One-way brake

The utility model provides a one-way brake which is used for being sleeved on a driving shaft and comprises an inner rotating piece and an outer rotating piece which are sleeved inside and outside, and a matching surface between the inner rotating piece and the outer rotating piece is provided with a screw pair extending along the circumferential direction. The driving shaft is sleeved with the inner rotating piece through a one-way bearing, the two axial ends of the outer rotating piece are supported on the inner rotating piece through supporting bearings, and the screw pair is arranged in the middle of the two supporting bearings. The outer rotating piece is supported by the bearings at the two ends, so that the one-way brake is uniform in stress, good in centering performance and good in stability. 本实用新型提供了一种单向制动器，用于套设在驱动轴上，其包括内外套合的内旋转件和外旋转件，所述内旋转件和外旋转件之间的配合面设有沿周向延伸的螺旋副；所述内旋转件通过一单向轴承套设在所述驱动轴上，所述外旋转件的轴向两端均通过一支撑轴承支撑于所述内旋转件上，所述螺旋副设置于两个所述支撑轴承的中部。本实用新型的外旋转件采用两端轴承支撑，使得单向制动器受力均匀、定心性能好、稳定性好。