Freely mounted wheel set made of micro-machinable material and method of fabricating the same

Abstract

The invention relates to a gear train ( 51, 51′ ) including an arbour ( 53, 53′ ) a first end of which is fitted with an integral collar ( 52, 52′ ), a first wheel set ( 55, 55′ ) made of micro-machinable material being fitted onto the second end of the arbour ( 53, 53′ ). According to the invention, the gear train ( 51, 51′ ) includes a second wheel set ( 57, 57′ ) made of micro-machinable material, which is independent of the movements of said first wheel set and which includes an aperture ( 58, 58′ ) whose wall is mounted opposite said arbour so that the second wheel set ( 57, 57′ ) is freely mounted on said first end of the arbour ( 53, 53′ ).

1 - 10 . (canceled) 
     
     
         11 . A gear train including an arbour, a first end of which is fitted with an integral collar, a first wheel set made of micro-machinable material being fitted onto the second end of the arbour, wherein the gear train includes a second wheel set made of micro-machinable material which is independent of the movements of said first wheel set and which includes an aperture, whose wall is mounted opposite said arbour so that the second wheel set is freely mounted on said first end of the arbour. 
     
     
         12 . The gear train according to  claim 11 , wherein said second end is fitted with a second collar, integral with the arbour, which partially covers said first wheel set. 
     
     
         13 . The gear train according to  claim 12 , wherein said second collar is toothed so as to form a second level of said first wheel set. 
     
     
         14 . The gear train according to  claim 11 , wherein the first wheel set includes, at least partially, an external coating. 
     
     
         15 . The gear train according to  claim 11 , wherein said arbour is made of low friction material. 
     
     
         16 . The gear train according to  claim 11 , wherein the micro-machinable materials are silicon-based. 
     
     
         17 . A timepiece, wherein it includes at least one gear train according to  claim 11 .