Two-shaft vacuum pump

US6863511B2 · kind B2 · utility

Assignee

• LEYBOLD VAKUUM GmbH · DE

Inventors

• Hartmut Kriehn · Neunburg vorm Wald, DE
• Lothar Brenner · Bad Münstereifel, DE
• Manfred Behling
• Thomas Dreifert · Recklinghausen, DE
• Klaus Rofall · Sankt Goarshausen, DE
• Heinrich Engländer · Linnich, DE
• Michael Froitzheim · Dormagen, DE

Key dates

• Filing date: Jul 6, 2001
• Grant date: Mar 8, 2005
• Expiry date: Jul 6, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04C18/16
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A vacuum pump has two shafts (3, 4) and two rotors (1, 2) which co-operate with each other and which are fixed to the shafts. The rotors are cantilevered on the shafts. The rotors are fixed to the shafts in a manner which is devoid of backlash, even during temperature changes. In order to achieve this, the shafts (3, 4) are made of a material having a modulus of elasticity which is as high as possible, e.g., steel. The rotors (1, 2) are made of a material having a density which is as low as possible, e.g., aluminum or a titanium alloy. Structures (8; 11, 12, 13; 14, 15; 25, 27; 38, 41; 43, 44, 45; etc.) are provided to ensure that the rotors (1, 2) are fixed to the shafts (3, 4) in a manner which is devoid of backlash at all operating temperatures.