“O型圈”(O-rings)是一种截面为圆形的橡胶密封圈，因其截面为O型，
故称其为O型橡胶密封圈，也叫O型圈。开始出现在19世纪中叶，当时
用它作蒸汽机汽缸的密封元件。
因为价格便宜，制造简单，功能可靠，并且安装要求简单，O型环是
Zui常见的密封用机械设计。O型环承受几十兆帕斯卡（千磅）的压力
。O型环可用于静态的应用中，也可以用在部件之间有相对运动的动
态应用中，例如旋转泵的轴和液压缸活塞。
“O-rings”(O-rings) is a circular section of the rubber ring,because its section of O-type, it is called O-type rubber ring,also known as o-ring. It first appeared in the mid-19th century asa sealing element for steam engine cylinders.
The o-ring is the most common mechanical design for seals becauseof its low cost, simple fabrication, reliable function, and simpleinstallation requirements. The o-ring withstands tens ofmegabascals (thousands of pounds) of pressure. The o-ring can beused in static applications as well as in dynamic applicationswhere there is relative motion between components, such as theshaft of a rotary pump and the piston of a hydrauliccylinder.
