Influence of Temperature on Torque Transmission Stability of Magnetorheological Fluid

Aiming to obtain the influence mechanism of temperature on the torque transmission stability of magnetorheological fluid, firstly, a magnetorheological transmission device and its test-bed are established, and then, the thermal expansion, temperature pressure effect, heat volatilization, viscosity temperature characteristic, magnetic temperature characteristic and other related temperature characteristics were experimented systematically. The results indicate that the thermal expansion rate of 30 wt% magnetorheological fluid is 6 % and 18 % respectively at 120 degrees C and 220 degrees C, and the working space pressure is 13 kPa when the temperature rises from 32 degrees C to 63 degrees C. The thermal volatilization rate is still lower than 1 % at 200 degrees C for 8 hours. The viscosity of the silicone oil based magnetorheological fluid decreases by 78 % when the temperature increases from 20 degrees C to 240 degrees C, and the saturation magnetization decreased by 6.2 %, 13 % and 23 % respectively at 150 degrees C, 250 degrees C and 350 degrees C. Furthermore, the temperature field distribution experiment shows that the highest temperature region is at the outer diameter of the disk and expands slowly along the radial direction. Moreover, compared with rotational speed, temperature is the main factor affecting the torque fluctuation of magnetorheological fluid.