Method of supplying a lubricant to a rolling bearing of a high-speed spindle

Abstract

A method of supplying a lubricant to a roller bearing of a high-speed spindle includes pressuring the lubricant in a pump chamber and discharging the pressurized lubricant within the pump chamber from the nozzle. Also, the method includes bringing a fine quantity of lubricant discharged from the nozzle into direct contact with a lubricating surface of a rotary body of the roller bearing.

1 . A method of supplying a lubricant to a rolling bearing of a high-speed spindle, the method comprising the steps of: 
 pressuring the lubricant in a pump chamber;    discharging the pressurized lubricant within the pump chamber from the nozzle; and    bringing a fine quantity of lubricant discharged from the nozzle into direct contact with a lubricating surface of a rotary body of the rolling bearing.    
   
   
       2 . The method of supplying a lubricant according to  claim 1 , further comprising: 
 supplying the lubricant from a lubricant tank to the pump chamber via a first flow passage;    supplying the lubricant from the pump chamber to the nozzle via a second flow passage; and    discharging the lubricant from the nozzle in a discharge quantity of 0.0005 cc/shot-0.01 cc/shot at a speed of 10 m/sec-100 m/sec.    
   
   
       3 . The method of supplying a lubricant according to  claim 1 , further comprising: 
 supplying the lubricant from a lubricant tank to the pump chamber via a first flow passage;    supplying the lubricant from the pump chamber to the nozzle via a second flow passage; and    discharging the lubricant from the nozzle in a discharge quantity of 0.001 ml/shot as the minimum discharge quantity per operation.    
   
   
       4 . The method of supplying a lubricant according to  claim 2 , wherein a flow passage sectional area of the first flow passage is larger than a sectional area of a discharge opening of the nozzle.  
   
   
       5 . The method of supplying a lubricant according to  claim 3 , wherein a flow passage sectional area of the first flow passage is larger than a sectional area of a discharge opening of the nozzle.  
   
   
       6 . The method of supplying a lubricant according to  claim 1 , wherein the nozzle discharges the lubricant in a pin-spot manner so that the lubricant is brought into direct contact with the lubricating surface of the rotary body of the rolling bearing without force of air.  
   
   
       7 . The method of supplying a lubricant according to  claim 1 , further comprising: 
 sucking the lubricant into the pump chamber via a cylinder, wherein the cylinder has a piston slidably disposed in an interior portion thereof and has the pump chamber disposed in the interior portion thereof, the cylinder having a suction port for sucking the lubricant into the pump chamber, the cylinder being connected to the nozzle via a pipe,    compressing the lubricant within the pump chamber with the piston to increase the pressure within the cylinder, and thereby discharging the lubricant externally from the nozzle.    
   
   
       8 . The method of supplying a lubricant according to  claim 7 , further comprising a check valve interposed between the pump chamber and the pipe.  
   
   
       9 . The method of supplying a lubricant according to  claim 1 , further comprising: 
 detecting a rotation speed of rotary body of a roller bearing using a rotation speed detector; and    adjusting a discharge quantity of the lubricant in accordance with the detected rotation speed.    
   
   
       10 . The method of supplying a lubricant according to  claim 1 , wherein the nozzle discharges the fine quantity of lubricant, as the lubricant, intermittently when the fine quantity of lubricant is compressed and its pressure increases.  
   
   
       11 . A method of supplying a lubricant to a rolling bearing of a high-speed spindle, the method comprising the steps of: 
 pressuring the lubricant in a pump chamber, the pump chamber being filled with the lubricant;    discharging the pressurized lubricant within the pump chamber from the nozzle; and    bringing a fine quantity of lubricant discharged from the nozzle into direct contact with a lubricating surface of a rotary body of the rolling bearing.    
   
   
       12 . The method of supplying a lubricant according to  claim 11 , wherein the nozzle discharges the fine quantity of lubricant, as the lubricant, by its own pressure intermittently.  
   
   
       13 . The method of supplying a lubricant according to  claim 11 , wherein the nozzle discharges the fine quantity of lubricant, as the lubricant, intermittently when the fine quantity of lubricant is compressed and its pressure increases.