The utility model relates to the technical field of electric actuating mechanisms, in particular to a straight
stroke driving type electric actuating mechanism which comprises a speed
reducer and a motor, the motor is installed on one side of the speed
reducer, a support is fixedly installed at the bottom end of the speed
reducer, a limiting plate is welded and fixed to the inner side of the support, and the upper end face of the limiting plate is fixedly connected with a stabilizing
assembly. An output shaft is inserted into the stabilizing
assembly and fixedly connected with a fixing ring and a positioning ring in a penetrating mode, the stabilizing
assembly comprises a hollow
pipe, a columnar groove and a strip-shaped groove are formed in the inner side of the hollow
pipe, a holding mechanism is slidably connected into the columnar groove, a compression spring is arranged at the bottom end of the holding mechanism, the holding mechanism comprises a sliding ring, and a ring groove and a mounting groove are formed in the sliding ring. According to the utility model, when the output shaft retracts after extending to the maximum
stroke, multi-stage buffering and dynamic constraint can be carried out on the retraction motion of the output shaft, and radial movement caused by
inertia force is effectively inhibited.