Patent · US Expired

Piston for internal combustion engines

US4787295A · kind A · utility

2Cited by

3References

7Claims

0Family size

Assignee

Alcan Deutschland GmbH · DE

Inventors

Karl-Heinz Obermeier-Wagner · Nürnberg, DE
Edgar Martin · Escondido, US
Gerhard Bohm · Stein, DE

Key dates

Filing date	Feb 24, 1988
Grant date	Nov 29, 1988
Priority date	—
Expiry date	Feb 24, 2008

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02F3/00
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

Piston for internal combustion engines, with an oil scraper ring disposed in an annular groove at the circumference of its head portion. The outer edge of the annular groove adjacent to the piston skirt which adjoins the head portion is bevelled to form a chamfer. In order to ensure the maintenance of an oil film sufficient to prevent dry running of the piston, on the cylinder wall, the width of the chamfer is greater on the thrust side of the piston. The width of the chamfer may decrease essentially continuously from the counter-thrust side to the pressure side.

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