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US 12,431,317 B2Granted
Sliding bearing unit and rotary anode type X-RAY tube
AssigneeCanon Electron Tubes & Devices Co., Ltd.
InventorHideki Ide
Life of this patent
Estimating the term…
Abstract
According to one embodiment, a sliding bearing unit includes a stationary shaft including a first radial bearing surface, a rotor, and a lubricant. The rotor includes a first cylinder and a second cylinder. The second cylinder includes a second radial bearing surface and is restricted in operation so that it does not rotate relative to the first cylinder. The lubricant, together with the first radial bearing surface and the second radial bearing surface, forms a dynamic pressure radial sliding bearing.
Claims23
A sliding bearing unit comprising:
- a stationary shaft that extends along a rotation axis and includes a first radial bearing surface on an outer peripheral surface;
- a rotor that is rotatable around the stationary shaft;
- and
- a lubricant,
- wherein
- the rotor includes:
- a first cylinder extending along the rotation axis and located surrounding the stationary shaft, wherein the first cylinder has a tubular shape;
- and
- a second cylinder extending along the rotation axis and located between the stationary shaft and the first cylinder, wherein the second cylinder is formed in a tubular shape, wherein the second cylinder includes a second radial bearing surface on an inner peripheral surface, and wherein the second radial bearing surface is restricted so as not to rotate relative to the first cylinder, and
- the lubricant is filled in a plurality of gaps between the stationary shaft, the first cylinder, and the second cylinder, and the lubricant forms a dynamic pressure radial sliding bearing together with the first radial bearing surface and the second radial bearing surface.
7 more elements
A rotating anode X-ray tube comprising:
- a sliding bearing unit comprising a stationary shaft extending along a rotation axis and including a first radial bearing surface on an outer peripheral surface, a rotor rotatable around the stationary shaft, and a lubricant;
- an anode target;
- a cathode arranged facing the anode target;
- and
- an envelope housing the sliding bearing unit, the anode target, and the cathode, and fixing the stationary shaft,
- wherein
- the rotor includes:
- a first cylinder extending along the rotation axis and located surrounding the stationary shaft, wherein the first cylinder has a tubular shape;
- and
- a second cylinder extending along the rotation axis and located between the stationary shaft and the first cylinder, wherein the second cylinder is formed in a tubular shape, wherein the second cylinder includes a second radial bearing surface on an inner peripheral surface, and wherein the second radial bearing surface is restricted so as not to rotate relative to the first cylinder,
- the lubricant is filled in a plurality of gaps between the stationary shaft, the first cylinder, and the second cylinder, wherein the lubricant forms a dynamic pressure radial sliding bearing together with the first radial bearing surface and the second radial bearing surface, and
- the anode target surrounds an outer peripheral surface of the first cylinder, and is fixed to the first cylinder.
9 more elements
Dependencies are inferred from the claim text.