Ball bearing type turbocharger rotor assembly

Details Ball bearing type turbocharger rotor assembly Ball bearing type turbocharger rotor assembly

1989-09-12

1990-07-17

Footland, Lenard A.

Bearings

Rotary bearing

Antifriction bearing

384551, F16C 1904

Patent

active

049417606

ABSTRACT:
A rotor assembly consists of a rotor shaft having a shoulder, turbine wheel, inner ring of a ball bearing and spacer having an end face cooperating with the shoulder to clamp therebetween the inner ring. An aspect of the present invention resides in that a perpendicularity of the end face relative to a center axis of the spacer is equal to or smaller than 0.1% of an inner diameter of the spacer. A clearance is provided between the rotor shaft and the spacer so that the spacer is secured by press fitting to the rotor shaft only at the opposite end portions. Another aspect of the present invention resides in that the rotor assembly is constructed so as to satisfy at least one of the following two factors, i.e., (I) a volume of the clearance is equal to or smaller than 2% of that of an inner space of the spacer and (II) (D2-D1) is equal to or smaller than 2% of D1 where D1 is an outer diameter of the rotor shaft and D2 is an inner diameter of the spacer.

REFERENCES:
patent: 3365256 (1968-01-01), Dardani et al.
patent: 3405982 (1968-10-01), Krenn
patent: 3852858 (1974-12-01), Van Der Horst
patent: 4820060 (1989-04-01), Braune et al.

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