One-way brake reliable in return

The utility model provides the one-way brake which is reliable in return, and the reliable return of the outer rotating cylinder of the one-way brake can be ensured. According to the one-way brake reliable in return, a return stroke screw pair is further designed between the outer rotating cylinder and the inner rotating cylinder besides a traditional process screw pair. In this way, when the outer rotating cylinder returns, the outer rotating cylinder can reliably return to the initial position through the return stroke screw pair, and compared with the situation that return is conducted through spring force of a return spring in the prior art, the situation that return of the outer rotating cylinder fails is avoided. 本实用新型提供了一种回位可靠的单向制动器，能够保证单向制动器的外旋转筒的可靠回位。本实用新型所提供的回位可靠的单向制动器在外旋转筒与内旋转筒之间除了设计传统的进程螺旋副以外，还设计了回程螺旋副。这样外旋转筒在回位时，通过回程螺旋副能够促使外旋转筒可靠的回到初始位置，相比于现有技术通过回位弹簧的弹簧力进行回位的情况，不会出现外旋转筒回位失效的情形。