| 摘要 |
<p>An axle (28) has wheels (30, 32) and a wheel turbine (34) and two reversible electric motors (36, 36). The motors are on the axle, one motor between each of the wheels and the wheel turbine. Each reversible electric motor is adapted to engage and disengage with the wheel turbine. One of two batteries (46, 48) is coupled to each e lectric motor.</p> |
