Analysis otsika kutentha ndi mkulu kutentha chilengedwe cha mayendedwe mafuta mafuta

Kupaka mafuta nthawi zambiri kumakhala koyenera pakugwiritsa ntchito liwiro lotsika mpaka lapakati pomwe kutentha kwa ntchito kumakhala kocheperako kutentha kwamafuta. Palibe mafuta oletsa mikangano omwe ali oyenera ntchito zonse. Mafuta aliwonse amakhala ndi magwiridwe antchito ochepa komanso mawonekedwe ake. Mafuta amakhala ndi mafuta oyambira, thickener ndi zowonjezera. Mafuta okhala ndi mafuta nthawi zambiri amakhala ndi mafuta amafuta okhathamira ndi sopo wina wachitsulo. M'zaka zaposachedwa, organic and inorganic thickeners awonjezedwa ku mafuta opangira maziko. Table 26 ikufotokoza mwachidule kapangidwe ka mafuta. Table 26. Zosakaniza za Grease Base Oil Thickener Additive Grease Mineral Oil Synthetic Hydrocarbon Ester Substance Perfluorinated Mafuta Silicone Lithium, Aluminiyamu, Barium, Calcium ndi Compound Sopo Osanunkhira (zolengedwa) particles Glue (dongo), carbon wakuda, silika gelisi wopanda sopo, PTFE (organic) polyurea compound rust inhibitor dye tackifier metal passivator antioxidant anti-wear pressure additive additive calcium-based and aluminium-based greases ali ndi madzi osasunthika kwambiri, Oyenera ku mafakitale omwe amafunika kuteteza chinyezi. Mafuta opangidwa ndi Lithium ali ndi ntchito zambiri ndipo ndi oyenera kugwiritsidwa ntchito m'mafakitale ndi ma wheel-end bearings.
Mafuta opangira ma synthetic, monga esters, organic esters ndi silicones, akagwiritsidwa ntchito ndi zokhuthala ndi zowonjezera zomwe zimagwiritsidwa ntchito nthawi zambiri, kutentha kwambiri komwe kumagwiritsidwa ntchito nthawi zambiri kumakhala kokwera kuposa kutentha kwamafuta opangira mafuta. Kutentha kwamafuta opangira mafuta kumatha kuchoka pa -73 ° C mpaka 288 ° C. Zotsatirazi ndi mawonekedwe amafuta okhuthala omwe amagwiritsidwa ntchito kwambiri ndi mafuta opangidwa ndi petroleum. Table 27. Makhalidwe amtundu wa thickeners omwe amagwiritsidwa ntchito ndi mafuta opangidwa ndi petroleum Thickeners Typical Drop Point Maximum Temperature Kugonjetsedwa kwa Madzi Pogwiritsa ntchito zowonjezera mu Table 27 ndi kupanga hydrocarbon kapena ester-based mafuta, kutentha kwakukulu kogwira ntchito kungapezeke Kuwonjezeka ndi pafupifupi 10 ° C.
°C °F °C °F
Lithiamu 193 380 121 250 zabwino
Lithium complex 260+ 500+ 149 300 yabwino
Aluminiyamu yophatikizika yoyambira 249 480 149 300 yabwino kwambiri
Calcium sulfonate 299 570 177 350 zabwino kwambiri
Polyurea 260 500 149 300 Zabwino
Kugwiritsiridwa ntchito kwa polyurea ngati thickener ndi chimodzi mwazofunikira kwambiri pakukula kwamafuta kwazaka zopitilira 30. Mafuta a polyurea amawonetsa kuchita bwino kwambiri pamagwiritsidwe osiyanasiyana onyamula, ndipo m'kanthawi kochepa, adziwika ngati mpira wokhala ndi mafuta oyambira. Kutentha kwapansi Pazikhalidwe zotsika kutentha, makokedwe oyambira amafuta opaka mafuta ndikofunikira kwambiri. Mafuta ena amatha kugwira ntchito moyenera pamene mayendedwe akuyenda, koma amayambitsa kukana kwambiri poyambira. M'makina ena ang'onoang'ono, sizingayambe kutentha kukakhala kotsika kwambiri. M'malo ogwirira ntchito oterowo, pamafunika kuti mafutawo akhale ndi mawonekedwe a kutentha kochepa kuyambira. Ngati kutentha kwa ntchito kuli kwakukulu, mafuta opangira ali ndi ubwino woonekeratu. Mafuta amatha kupangitsa kuti torque yoyambira ndi yothamanga ikhale yaying'ono kwambiri pakutentha kotsika kwa -73°C. Nthawi zina, mafutawa amagwira ntchito bwino kuposa mafuta odzola pankhaniyi. Mfundo yofunikira pamafuta ndikuti kuyambitsa torque sikutanthauza kusinthasintha kwamafuta kapena magwiridwe antchito onse. Ma torque oyambira amakhala ngati ntchito yamafuta enaake, ndipo zimatsimikiziridwa ndi zomwe zachitika.
Kutentha kwakukulu: Kutentha kwakukulu kwamafuta amakono nthawi zambiri kumakhala ntchito yokwanira ya kukhazikika kwamafuta ndi kukana kwa okosijeni kwa mafuta oyambira komanso mphamvu ya oxidation inhibitors. Kutentha kwamafuta amafuta kumatsimikiziridwa ndi kutsika kwamafuta amafuta ndi kapangidwe ka mafuta oyambira. Gulu 28 likuwonetsa kutentha kwamafuta pansi pamikhalidwe yosiyanasiyana yamafuta. Pambuyo pazaka zoyeserera ndi ma bere opaka mafuta, njira zake zoyeserera zikuwonetsa kuti moyo wamafuta opaka mafuta udzakhala ndi theka pakuwonjezeka kulikonse kwa 10 ° C kutentha. Mwachitsanzo, ngati moyo wautumiki wa mafuta pa kutentha kwa 90 ° C ndi maola 2000, pamene kutentha kumakwera kufika 100 ° C, moyo wautumiki umachepetsedwa mpaka pafupifupi maola 1000. Mosiyana ndi zimenezi, mutatha kuchepetsa kutentha kwa 80 ° C, moyo wautumiki ukuyembekezeka kufika maola 4000.