The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 08, 2005
Filed:
Oct. 09, 2001
Joshua L. Roby, Richmond, VA (US);
Joshua L. Roby, Richmond, VA (US);
BorgWarner Inc., Auburn Hills, MI (US);
Abstract
A continuously variable belt drive system includes a driving pulley assembly, a driven pulley assembly and a V-shaped belt engaged to transfer rotary power therebetween. The driven pulley assembly includes a ratio adjustment mechanism that adjusts the position of a rear sheave relative to a forward sheave. The adjustment mechanism includes a motor and a worm gear mechanism that rotates an actuation screw. Rotation of the actuation screw is reacted by a split nut that translates the screw rotates along the axis of the driven pulley assembly. In one feature, the driven pulley assembly includes a fail-safe mechanism that operates when power is supplied to the motor to hold the split nut together. In another aspect of the invention, the driving pulley assembly includes a belt tensioning mechanism that maintains proper belt tension at all speeds and drive ratios.