Heating coil and quenching device

A heating coil used for induction heating of a roller guide groove formed on an inner peripheral surface of an outer ring of a tripod type constant velocity joint, comprising:

• a coil body inserted into the outer ring through an opening on one end side of the outer ring;
• and
• a plurality of shield members disposed to face an inner peripheral surface of an opening side end of the outer ring, wherein
• the coil body includes
• three heaters that are disposed at intervals in a circumferential direction around a central axis and each housed in the roller guide groove, and
• three connectors that are interposed between the two heaters adjacent to each other in the circumferential direction and project from the opening of the outer ring, the three connectors connecting the three heaters in series with a power supply,
• the heater has a first heating conductor and a second heating conductor disposed to face each other on both side surfaces of the roller guide groove, which are a pair of heating conductors extending along the central axis,
• the connector has a first connection conductor extending from the second heating conductor of one heater of the two heaters adjacent to each other in the circumferential direction, and a second connection conductor extending from the first heating conductor of another heater, which are a pair of connection conductors extending along the central axis,
• the shield member is provided for each of the connectors, and is disposed between the first connection conductor and the second connection conductor of the connector, and
• a circumferential distance between the first connection conductor and the second connection conductor of the connector is larger than a circumferential distance between the second heating conductor of one heater of the two heaters adjacent to each other in the circumferential direction and the first heating conductor of another heater.