In some application, a narrow groove is cut into the piston above the top ring 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 piston top dead center, at which the piston ring is positioned.

另外，球塞（6）设置在靠近活塞上死点的活塞环所在的部位。

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Moreover, the ball plungers (6) are positioned near the piston top dead center, at which the piston ring is positioned.

另外，球塞（6）设置在靠近活塞上死点的活塞环所在的部位。

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