Patent · US Expired

Rotary piston machine having inner and outer rotors and a reinforcing belt

US4795326A · kind A · utility

0Cited by

4References

7Claims

0Family size

Assignee

PIERBURG GMBH · DE

Inventors

Hans Baumgartner · Viersen, DE
Klaus Heikrodt · Krefeld, DE
Werner Seifert · Bargteheide, DE

Key dates

Filing date	Jan 15, 1988
Grant date	Jan 3, 1989
Priority date	—
Expiry date	Jan 15, 2008

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF01C21/104
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A rotary piston machine has inner and outer rotors rotating at unequal speeds around eccentric axes, and the rotors are provided with angularly spaced profiled teeth and gaps which cooperate during rotation to define working chambers of varying volume which move between an inlet and an outlet for a fluid medium to be pumped. The outer rotor has openings therein to provide communication between the working chambers and the inlet and outlet during rotation of the rotors, and these openings are spaced axially of the outer rotor to define a solid band of material between the openings. The solid band of material is provided with a circumferential groove in which a reinforcing belt is mounted having greater strength than the material of the outer rotor. The belt can be glass, carbon or aramide fiber would as threads and impregnated with a hardened plastic such as an epoxy resin.

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