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Metoda obliczania momentu tarcia w łożyskach tocznych kulkowych zwykłych niedociążonych

Kusznierewicz Z.

Pomiary Automatyka Kontrola

2011

R. 57, nr 9

1063-1066

W literaturze brak jest informacji dotyczących wyznaczania momentu tarcia w łożyskach tocznych kulkowych zwykłych niedociążonych stosowanych w urządzeniach pomiarowych. W artykule przedstawiono istniejące modele do obliczania orientacyjnych wartości momentu tarcia łożysk tocznych. Przedstawiono zakres ich stosowalności. Zaproponowano prostą zależność umożliwiającą obliczenie momentu tarcia w łożyskach kulkowych zwykłych niedociążonych stosowanych w urządzeniach pomiarowych. Przedstawiono stanowisko badawcze oraz wyniki badań doświadczalnych uzasadniające poprawność opracowanej zależności.

In the relevant bibliography, there is no information on how to determine the friction torque in standard ball bearings, which are applied in measuring devices as under-loaded. The paper presents the existing models for computing approximate values of the friction torque of ball bearings. Scopes of their applications are indicated. There is presented a simple dependency making it possible to calculate the friction torque of standard ball bearings applied to measuring devices as under-loaded. The dependency concerns a case of a support in two stand-ard ball bearings lubricated with few drops of oil with viscosity of 8-10 mm2/s at 50 oC, and is expressed by Eq. (13) where: Mt - friction torque in Nmm; d - diameter of the inner ring of the bearing in mm; n - rotational speed in rpm (for n>3000 rpm it should be accepted that n=3000 rpm); Pp - load of the support due to transverse force in N; C - coefficient dependent on the radial clearance in a bearing loaded due to longitudinal force Pw in N (C= 4 for a bearing with a standard clearance; C=3 for a bearing with an increased clearance; C=6 for a bearing with a reduced clearance). The proposed equation does not apply to a friction torque occurring at a start-up of the bearings. There is also presented a test station as well as the results of experimental studies that prove the proposed dependency to be correct. The measurements were taken using a method of coasting (accelerating an inert mass). The influence of the rotational speed, the load and its direction as well as the radial clearance in the bearing on the friction torque is also discussed.

The characteristics of hydrostatic journal bearing with a floating bush

Yamamoto H., Harada M., Tsukazaki J., Sato Y.

International Journal of Applied Mechanics and Engineering

2002

Vol. 7, Spec. is

127-132

We proposed a new type hydrostatic journal bearing with a floating bush to decrease the frictional torque. The characteristics of proposed bearing are calculated and we found out the optimum design parameter. Moreover, we fabricated the test bearing and measured the characteristics of bearing. The calculated results and the measured results are relatively coincide with each other.