The invention concerns a contact roller bearing for a vacuum pump
comprising a rotor roller bearing ring (12) a coaxial stator roller
bearing ring (13) between which are provided rolling elements (14a, 14b,
14c, 14d) housed in succession and urged to roll on respective raceways of
the rotor (12) and stator (13) roller bearing rings. The rolling elements
comprise an alternating succession of rolling elements (14a, 14c) whereof
the outer surface is made of steel and of rolling elements (14b, 14d)
whereof the outer surface is made of ceramic, thereby reducing the
resistance to acceleration of the contact roller bearing, which limits the
friction and wear of the inner annular surface (16) of the contact roller
and the corresponding bearing of the rotor.