Pulley and ball nut assembly

An apparatus comprising:

• a ball nut including a first end having a cylindrical shape with a slot formed in an axial direction corresponding to an axis of rotation of the ball nut, the ball nut further including an outer cylindrical surface having a first diameter;
• a pulley mounted on the first end of the ball nut, the pulley including a tab extending inward from an inner cylindrical surface of the pulley, the tab further extending in the axial direction for insertion into the slot, wherein the inner cylindrical surface has a second diameter larger than the first diameter and sized to engage with the outer cylindrical surface in a press fit, wherein the press fit causes an inner face of the pulley to abut a shoulder extending outward from the outer cylindrical surface of the ball nut, the pulley including an outer face on a side opposite to the inner face, the outer face extending radially outward from the inner cylindrical surface perpendicularly to the axis of rotation;
• a circumferential groove formed in a portion of the first end extending beyond the pulley, extending opposite to a direction in which the pulley is press fitted onto the outer cylindrical surface, the groove disposed at a location beyond a furthest extent of the pulley, and beyond the outer face of the pulley after the pulley is mounted on the first end of the ball nut;
• and
• a retaining ring disposed in the circumferential groove to prevent removal of the pulley from the first end of the ball nut.

A pulley and ball nut assembly comprising:

• a ball nut including a first end, the ball nut further including an outer cylindrical surface having a first diameter;
• a pulley mounted on the first end of the ball nut, the pulley having an inner cylindrical surface having a second diameter larger than the first diameter and sized to engage with the outer cylindrical surface in a press fit, wherein the press fit causes an inner face of the pulley to abut a shoulder extending outward from the outer cylindrical surface of the ball nut, the pulley including an outer face on a side opposite to the inner face, the outer face extending radially outward from the inner cylindrical surface perpendicularly to the axis of rotation;
• a circumferential groove formed in a portion of the first end extending beyond the pulley, extending opposite to a direction in which the pulley is press fitted onto the outer cylindrical surface, the groove disposed at a location beyond a furthest extent of the pulley, and beyond the outer face of the pulley after the pulley is mounted on the first end of the ball nut;
• and
• a retaining ring disposed in the circumferential groove to prevent removal of the pulley from the first end of the ball nut, wherein a portion of the ball nut engages with a portion the pulley to prevent relative rotation between the pulley and the ball nut.