Tire at a non-mounting of the (T), in a state retaining the locking member 18 to the engagement portion (40), moving the at least one of the spindles in the mutually separating direction, the locking member 18 and the locking part ( 40) it was provided a spindle direction engaging means close coupling in the axial direction of the spindle. The second spindle 59 extends in a circumferential direction along its outer periphery and also has a groove 71 for sliding contact with the lock piece 60, the sliding contact surfaces, the amount of the lock member 60 and the groove 71 is a receiving portion (85) formed in the flat in order to receive the separating forces of the spindle. It is provided with a spindle upon rotation of 117, a correction unit for correcting the gap in the outer ring and the rolling elements of the spindle bearing and the rolling elements of the spindle bearing, or the gap of the inner ring of the spindle bearing and the spindle bearing. A coolant passage hollow the corresponding regions passing through the mounting hole 209 of the at least a detector 208 by the preload bolts 202, 219 are installed, the refrigerant can be supplied to the coolant passages 219 It is. ; The locking member, the spindle, the preload bolts, detector, receiving part, the refrigerant passage
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