Ụdị ihe eji eme ihe metụtara ngwaọrụ ịhịa aka n'ahụ nwere Ngwa ịhịa aka n'ahụ mkpịsị aka, nke nwere moto, igbe gia worm, ogwe mmepụta, efere mandrel oblique na isi ịhịa aka n'ahụ. The moto mmepụta draịva mmepụta aro mgbe decelerating site worm gia igbe, na oblique mandrel efere edobere na mmepụta aro na-akpali ndị ịhịa aka n'ahụ isi na-efegharị na undulating ngagharị. Ihe e ji mara bụ: isi ịhịa aka n'ahụ jikọtara ya na mkpịsị aka mkpịsị aka, mkpịsị aka mkpịsị aka na-ejedebe na isi nrụgide mkpịsị aka; N'ọnụ nke isi ịhịa aka n'ahụ na-agbatị obere lever, nke a na-amachibido na igbe gia worm. A na-ejikọta isi ịhịa aka n'ahụ nke ụdị ịba uru na isi mkpịsị aka mkpịsị aka, ma n'otu oge ahụ ịhịa aka n'ahụ na-adịghị mma na ịhịa aka n'ahụ, njedebe dị anya na-ejikwa ọrụ ịpị aka, na-emepụta usoro ịhịa aka n'ahụ pụrụ iche; Ọzọkwa, a na-agbakwunye moto na-ama jijiji n'isi mkpịsị aka iji meziwanye mmetụta mkpịsị aka.
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