SMC無桿氣缸是指利用活塞直接或間接方式連接外界執(zhí)行機械，并使其跟隨活塞實現(xiàn)往復運動的氣缸。這種氣缸的zui大優(yōu)點是節(jié)省安裝空間。
SMC無桿氣缸一般可分為磁耦合式SMC無桿氣缸和機械接觸式SMC無桿氣缸。
CY1系列氣缸是磁耦合式SMC無桿氣缸，磁耦SMC無桿氣缸原理是：在活塞上安裝一組高強磁性的磁環(huán)，當活塞在缸筒內被氣壓推動時，在磁力作用下，活塞內的磁環(huán)帶動活塞外的磁環(huán)運動。
機械式SMC無桿氣缸原理為：氣缸管軸向開有一條槽，活塞與滑塊可在槽上移動，活塞架把活塞與滑塊連接成一體，當活塞運動時帶動固定在滑塊上的執(zhí)行機構實現(xiàn)往復運動。
 磁耦合式SMC無桿氣缸與機械SMC無桿氣缸相比更有優(yōu)勢：
（1）磁耦合式SMC無桿氣缸外形較小，且兩頭帶有安裝螺紋與螺母，可以直接安裝在設備上；
（2）磁耦合式SMC無桿氣缸無外部寫離譜，安裝使用后可免維護。

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