A transmission fatigue tester

Abstract

The application belongs to the technical field of fatigue test, and particularly relates to a transmission fatigue tester. The supporting seat is fixed to the upper surface of the bearing frame. The transmission sleeve is fixed to the side surface of the supporting seat. One end of the pull rod assembly is fixedly connected with one side of the double-ear structure of the transmission, and the other end is connected with the transmission connecting unit. One end of the driving unit is vertically connected with one end of the transmission connecting unit, and the other end is fixed in the bearing frame. The positioning unit is located above the driving unit, is fixed to the upper surface of the bearing frame, and is used for keeping the consistency of the load transmission direction of the driving unit and the transmission connecting unit. One end of the transmission connecting unit is vertically connected with the driving unit, and the other end is connected with the pull rod assembly through the positioning unit. The control system is in communication control connection with the driving unit, and the driving unit applies fatigue load to the double-ear structure of the transmission through the transmission connecting unit and the pull rod assembly in closed loop control.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fatigue test, and particularly relates to a transmission fatigue tester. BACKGROUND

[0002] At present, a series of tests need to be carried out on many aviation products before delivery or after repair to ensure the use requirements of the products. According to technical documents, in order to examine the fatigue life of a transmission device and evaluate the influence of hardness on the fatigue life of the transmission device, the transmission device fatigue test needs to be carried out. The transmission device (see Figure 1 ) is provided with two pairs of lugs, one side lug is examined each time, the distance between the action center of the test load F and the central axis of the lug to be examined is L1, the distance between the action center and the plane passing through the central axes of the two pairs of lugs is L2, the direction of the test load is parallel to the plane passing through the central axes of the two pairs of lugs and is perpendicular to the horizontal plane, the test load is tensile or compressive force, and the test times are several million times. At present, there is no such tester. SUMMARY

[0003] The purpose of the present application is to provide a transmission fatigue tester, which can realize the technical requirements of the aviation transmission fatigue test and load the two pairs of lugs at different positions of the transmission device with step-by-step loads to examine the fatigue life of the transmission device.

[0004] The technical scheme of the present application is as follows: in order to realize the above purpose, a transmission fatigue tester is provided, the test piece is a transmission device, the transmission device is in the form of a ring, and two pairs of lugs are symmetrically extended along the two sides of the circumference; the tester comprises a pull rod assembly 9, a supporting seat 13, a force bearing frame 14, a driving unit, a transmission connection unit, a positioning unit and a control system.

[0005] The supporting seat 13 is fixed to the upper surface of the force bearing frame 14, the transmission device is fixed to the side surface of the supporting seat 13, one end of the pull rod assembly 9 is fixedly connected with one side of the two pairs of lugs of the transmission device, and the other end is connected with the transmission connection unit; one end of the driving unit vertically penetrates through the force bearing frame 14 and is vertically connected with one end of the transmission connection unit, and the other end is fixed in the force bearing frame 14; the positioning unit is located directly above the driving unit and is fixed to the upper surface of the force bearing frame 14, and is used for keeping the consistency of the load transmission directions of the driving unit and the transmission connection unit; one end of the transmission connection unit is vertically connected with the driving unit, and the other end penetrates through the positioning unit and is connected with the pull rod assembly 9; the control system is in communication control connection with the driving unit, and the driving unit is closed-loop controlled to apply fatigue load to the two pairs of lugs of the transmission device through the transmission connection unit and the pull rod assembly 9.

[0006] In a possible embodiment, the driving unit comprises a connecting piece 17, a connecting disc 18, an oil cylinder 19, and a sensor 20; one end of the oil cylinder 19 is an output end, and the other end is a fixed end, which is fixedly connected to the inner bottom of the force bearing frame 14; the output end is connected to one end of the connecting piece 17 through the connecting disc 18, and the other end of the connecting piece 17 is connected to the lower end of the sensor 20.

[0007] In a possible embodiment, the transmission connection unit comprises an adapter 2, a sleeve 5, a pull rod sleeve 6, and a shaft pin 7; the lower end of the adapter 2 is connected to the upper end of the sensor 20, and the upper end thereof passes through the center of the positioning unit and is connected to the lower end of the sleeve 5 in a perpendicular manner; the pull rod assembly 9 and the pull rod sleeve 6 are sequentially arranged on the sleeve 5, and the shaft pin 7 sequentially passes through the pull rod sleeve 6, the pull rod assembly, and the sleeve 5 to be connected in a cooperative manner.

[0008] In a possible embodiment, the positioning unit comprises a positioning sheet 1, a small block 15, and a pad block 16; the pad block 16 is arranged below both sides of the positioning sheet 1 and is fixedly connected to the upper surface of the force bearing frame 14; the small block 15 is arranged above the pad block 16 and is fixedly connected to the pad block 16; the positioning sheet 1 is provided with a positioning hole in the center thereof, and both ends of the positioning hole are fixedly connected to the small blocks 15.

[0009] In a possible embodiment, the number of the positioning units is two, and the two positioning units are arranged in a crossed manner at a certain angle; the positioning holes of the positioning sheets 1 of the two positioning units are concentrically overlapped.

[0010] In a possible embodiment, the pull rod assembly 9 comprises a pull block 21, a fork 22, and a joint bearing 23; one end of the fork 22 is provided with a forked end, and the other end is provided with a bearing hole in the center thereof, and the joint bearing 23 is arranged in the bearing hole; the pull block 21 is provided with vertical through holes at both ends thereof, one end of the pull block 21 is inserted between the double lug structures of one side of the transmission device, and the other end of the pull block 21 is connected to the forked end of the fork 22 through a bolt; one end of the fork 22, on which the joint bearing 23 is arranged, is inserted into the pull rod sleeve 6 in a transverse manner, and the shaft pin 7 passes through the joint bearing 23 to realize the mutual connection between the pull rod assembly 9 and the transmission connection unit.

[0011] In a possible embodiment, the fork 22 in the pull rod assembly 9 is at a certain angle with the pull block 21.

[0012] In a possible embodiment, the pull block 21 is also at a certain angle with the transmission device.

[0013] Compared with the prior art, the present application has the following advantages:

[0014] The transmission fatigue tester of the present application adopts a closed load bearing mechanism, which is stable and reliable, and meets the load bearing requirements. The loading position is positioned by a positioning sheet, and the oil cylinder is vertically fixed to the loading position of the test support platform.

[0015] The tester can simulate the actual working state of the transmission under load, ensuring the safety of the transmission test.

[0016] The tester is stable, highly reliable, durable, and easy to disassemble and assemble. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the transmission to be tested in the preferred embodiment of the present application;

[0018] Figure 2 is a front view of a transmission fatigue tester according to the preferred embodiment of the present application;

[0019] Figure 3 is a front view of Figure 2 ;

[0020] Figure 4 is a front view of a sleeve according to the preferred embodiment of the present application;

[0021] Figure 5 is a front view of a pull rod sleeve according to the preferred embodiment of the present application;

[0022] Figure 6 is an A-A view of the pull rod sleeve according to the preferred embodiment of the present application;

[0023] Figure 7 is a top view of the pull rod sleeve according to the preferred embodiment of the present application;

[0024] Figure 8 is a front view of a shaft pin according to the preferred embodiment of the present application;

[0025] Figure 9 is a front view of a pull rod assembly according to the preferred embodiment of the present application;

[0026] Figure 10 is a front view of the pull rod assembly according to the preferred embodiment of the present application;

[0027] Figure 11 is a schematic diagram of a positioning sheet according to the preferred embodiment of the present application;

[0028] Figure 12 is a front view of a connecting piece according to the preferred embodiment of the present application;

[0029] Figure 13 is a front view of a small block according to the preferred embodiment of the present application;

[0030] Figure 14 A view of the small support block according to a preferred embodiment of the present invention;

[0031] Figure 15 This is a front view of the connector according to a preferred embodiment of the present invention;

[0032] in:

[0033] 1. Positioning plate 2. Adapter 3. Square washer 4. Nut

[0034] 5. Sleeve 6. Tie rod sleeve 7. Shaft pin 8. Hex nut

[0035] 9. Tie rod assembly 10. Connecting bolt 11. Fastening bolt 12. Transmission device

[0036] 13. Support base 14. Support frame 15. Small support block 16. Pad block

[0037] 17. Connector 18. Connecting plate 19. Hydraulic cylinder 20. Sensor Detailed Implementation

[0038] To further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention and not for limiting the claims of the present invention.

[0039] like Figure 2 , Figure 3 As shown, a fatigue testing apparatus for a transmission device comprises a positioning plate 1, an adapter 2, a square washer 3, a nut 4, a sleeve 5, a tie rod sleeve 6, a shaft pin 7, a hexagonal nut 8, a tie rod assembly 9, a connecting bolt 10, a fastening bolt 11, a transmission device 12, a support seat 13, a load-bearing frame 14, a small support block 15, a pad block 16, a connector 17, a connecting plate 18, a hydraulic cylinder 19, and a sensor 20.

[0040] The transmission device 12 is fixed to the support seat 13 by bolts and installed on the load-bearing frame 14. The hydraulic cylinder 19 is installed on the load-bearing frame 14 through the connecting plate 18. The hydraulic cylinder is connected to the connecting part 17, the sensor 20, and the adapter 2. The positioning plate 1 and the square pad 3 are stacked on the cylindrical part of the upper and lower sections of the adapter 2 through the central through hole and fixed with the nut 4. The pad 16 and the lower through hole of the small support block 15 are fixed to the load-bearing frame 14 by bolts. The two ends of the positioning plate 1 are fixed to the upper thread of the small support block 15 by bolts. The upper front section of the adapter 2 is externally threaded to the lower internal thread of the sleeve 5, and the upper external thread of the sleeve 5 is externally threaded to the lower internal thread of the tie rod sleeve 6. The tie rod assembly 9 is connected to the central axis of the lug of the transmission device 12 by fastening bolts 11. The tie rod assembly 9 is connected to the joint bearing 23 (e.g., Figure 9One end of the pin extends into the tie rod sleeve 6, and the shaft pin 7 is inserted into the joint bearing hole of the tie rod assembly 9 and the central hole inside the sleeve 5 through the tie rod sleeve 6, and is fixed to the upper part of the tie rod sleeve 6 by the hexagonal nut 8.

[0041] Sleeve 5 has a columnar structure (such as...) Figure 4 As shown), the upper part is tapered, with a through hole in the center of the tapered part; the middle part is provided with external threads; the lower part is hexagonal, with an internal threaded hole in the center of the lower middle part of the sleeve 5, and the center line of the internal threaded hole and the center line of the upper through hole are on the same axis.

[0042] Pull rod sleeve 6 (e.g.) Figure 5 , Figure 6 , Figure 7 As shown), the upper part is set as a cuboid, the interior of which is hollow, and an internal threaded hole is set at the center of the upper end; the lower end is set as a hexagonal head, and an internal threaded hole is set at the center. The center of the internal threaded hole at the lower end and the center line of the internal threaded hole at the upper end are on the same axis, and the internal thread at the lower end of the pull rod sleeve 6 is matched and connected with the external thread in the middle of the sleeve 5.

[0043] Shaft pin 7 (e.g.) Figure 8 The upper end of the sleeve 5 is set with a hexagonal head, and the middle part is set with an external thread. The external thread matches and connects with the upper internal thread of the sleeve 5. The lower part of the shaft pin 7 is set with a cylindrical pin. The diameter of the cylindrical pin is the same as the hole diameter of the ball bearing 23 of the pull rod assembly 9 and the inner circle hole at the center of the upper end of the sleeve 5. The lower cylindrical pin of the shaft pin 7 is inserted into the hole of the ball bearing 23 of the pull rod assembly 9 and the inner circle at the center of the upper end of the sleeve 5 through the upper internal thread hole of the pull rod sleeve 6, and is fixed by the nut 4.

[0044] Pull rod assembly 9 (e.g.) Figure 9 , Figure 10 (As shown) It consists of a pull block 21 and a fork 22. The pull block 21 is a cuboid with internal through holes at both ends. One end of the fork 22 is equipped with a spherical bearing 23, and the other end has two parallel forks. The parallel surfaces of the two forks are respectively provided with through holes of the same diameter. The centers of the two through holes are on the same axis and match the through hole at one end of the pull block 21. They are fixed by connecting bolts 10.

[0045] Positioning piece 1 (e.g.) Figure 11 As shown, it is a rectangular thin iron sheet with a through hole in the center and two through holes at each end of the positioning piece 1.

[0046] Adapter 2 (e.g.) Figure 12 The structure shown is cylindrical, with an external thread at the front upper section that mates with the internal thread at the bottom of the sleeve 5. The rear upper section is cylindrical, with the outer diameter of the cylinder being the same as the central through-hole diameter of the square pad 3 and the central through-hole diameter of the positioning piece, and their center lines being on the same axis (e.g., ...). Figure 3The middle part is a hexagonal block; the lower part is an external thread, which matches the upper internal thread of the sensor.

[0047] Small support block 15 (e.g.) Figure 13 , Figure 14 The structure shown is Z-shaped, with two threaded holes on the upper plane. The threaded holes are matched with two through holes at both ends of the positioning piece 1 and are fixed by bolts; a through hole is provided on the lower plane.

[0048] The pad 16 is a cylinder with a through hole in the center. The through hole matches the through hole on the lower plane of the small support block 15 and is fixed to the support frame 14 by bolts.

[0049] Connector 17 (e.g.) Figure 15 The cylinder (as shown) has an external thread at the top, which matches the internal thread at the top of the sensor; and an internal thread at the center of the bottom, which matches the outer diameter of the piston rod of the oil cylinder.

[0050] When using this invention, as Figure 3 , Figure 4 As shown, the transmission device 12 is fixed to the support seat 13 by bolts and installed on the load-bearing frame 14. The hydraulic cylinder 19 is installed on the load-bearing frame 14 through the connecting plate 18. The hydraulic cylinder is connected to the connecting piece 17, the sensor 20, and the adapter 2. The positioning piece 1 and the square pad 3 are stacked on the cylindrical part of the upper and lower sections of the adapter 2 through the central through hole and fixed by the nut 4. The pad 16 and the lower through hole of the small support block 15 are fixed to the load-bearing frame 14 by bolts. The two ends of the positioning piece 1 are fixed to the upper thread of the small support block 15 by bolts. The upper front section of the adapter 2 is externally threaded to the lower internal thread of the sleeve 5, and the upper external thread of the sleeve 5 is connected to the lower internal thread of the tie rod sleeve 6. The tie rod assembly 9 is connected to the central axis of the lug of the transmission device 12 by fastening bolts 11. The tie rod assembly 9 is connected to the joint bearing 23 (e.g., Figure 9 One end of the pin 7 extends into the tie rod sleeve 6. The pin 7 is inserted into the spherical bearing hole of the tie rod assembly 9 and the central hole inside the sleeve 5 through the tie rod sleeve 6, and is fixed to the upper part of the tie rod sleeve 6 by the hexagonal nut 8. Connect the sensor line, servo valve line, and substation line. The motor drives the oil pump to transmit high-pressure oil through the high-pressure oil pipe to the hydraulic distribution device. Through the oil cylinder 19, connector 17, sensor 20, adapter 2, sleeve 5, tie rod sleeve 6, and tie rod assembly 9, the load is transmitted to the transmission device. At this time, the sensor feeds back the force signal to the control system, and the control system performs closed-loop control of the load. The control system applies load to the lug of the transmission device step by step until the lug of the transmission device breaks.

[0051] Switch the lug on the other side of the transmission device to the test position, and complete the fatigue test of the lug on the other side of the transmission device as described above.

Claims

1. A fatigue testing apparatus for a transmission device, characterized in that, The test piece is a transmission device, which is ring-shaped with symmetrical double-ear structures extending along both sides of the circumference. The testing apparatus includes: a tie rod assembly, a support base, a load-bearing frame, a drive unit, a transmission connection unit, a positioning unit, and a control system. The support base is fixed to the upper surface of the load-bearing frame. The transmission device is fitted and fixed to the side of the support base. One end of the tie rod assembly is fixedly connected to one side of the double-ear structure of the transmission device, and the other end is connected to the transmission connection unit. One end of the drive unit passes perpendicularly through the load-bearing frame and is perpendicularly connected to one end of the transmission connection unit, while the other end is fixed inside the load-bearing frame. The positioning unit is located directly above the drive unit and fixed to the upper surface of the load-bearing frame to maintain the consistency of the load transmission direction between the drive unit and the transmission connection unit. One end of the transmission connection unit is perpendicularly connected to the drive unit, and the other end passes through the positioning unit and connects to the tie rod assembly. The components are connected; the control system is communicatively connected to the drive unit, and the closed-loop control of the drive unit applies fatigue load to the double-ear structure of the transmission device through the transmission connection unit and the tie rod assembly; the drive unit includes a connector, a connecting plate, a hydraulic cylinder, and a sensor; one end of the hydraulic cylinder is an output end and the other end is a fixed end, the fixed end is fixedly connected to the bottom of the inner frame, the output end is connected to one end of the connector through the connecting plate, and the other end of the connector is connected to the lower end of the sensor; the transmission connection unit includes an adapter, a sleeve, a tie rod sleeve, and a pin; the lower end of the adapter is connected to the upper end of the sensor, and its upper end passes through the center of the positioning unit and is perpendicularly connected to the lower end of the sleeve; the tie rod assembly and the end connected to the transmission unit, as well as the tie rod sleeve, are sequentially arranged on the sleeve, and the pin sequentially passes through the tie rod sleeve, and the tie rod assembly is connected to the sleeve.

2. The fatigue testing apparatus for a transmission device according to claim 1, characterized in that, The positioning unit includes a positioning piece, a small support block, and a pad block; the pad block is disposed on both sides below the positioning piece and is fixedly connected to the upper surface of the support frame; the small support block is disposed above the pad block and is fixedly connected to the pad block; the positioning piece has a positioning hole in the center and its two ends are fixedly connected to the small support block respectively.

3. The fatigue testing apparatus for a transmission device according to claim 1, characterized in that, The number of positioning units is two, and the two positioning units are arranged at a certain angle to each other, with the positioning holes of the positioning pieces in the two positioning units overlapping concentrically.

4. The fatigue testing apparatus for a transmission device according to claim 1, characterized in that, The pull rod assembly includes a pull block, a fork, and a spherical bearing. One end of the fork has an open fork, and the other end has a bearing hole in the center, where the spherical bearing is installed. The pull block has vertical through holes at both ends. One end of the pull block is inserted between the double-ear structure on one side of the transmission device and connected to the transmission device by bolts. The other end of the pull block is connected to the open fork of the fork by bolts. The end of the fork with the spherical bearing is inserted laterally into the pull rod sleeve, and the pin passes through the spherical bearing to realize the mutual connection between the pull rod assembly and the transmission connection unit.

5. A fatigue testing apparatus for a transmission device according to claim 4, characterized in that, The fork in the pull rod assembly is at a certain angle to the pull block.

6. A fatigue testing apparatus for a transmission device according to claim 4, characterized in that, The pull block and the transmission device are also at a certain angle.

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