Pneumatic journal bearing

Details Pneumatic journal bearing Pneumatic journal bearing

1985-01-23

1986-03-04

Levy, Stuart S.

Bearings

Rotary bearing

Fluid bearing

384278, 384900, 415111, F16C 3206, F16C 3700

Patent

active

045738084

ABSTRACT:
A pneumatic journal bearing suitable for application to a rotating shaft which will acquire high temperature during operation, such as the turbine shaft in an automotive turbocharger. In this journal bearing, the cylindrical hole of the bearing body has a diameter considerably larger than the diameter of the shaft rotating therein. A hollow cylindrical journal member having an inner diameter substantially larger than the diameter of the shaft is coaxially disposed in the bearing hole and coaxially fixed to the shaft at two end plates of the cylindrical journal member, and compressed air is introduced into a clearance space between the journal member and the cylindrical bearing surface. Since the cylindrical major portion of the journal member is spaced from the shaft, the journal member does not undergo such significant thermal expansion as results in significant narrowing of the clearance space even though the shaft acquires high temperature. Preferably, the journal member is formed with some through-holes to admit compressed air into the interior space to thereby cool the shaft.

REFERENCES:
patent: 3058785 (1962-10-01), Steele
patent: 3605441 (1971-09-01), Hagemeister
patent: 4256441 (1981-03-01), Arora

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