Abstract: An elastic bushing includes a recess at a portion of an outer peripheral surface of the elastic bushing which portion is located at an inner side in a car longitudinal direction, the recess being recessed outward in the car longitudinal direction. A tubular portion of an axle beam includes a convex stopper portion protruding outward in the car longitudinal direction from a part of an inner peripheral surface of the tubular portion which part is located at the inner side in the car longitudinal direction, the stopper portion being inserted into the recess with a gap between the stopper portion and a bottom surface of the recess. A thickness of the elastic bushing at the recess in a radial direction is equal to or less than half a thickness of a portion of the elastic bushing in the radial direction which portion is located adjacent to the recess.

Abstract: 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.

Abstract: A railcar bogie includes: 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 coupling member arranged under the cross beam and between the first traction motor and the second traction motor and coupling the first traction motor and the second traction motor to each other.

Abstract: A method of assembling a railcar bogie includes: a positioning step of locking a wheelbase fixing jig to a pair of axle box devices to position the pair of axle box devices such that a wheelbase between a pair of wheelsets supported by the respective axle box devices becomes a predetermined designed value, the pair of axle box devices being arranged away from each other in a car longitudinal direction, the wheelbase fixing jig extending in the car longitudinal direction; a plate spring arranging step of making the pair of axle box devices support a plate spring extending in the car longitudinal direction; and a bogie frame arranging step of making a longitudinal direction middle portion of the plate spring support a bogie frame and coupling the bogie frame to the pair of axle box devices.

Abstract: A bearing temperature detector of a railcar bogie includes: a temperature sensor unit passing through an opening of an axle box accommodating a bearing supporting an axle and configured to detect a temperature of an outer ring of the bearing; an elastic body configured to bias the temperature sensor unit toward the outer ring; and a temperature sensor unit support seat including a substrate portion to which the temperature sensor unit is attached via the elastic body, the temperature sensor unit support seat being detachably fixed to the axle box from an outside of the axle box.

Abstract: 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.

Abstract: A method of assembling a railcar bogie includes: a plate spring arranging step of making a pair of axle boxes support a plate spring extending in a car longitudinal direction, the axle boxes being arranged away from each other in the car longitudinal direction; a bogie frame arranging step of placing a bogie frame directly or indirectly on a longitudinal direction middle portion of the plate spring from above, the bogie frame including a side wall on which an opening is formed, the side wall covering the plate spring from an outside in a car width direction; and a measuring step of measuring a positional deviation between the plate spring and the bogie frame in the car longitudinal direction through the opening.

Abstract: An axle box suspension of a railcar includes: a coupler extending from the axle box in a car longitudinal direction and including a tubular portion at a tip end portion of the coupler, the tubular portion opens toward both sides in a car width direction, the coupler coupling the axle box and a bogie frame; a core rod inserted into an internal space of the tubular portion, a pair of protruding portions provided at both respective sides of the core rod in the car width direction; an elastic bushing interposed between the tubular portion and the core rod; a pair of receiving seats at the bogie frame, including a pair of recess portions and a pair of groove portions, a pair of lids supporting the pair of protruding portions fitted into the pair of groove portions, and fasteners fixing the lids to the receiving seats.

Abstract: A railcar bogie includes: 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 coupling member arranged under the cross beam and between the first traction motor and the second traction motor and coupling the first traction motor and the second traction motor to each other.

Abstract: A railcar steering bogie includes a bogie frame, a wheelset, an axle box suspension, a steering mechanism configured to steer the wheelset, a brake unit, and a brake unit support link. The brake unit includes: a main body frame; a brake shoe supported by the main body frame and pressed against a wheel tread of the wheel during braking. The brake unit support link couples the axle box suspension and the brake unit and transmits displacement of the axle box in a car longitudinal direction to the brake unit at least during steering performed by the steering mechanism. The brake unit support link restricts the brake unit from being displaced outward in a car width direction by a predetermined distance or more during the braking. At least one of a side surface of the brake unit support link and a side surface of the brake unit includes a sliding surface.

Abstract: 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.

Abstract: An elastic bushing includes a recess at a portion of an outer peripheral surface of the elastic bushing which portion is located at an inner side in a car longitudinal direction, the recess being recessed outward in the car longitudinal direction. A tubular portion of an axle beam includes a convex stopper portion protruding outward in the car longitudinal direction from a part of an inner peripheral surface of the tubular portion which part is located at the inner side in the car longitudinal direction, the stopper portion being inserted into the recess with a gap between the stopper portion and a bottom surface of the recess. A thickness of the elastic bushing at the recess in a radial direction is equal to or less than half a thickness of a portion of the elastic bushing in the radial direction which portion is located adjacent to the recess.

Abstract: A railcar bogie axle box suspension axle beam includes an end portion d at a tip end, a tubular portion at the end portion and being open at both car width direction sides. The tubular portion includes: a first semi-tubular portion integrally formed with a main body portion; a second semi-tubular portion brought into contact with the first semi-tubular portion from one side in the car longitudinal direction; and a bolt fastening the second semi-tubular portion to the first. The first semi-tubular portion includes: a flat opposing surface contacting the second semi-tubular portion; and a hole into which the bolt is inserted. The second semi-tubular portion includes: a flat opposing surface contacting with the first semi-tubular portion surface; a flat machining reference surface formed at an opposite side of the opposing surface; and a hole extending in a direction perpendicular to the opposing surface, the bolt inserted into the hole.

Abstract: A railcar bogie includes: a cross beam supporting a carbody of a railcar; an axle box including a bearing accommodating portion accommodating a bearing rotatably supporting a wheelset; a plate spring extending in a car longitudinal direction while supporting a car width direction end portion of the cross beam; and a receiving member provided above the axle box and supporting a car longitudinal direction end portion of the plate spring, an attachment hole being formed at a car longitudinal direction outside portion of the receiving member, a lifting fitting used to lift the bogie being attached to the attachment hole.

Abstract: A railcar bogie includes a plate spring supported by a pair of axle boxes arranged away from each other in a car longitudinal direction, the plate spring supporting a cross beam while being pressed by a pressing member of a bogie frame from above such that the pressing member is separable from the plate spring, at least a lower surface of the plate spring containing resin. The lower surface of the plate spring includes an inclined surface inclined with respect to a horizontal direction when viewed from a car width direction. The bogie frame includes at least one lifting supporting portion, the at least one lifting supporting portion including a supporting surface, the supporting surface being opposed to the inclined surface of the plate spring from below with a gap and inclined along the inclined surface of the plate spring.

Abstract: A railcar bogie includes a wheelset, a bearing rotatably supporting the wheelset, an axle box, and an obstacle deflector. The wheelset includes: an axle and a pair of wheels provided at both car width direction sides of the axle. The axle box includes: an upper axle box element covering the bearing from above; and a lower axle box element fixed to the upper axle box element and covering the bearing from below. The obstacle deflector includes an obstacle deflecting portion and a coupling portion. The obstacle deflecting portion is arranged at one side of the wheel in a car longitudinal direction and, when viewed from the one side in the car longitudinal direction, overlaps the wheel. The coupling portion couples the obstacle deflecting portion to the axle box. The coupling portion of the obstacle deflector is fixed to a receiving seat provided at the upper axle box element.

Abstract: 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.

Abstract: An axle box suspension includes: a coupler extending from an axle box in a car longitudinal direction and including a tubular portion at an end portion of the coupler, the tubular portion being open toward both sides in a car width direction; a core rod inserted into an internal space of the tubular portion, a pair of protruding portions being provided at both sides of the core rod in the car width direction; an elastic body interposed between the tubular portion and the core rod; a pair of receiving seats provided at the bogie frame and including a pair of groove portions which are open toward the car width direction and an upper side; a pair of lids pressing, from above, the pair of protruding portions fitted into the pair of groove portions from above; and fasteners fixing the lids to the receiving seats.

Abstract: A railcar steering bogie includes: a bogie frame including a cross beam; pair of axles; axle boxes accommodating bearings; axle box suspensions each including a coupling member coupling the corresponding axle box and bogie frame while allowing relative displacement in a car longitudinal direction; plate spring extending in the car longitudinal direction and including car longitudinal direction end portions extending obliquely upward along the car longitudinal direction and supported above the respective axle boxes and a car longitudinal direction middle portion unfixedly arranged under the cross beam; support seats including respective inclined upper surfaces and supporting the both respective longitudinal direction end portions of the plate spring; and gap bodies each provided between an upper surface of the corresponding axle box suspension and a lower surface of the corresponding support seat and configured to allow displacement of the axle box suspension and the support seat in the car longitudinal direct

Abstract: A railcar bogie includes a cross beam, an axle box, a supporting member, a plate spring, and an axle beam. The axle box accommodates a bearing rotatably supporting a wheelset. The supporting member is provided at an upper portion of the axle box. The plate spring supports a car width direction end portion of the cross beam and extends in a car longitudinal direction, and the plate spring includes a car longitudinal direction end portion supported by the supporting member. The axle beam couples the axle box and the cross beam in the car longitudinal direction and is opposed to the plate spring in an upward/downward direction. An installation seat is provided at an upper surface of the axle beam and includes an installation surface on which a pushing-up device configured to push up a lower surface of the plate spring can be placed.