In some application, a narrow groove is cut into the piston above the topring to serve as a "heat dam" to reduce the amount of heat reaching the top ring.
在一些实际结构中,一条窄槽切入顶端活塞环的上部,其作用是充当“隔热槽”以减少达到顶端活塞环的热量。
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Moreover, the ball plungers (6) are positioned near the pistontop dead center, at which the pistonring is positioned.