Patent ID: 7427248
Filing Date: 2008-09-23
Classification: B60Y,F16H

Abstract:
1. A continuously variable transmission for transmitting a rotation of a primary pulley to a secondary pulley through a drive belt and continuously changing a speed ratio between the pulleys, the continuously variable transmission comprising: a fan blade provided to at least one of said primary pulley and said secondary pulley; a case rotatably accommodating said one of the pulleys; a shroud wall formed about a circumference of said one of the pulleys; a scroll surface formed on said shroud wall and said case about a circumference of said one of the pulleys; an intake port for introducing a cooling air into said case; and a clearance in a radial direction of said one of the pulleys between an outermost end of said fan blade and said scroll surface increases with a rotational direction of said fan blade, wherein said shroud wall is positioned as to cover the outermost end of said fan blade such that a flow of said cooling air radially exiting from said outermost end of said fan blade is channeled by said shroud wall until reaching a case defined portion of said scroll surfaced, and wherein said shroud wall has a laterally extending interior surface which promotes the lateral passage of said cooling air exiting from said intake port into contact with said fan blade.