A bearing axial force testing device with sealing structure suitable for high-speed bearing
By designing a bearing axial force testing device with a sealed structure suitable for high-speed bearings, the problem of difficulty in measuring bearing axial force in existing technologies has been solved, enabling accurate measurement of bearing axial force at high speeds and supporting the optimization of aero-engine design parameters.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 中国航发南京航空动力有限责任公司
- Filing Date
- 2026-06-23
- Publication Date
- 2026-07-21
AI Technical Summary
Existing technologies are insufficient for effectively testing the axial force of high-speed bearings during aero-engine operation, which affects the design optimization of aero-engines.
A bearing axial force testing device with a sealed structure suitable for high-speed bearings was designed, including an elastic support, angular locating pin, bearing, force measuring ring, oil injection ring, nut, locking ring, bushing, friction ring, and graphite sealing box. Through the precise matching of these components, the axial force of the bearing can be stably measured at high speeds.
It enables accurate measurement of bearing axial force at high speeds, supporting the optimization and improvement of aero-engine design parameters.
Smart Images
Figure CN122429973A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of aero-engine technology, specifically to a bearing axial force testing device with a sealed structure suitable for high-speed bearings. Background Technology
[0002] With the application and technological development of aero-engine bearings, the design and manufacturing levels of bearings are constantly improving. Consequently, the application scope, scenarios, and operating conditions of bearings are becoming increasingly widespread. Among them, the application environment of high-speed bearings and the loads they bear during operation have always been important research topics in aero-engines. Obtaining the loads on high-speed bearings during aero-engine operation and their real-time changes through testing, and continuously refining the bearing design parameters, is crucial for the development of aero-engines. Therefore, a bearing axial force testing device with a sealed structure suitable for high-speed bearings is needed. Summary of the Invention
[0003] The purpose of this invention is to provide a bearing axial force testing device with a sealed structure suitable for high-speed bearings.
[0004] The bearing axial force testing device with a sealed structure suitable for high-speed bearings mainly consists of an elastic support, angular positioning pin, bearing, force measuring ring, oil injection ring, nut, locking ring, bushing, friction ring, and graphite sealing box structure.
[0005] The aforementioned elastic support is a squirrel-cage type, capable of simultaneously accommodating bearings and force-measuring rings without interfering with its external bushings. A Φ2.5mm diameter angular locating pin hole is provided at the bearing mounting location on the elastic support for mounting an angular locating pin, preventing the outer ring of the bearing from rotating during operation when the bearing is installed in the elastic support. A Φ2.5mm diameter radial lead-in hole is provided at the mounting edge of the force-measuring ring for leading the lead wire from the force-measuring ring out of the elastic support. The structural design of the elastic support ensures that the axial position of the bearing remains unchanged, i.e., the fulcrum position remains unchanged, ensuring that the rotor dynamics of the rotor system do not change.
[0006] The bearing operates at a speed of 33,000 r / min. 1 mm of base material is removed axially from its outer ring, creating space for mounting a force-measuring ring. Simultaneously, a waist-shaped countersunk hole with a width of 3.5 mm, an axial length of 3.9 mm, a radius of R1.75, and a depth of 1.2 mm is cut into the axial outer ring for mounting an angular locating pin. This prevents the bearing's outer ring from rotating while ensuring the bearing can move freely axially under axial force, allowing the force-measuring ring to detect the axial load.
[0007] The force-measuring ring is 4mm thick, with an outer diameter of Φ47mm and an inner diameter of Φ40mm. It has six bosses on each side and two lead-in holes. Strain gauges are attached to the force-measuring ring, and test leads are led out from the lead-in holes. The test leads ultimately exit the engine casing and are connected to the dynamic signal acquisition system to measure the real-time axial force of the bearing.
[0008] The angular locating pin has a diameter of Φ2.5mm and mates with the holes on the bearing and the elastic support to prevent the outer ring of the bearing from rotating circumferentially during operation.
[0009] The bushing is matched with the elastic support, ensuring that while the elastic support is installed inside, there is still an axial clearance of 0.93-1.42mm between them, so that it does not interfere with the elastic support inside.
[0010] The friction ring and graphite sealing box are used together to form a graphite sealing device. This graphite sealing device is used to seal the lubricating oil and prevent it from entering the airflow channel. The graphite sealing device includes a graphite sealing box and a friction ring structure. The graphite sealing box consists of an outer ring, an inner ring, a rubber ring, and a wave spring. The friction ring has a counter-current pumping spiral groove structure to prevent lubricating oil leakage.
[0011] The oil injection ring has an oil injection angle of 52°, which allows the lubricating oil to be directly injected into the bearing cage, ensuring sufficient lubrication of the bearing and ensuring safe operation of the bearing during the test.
[0012] The nuts and locking rings are used to assemble bearings, oil injection rings, and force-measuring rings. The nuts and locking rings should not be fully tightened, ensuring that the force-measuring ring and bearing can move freely axially (approximately 0.1 mm). The second gap between the bearing and the elastic support is 0.02–0.03 mm, and the third gap between the force-measuring ring and the elastic support is 0.05–0.07 mm. These gaps ensure that the bearing and the force-measuring ring can move freely axially under axial force, guaranteeing that the force-measuring ring can measure the axial load. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of a bearing axial force testing device with a sealed structure suitable for high-speed bearings; Figure 2 This is a schematic diagram of an elastic support; Figure 3 This is a schematic diagram of a bearing; Figure 4 This is a schematic diagram of a force-measuring ring; Figure 5 This is a schematic diagram of an angular locating pin; Figure 6 This is a schematic diagram of the assembly of the bushing and the elastic support; Figure 7This is a schematic diagram of the friction ring and the graphite sealing box; Figure 8 This is a schematic diagram of the fuel injection ring; Figure 9 This is a schematic diagram of the fit between the bearing and the elastic support; In the diagram, the components are: 1. Elastic support; 2. Bushing; 3. Nut; 4. Locking ring; 5. Oil injection ring; 6. Angular positioning pin; 7. Force measuring ring; 8. Bearing; 9. Graphite sealing box; 10. Friction ring; 11. Lead wire hole 1; 12. Angular positioning pin hole; 13. Waist-shaped countersunk hole; 14. Lead wire hole 2; 15. Gap 1; 16. Outer ring; 17. Rubber ring; 18. Wave spring; 19. Inner ring; 20. Graphite ring; 22. Oil injection hole; 23. Gap 2; 24. Gap 3. Detailed Implementation
[0014] The present invention will now be described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.
[0015] like Figures 1 to 9 As shown, the bearing axial force testing device with a sealing structure applicable to high-speed bearings involved in this invention mainly consists of an elastic support 1, an angular positioning pin 6, a bearing 8, a force measuring ring 7, an oil injection ring 5, a nut 3, a locking ring 4, a bushing 2, a friction ring 10, and a graphite sealing box 9.
[0016] like Figure 2 As shown, the bearing 8 is mounted on the elastic support with a Φ2.5mm angular locating pin hole 12 for mounting the angular locating pin 6, preventing the outer ring of the bearing 8 from rotating during operation when it is installed in the elastic support 1. A radial lead wire hole 11 with a Φ2.5mm diameter is provided at the mounting edge of the force measuring ring 7 for leading the lead wire from the force measuring ring 7 out of the elastic support 1.
[0017] like Figure 3 As shown, the bearing 8 rotates at 33,000 r / min. 1 mm of base material is removed from its outer ring by axial cutting, and this space is used to install the force measuring ring 7. At the same time, a waist-shaped countersinking hole 13 with a width of 3.5 mm, an axial length of 3.9 mm, a radius of R1.75, and a depth of 1.2 mm is opened on the axial outer ring for installing the angular locating pin 6.
[0018] like Figure 4 As shown, the force-measuring ring 7 has a thickness of 4mm, an outer diameter of Φ47mm, an inner diameter of Φ40mm, six boss structures on each side, and two lead-in holes 14. Strain gauges are attached to the force-measuring ring 7, and test leads are led out from the lead-in holes 14.
[0019] like Figure 5As shown, the angular locating pin 6 has a diameter of Φ2.5mm, and its bearing 8 and the hole on the elastic support 1 are matched to prevent the outer ring of the bearing from rotating circumferentially during operation.
[0020] like Figure 6 As shown, the elastic support 1 is assembled in the bushing 2, and the axial clearance between the bushing 2 and the elastic support 1 is 0.93-1.42mm.
[0021] like Figure 7 As shown, the friction ring 10 and the graphite sealing box 9 are used together to form a graphite sealing device. The graphite sealing box 9 consists of an outer ring 16, a rubber ring 17, a wave spring 18, an inner ring 19, and a graphite ring 20. The friction ring 10 has a counter-current pumping spiral groove structure to prevent lubricating oil leakage.
[0022] like Figure 8 As shown, the angle of the oil injection ring injection hole 22 is 52°, which allows the lubricating oil to be directly injected into the bearing cage.
[0023] like Figure 9 As shown, the second clearance 23 between the bearing 8 and the elastic support 1 is 0.02-0.03 mm, and the third clearance 24 between the force measuring ring 7 and the elastic support 1 is 0.05-0.07 mm. This third clearance ensures that the bearing 8 and the force measuring ring 7 can move freely axially when subjected to axial force, ensuring that the force measuring ring 7 can measure the axial load.
[0024] Nut 3 and locking ring 4 limit the oil injection ring 5, bearing 8 and force measuring ring 7, while not completely locking the oil injection ring 5, bearing 8 and force measuring ring 7, so that the force measuring ring 7 and bearing 8 can move freely within an axial range of 0.1mm. The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.
Claims
1. A bearing axial force testing device with a sealed structure for high-speed bearings, characterized in that, It includes elastic supports, angular locating pins, bearings, force measuring rings, oil injection rings, nuts, locking rings, bushings, friction rings, and graphite sealing boxes.
2. The bearing axial force testing device with a sealing structure suitable for high-speed bearings according to claim 1, characterized in that, The bearing rotates at a speed of 33,000 r / min.
3. The bearing axial force testing device with a sealed structure suitable for high-speed bearings according to claim 2, characterized in that, The elastic support is a squirrel cage type, which can simultaneously equip bearings and force measuring rings without interfering with its external bushings; the bearing mounting location of the elastic support has an angular locating pin hole with a diameter of Φ2.5mm for mounting an angular locating pin to prevent the outer ring of the bearing from rotating during operation after the bearing is installed in the elastic support; a radial lead wire hole with a diameter of Φ2.5mm is opened at the mounting edge of the force measuring ring for leading the lead wire from the force measuring ring out of the elastic support.
4. The bearing axial force testing device with a sealing structure suitable for high-speed bearings according to claim 3, characterized in that, The bearing outer ring is axially cut to remove 1mm of base material, and this space is used to install a force measuring ring; the axial outer ring has a waist-shaped countersink with a width of 3.5mm, an axial length of 3.9mm, and a depth of 1.2mm, for installing an angular locating pin.
5. The bearing axial force testing device with a sealing structure suitable for high-speed bearings according to claim 4, characterized in that, The force-measuring ring structure has a thickness of 4mm, an outer diameter of Φ47mm, an inner diameter of Φ40mm, six protrusions on each side, and two lead holes for leading out test leads.
6. The bearing axial force testing device with a sealed structure suitable for high-speed bearings according to claim 5, characterized in that, The angular locating pin structure has a diameter of Φ2.5mm and mates with holes on the bearing and elastic support to prevent the outer ring of the bearing from rotating circumferentially during operation.
7. The bearing axial force testing device with a sealing structure suitable for high-speed bearings according to claim 6, characterized in that, While the bushing is fitted with an elastic support inside, an axial clearance is left between it and the elastic support to prevent interference with the elastic support inside.
8. The bearing axial force testing device with a sealing structure suitable for high-speed bearings according to claim 7, characterized in that, The friction ring and graphite sealing box are used together to form a graphite sealing device for sealing lubricating oil and preventing it from entering the airflow channel. The graphite sealing device includes a graphite sealing box and a friction ring structure. The graphite sealing box consists of an outer ring, an inner ring, a rubber ring, and a wave spring. The friction ring has a counter-current pumping spiral groove structure.
9. A bearing axial force testing device with a sealing structure suitable for high-speed bearings according to claim 8, characterized in that, The injection angle of the injection ring injection hole is 52°.
10. A bearing axial force testing device with a sealed structure suitable for high-speed bearings according to claim 9, characterized in that, The nut and locking ring limit the oil injection ring, bearing and force measuring ring, while not completely locking the oil injection ring, bearing and force measuring ring, so that the force measuring ring and bearing can move within a range of 0.1mm of axial movement.
11. The bearing axial force testing device with a sealing structure suitable for high-speed bearings according to claim 10, characterized in that, The second gap between the bearing and the elastic support is 0.02-0.03 mm, and the third gap between the force measuring ring and the elastic support is 0.05-0.07 mm.