Abstract
In order to study the influence of double arc oil groove parameters on oil film torque in hydro-viscous drive, the numerical simulation and parameterized analyzing platform were built. The flow field characteristics were carried out using CFX. The parameter analysis platform was integrated with parameterized design of grooves, numerical simulation, and design of experiment (DOE). The effects of groove parameters on output torque were analyzed. The results indicate that the output torque consists of shear torque and impact torque, and the oil film shear torque plays a more important role in total torque. The shear torque is mainly affected by coefficient of effective area and velocity distribution. The velocity distribution and dynamic pressure on sidewalls are the main influencing factors on impact torque. The effect of eccentricity and oil grooves depth on the output torque is positive, but others are negative. In addition, the eccentricity and inner diameter of eccentric circle are sensitive parameters. The effects of oil groove parameters on oil film torque are analyzed accurately using the parameterized analyzing platform that is integrated with CAD, CFX, and DOE. A new method and theoretical foundation are provided for design of complex oil grooves in hydro-viscous drive.
Highlights
The hydro-viscous drive (HVD) is a kind of torque transmission device making use of oil film shearing and friction
When the friction plate (FP) keeps stationary and the separator disk (SD) rotates at the rotational speed n1, the speed stream lines between the FP and SD are shown as Figures 2 and 3
The circumferential velocity is more than the radial velocity, the shear torque generated by oil film on non-grooved area accounts for a large proportion in output torque of HVD
Summary
The hydro-viscous drive (HVD) is a kind of torque transmission device making use of oil film shearing and friction. The structure and geometrical parameters of oil grooves have a great influence on flow field characteristics and output torque of oil film. The effects of double arc oil groove parameters on shear torque, impact torque, and output torque of oil film in HVD were analyzed accurately. The structure of the double arc grooves is very complex, so it is difficult to solve the analytical solution of flow field and torque characteristics. In order to speed up the calculation, the 1/n singlecycle model of fluid flow field was established by considering the symmetrical structure of friction pairs, so the periodic boundary condition was used. In order to obtain the small vortex and boundary layer phenomena in the flow field and get more accurate calculation results, the shear stress transport (SST) turbulence model was selected for analysis.
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