According to some embodiments, a load cell for determining a weight of a large object comprises a base plate comprising at least one recessed opening, a bulk metallic glass plug disposed in the at least one recessed opening of the base plate, and a top plate positioned above the base plate. A portion of the top plate is supported by the bulk metallic glass plug. The load cell further comprises a micro strain sensor coupled to the bulk metallic glass plug. The micro strain sensor is operable to determine a change in micro strain on the bulk metallic glass plug. The bulk metallic glass plug extends to a height where the top plate does not contact the base plate.

A bogie frame includes a cross beam extending in a car width direction and including a car width direction middle portion at which a center pin arrangement space is formed. The cross beam includes a pair of pipe members extending in the car width direction and lined up so as to be located away from each other in a car longitudinal direction, and air spring seats provided at upper surfaces of car width direction end portions of the pair of pipe members. At least one of the pair of pipe members 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 pipe members increases. The center pin arrangement space is formed between the pair of pipe members by the curved portion.

A bogie frame includes a cross beam extending in a car width direction and including a car width direction middle portion at which a center pin arrangement space is formed. The cross beam includes a pair of pipe members extending in the car width direction and lined up so as to be located away from each other in a car longitudinal direction, and air spring seats provided at upper surfaces of car width direction end portions of the pair of pipe members. At least one of the pair of pipe members 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 pipe members increases. The center pin arrangement space is formed between the pair of pipe members by the curved portion.

An elastic bushing device of a traction device includes: an outer tube supported by a bogie; an inner tube into which a center pin is fitted, the inner tube being arranged at a radially inner side of the outer tube so as to be spaced apart from the outer tube and also arranged so as to be located higher in position than the outer tube; and an elastic body sandwiched between the inner tube and the outer tube. An outer peripheral surface, opposed to the elastic body, of the inner tube is inclined downward. An inner peripheral surface, opposed to the elastic body, of the outer tube is inclined upward. The elastic body has such a shape that a surface thereof located close to the inner tube is located higher in position than a surface thereof located close to the outer tube.

An elastic bushing device of a traction device includes: an outer tube supported by a bogie; an inner tube into which a center pin is fitted, the inner tube being arranged at a radially inner side of the outer tube so as to be spaced apart from the outer tube and also arranged so as to be located higher in position than the outer tube; and an elastic body sandwiched between the inner tube and the outer tube. An outer peripheral surface, opposed to the elastic body, of the inner tube is inclined downward. An inner peripheral surface, opposed to the elastic body, of the outer tube is inclined upward. The elastic body has such a shape that a surface thereof located close to the inner tube is located higher in position than a surface thereof located close to the outer tube.

Invention includes bogie frame and single link type traction device coupling frame and carbody and transmitting force to carbody, force acting on bogie frame. Single link type traction device includes single link member, receiving seat, and first fastening member. Link member couples center pin of carbody and bogie frame and extends in car longitudinal direction. Receiving seat is provided at fixation target object constituted by center pin or bogie frame, and link member is fixed to receiving seat. First fastening member includes bolt and nut and fixes an end portion of link member to receiving seat. Bolt is inserted into end portion of link member and receiving seat from one side in car longitudinal direction, and nut is threadedly engaged with bolt from other side in car longitudinal direction. Receiving seat includes through hole into which bolt is inserted and nut accommodating space communicating with through hole and accommodating nut.

Invention includes bogie frame and single link type traction device coupling frame and carbody and transmitting force to carbody, force acting on bogie frame. Single link type traction device includes single link member, receiving seat, and first fastening member. Link member couples center pin of carbody and bogie frame and extends in car longitudinal direction. Receiving seat is provided at fixation target object constituted by center pin or bogie frame, and link member is fixed to receiving seat. First fastening member includes bolt and nut and fixes an end portion of link member to receiving seat. Bolt is inserted into end portion of link member and receiving seat from one side in car longitudinal direction, and nut is threadedly engaged with bolt from other side in car longitudinal direction. Receiving seat includes through hole into which bolt is inserted and nut accommodating space communicating with through hole and accommodating nut.

A railcar steering bogie includes: a bogie frame supporting a bolster such that the bolster is swingable relative to the bogie frame about a vertical axis; two wheelsets each including an axle and a pair of wheels; and a steering mechanism configured to steer at least one of the two wheelsets in accordance with the swinging of the bolster relative to the bogie frame. The steering mechanism includes: a steering lever configured to turn relative to the bogie frame about a fulcrum axis; a coupling link coupling the bolster and the steering lever and configured to operate in conjunction with the swinging of the bolster relative to the bogie frame; and a steering link coupled to the steering lever and configured to steer the wheelset in conjunction with the turning of the steering lever. The steering link is coupled to the steering lever by a pin member.

A railcar steering bogie includes: a bogie frame supporting a bolster such that the bolster is swingable relative to the bogie frame about a vertical axis; two wheelsets each including an axle and a pair of wheels; and a steering mechanism configured to steer at least one of the two wheelsets in accordance with the swinging of the bolster relative to the bogie frame. The steering mechanism includes: a steering lever configured to turn relative to the bogie frame about a fulcrum axis; a coupling link coupling the bolster and the steering lever and configured to operate in conjunction with the swinging of the bolster relative to the bogie frame; and a steering link coupled to the steering lever and configured to steer the wheelset in conjunction with the turning of the steering lever. The steering link is coupled to the steering lever by a pin member.

A plate spring unit applied to a railcar bogie includes: a lower plate spring including both longitudinal direction end portions supported by the respective axle boxes from below, the lower plate spring being made of fiber-reinforced resin; an upper plate spring arranged above the lower plate spring with a gap and including a middle portion pressed from above by a pressing member provided at the cross beam, the upper plate spring being made of fiber-reinforced resin; a middle spacer sandwiched between a middle portion of the lower plate spring and the middle portion of the upper plate spring; and an end spacer sandwiched between the end portion of the lower plate spring and an end portion of the upper plate spring and allowing relative displacement between the end portion of the lower plate spring and the end portion of the upper plate spring in a longitudinal direction.