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Assembled piston for an internal combustion engine

A combined internal combustion engine technology, applied to pistons, mechanical equipment, engine components, etc., can solve problems such as low thread connection strength

Inactive Publication Date: 2007-08-15
MAHLE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because in general, the lead angle of the screw thread is smaller, the strength of the threaded connection is greater, and in the threaded connection known from the prior art mentioned above, the decisive lead angle involved here is equal to two opposite external The sum of thread lead angles, so the strength of this threaded connection is very small

Method used

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  • Assembled piston for an internal combustion engine

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Effect test

Embodiment Construction

[0046] A combined piston 1 is shown in a cross-sectional view, the left half of the cross-sectional view shows a cross-section of the piston 1 along the longitudinal axis 2 of the piston pin seat hole 3, and the right half shows Piston 1 sectional view staggered 90° with the left half. The piston 1 consists of an upper part 4 and a lower part 5, which are connected to each other by means of a hexagon socket head screw 6 arranged in the middle, so that the hexagon socket 42 of the hexagon socket screw 6 is located inside the piston.

[0047] The upper part 4 and the lower part 5 of the piston 1 are preferably manufactured from forged steel. It is also conceivable to manufacture the upper part 4 from steel and the lower part 5 from aluminum, as well as the upper part 4 from forged steel and the lower part 5 from cast aluminum.

[0048] The cylindrical upper part 4 forms a piston crown 7 in which a rotationally symmetrical combustion chamber 8 is formed. The radially outer surf...

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Abstract

The invention relates to an assembled piston (1) for an internal combustion engine, said piston consisting of an upper part (4) and a lower part (5) that are interconnected by means of an internal hexagon screw (6) consisting of an upper half (37) and a lower half (38). The upper half (37) of the internal hexagon screw (6) comprises an external thread (39) which is parallel to the external thread (40) of the lower screw half (38) and has a larger lead angle than the same (40). The lead angle resulting from the difference between the lead angles of the two external threads is very small and contributes to a high strength of the screw connection.

Description

technical field [0001] The invention relates to a combined piston for an internal combustion engine according to the preamble of claim 1 . Background technique [0002] A combined piston is known from DE 22 12 922, which consists of an upper part and a lower part. The two piston parts are connected to each other by means of a hexagon socket head screw, which consists of a screw head and a screw shank, the screw head having an external thread opposite to the screw shank. Because in general, the lead angle of the screw thread is smaller, the strength of the threaded connection is greater, and in the threaded connection known from the prior art mentioned above, the decisive lead angle involved here is equal to two opposite external The sum of thread lead angles, so the strength of this threaded connection is very small. Contents of the invention [0003] The object of the present invention is to avoid the disadvantages of the prior art, that is to say, to provide a long-ter...

Claims

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Application Information

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IPC IPC(8): F02F3/00F16B5/02F16B33/02
CPCF02F3/0023F16B5/0275F16B33/02F02F3/00F16B5/02
Inventor 赖纳·沙普彼得·克姆尼茨
Owner MAHLE GMBH
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