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The floating cup principle is a new axial piston concept for hydrostatic machines. It features a high number of pistons, arranged in a double ring, back-to-back configuration. Furthermore the pistons are locked onto a central rotor and each piston has its own cuplike cylinder. These ‘cups’ are floating on and supported by a barrel plate. The pistons have a ball shaped crown, which is sealing directly on the cylinder without a piston ring. A first prototype of the new pump has been built and tested. For comparison a state-of-the-art slipper type pump and a bent axis pump (both constant displacement, 28 cc/rev) have been tested as well. The steady-state performance tests have proven the high efficiency of the floating cup principle. The low speed tests, during which the pumps are tested as a motor, have confirmed the low friction losses and high starting torque of the floating cup principle. Furthermore the high number of pistons strongly reduces the torque variations.

Through the development of the Innas Hydraulic Transformer, a hydraulic driveline called Common Pressure Rail (CPR) becomes possible. The CPR system profits from considerable advantages over conventional hydraulic drivelines in terms of costs, controllability and flexibility. In CPR systems all cylinders and motors are connected to a single common rail, delivering the same pressure to all connected devices. The control of functions is realized using innas hydraulic transformers (IHT). IHTs enable local control of cylinders or motors without throttling energy. Integrating an IHT with a cylinder and closed loop control creates a Variable Displacement Cylinder or VDC. These devices enable modular design of mobile machinery. Design of flexible machines becomes possible and complex machine tasks are easy to automate without increasing the complexity of the machine.