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VT-Machine of Axial Compact design
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In 1966 Sundstrand Corp proposed concept , patent GB1140167A , of the axial piston machine with compact piston, while Poclain Hydraulics, proposed improvement in 2004, patent EP1564370A1, regarding synchronization mechanism .
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Both patents describes machine with straight cylinder bores. that limits maximal swash plate angle; due to the two mechanical interferences. First one is between piston rod and straight cylinder bore. Second one is between shaft and the swash plate.. Mentioned drawback can be seen as the obstacle fort the wider spread of this technology, even this technology has potential for improved mechanical efficiency. comparing to existing axial piston units.
Main characteristics of the standard axial piston versus MAC state of the art
Main characteristics of the standard axial piston versus advanced MAC
New, advanced concept of the MAC machine is proposed with inclined cylinder bores in order to push the limits relating to mechanical interferences. According to CAD analysis 21° can be archived resulting in decreased €/cc and increased efficiency.. but it has to be tested experimentally. Additional advantage of the new concept is hydrostatic lubrification between cylinder and piston that will further reduce friction i.e. increased mechanical efficiency:
Mentioned advancements are result of the in depth analysis using CAD SOLIDWORKS, Excel for 2D analysis and Matlab for 3D analysis, as well as MATLAB....
... quest for the more energy efficient hydrostatic machines, more cost effective machines, more sound acceptable machines isn't stopped and some new concepts are under development ...