| 摘要 |
It is an object of the present invention to provide a wheel shaft supporting apparatus for a grinding machine achieving easy assembling and disassembling of a grinding wheel supported by a pair of wheel shafts and increasing centering accuracy of both wheel shafts and stiffness in combined wheel shaft. A pair of hydrostatic radial bearing devices 42, 43 is mounted on right and left side surface of a front portion of a wheel slide 34 in order to support rotatably wheel shafts 45, 52 respectively. A thrust bearing device 45 mounted in either one of wheel shafts 45, 52 supports the either one wheel shaft 45 or 52 in a thrust direction. A shaft coupling mechanism 60 is installed in wheel shafts 45, 52 in order to assemble and disassemble wheel shafts 45, 52. A taper cylindrical portion 61 is projected from either one of wheel shafts 45, 52 and fitted tightly with a taper inside opening 65 formed in remaining of wheel shafts 45, 52. A vertical end surface 52t, 49t or Fb extending from a base of the taper cylindrical portion 61 is fitted tightly with an another vertical end surface 45t, 52t or 45t of the remaining wheel shaft 45 or 52. Wheel shafts 45, 52 are tightly fitted by two surface fitting of a taper surface fitting and a vertical surface fitting.
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