| 摘要 |
PURPOSE: An air-breathing device of an automatic transmission is provided to prevent transmutation of an actuating fluid by water coming in through a passage of a transmission case by installing an opening and shutting structure to the passage. CONSTITUTION: An air-breathing device of an automatic transmission comprises a through hole(12) formed to the upper side of a transmission case(10), to allow communication with the outside; a breather pipe(14) of a hollow shape fixed in the through hole; and an opening and shutting structure(18) installed inside the breather pipe, to make the inside of the transmission case selectively communicate with the outside only when the inner pressure of the transmission case rises. The opening and shutting structure comprises magnetic substances(18a) fixed to the bottom part in the breather pipe; a moving member(18b) disposed above the magnetic substances; and through holes(14a) formed at positions higher than the magnetic substances, on the side of the breather pipe. |
