Abstract
The paper deals with traffic safety in railway transport. The influence of the work of the braking system friction elements on braking performance is evaluated. The temperature in the pad-on-disc or pad-on-wheels contact has significant influence on the friction brake elements. Important factor in achieving maximum braking power is the control of the temperature in the contact. The analysis of methods and designs for heat dissipation from contact friction elements is carried out. The effect of ventilation channels of disc brakes on the vehicle running resistance is considered. The technical solutions for temperature control in friction elements during braking are proposed. Based on the analysis, an innovative solution of the brake disc was proposed. The proposed solution will reduce the wear of the friction surfaces, will significantly simplify the technological process of the brake disc replacement, will reduce the probability of cracks in the depth of the disc and will increase the reliability of its operation.
Highlights
The efficiency of friction elements of the rolling stock brake system has a significant impact on traffic safety and possibility of speed increase
Effective braking depends on the friction coefficient, which is influenced by temperature changes in the friction contact
An effective braking system is an important part of safety and resource saving in rolling stock operation
Summary
The efficiency of friction elements of the rolling stock brake system has a significant impact on traffic safety and possibility of speed increase. Kinetic energy of the train is transformed into other forms of energy, mostly to heat This process is accompanied by increase in the friction element temperature. Due to the friction forces wheel and brake pads contact is heated up during braking This adversely affects the surface of the wheel rolling (the temperature in the contact zone reaches 700 - 800 0C) [2 and 8]. A temperature field with a significant gradient is an indispensable overwhelming physical phenomenon of mechanical energy into heat conversion. This leads to decline in friction and strength properties due to structural changes in materials. Thermal deformation in the rib area causes the waviness or roughness of the friction disc surface, thereby increasing the pressure on the friction linings and creating local temperature spots on the friction disc surface [10]
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