Patent ID: 6730008
Filing Date: 2004-05-04
Classification: F16C

Abstract:
A differential shaft for a strip-producing machine, comprising a differential shaft mainly made up of a shaft core, a multiple of rolling tubes and partition rings each alternatively positioned with the other and sleeve joined in a sequence onto said shaft core thereof, and a securing plug and a fixing plug sleeve joined at both ends of said shaft core thereof respectively; said differential shaft being characterized by that,the upper and lower periphery of said shaft core being symmetrically defined by a pair of stepwise retaining recesses each having a step disposed at the bottom thereof; each of said partition rings having a pair of positioning pins symmetrically disposed at the internal upper and lower periphery thereof; each said positioning pin having a transversely rotated pivot piece disposed at the bottom thereof; whereby, the positioning pins of said partition rings are matched to the stepwise retaining recesses of said shaft core with said transversely rotated pivot pieces thereof abutting against the steps of said stepwise retaining recesses for stable location of said partition rings onto said core shaft thereof; a ring gap A is formed at the space defined by the internal periphery of said partition ring and the external periphery of said shaft core, preventing the direct contact of said partition rings and said shaft core and thus reducing the friction thereof to the minimum when the rolling tubes proceed with the producing of strips thereof, effectively prolonging their lifespan in use; moreover, when said rolling tubes and said partition rings are clamped tight from one end of said shaft core via said fixing plug for location, the pivot pieces of said partition rings will transversely move at the steps of said stepwise retaining recesses thereof, distributing the clamping force evenly onto each rolling tube for more smooth and efficient rolling movement thereof.