Effect of Cross-Sectional Profile of Circular Dimples on Hydrodynamic Lubrication Characteristics of Thrust BearingsPages 21-25
Ryota Ishii Abstract:
The effects of three types of dimples with different internal structures on
the fluid lubrication characteristics of thrust bearings were investigated.
The load-carrying capacity and the frictional torque were measured. The
measurements were performed with a fixed constant film thickness. The
behaviours of cavitation bubbles occurred within the dimple were
observed through the rotating glass plate. Three types of internal
structures of dimples were tested: cylindrical, sphere and conical. The
measurement results were simulated by the Reynolds equation. As the
results, the load-carrying capacity increased as the rotational speed
increased. The cylindrical internal structure built up the largest pressure
at the trailing edge, and consequently the largest load-carrying capacity.
The frictional torque also increased with increasing the rotational speed.
However, the effect of the internal structure on the frictional torque was
not significant. Keywords:Thrust bearings,
Hydrodynamic lubrication,
Dimples,
Load-carrying capacity,
Frictional torque
|
PDF 