| 摘要 |
PROBLEM TO BE SOLVED: To provide a spindle device which does not damage the compactness thereof, achieves a high speed increasing/decreasing ratio, and exhibits an improved machining ability. SOLUTION: The spindle device has a speed increasing/decreasing mechanism 5 arranged at a location between a spindle 4 with a chuck portion 3 for gripping a tool, on one end thereof, and an input shaft 2 with a shank portion, for increasing/decreasing the rotational speed of the spindle 4 with respect to the rotational speed of the input shaft 2. The speed increasing/decreasing mechanism 5 is of a rocking type, and comprised of a rotary body 12 which is rotatably borne by an inclined portion 10 formed on an outer peripheral surface or an inner peripheral surface of either the input shaft 2 or the spindle 4. The rotary body 12 is formed with a second gear A2 having n2 teeth engageable with a first gear A1 fixed to a spindle main body 1 and having n1 teeth, at an axial end thereof, and is formed with a third gear A3 having n3 teeth engageable with a fourth gear A4 formed on the input shaft or the spindle and having n4 teeth. Thus the rotary body performs rocking motion on the inclined portion and changes engaging locations between the respective gears. COPYRIGHT: (C)2006,JPO&NCIPI
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