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 geomet

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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Example Embodiment

[0013] figure 1 An exemplary internal combustion engine 10 is illustrated. The engine 10 may be a four-stroke diesel engine. However, it is conceivable that the engine 10 may be any other type of internal combustion engine, such as a dual-fuel driven two-stroke or four-stroke engine, a two-stroke diesel, gasoline or gaseous fuel-driven engine, or a four-stroke gasoline engine. The engine 10 may particularly include an engine block 12 that at least partially defines a cylinder 14 and a cylinder bank 16. The cylinder block 16 may include a cylinder liner 18, a piston 20 and a connecting rod 22, and the piston is slidably disposed in the cylinder liner 18. However, it is conceivable that the cylinder group 16 may include a cylinder 14 without a cylinder liner 18, a piston 20 and a connecting rod 22, and the piston is slidably disposed in the cylinder 14. The engine 10 may include a cylinder head 24 that may be connected to the engine block 12 to close the ends of the cylinder 14...

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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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