粘性流体による密封作用に関する研究 : 第5報 グリースを用いた実験

In the previous reports, it has been shown that the pump lift or the sealing pressure is proportional to the viscosity of the working fluid. we have carried out therefore some experiments using greases of higher viscosity than liquid oils. A summary of the results is as follows ; a) The sealing pressure for the grease is proportional to the angular velocity (w) andthe coefficient of sealing performance (S) as shown in the previous peports for oils. b) Using some greases, the sealing pressure is about from 30 to 70 times of that for oils. c) The filling state of greases in grooves of rotating shaft is considerably varied with the kind of greases, so that we must select the suitable depth of groove. d) To keep the viscosity of the sealing substance at a higher value, it is extremely important to cool the sealing apparatus.