No abstract

The problems of traction properties increase in locomotives are considered. The necessity in devices for instantaneous control of a friction coefficient of wheels and rails based on the impact of electric current or a magnetic field upon a wheel/rail contact area. There are defined basic fields of researches essential for the actual realization of such devices. It is defined that devices based on electric current impact require the introduction of considerable changes in the units of a crew part for wheel pair insulation and searches of problem solution in the separation of traction current and control one and the prevention of control current impact upon alarm systems. It is offered to consider magnetic amplifiers of adhesion as a solution of a short-term outlook which can be introduced in an existing locomotive fleet and those using current impact as a solution of newly-developed promising machines. There is offered a design of an individual traction drive simplifying a problem in the arrangement of devices for instantaneous control of a friction coefficient.

The paper considers problems of import substitution of parts for wheels and motors units for freight and shunting diesel locomotives with 1050 and 1250 mm wheels and it also considers a task of modernization of technically outdated assemblies. In result of the analysis the authors revealed that it is necessary to: 1) develop a new assembly of motor support bearings with the use of domestic parts; 2) create a new design of an electric traction motor suspension for the substitution of a spring suspension that has wearable parts; 3) organize a search for solutions for perspective diesel locomotives that are intended to operate on the Eastern polygon. For diesel locomotives with 1050 mm wheels the authors propose designs of a frame support traction drive equipped with flat rubber-metal elements and a traction drive with rigid support of an electric traction motor on wheel centres by the use of domestic bearings. Instead of the spring suspension the authors recommend to use suspensions with flat rubber elements and spherical rubber-metal mounting, which will provide interoperability of bogies with modified and unmodified electric traction motors. For perspective diesel locomotives with 1250 mm wheels the authors propose designs of two-axle bogies equipped with high-torque commutator motors and a traction drive with a frame support suspension of a traction motor and an axial gearbox.

The problem is considered in order to find new solutions to improve the grip of locomotive wheels with rails to increase their traction properties. As a result of the analysis, the possibility is found to increase the traction coefficient by improving the dynamic properties of the carriage part, using the phenomenon of self-oscillation of wheel pairs and the impact of a magnetic field on the contact surface of the wheel and rail. For locomotives with two-axle bogies with a wheel diameter of 1250 mm, it is proposed to use a traction drive with an asynchronous traction motor attached to the bogie frame and an axial gearbox, which allows these methods to be implemented with the existing base of bogies. New traction drive designs are proposed for locomotives with a wheel diameter of 1050 mm.

Influence of uneven distribution of coupling mass on locomotive wheel pairs, its tractive power, straight and curved sections of industrial rail tracks. A M Keropyan, L I Kantovich, B V Voronin et al. Abstract. The problems of the friction self-oscillation decrease in a nonlinear system of a locomotive traction drive are considered. It is determined that the self-oscillation amplitude decrease in a locomotive wheel pair during boxing in traction drives with an elastic linkage between an armature of a traction electric motor and gearing can be achieved due to drive damping capacity during impact vibro-damping in an axle reduction gear with a hard driven gear. The self-oscillation amplitude reduction in a wheel pair in the designs of locomotive traction drives with the location of elastic elements between a wheel pair and gearing can be obtained owing to the application of drive inertial masses as an anti-vibrator. On the basis of the carried out investigations, a design variant of a self-oscillation shock absorber of a traction electric motor framework on a reduction gear suspension with an absorber located beyond a wheel-motor unit was offered.