Silent hub structure

A silent hub structure, comprising:

• a hub housing, wherein a side of the hub housing has a hollow assembly slot for fixedly installing an interlocking ring, wherein an outer portion of the interlocking ring has an assembly portion installed inside the hollow assembly slot, an inner portion of the interlocking ring having a central through-hole slot, the through-hole slot including a detent ring disposed rotatably therethrough and the through-hole slot internally and circumferentially provided with a plurality of receiving grooves recessed on the internal wall;
• wherein each receiving groove includes a metal roller pin along an axial direction, a depth at a forward-rotating direction side of each receiving groove being less than a size of the roller pin to form a clamping portion so that a surface edge of each roller pin exceeds a boundary of the receiving groove to contact the detent ring for stopping relative movement;
• a respective magnetic member disposed in the interlocking ring near the clamping portion of each of the receiving grooves, a depth of a backward-rotating direction side of each receiving groove being greater than the size of the roller pin to form a releasing portion;
• wherein an outer boundary of the detent ring forms a detent ring surface and an inner boundary of the detent ring has a threaded pivot portion;
• and
• a cassette base, wherein an end of the cassette base has an outer threaded pivot stem and is coupled through the pivot stem to move with the detent ring.