| 摘要 |
A ball screw in a continuously variable speed transmission has an axially immovable pulley half ( 2 ) and axially movable pulley half ( 3 ) both mounted on a rotary shaft ( 4 ). The axially movable pulley half ( 3 ) is moved by a ball screw ( 20 ) so as to infinitely vary the belt wrapping radius and thus the transmission speed. A nut ( 22 ), forming one part of the ball screw ( 20 ), is immovably secured in both axial and rotational directions. A screw shaft ( 21 ), forming the other part of the ball screw ( 20 ), is movable in both axial and rotational directions. The screw shaft 21 is connected to the axially movable pulley half ( 3 ). The axially movable pulley half ( 3 ) is axially moved by rotating the screw shaft ( 21 ).
|
