Top O piston ring 活塞顶O型圈
top surface of piston ring 活塞环上平面
piston ring top land 活塞端环槽脊
piston top ring groove 活塞顶环槽
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。
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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