Freehub

192 clutches and power-stop control – Clutches – Velocipede free wheel

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Details

192 46, 3011105, F16D 4124

Patent

active

054602548

ABSTRACT:
The present invention relates to a bicycle freehub having a hub body, an axle and a sprocket coupling. The axle is coaxially disposed in the hub body which has a spindle, two flanges and two ring ends. One of the ring ends has a receiving cavity and the other ring end has a bearing receiving recess. The receiving cavity provides a ratchet ring which has an outer rim and a plurality of ratchets provided along its inner circumference. The sprocket coupling has a cylindrical pawl driver at one end. The pawl driver further provides at least two recesses on its circumference for retaining two pawls thereon respectively and an annular groove along its outer periphery fpr receiving a coil spring to hold the two pawls in position. The sprocket coupling is connected with the hub body by inserting the pawl driver into the receiving cavity coaxially, thus the pawls are engaged with the ratchets for enabling said sprocket coupling to drive the hub body in a direction but is free to rotate in the other direction. A sprocket bearing is held between the sprocket coupling and the ratchet ring. Accordingly, the ratchets of the ratchet ring are more close to the central portion of the hub body than the conventional, so that it reduces the distance of transmitting force and eliminates the damaging shearing force and torque.

REFERENCES:
patent: 2226247 (1940-12-01), Lesage
patent: 2489934 (1949-11-01), Schwinn
patent: 4580670 (1986-04-01), Nagano
patent: 4674617 (1987-06-01), Nagano
patent: 4702486 (1987-10-01), Tsuchie

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