Railcar state monitoring device and train set including same

1. A railcar state monitoring device for use in a train set constituted by adjacent first and second cars each including a carbody, a pair of bogies arranged at both respective longitudinal direction end portions of the carbody and supporting the carbody, and underfloor devices provided between the pair of bogies, the state monitoring device comprising:

sensors provided at a plurality of the bogies and configured to detect state information of devices provided at those bogies;

wireless transmitters provided at the bogies with sensors and configured to wirelessly transmit sensor signals containing the detected state information; and

at least one wireless receiver configured to receive the sensor signals wirelessly transmitted from the wireless transmitters, the at least one wireless receiver including a first wireless receiver arranged between a first bogie of the first car located nearest to the second car and second bogie of the second car located nearest to the first car, the first wireless receiver being configured to receive the state information of the first bogie and the state information of the second bogie.

2. The railcar state monitoring device according to claim 1 , wherein the wireless receiver is attached to lower portions of both longitudinal direction end portions of the carbody of one of the first car and the second car.

3. The railcar state monitoring device according to claim 2 , wherein the carbody of the one car further includes a memory device configured to store the sensor signals received by the wireless receiver.

4. The railcar state monitoring device according to claim 1 , wherein:

the train set further includes a third car adjacent to the second car the third car including a carbody and a pair of bogies,

the state monitoring device further includes at least one memory device configured to store the sensor signals received by the wireless receiver,

the at least one wireless receiver further includes a second wireless receiver arranged between a third bogie of the second car located nearest to the third car and a fourth bogie of the third car located nearest to the second car,

the second wireless receiver is configured to receive the state information of the third bogie and the state information of the fourth bogie,

the at least one memory device includes a first memory device and a second memory device,

the first memory device is provided at the first car and stores the sensor signals received by the first wireless receiver, and

the second memory device is provided at the third car and stores the sensor signals received by the second wireless receiver.

5. The railcar state monitoring device according to claim 4 , wherein:

the first wireless receiver is provided at the first car; and

the second wireless receiver is provided at the third car.

6. The railcar state monitoring device according to claim 3 , wherein the memory device stores the sensor signal so as to associate an ID of the sensor with a detection target device of the sensor.

7. The railcar state monitoring device according to claim 1 , wherein each of the bogies is provided with four sensors.

8. The railcar state monitoring device according to claim 7 , further comprising:

a plurality of casings, each containing one of the sensors and one of the wireless transmitters,

wherein each casing is provided at an axle box of one of the bogies.

9. The railcar state monitoring device according to claim 1 , wherein the first wireless receiver is attached to a lower portion of a longitudinal direction end portion nearest to the second car, of the carbody of the first car.

10. The railcar state monitoring device according to claim 9 , wherein the first wireless receiver is attached to an underframe of the carbody of the first car.

11. The railcar state monitoring device according to claim 10 , wherein the first wireless receiver is attached to a car width direction middle portion of an end beam of the underframe.

12. A train set comprising:

adjacent first and second cars each including:

a carbody;

a pair of bogies arranged at both respective longitudinal direction end portions of the carbody and supporting the carbody; and

underfloor devices provided between the pair of bogies; and

a state monitoring device including:

sensors provided at a plurality of the bogies and configured to detect state information of devices provided at those bogies;

wireless transmitters provided at the bogies with sensors and configured to wirelessly transmit sensor signals containing the detected state information; and

at least one wireless receiver configured to receive the sensor signals wirelessly transmitted from the wireless transmitters, the at least one wireless receiver being arranged between a first bogie of the first car located nearest to the second car and a second bogie of the second car located nearest to the first car, the at least one wireless receiver being configured to receive the state information of the first bogie and the state information of the second bogie,

wherein the first car has one of the at least one wireless receiver, and the second car does not have one of the at least one wireless receiver.

13. The train set according to claim 12 , wherein the first wireless receiver is attached to a lower portion of a longitudinal direction end portion, nearest to the second car, of the carbody of the first car.

14. The train set according to claim 13 , wherein the first wireless receiver is attached to an underframe of the carbody of the first car.

15. The train set according to claim 14 , wherein the first wireless receiver is attached to a car width direction middle portion of an end beam of the underframe.