 1. The tension rod assembly 5 includes a tension rod 501 fixed to the lower bearing adapter assembly, a force sensor 503 fixed to the upper bearing adapter assembly, and a sensor adapter plate 502 for connecting the tension rod 501 and the force sensor 503. The tension rod 501 passes through a hole in the center of the sensor adapter plate 502, and bolts pass through mounting holes on the sensor adapter plate 502 and the force sensor 503 to fix the two parts together.

[0036] In the above embodiment, the upper bearing adapter assembly includes a first upper bearing adapter assembly 4-2 and a second upper bearing adapter assembly 4-3. One end of the first upper bearing adapter assembly 4-2 and the second upper bearing adapter assembly 4-3 are connected to the crossbeam 6, and the other end is connected to two sets of tension rod assemblies 5 respectively. The lower bearing adapter assembly includes a first lower bearing adapter assembly 4-1 and a second lower bearing adapter assembly 4-3. One end of the first lower bearing adapter assembly 4-1 and the second lower bearing adapter assembly 4-3 are connected to two sets of tension rod assemblies 5 respectively, and the other end is connected to the bearing seat 1.

[0037] In some embodiments, the side of the crossbeam 6 is provided with a guide surface that cooperates with the guide assembly.

[0038] In some embodiments, the bearing adapter assembly 4 includes a short shaft 403 fixed to the bearing housing 1 or the crossbeam 6, a bearing 402 sleeved on the short shaft 403, an adapter seat 401 for fixing the bearing 402, and a cotter pin 404 for fixing the short shaft 403. The outer ring of the bearing 402 is installed inside the adapter seat 401, and the inner ring of the bearing 402 is installed on the short shaft 403. Both ends of the short shaft 403 are installed in corresponding openings in the bearing housing 1 or the crossbeam 6. The cotter pin 404 passes through the hole on the short shaft 403 to prevent the short shaft 403 from falling off.

[0039] In some embodiments, the guide assembly includes a base 11, a loading rod assembly 9 disposed on the base 11 for providing an upward force to the crossbeam 6, a guide seat 8 connected to the base 11, and a top plate 7 fixedly connected to the upper side of the guide seat 8. The top plate 7 is fixed to the guide seat 8 by screws, and the guide seat 8 is fixed to the base 11 by screws.

[0040] The guide seat 8 has a groove for placing the crossbeam 6. The crossbeam 6 moves up and down within the groove under the action of the loading rod assembly 9. The inner side of the groove has a guide groove for limiting the horizontal position of the crossbeam 6. The crossbeam 6 is inserted into the guide seat 8 from top to bottom, as... Figure 3 As shown, the guide surface of the guide groove constrains the position of the crossbeam 6, so that the crossbeam 6 can only slide in the vertical direction.

[0041] In some embodiments, a diaphragm 10 for sealing is provided between the base 11 and the loading rod assembly 9. The diaphragm 10 is used to seal the high-pressure oil in the groove on the upper surface of the base 11.

[0042] In some embodiments, the measuring device further includes a housing 3 for securing the measuring device.

[0043] In some embodiments, the loading rod assembly 9 includes a loading guide seat 901 fixedly connected to the base 11, a loading piston 902 passing through a central through hole in the loading guide seat 901, and a loading rod 903 connected to the loading piston 902. The ball head at the top of the loading rod 903 contacts the crossbeam 6. The ball head is used to transfer the load to the crossbeam 6.

[0044] In some embodiments, the base 11 is provided with a cavity for containing high-pressure oil, which is used to provide an upward force to the loading rod assembly 9.

[0045] In some embodiments, the base 11 is also provided with a pipe joint 13 for connecting a hydraulic loading device. After the pipe joint 13 is connected to the hydraulic loading device, the air in the groove is discharged using a plug 12, which is in a tightened state when the measuring device is working.

[0046] In some embodiments, the distance L between the extended centerline of the two sets of tension rod assemblies 5 and the centerline of the rolling bearing 2 under test is 5mm.

[0047] In some embodiments, bearing 402 is a needle roller bearing.

[0048] In some embodiments, the force sensor 503 is a spoke-type sensor, and the measurement accuracy is not less than 0.1%FS.

[0049] In some embodiments, the diaphragm 10 is made of fluororubber.

[0050] In some embodiments, the loading rod assembly 9 can be replaced by a hydraulic cylinder.

[0051] In some embodiments, the guide surface is coated with lubricating oil to reduce friction.

[0052] like Figure 5 As shown, the rolling bearing 2 under test is fixed on the main shaft 14. The first auxiliary bearing 15 and the second auxiliary bearing 21, which are interference-fitted with the main shaft 14, support the high-speed rotation of the main shaft 14 and are respectively installed in the right bearing housing 18 and the left bearing housing 19. The lower housing 17 and the upper housing 22, which are fixedly connected, together restrict the positions of the right bearing housing 18 and the left bearing housing 19. The right oil baffle 16 fixed to the right bearing housing 18 and the left oil baffle 20 fixed to the left bearing housing 19 are used to prevent lubricating oil leakage.

[0053] During the test, high-pressure oil is introduced into the pipe joint 12 via a hydraulic loading device. The diaphragm 10, acting on the oil, pushes the loading piston 902 and loading rod 903 upwards. Simultaneously, the crossbeam 6, moving upwards under the action of the loading rod 903, transmits the load to the two sets of tension rod assemblies 5. The tension rod assemblies 5 then transfer the load to the rolling bearing 2 under test. When the spindle rotates, a frictional torque is generated on the rolling bearing 2 under test. This torque causes a significant difference in the load values ​​measured on the two sets of tension rods 5. The difference in load values ​​varies with the frictional torque. Through appropriate calibration tests, the magnitude of the frictional torque can be obtained.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A rolling bearing friction torque measuring device, used to measure the friction torque of a rolling bearing (2) to be measured, characterized in that, The measuring device includes a bearing housing (1) for fixing the rolling bearing (2) under test, two sets of tension rod assemblies (5) for loading the rolling bearing (2) under test and measuring the load, a crossbeam (6) connected to the other end of the tension rod assembly (5), a bearing adapter assembly (4) for connecting the tension rod assembly (5), the bearing housing (1), and the crossbeam (6), and a guide assembly for controlling the up and down movement of the crossbeam (6). The distance between the two sets of tension rod assemblies (5) and the end connected to the rolling bearing (2) to be tested is A, and the distance between the two sets of tension rod assemblies (5) and the end connected to the crossbeam (6) is B. Then A < B. The intersection of the extended centerlines of the two sets of tension bar assemblies (5) is higher than the axis of the rolling bearing (2) under test. The bearing adapter assembly (4) includes an upper bearing adapter assembly for connecting the tension rod assembly (5) and the crossbeam (6) and a lower bearing adapter assembly for connecting the tension rod assembly (5) and the bearing seat (1). The tension rod assembly (5) includes a tension rod (501) fixed to the lower bearing adapter assembly, a force sensor (503) fixed to the upper bearing adapter assembly, and a sensor adapter plate (502) for connecting the tension rod (501) and the force sensor (503). The guide assembly includes a base (11), a loading rod assembly (9) disposed on the base (11) for providing an upward force to the crossbeam (6), a guide seat (8) connected to the base (11), and a top plate (7) fixedly connected to the upper side of the guide seat (8). The guide seat (8) has a groove for placing the crossbeam (6). The crossbeam (6) moves up and down in the groove under the action of the loading rod assembly (9). The inner side of the groove has a guide groove for limiting the horizontal position of the crossbeam (6).

2. The rolling bearing friction torque measuring device according to claim 1, characterized in that, The side of the crossbeam (6) is provided with a guide surface that cooperates with the guide assembly.

3. The rolling bearing friction torque measuring device according to claim 1, characterized in that, The bearing adapter assembly (4) includes a short shaft (403) fixed to the bearing housing (1) or the crossbeam (6), a bearing (402) sleeved on the short shaft (403), an adapter seat (401) for fixing the bearing (402), and a cotter pin (404) for fixing the short shaft (403).

4. The rolling bearing friction torque measuring device according to claim 1, characterized in that, A diaphragm (10) for sealing is provided between the base (11) and the loading rod assembly (9).

5. The rolling bearing friction torque measuring device according to claim 1, characterized in that, The measuring device also includes a housing (3) for fixing the measuring device.

6. The rolling bearing friction torque measuring device according to claim 1, characterized in that, The loading rod assembly (9) includes a loading guide seat (901) fixedly connected to the base (11), a loading piston (902) passing through the central through hole of the loading guide seat (901), and a loading rod (903) connected to the loading piston (902). The ball head at the top of the loading rod (903) contacts the crossbeam (6).

7. The rolling bearing friction torque measuring device according to claim 1, characterized in that, The base (11) is provided with a cavity for containing high-pressure oil, which is used to provide an upward force to the loading rod assembly (9).

8. The rolling bearing friction torque measuring device according to claim 7, characterized in that, The base (11) is also provided with a pipe joint (13) for connecting the hydraulic loading device.

9. The rolling bearing friction torque measuring device according to claim 1, characterized in that, The distance between the extended centerline of the two sets of tension rod assemblies (5) and the centerline of the rolling bearing (2) to be tested is 5mm.

Images