Vacuum pump

摘要

A pump insert (50) for supporting a rotor (14) of a pump comprises an annular resilient support (52) for engaging the body (26) of the pump, the support (52) extending about a rolling bearing (10) having an inner race (12) for engaging the rotor (14), an axially preloaded outer race (16) fixed to the support (52), and a plurality of rolling elements (18) located between the races. During assembly, the rolling bearing (10) can be accurately positioned within the support (52) so that there is a very low tolerance stack-up when the insert (50) is fitted to the rotor (14). Consequently, the position of the rotor (14) will hardly change, if at all, when the rolling bearing (10) is replaced during servicing of the pump.

主权项

1. A method of assembling a pump insert, the method comprising the steps of:
locating an annular resilient support about a rolling bearing having an inner race, an outer race and a plurality of rolling elements located between the races; positioning the bearing at a desired location within the support relative to an axial end surface of the support; and at this location, fixing the support to the outer race of the bearing whilst applying a preload to the outer race of the bearing before inserting the pump insert in a pump.