GEAR SYSTEM FOR ELECTRIC VEHICLE

摘要

A power transmission device for a vehicle is comprised of a motor including a rotor shaft and a stator having an electromagnetic coil; an inverter configured to generate an alternating current, the inverter being connected with the coil to controllably rotate the rotor shaft relative to the stator; a gear set including an input shaft coupled with and rotated by the rotor shaft, an output shaft and gears so meshed as to transmit torque of the input shaft to the output shaft; and a grounding path electrically connecting a part of the gear set with a body of the vehicle, the part being so disposed as to have the input shaft electrically interposed between the part and the rotor shaft.

主权项

1. A gear system for a vehicle used in combination with an inverter and a motor electrically connected to and driven by the inverter, comprising:
a gear casing defining a room spatially separate from a room housing the inverter and the motor; a gear set confined in the gear casing, the gear set including an input shaft coupled with and rotated by the motor, an output shaft, meshed gears, and one or more counter shafts driven only by the meshed gears to mediate transmission of the torque from the input shaft to the output shaft; and a grounding path electrically connecting a connection point on the one or more counter shafts with a body of the vehicle, the connection point being so selected as to interpose any engagement among the meshed gears between the input shaft and the connection point, whereby the grounding path functions as a resistor for attenuating radio noise flowing from the inverter beyond the connection point toward the output shaft.