Railcar driving bogie

1. A railcar bogie comprising:

a cross beam extending in a car width direction;

a first traction motor supported by a first car longitudinal direction portion of the cross beam;

a second traction motor supported by a second car longitudinal direction portion of the cross beam; and

a coupler (i) arranged under the cross beam and between the first traction motor and the second traction motor, (ii) coupling the first traction motor and the second traction motor to each other, and (iii) configured to cancel out a swinging motion of the first traction motor and a swinging motion of the second traction motor, wherein

the first traction motor is arranged at a first side in the car width direction;

the second traction motor is arranged at a second side in the car width direction;

in a plan view, a swing axis of the first traction motor is inclined relative to the car width direction; and

in the plan view, a swing axis of the second traction motor is inclined relative to the car width direction.

2. The railcar bogie according to claim 1 , wherein in the plan view, the swing axis of the first traction motor and the swing axis of the second traction motor are substantially perpendicular to a virtual line connecting a gravity center of the first traction motor and a gravity center of the second traction motor.

3. The railcar bogie according to claim 2 , wherein the coupling member extends along the virtual line.

4. The railcar bogie according to claim 1 , further comprising:

a first traction motor receiving seat provided at the first car longitudinal direction portion of the cross beam, the first traction motor being attached to the first traction motor receiving seat; and

a second traction motor receiving seat provided at the second car longitudinal direction portion of the cross beam, the second traction motor being attached to the second traction motor receiving seat, wherein:

the first traction motor receiving seat includes a keyway to which the first traction motor is attached;

the second traction motor receiving seat includes a keyway to which the second traction motor is attached;

the first traction motor is attached to the first traction motor receiving seat so as to swing about the keyway serving as the swing axis of the first traction motor; and

the second traction motor is attached to the second traction motor receiving seat so as to swing about the keyway serving as the swing axis of the second traction motor.

5. The railcar bogie according to claim 4 , wherein:

a car width direction middle portion of the cross beam includes curved portions projecting toward both sides in a car longitudinal direction, the curved portions including inclined surfaces inclined relative to the car width direction; and

the first traction motor receiving seat and the second traction motor receiving seat are provided on respective inclined surfaces of the curved portions.

6. A railcar bogie comprising:

a cross beam extending in a car width direction;

a first traction motor supported by a first car longitudinal direction portion of the cross beam;

a second traction motor supported by a second car longitudinal direction portion of the cross beam; and

a coupler (i) arranged under the cross beam and between the first traction motor and the second traction motor, (ii) coupling the first traction motor and the second traction motor to each other, and (iii) configured to cancel out a swinging motion of the first traction motor and a swinging motion of the second traction motor, wherein

the first traction motor is arranged at a first side in the car width direction;

the second traction motor is arranged at a second side in the car width direction; and

in a plan view, each of a swing axis of the first traction motor and a swing axis of the second traction motor is inclined relative to the car width direction such that a bogie middle side of each of the swing axes extends away from a center of the cross beam.