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International Journal of Automotive Technology > Volume 21(2); 2020 > Article
International Journal of Automotive Technology 2020;21(2): 319-328.
doi: https://doi.org/10.1007/s12239-020-0030-y
EFFECT OF HOLES ON BRAKE-BLEEDING PERFORMANCE IMPROVEMENT IN THE EPB CALIPER
Jang-oh Mo
Mando Corporation
PDF Links Corresponding Author.  Jang-oh Mo , Email. jangoh.mo@halla.com
ABSTRACT
Brake-bleeding is the process of removing air bubbles present on hydraulic brake systems. In particular, the existence of air content within the EPB caliper deteriorates bleeding performance, causing a high-level compressibility of the brake fluid. This paper presents numerical and experimental investigations of the effect of holes on brake-bleeding performance improvement for three different nut-spindle models included in the driving-part model of the EPB caliper. In the present paper, compressible brake-fluid simulations with pressure rise and drop ranging in pressure from 0 to 100 bar are modelled with a transient numerical approach utilizing a three-phase mixture model and standard k-ω turbulence model. The experimental verification of the effect of the holes with a constant 2 mm diameter, determined from the simulation results, was conducted using a standard test device at Mando Corporation. In conclusion, the experimental results prove that the effect of the holes has considerable impact on the performance improvement.
Key Words: Effect of holes, Electric parking brake (EPB) caliper, Trapped air, Brake-bleeding performance
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