| 摘要 |
PROBLEM TO BE SOLVED: To provide a heating coil that can heat a heated part formed to an inner peripheral surface of a work piece in a circumferential direction with efficiency, and that has a good power transmission efficiency.SOLUTION: A heating coil comprises: a pair of linear lead parts 2 connected to a power supply; and a ring-shaped head part 3 both of whose end parts are connected to these lead parts 2. In the heating coil, a flow channel L for flowing cooling medium therein is formed. The head part 3 has such a circular cross section that an outer peripheral surface thereof is opposed to an orbital plane formed to an inner peripheral surface of an outer ring for wheel rolling bearing in a circumferential direction. Each of the pair of lead parts 2 has a straight line-shaped part 2S arranged close to each other in a plane orthogonal to a longitudinal direction. |
