Patent ID: 7866430

Claim:
A vehicle with two parallel wheels comprising: a step base where a driver rides on; a vehicle body for supporting the step base; a pair of wheels coaxially arranged in parallel to each other and rotatably supported on the vehicle body; a pair of wheel drive portions for independently rotating the pair of wheels; and a pair of step run-on assist mechanisms configured to change an amount of assistance of run-on action to a step provided by the run-on assist mechanisms depending on a collision speed to the step, each of the pair of step run-on assist mechanisms being provided for each of the pair of wheels; wherein each of the pair of step run-on assist mechanisms includes: an assisting turning member having a circular support surface of a curvature radius larger than that of the wheels, a turning center of the assisting turning member being arranged ahead of a rotating center of the wheels in the vehicle with respect to a travel direction of the vehicle; a link member that rotatably supports the assisting turning member such that a rotation axis of the assisting turning member is perpendicular to the travel direction of the vehicle, one end of the link member being rotatably supported on the step base or the vehicle body; and a retaining force changing device that changes an amount of a force that acts on another end of the link member depending on the collision speed of the assisting turning member to the step.