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Engine block for an internal combustion engine of a motor vehicle, and method for producing an engine block for an internal combustion engine of a motor vehicle

A technology of engine body and internal combustion engine, which is applied in the direction of machines/engines, engine components, cylinders, etc., and can solve the problems of increased frictional power consumption and consumption

Active Publication Date: 2019-06-25
MERCEDES BENZ GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the structure of such crankcases, the degree of tightening required for the cylinder head screws, the different thermal expansions during operation after ignition and the cylinder pressures generated during the combustion process, there are sometimes large deviations from the ideal cylindrical shape, This will cause frictional power dissipation and increase consumption

Method used

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  • Engine block for an internal combustion engine of a motor vehicle, and method for producing an engine block for an internal combustion engine of a motor vehicle
  • Engine block for an internal combustion engine of a motor vehicle, and method for producing an engine block for an internal combustion engine of a motor vehicle

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Embodiment Construction

[0019] figure 1 It is a side sectional view of two different cylinders 10 , 12 which are each part of an internal combustion engine not shown in detail. figure 1 The pistons 14 in are arranged in the top dead center OT. Cylinders 10, 12 are all in a state of warming that is reached after a period of time during the operation of the internal combustion engine after ignition. That is, the shape of the illustrated cylinders 10 , 12 corresponds to the shape that the cylinders 10 , 12 have when the internal combustion engine reaches normal operating temperatures during operation.

[0020] The two cylinders 10 , 12 differ with regard to the geometry of the cylinder running surfaces 16 , 18 . In the illustrated elevated state, the diameter D of the cylinder running surface 16 of the left cylinder 10 decreases towards the bottom dead center UT of the piston 14 . That is to say that the cylinder running surface 16 tapers downwards in this figure. And in the cooling state, that is, ...

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Abstract

The invention relates to an engine block for an internal combustion engine of a motor vehicle, having at least one cylinder (12), inside which a piston (14) can be accommodated movably between a top dead centre (OT) and a bottom dead centre (UT), and a cylinder running surface (18), the inner cylinder diameter (D) of which widens towards the bottom dead centre (UT). The inner cylinder diameter (D)does not widen until below the region (X) in which a change in piston position takes place during operation of the internal combustion engine, the inner cylinder diameter (D) tapering from the top dead centre (OT) to the region (X). The invention also relates to a method for producing an engine block for an internal combustion engine of a motor vehicle having at least one cylinder (12).

Description

technical field [0001] The invention relates to an engine block for a motor vehicle internal combustion engine and to a method for producing an engine block for a motor vehicle internal combustion engine of the type stated in the preambles of the independent claims. Background technique [0002] Cylinders in engine blocks for internal combustion engines generally have a cylindrical shape in the finished state. Such engine blocks are also commonly referred to as crankcases. However, due to the structure of such crankcases, the required tightening of the cylinder head screws, the different thermal expansions during operation after ignition and the cylinder pressures generated during the combustion process, there are sometimes large deviations from the ideal cylindrical shape, This will cause frictional power dissipation and increase consumption. [0003] In known solutions, deviations from a strictly cylindrical shape are made when manufacturing cylinders for use in engine b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02F1/18
CPCF02F1/18F02F3/00F02F2200/00F16J10/00
Inventor T·贝尔K·盖格尔U·格里默尔T·汉施克M·哈特维格V·拉格曼H·沙伊布S·席费尔M·施特尔S·托马斯琴科
Owner MERCEDES BENZ GRP
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