Continuously variable transmission driving pulley

A driving pulley for a continuously variable transmission comprising:

• a first shaft having a plurality of axially extending first grooves;
• a fixed sheave disposed on the first shaft, the fixed sheave being axially and rotationally fixed relative to the first shaft;
• a second shaft disposed around the first shaft and having a plurality of axially extending second grooves;
• a plurality of ball bearings disposed radially between the first and the second shafts, each one of the plurality of ball bearings being disposed in one of the plurality of first grooves and in a corresponding one of the plurality of second grooves;
• a movable sheave disposed on the second shaft, the movable sheave being axially and rotationally fixed relative to the second shaft, the movable sheave and the second shaft being movable axially relative to the fixed sheave and the first shaft, the movable sheave and the second shaft being rotationally fixed relative to the fixed sheave and the first shaft by the plurality of ball bearings;
• at least one first seal disposed radially between the first and the second shafts and axially between the plurality of ball bearings and the fixed sheave;
• at least one second seal disposed radially between the first and the second shafts and axially between the plurality of ball bearings and an end of the second shaft, the movable sheave being disposed axially between the end of the second shaft and the fixed sheave;
• a cavity defined axially between the at least one first seal and the at least one second seal and radially between the first and the second shafts, the plurality of ball bearings being disposed in the cavity, the cavity being adapted to be filled at least in part with lubricant;
• a housing disposed on the first shaft, the housing being axially and rotationally fixed relative to the first shaft, the movable sheave being disposed axially between the housing and the fixed sheave;
• at least one weighted arm being pivotally connected to one of the movable sheave and the housing,
• the at least one weighted arm pivoting away from the first shaft and pushing against an other one of the movable sheave and the housing as a speed of rotation of the driving pulley increases, thereby moving the movable sheave and the second shaft axially toward the fixed sheave;
• and
• a spring biasing the movable sheave and the second shaft axially away from the fixed sheave.