US 12,228,092 B2
Cylinder head for a lean-burn gasoline engine
Jack Johnson, Coventry (GB); and Lyn McWilliam, Coventry (GB)
Assigned to JAGUAR LAND ROVER LIMITED, Coventry (GB)
Appl. No. 18/551,620
Filed by JAGUAR LAND ROVER LIMITED, Warwickshire (GB)
PCT Filed Mar. 26, 2021, PCT No. PCT/EP2021/057915
§ 371(c)(1), (2) Date Sep. 21, 2023,
PCT Pub. No. WO2022/199832, PCT Pub. Date Sep. 29, 2022.
Prior Publication US 2024/0175406 A1, May 30, 2024
Int. Cl. F02F 1/42 (2006.01); F02F 1/24 (2006.01)
CPC F02F 1/4235 (2013.01) [F02F 1/4214 (2013.01); F02F 2001/246 (2013.01); F02F 2200/06 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A lean-burn gasoline engine comprising:
an air intake port having an air intake port inlet, an air intake port outlet, and an air channel connecting the air intake port inlet to the air intake port outlet;
a combustion chamber having a combustion chamber inlet being connected to the air intake port outlet, the combustion chamber inlet having a throat where the air intake port outlet meets the combustion chamber inlet;
a movable valve comprising a valve head bottom surface that faces the combustion chamber, a valve head top surface that faces the air intake port and a valve stem, the movable valve being arranged to move between a closed state for closing off the combustion chamber inlet and an opened state wherein intake air can flow from the air intake port into the combustion chamber;
a valve guide opening in a wall of the air channel opposite the top surface of the movable valve; and
a valve guide passage extending into the wall and away from the valve guide opening, the valve guide passage housing a valve guide arranged to guide the valve stem and permit movement of the movable valve between the closed state and an opened state, the valve guide having a first end proximate the movable valve, the first end being positioned within the valve guide passage such that airflow through the air channel is not impeded by the valve guide;
wherein a volume V of free space defined between the opening, the interior walls of the passage, and the valve guide is less than or equal to 1e−6 m3.