A starter motor is a device for starting internal combustion engines. In some tests, there are often requirements for extra load on the motor during start-up. For this purpose, it is necessary to provide an additional braking torque on the motor shaft. This torque can be provided by a brake that can work on different principles. As part of the work we presented three braking concepts, evaluated them according to the VDI 2225 method and selected the most appropriate one. The most appropriate braking concept uses the torque required to drive a pump that pushes oil under pressure through a proportional safety valve. This allows setting the braking torque. At the beginning, we studied the conditions during start-up and the requirements for additional loading. We then studied the selected concept in detail, selected the components and constructed it. We created a hydraulic scheme and a 3D model of the entire brake. To ensure correct operation, we performed pressure measurements in the pressure line depending on the rotation of the main shaft of the pump. We have shown that for the correct operation of the brake, it is necessary to use a hydraulic accumulator, which provides the braking torque from the very first moment of rotation. At the end, we created a simulation of the braking and gave suggestions for further work.
|
