Flexible gear with U-shaped groove

The invention discloses a flexible gear with a U-shaped groove, and belongs to the technical field of speed reducer transmission. The flexible gear with the U-shaped groove comprises a connecting part and a cylinder part which are coaxially arranged, wherein outer teeth are uniformly distributed on the outer wall of the end, away from the connecting part, of the cylinder part in the circumferential direction; the other end of the cylinder part is integrally provided with a bottom wall facing inwards in the radial direction, the bottom wall and the connecting part are integrally formed, and the groove is formed in the outer wall between the connecting part and the bottom wall in the circumferential direction. The service life of the flexible gear can be prolonged. 本发明公开了一种带有U形沟槽的柔轮，属于减速机传动技术领域。一种带有U形沟槽的柔轮，包括同轴设置的连接部和筒部，筒部远离连接部的一端外壁周向均匀分布有外齿；筒部的另一端一体设置有径向朝内的底壁，底壁与连接部一体成型，连接部与底壁之间的外壁周向设置有沟槽。本发明可提高柔轮的使用寿命。