X-ray or gamma ray systems or devices – Source – Electron tube
Patent
1991-09-27
1993-03-16
Church, Craig E.
X-ray or gamma ray systems or devices
Source
Electron tube
378132, H01J 3526
Patent
active
051951193
ABSTRACT:
In a rotary-anode type X-ray tube, a rotary-anode is fixed to a cylindrical rotary structure, and a columnar stationary shaft is fitted in the rotary structure. A gap is formed between the rotary structure and the stationary shaft. The gap is filled with a liquid metal lubricant. Spiral grooves are formed in part of the outer surface of the stationary shaft to form a radial sliding bearing between the stationary shaft and the rotary structure. Spiral grooves are formed in the end faces of the stationary shaft to form a thrust sliding bearing between the stationary shaft and the rotary structure. A recess is formed in the stationary shaft to communicate with gaps in the radial sliding bearing. A lubricant storage chamber for storing the liquid metal lubricant is formed in the stationary shaft along the center axis. The storage chamber communicates with communicating holes which radially extend to be open to an outer surface region, of the stationary shaft, in which no spiral grooves are formed. With this structure, a sufficient amount of liquid metal lubricant required for a long-term operation of the sliding bearings can be stored in the X-ray tube, thereby maintaining a stable dynamic pressure type sliding bearing operation for a long period of time.
REFERENCES:
patent: 3399000 (1968-08-01), Remmers
patent: 3964805 (1976-06-01), Schulien
patent: 4210371 (1980-07-01), Gerkema et al.
patent: 4641332 (1987-02-01), Gerkema
Anno Hidero
Kitami Takayuki
Ono Katsuhiro
Sugiura Hiroyuki
Tazawa Hiroaki
Church Craig E.
Kabushiki Kaisha Toshiba
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