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 drive system for a rail vehicle includes at least one drive motor and at least one cooling apparatus for cooling the at least one drive motor and/or other components of the drive system, in particular a current converter. The drive system is constructed and intended to use kinetic energy of the rail vehicle for operation of the cooling apparatus. A rail vehicle having the drive system and methods for the forward movement of a rail vehicle are also provided.

A drive system for a rail vehicle includes at least one drive motor and at least one cooling apparatus for cooling the at least one drive motor and/or other components of the drive system, in particular a current converter. The drive system is constructed and intended to use kinetic energy of the rail vehicle for operation of the cooling apparatus. A rail vehicle having the drive system and methods for the forward movement of a rail vehicle are also provided.

A method for managing power consumption of a railway vehicle is provided. The power consumption of the railway vehicle is managed by a central control unit that receives information representing an amount of electrical traction power required for traction or generated by electrodynamic braking based on a traction demand set by the driver of the railway vehicle. The central control unit additionally receives information representing an amount of electrical auxiliary power demanded by auxiliary devices from control units of the respective auxiliary devices. The total available electrical power, which can be provided by the energy supply line for the railway vehicle, is determined. The central control unit prioritizes operation of the auxiliary devices based on the total available electrical power and the electrical traction power required for traction to selectively reduce consumption of electrical energy by all or selected auxiliary devices.

A method for managing power consumption of a railway vehicle is provided. The power consumption of the railway vehicle is managed by a central control unit that receives information representing an amount of electrical traction power required for traction or generated by electrodynamic braking based on a traction demand set by the driver of the railway vehicle. The central control unit additionally receives information representing an amount of electrical auxiliary power demanded by auxiliary devices from control units of the respective auxiliary devices. The total available electrical power, which can be provided by the energy supply line for the railway vehicle, is determined. The central control unit prioritizes operation of the auxiliary devices based on the total available electrical power and the electrical traction power required for traction to selectively reduce consumption of electrical energy by all or selected auxiliary devices.

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.

A semiconductor device according to an embodiment includes a semiconductor chip having a transistor region and a diode region, and a conductor. The semiconductor chip includes a first electrode, a second electrode, a silicon carbide layer between the first electrode and the second electrode, and a gate electrode. The first electrode includes a first region in the transistor region and a second region in the diode region. A first contact area between the conductor and the first region is larger than a second contact area between the conductor and the second region.

The present disclosure provides a gearbox of a rail vehicle, which belongs to the technical field of gear transmission. The gearbox of the present disclosure comprises a driving shaft, a driven shaft, a first bearing seat and a second bearing seat; the gearbox further comprises: a first roller bearing, a ball bearing, a bearing inner retaining ring and a bearing outer retaining ring for drainage, which are arranged between the first bearing seat and the driving shaft; wherein, the bearing inner retaining ring and the bearing outer retaining ring are provided between the first roller bearing and the ball bearing along an axial direction of the driving shaft, and a first drainage channel is provided on the bearing outer retaining ring, a second drainage channel is provided on the first bearing seat; wherein, the lubricating oil can be guided into the first roller bearing and the ball bearing from the outside of the first bearing seat through the second drainage channel and the first drainage channel in sequence. The present disclosure can greatly improve the lubricating performance of the first roller bearing and the ball bearing on the driving shaft of the gearbox, and is particularly suitable for low-temperature working conditions.

The present disclosure provides a gearbox of a rail vehicle, which belongs to the technical field of gear transmission. The gearbox of the present disclosure comprises a driving shaft, a driven shaft, a first bearing seat and a second bearing seat; the gearbox further comprises: a first roller bearing, a ball bearing, a bearing inner retaining ring and a bearing outer retaining ring for drainage, which are arranged between the first bearing seat and the driving shaft; wherein, the bearing inner retaining ring and the bearing outer retaining ring are provided between the first roller bearing and the ball bearing along an axial direction of the driving shaft, and a first drainage channel is provided on the bearing outer retaining ring, a second drainage channel is provided on the first bearing seat; wherein, the lubricating oil can be guided into the first roller bearing and the ball bearing from the outside of the first bearing seat through the second drainage channel and the first drainage channel in sequence. The present disclosure can greatly improve the lubricating performance of the first roller bearing and the ball bearing on the driving shaft of the gearbox, and is particularly suitable for low-temperature working conditions.