Patent ID: 8109809

Claim:
An eccentric transmission, comprising: an armature shaft ( 14 a - 14 e ) having a rotation axis; an eccentric element ( 12 a - 12 e ) including an armature recess at one end for receiving and thereby fixedly connecting the armature shaft ( 14 a - 14 e ), a cylindrical drive pin ( 38 a ) on its other end and a recess in a form of a flattened area operating as an imbalance compensation element ( 10 a - 10 e ); at least one ball bearing ( 34 a ), which is coupled to and mounted upon the cylindrical drive pin ( 38 a ) of the eccentric element ( 12 a - 12 e ); an oscillating link ( 32 a - 32 e ) having a fork-shaped first end and a second end, wherein the fork-shaped first end is in coupling contact with both sides of an outer circumference of the at least one ball bearing ( 34 a ); and a drive shaft ( 16 a - 16 e ) that is non-rotatably connected to the second end of the oscillating link, wherein a center of mass of a total system comprising the eccentric element ( 12 a - 12 e ) and the at least one ball bearing lies on the rotation axis, wherein the eccentric element ( 12 a - 12 e ) rotates with the armature shaft ( 14 a - 14 e ) and converts, due to its own rotation during an operation mode, a revolving rotary motion of the armature shaft ( 14 a - 14 e ) into an oscillating rotary motion of the drive shaft ( 16 a - 16 e ) via the oscillating link ( 31 a - 32 e ) in order to drive an insertion tool ( 40 a - 40 e ) of a hand-held power tool ( 18 a - 18 e ) to oscillate, and wherein the imbalance compensation element ( 10 a - 10 e ) is a one-piece part of an additional functional unit ( 12 a - 12 d , 14 e ).