Dynamically vented crankshaft seal and systems and methods thereof

A rotatable shaft assembly comprising:

• a rotatable shaft defining a shaft axis of rotation;
• a one-piece unitary wear sleeve circumscribing the rotatable shaft and being directly mounted on the rotatable shaft, a first side of the one-piece unitary wear sleeve facing and being at an outer surface of the rotatable shaft, wherein the one-piece unitary wear sleeve is purely cylindrical in the side profile view of the seal assembly;
• and
• a seal assembly circumscribing the rotatable shaft, wherein the seal assembly includes:
• a housing,
• a main seal mounted to the housing, the main seal including a mounting portion and a main seal lip, and the main seal being curved in a side profile view of the seal assembly,
• a dust seal having a mounting portion, and
• a plurality of vents circumferentially spaced from each other about the seal assembly,
• wherein each of the vents extends from outside the rotatable shaft assembly to a circumferential seal cavity between the main seal and the dust seal to prevent or minimize vacuum formation in the circumferential seal cavity,
• wherein a second side of the one-piece unitary wear sleeve opposite the first side thereof directly faces the circumferential seal cavity,
• wherein each of the vents is formed entirely in the one-piece, unitary wear sleeve, and
• wherein the one-piece, unitary wear sleeve includes a channel extending from a distal end of the one-piece, unitary wear sleeve that runs parallel to the shaft axis and an opening leading from the channel to the circumferential seal cavity forming each of the vents.