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Multi-part cooled piston for an internal combustion engine

An internal combustion engine, multi-part technology, applied to pistons, mechanical equipment, engine components, etc., to solve problems such as loose threaded connections, cracks, engine damage, etc.

Inactive Publication Date: 2011-07-06
MAHLE INT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has the disadvantage that, when deformation occurs in the upper area of ​​the lower part of the piston, pressure-induced cracks can appear in the vicinity of the screw hole, causing loosening of the threaded connection and causing damage to the piston and thus to the engine in which it is installed

Method used

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  • Multi-part cooled piston for an internal combustion engine
  • Multi-part cooled piston for an internal combustion engine

Examples

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Embodiment Construction

[0006] The figure shows a multi-part cooled piston 1 consisting of a piston upper part 2 and a piston lower part 6 with a crown pocket 3 and an annular wall 4 with a piston ring 5, which The lower piston part has a box-shaped piston skirt 7 and two pin seats 8 connected thereby, which each have a pin hole 9 for receiving a piston pin (not shown in the figure). The upper piston part 2 and the lower piston part 6 delimit an outer annular cooling channel 10 and an inner annular cooling channel 11 arranged concentrically thereto, wherein the outer cooling channel 10 has at least one oil inlet for introducing cooling oil port 13 and is connected to the internal cooling channel 11 via at least one overflow channel 13 . The overflow channel 13 can be designed as a bore. The inner cooling channel 11 has at least one oil outlet opening 14 through which cooling oil can escape from the inner cooling channel 11 . The upper piston part 2 and the lower piston part 6 can be made of steel. ...

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Abstract

Proposed is a multi-part cooled piston (1) for an internal combustion engine, which piston (1) is composed of an upper piston part (2) and a lower piston part (6). The upper piston part (2) forms an inner annular cooling duct (11) with the lower piston part (6), which cooling duct (11) is covered by an upper region (31) of the lower piston part (6). Said region (31) is of thin-walled design in such a way that it can be deformed in the manner of a plate spring.; Simple and fast assembly of the upper piston part (2) on the lower piston part (6), and a fixed and secure screw connection between the two piston parts, result in that the upper piston part (2) is provided on its underside with a blind bore (26) which is arranged centrally and coaxially with respect to the piston axis (25) and hasan internal thread (28), and in that the upper region (31) of the lower piston part (6) has a threaded bolt (29) which is arranged centrally and coaxially with respect to the piston axis (25), pointsupward and has an external thread (30), with the internal thread (28) matching the external thread (30), such that the upper piston part (2) can be screwed to the lower piston part (6) by means of the blind bore (26) and the threaded bolt.

Description

technical field [0001] The invention relates to a multipart cooled internal combustion engine piston according to the preambles of the claims. Background technique [0002] A multipart cooled internal combustion engine piston is known from laid-open publication DE 102 57 022 A1, which consists of a piston upper part and a piston lower part. Bolts are provided on the underside of the upper piston part, and screw holes are provided in the upper region of the lower piston part, so that the two piston parts can be screwed together via the screws and the screw holes. In this case, the upper area of ​​the lower piston part is designed so thin-walled that it can be deformed like a disk spring when the upper piston part and the lower piston part are screwed together, so that a biasing force is exerted on the screw and the screw hole. , the biasing force stabilizes and secures the threaded connection formed here. However, it has the disadvantage that, when deformations occur in the...

Claims

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Application Information

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