Crankshaft mangrupikeun salah sahiji bagian penting dina mesin durukan internal, nyaéta tulang tonggong mesin, mangrupikeun bagian konci pikeun nanggung beban dampak sareng ngirimkeun kakuatan.
Crankshaft utamana diwangun ku tungtung hareup crankshaft, beuheung aci utama, jurnal rod nyambungkeun, engkol, blok kasaimbangan, tungtung tukang crankshaft, jsb fungsi utamana nyaéta pikeun ngarobah tekanan gas dikirimkeun ku grup rod piston nyambungkeun kana torsi kaluaran éksternal, sarta bisa ngajalankeun mékanisme klep tina mesin durukan internal sarta sagala rupa asesoris séjén. Lingkungan kerja sareng setrés crankshaft pisan rumit, sareng éta kakeunaan pangaruh sanyawa parobahan périodik dina tekanan gas, gaya centrifugal sareng gaya inersia nalika damel. Ku alatan éta, dina ngolah jeung manufaktur, akurasi diménsi, akurasi posisi jeung roughness permukaan unggal bagian tina crankshaft ngabogaan sarat luhur.
Crankshaft umumna tuang tina baja karbon sedeng, baja alloy karbon sedeng atanapi beusi ductile
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