公开(公告)号：US20210180478A1

公开(公告)日：2021-06-17

申请号：US16713633

申请日：2019-12-13

申请人： Caterpillar Inc.

发明人： Jeffrey Clark Krieger ,  Michael Dean Roley

IPC分类号： F01L3/02 ,  F02F1/42 ,  F01L3/20

摘要： An engine head assembly includes a valve seat insert having a valve seating surface defining a center axis, and each of an inner peripheral surface and an outer peripheral surface extending circumferentially around the valve seat center axis. The outer peripheral surface includes an upper section interference-fitted with the engine head, and a lower section. A stiffness relief channel is formed by a relief cutout in the valve seat insert, and extends radially between the lower section of the outer peripheral surface and the engine head. The stiffness relief channel permits flexing of the valve seat insert to cushion valve seating to prolong engine valve and valve seat insert service life.

公开(公告)号：US11215089B2

公开(公告)日：2022-01-04

申请号：US16713633

申请日：2019-12-13

申请人： Caterpillar Inc.

发明人： Jeffrey Clark Krieger ,  Michael Dean Roley

IPC分类号： F01L3/22 ,  F01L3/02 ,  F01L3/20 ,  F02F1/42 ,  F01L3/00

摘要： An engine head assembly includes a valve seat insert having a valve seating surface defining a center axis, and each of an inner peripheral surface and an outer peripheral surface extending circumferentially around the valve seat center axis. The outer peripheral surface includes an upper section interference-fitted with the engine head, and a lower section. A stiffness relief channel is formed by a relief cutout in the valve seat insert, and extends radially between the lower section of the outer peripheral surface and the engine head. The stiffness relief channel permits flexing of the valve seat insert to cushion valve seating to prolong engine valve and valve seat insert service life.

公开(公告)号：US11333048B1

公开(公告)日：2022-05-17

申请号：US17126753

申请日：2020-12-18

申请人： Caterpillar Inc.

发明人： Stephan Donald Roozenboom ,  Jeffrey Clark Krieger ,  Michael Dean Roley

IPC分类号： F01L1/00 ,  F01L9/14 ,  F01L13/06 ,  F01L1/08

摘要： An engine valve actuation system includes a hydro-mechanical valve actuation module having a first hydro-mechanical linkage and a second hydro-mechanical linkage, each within a different housing block of a housing. Each of the first hydro-mechanical linkage and the second hydro-mechanical linkage includes a cam-follower piston in contact with a cam of a camshaft, and a valve-actuation piston hydraulically co-acting with the respective cam-follower piston. The hydro-mechanical valve actuation module may include hydro-mechanical linkages for an intake valve, for an exhaust valve, and for engine braking.