Bicycle hub

A bicycle hub, comprising an axle, a hub body, a ratchet seat, and a clutch assembly, wherein:

• an axis of the axle is defined as an axial direction;
• the hub body coaxially and rotatably fits around the axle;
• two opposite sides of the hub body in the axial direction have a first end portion and a second end portion respectively;
• an inner side of the first end portion, along a direction from the second end portion to the first end portion, sequentially has an abutting portion and an inner bevel gear that is concentrical with the axle;
• an inner peripheral surface of the inner bevel gear has a plurality of inner bevel teeth around the axle, wherein each of the plurality of inner bevel teeth is inclined relative to the axial direction;
• the ratchet seat coaxially and rotatably fits around the axle;
• the ratchet seat has a freehub body, an insertion tube, and an annular wall that is connected between the freehub body and the insertion tube;
• the insertion tube has an outer diameter less than an outer diameter of the freehub body;
• the insertion tube is inserted into the first end portion;
• and
• the clutch assembly includes an outer bevel gear and an elastic body;
• the outer bevel gear fits around the insertion tube in a manner that the outer bevel gear is slidable only in the axial direction;
• an outer peripheral surface of the outer bevel gear has a plurality of outer bevel teeth;
• the plurality of outer bevel teeth surround the axle and are adapted to mesh with the plurality of inner bevel teeth;
• each of the plurality of outer bevel teeth is inclined relative to the axial direction;
• when the outer bevel gear meshes and enters the inner bevel gear, the outer bevel gear is abutted by the abutting portion to be retained in the inner bevel gear;
• the elastic body is disposed between the outer bevel gear and the annular wall in a compressible manner and is adapted to push the outer bevel gear toward the inner bevel gear along the axial direction.