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Simulation of dynamic phenomena in a high pressure variable displacement axial piston hydraulic pump

Zawistowski Tomasz, Kleiber Michał

Computer Assisted Methods in Engineering and Science

2018

Vol. 25, no. 2-3

89--120

Substituting a valve plate-based commutation unit with a hydrostatic-load-free commutation bushingcontrollable with a signal of negligible power, that could be applied in constant and variable displacementpumps introduced a different approach to the design of commutation units in multi-piston axial hydraulicpumps.Conducted research showed that valve plate-based commutator is responsible for over 50% energy loss.The new idea assumed a stationary cylinder block and the replacement of the valve plate with a cam-driven commutation unit that would be totally unloaded hydrostatically. That eliminated main source ofmechanical losses as well as a flow resistance loss. Additionally, the dead volume was significantly reduced,which helped to reduce the pump noise level and resulted in a great decrease in power needed to controlthe pump displacement. That allowed to eliminate a servomechanism and the direct control of the pumpdisplacement with a low power element. However, the new design presented a challenge in the form ofpressure peaks occurring in the working chamber, which were difficult to eliminate. This article presentsattempts to solve problems connected with those dynamic phenomena.