The present invention relates to a high-load linear actuator, including a driving mechanism, a worm shaft, a worm wheel assembly, a lead screw, a telescopic pipe and an outer pipe. The driving mechanism includes a base and a motor. The base has a supporting base and an accommodating portion. The motor is fixed to the supporting portion. The worm shaft extends from the motor into the supporting portion. The worm wheel assembly comprises a worm wheel and two bearings for supporting the worm wheel in the accommodating portion. The worm wheel is drivingly engaged with the worm shaft. The lead screw is disposed through the worm wheel and driven by the motor for rotation. The telescopic pipe slips on the lead screw to be threadedly connected therewith. The outer pipe slips on the telescopic pipe. The rotation of the lead screw drives the telescopic pipe to linearly extend or retract relative to the outer pipe. By this structure, the present invention can be used in a medical apparatus capable of supporting a heavy load stably.本發明係關於一種高載重線性致動器,包括驅動機構、蝸桿、蝸輪組件、導螺桿、伸縮管及外管,驅動機構包含機座及電動機,機座具有承接部和安置部,電動機固定在支承部;蝸桿自電動機延伸且穿入承接部中;蝸輪組件包含蝸輪及共同將蝸輪支承於安置部的二軸承,蝸輪與蝸桿相互囓合傳動;導螺桿穿接蝸輪並受電動機的致動而產生旋轉;伸縮管套設在導螺桿外部並與其相互螺接;外管套接在伸縮管外部,伸縮管受導螺桿的旋轉驅動而相對外管產生線性伸縮移動。藉此,形成穩固的支承作用而能夠應用於高載重的醫療設備上。
