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    • 1. 发明申请
    • Continuously variable belt drive system
    • US20060019781A1
    • 2006-01-26
    • US11220212
    • 2005-09-06
    • Joshua Roby
    • Joshua Roby
    • F16H55/56
    • F16H55/56F16H55/563F16H61/12F16H63/062F16H63/067
    • A belt-type continuously variable transfer system (15) includes a driving pulley assembly (20), a driven pulley assembly (22) and a V-shaped belt (24) engaged to transfer rotary power therebetween. The driven pulley assembly (22) can include a ratio adjustment mechanism (46) that adjusts the position of a rear sheave (40) relative to a forward sheave (42). The adjustment mechanism (46) includes a motor (170) and a worm gear mechanism (171, 172) that rotates an actuation screw (154). Rotation of the actuation screw (154) is reacted by a split nut (158) so that as the screw (154) rotates is translated along the axis (B) of the driven pulley assembly (22). Translation of the actuation screw (154) exerts pressure against the rear sheave (40) to push it toward the forward sheave (42), thereby altering the drive ratio of the pulley assembly. In one feature, the driven pulley assembly (22) includes a fail-safe mechanism (48) that operates when power is supplied to the motor (170) to hold the split nut (158) together. Once power is disrupted, the fail-safe mechanism (48) allows the components (1 58a-c) of the split nut (158) to be separated, disrupting the threaded engagement with the actuation screw (154). At this point, the actuation screw (154) is driven forward by a compression spring (190), thereby driving the rear sheave (40) forward to a predetermined drive ratio position. In another aspect of the invention, the driving pulley assembly (20) includes an idler pulley portion (65) radially inboard from the normal driving sheave surface (29, 31). As the belt speed decreases, the belt (24) migrates downward within the driving pulley assembly (20) until it falls within the idler pulley portion (65). At this point, the belt (24) is isolated from the rotation of the driving pulley assembly (20). The driving pulley assembly (20) also includes a belt tensioning mechanism (32) that maintains proper belt tension at all speeds and drive ratios. The tensioning mechanism (32) relies upon a pivotably mounted centrifugal weight arm (101) to provide tensioning as a function of speed. A compression spring (80) provides axial pressure to maintain belt tension over all drive ratios. The spring (80) acts against a specially curved cam edge (92) on a pivoting lever arm (90), which arm (90) transfers an axial force to the rear sheave (28) of the driven pulley assembly (20).