Railcar bogie frame

A railcar bogie frame, comprising

• a cross beam extending in a car width direction and including a car width direction middle portion at which there is a center pin arrangement space, wherein:
• the cross beam includes
• a pair of elongated supports extending in the car width direction and located away from each other in a car longitudinal direction and
• air spring seats at upper surfaces of car width direction end portions of the pair of elongated supports;
• at least one of the pair of elongated supports includes a curved portion at a car width direction middle portion thereof, the curved portion projecting outward in the car longitudinal direction such that a clearance between the pair of elongated supports increases;
• the center pin arrangement space is between the pair of elongated supports by the curved portion;
• wherein the cross beam further includes:
• a pair of intermediate structures at both sides of the center pin arrangement space in the car width direction and extending in the car width direction, each of the pair of intermediate structures being connected to the pair of elongated supports while being sandwiched between the car width direction end portions.

A railcar bogie frame, comprising

• a cross beam extending in a car width direction and including a car width direction middle portion at which there is a center pin arrangement space, wherein:
• the cross beam includes
• a pair of elongated supports extending in the car width direction and located away from each other in a car longitudinal direction and
• air spring seats at upper surfaces of car width direction end portions of the pair of elongated supports;
• at least one of the pair of elongated supports includes a curved portion at a car width direction middle portion thereof, the curved portion projecting outward in the car longitudinal direction such that a clearance between the pair of elongated supports increases;
• the center pin arrangement space is between the pair of elongated supports by the curved portion;
• the cross beam further includes a center pin accommodating structure between the pair of elongated supports and forming the center pin arrangement space;
• and
• the center pin accommodating structure includes a longitudinal attaching portion joined to an inner side surface of the curved portion, the inner side surface being opposed to the center pin accommodating structure and having a circular-arc shape, the longitudinal attaching portion including a joining end having a circular-arc shape in a plan view.