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Engine piston having a notched top land

A technology of pistons and lands, applied to engine components, machines/engines, pistons, etc., can solve problems such as increased NOx and unburned hydrocarbons

Active Publication Date: 2018-07-06
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, the disclosed piston results in an increase in the amount of NOx
Furthermore, for at least some slotted geometries, the disclosed pistons lead to an undesired increase in the amount of unburned hydrocarbons in the combustion chamber

Method used

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  • Engine piston having a notched top land
  • Engine piston having a notched top land
  • Engine piston having a notched top land

Examples

Experimental program
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Embodiment Construction

[0013] figure 1 An exemplary internal combustion engine 10 is illustrated. Engine 10 may be a four-stroke diesel engine. However, it is contemplated that engine 10 may be any other type of internal combustion engine, such as a dual-fuel powered two-stroke or four-stroke engine, a two-stroke diesel, gasoline or gaseous fuel powered engine, or a four-stroke gasoline engine. Engine 10 may include, among other things, an engine block 12 at least partially defining cylinders 14 and cylinder banks 16 . The cylinder bank 16 may include a cylinder liner 18 , a piston 20 slidably disposed within the cylinder liner 18 , and a connecting rod 22 . However, it is contemplated that cylinder bank 16 may include cylinders 14 without cylinder liners 18 , pistons 20 , which are slidably disposed within cylinders 14 , and connecting rods 22 . The engine 10 may include a cylinder head 24 that may be attached to the engine block 12 to close the ends of the cylinders 14 and / or cylinder liners 18...

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PUM

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Abstract

A piston (20) is disclosed. The piston may have a piston crown (30) having a top surface (48). The piston may also have a first land (50) disposed in the piston crown adjacent the top surface. The first land may have a side surface (62) disposed generally orthogonal to the top surface. Further the piston may have a second land (52) axially separated from the first land. In addition, the piston mayhave a groove (56) disposed between the first land and the second land. The piston may also have a notch (84) extending between the side surface and the top surface. The notch may have a generally concave shape and may extend circumferentially around the top surface.

Description

technical field [0001] The present invention relates generally to engine pistons and, more particularly, to engine pistons having slotted top lands. Background technique [0002] An internal combustion engine comprises one or more combustion chambers, each fitted with a piston connected to a crankshaft via a connecting rod. Combustion of fuel in the combustion chamber causes the piston to move in one direction within the combustion chamber, causing the crankshaft to rotate. Rotation of the crankshaft in turn assists in driving the pistons in opposite directions within the combustion chamber. The piston usually includes an annular groove on its side wall. The grooves receive annular piston rings that space the side walls of the piston from the inner walls of the combustion chamber. [0003] During operation of the engine, some of the fuel or fuel-air mixture in the combustion chamber may enter the circumferential gap between the piston sidewall and the combustion chamber i...

Claims

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Application Information

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IPC IPC(8): F02F3/28F16J1/00
CPCF02F3/28F02F1/004F16C7/023
Inventor A·内斯J·R·布鲁贝克
Owner CATERPILLAR INC
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