Temperature rise test experiment of helical gear contact characteristics

MCL ⁃ 1A helical gear wear testing machine is used for the experiment, which is driven by the spindle motor, and the rotational speed is applied to the experimental helical gear through the joint action of the driving gearbox, elastic shaft and test gearbox; Set the target value of experimental torque on the console, which is added by the loading clutch. The torque value is displayed in the console through the (dynamic) torque sensor. When the target value is reached, the loading can be stopped; Then, set the speed and running time in the main control console, and click send to start the test. Figure 1 (a) is the schematic diagram of MCL ⁃ 1a, and figure 1 (b) is the on-site physical diagram of MCL ⁃ 1a.

In the process of helical gear meshing, the temperature caused by contact tooth surface friction will affect the distribution of contact load; In this test, the temperature is transmitted to the multi temperature inspection instrument through the thermocouple temperature sensor for real-time monitoring. The test site diagram is shown in Figure 1 (c). In order to simulate the quasi-static working condition, the helical gear speed is set to 33r / min, and the temperature in the measurement area under different working conditions is taken; In order to reduce the experimental error, first let the test-bed run at a given speed for a period of time to achieve heat balance, and then start the experiment and measurement.

Fig. 2 shows the temperature rise distribution curves of simulation and experiment under different torques. The simulation and experiment results of tooth root and tooth top contact area are taken as the average value of temperature; Due to the different heat dissipation effects at different positions and the inconsistent distribution of lubricating oil on the tooth surface during helical gear meshing, the cooling effect is uneven, so the temperature distribution at the top and root of helical gear is different; In the experiment, the measurement area of the tooth top is near the tooth top circle, so the lubrication effect is relatively poor, while the measurement area of the helical gear tooth root is close to the tooth root circle, the contact area is small, and the heat dissipation effect is good, so its temperature will be less than that at the tooth top of the helical gear. Because the temperature field simulation is an ideal environment, the experimental results are lower than the simulation results due to the difference of ambient temperature and the heat dissipation of helical gear; And the temperature increases with the increase of load, but the temperature change trend of experiment and simulation is basically the same, and its relative error is also within the acceptable range, which shows the correctness of the simulation model.

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