Rotating bicycle joint assembly and a method for preventing ingress of dirt in a bearing

A method for preventing ingress of dirt in a bearing of a rotating bicycle joint assembly, said method comprises steps of:

• placing said bearing between a rotating joint part and a fixed joint part of said rotating bicycle joint assembly,
• fixating an outer part of said bearing in relation to one of said rotating joint part or said fixed joint part, and fixating an inner part of said bearing in relation to the other of said rotating joint part or said fixed joint part,
• fixating a dust cover of said rotating bicycle joint assembly in relation to said inner part of said bearing, wherein an outer cover diameter of said dust cover is bigger than an outer bearing diameter of said bearing, so that said dust cover extends radially past said outer part,
• fixating an impeller of said rotating bicycle joint assembly in relation to said rotating joint part at said outer cover diameter of said dust cover, said impeller including a plurality of flat impeller surfaces protruding outward and inclined in relation to a joint assembly plane, which extends perpendicularly in relation to a rotational axis of said rotating joint part, said plurality of flat impeller surfaces being inclined at a surface angle between 5 and 60 degrees in relation to said joint assembly plane, and a maximum radial extent of said impeller ranging from 1% to 15% of an outer impeller diameter of said impeller, and
• rotating said rotating joint part and said impeller, so that said impeller deflects dirt away from said rotating joint part.

A pulley wheel system, a crank assembly, or a wheel hub assembly of a bicycle, comprising:

• a rotating bicycle joint assembly including:
• a rotating joint part,
• a fixed joint part,
• a bearing located between said rotating joint part and said fixed joint part, an outer part of said bearing fixed in relation to one of said rotating joint part or said fixed joint part, and an inner part of said bearing being fixed in relation to the other of said rotating joint part or said fixed joint part,
• a dust cover having an outer cover diameter of said dust cover being bigger than an outer bearing diameter of said bearing, so that an outer periphery of said dust cover extends radially past said outer part, and
• an impeller arranged at said outer periphery of said dust cover and fixed in relation to said rotating joint part, said impeller including a plurality of flat impeller surfaces protruding outward and inclined in relation to a joint assembly plane, which extends perpendicularly in relation to a rotational axis of said rotating joint part, said plurality of flat impeller surfaces being inclined at a surface angle between 5 and 60 degrees in relation to said joint assembly plane, and a maximum radial extent of said impeller ranging from 1% to 15% of an outer impeller diameter of said impeller,
• wherein said dust cover is fixed in relation to said inner part of said bearing.