Numerical Calculation of Flow Characteristics of Oil Film between Friction Pair of Hydro-viscous Clutch
2021
The oil flow field characteristics has an important influence on the torque transmission of hydro-viscous clutch, so it isan objective of current research. In this paper, the oil film between friction pairs isstudied and its mathematical model of flow field characteristics is established based on the cavitation Reynolds boundary condition, and the solution is solved by distributed analysis method. The result shows that when it is in high-speed range, the radial velocity of the fluid in the friction gap is determined by the centrifugal term, the radial velocity raises with the increase of the revolution speed and the flow supply, and the minimum flow rate required in the friction gap depends on the centrifugal flow rate. As the radial overflow sectionincrease, the required theoretical flow increases, and the oil supply is insufficient in the direction of the outer diameter. The oil film shrinks in the inner diameter direction, leadingtothe decrease of the oil film coverage on the friction surface and the viscous shear torque.The research can help to optimize the parameters of friction disc of hydro viscous clutchand further improve the efficiency of torque transmission.
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