Patent ID: 8794942

Claim:
A vacuum pump, comprising: a cup-shaped housing; a housing cover to close the cup-shaped housing; a rotor eccentrically mounted for rotation in the housing and having a rotor shaft which traverses the cup-shaped housing and is provided with a bore for conducting a lubricating agent; an external drive to operate the rotor via the rotor shaft; and a connection nipple made of plastic and seated in a free end section of the bore, said free end section of the bore having at least an inner circumferential groove, said connection nipple having a proximal end section which engages in the free end section of the bore and is provided with at least one circumferential bead which engages the inner circumferential groove and rests against a shoulder of the rotor shaft, when the connection nipple is inserted in the free end section of the bore so as to restrain the connection nipple in the bore.