Patent · US Expired

Multipiece piston

US6622613B1 · kind B1 · utility

8Cited by

4References

9Claims

0Family size

Assignee

Mahle GmbH · DE

Inventors

Jochen Kortas · Murr, DE
Stefan Lipp · Bad Liebenzell, DE
Wilfried Sander · Neckarsulm, DE

Key dates

Filing date	Sep 6, 2001
Grant date	Sep 23, 2003
Priority date	—
Expiry date	Sep 6, 2021

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF05C2201/0448
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A multipiece piston comprises a steel upper part and a lower part which is screwed to the upper part and which contains the hubs. The design of the piston improves the strength of the lower part and its resistance to material defects, and reduces production cost. The lower part of the piston consists of a precipitation-hardened ferrite-pearlite steel, preferably according to EN 10267 and with added titanium. The hubs of the lower part are preferably not reinforced with bushings.

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