Eaton has updated its open circuit piston pump portfolio with a series of new controls that enhance performance.
Electronic displacement control (EDC) has now been included across the entire X20 range, while pressure/flow control has been improved and a new hydro-mechanical torque control for the 620 Series pumps has been added.
The inclusion of these new and updated controls enables the portfolio of pumps to integrate more easily into sophisticated machine control systems, maximizing efficiency with less wasted energy.
John Taylor, EMEA product manager for hydraulics at Eaton, said, “These new options for the X20 range will greatly enhance the ability to be integrated into many hydraulic systems, from simple load sense to sophisticated electrohydraulic and digital systems that offer dynamic machine control–helping machine designers improve equipment accuracy and performance.”
Flexibility and efficiency
The EDC varies the swash angle of the electric current proportionally, providing greater flexibility in machine design, efficiency in operation and control over pump output flow. It is available in two different configurations for all displacements from 28cm³ to 98cm³. This permits the EDC to be used in applications such as cooling fan drives or concrete machinery, where hydraulic flow must be maintained even in the event of an electrical failure, ensuring safe and stabile operations on the field.
The X20 electronic proportional pressure control limits outlet pressure proportionally to signal current and can be used as an alternative to hydro-mechanical control or indeed alongside the EDC to provide independent control of both pressure and flow. As with EDC, two versions are available, proportional and inverse proportional.
The new hydro mechanical torque control feature, available on the 74cm³ and 98cm³ displacements, limits the torque required by the pump based on the setting. By limiting the peak input torque demand across the range or pressures, speeds and temperatures, the pump prevents engine stalling while maximizing the use of the engine power. In this way, it is possible to downsize the engine, reducing fuel consumption in applications such as telehandlers, excavators and forestry equipment. The control has low hysteresis and a true hyperbolic characteristic for optimal performance.
As well as improved accuracy over two spring designs, this new control also benefits from having one single adjusting screw to set the torque, which is adjustable with the hydraulic system running.
Available for 220 and 420 frame sizes, all X20 load sense and pressure compensated pumps are now available with American Bureau of Shipping (ABS) Marine certification, permitting their use on marine power systems for steering and propulsion.