... piston ring guard 活塞环防护器 piston ring joint 活塞环接口 piston ring lock 活塞环止转销钉 ...
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汽车发动机上的活塞环通常是有接口的。但在一些重型发动机上，活塞环的接口可以是斜角接口，搭接式或密封式的。
Rings for automotive engine usually have butt joints, but in some heavy-duty engines, the joints may be angled, lapped, or of the sealed type.
活塞环有接口（也就是有一缝隙），这样可以使端部扩张并滑入活塞上的凹槽中。
The rings have joints (they are split) so that they can be expanded and slipped over the piston head and into the recessed grooves cut in the piston.
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