Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Fluid dynamic bearing device










Image Number 5 for United States Patent #8113715.

In this type of fluid dynamic bearing device, a dynamic pressure generating part having high molding accuracy is formed at low cost. A rotating member 2 includes a shaft part 9, and a holding member 10 as a thrust member provided in one end of the shaft part 9. In a partial annular region of a lower end surface 10a1 of a disk part 10a making up the holding member 10, a region where a plurality of dynamic pressure grooves 10a2 and a plurality of sectioning parts 10a3 formed between the plurality of dynamic pressure grooves 10a2 to section the respective dynamic pressure grooves 10a2 are arrayed spirally is formed. The above-described dynamic-pressure-groove 10a2 arrayed region is opposed to an upper end surface 8a of a housing part 8, and forms a thrust bearing clearance of a thrust bearing part T between the dynamic-pressure-groove 10a2 and the upper end surface 8a during the rotation of the shaft part 9. The above-described dynamic-pressure-groove 10a2 arrayed region is molded in the lower end surface 10a1 of the holding member 10 by press working.








 
 
  Recently Added Patents
Light-emitting diode package and method for manufacturing the same
Interferer region identification using image processing
Nonvolatile semiconductor memory device and method for manufacturing the same
Methods, systems, and products for providing communications services
Active pellet without chemical additives
Apparatus and method for information processing, program, and recording medium
Portable stand for computer
  Randomly Featured Patents
Black iron-based composite particles, process for producing the same, paint and rubber or resin composition containing the same
Pyrazole derivative as SCD1 inhibitors for the treatment of diabetes
Heat exchanger element comprising a single and integrally extruded member including at least two hollow tubes integrally joined by at least two webs
Drilling fluid concentrates
Recording medium conveying device including a pair of circular coaxial gears
Method and apparatus for dicing die attach film on a semiconductor wafer
Transfer method, method for manufacturing semiconductor device, and semiconductor device
Mordenite-based catalyst containing at least one metal from group VIII and its use for isomerizing a C.sub.8 aromatic fraction
Method of making an interior trim panel
Method for determining reference phase in radio communication system which uses orthogonal M-ary modulation, and coherent detection method using the same