| 主权项 |
1. A bidirectional hub assembly comprising:
an axle unit extending along an axis; a hub shell mounted on said axle unit, rotatable about the axis, and having a surrounding wall, a plurality of right-hand-drive installation grooves and a plurality of left-hand-drive installation grooves, said surrounding wall defining an inner space therein, said right-hand-drive and left-hand-drive installation grooves being formed in an inner surrounding surface of an end section of said surrounding wall, each of said right-hand-drive installation grooves being defined by a respective one of first groove-defining surfaces of said surrounding wall, and having an opening that communicates spatially with said inner space, each of said first groove-defining surfaces having a bottom surface portion that faces said opening of the corresponding one of said right-hand-drive installation grooves, and a first arc surface portion that is connected to one end of said bottom surface portion in the circumferential direction of said surrounding wall and that defines a first mounting groove portion of the corresponding one of said right-hand-drive installation grooves, each of said left-hand-drive installation grooves being defined by a respective one of second groove-defining surfaces of said surrounding wall, and having an opening that communicates spatially with said inner space, each of said second groove-defining surfaces having a bottom surface portion that faces said opening of the corresponding one of said left-hand-drive installation grooves, and a first arc surface portion that is connected to one end of said bottom surface portion in the circumferential direction of said surrounding wall and that defines a first mounting groove portion of the corresponding one of said left-hand-drive installation grooves; a driving unit mounted on said axle unit, rotatable about the axis, and having a ratchet ring section that extends into said end section of said surrounding wall and that has a plurality of outer teeth, each of said outer teeth having first and second side surfaces that are opposite to each other in the circumferential direction of said ratchet ring section; a plurality of right-hand-drive units each including a right-hand-drive pawl that has a mounting portion mounted pivotally in said first mounting groove portion of a respective one of said right-hand-drive installation grooves, a claw portion extending from said mounting portion into said opening of the respective one of said right-hand-drive installation grooves, and a driven portion, a right-hand-drive resilient member that is mounted in the respective one of said right-hand-drive installation grooves for biasing resiliently said claw portion of said right-hand-drive pawl toward said ratchet ring section, and a right-hand-drive switching member that is mounted movably in said hub shell, and that has an operation portion extending out of said surrounding wall, and a driving portion in contact with said driven portion of said right-hand-drive pawl, said right-hand-drive pawl of each of said right-hand-drive units being operable to switch between an enabled state where said right-hand-drive resilient member urges said right-hand-drive pawl to bias resiliently said claw portion to contact said ratchet ring section such that said claw portion is engageable with said first side surface of one of said outer teeth, and a disabled state where said right-hand-drive switching member pushes said driven portion of said right-hand-drive pawl to separate said claw portion from any one of said first side surfaces of said outer teeth of said ratchet ring section against the biasing action of said right-hand-drive resilient member; and a plurality of left-hand-drive units each including a left-hand-drive pawl that has a mounting portion mounted pivotally in said first mounting groove portion of a respective one of said left-hand-drive installation grooves, a claw portion extending from said mounting portion into said opening of the respective one of said left-hand-drive installation grooves, and a driven portion, a left-hand-drive resilient member that is mounted in the respective one of said left-hand-drive installation grooves for biasing resiliently said claw portion of said left-hand-drive pawl toward said ratchet ring section, and a left-hand-drive switching member that is mounted movably in said hub shell, and that has an operation portion extending out of said surrounding wall, and a driving portion in contact with said driven portion of said left-hand-drive pawl, said left-hand-drive pawl of each of said left-hand-drive units being operable to switch between an enabled state where said left-hand-drive resilient member urges said left-hand-drive pawl to bias resiliently said claw portion to contact said ratchet ring section such that said claw portion is engageable with said second side surface of one of said outer teeth, and a disabled state where said left-hand-drive switching member pushes said driven portion of said left-hand-drive pawl to separate said claw portion from any one of said second side surfaces of said outer teeth of said ratchet ring section against the biasing action of said left-hand-drive resilient member; wherein, when said right-hand-drive pawl of at least one of said right-hand-drive units is in the enabled state and said left-hand-drive pawl of each of said left-hand-drive units is in the disabled state, said bidirectional hub assembly serves as a right-hand-drive hub; and wherein, when said right-hand-drive pawl of each of said right-hand-drive units is in the disabled state and said left-hand-drive pawl of at least one of said left-hand-drive units is in the enabled state, said bidirectional hub assembly serves as a left-hand-drive hub. |
