Patent ID: 6264285
Filing Date: 2001-07-24
Classification: F16D

Abstract:
A free-wheel hub transmission mechanism comprising:an axle having left and right axle portions;a tubular spoke-mounting barrel having an internally threaded right end portion and an inner wall defining an axially extending through-hole, 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, and including an outer shell and an inner shell disposed rotatably within said outer shell around said right axle portion, said inner shell having a barrel-coupling portion, which extends into said spoke-mounting barrel and which has a central bore with a small-diameter outer section, a large-diameter inner section having a diameter larger than that of said small-diameter outer section, and a first shoulder between said outer and inner sections of said central bore in said inner shell;a tubular locking member disposed within said inner shell, and having an enlarged right end section that is disposed in said large-diameter inner section and that has an outer diameter greater than the diameter of said small-diameter outer section of said central bore for preventing removal of said locking member from said inner shell, and an externally threaded left end section that engages threadedly said right end portion of said spoke-mounting barrel, thereby preventing axial movement of said sprocket mounting member relative to said spoke-mounting barrel, said locking member further having two open-ended axially extending slots at a right end thereof so as to split said enlarged right end section into two parts; andmeans for preventing relative rotation between said sprocket mounting member and said spoke-mounting barrel.