片环 meaning in Chinese

film loop
film ring

Piston rings up to 200 mm diameter for reciprocating internal combustion engines - designs , dimensions and designations for single piece rings - specification for oil control rings
往复式内燃机直径小于等于200mm的活塞环.第7部分:单片环设计尺寸和命名.第4节:控油环规范
Piston rings up to 200 mm diameter for reciprocating internal combustion engines - designs , dimensions and designations for single piece rings - keystone and half keystone compression rings - specification for keystone rings
往复式内燃机直径小于等于200mm的活塞环.第7部分:单片环的设计尺寸和命名.第3节:楔表面和半楔表面压缩环.第1小节:楔表面环的规范
The analysis result shows that the whole system could reach not only a static balance hut also a dynamic balance at all time because of the special phase angle relation , it keeps all the advantages of the traditional cycloidal - pin wheel planetary gear train
分析表明，由于四片环板采用了特殊的相位角关系，整个系统不仅能够达到静力平衡，而且能达到任意时刻的动平衡，同时又保留了摆线针轮行星传动的优点，是一种具有发展前景的传动形式。