The rotary reducer is a full-cycle rotary reduction transmission mechanism integrated with a driving power source. The slewing bearing is used as a transmission follower and a mechanism attachment member, and an active member is attached to a ring in the inner and outer rings of the slewing ring. Driving the source and the casing, and using the other ring as both the transmission follower and the connecting base of the driven working part, so that the slewing bearing itself is a feature of the full-circle rotary joint, and the driving power source is efficiently configured and The main transmission part makes it a general-purpose reduction transmission mechanism that integrates the functions of rotation, deceleration and drive, while having a simple structure and convenient manufacture and maintenance.

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