公开(公告)号：US4993373A

公开(公告)日：1991-02-19

申请号：US480176

申请日：1990-02-14

申请人： Edward D. Klomp ,  Edward G. Groff ,  Donald T. French ,  Paul M. Heck

发明人： Edward D. Klomp ,  Edward G. Groff ,  Donald T. French ,  Paul M. Heck

IPC分类号： F02B25/14 ,  F02D13/02

CPC分类号： F02D13/0284 ,  F01L1/38 ,  F01L7/10 ,  Y02T10/18

摘要： An exhaust port timing valve for a two cycle engine has a sealing shroud preferably made as a flexible sheet that is urged by gas pressure into sealing contact with a slot and/or sealing edges of an associated exhaust port or shroud to allow low friction valve adjustment while limiting gas leakage past the valve unaffected by close tolerances and temperature changes. Springs and/or seals can alternatively be used with flexible or non-flexible shrouds to improve sealing.