Dangane da abin hawa na injin, ko mu masu kera motoci ne ko masu amfani da motoci, duk mun san cewa ga injinan da aka ɗora nauyi, za a yi amfani da na'urorin nadi na siliki a ƙarshen mashin ɗin, kuma musamman manyan motoci masu nauyi da nauyi, za a yi amfani da igiyoyin zamiya.
A cikin ainihin tsarin ɗaukar zaɓi da aikace-aikacen, an gano cewa wasu injina za su sami firgita a bayyane a ƙarƙashin yanayin rashin ɗaukar nauyi, amma za su zama karɓuwa a ƙarƙashin yanayin kaya. Wannan shine nazarin dangantakar da ta dace tsakanin zaɓin ɗaukar nauyi da girman kaya wanda muke magana akai a yau. Don ƙarshen shaft na injuna masu nauyi, lokacin zabar birgima, za a karɓi tsari mai ɗaukar hoto biyu tare da ɗigon abin nadi na silindi a ƙarshen tsawo na shaft da ƙananan ƙwallon ƙafa a ƙarshen mara amfani. Don lokuta tare da matsananciyar matsayi na axial, za a yi amfani da nau'i mai nau'i uku, wato, nau'i mai nau'i biyu tare da ball ɗaya da kuma shafi ɗaya a ƙarshen shaft, kuma ana amfani da ball bearing a ƙarshen madaidaicin madaidaicin; don motoci masu ɗaukar nauyi na yau da kullun, musamman ƙananan injuna, ana amfani da tsari mai ɗaukar hoto guda biyu tare da ɗigon ƙwallon ƙafa a ƙarshen duka; wannan shine ainihin ka'ida don zabar lodin motoci da samfura masu ɗaukar nauyi.
Baya ga zaɓin nau'ikan nau'ikan motsi, zaɓin ƙayyadaddun ƙayyadaddun mashin kuma yana da mahimmanci musamman, wato, nauyin da ɗaukar nauyi zai iya jurewa ya kamata ya dace da nauyin injin ɗin, kuma ƙayyadaddun ƙayyadaddun ya kamata a ƙara ko rage gwargwadon yanayin aikin motar. Don ingantattun masana'antun masana'anta, suna da cikakkiyar ikon samarwa abokan ciniki mafita zaɓin zaɓi da yin tsari na musamman ko gyare-gyaren girma dangane da ainihin yanayin aiki na injin mai amfani.
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