Abstract
The problem of calculation and forecasting main parameters of aerosol lubricators designed for applying lubricants on angled to the horizon friction surfaces e.g. the lateral surfaces of a rail and a wheel flange of railway rolling stock is solved in the article. The main parameters of lubricators being considered in the article are compressed air supply, the geometry of a spray nozzle and the boundary thickness of a lubricant layer applied to the friction surface where there is no creep of a lubricant under the action of gravity. A structural model of application and retention of a lubricant on a friction surface has been proposed. A mathematical model to calculate main parameters of aerosol lubricators has been developed. The model establishes the connection between the geometry of lubricated friction surfaces, physico-chemical properties of lubricants and the diameter of nozzle aperture and the compressed air supply. The example of calculation of the boundary thickness of a lubricant layer applied to the friction surface under the condition of the absence of its creeping under the action of gravity has been presented in the article. The article presents the results of experimental studies the process of aerosol application of a lubricant to the friction surface.
Highlights
One of the promising methods of preventing wear and tear of rails and wheels of railways which is being developed actively nowadays is the application of lubrication [1,2,3,4,5]
According to the method of application of lubricants, two types of lubricants can be distinguished which are widely used on railways, namely: lubricators with direct-acting nozzles and aerosol lubricators in which liquid lubricant is applied to the friction surface in the form of aerosol that is produced by special nozzles while supplying a lubricant and compressed air simultaneously
The results of the calculations of the condition under which a lubricant drop is rolling down the friction surface and boundary thickness of a drop as the function of air supply are presented in Fig. 5 and Fig. 6
Summary
One of the promising methods of preventing wear and tear of rails and wheels of railways which is being developed actively nowadays is the application of lubrication [1,2,3,4,5] This method is being investigated and introduced in many countries of the world. According to the method of application of lubricants, two types of lubricants can be distinguished which are widely used on railways, namely: lubricators with direct-acting (hydrodynamic) nozzles and aerosol lubricators in which liquid lubricant (oil) is applied to the friction surface in the form of aerosol that is produced by special nozzles while supplying a lubricant and compressed air simultaneously The latter is more economical from the point of view of a lubricant and power consumption, but today theoretical researches of the process of aerosol application are unavailable. These investigations would make it possible to calculate the main parameters of lubricators: a lubricant and compressed air consumption
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