Umbhobho omile okhethekileyo
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ityhubhu yentsimbi engenastainless eyi-elliptic flat ene-fan-shaped groove
Iityhubhu ezibunjiweyo zisetyenziswa ngokubanzi kwiindawo ezahlukeneyo zesakhiwo, izixhobo kunye namalungu omatshini.Xa kuthelekiswa netyhubhu ejikelezileyo, ityhubhu enobumba obukhethekileyo ngokuqhelekileyo inomzuzu omkhulu we-inertia kunye ne-modulus yecandelo, inokugoba okukhulu kunye nokuchasana kwe-torsional, inokunciphisa kakhulu ubunzima besakhiwo, gcina intsimbi.