Cim viac zaberas, tym viac tlaci - to sice plati, ale len vtedy, ked sa uz obe casti ratchetu vzajomne dotykaju. Vzajomny dotyk zabezpecuje pruzina, ktora ma identicku ulohu ako pri DT a pri volnobehu sa teda ratchety dotykaju.
Ak by to bolo bez pruziny (alebo by bola velmi kratka) a ratchety by vobec neboli v kontakte, tak by si mal volnobezku na obe strany - lebo by nemalo co tlacit zltu naspat do zelenej, ked by sa pri volnobehu oddelili. Pozri obrazok.
Samotny hluk ovplyvnuje urcite vela faktorov: pruzina, profil a pocet zubov, vzajomny uhol ploch ratchetu.
Shimano zjavne nieco zle nadizajnovalo (v prospech nizkej hlucnosti), ked teraz maju problem.
Ta bezkontaktnost bola len marketing a technicky asi nezmysel. Pisu o tom aj tu:
https://cyclingtips.com/2018/05/shimano-xtr-m9100-m9120-release-news-details-weights/
I got to play with an early prototype of the hub, and while there is some friction briefly felt as the system begins to freewheel (likely not present in the production units), the hub then spins incredibly smoothly and quietly afterward (under 30 decibels). With Scylence’s whisper-quiet operation, Shimano now join Onyx in the silent hub game, in stark contrast to the very loud driver designs from Chris King, Industry Nine, and others. The quietness may take some getting used to.
Tusim si najdem cas cely ten ich patent precitat. Ale obrazkami je to v principe to iste ako CHK pred 20rokmi.
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