Page 455 - Mechatronics with Experiments

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JWST499-Cetinkunt
JWST499-c07
ELECTROHYDRAULIC MOTION CONTROL SYSTEMS 441
Outlet port
Maximum
displacement Slipper Displacement
setting Piston control

Cylinder block
Control journal Stroke ring
Retaining ring
Inlet port
FIGURE 7.29: Radial piston pump: cross-section. Reproduced with permission from Eaton.
Copyright 1999 Eaton. All Rights Reserved.

Typical radial piston pumps provide output pressure up to about 350 bar, and flow rates of
200 lpm.

(iv) Axial Piston Pumps Axial piston pumps are the most widely used pump types
in mobile hydraulic applications. There are two major types:

inline piston pumps (Figure 7.30),
bent-axis axial piston pump (Figure 7.31).

Swash plate
control unit

Pilot valve for
control piston

Outlet chamber

Input shaft

Swash plate
Cylinder Inlet chamber
FIGURE 7.30: Inline-axis axial piston pump (variable displacement) cross-sectional view.