A hydromechanical wheelset control system for a rail vehicle that comprises a leading wheelset and a trailing wheelset that is arranged behind the leading wheelset in the direction of locomotion, with the trailing wheelset having the property of adopting a favorable position in an arc of an undercarriage frame interacting with it and of a rail pair. The wheelset control system is characterized in that a wheelset control is provided that is connected to the leading wheelset control system and to the trailing wheelset control system and that is adapted to hydraulically deflect the leading wheelset in dependence on a deflection of the trailing wheelset, preferably by the same amount as the trailing wheelset, but in the opposite direction.

A running gear for a rail vehicle includes first and second independent wheel assemblies on opposite sides of a longitudinal vertical median plane of the running gear, each having an independent wheel and a bearing assembly for guiding the wheel about a revolution axis fixed relative to the bearing assembly. In a reference position of the running gear, the revolution axes of the first and second wheel assemblies are coaxial and perpendicular to the longitudinal vertical median plane. The running gear further includes one or more steering actuators for moving the bearing assembly of at least one of the two wheel assemblies away from the reference position in a longitudinal direction parallel to the longitudinal vertical median plane, a wheel flange contact detection unit for detecting a contact between a flange of the wheel with a rail, and a controller for controlling the one or more steering actuators.

A chassis for rail vehicles includes at least one first wheel and one second wheel, at least one first wheel bearing having a first wheel bearing housing and a second wheel bearing having a second wheel bearing housing, at least one first primary spring and one second primary spring, at least one primary spring-loaded support structure and at least one active wheel positioning device, which has an actuator unit, where a first bearing and a second bearing are provided between the at least one wheel positioning device and the at least one support structure, and a guide is provided between the at least one wheel positioning device and the first wheel bearing housing, and where the unsuspended mass of the chassis is reduced by the suspension of the wheel positioning device on the primary spring-loaded support structure in order to create advantageous design conditions.

A steering bogie for a railcar includes: a bogie frame supporting a carbody of the railcar; a wheelset including an axle and wheels, the axle extending in a car width direction, the wheels being provided at both respective sides of the axle; and a steering device that presses a pressing target member to steer the wheelset with respect to the bogie frame, the pressing target member being constituted by the wheelset or a member configured to be displaced integrally with the wheelset in a steering direction, the steering device including at least one steering unit, the at least one steering unit including a pressing member that separably contacts the pressing target member to press the pressing target member, and a power mechanism causes the pressing member to contact and separate from the pressing target member.

A method for reducing slack in a linkage chain of a vehicle truck assembly is provided. In one example, the method includes responding to a request to de-lift a lift mechanism by reducing pressure in an actuator coupled to the lift mechanism, where the lift mechanism is configured to transfer a load from a first axle to a second axle of the vehicle during the de-lift, and during the de-lift, maintaining the pressure in the actuator at or above a threshold pressure to maintain tension in a weight transfer device of the lift mechanism.

A failure determination device includes an acquirer to acquire pressure values of air springs provided to bogies included in a vehicle to support a vehicle body included in the vehicle, a compensator to perform compensation of the pressure values of the air springs depending on the position of the vehicle, and a determiner to determine, based on the pressure values of the air springs compensated by the compensator, whether any failure occurs in the air springs.

A railway-vehicles scalable tractive power system, integrated into all-wheel steering and braking systems to leverage synergies between plurality of differently designed electric traction-motors, electric steering motors and electric brake calipers; configured with plurality of sensors to eliminate wheel-dragging at virtually 100% dynamic efficiency. A fully automated electronic clutch-system attached to selected electric traction motors configured to perform above 90% traction efficiency by coupling to wheels selected electric traction-motors in their high efficiency range of operation, or de-coupling and replacing electric traction-motors with another electric traction-motors while the vehicle is changing speed or when it requires higher or lower tractive-power, from forward-motion start to top-rated speed. A holistic controller is configured with multi-objective optimization design (MOOD) procedures; measures complex variable parameters and values, finds the required trade-off among design objectives, and improves pertinence of solutions. Plurality of electronic-couplers is monitoring changing distance between wagons, whereas the controller is maintaining optimal ‘free-slack’ between wagons to prevent ‘run-in’ and ‘run-out’ scenarios with precise maneuverability between electric traction-motors actuation and electric brake-calipers actuation.

A method for reducing slack in a linkage chain of a vehicle truck assembly is provided. In one example, the method includes responding to a request to de-lift a lift mechanism by reducing pressure in an actuator coupled to the lift mechanism, where the lift mechanism is configured to transfer a load from a first axle to a second axle of the vehicle during the de-lift, and during the de-lift, maintaining the pressure in the actuator at or above a threshold pressure to maintain tension in a weight transfer device of the lift mechanism.

A method for reducing slack in a linkage chain of a vehicle truck assembly is provided. In one example, the method includes responding to a request to de-lift a lift mechanism by reducing pressure in an actuator coupled to the lift mechanism, where the lift mechanism is configured to transfer a load from a first axle to a second axle of the vehicle during the de-lift, and during the de-lift, maintaining the pressure in the actuator at or above a threshold pressure to maintain tension in a weight transfer device of the lift mechanism

A chassis for rail vehicles includes at least one support structure, at least one first primary spring and a second primary spring, at least one first drive motor transmission unit connected to the at least one support structure via at least one first suspension element, at least one first wheelset and at least one first clutch connected to the at least one drive motor transmission unit and to the at least first wheelset, wherein the at least first drive motor transmission unit is connected to the at least one support structure via a coupling element that is loadable primarily in the direction of a chassis longitudinal axis so as to create advantageous construction conditions such that an advantageous movability of the support structure and the first wheelset relative to each other is achieved.