Patent ID: 8430777
Filing Date: 2013-04-30
Classification: B60K,B60L,Y02T

Abstract:
1. A power transmission mechanism for parallel hybrid vehicle in which an engine, a main clutch, a motor/generator, a transmission, and a final reduction gear are arranged coaxially and powers of the engine and the motor/generator are used in combination, the power transmission mechanism comprising: a motor output shaft of the motor/generator rotatable separately from an engine drive shaft system extending from the main clutch to the transmission; a motor-brake mounted on one end side of the motor output shaft to release/fix the motor output shaft; a planetary gear mechanism provided between another end side of the motor output shaft and the engine drive shaft system and including a sun gear provided on the other end side of the motor output shaft, an outer gear provided on the engine drive shaft system and having a gear ratio to the sun gear of 1:1, a plurality of planetary gears with which the sun gear and the outer gear are engaged, and a planetary carrier picking up orbital motions of the planetary gears; and a gear brake mounted on one end side of the planetary carrier to release/fix the planetary carrier, wherein: when the main clutch and the gear brake are fixed and the motor-brake is released, a driving force of the motor/generator is transmitted from the planetary gear mechanism to the engine drive shaft system to be combined with a driving force of the engine; when the main clutch and the motor-brake are released and the gear brake is fixed, only the driving force of the motor/generator is transmitted from the engine drive shaft system to the transmission, and the motor/generator reversely operates to apply a regenerative brake during braking of the vehicle; and when the main clutch and the motor-brake are fixed and the gear brake is released, only the driving force of the engine is transmitted from the engine drive shaft system to the transmission.