| 摘要 |
A torque sensor includes first and second shafts, an elastic shaft, a magnet, a pair of ring plates, and a magnetic sensor. The elastic shaft connects the first and second shafts coaxially. The magnet is fixed to the first shaft. The pair of ring plates is fixed to the second shaft, and faces each other in an axial direction of the elastic shaft so that the pair of ring plates sandwiches the magnet. The magnetic sensor is disposed in a gap between the pair of ring plates so that the magnetic sensor detects a magnetic flux density in the gap. Each ring plate includes a convexity and a concavity in an inner circumference of each ring plate, respectively. The pair of ring plates is rotatable against the magnet in accordance with a twist of the elastic shaft so that the rotation of the ring plates causes the magnetic flux density in the gap.
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