منتخب ڪريو صفحو

Axial piston variable pumps are commonly used in hydraulic systems to provide precise control of fluid pressure and flow. In this post, we’ll explain how these pumps work in plain language so they’re easy to grasp.

محوري پستن متغير پمپ A4vg

How Axial Piston Variable Pump A4VG Work?

Axial piston pumps use a rotating cylinder block containing several pistons to pressurize fluid. As the cylinder block rotates, the pistons stroke in and out to draw in fluid then push it out under pressure.

The A4VG pump has a swash plate that can be tilted at different angles to vary the stroke length of the pistons, changing the pump’s displacement and thus its output. At maximum tilt, the pistons stroke fully and the pump produces maximum flow and pressure.

When the swash plate is leveled, the pump is at minimum displacement and output. This variable displacement design allows axial piston pumps to match their output to the hydraulic system’s needs.

محوري پستن متغير پمپ A4vg

Key Features For محوري پستن متغير پمپ A4vg

Some key features of axial piston variable pumps like the Bosch Rexroth A4VG include:

  • High efficiencyBecause fluid enters and exits the pump in a continuous flow, axial piston pumps achieve high volumetric and mechanical efficiency.
  • Good controllabilityThe swash plate mechanism provides precise displacement control and fast response to changes in demand.
  • Quiet operationAxial piston pumps produce less noise than other pump types.
  • Compact designThe axial layout allows for a smaller footprint than comparable radial piston pumps.
  • Long service lifeThe design offers durability, with minimal wear between rotating and stationary parts.

Axial Piston Variable PumpVariants And Specifications

Axial piston variable pumps come in a range of variants based on displacement, pressure and hydraulic flow rate. The Bosch Rexroth A4VG series includes models with:

  • Maximum displacements from 31 to 280 في انقلاب (cc/rev)
  • Maximum operating pressures from 207 to 344 بار (3,000 to 5,000 psi)
  • Flow rates ranging from 16 to 700 liters per minute
  • Speeds up to 4,500 آر پي ايم
  • Integral relief valves to protect the system from overpressure

Not all axial piston pumps are variable displacement. Some designs have a fixed displacement to provide continuous high flow at a set pressure. بهرحال, variable displacement pumps are more commonly used due to their efficiency and control.

Benefits Over Other Pump Types

Compared to gear pumps or vane pumps, axial piston variable pumps offer several advantages:

  • Higher pressure capabilityThey can produce operating pressures up to 5,000 psi or more.
  • Better efficiencyAxial piston pumps achieve volumetric efficiencies around 95%, while gear pumps are around 85%.
  • More precise controlThe swash plate provides accurate displacement adjustment for varying hydraulic demand.
  • Longer lifeThere is less contact between rotating and stationary parts, reducing wear over time.
  • Quieter operationThe linear piston motion creates less noise than oblique gear or vane movements.