| 摘要 |
PURPOSE:To enable noncontact detection without causing performance deterioration due to the adverse influence of rainfall, snowfall, etc., by fitting a temperature sensing magnetic body and a permanent magnet which lose magnetism at specific temperature on the flank of a wheel by shielding magnetism, and providing a temperature sensor where a magnetic sensor is arranged at a spatial distance from the temperature sensing magnetic body. CONSTITUTION:Permanent magnets 5 and 6 are arranged on both sides of the temperature sensing magnetic body 4, and those are put in a magnetic shield 7, whose bottom surface is fixed to the flank of the wheel 1. Then the magnetic sensor 8 is arranged at the spatial distance (l) from the magnetic body 4 without contacting it. Then when a brake shoe 2 is run by being pressed against the wheel 1 at the time of snowfall, etc., the wheel 1 raises up to temperature corresponding to the pressing pressure. The magnetic body 4 becomes a ferromagnetic body or loses its magnetism according to whether or not the temperature is below the curie point of the magnetic body 4, and the output of the magnetic sensor 8 becomes high or low. For the purpose, the curie point of the magnetic body 4 is selected according to the wheel temperature to be measured and the temperature of the wheel 1 can be detected.
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