| 摘要 |
PROBLEM TO BE SOLVED: To provide a spherical bearing device capable of omni-directionally rotating a spherical body quickly and accurately. SOLUTION: The spherical bearing device 10 is composed of six ball bearings 11 arranged on a virtual spherical body R and a retaining base 21 to retain the six ball bearings 11 integrally. Each ball bearing 11 is equipped with a main sphere 12 contacting with the virtual spherical body R and two annular holders 13 to hold the main sphere 12 rotatably. Each annular holder 13 has six sub-spheres 14 arranged annularly and contacting with the main sphere 12 and an annular retainer 15 to retain the six sub-spheres 14 rotatably. The two annular holders 13 are arranged symmetrically about a virtual plane P which perpendicularly intersects with the center line L passing the center C1 of the virtual spherical body R and the center C2 of the main sphere 12 and passes the center C2 of the main sphere 12. The six ball bearings 11 are fixed to six respective recesses 22 formed on the internal circumferential surface 21a of the retaining base 21. COPYRIGHT: (C)2011,JPO&INPIT
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