Sliding device, fluid dynamic pressure bearing, and motor...

Details Sliding device, fluid dynamic pressure bearing, and motor... Sliding device, fluid dynamic pressure bearing, and motor...

2007-03-27

2007-03-27

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Refractory

C501S087000, C384S100000, C384S114000

Reexamination Certificate

active

11139025

ABSTRACT:
The present invention provides sliding members respectively having sliding surfaces opposed to each other for creating dynamic pressure in a fluid, in which the sliding surfaces are formed of ceramics containing crystal grains of Al2O3, crystal grains of TiC contained in the crystal grains of Al2O3, and crystal grains of TiC existing independently of the crystal grains of Al2O3, and having a TiC content of 5 to 20 mass % in the total amount of Al2O3and TiC, and the respective volume resistivity values R1and R2of the ceramics forming the sliding surfaces are within a range simultaneously satisfying equations (1) to (3) to prevent spark discharges from being induced between the sliding surfaces, and a fluid dynamic pressure bearing and a motor to which the configuration is applied:in-line-formulae description="In-line Formulae" end="lead"?106Ω·cm<R1≦1012Ω·cm  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?106Ω·cm<R2≦1012Ω·cm  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?|R1−R2|≦105Ω·cm  (3)in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 5413850 (1995-05-01), Nehring
patent: 5520716 (1996-05-01), Takagi et al.
patent: 2002/0159659 (2002-10-01), Ishikawa et al.
patent: 63-129061 (1988-01-01), None
patent: 03-075281 (1991-03-01), None
patent: 08-121467 (1996-05-01), None
patent: 08-152020 (1996-06-01), None
patent: 2000329141 (2000-11-01), None
patent: 2002-241172 (2002-08-01), None

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