Railcar adapter, for connecting a railcar body to a bearing, having a bearing seat side secured to the bearing and a frame seat side mounted in a bogie frame of the railcar body is provided. The railcar adapter includes a top cover in contact with the railcar body, forming the frame seat side, a bearing seat adapted to be mounted on the bearing, forming the bearing seat side and at least one damping element located between the top cover and the bearing seat.

Railcar adapter, for connecting a railcar body to a bearing, having a bearing seat side secured to the bearing and a frame seat side mounted in a bogie frame of the railcar body is provided. The railcar adapter includes a top cover in contact with the railcar body, forming the frame seat side, a bearing seat adapted to be mounted on the bearing, forming the bearing seat side and at least one damping element located between the top cover and the bearing seat.

A railcar axle box includes an axle box main body accommodating a bearing supporting an axle. The axle box main body includes: an inner surface defining an accommodating space accommodating the bearing; a first side surface provided at an outer side of the inner surface and at one car width direction side of a car width direction center of the accommodating space; and a second side surface provided at an outer side of the inner surface and at the other car width direction side of the center. A shortest distance between the first side surface and the car width direction center of the accommodating space and a shortest distance between the second side surface and the center are equal to each other in a car width direction.

A railcar axle box includes an axle box main body accommodating a bearing supporting an axle. The axle box main body includes: an inner surface defining an accommodating space accommodating the bearing; a first side surface provided at an outer side of the inner surface and at one car width direction side of a car width direction center of the accommodating space; and a second side surface provided at an outer side of the inner surface and at the other car width direction side of the center. A shortest distance between the first side surface and the car width direction center of the accommodating space and a shortest distance between the second side surface and the center are equal to each other in a car width direction.

The traditional three piece railway freight truck prevents the wheel sets from achieving radial alignment to curves by the rigid side frames restraining the wheelsets. The side frames also constrain the wheelset from radial aligning to curves by the limited gap between the wheelset bearing and the side frame pedestal jaws.

The present invention opens the side frame pedestal jaws to allow the wheel sets to yaw and align radially to curves. The side frame is supported on wheel sets by elastomeric pads and bearing adapters. The present invention utilizes the elastomeric pad stiffness to compress in pitch motion that allow the wheel set to move in an arc forward or backward in the open jaws of the side frame. The elastomeric pad stiffness also allows the wheelset to twist the pads allowing the wheelset to radially align to the curve. The pads elastic stiffness is sufficient to return when the wheelset is align to straight track.

A railcar adapter for connecting a railcar body to a bearing is provided. The railcar adapter includes an adapter body having two lateral channels each delimited by a pair of opposed lugs adapted to cooperate with the railcar body, an inner surface acting as a bearing seat for the bearing and an outer surface in radial contact with the railcar body. The inner surface includes at least one central groove located on a first axis of symmetry of the railcar adapter emerging in each lateral channel. The inner surface further provides a second central groove located on a second symmetry axis of the railcar adapter, perpendicular to the first symmetry axis.

A railcar adapter for connecting a railcar body to a bearing is provided. The railcar adapter includes an adapter body having two lateral channels each delimited by a pair of opposed lugs adapted to cooperate with the railcar body, an inner surface acting as a bearing seat for the bearing and an outer surface in radial contact with the railcar body. The inner surface includes at least one central groove located on a first axis of symmetry of the railcar adapter emerging in each lateral channel. The inner surface further provides a second central groove located on a second symmetry axis of the railcar adapter, perpendicular to the first symmetry axis.

Railcar adapter, for connecting a railcar body to a bearing, having a bearing seat side secured to the bearing and a frame seat side mounted in a bogie frame of the railcar body is provided. The railcar adapter includes a top cover in contact with the railcar body, forming the frame seat side, a bearing seat adapted to be mounted on the bearing, forming the bearing seat side and at least one damping element located between the top cover and the bearing seat.

Railcar adapter, for connecting a railcar body to a bearing, having a bearing seat side secured to the bearing and a frame seat side mounted in a bogie frame of the railcar body is provided. The railcar adapter includes a top cover in contact with the railcar body, forming the frame seat side, a bearing seat adapted to be mounted on the bearing, forming the bearing seat side and at least one damping element located between the top cover and the bearing seat.

A railcar bogie includes: a cross beam supporting a carbody; a pair of front and rear axles sandwiching and arranged in front of and behind the cross beam in a railcar longitudinal direction to extend in a railcar width direction; bearings provided at both railcar width direction sides of each and rotatably supporting the axles; axle boxes accommodating the bearings; side members extending in the railcar longitudinal direction supporting both railcar width direction end portions of the cross beam and each including both railcar longitudinal direction end portions supported by the axle boxes; contact members provided at both railcar width direction end portions and disposed on railcar longitudinal direction middle portions of the side members so as not to be fixed to the side members in an upper-lower direction; and supporting members provided at the axle boxes and supporting the railcar longitudinal direction end portions of the side members.