This creation is used what and creeps the wheels of stair,Two sides of one wheelchair of installing what being tied to form pair,And there is a gear,The tank of the gear sequentially installs an inner tube of a tyre and a cover tire,And the inner tube of a tyre is with one hydraulic device of piping connection what； When the wheelchair what flat road surface is advanced,Hydraulic device expands the inner tube of a tyre,To protrude out the outer rim top surface of gear convex teeth portion against cover tire,Smooth contact is kept with road surface by cover tire,MeanwhileAbsorbed with hydraulic device,Top of buffering wheelchair is winnowed with a dustpan and is shaken,It is uncomfortable when improvement user's operation wheelchair,When wheelchair creeps stair,Hydraulic device shrinks the inner tube of a tyre,Cover tire then can what contact road surface or when stair,Radial displacement is generated in the tank of what gear,Enable the convex teeth portion of gear against the tyre tread of stairway step,The point of application of wheel what step tyre tread is formed,To reach the effect of creeping on wheelchair what stair.本創作之用於爬行樓梯之車輪，係成對的裝設於一輪椅之二側，並且具有一齒輪，該齒輪之容槽依序裝設一內胎及一外胎，而且該內胎以管路連接於一液壓裝置；當該輪椅於平坦路面行進時，液壓裝置使得內胎膨脹，以抵靠外胎凸伸出齒輪凸齒部之外緣頂面，由外胎與路面保持平順的接觸，同時，以液壓裝置吸收、緩衝輪椅之顛簸及震動，改善使用者操作輪椅時之不舒適，當輪椅爬行樓梯時，液壓裝置使得內胎收縮，外胎則可於接觸路面或樓梯時，於齒輪之容槽內產生徑向位移，令齒輪之凸齒部抵靠樓梯台階之踏面，形成車輪於台階踏面之施力點，以達成輪椅於樓梯上爬行之功效。
