ʻO nā bearings kekahi mea nui o nā mīkini o kēia wā. ʻO kāna hana nui, ʻo ia ke kākoʻo i ke kino rotating mechanical, hoʻemi i ka coefficient friction i ka wā o kona neʻe ʻana, a hōʻoia i ka pololei o ka rotation.

E like me nā ʻano friction like ʻole o nā mea neʻe, hiki ke hoʻokaʻawale ʻia nā bearings i ʻelua mau ʻāpana: rolling bearings a me sliding bearings.

Hoʻohana maʻamau i nā bearings ʻōwili ʻia nā bearings pōleʻa hohonu, nā bearings roller cylindrical a me nā bearings pōlele pahu. I waena o lākou, ua hoʻohālikelike ʻia nā bearings rolling, a ua haku ʻia i ʻehā mau ʻāpana: ke apo o waho, ke apo i loko, ke kino holo a me ka hale.

Piʻi kinipopo hohonulawe nui i ka ukana radial, a hiki nō hoʻi ke halihali i ka ukana radial a me ka ukana axial i ka manawa like. Ke hoʻokau wale ʻia i ka ukana radial, ʻaʻole ka huina pili. I ka loaʻa ʻana o ka radial radial nui o ka puʻu pōleʻa hohonu, loaʻa iā ia ka hana o ka angular contact bearing a hiki ke halihali i kahi ukana axial nui. He liʻiliʻi loa ka pānaʻi kuʻekuʻe o ka puʻu pōleʻa hohonu a kiʻekiʻe hoʻi ka wikiwiki palena.

ʻO nā bearings pōleʻa hohonu ka ʻoi loa o nā bearings rolling a hoʻohana nui ʻia. He kūpono ia no ka hana kiʻekiʻe a kiʻekiʻe loa, a paʻa loa me ka mālama ʻole ʻana. ʻO kēia ʻano o ka bearing he liʻiliʻi friction coefficient, kiʻekiʻe palena wikiwiki, hana maʻalahi, haʻahaʻa haʻahaʻa kumu kūʻai a maʻalahi e hoʻokō i ka hana kiʻekiʻe. ʻOkoʻa ka nui a me ke ʻano, a hoʻohana ʻia i nā mea kani pololei, nā kaʻa haʻahaʻa haʻahaʻa, nā kaʻa, nā kaʻa a me nā mīkini maʻamau a me nā ʻoihana ʻē aʻe, a ʻo ia ke ʻano o nā bearings i hoʻohana nui ʻia i ka ʻoihana mīkini. Hāʻawi nui i ka ukana radial, akā lawe pū kekahi i kahi nui o ka ukana axial.

Cylindrical roller bearings, ʻo nā mea ʻōwili he mau radial rolling bearings o cylindrical rollers. ʻO nā huila cylindrical a me nā ala heihei he mau laina pili laina. Hiki ke hoʻouka, e halihali i ka ukana radial. He liʻiliʻi ka friction ma waena o ka mea ʻōwili a me ka iwi ʻaoʻao o ke apo, kūpono ia no ka hoʻololi kiʻekiʻe. Wahi a ke apo he mau iwi ʻaoʻao a ʻaʻole paha, hiki ke hoʻokaʻawale ʻia i nā bearings lālani hoʻokahi e like me NU, NJ, NUP, N, NF, a me nā bearings laina pālua e like me NNU a me NN.

Cylindrical roller bearings me ka ʻole o nā iwi ʻaoʻao ma ke apo o loko a i waho paha, hiki i nā apo o loko a me waho ke neʻe e pili ana i ke kuhikuhi axial, no laila hiki ke hoʻohana ʻia e like me nā bearings hope manuahi. ʻO nā bearings roller cylindrical me nā iwi ʻaoʻao ʻelua ma kekahi ʻaoʻao o ke apo i loko a me ke apo o waho a me kahi iwi ʻaoʻao ma kekahi ʻaoʻao o ke apo hiki ke kū i kekahi degere o ka ukana axial i hoʻokahi ʻaoʻao. ʻO ka mea maʻamau, hoʻohana ʻia kahi hale hoʻoheheʻe kila, a i ʻole ka hoʻohana ʻana i ka hao keleawe e huli ana i ka hale paʻa. Eia nō naʻe, aia kekahi ʻāpana o ka hoʻohana ʻana i ka hale hana polyamide.

Hoʻolālā ʻia nā bearings pōleʻa pahu no ke kū ʻana i nā ukana hoʻopaʻa i ka wā o ka holo wikiwiki ʻana, a me nā ferrules e like me ka holoi ʻana me nā awāwa raceway no ka ʻōwili pōpō. No ka mea, aia ka ferrule ma ke ʻano o kahi cushion noho, ua māhele ʻia ke ʻano o ka puʻupuʻu pōleʻa i ʻelua mau ʻano: ʻano cushion noho paʻa a me ke ʻano o ka cushion noho spherical. Eia kekahi, hiki i kēia halihali ke kū i nā ukana axial, akā ʻaʻole i nā ukana radial.

Hoʻokuʻu ʻia i nā bearings kinipōpōhe ʻekolu ʻāpana: ka mea holoi noho, ka mea holoi a me ka hui hale kinipōpō kila. Ua kūlike ka mea holoi holoi me ke kumu a ua kūlike ke apo noho me ka hale. He mea kūpono wale nō nā bearings ball thrust no nā ʻāpana e amo ana i ka ukana axial ma kekahi ʻaoʻao a me ka wikiwiki haʻahaʻa, e like me nā lou crane, nā pā wai kū i luna, nā centrifuges vertical, jacks, low-speed reducers, etc. hoʻokaʻawale ʻia o ka bearing a hiki ke ʻākoakoa a hoʻokaʻawale ʻokoʻa.