Rexroth Bosch HPU article

Rexroth Bosch Group White Paper Article on Designing  HPUs for Hydraulic Systems

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Applications for power units span the spectrum of fractional horsepower requirements to those incorporating drives using 100’s of horsepower. From left: Standard, pre-engineered power unit CytroPac; configurable GoPak power unit; typical custom power unit for industrial use; large, complex custom power unit. New capabilities and power unit designs provide many new options to machine and hydraulic system designers.


Environmental or other application-specific requirements, such as high altitude or required certifications, can drive one-of-a-kind solutions. Well-designed Hydraulic Power Units, whether large custom unit or a compact standard unit (including units built into a machine frame), consider all aspects of an application.


Complexity in applications or specification may require complex control packages nearly the same size as the hydraulic power unit. A well designed and built power unit not only achieves functional criteria but can also be an attractive addition to the production floor. Full-featured, complex hydraulic power units should be designed toward functionality and robustness. A clean design must also consider periodic maintenance and service when needed, for example platforms to contain fluid spills, or easy access for replacement of filters.

7 Considerations

  1. Overall Power and Force Requirements
  2. The Operating Environment and Location
  3. Serviceability / Service Life
  4. Noise
  5. Energy Efficiency
  6. Cost
  7. So What About Industry 4.0 and “The Internet of Things?”


With all of the choices facing an engineer designing or selecting a power unit, the fact is this: Designing a power unit can be daunting. Not only must the successful designer develop a robust solution, one that will be capable of producing the “power” required over a long service-life, he or she must also consider plant-floor environments, safety, regulatory requirements, serviceability and maintenance, noise, energy efficiency, and sometimes even IoT-readiness. All of these considerations can influence the lifetime cost.

You’ll need to consider a partner who can provide support wherever your power unit might end up in operation and who is familiar with the safety requirements. IFP/EHA is your solution partner. Visit our previous blog post: Expertise in Hydraulic Power Units