专利检索 ap:("MAN Diesel & Turbo, Filial af MAN Diesel & Turbo SE, Tyskland") AND inv:"Harro Andreas Hoeg" 第 1 页

1.

发明授权
Exhaust valve for an internal combustion engine, and a method of strengthening an annular valve seat area in an exhaust valve 有权

公开(公告)号：US10443456B2

公开(公告)日：2019-10-15

申请号：US16030252

申请日：2018-07-09

申请人： MAN Diesel & Turbo, Filial af MAN Diesel & Turbo SE, Tyskland

发明人： Harro Andreas Hoeg , Christian Skaaning

IPC分类号： F01L3/04 , F01L3/02 , C21D1/18 , C22C19/05 , C22C38/00 , B21K1/22 , B23P15/00

摘要： An exhaust valve for an internal combustion engine comprises a valve disc having a first side (14) and a second side (16), a valve stem extending from the first side of the valve disc, and an annular valve seat area (11) located at the first side of the valve disc. The annular valve seat area (11) is of a nickel-base alloy or a chromium-base alloy and has a valve seat surface. The annular valve seat area has at least a first annular portion (43) located in between two second annular portions (42). The first annular portion has lower hardness than the two second annular portions.