Patent ID: 9691642
Date: 2017-06-27
CPC Classifications: B05B,B05C,B05D,B08B,B60B,B60T,B61H,F16D,G01B,H01L

Claim:
1. A device for measuring undulation of a brake disc in a railway wheel with brake discs, a pair of brake discs being arranged to face each other across a web of a railway wheel, the brake disc being fastened to the railway wheel by bolts, the device comprising: a wheel support supporting a hub's bore of the railway wheel, and rotating about a central axis of the railway wheel; a first displacement gauge provided to face a frictional surface of one of the brake discs being fastened to the railway wheel by bolts, and measuring a height displacement of the frictional surface for one round to follow rotation of the wheel support; a second displacement gauge provided to face a rim's surface of the railway wheel on a side of the frictional surface, and measuring a height displacement of the rim's surface for one round to follow the rotation of the wheel support; and a computing unit calculating a first difference between a maximum value and a minimum value of the height displacement of the frictional surface by acquiring measurement data from the first displacement gauge, calculating a second difference between a maximum value and a minimum value of the height displacement of the rim's surface by acquiring measurement data from the second displacement gauge, and deriving a difference between the first difference and the second difference as undulation of the brake disc to the rim's surface of the railway wheel.