PISTON RING WITH TRAPEZOIDAL OPENNINGThe present invention relates to a piston ring with a trapezoidal opening, used for being sleeved on a piston ring groove of a piston and comprising a piston ring main body with an opening, wherein th…DRIVE·Apr 15·1 min readFollowF02F5/00MAHLE AUTOMOTIVE TECH CHINA CO LTD [CN]