Method of making a dual-shaft machine

US4974318A · kind A · utility

Assignee

• Leybold GmBH · DE

Inventors

• Josef Heppekausen · Wesseling, DE
• Hans-Peter Kabelitz · Cologne, DE
• Karl-Heinz Ronthaler · Zülpich, DE
• Ralf Steffens · Neunburg vorm Wald, DE

Key dates

• Filing date: Dec 28, 1989
• Grant date: Dec 4, 1990
• Expiry date: Dec 28, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/4984
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A dual-shaft machine comprising a housing, two pistons rotatably mounted in the housing leaving a cold play spacing between one another and said housing, and a coating provided on either the housing or the pistons, or both, to reduce the cold play spacing to that required by the intended field of use of the machine.