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Cylinder Bore For A Cylinder Housing Of An Internal Combustion Engine, And Arrangement Consisting Of Such A Cylinder Bore And A Piston

A technology for internal combustion engines and cylinder bores, applied in the direction of pistons, cylinders, cylinder heads, etc., can solve problems such as noise generation, and achieve the effects of effectively reducing friction, reducing friction components, and improving friction performance

Inactive Publication Date: 2018-01-26
MAHLE INT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has been shown that, in particular in the case of multi-cylinder engines or engines which are otherwise influenced by external forces during operation, the non-freely movable pistons are exposed to significant lateral accelerations in the region between the upper and lower reentry points, and thus tend to generate noise

Method used

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  • Cylinder Bore For A Cylinder Housing Of An Internal Combustion Engine, And Arrangement Consisting Of Such A Cylinder Bore And A Piston
  • Cylinder Bore For A Cylinder Housing Of An Internal Combustion Engine, And Arrangement Consisting Of Such A Cylinder Bore And A Piston

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Embodiment Construction

[0024] in figure 1 The cylinder bore 10 according to the present invention illustrated in the figure is constructed in the form of a cylinder liner 11. In an exemplary embodiment of a cast iron material with flake graphite, the cylinder liner 11 can be composed of a cast iron material, for example, and can be manufactured by centrifugal casting processing, for example. In the exemplary embodiment, the cylinder liner 11 has a shaft 12 with a circumferential flange 13 and a cylinder running surface 14.

[0025] The piston 20 with the piston ring 21 and the piston skirt 22 is guided up and down in the cylinder liner 11 during engine operation. During engine operation, the piston skirt 22 moves along the cylinder running surface 14 between the upper turning point OS and the lower turning point US, at which the piston 20 reaches a speed close to zero at the upper turning point OS and the lower turning point US v 0 . At the highest load point of the piston skirt 22, the minimum speed...

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Abstract

The invention relates to a cylinder bore (10, 110) with a cylinder running surface (14, 114) for a cylinder housing of an internal combustion engine. An upper reversal point (OS) and a lower reversalpoint (US) are defined in the cylinder bore (10, 110). A piston (20) which is moved up and down in the cylinder bore (10, 110) and has piston rings (21) and a piston shaft (22) reaches a speed (V0) which is almost zero at the reversal points when the motor is being operated, and the piston (20) reaches a maximum speed (Vmax) in a region (15, 115) between the upper reversal point (OS) and the lowerreversal point (US) when the motor is being operated. The invention is characterized in that at least two circumferential depressions (18a, 18b; 118a, 118b, 118c) are formed within the region (15, 115), and the diameter (D2a, D2b, D2c) of the depressions is greater than the diameter (D1) of the cylinder bore (10, 110) above the region (15, 115) and greater than the diameter (D3) below the region(15, 115).

Description

Technical field [0001] The present invention relates to a cylinder bore with a cylinder running surface for a cylinder housing of an internal combustion engine, wherein an upper turning point and a lower turning point are defined in the cylinder bore at which a piston moving up and down in the cylinder bore during engine operation reaches A speed close to zero, and where the piston reaches its maximum speed in the area between the upper and lower reversal points. Background technique [0002] For example, DE102012201342A1 discloses a bore of the type in question. The cylinder running surface of such a bore has locally different roughness structures at different height regions. [0003] DE10360148A1 discloses a bore with a cylinder running surface, in which the top dead center and bottom dead center regions contain microstructures. [0004] Generally, the cylinder running surface should have a defined roughness in order to optimize the lubrication between the cylinder running surfac...

Claims

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Application Information

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IPC IPC(8): F02F1/00F02F3/10
CPCF02F1/004F02F1/18F02F1/20F02F3/0084
Inventor 乌尔里希·比朔夫贝格尔斯特凡·该萨勒曼
Owner MAHLE INT GMBH
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