Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Spindle motor and rotation device having dynamic pressure bearing










Image Number 3 for United States Patent #7531928.

A spindle motor includes a shaft including a core spindle member with a large and a small diameter portions and an encircling annulus member attached to the small diameter portion; a rotor hub attached to the large diameter portion; a bearing member; a radial bearing portion provided with first dynamic pressure creating grooves and formed between the outer peripheral surface of the encircling annulus member and the inner peripheral surface of the bearing member; a thrust bearing portion provided with second dynamic pressure creating grooves and formed between a lower end of the encircling annulus member and the bottom of the bearing member; a first opening formed at a radially inner side of the thrust bearing portion; a second opening formed at a radially outer side of the large diameter portion; and a communication hole continuously formed from the first opening to the second opening.








 
 
  Recently Added Patents
Video editing method and digital device therefor
Optical transmission module, method for manufacturing optical transmission module, and electronic device
Integration and analog to digital conversion circuit with common capacitors and operating method thereof
Lubricating oil compositions for internal combustion engines
Salt of tetrahydrotriazolopyridine derivative and crystal thereof
Information processing device and method, program, and information processing system
Coating compositions and coatings for medical devices containing PEGylated hyaluronic acid and a PEGylated non-hyaluronic acid polymer
  Randomly Featured Patents
Pipeline or cable plough
Device for receiving and/or transmitting electromagnetic radiation
Method of forming paper products
Boring bar
Cash dispensing automated banking machine and method
Intake device for vehicle engine
Semiconductor power integrated circuit
Extracting shape information contained in cell images
Propeller shield apparatus for trolling motor
Automatic tool changing device and working machine