A new type of mechanism for human powered and electric-assist bicycles, provided within its rear wheel hub, that transfers drive motion from the drive-train to the wheel, while allowing non ratcheting freewheeling when coasting.The mechanism uses of a pair of face gears, with the first gear fixed within the hubshell, while the second gear is rotary fixed but allowed to move axially within the freehub. The second gear is attached to prismatic sliding joints with springs, coiled over a shaft fixed to the hubshell.Rotating the freehub in the forward direction by the drive-train, rotates the second gear, sliding on the prismatic joints to axially dispose it towards the first gear until they couple and transfer drive. When the freehub rotates in the opposite direction relative to the hubshell, the second gear moves away from the first gear, transferring an unwinding motion to the coiled springs that start to slip on the rotating shaft, allowing freewheeling.
BICYCLE REAR HUB DRIVE MECHANISM
2023-04-20
Patent
Electronic Resource
English
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