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Hand-cranked winch with self-locking mechanism

2025-09-18

rizhi

Hand-cranked winch with self-locking feature: 1.  Structural components:  - Worm:** A shaft with helical teeth, connected to the crank. -  Whirlwheel:  A helical gear that meshes with the worm, either coaxial with the load drum or directly part of the drum. 2. Working principle: Worm drive has a crucial characteristic: the worm can only drive the whirlwheel, not the other way around. This is because the helix angle of the worm is very small, resulting in a friction angle greater than the helix angle, which meets the conditions for mechanical self-locking. - When you crank the handle (to drive the worm), power is smoothly transmitted from the worm to the whirlwheel, causing the drum to rotate and wind or unwind the rope. - When you stop cranking, the load attempts to drive the drum (whirlwheel) in the opposite direction through the rope. However, the force required for the whirlwheel to drive the worm in reverse far exceeds the range that static friction can overcome. The high friction and the low mechanical efficiency cause the system to “lock” in place, achieving one-way self-locking.

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