Patent ID: 7297087

Claim:
A micro gear system on the principle of the strain wave gear system ( 56 ) or Wolfrom gear system ( 58 ) of flat construction, which has a planetary gear system, comprising a sun wheel ( 14 ) and at least two or more planet wheels ( 16 ) meshing with the sun wheel ( 14 ), in which the sun wheel ( 14 ) is seated in a manner fixed against relative rotation on a drive shaft ( 20 ) disposed centrally with respect to a longitudinal axis ( 18 ) of the gear system or is a component of the drive shaft ( 20 ), and the planet wheels ( 16 ) mesh indirectly or directly with a gear wheel which is connected in a manner fixed against relative rotation to a driven shaft ( 28 ), which is disposed centrally with respect to the longitudinal axis of the gear system, and the planetary gear system has a tooth module of less than 100 μm, and the planet wheels ( 16 ) are floatingly supported without a carrier and each planet wheel ( 16 ) is embodied as a ring which has spring elasticity in the radial direction, characterized in that the drive shaft ( 20 ) and driven shaft ( 28 ) are embodied as a hollow shaft ( 30 , 32 ) and jointly provide a continuous bore ( 34 , 36 ) or a continuous conduit which passes through a housing ( 48 ) of the gear system, the housing ( 48 ) of the gear system comprises two housing parts ( 52 , 54 ), which mesh with one another and form the housing in the shape of a cup, and the housing parts ( 52 , 54 ) receive the sun wheel ( 14 ) and the planet wheels ( 16 ) therebetween.