Patent ID: 11936280
Assignee: KUBOTA CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A liquid-cooled motor comprising:
a motor case;
a motor provided in the motor case;
a motor housing provided in the motor case; and
a water jacket provided in the motor housing, the water jacket having a circular shape to allow coolant to flow in a circumferential direction, wherein
the water jacket includes
a cooling passage in which the coolant flows, the cooling passage having a passage width reduced gradually,
a coolant supply port to supply the coolant to the cooling passage, and
a coolant drain port to drain the coolant from the cooling passage,

the cooling passage includes
at least one straight passage having the passage width reduced as extending in a flow direction,
a nozzle portion provided at a first end of the at least one straight passage, and
a wide portion provided at a second end of the at least one straight passage, the wide portion having a passage width wider than the first end of the at least one straight passage,

the at least one straight passage includes a plurality of straight passages extending in the circumferential direction of the water jacket and juxtaposed in an axial direction of the water jacket, and
in the plurality of straight passages juxtaposed in the axial direction of the water jacket, the adjoining straight passages are connected to each other via the nozzle portion and the wide portion.