Caterpillar Inc.

Christopher Lee Batta

Aaron Ness

Andrew J Loetz

John Robert Brubaker

Shaun David Fogle

Jonathan Kevin Tooker

Dylan S Fawcett

John Ray Gladden

Jonathan P Kilkenny

Thomas W Bowman

Amit Srivastava

James A Subatch, Jr

Zachary T Jacobs

Jonathan Kilkenny

A piston may have 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. In the plane containing the longitudinal axis and the radial direction, the crown portion includes a radially outer squish surface, and a swirl pocket having a reentrant surface that extends axially downwardly and radially outwardly from the squish surface defining a tangent that forms a reentrant angle with the squish surface that ranges from 53.0 degrees to 57.0 degrees.

Low compression natural gas engine piston bowl for improved combustion stability

A piston includes a swirl pocket that extends radially from the radially outer lip portion to a lower axial extremity spaced away from the radially outer lip portion a first axial distance. A convex arcuate surface extends downwardly and inwardly from the radially outer lip portion, a concave arcuate surface extends to the lower axial extremity from the convex arcuate surface, and a conical portion extends upwardly and inwardly from the concave arcuate surface to an apex that is spaced a second axial distance from the radially outer lip portion that is less than the first axial distance.

Piston bowl geometry, cuff and top land interaction for reduced hydrocarbons, improved combustion efficiency, and piston temperature

Systems and methods for forming a plurality of valleys on an inner circumferential surface of a cylinder liner for uniform oil film thickness are disclosed. In one aspect, an internal combustion engine includes a piston; and a cylinder liner surrounding the piston, wherein the cylinder liner has a plurality of valleys on an inner circumferential surface of the cylinder liner, and wherein the plurality of valleys are formed to a frequency of 7 to 14 valleys per millimeter (mm) having a depth of at least 1 micrometer (&#x3bc;m).

Method and system for a cylinder liner

An anti-polishing ring includes a ring body defining an axis of revolution, and a radial direction that is perpendicular to the axis of revolution, and a circumferential direction about the axis of revolution. The ring body includes an outer circumferential surface, a bottom surface, a top surface, and an inner circumferential surface. The inner circumferential surface defines an inner diameter, the ring body defines a radial thickness measured from the inner circumferential surface to the outer circumferential surface, and a ratio of the radial thickness to the inner diameter ranges from 0.015 to 0.020.

A cylinder liner for an engine is disclosed. The cylinder liner may include a cylindrical sleeve with an inner surface and an outer surface extending axially from a first end to a second end. The cylinder liner may also include a void disposed in the first end and concentric to the inner surface of the cylindrical sleeve.

Temperature reducing channel

A cylinder liner associated with an internal combustion engine includes a cooling moat to reduce temperatures at an upper cylinder liner seal. The cooling moat may have a gap extending upwardly toward an inner running surface of the cylinder liner to supply coolant to an upper portion of the cylinder liner. The cooling moat may be provided at a location between the inner running surface of the cylinder liner and a groove for the upper cylinder liner seal.

Cooling moat for upper cylinder liner seal

A cylinder liner is disclosed for use with an engine. The cylinder liner may have a hollow generally cylindrical body with a top end and a bottom end, and a flange extending radially outward at the top end of the hollow generally cylindrical body. The cylinder liner may also have a seal end stop formed on an outer annular surface of the hollow generally cylindrical body an axial distance away from the flange, and an annular groove formed within the outer annular surface of the hollow generally cylindrical body at a location between the end stop and the bottom end.

Cylinder liner having annular coolant circulation groove

A cylinder liner for an engine includes a cylindrical wall having a radially internal surface and a radially external surface opposite the radially internal surface, the cylindrical wall defining a longitudinal axis therethrough, the radially external surface including a sealing surface and an undercut surface adjacent to the sealing surface, the sealing surface at least partly facing away from the longitudinal axis. The undercut surface includes a first surface and a second surface, the first surface at least partly facing the longitudinal axis, and the second surface at least partly facing away from the longitudinal axis.

Cylinder liner with an undercut seal trap

The piston has a crown forming a piston bowl. The piston bowl has a center portion with a convex spherical shape, a floor having a convex frusto-conical shape adjacent the center portion, and a base having a concave toroidal shape surrounding the floor. The piston bowl also has a cylindrical wall extending tangentially from the base that surrounds the center portion. The piston has a top surface perpendicular to the cylindrical wall along a rim of the piston bowl. A ratio between the piston bowl depth and the cylindrical wall length is less than 4, and a ratio between the piston bowl diameter and the piston bowl depth is 4.7.

Growing community of inventors

West Lafayette, IN, United States of America

Christopher Lee Batta