A mobility Vehicle compose a base frame as main support, a seat unit, a control unit and a power drive transmission unit. The front frame has a curve, beneath the curve frame compose min. 3 rows roller toward back base frame.The base frame at rear has pair miti frame arm. The frame arm is ridge frame arm from center extend outward as radius. At end of Radius frame arm compose a wheel (named: Auxiliary Wheel). The number of frame arms from center minimum is one, we use three frame arms with wheel (Auxiliary Wheel) as example to describe the invention but not limited to.The power drive transmitted the power to the Auxiliary Wheel through the frame arm and make the vehicle move forward/backward/turns.When the obstacle curb/step encounter during ride, by switching an leaver to change the power drive swift transmission toward ridged frame arms. The ridge frame arms turn as main wheel that can overcome the obstacle or climb the step/steps.一種電動代步車,主要係包含車架、設於車架之座椅及操控單元,以及傳動單元。其中,車架的前緣係設為上仰之彎弧段,於該彎弧段底緣設有複數排由前向後連續延伸之滑輪,並於該彎弧段略後方的兩側分別設有主輪,車架的後緣兩側係分別設有同心軸叉輪單元,使各同心軸叉輪單元由中心向外延伸且在圓周方向相隔的複數支夾臂,於各夾臂端部設有副輪。藉由操控單元的操控,使傳動單元帶動同心軸叉輪單元之副輪的轉動,從而使電動代步車得以於平坦路面行走,或藉由操控單元的操控,使傳動單元帶動同心軸叉輪單元之夾臂轉動,使電動代步車得以構成爬坡或攀爬樓梯之功能。1‧‧‧車架11‧‧‧彎弧段12‧‧‧滑輪13‧‧‧主輪2‧‧‧操控單元21‧‧‧握把22‧‧‧壓桿3‧‧‧座椅31‧‧‧地球儀水平裝置4‧‧‧控制電路5‧‧‧傳動單元6‧‧‧電池模組7‧‧‧同心軸叉輪單元71‧‧‧夾臂713‧‧‧弧突部80‧‧‧惰性齒輪81‧‧‧副輪82‧‧‧副輪83‧‧‧副輪
