Dynamic pressure type fluid bearing apparatus

Details Dynamic pressure type fluid bearing apparatus Dynamic pressure type fluid bearing apparatus

1990-11-09

1992-08-25

Hannon, Thomas R.

Bearings

Rotary bearing

Fluid bearing

384100, F16C 3206

Patent

active

051413388

ABSTRACT:
A dynamic pressure type fluid bearing device includes: a shaft; a sleeve into which the shaft is fitted to be rotatable relative to the shaft; two dynamic pressure generating grooves provided on either peripheral surface of the shaft or the inner peripheral surface of the sleeve; and a lubricant held between the shaft and the sleeve. The device has a void, enclosing air, interposed between the two dynamic pressure generating grooves, wherein each of the dynamic pressure generating grooves is not less than four microns in depth and makes an acute angle of less than 20.degree. with a rotational direction of the shaft or the sleeve. The fluid bearing device can include: a sleeve; a shaft fitted into the sleeve, one end surface of which is in contact with a thrust bearing fixed to the sleeve; a dynamic pressure generating groove provided on either the inner peripheral surface of the sleeve or the peripheral surface of the shaft; and a lubricant provided to enclose a space between the shaft and the sleeve as well as the thrust bearing, wherein the dynamic pressure generating groove is not less than four microns in depth and makes an acute angle of less than 17.degree. with a rotational direction of the shaft or the sleeve.

REFERENCES:
patent: 4538929 (1985-09-01), Ehrentraut et al.
patent: 4573807 (1986-03-01), Asada et al.
patent: 4797009 (1989-01-01), Yamazaki
patent: 4798480 (1989-01-01), Van Beek
patent: 4961122 (1990-10-01), Sakai et al.

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