Impeller mounting for electrically driven air pump to reduce vibration

US5797727A · kind A · utility

Assignee

• PIERBURG GMBH · DE

Inventors

• Rainer Peters · Goch, DE
• Michael Bonse · Düsseldorf, DE
• Gunter van de Venne · Wittlich, DE

Key dates

• Filing date: Mar 21, 1997
• Grant date: Aug 25, 1998
• Expiry date: Mar 21, 2017

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F05D2300/43
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An electrically driven air pump having a housing containing a pump unit driven from a shaft of an electric motor, the pump unit including two impellers made of plastic having hubs which are press-fit on the shaft of the electric motor. A collar is also press-fit on the shaft and abutting against the hub of one impeller on a side thereof facing the electric motor, and a lock ring made of metal is press-fit on the shaft and abuts against the hub of the other impeller on a side thereof facing away from the electric motor thereby to clamp the impellers between the collar and the lock ring. The lock ring and the hub of the adjoining impeller are formed at their mutually abutting surfaces with a tooth and groove arrangement to prevent relative rotary movement therebetween. A similar tooth and groove arrangement can be provided between the abutting surfaces of the impellers and between the abutting surfaces of the collar and the adjoining impeller.