What is Bent Axial Piston Pump | Working, Construction, Material

Definition

“Bent Axial Piston Pump”

If the axis of the cylinder block is made to form an angle with the axis of the drive shaft to obtain reciprocating movement of pistons for pumping of oil. It is called as bent axis axial piston pump.
When cylinder block is inclined at angle with respect to drive shaft, it will produce to and fro motion required for pumping of oil. The cylinder block angle can be charged to vary the stroke and flow rate of the pumps.

Element of Bent axial piston pump

• The bent axis piston have number of elements. The major elements of bent axis piston pump are pistons, connecting rods,
  universal joint, flanges, input shaft, output shaft, bearings and motor.

Construction and working

• Bent axis pump consists of a cylinder block, pistons, universal link which keys block to drive shaft, shaft bearings and drive shaft.
• The cylinder block is mounted at an angle with the drive shaft with inlet and outlet port.
• The drive shaft is connected to the electric motor with the help of coupling.
• As the drive shaft rotates it causes rotation of the cylinder block. Thus pistons inside the box also get to and fro motion.
  The rotating cylinder block bores are open to inlet and outlet slots of the valve plate which is fixed.
• During rotation of cylinder block, the pistons are pulled to suck the oil through inlet and get pushed during next rotation for pumping of oil through discharge port.
• The angle of cylinder block may be fixed or variable. It is maintained with the help of yoke and actuating control mechanism. The maximum angle is generally kept upto 30degree.
• To reduce function between cylinder block and valve plate, an oil film is needed.
• Bent axis pump can generate pressure upto 700 bar with flow rate maximum upto 800 liters/min.

Materials

The materials used to design the piston-pumps mainly depend on the application of a pump. The casing and cylinder materials must have sufficient strength as well as they have to hold up adjacent to the operating environment conditions.
Some type of materials used in this pumps are –

• Cast iron offers high tensile power, robustness, and scratch resistance equivalent to high force ratings.
• Plastic materials are cheap as well as offer a wide resistance toward rust as well as chemical attack.
• Stainless steel alloys and steel give safety.
• Other types of materials used to design the pump mainly include aluminum, brass, bronze, ceramics, and nickel-alloy.

Application

Axial piston pumps are used to power the hydraulic systems of jet aircraft, being gear-driven off of the turbine engine’s main shaft, The system used on the F-14 used a 9-piston pump that produced a standard system operating pressure of 3000 psi and a maximum flow of 84 gallons per minut.

Advantages

• The range of pressure is wide and the pressure can be controlled without an impact on the rate of flow.
• Piston pumps have a continuous rate of discharge.
• Force can be managed without moving flow rate of pump.
• The rate of flows and Pressure changes has a small outcome on the act.

FAQ

• What is bent axis axial piston pump?
  If the axis of the cylinder block is made to form an angle with the axis of the drive shaft to obtain reciprocating movement of pistons for pumping of oil. It is called as bent axis axial piston pump.
• What is a axial piston pump used for?
  Axial piston pumps are used to power the hydraulic systems of jet aircraft etc.
• What is the difference between axial piston pump and radial piston pump?
  A radial pump has the pistons arranged radially in a cylinder block while the pistons in the axial units are parallel to each other and to the axis of the cylinder block. Axial piston pumps may be further divided into in-line (swash plate) and bent-axis types.
• What is volumetric efficiency of pump?
  Volumetric efficiency is the actual amount of fluid flowing through a pump, rather than its theoretical maximum.
• What is the pressure of Bent axis axial piston pump ?
  Bent axis pump can generate pressure upto 700 bar with flow rate maximum upto 800 liters/min.