US 12,338,752 B2
Two-step cam controlled exhaust valve deactivation to operate a divided exhaust boost system
Xin Yu, New Hudson, MI (US); and Andrew Baur, Whitmore Lake, MI (US)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Nov. 28, 2022, as Appl. No. 18/059,178.
Prior Publication US 2024/0175380 A1, May 30, 2024
Int. Cl. F01L 1/34 (2006.01); F01L 1/053 (2006.01); F01L 1/344 (2006.01); F02D 13/02 (2006.01)
CPC F01L 1/3442 (2013.01) [F01L 1/053 (2013.01); F01L 2001/0537 (2013.01); F01L 2001/34426 (2013.01); F01L 2201/00 (2013.01); F01L 2800/06 (2013.01); F02D 13/0257 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An exhaust system comprising:
a plurality of cylinders;
each cylinder comprising a scavenge exhaust valve and a blowdown exhaust valve;
an arrangement that activates and deactivates the scavenge exhaust valves and the blowdown exhaust valves, the arrangement comprising:
a first oil gallery that feeds oil to each of the scavenge exhaust valves; and
a second oil gallery, separate from the first oil gallery, that feeds oil to each of the blowdown exhaust valves;
a scavenge path leading from the scavenge exhaust valves;
a blowdown path leading from the blowdown exhaust valves; and
a cam shaft including a plurality of scavenge cams and a plurality of blowdown cams;
wherein, during rotation of the cam shaft:
the scavenge cams interact with the scavenge exhaust valves to open and close the scavenge exhaust valves when the scavenge exhaust valves are activated; and
the blowdown cams interact with the blowdown exhaust valves to open and close the blowdown exhaust valves when the blowdown exhaust valves are activated, and at different times with respect to the opening and closing of the scavenge exhaust valves;
wherein, when viewed along an axial direction with respect to the cam shaft, the scavenge cams each include a first off lobe, an on lobe and a second off lobe, wherein the on lobe is axially offset from the first and second off lobes; and
the scavenge exhaust valves each include a movable component,
wherein the on lobe includes a cam profile to engage with the movable component to periodically move the movable component and open and close the scavenge exhaust valve, and
wherein the first and second off lobes each include no cam profile configured to effect movement of the movable component.