Rotor shaft

Abstract

The present invention describes a rotor shaft (400) for a vacuum pump, the rotor shaft (400) comprising: a rotor (402) including one or more blades (406) configured to displace gas during rotation, the rotor (402) defining a longitudinal axis (408); and a pair of shaft stubs (404) extending from opposite axial ends of the rotor (402); wherein each shaft stub (404) includes a proximal portion (410) and a distal portion (412), the proximal portion... The part (410) is disposed along the longitudinal axis (408) between the distal portion (412) and the rotor (402); and for each shaft stub (404), the cross-sectional area of ​​the proximal portion (410) of the shaft stub (404) at one interface between the proximal portion (410) and the rotor (402) in a plane perpendicular to the longitudinal axis (408) is greater than the cross-sectional area of ​​a circle having a diameter equal to the minimum diameter of the rotor (402) at that interface. A rotor shaft (400) for a vacuum pump, the rotor shaft (400) comprising: a rotor (402) comprising one or more lobes (406) configured to displace gas when rotated, the rotor (402) defining a longitudinal axis (408); and a pair of shaft stubs (404) extending from opposing axial ends of the rotor (402); wherein each shaft stub (404) comprises a proximal portion (410) and a distal portion (412), the proximal portion (410) being disposed between the distal portion (412) and the rotor (402) along the longitudinal axis (408); and, for each shaft stub (404), a cross-sectional area of the proximal portion (410) of that shaft stub (404) in a plane perpendicular to the longitudinal axis (408) at an interface between the proximal portion (410) and the rotor (402) is greater than that of a circle having a diameter equal to a minimum diameter of the rotor (402) at the interface.

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