Water as a hydraulic fluid provides a high power density and is considered the cleanest and most useful fluid in the world. It has very good fire resistance and is environmentally friendly. As part of the thesis, we designed a special water hydraulic test rig intended for the development of axial piston pumps with variable displacement. Axial piston pumps are used for high flow rates and pressures, and also for small torques and high rotational frequencies. The pump is driven by the motor, which transmits the torque through the shaft to the drum, in which the pistons are located. At the end of each piston there is a sliding shoe that slides on the swash plate with which the piston moves in the direction of the shaft.
We focused on two tribological pairs - the contact of the piston with the drum and the contact of the sliding shoe with the swash plate. The tested piston slides in a bushing, which is interchangeable and can be made of different materials. The main objective was to observe the wear of the bushing and the swash plate, as well as the leakage of hydraulic fluid on both tribological pairs. We performed strength calculations to prove that the design of the test rig can support the given load. Depending on the rotation frequency, we calculated the speed and movement of piston, hydraulic power, torque, flow and displacement in each flow channel of the test rig at each angle of the swash plate.
|
