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Piston ring for two-stroke engines

A two-stroke internal combustion engine, piston ring technology, applied in the direction of piston rings, engine components, machines/engines, etc.

Active Publication Date: 2014-03-05
FEDERAL MOGUL BURSCHEID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0001] Unlike four-stroke engines, two-stroke marine engines have the problem that the oil supply for lubrication and thus wear reduction must be implemented via an oil injection system
No realistically difficult integrated piston-piston ring system to support better oil distribution is known to date

Method used

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  • Piston ring for two-stroke engines
  • Piston ring for two-stroke engines
  • Piston ring for two-stroke engines

Examples

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Embodiment Construction

[0023] figure 1 Shown is a schematic diagram of the principle of the piston-piston ring system according to the invention. Shown in simplified form is a piston 1 , a cylinder 2 surrounding it, which is optionally designed as a cylinder liner. The piston 1 in this example contains a plurality of piston ring grooves 3 , 4 , 5 . Piston rings 6 , 7 , 8 engage in these piston ring grooves 3 , 4 , 5 . Important to the subject of the invention are the piston rings 6 and 8 . The interposed piston ring 7 is optional, so that when looking at the subject matter of the invention only the piston rings 6 and 8 are considered at first.

[0024] The piston rings 6, 8 comprise upper and lower sides 6', 8' and lower sides 6", 8". Each of the two piston rings 6 , 8 has an inner peripheral surface 9 , 10 with a diameter >400 m. The piston-piston ring system according to the invention can be used in two-stroke internal combustion engines, preferably in marine diesel engines. Piston rings 6 ,...

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PUM

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Abstract

The invention relates to a piston ring system for a piston (1) of a two-stroke internal combustion engine, said piston ring system having an internal diameter > 400 mm. The piston ring system has a convex sliding surface, a vertex (15, 16) of the convex section (13, 14), and a supporting region that is in contact with a cylinder wall (2'). The piston ring system consists of a first piston ring (6) and at least one second piston ring (8), said first piston ring being near a combustion chamber and said second piston ring being arranged axially below the first piston ring. The vertex (15) of the convex section (13) of the first piston ring (6), measured from the piston ring lower flank surface (6"), is arranged below the piston ring center, and the vertex (16) of the second piston ring (8), measured from the piston ring lower flank surface (8"), is arranged above the piston ring center.

Description

Background technique [0001] In contrast to four-stroke engines, two-stroke marine engines have the problem that the oil supply for lubrication and thus wear reduction has to be implemented via an oil injection system. These systems must provide enough oil to be used at the right point in time to ensure adequate lubrication of the cylinder surfaces / piston rings. In this respect, it is common in all known systems that the oil supply must be carried out under gas back pressure. As far as the modern marine engine is concerned, it takes about 100min when the stroke is up to 2500mm -1 As far as the rotation speed is concerned, it is difficult to form the time unit oil distribution. In a piston-piston ring system with a diameter of 900 mm and in an oil supply system with, for example, 8 channels distributed over the circumference, separate oil distributions are formed in the circumferential direction by the built-in parts (piston rings) of approximately 350 mm. [0002] This situa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J9/20
CPCF16J9/20F02F5/00
Inventor R·米特勒
Owner FEDERAL MOGUL BURSCHEID