Bucher AX Piston Pump and AXM Piston Motor

Bucher's AX Piston Pump and AXM Piston Motor are based on a concept which balances internal forces by having two rotating barrel plates facing each other and each having 12 pistons; it will be introduced at CONEXPO 2020.

The AXFP fixed displacement piston pump (pictured) and AXFM motor are available in multiple sizes with displacements from 18 cc/rev up to 76 cc/rev.
The AXFP fixed displacement piston pump (pictured) and AXFM motor are available in multiple sizes with displacements from 18 cc/rev up to 76 cc/rev.
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Bucher Hydraulics is introducing the AX piston pump and AXM piston motor which overcome the limitations of current piston technology.

  • Offers better efficiency, excellent dynamics, low noise, and low minimum speed at high output torque
  • Based on a concept which works on the principle of balancing internal forces by having two rotating barrel plates facing each other and each having 12 pistons
  • Achieves high power density and limits axial forces, requiring only a light bearing to absorb them
  • Available in displacements of 18-76 cc/rev, with an immediate target of extending the range up to 115 cc/rev
  • Well suited for electric and hybrid machines due to ability to turn in both directions, as well as features such as high volumetric and mechanical efficiency, low-pressure ripple, and minimum permissible speed of 2-3 rpm
  • Standard versions can reach working pressure of 450 bar
  • Start efficiency of 99% in the low-speed range compared to 60-65% of a conventional axial-piston unit, enabling precise and accurate movements
  • Capable of running very slowly under high load and pressure
  • High power density, high-working pressure, and low permissible speed make motor a good alternative to applying a gear motor
  • Minimum speed of 2 RPM at high pressure

The large, non-compensated forces in bent-axis motors need to be absorbed by an extra-large ball or roller bearings. This increases the space required in the machine and makes integration more difficult.The large, non-compensated forces in bent-axis motors need to be absorbed by an extra-large ball or roller bearings. This increases the space required in the machine and makes integration more difficult.

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