Patent ID: 8813606
Filing Date: 2014-08-26
Classification: F16H,Y10T

Abstract:
1. An automatic transmission comprising: a case having an internal space; a first partition wall provided in the case, the first partition wall forming a boundary between a first chamber and a breather chamber, the first chamber housing a planetary gear unit, the breather chamber being connected to the first chamber, and the breather chamber maintaining equal pressure between outside air and the first chamber; a second partition wall provided in the case, the second partition wall forming a boundary between the breather chamber and an oil pan, and the oil pan storing automatic transmission fluid below the breather chamber; and a third partition wall provided in the case, the third partition wall forming a boundary between the first chamber and the oil pan, wherein the oil pan is located vertically below both of the first chamber and the breather chamber, a first hole and a second hole are formed in the second partition wall, and the first hole is closer to the first chamber than the second hole.