FREELY ROTATING ANNULAR BODY TYPE BRAKE DEVICE

摘要

A freely rotating annular body type brake device, wherein the rotational speed of a rotating portion such as the wheel of a means of communication and the rotating shaft of a machine tool relative to that of a stationary portion at their frictional sliding portions is reduced by interposing a freely rotating annular body between the rotating portion and the stationary portion to increase a braking force while reducing a heating value due to braking. A first freely rotating annular body (50) and a second annular body (60) are interposed between a ring gear (35) and a planetary carrier (32) built in a transmission, and pushed by a pushing means (70) for frictional engagement. As a result, the freely rotating annular body type brake device capable of braking the rotation of a rotating shaft (23) can be provided.