Retainer systems for ground engaging tools

A retainer bushing for use with a lock in a ground engaging tool, comprising:

• a skirt extending around a retainer axis, the skirt including:
• an outer surface configured to mate with a lock cavity of the ground engaging tool;
• and
• an inner surface configured to rotatably receive an outer surface of the lock;
• and
• a detent projection extending radially inward from the inner surface and configured to engage a detent recess of the lock to releasably hold the lock,
• wherein a portion of the outer surface directly opposite to a portion of the inner surface from which the detent projection extends comprises a frustoconical surface.

A retainer system for a ground engaging tool, comprising;

• a lock including:
• a head having a tool interface;
• a skirt extending from the head and including an outer surface;
• and
• a detent recess formed on the outer surface of the skirt;
• and
• a retainer bushing including a skirt extending around a retainer axis, the skirt including:
• an outer surface configured to mate with a lock cavity of the ground engaging tool;
• an inner surface configured to rotatably receive the outer surface of the lock;
• and
• a detent projection extending radially inward from the inner surface with respect to the retainer axis and configured to engage the detent recess of the lock,
• wherein the detent projection comprises a convex surface with a substantially constant radius, and
• wherein a center of the radius of the convex surface is positioned at a first distance from the retainer axis that is greater than a second distance between the retainer axis and the outer surface of the skirt.