Considering the influence of the inertia item on temperature distribution of multidisk friction pairs in hydroviscous drive (HVD), transient temperature models are derived with the aim of revealing the effect of engagement pressure, lubricant viscosity, viscosity–temperature correlation, surface roughness and the ratio of inner and outer radius of disks on temperature distribution. The results indicate that unsteady temperature gradient can be avoided by matching the suitable materials for multidisk friction pairs. The average temperature for the case of neglecting the inertia item is lower than that of the case of including the inertia item. It is shown that during the soft-start, the temperature along the radial direction achieves its peak value near the outlet and keeps decreasing along the axial direction; while after the engaging process, the temperature distribution tends to be uniform. It is also shown that the decrease of engagement pressure, surface roughness and the ratio of inner and outer radius of disks can reduce temperature gradient effectively as well as the increase of lubricant viscosity. The average temperature for the case of including the viscosity–temperature correlation is much higher than that for other cases.
Considering the influence of the fluid-inertia item on dynamic transmission characteristics during soft-start of hydro-viscous drive (HVD), theoretical models were derived with the aim of revealing the effect of engagement pressure, lubricant viscosity, viscosity-temperature characteristics, surface roughness and the ratio of inner and outer radius of plates on total torque and viscous torque. The results indicate that the increase of engagement pressure and lubricant viscosity shortens soft-start time and increases peak total torque in the stage of mixed lubrication. The decrease of surface roughness and effective contact area of plates can both shorten soft-start time. And yet two cases of time to reach peak total torque are in different stages. Fluid-inertia item included can help to avoid fluctuation of the total torque while increasing lubricant viscosity or reducing surface roughness. It can increase soft-start time obviously when considering viscosity-temperature characteristics. In short, the research reveals the influence rules of the fluid-inertia item on dynamic transmission characteristics of HVD; additionally, fluid-inertia item included contributes to reduce oscillation of the total torque and the decline in efficiency. Therefore, the research results lay a theoretical foundation for the design of high-power HVD device.
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