BREATHER DEVICE FOR MOTOR CASE

A breather device comprises a substantially enclosed breather chamber (132) defined between a first end wall (102D) of a motor case and a second end wall (82B) of a gear case opposing each other, a motor communication hole (122) provided in the first end wall, an external communication passage (124) formed in the motor case or the gear case at a position lower than the motor communication hole so as to communicate the breather chamber to outside, and a partition wall (128) extending laterally across the breather chamber and projecting from one of the first end wall and the second wall toward the opposing end wall so as to define a small gap (130) between the partition wall and the opposing end wall, the partition wall being positioned between the motor communication hole and the external communication passage.