Kev ua haujlwm stroke ntawm lub tshuab hluav taws xob tau ua tiav los ntawm txhua lub tog raj kheej tig, yog li lub zog ua haujlwm ntawm lub crankshaft kuj tseem cuam tshuam thiab tsis sib npaug. Yuav kom kis tau cov rog no zoo, kev sib hloov ntawm lub crankshaft nws tus kheej yuav tsum ruaj khov. Yuav kom nws ruaj khov, lub crankshaft yuav tsum sib npaug. Lub crankshaft muaj feem xyuam nrog kev npaj ntawm tus naj npawb ntawm lub tog raj kheej.

Rau crankshafts ntawm peb-, plaub-, tsib-, thiab xya-lub tog raj kheej diesel xyaw, qhov sib npaug yuav tsum tau ua kom lub crankshaft tau qhov sib npaug qhov hnyav. Qhov loj thiab cov duab ntawm qhov sib npaug qhov hnyav yog xam thaum tsim. Feem ntau ntawm qhov sib npaug ntawm qhov hnyav ntawm crankshafts txuas nrog lub crankshaft thaum forging lossis casting. Hauv ib qho. Txawm li cas los xij, qhov sib npaug ntawm qhov hnyav ntawm qee lub cav diesel yog bolted rau crankshaft. Vim tias qhov ntim loj ntawm cov khoom sib npaug no, bolt fastening feem ntau siv thaum qhov chaw teeb tsa tsis txaus.

Rau ntsug rau lub tog raj kheej diesel cav nrog lub crank lub kaum sab xis ntawm 120, qhov sib npaug ntawm cov nyhuv yog qhov zoo. Nws zoo nkaus li tias tsis tas yuav txhim kho qhov sib npaug ntawm qhov hnyav. Txawm li cas los xij, qhov sib npaug no yog qhov tshwm sim ntawm lub zog inertia ntawm lub crankshaft lossis lub tog raj kheej thaiv. Raws li rau lub cav diesel, tseem muaj ntau inertial quab yuam, uas tej zaum yuav ua rau lub ntsiab bearing yuav overloaded los yog lub tog raj kheej thaiv kom vibrate.

Txhawm rau kom tsis txhob muaj qhov ua tsis tiav, txhua feem ntawm lub crankshaft muaj lub zog loj inertial, yog li tseem muaj qhov sib npaug. Rau qhov sib npaug ntawm qhov hnyav uas txuas nrog bolts, thaum lub crankshaft xav tau hauv av, qhov sib npaug ntawm qhov hnyav yuav tsum tau muab tshem tawm thiab cim los tiv thaiv kev teeb tsa tsis raug los ntawm kev sib tsoo thaum rov nruab.