Motor cooling structure for electric vehicle

• Main Authors: OZEKI, TAKASHI, IIMURO, AKIHIRO, TSUKADA, YOSHIAKI, ISHIKAWA, TOMOMI
• Format: Patent
• Language: English; French; German
• Published: 08.02.2006
• Subjects: ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS INVEHICLES; ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OFTRANSMISSIONS IN VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GASEXHAUST OR FUEL SUPPLY OF PROPULSION UNITS, IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; BLASTING; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; CYCLES; DYNAMO-ELECTRIC MACHINES; ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES; ELECTRICITY; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; GENERATION; HEATING; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS; LIGHTING; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; POWERED PROPULSION OF SLEDGES OR; RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; THERMAL INSULATION IN GENERAL; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES; TRANSPORTING; VEHICLES IN GENERAL; WEAPONS

The invention provides a motor cooling structure for an electric vehicle which can efficiently cool a driving motor in a power unit case of the electric vehicle. According to the invention, a transmission case cover 59a having an air filter 41 is mounted on the left side surface of a transmission case 59 at a portion adjacent to a fan 54b, and a ventilation gap is defined between a rear portion of the transmission case cover 59a and the transmission case 59. The transmission case cover 59a is formed with a cooling air inlet 59b facing the above ventilation gap. When the fan 54b is rotated in synchronism with a crankshaft 22, an outside cooling air is introduced from the cooling air inlet 59b into the transmission case cover 59a and is then passed through the air filter 41 to enter the transmission case 59, thereby forcibly cooling a CVT 23. Thereafter, a part of the cooling air introduced into the transmission case 59 is discharged from a central air outlet 42 to the outside of the transmission case 59, and the remaining cooling air is drawn to the driven portion of the CVT 23.