Axial piston pumps are positive displacement units that utilize reciprocating pistons and rotating components to provide fluid power in hydraulic systems. One of the most common and versatile axial piston pump designs is the series PV developed by Rexroth. The series PV axial piston pump provides high power density, responsive controls, and flexibility making it suitable for a wide range of industrial applications. Below we’ll explore the key features and operating principles of the Rexroth axial piston pump series PV.
Introduction to Axial Piston Pumps
Axial piston pumps utilize cylinders arranged in a circular pattern within a rotating barrel or drive plate. As the assembly rotates, the pistons reciprocate in their bores driving fluid flow. The displacement per revolution depends on piston quantity, size and stroke length. These pumps are capable of high pressures, reversible flow and variable displacement using mechanical or electronic control. Axial piston pumps are commonly used where high power density, speed response and adjustable flow/pressure are needed.
Series PV Axial Piston Pump Overview
The Rexroth series PV is an adjustable bent-axis axial piston unit that provides precise control for high pressure hydraulic power applications. It features a slanting yoke design allowing for a compact, versatile pump in either fixed or variable configurations from 16 to 250 cm3/rev. Models operate at speeds up to 2100 RPM and pressures up to 5000 PSI.
The PV pump’s pistons ride against a swash or control plate that pivots to vary piston stroke. The pressure balanced control pistons actuate the swashplate according to electronic command or mechanical feedback. This tilting swashplate allows smooth capacity adjustment even at high operating speeds.
The pump housing contains intake and discharge ports as well as passages for slipper retraction that enables self-priming and dry run capabilities. Bearings support the drive shaft while allowing minor misalignment. Special noise damping covers are also available for quiet operation.
Series PV Design Elements
Some of the notable design elements of the Rexroth series PV axial piston pump include:
- Slanted Axis Swashplate – Provides an angled piston bore that reduces size while optimizing piston contact. Offers displacement variability.
- Pressure Balanced Control Pistons – Controls swashplate angle and displacement with minimal hydraulic force imbalance.
- Non-Contacting Swashplate Shoes – Improves efficiency by using shoes with hydrostatic bearings to the swashplate.
- Cylindrical Pistons – Increases strength compared to slipper pistons and enhances efficiency.
- Retracting Slipper Mechanism – Allows pump self-priming along with extended dry running ability.
- Dampening Covers – Significantly reduces noise generation and transmission.
Advantages of the Series PV Axial Piston Pumps
The Rexroth series PV axial piston pump provides numerous functional benefits including:
- Compact standardized design with 16 to 250 cm3/rev sizes
- High power density with up to 22 HP in a small mount
- Pressures up to 5000 PSI and speeds reaching 2100 RPM
- Stepless capacity modulation from zero to maximum displacement
- Fast smooth response with full stroke change in 50-150 milliseconds
- Reversible flow capability with change in direction within 150 ms
- Capable of dry running and self-priming
- High overall efficiency up to 92%
- Long service life exceeding 20,000 сағат
- Flange mounting with optional noise dampening covers
- Variety of controls including electronic, гидравликалық, and mechanical
Series PV Applications
The Rexroth series PV axial piston pump serves numerous hydraulic power applications including:
- Plastic injection molding machines
- Metal forming presses
- Material handling equipment
- Machining centers and CNC machines
- Marine hydraulics and offshore equipment
- Oil field equipment
- Mining machinery
- Alternative energy systems
- Automation machine actuators
- Test rig hydraulics
Rexroth’s series PV combines versatile modular design with excellent efficiency and controllability. Obtaining the specific operation manual provides even greater insights into properly selecting, installing, operating and maintaining these axial piston pumps. The Rexroth PV series of pumps deliver premium performance and longevity for critical industrial hydraulic systems.