"The Dynamics of Leakage in Bent Axis Units Without Timing Gear"
: BATH/ASME 2016 Symposium on Fluid Power and Motion Control September 7?9, 2016 Bath, UK, 11-2016, ISBN: 978-0-7918-5006-0
The Dynamics of Leakage in Bent Axis Units Without Timing Gear
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BATH/ASME 2016 Symposium on Fluid Power and Motion Control September 7?9, 2016 Bath, UK
Bent axis hydraulic pumps and motors are extremely popular due to their high efficiency and large speed range. A number of different concepts exist with respect to kinematic restraints on the cylinder barrel motion. Some manufacturers rely upon a timing gear for precise synchronization of the shaft and barrel speeds while other companies have successfully introduced bent axis units without such a mechanism. The paper analyses the dynamics of bent axis machines with tapered pistons driving the cylinder barrel. A rotation of the pistons inside the corresponding bores is proposed to result in changing cylinder chamber to case drain leakages. The reported phenomenon is shown to have a significant effect on the low frequency part of pressure and flow pulsations. In this way, frequency components far below the fundamental frequency associated with the shaft revolution are generated.