US 12,273,003 B2
Breather device for motor case
Takuya Matsumoto, Saitama (JP); Yoshitaka Ota, Saitama (JP); and Atsushi Moroi, Saitama (JP)
Assigned to HONDA MOTOR CO., LTD., Tokyo (JP)
Filed by HONDA MOTOR CO., LTD., Tokyo (JP)
Filed on May 24, 2023, as Appl. No. 18/322,793.
Claims priority of application No. 2022-114429 (JP), filed on Jul. 18, 2022.
Prior Publication US 2024/0022133 A1, Jan. 18, 2024
Int. Cl. H02K 5/10 (2006.01); H02K 7/116 (2006.01)
CPC H02K 5/10 (2013.01) [H02K 7/1166 (2013.01); H02K 2205/09 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A breather device for a motor case of an electric motor, the motor case being connected to a gear case that receives a gear train therein, wherein the motor case and the gear case are respectively provided with a first end wall and a second end wall, that oppose each other, and an output shaft of the electric motor and an input shaft of the gear train are passed through the first end wall and the second end wall, respectively, and are connected to each other in a torque transmitting relationship,
the breather device comprising:
a breather chamber defined between the first end wall and the second end wall in a substantially enclosed manner;
a motor communication hole provided in the first end wall so as to communicate an interior of the motor case with the breather chamber;
an external communication passage formed in a wall of 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 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 between the partition wall and the opposing end wall, the partition wall being positioned between the motor communication hole and the external communication passage.