Resources Contact Us Home
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
Phase noise extraction apparatus and technique
Compositions substantially free of sodium chloride and methods for the storage of red blood cells
Sensor chip, sensor cartridge, and analysis apparatus
Transcoded images for improved trick play
Method for designing sunlight-reflection and heat-radiation multilayer film
Intake parameter-calculating device for internal combustion engine and method of calculating intake parameter
Crowd validated internet document witnessing system
  Randomly Featured Patents
Massager to be inserted in the back of a massage chair or the like, provided with massage pressure adjustment
Method and apparatus for spinning a synthetic multi-filament yarn
Cell loss rate sensitive routing and call admission control method
Reloadable stun grenade
Method for controlling the viscosity of dispersed clay slurries
Pulsed direct current power supply configurations for generating plasmas
System and method for communication between a controller and a power supply using a communication interface
Integrated circuit memory devices having asynchronous flow-through capability
Removal of color from paper mill waste waters
Method and apparatus for capturing facial expressions