ʻO ka bearing nā apo i loko a me waho, nā mea ʻōwili (nā pōpō, nā wili a i ʻole nā ​​​​nela) a me nā mea paʻa.Ma waho aʻe o ka mea hoʻopaʻa, ʻo ke koena ke kau ʻana i ke kila.Ke hana nei ka bearing, e hoʻokau ʻia ka bearing, ke apo o waho a me ke kino o ka bearing i ke alapine kiʻekiʻe a me ke koʻikoʻi loli.ʻO nā kūlana hana o nā bearings he paʻakikī loa.Hoʻopili ka ukana ma kahi wahi liʻiliʻi o ke kino ʻōwili.ʻO ka manaʻo, no ka pōleʻa, hana ia ma kahi kikoʻī;no ka wili, hana ia ma kahi laina, a ʻo ka wahi pili ma waena o ka mea ʻōwili a me ka ferrule he liʻiliʻi hoʻi (point / line contact), no laila ke hana nei nā ʻāpana ʻāpana, ʻo ka ʻili o ka mea ʻōwili a me ka Hoʻokomo ʻia ka ferrule i kahi kaomi nui, maʻamau a hiki i 1500-5000 N/mm2;i ka wā e hoʻohuli ai ka bearing, pono ia e kū i ka ikaika centrifugal, a piʻi ka ikaika me ka piʻi ʻana o ka wikiwiki rotational;nā mea ʻōwili a me ka lima ʻAʻole ʻo ka ʻōwili wale ʻana akā ke hoʻoheheʻe ʻia ma waena o nā apo, no laila aia ka friction ma waena o nā mea ʻōwili a me ka ferrule.Ma lalo o ka hana hui ʻana o nā mana i luna aʻe, ua hana mua ʻia ka māwae luhi ma ka ʻili o ka ferrule a i ʻole ke kino ʻōwili me ka ikaika haʻahaʻa haʻahaʻa, a ma hope ua hoʻokumu ʻia ka peeling luhi, no laila e haki ka hopena i ka hopena.ʻO ke ʻano pōʻino maʻamau o ka bearing ʻo ia ka hoʻopili ʻana i ka luhi luhi, a he mea maʻamau ka deformation plastic, indentation, ʻaʻahu, māwae, etc.

ʻO ke ola a me ka hilinaʻi e pili ana i ka hoʻolālā bearing, ka hanaʻana, nā kūlana lubrication, ka hoʻokomoʻana, ka mālamaʻana a me nā mea'ē aʻe, akā,ʻo ke kūlana kiʻekiʻe a me ka hilinaʻi o nā mea halihali ke kī.Ke hana nei nā ʻāpana ʻōwili ʻōwili ma lalo o nā kūlana kiʻekiʻe a me nā kūlana lōʻihi ma lalo o nā kūlana koʻikoʻi paʻakikī e like me ka tensile, compressive, bending, shearing, alternating, and high stress values.No laila, ʻo nā koi no ka rolling bearings:

1) kū'ē kiʻekiʻe i ka plastic deformation,

2) kiʻekiʻe anti-friction a hoʻohana waiwai,

3) Kiʻekiʻe rotation pololei a me ka dimensional pololei,

4) kūlana kūpaʻa maikaʻi,

5) Ke ola lawelawe lōʻihi a me ka hilinaʻi kiʻekiʻe.

No nā bearings e hana ana ma lalo o nā kūlana kūikawā, aia nā koi kūikawā e like me ke kūpaʻa wela kiʻekiʻe, ke kūpaʻa haʻahaʻa haʻahaʻa, ke kūpaʻa corrosion a me ka diamagnetic resistance, etc.