A closed socket brazed joint assembly is provided. The assembly comprises: a first member composed of a first base material; a second member composed of a second base material with a first end composed of a first profile with at least first and second faying surfaces; a socket formed in said first member configured to receive the first end of the second member with a faying surface with at least two portions separated by a first fillet; wherein the socket further is configured such that in a first state before the application of energy to the joint there is a gap with a width between the faying surfaces of the first member and the faying surfaces of the second member; and, in the first state a slug of brazing fill material is disposed between the first end of the second member and at least one faying surface of the socket; and, wherein a second state is created when upon application of energy the brazing fill material melts and flows from between first end of the second member and the at least one faying surface of the socket filling aforesaid gap between the faying surfaces of the first and second members.

Disclosed is a bogie framework of a rail vehicle and a bogie, wherein the bogie framework of the rail vehicle includes a first end beam (01), a second end beam (02) and a box beam disposed between the first end beam (01) and the second end beam (02). The box beam includes a primary gearbox (1) and a secondary gearbox (2), and the primary gearbox (1) is used for connecting a traction motor and the secondary gearbox (2). The secondary gearbox (2) is disposed between the primary gearbox (1) and the first end beam (01), as well as between the primary gearbox (1) and the second end beam (02).

Disclosed is a gearbox for rail vehicle, a bogie for rail vehicle and a rail vehicle. The gearbox for rail vehicle includes a primary gearbox (1) configured to connect with a traction motor, and a secondary gearbox (2) arranged on both sides of the primary gearbox (1) along a longitudinal direction of the rail vehicle, wherein a framework bearing beam is formed by connecting the primary gearbox (1) and the secondary gearbox (2), the primary gearbox (1) is configured to transmit power from the traction motor to the secondary gearbox (2), and the secondary gearbox (2) are configured to transmit power from the primary gearbox (1) to wheelsets of the rail vehicle.

A semiconductor device of an embodiment includes a first trench extending in a first direction in a silicon carbide layer; a second trench and a third trench adjacent to each other in the first direction; a first silicon carbide region of n type; a second silicon carbide region of p type on the first silicon carbide region; a third silicon carbide region of n type on the second silicon carbide region; a fourth silicon carbide region of p type between the first silicon carbide region and the second trench; a fifth silicon carbide region of p type between the first silicon carbide region and the third trench; a gate electrode in the first trench; a first electrode, part of which is in the second trench, the first electrode contacting the first silicon carbide region between the fourth silicon carbide region and the fifth silicon carbide region; and a second electrode.

The disclosure is directed to an apparatus for generating energy in response to a vehicle wheel rotation. The apparatus may include a first roller comprising a curved roller surface configured to be positioned in substantial physical contact with a first wheel of the vehicle. The first roller may be configured to rotate in response to a rotation of the first wheel. The apparatus may further include a first shaft rotatably couplable to the first roller such that rotation of the first roller causes the first shaft to rotate. The apparatus may further include a first generator operably coupled to the first shaft. The generator may be configured to generate an electrical output based on the rotation of the first shaft and convey the electrical output to an energy storage device or to a motor of the vehicle that converts electrical energy to mechanical energy to rotate one or more wheels of the vehicle.

A motor/generator/transmission system includes: an axle; a stator ring having a plurality of stator coils disposed around the periphery of the stator ring, wherein each phase of the plurality of stator coils includes a respective set of multiple parallel non-twisted wires separated at the center tap with electronic switches for connecting the parallel non-twisted wires of each phase of the stator coils all in series, all in parallel, or in a combination of series and parallel; a rotor support structure coupled to the axle; a first rotor ring and a second rotor ring each having an axis of rotation coincident with the axis of rotation of the axle, at least one of the first rotor ring or the second rotor ring being slidably coupled to the rotor support structure and configured to translate along the rotor support structure in a first axial direction or in a second axial direction.

A flexible gear coupling includes two external gears and two internal gears meshing with the respective two external gears. A tooth root crowning radius of each external gear is smaller than a tooth tip crowning radius of the external gear. The external gear is formed such that a reference tooth height that is a tooth height at a tooth width direction middle position is smaller than an end tooth height that is a tooth height at a tooth width direction end position. A ratio of the end tooth height to the reference tooth height is set to 1.21 or more, and/or a ratio Rc/Rb of the tooth root crowning radius to the tooth tip crowning radius is set to 0.37 or less.

A system for propelling a levitated train is provided. The system includes a pair of wheel assembly adapted to be received onto a rail head of a rail, wherein a rail head comprises of a first side, a second side, wherein each wheel assembly of the pair of wheel assembly is configured to be placed on the first side and the second side of the rail head. Further, each wheel assembly comprises of a wheel, a shaft and a motor. The wheel is configured to be placed horizontally to the railhead, wherein the wheel comprises of a first flange, a second flange and a wheel face. The wheel face is adapted to be in contact with the first side of the rail head and the motor comprises of a first end and a second end, wherein the first end is adapted to be connected to one side of the train and the second end is adapted to be connected vertically to the wheel via a shaft. Further, the wheel in each pair of wheel assembly is configured to rotate, by the motor, in the opposite direction, thereby propelling a levitated train. Further, the advantage of this system is no vertical load of the weight of the train on the rails and multiple electric motors can be used sharing the power needed to drive the train instead of one or two large motors.

An electric machine has a rotor on a rotor shaft. The rotor shaft is supported on bearings such that the rotor and the rotor shaft are rotatable around an axis of rotation. The rotor is surrounded radially on the outside by a stator, the stator by a casing. Covering elements are arranged at the axial ends of the rotor and stator, by which the rotor and the stator are enclosed with respect to the environment of the electric machine. One covering element is surrounded radially on the outside, and axially on the side facing away from the rotor and stator there, by an air guide element, the other covering element by an inner ring element. First and second cooling channels running axially are arranged in the casing or between the casing and stator. Rotor channels running axially are arranged in the rotor shaft and/or in the rotor.

An electric machine has a rotor on a rotor shaft. The rotor shaft is supported on bearings such that the rotor and the rotor shaft are rotatable around an axis of rotation. The rotor is surrounded radially on the outside by a stator, the stator by a casing. Covering elements are arranged at the axial ends of the rotor and stator, by which the rotor and the stator are enclosed with respect to the environment of the electric machine. One covering element is surrounded radially on the outside, and axially on the side facing away from the rotor and stator there, by an air guide element, the other covering element by an inner ring element. First and second cooling channels running axially are arranged in the casing or between the casing and stator. Rotor channels running axially are arranged in the rotor shaft and/or in the rotor.