Patent · US Expired

Composite piston for an internal combustion engine

US7464684B2 · kind B2 · utility

2Cited by

2References

2Claims

0Family size

Assignee

Mahle GmbH · DE

Inventors

Rainer Scharp · Leinfelden, DE
Peter Kemnitz · Leutenbach, DE

Key dates

Filing date	Jun 17, 2005
Grant date	Dec 16, 2008
Priority date	—
Expiry date	Aug 13, 2025

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16B33/02
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

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 (39, 40) is very small and contributes to a high strength of the screw connection.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.