TH41253B - Motor cooling structure for electric vehicles - Google Patents

Abstract

DC60 In order to provide a motor cooling structure for electric vehicles that can efficiently cool the drive motor in the power unit of electric vehicles, a power unit cover plate 59a with an air filter 41 is installed on the left surface of the power unit 59 near the fan 54b, and a transfer gap is defined between the rear part of the power unit cover plate 59a and the power unit 59. The power unit cover plate 59a is formed with a cooling air inlet 59b facing the transfer gap above. When the fan 54b rotates synchronously with the crankshaft 22, the outer cooling air is taken from the cooling air inlet 59b into the power unit cover plate 59a, and then flows through the air filter 41 to enter the power unit 59, thus cooling the CVT 23 in a forced manner. Afterward, the cooling air portion introduced into the power unit 59 is discharged from the center air outlet 42 to the outside of the power unit 59, and the remaining cooling air is attracted to the following portion of the CVT 23. In order to provide a motor cooling structure for electric vehicles that can efficiently cool the drive motor in the power unit of electric vehicles, a power unit cover plate 59a, which has an air filter 41, is installed on the left surface of the power unit 59 near the fan 54b, and a transfer gap is defined between the rear part of the power unit cover plate 59a and the power unit 59. The power unit cover plate 59a is formed together with the side of the cooling air 59b facing the transfer gap above. When the fan 54b rotates synchronously with the crankshaft 22, the cooling air outside The cooling air is introduced from the inlet 59b into the power unit cover 59a and then forced through the air filter 41 to enter the power unit 59, cooling the CVT 23 in a forced manner. Thereafter, a portion of the cooling air introduced into the power unit 59 is discharged from the center air outlet 42 to the outside of the power unit 59, and the remaining cooling air is drawn to the CVT portion 23.

Claims (5)

1. Motor Cooling Structure for Electric Vehicles. The motor cooling structure is composed of: the motor (21b) connected to the drive wheel (WR); the power unit (59) which houses the said drive motor (21b); the air inlet (59b) for bringing outside air in as cooling air into the said power unit (59); and the air outlet (43) which is provided in the vicinity of the said drive motor (21b), where the said air inlet (59b) and the said air outlet (43) are connected. Through the gap between the stator (84) and the rotor (83) of the aforementioned drive motor (21b), where the aforementioned power unit (59) is further contained: a continuously variable transmission (23) which has a drive pulley (58), a driven pulley (62), and a belt which is wrapped between the aforementioned drive pulley (58) and the aforementioned driven pulley (62), with the drive pulley (58) attached to the crankshaft (22) of the engine (20), and the drive motor (21b) positioned on one side of the aforementioned driven pulley (62); an air intake fan (54b) which is provided axially with the aforementioned drive pulley (58); and a drive shaft (60) which connects the aforementioned drive motor (21b) and the aforementioned driven pulley (62) axially, where the aforementioned air inlet (59b) is provided in the vicinity of the aforementioned air intake fan (54b). 2. The motor cooling structure for the electric vehicle under claim 1, where such air outlet (43) is provided in the protruding area of the drive motor (21b) as viewed in the side view of such vehicle. 3. The motor cooling structure for electric vehicles under either claim 1 or 2, which is further incorporated with the enclosed assembly (46) for the closure of the air outlet (43) such as, with the predefined gaps which are defined as boundaries between them. 4. The motor cooling structure for the electric vehicle according to claim 1, whereby the said motor cooling structure is further comprised of: an outer rotor motor (21a) in which the stator (51) and rotor (52) are provided around the said stator (51); and a fan (54a) which is connected axially with the said rotor (52) in an axially opposite relationship with the said rotor (52a); and a predefined gap which is bounded between the said rotor (52a) and the said fan (54a). 5. Motor cooling structure for electric vehicles pursuant to claim paragraph 4, where such clamp (52a) of the said rotor is formed with ventilation holes (85).