Piston upper part with enlarged cooling chamber for assembled or welded pistons

A technology for pistons and piston tops, applied in pistons, manufacturing tools, casting and molding equipment, etc., can solve the problems of loss of strength and shape stability of piston materials, thermal aging, etc., to reduce the risk of lubricant coking, improve cooling, The effect of high structural strength

Active Publication Date: 2019-05-14
KOLBENSCHMIDT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such internal combustion engines can be operated at temperatures exceeding the permissible limits of the piston material and therefore risk thermal aging, during which the strength and shape stability of the piston material alloy is lost

Method used

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  • Piston upper part with enlarged cooling chamber for assembled or welded pistons
  • Piston upper part with enlarged cooling chamber for assembled or welded pistons
  • Piston upper part with enlarged cooling chamber for assembled or welded pistons

Examples

Experimental program
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Effect test

Embodiment Construction

[0033] figure 1 A longitudinal section through a piston upper part 1 is shown, which is, for example, a steel alloy component produced by means of a forging process. As an alternative, the piston upper part 1 can also be made of aluminium, an aluminum alloy or an iron alloy. Alternatively, the piston upper part 1 can also be produced by any other forming or forming process. piston upper 1 and figure 1 The lower part of the piston, not shown in , together forms a two-part piston that is assembled in a friction fit or welded in a material fit, which is cooled by a liquid. Via two circumferential joint webs 2 , 3 offset radially from one another, the piston upper part 1 is supported on corresponding joint webs of the piston lower part. All joining webs together form a separating plane 4 via which the lower piston part and the upper piston part 1 are permanently connected to each other by means of a frictional fit, preferably a screw connection or a material fit, preferably a w...

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PUM

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Abstract

A liquid cooled piston of an internal combustion engine includes a piston lower part and piston upper part which has a combustion chamber recess. These piston components are supported via joining lands which are spaced apart radially and together form a dividing plane, and are joined together with a material-to-material fit. In order to receive piston rings, the piston upper part has a ring area and includes an annular cooling channel which extends into the piston lower part and is connected to an inner cooling space via connecting channels. The cooling channel is adjoined by recesses which are oriented in the direction of a piston head, are configured as a blind hole and widen conically starting from the cooling channel as far as a recess bottom. The recess bottom can be of a pronounced undulating enlarged surface or a finely undulating configuration.

Description

technical field [0001] The invention relates to a one-piece and two-piece internal combustion engine piston and a method for producing such a piston. Background technique [0002] In order to comply with emission limit values ​​or to achieve emission targets and fuel consumption targets, it is necessary to increase the combustion temperature and combustion pressure for optimum combustion, whereby especially the upper part of the piston is exposed to high thermal loads. The operating temperature of such an internal combustion engine can exceed the permissible limits of the piston material, so there is a risk of thermal aging in which the strength and dimensional stability of the piston material alloy are lost. In order to minimize the thermal load on the piston, pistons are used in which an annular cooling channel is integrated into which a portion of the internal combustion engine lubricating oil is sprayed as coolant via injection nozzles, flows through the cooling channel ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02F3/00F02F3/22
CPCB22C9/105F02F3/003F02F3/22F02F3/225Y10T29/49231Y10T29/49249Y10T29/49252Y10T29/49256F02F3/02F02F3/16
Inventor A·奥尔马
Owner KOLBENSCHMIDT AG
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