The linear actuators of this creation includes actuating mechanism, stretching structure and quick release mechanism. The outer end of stretching structure is arranged in quick-release configuration, including connecting the adapter of stretching structure, holding seat and brake turbine is fixed in adapter, braking scroll bar is incorporated in and holds seat and optionally brake brake turbine, elasticity presses group elasticity and is pressed against on braking scroll bar, elasticity presses group by external force and corrective action presses power on braking scroll bar, the size for pressing power determines that braking scroll bar and brake turbine compress degree, accordingly, the retraction speed of stretching structure can pass through braking scroll bar and brake turbine compresses degree and adjusts.本創作之線性致動器包括致動機構、伸縮結構及快速釋放機構。快速釋放結構設置在伸縮結構的外端，包括連接伸縮結構的轉接座、承座及制動渦輪套固在轉接座、制動渦桿結合在承座且可選擇性地制動制動渦輪，彈性壓掣組彈性壓抵在制動渦桿上，彈性壓掣組受外力作用而調整作用在制動渦桿上的壓掣力，壓掣力的大小決定制動渦桿及制動渦輪的壓抵程度，據此，伸縮結構的縮回速度可透過制動渦桿及制動渦輪的壓抵程度而調整。
