X-ray or gamma ray systems or devices – Source – Electron tube
Patent
1991-09-27
1993-02-23
Church, Craig E.
X-ray or gamma ray systems or devices
Source
Electron tube
378132, H01J 3526
Patent
active
051896885
ABSTRACT:
A rotary-anode type X-ray tube wherein bubbles produced in the gap of a sliding bearing are securely and easily replaced with liquid metal lubricant, and the metal lubricant is prevented from leaking. The rotary anode is secured to a cylindrical rotary structure. A columnar fixed structure is secured to the rotary structure forming a gap between the rotary structure and fixed structure. A liquid metal lubricant fills the gap. Spiral grooves are formed on a part of the outer surface of the fixed structure and the sliding bearing is installed between the fixed structure and the rotary structure. The rotary structure and fixed structure are housed in a vacuum envelope. The gap of the sliding bearing is connected to the space inside the vacuum envelope through an annular space. A gap is formed between a ring block for blocking the opening of the rotary structure and the fixed structure. A spiral groove to return the metal lubricant to the annular space is formed on the outer surface of the ring block facing the gap, and the annular space is coated with a film repelling the metal lubricant. The annular space and the gap between the ring block and the fixed structure serve to separate from the metal lubricant in the sliding bearing, the bubbles produced therein.
REFERENCES:
patent: 3399000 (1968-08-01), Remmers
patent: 4210371 (1980-07-01), Gerkema et al.
patent: 4614445 (1986-09-01), Gerkema et al.
patent: 4641332 (1987-02-01), Gerkema
Philips Technical Review, vol. 27; pp. 107-108; 1966; G. Remmers, Grease-Lubricated Spiral Groove Bearing for a Straight-Through Shaft.
Anno Hidero
Kitami Takayuki
Ono Katsuhiro
Sugiura Hiroyuki
Tazawa Hiroaki
Church Craig E.
Kabushiki Kaisha Toshiba
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