Abstract
Hydrodynamic thrust air bearings have a lot of advantages such as low environmental load, low frictional loss and maintenance-free. Therefore, hydrodynamic thrust air bearings are extremely effective against saving of energy gain recognition in machine industry. On the other hand, the bearing stiffness of hydrodynamic thrust air bearings is considerably low compared to the stiffness of oil bearings. Therefore, optimization of groove geometry proposed by Hashimoto was carried out to maximize bearing stiffness based on conventional spiral grooved bearings. As a result, an optimized bearing which has new original groove geometry was found out. The optimized bearings have been proven through experiments to have a much higher bearing stiffness compared to conventional spiral grooved bearings. However, the mechanism of enhancement of bearing stiffness is still not obvious. Consequently, this paper describes the consideration about mechanism of high-stiffness through the measurement of pressure distribution and load carrying capacity. As a result, occurrence of negative pressure was confirmed where the optimized bearings periphery. Furthermore, it is found that the optimized bearing stiffness was advanced because the load carrying capacity of optimized bearing increase exponentially at the near of floating point.
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