Rotating union for supplying compressed air to a rotating part of a printing press

US5110159A · kind A · utility

Assignee

• MAN Roland Druckmaschinen AG · DE

Inventors

• Manfred Herold · Offenbach am Main, DE
• Herbert Rebel · Rodgau, DE

Key dates

• Filing date: Dec 27, 1990
• Grant date: May 5, 1992
• Expiry date: Dec 27, 2010

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16L39/04
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A rotating union for supplying compressed air to the end of a journal of a rotating part of a printing press including a rotor disposed on the rotational axis of the journal and a tubular housing disposed in surrounding relation about the rotor. A plurality of ball bearings each having inner and outer bearing races are disposed between the rotor and tubular housing member for defining a plurality of axially spaced annular air chambers corresponding in number to the air supply lines connected to the tubular housing. Sealing discs are disposed adjacent an axial end of the bearings which in response to communication of pressurized air to the annular air chambers sealingly engage the axial ends of the inner and outer bearing races to effect sealing of the annular air chambers. In pressureless operation, the sealing discs are retained by sealing rings.