Patent ID: 11898488
Assignee: CATERPILLAR INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 6:
7. A piston configured to reciprocate in the bore of an engine, the piston comprising:
an annular body including a crown portion defining a longitudinal axis, a radial direction perpendicular to the longitudinal axis, a plane containing the longitudinal axis and the radial direction, and a contoured combustion bowl;
wherein in the plane containing the longitudinal axis and the radial direction
the crown portion includes a radially outer lip portion, and
a swirl pocket that extends radially from the radially outer lip portion and defines a lower axial extremity that is spaced axially away from the radially outer lip portion a first axial distance, and the swirl pocket includes a convex arcuate surface extending axially downwardly and radially inwardly from the radially outer lip portion, a concave arcuate surface extending axially downwardly to the lower axial extremity, and radially inwardly from the convex arcuate surface, a conical portion that extends axially upwardly and radially inwardly from the concave arcuate surface to an apex, the apex being spaced a second axial distance from the radially outer lip portion that is less than the first axial distance, and the radially outer lip portion defines a bowl rim diameter defined by a tangent to the concave arcuate surface in the plane intersecting with a planar squish surface of the radially outer lip portion, the planar squish surface extending planarly and fully circumferentially around the longitudinal axis, and a ratio of the first axial distance to the bowl rim diameter ranges from 0.185 to 0.197.