液压滤清器是发动机进气系统、润滑系统和燃烧系统中介质的过滤部件。液压滤清器一般有空气滤清器、机油滤清器、燃油滤清器三种，又称作“三滤”。
空气滤清器位于发动机进气系统中，它是由一个或几个清洁空气的过滤器部件组成的总成。其主要作用是滤除将要进入气缸的空气中有害杂质，以减少气缸、活塞、活塞环、气门及气门座的早期磨损；
机油滤清器位于发动机润滑系统中。其作用是对来自油底壳的机油中有害杂质进行滤除，以洁净的机油供给曲轴、连杆、凸轮轴、增压器、活塞环等运动副，起到润滑、冷却、清洗作用，从而延长这些零部件的；
燃油滤清器有柴油滤清器、汽油滤清器和天然气滤清器三类。其作用是滤除发动机燃油气系统中的有害颗粒和水份，以保护油泵油嘴、缸套、活塞环等，减少磨损，避免堵塞
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