Patent ID: 6260681
Filing Date: 2001-07-17
Classification: F16D

Abstract:
A free-wheel hub transmission mechanism comprising:an axle having left and right axle portions;a tubular spoke-mounting barrel having a right end portion and defining an axially extending through-hole therethrough, said axle extending co-axially through said through-hole with said right axle portion projecting outwardly from said right end portion of said spoke-mounting barrel;a sprocket mounting member sleeved around said right axle portion of said axle adjacent to said right end portion of said spoke-mounting barrel, said sprocket mounting member includingan outer shell coupled with said right end portion of said spoke-mounting barrel, and having an inner wall that is formed with a proximate small-diameter wall section relative to said right end portion of said spoke-mounting barrel and a distal large-diameter wall section, thereby defining a shoulder between said small and large-diameter wall sections,a left bearing unit disposed inside said large-diameter wall section, and having an inner race sleeved around said right axle portion of said axle, and an outer race which has a left end surface that abuts against said shoulder of said outer shell, and an outer circumferential surface that is in tight engagement with said outer shell, said inner race of said left bearing unit having left and right end surfaces,a tubular sleeve disposed inside said large-diameter wall section and around said right axle portion of said axle, said tubular sleeve having a left sleeve section with an abutment surface abutting against said right end surface of said inner race of said left bearing unit, and a right sleeve section extending axially from said left sleeve section away from said left bearing unit,a right bearing unit disposed inside said large-diameter wall section and spaced apart axially from said left bearing unit, said right bearing unit having an outer race in tight engagement with said outer shell and an inner race that is disposed around said right sleeve section of said tubular sleeve and that has left and right end surfaces, anda restricting spacer unit disposed inside said large-diameter wall section to restrict axial displacement of said left and right bearing units relative to each other, thereby immobilizing said inner races of said left and right bearing units relative to said tubular sleeve; anda clutch assembly disposed inside said right end portion of said spoke-mounting barrel and operably coupled with said outer shell so as to permit co-rotation of said spoke-mounting barrel with said sprocket mounting member in only a single direction.