Abstract: A first monocrystalline group III-V compound semiconductor layer is formed on an Si substrate. The surface of the first monocrystalline group III-V compound semiconductor layer is polished. A second monocrystalline group III-V compound semiconductor layer is grown on the polished surface by a metal organic chemical vapor deposition, by using as a group III source material at least partially a source material of group III atoms bonded to ethyl radical at the initial stage of growth, and thereafter by using as the group III source material a source material of group III atoms bonded to methyl radical. A grown layer with a flat surface can be obtained. The surface flatness can be improved further by adding In as a group III element.

Abstract: A drive unit for a rail vehicle has a motor-gearing unit which is supported on at least one wheel-set axle of a bogie and which includes either a motor which extends in the longitudinal direction of the vehicle and has miter gearing units connected to both ends of a motor which extends parallel to the wheel-set axle and has a spur gearing unit coupled with its drive shaft. Each miter gearing unit or the spur gearing has as its output a hollow shaft which concentrically surrounds the respective wheel-set axle. The hollow shaft is connected to the associated wheel-set axle by an elastic coupling which permits axle dislocations and shaft-angle deviations, and also by an elastic bearing which transmits the weight of the motor-gearing unit to the axle. The elastic bearing can be provided laterally of the gearing unit on the hollow shaft, or can be provided within the hollow shaft.

Abstract: A bogie arrangement for self-propelled high-speed rail vehicles with at least two driving bogies supporting the vehicle body. Each of the driving bogies is powered by at least one electric motor and supports the vehicle body by a spring system while having a common pivot point with the vehicle body. The rotor of the fully spring-cushioned and transversely extending motor is operatively connected to the driving wheel set through the intervention of a transmission and a cardan quill shaft having elastic articulated bearings. The motor is held in the space between the wheel set axle and the vertical central transverse plane of the bogie transversely swingably on the understructure of the vehicle body. The longitudinally acting forces of the motor are transmitted by at least one link of considerable length from the housing of the motor to the adjacent frame section of the vehicle.

Abstract: A driving bogie having at least one driving motor, a pair of driven wheel-and-axle units and an axle gear for each of the axles of the wheel-and-axle units rigidly connected with the bogie frame, is arranged with a hollow transmission shaft for the axle gear encircling the axle of a respective wheel-and-axle unit and with a hollow Cardan shaft rigidly connecting the hollow transmission shaft with the wheel-and-axle units through centering articulated couplings. The invention is particularly directed to the structure of the articulated couplings which are formed with a number of hinged levers and with ball joints at the ends of each of the levers, the number of the hinged levers being an even number greater than three, with half of the hinged levers being arranged in the direction of rotation of the coupling and with the other half of the hinged levers being arranged in the opposite direction.

Abstract: A coupling comprising first and second members adapted to be connected respectively to a rotary drive and a rotary driven means subject to displacement from its normal axis of rotation. An elongate member is located intermediate the first and second members and drivingly connected to each member by a plurality of links and connecting pins. Each link includes a pair of connecting pins extending in the same axial direction away from the link. One pin of each link is secured to a flange at one end of the intermediate member, the other pin being secured to a flange of the first or second member at that end of the intermediate member. The links are provided adjacent the side of the flanges opposite one of the first or second rotary members to reduce the angular displacement required of the connecting link pins to accommodate axial displacement of a given distance and to provide a structure in which the elements may be readily assembled and disassembled.

Abstract: A coupling comprising first and second members adapted to be connected respectively to a rotary drive and a rotary driven means subject to displacement from its normal axis of rotation. An elongate member is located intermediate the first and second members and drivingly connected to each member by a plurality of links and connecting pins. Each link includes a pair of connecting pins extending in the same axial direction away from the link. One pin of each link is secured to a flange at one end of the intermediate member, the other pin being secured to a flange of the first or second member at that end of the intermediate member. The links are provided adjacent the side of the flanges opposite one of the first or second rotary members to reduce the angular displacement required of the connecting link pins to accommodate axial displacement of a given distance and to provide a structure in which the elements may be readily assembled and disassembled.