Compliantly mounted motor assembly utilizing dual levels of vibration isolation

摘要

A dual level, vibration isolation system is provided that isolates a vehicle in general, and the vehicle's passenger cabin in particular, from the vibrations generated by the vehicle's motor during normal operation. The first isolation level uses a first plurality of isolation bushings to mount the motor assembly to a first portion of the battery pack. The second isolation level uses a second plurality of isolation bushings to mount the first portion of the battery pack either directly to the vehicle or indirectly to the vehicle via a second portion of the battery pack. In addition to providing two levels of vibration isolation, this compliant mounting scheme allows the mass of the battery pack to absorb and damp out undesirable rotational oscillations caused by the motor, especially when the motor is undergoing strong acceleration or deceleration.

主权项

1. A dual level, vibration isolation system for an electric vehicle, comprising:
a motor assembly enclosure, wherein an electric motor is disposed within said motor assembly enclosure, and wherein said electric motor provides propulsive power to said electric vehicle; a battery pack; a plurality of motor assembly support members, wherein a first end portion of each of said plurality of motor assembly support members is rigidly coupled to said motor assembly enclosure, wherein a second end portion of each of said plurality of motor assembly support members is compliantly coupled to a first portion of said battery pack using a first plurality of flexible bushings, and wherein said plurality of motor assembly support members maintain said motor assembly enclosure at a distance from said first portion of said battery pack; and a plurality of compliant battery pack mounting members, wherein said plurality of compliant battery pack mounting members compliantly couple said first portion of said battery pack to a second portion of said battery pack using a second plurality of flexible bushings, and wherein said second portion of said battery pack is rigidly coupled to a structure of said electric vehicle using a plurality of non-compliant battery pack mounting members.