US 12,407,224 B2
Motor oil cooling structure
Masahiro Kosaka, Ebina (JP)
Assigned to JATCO LTD, Fuji (JP)
Appl. No. 17/272,484
Filed by JATCO Ltd, Fuji (JP)
PCT Filed Nov. 8, 2019, PCT No. PCT/JP2019/043815
§ 371(c)(1), (2) Date Mar. 1, 2021,
PCT Pub. No. WO2020/105467, PCT Pub. Date May 28, 2020.
Claims priority of application No. 2018-217063 (JP), filed on Nov. 20, 2018.
Prior Publication US 2021/0328480 A1, Oct. 21, 2021
Int. Cl. H02K 9/19 (2006.01)
CPC H02K 9/19 (2013.01) 6 Claims
OG exemplary drawing
 
1. A motor oil-cooling structure for cooling coils with use of oil, wherein the coils are wound around split stator cores of a motor, wherein the motor includes a motor case, a rotor rotatably supported by the motor case, and a stator including the split stator cores fixed to the motor case and arranged along a cylindrical outer periphery of the rotor, the motor oil-cooling structure comprising:
injection holes arranged in a circumferential direction of the split stator cores on a plane orthogonal to a motor axis so as to axially face the split stator cores,
wherein:
each of the injection holes is structured to inject oil toward a corresponding one of coil gaps each of which is formed between two of the split stator cores adjacent to each other;
each of the injection holes is positioned to be circumferentially shifted from a position to face the corresponding one of the coil gaps; and
each of the injection holes is structured to inject oil in a direction inclined by a circumferential inclination angle with respect to a direction of the motor axis, such that the oil injected from the injection holes is directed to side faces of the coils through the coil gaps.