DYNAMIC PRESSURE BEARING

• Main Authors: GAN MASAO, TAKAHASHI YUKO, ITO TOYOJI, IWAMURA YOSHIO
• Format: Patent
• Language: English
• Published: 19.09.1995
• Edition: 6
• Subjects: BEARINGS; BLASTING; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINEERING ELEMENTS AND UNITS; FLEXIBLE SHAFTS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SHAFTS; THERMAL INSULATION IN GENERAL; WEAPONS

PURPOSE:To secure smooth starting rotation by forming a recession in each of dynamic pressure generating grooves formed on a fixation surface of a fixed member opposed to a rotational surface of a rotational body, and thereby accumulating minute dusts entering the dynamic pressure generating grooves together with the rotation of the rotational body inside the recession. CONSTITUTION:A rotational body 22 arranged on a center shaft 11 is rotated, strong blowing pressure is generated on a rotational surface 24 formed perpendicularly to the center shaft 11. Stronger blowing pressure is generated in a plurality of dynamic pressure generating grooves 35 formed on a fixation surface 33 opposed to the rotational surface 24 of a fixed member 34. As a result, the rotational surface 24 is floated by a specified distance L in respect to the fixation surface 33. A recession 352 deeper than the dynamic pressure generating groove 35 is formed on a groove end 351 formed in the dynamic pressure generating groove 35 on the side of the center shaft 11. Minute dusts A enter the dynamic pressure generating groove 35 together with rotation of the rotational body 22, and accumulate inside the recession 352. It is thus possible to prevent the rotational surface 24 of the rotational body 22 from being contact with the dusts A and to smoothly start rotation.