A bearing testing device

Abstract

This invention belongs to the field of aerospace bearing testing technology and discloses a bearing testing device. Specifically, one end of a central drive shaft is connected to a first drive shaft via a first transmission structure, and a drive motor drives the first drive shaft to rotate, achieving high-speed rotation of the central drive shaft via the first drive shaft. The other end of the central drive shaft is connected to a second drive shaft via a second transmission structure, and a loading motor applies a load to the second drive shaft. If the rotational speed applied to the central drive shaft by the drive motor is the same as the actual operating speed, and the torque load applied to the central drive shaft by the loading motor is also the same as the actual operating torque load, the test bearing mounted on the central drive shaft can withstand the same rotational speed and load during testing as it does during actual operation. This allows for a reasonable evaluation and assessment of the bearing's performance, lifespan, and reliability.

Description

Technical Field

[0001] This invention relates to the field of aerospace bearing testing technology, and specifically to a bearing testing device. Background Technology

[0002] To ensure the normal operation of the aircraft and engine, many accessories with specific power, speed, and steering requirements need to be driven by the engine, such as oil pumps, fuel pumps, hydraulic pumps, and generators. Accessories requiring engine power are mounted on accessory gearboxes, which contain a series of meshing gears. The engine drives the gearbox via bevel gears and a central driveshaft assembly, which then transmits power to all the accessories mounted on it. This assembly of accessories, gear trains, and driveshafts is called the accessory drive system.

[0003] The connection between the accessory drive and the engine rotor is the central drive gear shaft. The bearing supporting the central drive gear shaft is the highest-speed bearing in the accessory drive, with a speed close to that of the engine's gas generator rotor. The reliability and lifespan of this bearing affect the overall performance of the accessory drive. Central drive shaft bearings are mostly mounted vertically on the central drive shaft with a slanted brace, and their stress conditions are relatively complex, including radial loads, axial loads, and bending moment loads from bevel gears. Therefore, existing bearings generally need to undergo testing and verification before being installed in the engine for overall testing. For central drive shaft bearings, existing testing methods involve mounting the bearing on a horizontal shaft and simulating the load generated by bevel gear meshing by applying radial loads using radial cylinders and axial loads using axial cylinders.

[0004] However, by applying radial loads via radial cylinders and axial loads via axial cylinders, the test setup fails to simulate the bending moment load applied by bevel gears. This makes it difficult to simulate the actual installation conditions of the bearings, resulting in inaccurate speeds and loads measured during the test. Consequently, the verification process for bearing testing is insufficient, leading to unreasonable evaluation results for the performance, lifespan, and reliability of this type of bearing. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is that the existing test device does not simulate the bending moment load applied by the bevel gear, making it difficult to simulate the actual installation of the bearing, resulting in unreasonable evaluation results of the performance, life and reliability of this type of bearing.

[0006] Therefore, the present invention provides a bearing testing apparatus, comprising:

[0007] The testing mechanism includes a housing body and a first loading inlet and a second loading inlet respectively disposed on both sides of the housing body. The housing body is provided with a central drive shaft, a first drive shaft and a second drive shaft. The central drive shaft is rotatably mounted in the housing body, and a test bearing and a test bearing are respectively installed at both ends of the central drive shaft. One end of the central drive shaft is connected to the first drive shaft through a first transmission structure so that the rotation of the first drive shaft can drive the rotation of the central drive shaft. The first drive shaft extends out of the first loading inlet. The other end of the central drive shaft is connected to the second drive shaft through a second transmission structure so that the rotation of the central drive shaft can drive the rotation of the second drive shaft. The second drive shaft extends out of the second loading inlet.

[0008] A drive motor, wherein the motor shaft of the drive motor is connected to one end of the first drive shaft that extends out of the first loading inlet;

[0009] A loading motor is provided, wherein the motor shaft of the loading motor is connected to one end of the second drive shaft that extends out of the second loading inlet.

[0010] Optionally, the above-mentioned bearing testing apparatus,

[0011] The first transmission structure includes a first bevel gear and a second bevel gear. The first bevel gear is fixedly disposed at one end of the central transmission shaft, and the second bevel gear is fixedly disposed at the end of the first drive shaft away from the drive motor.

[0012] Optionally, the above-mentioned bearing testing apparatus,

[0013] The second transmission structure includes a third bevel gear and a fourth bevel gear. The third bevel gear is fixedly disposed at the other end of the central transmission shaft, and the fourth bevel gear is fixedly disposed at the end of the second drive shaft away from the loading motor.

[0014] Optionally, the above-mentioned bearing testing apparatus,

[0015] It also includes a speed increaser, the input end of which is connected to the motor shaft of the drive motor via a coupling, and the output end of which is connected to the end of the first drive shaft away from the first bevel gear via a coupling.

[0016] Optionally, the above-mentioned bearing testing apparatus,

[0017] It also includes a speed reducer, the input end of which is connected to the motor shaft of the loading motor via a coupling, and the output end of which is connected to the end of the second drive shaft away from the second bevel gear via a coupling.

[0018] Optionally, the above-mentioned bearing testing apparatus,

[0019] It also includes a speed detection element, which is disposed between the test mechanism and the reducer.

[0020] Optionally, the above-mentioned bearing testing apparatus,

[0021] The speed detection device is a torque sensor. The input end of the torque sensor is connected to the output end of the reducer through a coupling. The output end of the torque sensor is connected to the end of the second drive shaft away from the second bevel gear through a coupling.

[0022] Optionally, the above-mentioned bearing testing apparatus,

[0023] It also includes a testing platform;

[0024] The housing body is mounted above the test platform.

[0025] Optionally, the above-mentioned bearing testing apparatus,

[0026] It also includes a mounting base, which is disposed along the height direction between the test platform and the housing body.

[0027] Optionally, the above-mentioned bearing testing apparatus,

[0028] The second loading inlet is positioned above the first loading inlet along the height direction;

[0029] The test bearing is positioned near the first loading inlet.

[0030] The technical solution provided by this invention has the following advantages:

[0031] The bearing testing apparatus provided by this invention includes a testing mechanism, a drive motor, and a loading motor. The testing mechanism includes a housing body and a first loading inlet and a second loading inlet respectively disposed on both sides of the housing body. Inside the housing body are a central drive shaft, a first drive shaft, and a second drive shaft. The central drive shaft is rotatably mounted within the housing body, and a test bearing and a test bearing are respectively mounted at its two ends. One end of the central drive shaft is connected to the first drive shaft via a first transmission structure, so that rotation of the first drive shaft can drive rotation of the central drive shaft. The first drive shaft extends through the first loading inlet. The other end of the central drive shaft is connected to the second drive shaft via a second transmission structure, so that rotation of the central drive shaft can drive rotation of the second drive shaft. The second drive shaft extends through the second loading inlet. The motor shaft of the drive motor is connected to the end of the first drive shaft extending through the first loading inlet. The motor shaft of the loading motor is connected to the end of the second drive shaft extending through the second loading inlet.

[0032] This bearing testing device connects one end of a central drive shaft to a first drive shaft via a first transmission structure, and uses a drive motor to rotate the first drive shaft, enabling the drive motor to drive the central drive shaft to rotate at high speed. The other end of the central drive shaft is connected to a second drive shaft via a second transmission structure, and a loading motor applies a load to the second drive shaft. If the speed applied to the central drive shaft by the drive motor is the same as the actual operating speed, and the torque load applied to the central drive shaft by the loading motor is also the same as the actual operating torque load, the test bearing mounted on the central drive shaft will experience the same speed and load during testing as it does during actual operation. This allows for a reasonable evaluation and assessment of the bearing's performance, lifespan, and reliability. Attached Figure Description

[0033] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the bearing testing device provided by the present invention;

[0035] Figure 2 This is a schematic diagram of the testing mechanism in the bearing testing device provided by the present invention;

[0036] Explanation of reference numerals in the attached figures:

[0037] 1-Testing mechanism; 111-Housing body; 112-First loading inlet; 113-Second loading inlet; 114-Central drive shaft; 115-First drive shaft; 116-Second drive shaft; 117-Test bearing; 118-Supplementary bearing;

[0038] 2-First transmission structure; 211-First bevel gear; 212-Second bevel gear;

[0039] 3-Second transmission structure; 311-Third bevel gear; 312-Fourth bevel gear;

[0040] 4-Drive motor;

[0041] 5-Load the motor;

[0042] 61-Increaser; 62-Reducer;

[0043] 7-Coupling;

[0044] 8-Speed ​​detection element;

[0045] 91-Test platform; 92-Mounting base. Detailed Implementation

[0046] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0049] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0050] Example 1

[0051] This embodiment provides a bearing testing device, such as... Figure 1 and Figure 2 As shown, the device includes a testing mechanism 1, a drive motor 4, and a loading motor 5. The testing mechanism 1 includes a housing body 111 and a first loading inlet 112 and a second loading inlet 113 respectively located on both sides of the housing body 111. Inside the housing body 111 are a central drive shaft 114, a first drive shaft 115, and a second drive shaft 116. The central drive shaft 114 is rotatably mounted inside the housing body 111, and test bearings 117 and auxiliary bearings 118 are respectively installed at both ends of the central drive shaft 114. One end of the central drive shaft 114 is connected to the first drive shaft 115 via a first transmission structure 2, allowing the rotation of the first drive shaft 115 to be controlled. The rotation of the central drive shaft 114 is driven by the first drive shaft 115, which extends through the first loading inlet 112. The other end of the central drive shaft 114 is connected to the second drive shaft 116 via the second transmission structure 3, so that the rotation of the central drive shaft 114 can drive the rotation of the second drive shaft 116. The second drive shaft 116 extends through the second loading inlet 113. The motor shaft of the drive motor 4 is connected to one end of the first drive shaft 115 extending through the first loading inlet 112. The motor shaft of the loading motor 5 is connected to one end of the second drive shaft 116 extending through the second loading inlet 113.

[0052] This bearing testing device connects one end of the central drive shaft 114 to the first drive shaft 115 via the first transmission structure 2, and uses a drive motor 4 to drive the first drive shaft 115 to rotate, thus enabling the drive motor 4 to drive the central drive shaft 114 to rotate at high speed via the first drive shaft 115. The other end of the central drive shaft 114 is connected to the second drive shaft 116 via the second transmission structure 3, and a loading motor 5 applies a load to the second drive shaft 116. If the speed applied to the central drive shaft 114 by the drive motor 4 is the same as the actual working speed, and the torque load applied to the central drive shaft 114 by the loading motor 5 is also the same as the actual working torque load, the test bearing 117 mounted on the central drive shaft 114 can withstand the same speed and load during the test as it does during actual operation. This allows for a reasonable evaluation and assessment of the performance, lifespan, and reliability of this type of bearing.

[0053] It can be noted that the bearing testing device provided in this embodiment can simulate different working conditions inside the housing body 111, such as the bearing installation method, environmental conditions, lubrication method, etc., which are consistent with the working conditions when actually applied to the engine, so as to further reasonably evaluate and assess the performance, life and reliability of this type of bearing.

[0054] It can be explained that the bearing testing device provided in this embodiment transmits the power and speed of the first drive shaft 115 to the central drive shaft 114 through the first transmission structure 2, and finally transmits the power and speed to the second drive shaft 116 through the second transmission structure 3.

[0055] It can be noted that the shell body 111 provided in this embodiment is made by casting.

[0056] like Figure 1 and Figure 2 As shown, the bearing testing device provided in this embodiment includes a first transmission structure 2 comprising a first bevel gear 211 and a second bevel gear 212. The first bevel gear 211 is fixedly disposed at one end of the central transmission shaft 114, and the second bevel gear 212 is fixedly disposed at the end of the first drive shaft 115 away from the drive motor 4.

[0057] like Figure 1 and Figure 2 As shown, the bearing testing device provided in this embodiment includes a second transmission structure 3 comprising a third bevel gear 311 and a fourth bevel gear 312. The third bevel gear 311 is fixedly disposed at the other end of the central transmission shaft 114, and the fourth bevel gear 312 is fixedly disposed at the end of the second drive shaft 116 away from the loading motor 5.

[0058] It can be noted that in the bearing testing device provided in this embodiment, the loading motor 5 needs to load the entire bearing testing device. In this case, when selecting the loading motor 5, as one implementation method, the loading motor 5 is selected as an AC variable frequency motor. The magnitude of the loading torque is controlled by controlling the output power of the loading motor 5, simulating the torque load on the bevel gear set on the central drive shaft 114 of the engine accessory during actual operation, so that the load on the test bearing 117 is the same as the load during actual operation.

[0059] like Figure 1 and Figure 2 As shown, in the bearing testing device provided in this embodiment, the second loading inlet 113 is arranged above the first loading inlet 112 along the height direction; at this time, the test bearing 117 is arranged close to the first loading inlet 112.

[0060] like Figure 1 As shown, the bearing testing apparatus provided in this embodiment also includes a speed increaser 61. The input end of the speed increaser 61 is connected to the motor shaft of the drive motor 4 via a coupling 7, and the output end of the speed increaser 61 is connected to the end of the first drive shaft 115 away from the first bevel gear 211 via a coupling 7. In this embodiment, by setting the speed increaser 61, the output speed of the drive motor 4 can be increased to the highest speed that the test bearing 117 can withstand, and the power and torque of the drive motor 4 can be transmitted to the central drive shaft 114.

[0061] like Figure 1 As shown, the bearing testing device provided in this embodiment also includes a reducer 62. The input end of the reducer 62 is connected to the motor shaft of the loading motor 5 via a coupling 7, and the output end of the reducer 62 is connected to the end of the second drive shaft 116 away from the second bevel gear 212 via a coupling 7.

[0062] like Figure 1 As shown, the bearing testing device provided in this embodiment also includes a speed detection element 8, which is disposed between the testing mechanism 1 and the reducer 62. In this embodiment, the speed detection element 8 is used to detect the speed and loading torque transmitted from the central drive shaft 114 to the second drive shaft 116. A reducer 62 is disposed between the speed detection element 8 and the loading motor 5 to reduce the speed transmitted from the central drive shaft 114 to the speed of the motor shaft of the loading motor 5.

[0063] In one embodiment, the bearing testing device provided in this example selects a torque sensor when selecting the speed detection component 8. At this time, the input end of the torque sensor is connected to the output end of the reducer 62 through the coupling 7, and the output end of the torque sensor is connected to the end of the second drive shaft 116 away from the second bevel gear 212 through the coupling 7.

[0064] It can be noted that in the above embodiments, a total of five couplings 7 are provided, namely: the coupling 7 between the motor shaft of the drive motor 4 and the input end of the speed increaser 61, and the coupling 7 between the input end of the speed reducer 62 and the motor shaft of the loading motor 5 are all selected as laminated couplings; while the coupling 7 between the output end of the speed increaser 61 and the first drive shaft 115, the coupling 7 between the input end of the torque sensor and the output end of the speed reducer 62, and the coupling 7 between the output end of the torque sensor and the second drive shaft 116 are all selected as high-speed diaphragm couplings.

[0065] It can be noted that in this embodiment, the drive motor 4 is selected as an AC variable frequency motor, which can realize closed-loop control and provide driving force for the entire bearing test device.

[0066] like Figure 1 and Figure 2 As shown, the bearing testing device provided in this embodiment also includes a testing platform 91; at this time, the housing body 111 is installed above the testing platform 91.

[0067] It can be noted that, due to the possibility of inconsistencies in coaxiality and center height among the components, this embodiment should also include a mounting base 92. Multiple mounting bases 92 are provided; in one implementation, a total of six mounting bases 92 are provided. One mounting base 92 is positioned along the height direction between the test platform 91 and the housing body 111. The other five mounting bases 92 are respectively positioned between the drive motor 4 and the test platform 91, between the speed increaser 61 and the test platform 91, between the speed detection element 8 and the test platform 91, between the reducer 62 and the test platform 91, and between the loading motor 5 and the test platform 91. Furthermore, the structure of each mounting base 92 is not limited; it is only necessary to ensure that the coaxiality and center height among the components are consistent after the mounting base 92 is fixedly installed.

[0068] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A bearing testing apparatus, characterized in that, include: The testing mechanism (1) includes a housing body (111) and a first loading inlet (112) and a second loading inlet (113) respectively disposed on both sides of the housing body (111). The housing body (111) is provided with a central drive shaft (114), a first drive shaft (115) and a second drive shaft (116). The central drive shaft (114) is rotatably mounted in the housing body (111), and a test bearing (117) and a test bearing (118) are respectively installed at both ends of the central drive shaft (114). One end of the central drive shaft (114) The first drive shaft (115) is connected to the first drive shaft (115) via a first transmission structure (2) so that the rotation of the first drive shaft (115) can drive the rotation of the central drive shaft (114). The first drive shaft (115) extends out of the first loading inlet (112). The other end of the central drive shaft (114) is connected to the second drive shaft (116) via a second transmission structure (3) so that the rotation of the central drive shaft (114) can drive the rotation of the second drive shaft (116). The second drive shaft (116) extends out of the second loading inlet (113). A drive motor (4) is provided, wherein the motor shaft of the drive motor (4) is connected to one end of the first drive shaft (115) that passes through the first loading inlet (112); Loading motor (5), the motor shaft of the loading motor (5) is connected to one end of the second drive shaft (116) that passes through the second loading inlet (113); in: The first transmission structure (2) includes a first bevel gear (211) and a second bevel gear (212). The first bevel gear (211) is fixedly disposed at one end of the central transmission shaft (114), and the second bevel gear (212) is fixedly disposed at one end of the first drive shaft (115) away from the drive motor (4). The second transmission structure (3) includes a third bevel gear (311) and a fourth bevel gear (312). The third bevel gear (311) is fixedly disposed at the other end of the central transmission shaft (114), and the fourth bevel gear (312) is fixedly disposed at the end of the second drive shaft (116) away from the loading motor (5). The bearing testing apparatus also includes: Speed ​​increaser (61), the input end of the speed increaser (61) is connected to the motor shaft of the drive motor (4) via a coupling (7), and the output end of the speed increaser (61) is connected to the end of the first drive shaft (115) away from the first bevel gear (211) via a coupling (7); The reducer (62) is connected to the motor shaft of the loading motor (5) via a coupling (7) at its input end. A speed detection element (8) is disposed between the test mechanism (1) and the reducer (62). The speed detection element (8) is a torque sensor. The input end of the torque sensor is connected to the output end of the reducer (62) through a coupling (7). The output end of the torque sensor is connected to the end of the second drive shaft (116) away from the second bevel gear (212) through a coupling (7).

2. The bearing testing apparatus according to claim 1, characterized in that, The output end of the reducer (62) is connected to the end of the second drive shaft (116) away from the second bevel gear (212) via a coupling (7).

3. The bearing testing apparatus according to claim 1 or 2, characterized in that, It also includes a test platform (91); The housing body (111) is mounted above the test platform (91).

4. The bearing testing apparatus according to claim 3, characterized in that, It also includes a mounting base (92) disposed along the height direction between the test platform (91) and the housing body (111).

5. The bearing testing apparatus according to claim 1 or 2, characterized in that, The second loading inlet (113) is positioned above the first loading inlet (112) along the height direction; The test bearing (117) is positioned near the first loading inlet (112).

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