Automatic transmission with a separator for removing oil from the surface of a rotary member

An automatic transmission comprising:

• at least one rotary member presenting an outer circumferential surface with adhering oil;
• a rotary member enclosure enclosing said rotary member and defining an interior bounded by an inner circumferential surface surrounding said rotary member;
• an oil reservoir arranged below said rotary member enclosure for collecting and reserving the oil;
• oil separating means for separating the adhering oil from the outer circumferential surface of said rotary member, said oil separating means including a plurality of ridges defined between a plurality of oil grooves formed in said inner circumferential surface, said ridges extending into sufficiently close proximity to the outer circumferential surface of said rotary member to contact and separate the adhering oil from the outer circumferential surface of said rotary member and at least a portion of said plurality of ridges each presenting a smoothly curved edge downstream relative to a direction of rotation of said rotary member;
• and
• spline grooves formed in said inner circumferential surface of said rotary member enclosure, each spline groove opening at one end into one of said oil grooves so that the oil having collected in said oil grooves is drained through said spline grooves.