Patent ID: 7392872

Claim:
A power assisted vehicle comprising: a frame body; a pushing handlebar pivoting to said frame body; wherein, a positioning member attaching both said frame body and said pushing handlebar, and said pushing handlebar being adjusted by tightening or loosening said positioning member; a wheel portion having a fastening frame pivoted to said frame body, and having at least two driven wheels disposed on said fastening frame; and an auxiliary propelling device having a transmission portion attached to said frame body and an auxiliary wheel driven by said transmission portion; wherein said transmission portion comprising a supporting base connecting to said frame body, two power sources juxtaposed on said supporting base rotating in an opposite direction when in operation, a transmission shaft protruding from each of said two power sources, and two friction pieces, each with the shape of a cone and disposed to each said transmission shaft; wherein said supporting base having a fastening shaft extending from both sides thereof, and said two power sources having different rotation directions to allow said two friction pieces to have different rotation directions; said auxiliary wheel, driven by said transmission portion and wrapping said supporting base, further comprising a wheel rim disposed around said supporting base, a friction ring fastened to said wheel rim and clamped by said two friction pieces for being driven by said two power sources, which in turn drives said wheel rim, a tire fastened to said wheel rim and said friction ring, and two cover bodies attached to two sides of said wheel rim.