Torsional fatigue testing device for shafts

Abstract

This utility model relates to the technical field of torsional fatigue testing devices, specifically a shaft-type torsional fatigue testing device, including a first support and a second support. The first and second supports are rotatably connected to a first rotating shaft and a second rotating shaft arranged coaxially. A flange is fixedly connected to one end of the first and second rotating shafts that are close to each other. A rocker arm is fixedly connected to the first rotating shaft. The middle of a balance arm is fixedly connected to the second rotating shaft. Measuring arms are hinged to both ends of the balance arm, and a fixed seat is hinged to the end of the measuring arm away from the balance arm. A load sensor is fixedly connected to the middle of the measuring arm. This utility model uses a balance arm, a rocker arm, and a load sensor to measure torque instead of a torque sensor. When the torque is large, the length of the balance arm is increased to increase the length of the lever arm, reducing the force measured by the load sensor, so that the force value is within the range of the load sensor, thus completing the torsional test.

Description

Technical Field

[0001] This utility model relates to the technical field of torsional fatigue testing devices, specifically a torsional fatigue testing device for shafts. Background Technology

[0002] Automotive drive shafts, half-shafts, and other products require torsional fatigue testing. Patent application number 201822242477.7 discloses a torsion testing bench, relating to the field of testing equipment technology. It includes a base plate, an input mechanism fixedly mounted above the base plate, and an output mechanism slidably mounted above the base plate. The input mechanism includes a bearing housing, a rotating shaft, an input flange, and a loading arm. The rotating shaft is configured within the bearing housing via two first bearings. One end of the rotating shaft is fixedly connected to the loading arm via a first expansion sleeve, and the other end is fixedly connected to the input flange. The output mechanism includes an output flange, a flange shaft, and a torque sensor. The output flange is positioned opposite the input flange. One end of the flange shaft is fixedly connected to the output flange via a second expansion sleeve, and the other end is fixedly connected to the torque sensor.

[0003] The disadvantages of the torsion test bench of the patent with application number 201822242477.7 are: 1. The measurement range of the torque sensor is limited, and torsion tests with large torsional forces cannot be carried out, and the applicable range of the test bench is narrow; 2. The torque sensor is expensive, and disassembly, maintenance and calibration are relatively complicated. Utility Model Content

[0004] The main purpose of this utility model is to provide a shaft-type torsional fatigue testing device to solve the problems in the prior art where torsional tests with large torsional forces cannot be performed, the test bench has a narrow range of applications, and the torque sensor is expensive, and disassembly, maintenance and calibration are relatively complicated.

[0005] To achieve the above objectives, this utility model provides a shaft-type torsional fatigue testing device, including a first support and a second support, with a first rotating shaft and a second rotating shaft rotatably connected to the first support and the second support respectively; a flange is fixedly connected to one end of the first rotating shaft and the second rotating shaft that are close to each other; a rocker arm is fixedly connected to the first rotating shaft; the middle part of a balance arm is fixedly connected to the second rotating shaft, and measuring arms are hinged to both ends of the balance arm respectively, with a fixed seat hinged to the end of the measuring arm away from the balance arm; a load sensor is fixedly connected to the middle part of the measuring arm.

[0006] Furthermore, a linear actuator is fixedly connected to the end of the rocker arm away from the first rotating shaft.

[0007] Furthermore, a square block 1 is provided in the middle of both the first and second rotating shafts, and a square block 2 is provided at the end of both shafts for connection with the flange; a square hole 1 that mates with the square block 1 is provided on the rocker arm and the balance arm.

[0008] Furthermore, both the first and second supports include two base plates, which are connected to a base plate by T-bolts; the base plates are provided with T-shaped slots for installing the T-bolts.

[0009] Furthermore, the seat plate is connected to the first and second rotating shafts via bearings.

[0010] This invention replaces the torque sensor with a balance arm, rocker arm, and load sensor to measure torque. The torque value is obtained by multiplying the force measured by the load sensor by the length of the lever arm. When the torque is large, the length of the lever arm is increased by increasing the length of the balance arm, thereby reducing the force measured by the load sensor and keeping the force value within the range of the load sensor to complete the torsion experiment.

[0011] This utility model, by setting a square block and a square hole, facilitates the disassembly and replacement of the balance arm.

[0012] This invention uses a load sensor instead of a torque sensor. Load sensors are cheaper and easier to disassemble, maintain, and calibrate. Attached Figure Description

[0013] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0014] Figure 1 This is a schematic diagram of the structure of the shaft-type torsional fatigue testing device in the embodiment;

[0015] Figure 2 This is a schematic diagram of the structure of the first rotating shaft in the embodiment;

[0016] Figure 3 This is a schematic diagram of the rocker arm structure in the embodiment;

[0017] Figure 4 This is a schematic diagram of the counterweight arm in the embodiment;

[0018] Figure 5 This is a schematic diagram of the flange structure in the embodiment;

[0019] In the diagram: 1. First support; 2. Second support; 3. First shaft; 4. Second shaft; 5. Flange; 6. Rocker arm; 7. Balance arm; 8. Measuring arm; 9. Fixed seat; 10. Load sensor; 11. Linear actuator; 12. Square block one; 13. Square block two; 14. Square hole one; 15. Seat plate; 16. Base plate; 17. T-bolt; 18. T-slot; 19. Bearing. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] like Figures 1 to 5 As shown in the embodiment of this utility model, a shaft-type torsional fatigue testing device is provided, including a first support 1 and a second support 2. The first support 1 and the second support 2 are respectively rotatably connected to a first rotating shaft 3 and a second rotating shaft 4 arranged coaxially. A flange 5 is fixedly connected to one end of the first rotating shaft 3 and the second rotating shaft 4 that are close to each other. A rocker arm 6 is fixedly connected to the first rotating shaft 3. The middle part of a balance arm 7 is fixedly connected to the second rotating shaft 4. Measuring arms 8 are respectively hinged to both ends of the balance arm 7. A fixed seat 9 is hinged to the end of the measuring arm 8 that is away from the balance arm 7. A load sensor 10 is fixedly connected to the middle part of the measuring arm 8.

[0022] A linear actuator 11 is fixedly connected to the end of the rocker arm 6 away from the first rotating shaft 3.

[0023] The first rotating shaft 3 and the second rotating shaft 4 are each provided with a square block 12 in the middle and a square block 23 at the end for connecting with the flange 5; the rocker arm 6 and the balance arm 7 are provided with square holes 14 that cooperate with the square block 12.

[0024] The first support 1 and the second support 2 both include two seat plates 15, and the two seat plates 15 are connected to a base plate 16 by T-bolts 17; the seat plates 15 are provided with T-shaped slots 18 for installing T-bolts 17.

[0025] The seat plate 15 is connected to the first rotating shaft 3 and the second rotating shaft 4 via bearing 19.

[0026] When using the shaft or rod torsional fatigue testing device, the two ends of the shaft or rod are fixedly connected to flanges, and then the flanges 5 on the first rotating shaft 3 and the second rotating shaft 4 are connected to fix the shaft or rod. The linear actuator 11 drives the shaft or rod to rotate through the rocker arm 6, and the torque is measured and calculated by the load sensor 10. The force measured by the load sensor multiplied by the length of the lever arm is the value of the torque.

[0027] This embodiment uses a balance arm, a rocker arm, and a load sensor to measure torque instead of a torque sensor. The force measured by the load sensor multiplied by the length of the lever arm is the torque value. When the torque is large, the length of the lever arm is increased by increasing the length of the balance arm, thereby reducing the force measured by the load sensor and keeping the force value within the range of the load sensor to complete the torsion experiment. This embodiment expands the torque measurement range.

[0028] This embodiment facilitates the disassembly and replacement of the balance arm by setting a square block and a square hole.

[0029] In this embodiment, a load sensor is used instead of a torque sensor, and the load sensor used to complete the same experiment is cheaper.

[0030] Torsion sensors require precision couplings or flange connections for each installation, making disassembly and maintenance complex. In this embodiment, the load sensor is fixed to the measuring arm with bolts, making disassembly and maintenance simpler, and calibration is also straightforward.

[0031] Torsion sensor calibration requires a dedicated torque calibration table, which is complex; the load sensor in this embodiment is directly calibrated using standard weights or a force measuring instrument, which is simple to operate.

[0032] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A shaft-type torsional fatigue testing device, comprising a first support (1) and a second support (2), wherein the first support (1) and the second support (2) are respectively rotatably connected to a first rotating shaft (3) and a second rotating shaft (4) arranged coaxially; a flange (5) is fixedly connected to one end of the first rotating shaft (3) and the second rotating shaft (4) that are close to each other; a rocker arm (6) is fixedly connected to the first rotating shaft (3); characterized in that, The second rotating shaft (4) is fixedly connected to the middle part of the balance arm (7), and the two ends of the balance arm (7) are respectively hinged to the measuring arm (8). The end of the measuring arm (8) away from the balance arm (7) is hinged to the fixed seat (9); the middle part of the measuring arm (8) is fixedly connected to the load sensor (10).

2. The shaft-type torsional fatigue testing device as described in claim 1, characterized in that, A linear actuator (11) is fixedly connected to one end of the rocker arm (6) away from the first rotating shaft (3).

3. The shaft-type torsional fatigue testing device as described in claim 1, characterized in that, The first rotating shaft (3) and the second rotating shaft (4) are provided with a square block one (12) in the middle and a square block two (13) for connecting with the flange (5) at the end; the rocker arm (6) and the balance arm (7) are provided with a square hole one (14) that cooperates with the square block one (12).

4. The shaft-type torsional fatigue testing device as described in claim 1, characterized in that, The first support (1) and the second support (2) each include two seat plates (15), and the two seat plates (15) are connected to a base plate (16) by T-bolts (17); the seat plates (15) are provided with T-shaped slots (18) for installing T-bolts (17).

5. The shaft-type torsional fatigue testing device as described in claim 4, characterized in that, The seat plate (15) is connected to the first rotating shaft (3) and the second rotating shaft (4) via bearings (19).

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