This creation is a kind of deceleration mechanism of related carriage of what,Mainly group sets what vehicle Hou wheel for its deceleration mechanism,What Hou wheel wheel on piece is equipped with an adjusting slider,What adjusting slider is equipped with recessed portion and convex supporting part,And the adjusting slider is displaced by bracing wire gearing is adjusted,The recessed portion that wheel on piece corresponds to adjusting slider again is equipped with damper,And damper is equipped with a damping gear,What Hou wheel wheel shaft corresponds to the ratcheting part of set group one at damping gear again； Thereby,To interlock adjusting slider when adjusting bracing wire,Adjusting slider is allowed to generate slide displacement,Promote convex supporting part pushing tow damper displacement,And sequentially damping gear is driven to engage with the ratcheting part on wheel shaft,And reach the safety effect person of deceleration.本創作係有關於一種四輪車之減速機構，其減速機構主要組設於車輛後輪，於後輪輪片上設有一調節滑塊，於調節滑塊上設有凹陷部及凸抵部，且該調節滑塊受調節拉線連動而位移，再於輪片上對應調節滑塊之凹陷部設有阻尼器，且阻尼器上設有一阻尼齒輪，再於後輪輪軸對應阻尼齒輪處套組一齒合件；藉此，以當調節拉線連動調節滑塊，讓調節滑塊產生滑動位移，促使凸抵部頂推阻尼器位移，且依序帶動阻尼齒輪與輪軸上的齒合件嚙合，而達成減速之安全功效者。
