Desenvolvimento de uma bancada instrumentada para a verificação do ajuste de Stroke em um sistema de freio a disco pneumático

Abstract

The braking system is one of the most important part of a vehicle, bringing safety for the driver and the passengers. Among the components of a brake system there is the brake pads which contains friction material that is responsible for stopping the car. The importance of this component requires it to pass for a series of tests to guarantee the safety, quality, efficiency and reliability of the system. One way to test the braking system, in the industry or laboratory, is to use an inertial dynamometer, however the costs are high. Therefore, one may conclude the necessity of finding an alternative that optimizes and guarantee reliable results through the inclusion of a test procedure before the tests on the dynamometer. Thus, the aim of this work is to develop an instrumented bench for the verification of the stroke adjustment in the pneumatic braking system, to carry out tests before entering the dynamometers. Thus, the aim of this work is to develop an instrumented bench for the verification of the stroke adjustment in the pneumatic braking system, to carry out tests before entering the dynamometers. The developed bench has a static axis with two manually operated valves for air inlet and outlet, pressure data collection system and displacement of the stroke adjustment. Tests were carried out on the bench and on the dynamometer, using a non-deformable block, thus being able to validate the data acquisition system. The bench was also used to carry out several tests with friction materials of different compressibility in addition to providing learning and better understanding of the operation of a pneumatic braking system. As result, (equivalent) comparative data between the bench and the dynamometers were obtained through the tests graphs, standard deviation, coefficient of variation and hysteresis. In conclusion, a pneumatic brake test bench was obtained, which allows the adjustment of the stroke trough the data acquisition system