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Pistons for reciprocating internal combustion engines

A reciprocating, internal combustion engine technology, used in pistons, piston rings, mechanical equipment, etc.

Active Publication Date: 2015-12-09
WAERTSILAE SCHWEIZ AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this leads to the risk of, for example, the piston getting stuck in the cylinder or The piston crown is in contact with the wear ring, which must be avoided at all costs

Method used

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  • Pistons for reciprocating internal combustion engines
  • Pistons for reciprocating internal combustion engines
  • Pistons for reciprocating internal combustion engines

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] exist Figure 1a A first embodiment of an embodiment of a piston 1 according to the invention with spring-loaded guide blocks 8 , 81 is shown in a schematic manner. For better understanding, Figure 1b shown in section along line I-I Figure 1a the piston 1.

[0043] according to Figure 1a or Figure 1b , the piston 1 according to the present invention is a piston 1 for a large two-stroke diesel engine generally having a plurality of cylinders 2 . The piston 1 is shown in a mounted state and is arranged to move back and forth in the axial direction along the axis A of the cylinder between top dead center and bottom dead center in a manner known per se. In this particular embodiment, the piston ring set 3 comprising the two piston rings 31 , 32 is provided at the jacket surface 100 and is arranged between the piston skirt 6 and the piston crown 4 with the top land 5 . The piston skirt 6 forms, as known per se, the lower part of the combustion space surface 7 of the p...

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PUM

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Abstract

The piston has a cylinder (2) arranged along a cylinder axis (A) between an upper dead center and a bottom dead center in an axial direction. A piston ring gasket (3) comprising two piston rings (31, 32) is arranged at a mantle surface (100). The gasket is arranged between a piston crown (4) with a top land (5) and a piston skirt (6). The piston skirt forms a lower portion that is turned away from a combustion chamber surface (7) of the piston. Centering units (8, 81) e.g. guide rings, are provided on the piston for radially centering the piston in the cylinder.

Description

technical field [0001] The present invention relates to pistons for reciprocating internal combustion engines, especially large two-stroke diesel engines. Background technique [0002] Pistons known from the prior art, eg for large diesel engines (but not only for these) are usually equipped with a set of multiple piston rings, which are arranged one above the other in corresponding piston ring grooves middle. Known piston ring sets typically include at least two piston rings, however, typically three, four or even five piston rings, depending on the size and / or power of the engine or on the needs and specificities of the operating engine. operating conditions. In this regard, there is a growing trend to have piston ring sets with as few piston rings as possible. For example, piston ring sets with only two piston rings are advantageously used simultaneously, and in very specific cases the piston may even have substantially only one single piston ring. [0003] Piston rin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02F3/00
CPCF02F3/00F02F5/00
Inventor K·拉斯D·伊姆哈斯里
Owner WAERTSILAE SCHWEIZ AG