Patent ID: 8336694
Filing Date: 2012-12-25
Classification: F16D

Abstract:
1. A hub assembly for a bicycle, comprising: a shaft; a hub rotatably mounted on the shaft and having an inner wall provided with a plurality of locking grooves; a driven ring mounted in the hub to rotate the hub relative to the shaft and having an inner wall provided with a plurality of oneway ratchet teeth; a drive seat rotatably mounted on the shaft; a drive ring mounted on a first end of the drive seat to rotate in concert with the drive seat and received in the driven ring; a plurality of pawl members pivotally mounted on the drive ring and releasably meshing with the oneway ratchet teeth of the driven ring so that the driven ring is driven by the drive ring; at least one sprocket secured on a second end of the drive seat to rotate the drive seat and the drive ring relative to the driven ring; a control ring slidably mounted on the drive seat to rotate in concert with the drive seat and having a side provided with a plurality of locking blocks which are insertable into and releasably locked in the locking grooves of the hub respectively so that the control ring is detachably combined with the hub to rotate the hub relative to the shaft; wherein the hub has a side provided with a receiving space connected to the locking grooves and the driven ring; the drive seat and the drive ring are received in the receiving space of the hub; the drive seat has a peripheral wall provided with a plurality of axially extending slideways; the control ring is received in the receiving space of the hub; the control ring has an inner wall provided with a plurality of radially and inwardly extending sliding blocks slidable in the slideways of the drive seat respectively.