High reduction ratio transmission

Transmission comprising:

• a ring gear in which one single flexible gearwheel is arranged, where said single flexible gearwheel is connected to a wave generator and said wave generator deforms said single flexible gearwheel such that it is in engagement in some regions with said ring gear, and where said flexible gearwheel includes a plurality of toothed segments which are connected to one another by way of spring segments and at least one of said toothed segments includes a recess in which a pin element is arranged;
• and
• each of spring segments has a middle plane (MFS) which contains a central middle axis of said transmission and divides said respective spring segment into two regions of equal size and each recess has a middle plane which includes said central middle axis of said transmission and divides said recess into two regions of equal size, and said middle plane of each spring segment is at a different distance from said middle plane of said recess disposed on each side of said middle plane (MFS) of said spring segment, adjacent to said middle plane of said spring segment.