抄録
Recently, new technology has been utilized to develop environment-friendly angular contact ball bearings for machine tool spindles. Bearings with a bore diameter of 100mm have been tested to confirm the operating characteristics of these newly designed parts. In addition, a specially designed lubricant nozzle was also introduced and found to reduce the noise caused by balls cutting off the air jet of air oil by 6 to 8dBA at speeds greater than 10,000rpm. The newly designed nozzle in combination with the newly designed bearings is also effective at reducing the air-oil consumption. The newly developed bearings are capable of operating with an air rate of 10NL/min and an oil rate of 0.03mL/21min at a speed of 21000rpm. This is only 40% of the air rate and 10% of the oil rate of a conventional system. The electrical energy consumption of this newly developed environment-friendly technology is expected to be 20% less than a conventional system.
