好象是你一个人在自问自答，但是你说的应该是压缩环(compression ring)的公式，而油环(oil ring)的公式里，h则是两条油腿的和。
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352 英文名称：ring 中文名称：压缩环 零件号：ar73352 生产或销售：销售维修 系列：6B5.9 ESN：45472615 ref no：19? Group：12.01 Option：CP915
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第一压缩环 top compression ring
第二压缩环 second compression ring
活塞压缩环 gas ring ; piston compression ring
填料箱压缩环 Pressure ring for Stuffing box
第二道压缩环 Second compression ring
第一道压缩环 Top compression ring
刮油压缩环 Scraper Compression Ring
压缩环槽 compression ring groove
内阶梯式压缩环 internally stepped compression ring
安装在环槽中的活塞环有两种类型：压缩环和机油环。
The piston rings carried in the ring groove are of two basic types: compression rings and oil-control ring.
活塞组采用两道压缩环，密封能力强、配气定时准确；
There are two compression rings for the piston group which guarantees good sealing performance and accurate valve timing.
一种具有无螺栓盖的泵，所述盖仅通过其与外壳之间的压缩环就能够被保持在泵的外壳的端部。
A pump has a boltless cover that is held on the end of a housing of the pump by only a compressed ring between the cover and the housing.
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