Patent application number | Description | Published |
20090293820 | Two-cycle, opposed-piston internal combustion engine - In a two-cycle, opposed-piston internal combustion engine, opposed pistons disposed in a cylinder are coupled to a pair of side-mounted crankshafts by connecting rods that are subject to substantially tensile forces acting between the pistons and the crankshafts. This geometry reduces or eliminates side forces between the pistons and the bore of the cylinder. The cylinder and the pistons are independently cooled to reduce cylindrical deformation caused by thermal expansion during engine operation. | 12-03-2009 |
20100012055 | Cylinder and piston assemblies for opposed piston engines - In an opposed piston engine, a pair of pistons are disposed in opposition in the bore of a cylinder. The cylinder includes first liquid coolant grooves having a first cooling capacity to cool a portion of the cylinder extending from a central portion toward an exhaust port, and second liquid coolant grooves having a second cooling capacity, less than the first cooling capacity, to cool a portion of the cylinder extending from the central portion toward an inlet port. Each piston includes a cylindrical skirt with a crown and an open end opposite the crown, a piston rod with a bore, a first end attached to a back surface of the crown, and a second end extending through the open end of the skirt, a radial array of liquid coolant flow passages in communication with the bore and disposed between the first end and the back surface of the crown, and a single wristpin retained on the second end section of the piston rod and positioned externally to the piston. | 01-21-2010 |
20100212613 | Multi-Cylinder opposed piston engines - Integrated, multi-cylinder opposed engine constructions include a unitary support structure to which cylinder liners are removeably mounted and sealed and on which crankshafts are rotatably supported. The unitary support structure includes cooling manifolds that provide liquid coolant to the cylinder liners. Exhaust and intake manifolds attached to the support structure to serve respective ports in the cylinder liner. The engine constructions may also include certain improvements in the construction of cooled pistons with flexible skirts, and in the construction of cylinders with sealing structures mounted outside of exhaust and inlet ports to control lubricant in the cylindrical interstice between the through bore and the pistons. | 08-26-2010 |
20100212637 | Cylinder and piston assemblies for opposed piston engines - Integrated, multi-cylinder opposed engine constructions include a unitary support structure to which cylinder liners are removeably mounted and sealed and on which crankshafts are rotatably supported. The engine constructions include a cooled piston with a resiliently deformable joint connecting crown and skirt and a cooled cylinder liner with wipers to manage lubricant in the cylindrical interstice between the cylinder bore and the piston skirts. | 08-26-2010 |
20110094223 | Auxiliary systems for opposed piston engines - An opposed piston engine includes at least one cylinder with inlet and exhaust ports and opposed pistons disposed in the cylinder for reciprocating opposed motion toward and away from each other. An auxiliary system pumps liquid coolant separately to the cylinder and pistons. Another auxiliary system controls the flow of intake and exhaust gas in the engine. | 04-28-2011 |
20110271932 | Combustion chamber constructions for opposed-piston engines - A combustion chamber for an opposed-piston engine includes a squish zone defined between circumferential peripheral areas of opposing end surfaces of the pistons, a cavity defined by one or more bowls in the end surfaces, and at least one injection port that extends radially through the squish zone into the cavity. The cavity has a cross-sectional shape that imposes a tumbling motion on air flowing from the squish zone into the cavity. | 11-10-2011 |
20110289916 | EGR constructions for opposed-piston engines - A two-stroke, opposed-piston engine with one or more ported cylinders and uniflow scavenging includes an exhaust gas recirculation (EGR) construction that provides a portion of the exhaust gasses produced by the engine for mixture with charge air to control the production of NOx during combustion. | 12-01-2011 |
20120073541 | Fuel injection spray patterns for opposed-piston engines - A combustion chamber for an opposed-piston engine includes a squish zone defined between circumferential peripheral areas of opposing end surfaces of the pistons, a cavity defined by one or more bowls in the end surfaces, and at least one injection port that extends radially through the squish zone into the cavity. The cavity has a cross-sectional shape that imposes a tumbling motion on air flowing from the squish zone into the cavity. Opposing spray patterns of fuel are injected into the combustion chamber. In some aspects, the opposing spray patterns are injected along a major axis of the combustion chamber. | 03-29-2012 |
20120152185 | Two-cycle, opposed-piston internal combustion engine - In a two-cycle, opposed-piston internal combustion engine, opposed pistons disposed in a cylinder are coupled to a pair of side-mounted crankshafts by connecting rods that are subject to substantially tensile forces acting between the pistons and the crankshafts. This geometry reduces or eliminates side forces between the pistons and the bore of the cylinder. The cylinder and the pistons are independently cooled to reduce cylindrical deformation caused by thermal expansion during engine operation. | 06-21-2012 |
20130112175 | Constructions for Piston Thermal Management - A piston construction with an end surface is equipped with a pattern of insulating cavities embedded in an upper end of the piston, between the end surface and interior portions of the piston that are cooled by circulating liquid coolant. | 05-09-2013 |
20140026563 | EGR Constructions for Opposed-Piston Engines - A two-stroke, opposed-piston engine with one or more ported cylinders and uniflow scavenging includes an exhaust gas recirculation (EGR) construction that provides a portion of the exhaust gasses produced by the engine for mixture with charge air to control the production of NOx during combustion. | 01-30-2014 |
20140026864 | Cylinder and Piston Assemblies for Opposed Piston Engines - Integrated, multi-cylinder opposed engine constructions include a unitary support structure to which cylinder liners are removeably mounted and sealed and on which crankshafts are rotatably supported. The engine constructions include a cooled piston with a resiliently deformable joint connecting crown and skirt and a cooled cylinder liner with wipers to manage lubricant in the cylindrical interstice between the cylinder bore and the piston skirts. | 01-30-2014 |
20140238360 | Rocking Journal Bearings for Two-Stroke Cycle Engines - A rocking journal bearing for a two-stroke cycle engine includes a bearing sleeve having a bearing surface with a plurality of axially-spaced, eccentrically-disposed surface segments and a rocking journal having a plurality of axially-spaced, eccentrically-disposed journal segments. The rocking journal is retained for rocking oscillation on the bearing surface. Space for receiving oil is provided in the rocking journal and oil delivery outlets acting through the journal segments deliver received oil to the bearing surfaces. | 08-28-2014 |
20150013649 | Combustion Chamber Constructions For Opposed-Piston Engines - A combustion chamber for an opposed-piston engine includes a squish zone defined between circumferential peripheral areas of opposing end surfaces of the pistons, a cavity defined by one or more bowls in the end surfaces, and at least one injection port that extends radially through the squish zone into the cavity. The cavity has a cross-sectional shape that imposes a tumbling motion on air flowing from the squish zone into the cavity. | 01-15-2015 |