| 摘要 |
PROBLEM TO BE SOLVED: To add improvements so that only an actual surface defect is detected by preventing an in accurate measurement result due to a sticking body of dust, etc., on the gear from being generated at a maximum. SOLUTION: A gear 1 to be inspected is supplied in order to a fixture wherein respective gears are fitted freely rotatably although they are individually fixed and engaged with the master gear 2 which is fitted radially in a flexible style and driven in a rotary state; while the two gears are in contact with each other while radially loaded, the gear is driven by the master gear. The radial swing of the master gear in the rotation of the master gear and gear to be inspected is detected and converted into voltage pulses, which are compared with a limit value which can be adjusted from outside as to the continuance and frequency, and the inspected gear is graded corresponding to the inspection result. The master gear has a groove 5 carved and the carved groove 5 removes the majority of the tooth surface area and leaves overlapping and engaging areas corresponding to a peripheral edge area 4.
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