Bearings – Rotary bearing – Fluid bearing
Patent
1998-09-02
2000-06-27
Hannon, Thomas R.
Bearings
Rotary bearing
Fluid bearing
384132, F16C 3374
Patent
active
060798793
ABSTRACT:
A hydrodynamic bearing having a liquid accommodating portion in which, even when a liquid in the bearing expands as a result of a temperature rise, it is possible to prevent the liquid from leaking to the outside. In order to attain the object, in a hydrodynamic bearing including: a shaft and a sleeve which relatively rotate; a dynamic pressure bearing portion which is formed between the shaft and the sleeve; and an accommodation portion which accommodates a liquid in the bearing, and which is disposed in a space between the shaft and the sleeve and in the vicinity of an atmosphere side, the accommodation portion is an opposition space portion in which a conical face formed on the shaft and having a diameter that is gradually reduced as moving toward an end portion of the shaft is opposed to a conical face which is formed on an inner side face of the sleeve and which covers the conical face of the shaft.
REFERENCES:
patent: 4445793 (1984-05-01), Shinohara
patent: 5423612 (1995-06-01), Zang et al.
patent: 5722775 (1998-03-01), Thijsse et al.
patent: 5765952 (1998-06-01), Dekker et al.
patent: 5876124 (1999-03-01), Zang et al.
International Search Report, UK Patent Office, Date of Search: Dec. 18, 1998.
Hannon Thomas R.
Koyo Seiko Co. Ltd.
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