Abstract
Hydro-viscous clutch is a speed-regulating device for heavy fans and water pumps. It has important engineering significance in the fields of soft-start for rotating machinery. More and more attention has been paid to its torque and control characteristics. This paper is focused on the torque formula for hydro-viscous clutch (HVC), assuming that multi-friction plates distribute ununiformly with different oil film thickness. A mathematical model of friction plates was constructed, then the distribution formula of the oil film thickness was obtained. A new expression was presented using a modified factor. Parameters such as pressure, viscous torque, and oil film thickness were obtained. The results show that each clearance of friction plates is not the same and the distribution of oil film thickness is influenced by pressing force, groove depth, angular ratio of groove/non-groove, and static friction force. To verify the proposed expression, relevant experiments were carried out on an HVC with multi-friction plates, and the experimental results indicate that the new expression is more accurate compared to the original one.
Highlights
Hydro-viscous drive is a new branch of fluid power transmission, in which the power is transmitted by fluid shear based on the Newton inner friction law
When it is in the stable speed regulation operation condition, it is generally considered that the oil film thickness between the friction plates is equal, which is inconsistent with the actual situation
In order to obtain a more accurate torque formula for hydro-viscous clutch (HVC), this paper has carried out research work from both theoretical and experimental aspects, and the conclusions are as follows: (1)
Summary
Hydro-viscous drive is a new branch of fluid power transmission, in which the power is transmitted by fluid shear based on the Newton inner friction law In some applications, such as speed regulation of heavy fans and pumps, hydro-viscous clutch (HVC) is used for energy-saving. The output torque of HVC can be regulated by changing the clearance between friction plates, which are the core factor that affects HVC’s performance [1,2,3]. As a result of the force interaction of every oil film, each clearance between a friction pair is between a frictionTherefore, pair is quite different. InInthis expression of of torque torquefor forhydro-viscous hydro-viscousclutch clutch is given in the thispaper, paper,aa new expression is given in the concondition that each clearance of friction plates is different.
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