Patent · US Expired

Method of making rotary piston engine cast iron interior seals by quench hardening

US4025366A · kind A · utility

4Cited by

8References

3Claims

0Family size

Assignees

Audi NSU Auto Union Aktiengesellschaft · DE
Wankel GmbH · DE

Inventors

Max Ruf · Obereisesheim, DE
Johannes Steinwart · Löwenstein, DE

Key dates

Filing date	Aug 22, 1975
Grant date	May 24, 1977
Priority date	—
Expiry date	Aug 22, 1995

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF01C19/00
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

An interior seal for rotary piston engines in the form of a cast iron scraper ring is arranged for axial movement in an annular groove in one face of the piston; and an annular scraping edge of the seal slides along the interior surface of the neighboring end wall of the housing.

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