Transmission shaft dynamic torsional fatigue test bench

Abstract

The utility model provides a dynamic torsional fatigue test bench for transmission shafts. The dynamic torsional fatigue test bench is mainly used for solving the technical problem that the rotation state of an existing hydraulic torsional actuator is different from that of shaft parts in actual working conditions. The utility model relates to a transmission shaft dynamic torsional fatigue test bench, which comprises a first permanent magnet synchronous motor and a second permanent magnet synchronous motor, and the torque output by the first permanent magnet synchronous motor is transmitted to one end of a shaft to be tested through a torquemeter, a transition flange and a first spline housing in sequence. The other end of the to-be-tested shaft transmits the torque to the second permanent magnet synchronous motor through the second spline housing. The whole test bench is rapidly switched between driving (positive torque) and braking (negative torque). The torque response of the first permanent magnet synchronous motor and the second permanent magnet synchronous motor is fast, the torque response is close to the rotation state of the shaft part in the actual working condition, the torque alternating frequency is high, the test time can be saved, and the research and development period can be shortened.

Description

Technical Field

[0001] This utility model relates to a shaft torsional fatigue strength testing bench, specifically a dynamic torsional fatigue testing bench for transmission shafts. Background Technology

[0002] Pure electric logistics vehicles, buses, sanitation vehicles, and mining trucks have significant advantages in the popularization of pure electric vehicles due to their relatively short transportation distances and low range requirements. During braking in new energy vehicles, the vehicle can recover braking energy back to the battery through an energy recovery system, at which point the motor generates reverse torque. This reverse torque subjectes the transmission system to alternating loads, thus placing higher demands on the torsional fatigue strength of transmission shaft components. Therefore, torsional fatigue strength has become a key indicator for evaluating the durability performance of new energy transmissions.

[0003] Currently, most shaft torsional fatigue strength tests in China employ hydraulic servo drives. This method requires auxiliary equipment such as hydraulic power units, resulting in high costs and energy consumption. Furthermore, oil pumps and hydraulic components pose a significant risk of leakage. During the test, the equipment fixes one end of the shaft component and connects the other end to a torque-applying device, applying forward and reverse loading via a hydraulic torsional actuator. For example, Chinese patent CN104515679A discloses a dynamic torsional fatigue testing device for automotive driveshaft assemblies, which works by applying forward and reverse loading via a hydraulic torsional actuator. However, while the hydraulic torsional actuator can simulate torsional fatigue testing of shaft components, this loading method differs from the rotational state of shaft components under actual working conditions. Utility Model Content

[0004] The purpose of this invention is to solve the technical problem that the rotation state of existing hydraulic torsion actuators differs from that of shaft parts in actual working conditions, and to propose a dynamic torsion fatigue test bench for transmission shafts.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] A dynamic torsional fatigue testing bench for transmission shafts, characterized by:

[0007] It includes a first permanent magnet synchronous motor, a torque meter, a first spline sleeve, a second spline sleeve, a second permanent magnet synchronous motor, a battery simulator, and an iron plate, as well as a first bracket bearing seat and a second bracket bearing seat that are vertically mounted on the iron plate in sequence.

[0008] The first permanent magnet synchronous motor is mounted on the first bracket bearing seat; the electrical interface of the first permanent magnet synchronous motor is connected to the battery simulator, the torque output shaft of the first permanent magnet synchronous motor is connected to the first bearing on the first bracket bearing seat, and the first bearing is also connected to the input end of the torque meter.

[0009] The output end of the torque meter is coaxially connected to the input end of the first spline sleeve, and is used to measure the torque during the test.

[0010] The output end of the first spline sleeve is coaxially connected to one end of the shaft to be tested;

[0011] The second permanent magnet synchronous motor is mounted on the second bracket bearing seat. The electrical interface of the second permanent magnet synchronous motor is connected to the battery simulator. The torque output shaft of the second permanent magnet synchronous motor is connected to the second bearing on the second bracket bearing seat. The second bearing is also coaxially connected to the input end of the second spline sleeve.

[0012] The output end of the second spline sleeve is coaxially connected to the other end of the shaft to be tested.

[0013] Furthermore, it also includes transition flanges;

[0014] One end of the transition flange is connected to the output end of the torque meter, and the other end is connected to the input end of the first spline sleeve.

[0015] Furthermore, it also includes a third bracket bearing housing that is vertically mounted on the iron plate;

[0016] The third support bearing housing is provided with a third bearing and a connecting shaft mounted on the third bearing; one end of the connecting shaft is provided with an internal spline, which is connected to the external spline of the transition flange; the other end is provided with end face teeth, which are engaged with the end face teeth of the input end of the first spline sleeve.

[0017] Furthermore, it also includes an internal gear sleeve; the shaft to be tested includes the main test shaft and the auxiliary test shaft;

[0018] The output end of the first spline sleeve is used to connect to one end of the main test shaft, and the output end of the second spline sleeve is used to connect to one end of the auxiliary test shaft.

[0019] The internal teeth at both ends of the internal gear sleeve mesh with the external teeth at the other end of the main test shaft and the other external teeth at the other end of the auxiliary test shaft, respectively.

[0020] Furthermore, the first permanent magnet synchronous motor and the second permanent magnet synchronous motor have the same structure, and their maximum torque alternating frequency is 10000 Nm / s.

[0021] The beneficial effects of this utility model are:

[0022] 1. This utility model discloses a dynamic torsional fatigue testing bench for transmission shafts, comprising a first permanent magnet synchronous motor and a second permanent magnet synchronous motor. The torque output by the first permanent magnet synchronous motor is sequentially transmitted to one end of the shaft under test through a torque meter, an transition flange, and a first spline sleeve. The other end of the shaft under test transmits the torque to the second permanent magnet synchronous motor through a second spline sleeve. The entire testing bench rapidly switches between driving (positive torque) and braking (negative torque). The torque response of the first and second permanent magnet synchronous motors is relatively fast, closely resembling the rotational state of shaft parts under actual working conditions. Their torque alternation frequency is relatively high, which can save testing time and shorten the development cycle.

[0023] 2. This utility model discloses a dynamic torsional fatigue testing bench for transmission shafts, which can simultaneously mount two samples, a main test shaft and a secondary test shaft, significantly shortening the testing cycle. The internal teeth at both ends of the internal gear sleeve mesh with the main test shaft and the secondary test shaft, respectively.

[0024] 3. This utility model provides a dynamic torsional fatigue testing bench for transmission shafts, which has a simple structure, is easy to install, is movable, highly portable, and widely applicable, and can meet the dynamic torsional fatigue strength test requirements for transmission shafts and reducer assemblies. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of an embodiment of a dynamic torsional fatigue testing bench for transmission shafts according to the present invention.

[0026] 1. First permanent magnet synchronous motor; 2. Torque meter; 3. Transition flange; 4. First spline sleeve; 5. Shaft to be tested; 6. Second spline sleeve; 7. Second permanent magnet synchronous motor; 8. Battery simulator; 9. First bracket bearing seat; 10. Internal gear sleeve; 11. Second bracket bearing seat; 12. Third bracket bearing seat; 13. Iron plate. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] This utility model relates to a dynamic torsional fatigue testing bench for transmission shafts, such as... Figure 1 As shown, it includes a first permanent magnet synchronous motor 1, a torque meter 2, a transition flange 3, a first spline sleeve 4, a second spline sleeve 6, a second permanent magnet synchronous motor 7, a battery simulator 8, an iron plate 13 and an inner gear sleeve 10, as well as a first bracket bearing seat 9, a third bracket bearing seat 12 and a second bracket bearing seat 11 that are vertically mounted on the iron plate 13 in sequence.

[0029] The first permanent magnet synchronous motor 1 and the second permanent magnet synchronous motor 7 are two identical motors. The first permanent magnet synchronous motor 1 is used to control torque, and the second permanent magnet synchronous motor 7 is used to control both torque and speed. The maximum torque alternation frequency of the first permanent magnet synchronous motor 1 and the second permanent magnet synchronous motor 7 is 10000 Nm / s.

[0030] The first permanent magnet synchronous motor 1 is mounted on the first bracket bearing seat 9; the electrical interface of the first permanent magnet synchronous motor 1 is connected to the battery simulator 8, the torque output shaft of the first permanent magnet synchronous motor 1 is connected to the first bearing on the first bracket bearing seat 9, and the first bearing is also connected to the input end of the torque meter 2.

[0031] The output end of the torque meter 2 is coaxially connected to one end of the transition flange 3, and the other end of the transition flange 3 is provided with an external spline. The torque meter 2 is used to measure the torque during the test and compare it with the torque provided by the first permanent magnet synchronous motor 1.

[0032] The third support bearing housing 12 is provided with a third bearing and a connecting shaft mounted on the third bearing; one end of the connecting shaft is provided with an internal spline, which is connected to the external spline of the transition flange 3; the other end is provided with end face teeth, which are used to mesh with the end face teeth of the input end of the first spline sleeve 4.

[0033] The output end of the first spline sleeve 4 is coaxially connected to one end of the shaft 5 to be tested.

[0034] The second permanent magnet synchronous motor 7 is mounted on the second bracket bearing seat 11. The electrical interface of the second permanent magnet synchronous motor 7 is connected to the battery simulator 8. The torque output shaft of the second permanent magnet synchronous motor 7 is connected to the second bearing on the second bracket bearing seat 11. The second bearing is also coaxially connected to the input end of the second spline sleeve 6.

[0035] The output end of the second spline sleeve 6 is coaxially connected to the other end of the shaft to be tested 5.

[0036] The battery simulator 8 provides electrical energy to the first permanent magnet synchronous motor 1 and the second permanent magnet synchronous motor 7, and absorbs the power fed by them, so that the test bench forms an electrically closed system.

[0037] The test shaft 5 includes a main test shaft and a secondary test shaft; installing both the main and secondary test samples at once can greatly shorten the test cycle. The output end of the first spline sleeve 4 is used to connect to one end of the main test shaft, and the output end of the second spline sleeve 6 is used to connect to one end of the secondary test shaft. The internal teeth at both ends of the internal gear sleeve 10 mesh with the external teeth at the other end of the main test shaft and the other end of the secondary test shaft, respectively, to ensure the power transmission efficiency and motion synchronization between them.

[0038] The main test shaft and the auxiliary test shaft are also equipped with retaining rings to limit their axial positions.

[0039] The first permanent magnet synchronous motor 1 is fixed on the first bracket bearing seat 9. The torque output by the first permanent magnet synchronous motor 1 is transmitted to the torque meter 2, and then to the third bracket bearing seat 12 through the transition flange 3. The torque of the third bracket bearing seat 12 is transmitted to the main test shaft through the first spline sleeve 4. The torque of the main test shaft is transmitted to the auxiliary test shaft through the internal gear sleeve 10, and then to the second permanent magnet synchronous motor 7 through the second spline sleeve 6.

[0040] During the test, the first permanent magnet synchronous motor 1 provides alternating torque, and the second permanent magnet synchronous motor 7 synchronously responds to the alternating torque. The entire test bench rapidly switches between driving (positive torque) and braking (negative torque). For example, when simulating driving, the first permanent magnet synchronous motor 1 provides positive torque, converting the electrical energy supplied by the battery simulator 8 into mechanical energy. The second permanent magnet synchronous motor 7 then converts the mechanical energy back into electrical energy and feeds it to the battery simulator 8. When simulating braking, the first permanent magnet synchronous motor 1 provides reverse torque, converting the mechanical energy back into electrical energy and feeding it to the battery simulator 8. The second permanent magnet synchronous motor 7 converts the electrical energy supplied by the battery simulator 8 back into mechanical energy. The entire test bench forms an electrical seal at the battery simulator 8 end. The battery simulator 8 only needs to compensate for the electrical and mechanical energy losses in the system, and its power consumption is relatively low, thereby reducing the cost of the test bench. In addition, the torque response of the first permanent magnet synchronous motor 1 and the second permanent magnet synchronous motor 7 is relatively fast, and their torque alternation frequency is relatively high, which can save test time and shorten the development cycle. This dual-drive test bench can also be used for transmission assemblies and other tests requiring alternating torque. This utility model has a simple structure, is easy to install, is mobile, highly portable, and widely applicable, and can meet the dynamic torsional fatigue strength test requirements for transmission shafts and reducer assemblies.

Claims

1. A dynamic torsional fatigue testing bench for transmission shafts, characterized in that: It includes a first permanent magnet synchronous motor (1), a torque meter (2), a first spline sleeve (4), a second spline sleeve (6), a second permanent magnet synchronous motor (7), a battery simulator (8), and an iron plate (13), as well as a first bracket bearing seat (9) and a second bracket bearing seat (11) that are vertically mounted on the iron plate (13) in sequence. The first permanent magnet synchronous motor (1) is mounted on the first bracket bearing seat (9); the electrical interface of the first permanent magnet synchronous motor (1) is connected to the battery simulator (8); the torque output shaft of the first permanent magnet synchronous motor (1) is connected to the first bearing on the first bracket bearing seat (9); the first bearing is also connected to the input end of the torque meter (2); The output end of the torque meter (2) is coaxially connected to the input end of the first spline sleeve (4) and is used to measure the torque during the test. The output end of the first spline sleeve (4) is coaxially connected to one end of the shaft to be tested (5); The second permanent magnet synchronous motor (7) is mounted on the second bracket bearing seat (11). The electrical interface of the second permanent magnet synchronous motor (7) is connected to the battery simulator (8). The torque output shaft of the second permanent magnet synchronous motor (7) is connected to the second bearing on the second bracket bearing seat (11). The second bearing is also coaxially connected to the input end of the second spline sleeve (6). The output end of the second spline sleeve (6) is coaxially connected to the other end of the shaft to be tested (5).

2. The dynamic torsional fatigue testing bench for transmission shafts according to claim 1, characterized in that: It also includes the transition flange (3); One end of the transition flange (3) is connected to the output end of the torque meter (2), and the other end is connected to the input end of the first spline sleeve (4).

3. The dynamic torsional fatigue testing bench for transmission shafts according to claim 2, characterized in that: It also includes a third bracket bearing seat (12) that is vertically mounted on the iron plate (13); The third support bearing seat (12) is provided with a third bearing and a connecting shaft installed on the third bearing; one end of the connecting shaft is provided with an internal spline, which is connected to the external spline of the transition flange (3); the other end is provided with an end face tooth, which is connected to the end face tooth of the input end of the first spline sleeve (4).

4. A dynamic torsional fatigue testing rig for transmission shafts according to any one of claims 1-3, characterized in that: It also includes an internal gear sleeve (10); the shaft to be tested (5) includes the main test shaft and the auxiliary test shaft; The output end of the first spline sleeve (4) is used to connect to one end of the main test shaft, and the output end of the second spline sleeve (6) is used to connect to one end of the auxiliary test shaft; The internal teeth at both ends of the internal gear sleeve (10) mesh with the external teeth at the other end of the main test shaft and the other external teeth at the other end of the auxiliary test shaft, respectively.

5. The dynamic torsional fatigue testing bench for transmission shafts according to claim 4, characterized in that: The first permanent magnet synchronous motor (1) and the second permanent magnet synchronous motor (7) have the same structure, and their maximum torque alternating frequency is 10000Nm / s.

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