气弹簧是一种可以省力的可升降弹簧，可分为可自锁气弹簧（如座椅的底部升降，老板椅后靠背等），不可自锁气弹簧（如汽车尾箱、壁橱门的升降支撑），气弹簧的结构主要由套筒、活塞和活塞杆等组成，在套筒内加入高压空气或高压氮气，由于活塞两端面积不等产生压差，推动活塞及活塞杆移动以及支撑人或重物。
气弹簧（gas spring)是一种可以起支撑、缓冲、制动、高度调节及角度调节等功能的工业配件。它由以下几部分构成：压力缸、活塞杆、活塞、密封导向套、填充物（惰性气体或者油气混合物），缸内控制元件与缸外控制元件（指可控气弹簧）和接头等。原理是在密闭的压力缸内充入惰性气体或者油气混合物，使腔体内的压力高于大气压的几倍或者几十倍，利用活塞杆的横截面积小于活塞的横截面积从而产生的压力差来实现活塞杆的运动。由于原理上的根本不同，气弹簧比普通弹簧有着很显著的优点：速度相对缓慢、动态力变化不大（一般在1：1.2以内）、容易控制。
缺点是相对体积没有螺旋弹簧小，成本高、寿命相对短。与机械弹簧不同的是，气弹簧具有近乎线性的弹性曲线。标准气弹簧的弹性系数X介于1.2和1.4之间，其他参数可根据要求及工况灵活定义
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