通过调整挂钩，使权力中风，比压缩冲程长，发动机可以达到，但与奥托循环发动机的效率。
By adjusting the linkage to allow a power stroke that is longer than the compression stroke, the engine can achieve greater efficiency than with the Otto cycle engine.
文章介绍了一种挂钩换向链条驱动的长冲程节能抽油机的结构和工作原理。
A new type of energy-saving and long-stroke pumping unit is designed.
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