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Engine Pistons with Slotted Top Lands

A land and piston technology, applied in engine components, machines/engines, pistons, etc., to solve problems such as increased unburned hydrocarbons and increased NOx levels

Active Publication Date: 2021-04-16
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 Pistons with Slotted Top Lands
  • Engine Pistons with Slotted Top Lands
  • Engine Pistons with Slotted Top Lands

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013]figure 1 Exemplary internal combustion engine 10 illustrates. Engine 10 can be a four-stroke diesel engine. However, it is contemplated that the engine 10 can be any other type of internal combustion engine, such as a two-fuel-driven two stroke or four-stroke engine, two stroke diesel, gasoline or gaseous fuel-driven engines or four stroke gasoline engines. Engine 10 can include, in particular, the engine cylinder 12, which is at least partially defining the cylinder 14 and the cylinder group 16. The cylinder group 16 can include a cylinder block 18, a piston 20, and a connecting rod 22 which is slidably disposed within the cylinder line 18. However, it is conceivable that the cylinder group 16 can include a cylinder 14, a piston 20, and a connecting rod 22 without a cylinder row 18, which is slidably disposed within the cylinder 14. The engine 10 can include a cylinder head 24 that can be coupled to the engine cylinder 12 to close the end of the cylinder 14 and / or the cylin...

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PUM

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Abstract

A piston (20) is disclosed. The piston may have a piston crown (30) with a top surface (48). The piston may also have a first land (50) disposed in the piston crown adjacent to the top surface. The first land may have side surfaces (62) disposed generally normal to the top surface. Furthermore, the piston may have a second land (52) axially spaced from the first land. Furthermore, the piston may have 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 can have a generally concave shape and can extend circumferentially around the top surface.

Description

Technical field[0001]The present invention generally relates to an engine piston, and more particularly to an engine piston having a slotted top tank.Background technique[0002]The internal combustion engine includes one or more combustion chambers, each of which is fitted with a piston, which is attached to the crank axis via the connecting rod. The combustion of the fuel in the combustion chamber causes the piston to move in one direction in the combustion chamber, so that the crank axis is rotated. The rotation of the crank shaft helps drive piston in the opposite direction in the combustion chamber. The piston typically includes a ring groove on its side wall. The groove receives the annular piston ring, which causes the side wall of the piston to spaced apart from the inner wall of the combustion chamber.[0003]During operation of the engine, some of the fuel or fuel air mixtures in the combustion chamber can enter the circumferential gap between the side wall of the piston side ...

Claims

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Application Information

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