Patent ID: 7192040

Claim:
A drive mechanism for a vehicle comprising: a supporting platform having a first end, a second end, and a longitudinal axis perpendicular to the first and second ends; an upright tube provided at a first end of the supporting platform and operatively connected with the supporting platform, and having a handle frame fitted on a top end thereof; a power supply means; a driving means electrically connected with the power supply means; at least two driving wheels driven by the driving means, wherein the driving wheels are operatively mounted at opposite sides of the first end of the supporting platform and parallel to the longitudinal axis; at least one steering wheel, which is provided at the second end of the supporting platform; a steering control arrangement installed in the supporting platform, the steering control arrangement having a first end thereof fixedly connected with a steering post provided at a lower end of the upright tube, and at least one second end thereof connected with at least one steering knuckle, and wherein the at least one steering wheel is connected to the at least one steering knuckle, thereby the torsion of the upright tube being transmitted to the at least one steering knuckle via the steering control arrangement to drive the at least one steering wheel to rotate in order to enable the electric-driven vehicle to turn correspondingly; and wherein the steering control arrangement comprises a driving rocker having a first end thereof fixedly connected with the steering post provided at the lower end of the upright tube so as to turn along with the upright tube, a pull-rod having a first end thereof pivotally connected with a second end of the driving rocker, an L-shaped rocker having a pivot center pivotally connected with the supporting platform, and a first end thereof pivotally connected with a second end of the pull-rod, wherein the steering control arrangement further comprises at least one link rod having a first end thereof pivotally connected with a second end of the L-shaped rocker and at least one driven rocker having a first end thereof pivotally connected with a second end of the at least one link rod, and a second end thereof fixedly connected with the steering knuckle so as to drive the steering knuckle to rotate.