Bearing temperature detector of railcar bogie

1. A bearing temperature detector of a railcar bogie, the bearing temperature detector comprising:

a temperature sensor passing through an opening of an axle box, the axle box accommodating a bearing supporting an axle and the temperature sensor being configured to detect a temperature of an outer ring of the bearing;

a pair of elastic bodies configured to bias the temperature sensor toward the outer ring, the pair of elastic bodies respectively arranged at a first side and a second side of the temperature sensor; and

a temperature sensor support seat including a substrate, the temperature sensor being attached to the substrate via the pair of elastic bodies, and the temperature sensor support seat being detachably fixed to the axle box from an outside of the axle box, wherein

each of the pair of elastic bodies are sandwiched between the temperature sensor support seat and the temperature sensor.

2. The bearing temperature detector according to claim 1 , wherein:

the temperature sensor includes a wireless transmitter configured to transmit information of a detected temperature as a wireless signal;

an insertion hole is formed at the substrate; and

the temperature sensor is inserted into the insertion hole and exposed to an outside of the temperature sensor support seat.

3. The bearing temperature detector according to claim 1 , wherein the temperature sensor support seat includes a side plate portion projecting from the substrate toward the axle box, the side plate portion covering the temperature sensor and including a gap between the side plate portion and the temperature sensor.

4. A bearing temperature detector of a railcar bogie, the bearing temperature detector comprising:

a temperature sensor passing through an opening of an axle box, the axle box accommodating a bearing supporting an axle, and the temperature sensor being configured to detect a temperature of an outer ring of the bearing;

an elastic body configured to bias the temperature sensor toward the outer ring;

a temperature sensor support seat including a substrate, the temperature sensor being attached to the substrate via the elastic body, and the temperature sensor support seat being detachable fixed to the axle box from an outside of the axle box; and

an axle box lower portion constituting a part of the axle box, the axle box lower portion covering the outer ring from below, wherein

the opening is formed at a part of the axle box lower portion, the part of the axle box lower portion being opposed to the bearing and including a gap between the part of the axle box lower portion and the bearing.

5. The bearing temperature detector according to claim 4 , wherein the axle box lower portion further includes outer ring supporting portions located at both respective car width direction sides of the opening, the outer ring supporting portions projecting upward and supporting the outer ring.

6. The bearing temperature detector according to claim 4 , wherein:

the axle box lower portion further includes a side wall portion projecting downward, the side wall portion being opposed to the axle box lower portion and including a gap between the side wall portion and the axle box lower portion; and

the temperature sensor support seat is detachably fixed to the side wall portion at the outside of the axle box.

7. The bearing temperature detector according to claim 4 , wherein:

the axle box lower portion further includes a leg portion projecting downward;

the temperature sensor projects lower than the temperature sensor support seat; and

a lower end of the leg portion is located lower than a lower end of the temperature sensor.

8. The bearing temperature detector according to claim 4 , wherein the axle box lower portion is a wheelset support detachably fixed to an axle box main body, the axle box main body covering the outer ring from above.