PERFORMANCE OF FRICTION PAIRS OF DISC-SHOE BRAKES (IN A WET ENVIRONMENT)
DOI:
https://doi.org/10.18372/0370-2197.4(109).20746Keywords:
vehicle, disc-shoe brake, friction pairs, disc surfaces, wettabilityAbstract
This article examines the effects of water wetting on matte and polished brake disc surfaces when vehicles are moving on wet roads.
Thermokinetic processes occurring in water and humid air surrounding the friction pairs of a disc-and-pad brake, consisting of a disc and a pad, were studied using an SMC-2 friction and wear machine. Patterns of changes in the operating parameters (dynamic friction coefficient, braking torque, and wear) of the pad were established as the disc rotates at 300 min-1 under specific loads of 1.0 and 1.3 MPa and surface temperatures up to 400°C. An analysis of the intensity of changes in the above operating parameters is provided.
The polished and matte surfaces of brake discs, with hot and cold zones, have different areas. Water in these areas exists in both liquid and gaseous states. All of this facilitates electrochemical and chemical reactions on the surface of the disc friction zone. Moisture condensed on the disc friction zone acts as an electrolyte, reducing the wear and friction properties of friction pairs and forming corrosion pits at the interfaces between polished and matte disc surfaces. A mathematical description was developed for full-scale testing of a MAN TGA 26.430 disc-shoe brake on a vehicle under variable thermodynamic parameters of the friction pair's cleaning medium.
Oxygen and hydrogen, released during the decomposition of water during the reactions, promote oxidative processes on the disc friction zone and intensify hydrogen-induced wear on its surface.
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