Patent ID: 8015898
Filing Date: 2011-09-13
Classification: F16H,Y10T

Abstract:
1. An air breather structure for an automatic transmission, comprising: a transmission case that houses a power train including a plurality of friction engagement devices to achieve a plurality of gear ratios; an extension case that houses a rotational member rotatably attached to an output shaft of the power train, the extension case and the transmission case being united with each other to constitute an automatic transmission housing; a breather chamber formed at the top of the automatic transmission housing, the breather chamber being formed with an air vent for communication with outside air; and an end wall partitioning the transmission case and the extension case therebetween to define a transmission case-side space and an extension case-side space, wherein the automatic transmission housing is formed with transmission case-side communication passages through which the breather chamber is allowed to communicate with the transmission case-side space, and an extension case-side communication passage through which the breather chamber is allowed to communicate with the extension case-side space, wherein the transmission case is divided in an axial direction by a bulkhead into first and second chambers, and wherein the transmission case-side communication passage includes a first communication passage through which the breather chamber is allowed to communicate with the first chamber, and a second communication passage through which the breather chamber is allowed to communicate with the second chamber.