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Two-piece piston for an internal combustion engine

An internal combustion engine, two-stage technology, applied in the direction of piston, cylindrical piston, plunger, etc., can solve problems such as reducing the compression height of the piston

Inactive Publication Date: 2010-08-11
MAHLE INT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage here is that the space taken by the bolt reduces the compression height of the piston

Method used

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  • Two-piece piston for an internal combustion engine
  • Two-piece piston for an internal combustion engine
  • Two-piece piston for an internal combustion engine

Examples

Experimental program
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Effect test

Embodiment Construction

[0016] FIG. 1 depicts a cooled two-section piston consisting of an upper part 2 and a lower part 3 . The upper part 2 and the lower part 3 can be made of steel or other metallic material. The piston crown 4 delimits the upper axial side of the upper part 2 , which radially inside has a combustion chamber. Formed on the outer edge of the piston top 4 is an annular wall 6, the outer surface of which forms a fire land 7 on the top side of the piston, and this fire land adjoins a piston ring part 8 with ring grooves on the piston skirt side, these The ring groove is used to receive a piston ring not shown in the figure.

[0017] On the underside of the lower part 3 facing away from the piston crown 4 are provided two piston pin seats 9, 9' each with a piston pin hole 10, 10', the end faces 11 of which are opposite to each other The ring wall 6 is retracted inwardly in the direction of the piston axis 12 . The two piston pin seats 9, 9' are connected to one another via piston sk...

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PUM

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Abstract

A two-piece piston 1 for an internal combustion engine is proposed, having a top part 2 which has a bolt 31 with an external thread 32 on the underside of its piston crown 4, and having a bottom part 3 which is connected to the top part 2 by means of a nut 29 screwed onto the bolt 31. The bottom part 3 has an elastically resilient, top base part 25, on which an expansion sleeve 26 which is elastic in the axial direction is integrally formed radially on the inside, said expansion sleeve 26 having an opening 27 with a collar 28 directed radially inwards, into which opening 27 the bolt 31 is inserted. Integrally formed on the nut 29 is an elastic compression sleeve 30 which bears against the collar 28.; In this case, the elastic resilience of the base part 25, of the expansion sleeve 26, of the compression sleeve 30, of the bolt 31 and of the piston crown 4 results in the screwed connection having a flat characteristic desipite a small compression height of the piston 1, said characteristic giving the screwed connection high strength.

Description

technical field [0001] The invention relates to a two-stage internal combustion engine piston with an upper part forming the piston crown, on the lower side of the upper part opposite to the piston crown there is an externally threaded shaft coaxial with the piston axis. Cylindrical bolt with a lower part on the underside of which is provided with a piston pin seat with a piston pin hole and a piston skirt element connecting the piston pin seat to each other, wherein the lower part has a The piston axis is coaxial with the opening into which said cylindrical bolt is inserted, and wherein the upper and lower parts are connected to each other by means of nuts screwed onto the external thread of said cylindrical bolt. Background technique [0002] European Patent Application No. 0 604 223 A1 discloses a piston consisting of an upper part and a lower part, wherein a bolt with an external thread is provided on the lower side of the upper part facing away from the piston crown, by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02F3/00
CPCF02F3/0023F02F3/22F02F3/00F16J1/16F16J1/00
Inventor 赖纳·沙普
Owner MAHLE INT GMBH