Chapter 5 — Hydraulic Pumps 137
5- 23
Bent-Axis Piston Pumps PISTONS (ANGLED)
OUTLET
ROTATING DRIVE DRIVE SHAFT
MAX ANGLE
DIRECTION OF ROTATION PISTON BLOCK (ANGLED)
INLET
DIRECTION OF FLUID FLOW
MAXIMUM PISTON STROKE — FULL FLOW
REDUCED ANGLE
REDUCED STROKE — REDUCED FLOW
NO ANGLE
NO STROKE — NO FLOW Figure 5-23. Bent-axis piston pumps operate in the same manner as an axial piston pump, but rather than the swash plate being at an angle, the pistons and piston block are at an angle.
5- 24
Radial Piston Pumps HOUSING HIGH-PRESSURE AREA TO OUTLET
PUMP SHAFT
CAM
HOUSING ROTATING INTERNAL CAM
LOW-PRESSURE AREA FROM INLET
CYLINDER
ROTATING PISTON BLOCK OUTLET
PISTON
INLET
ROTATING PISTON
Figure 5-24. Radial piston pumps consist of reciprocating pistons in cylinders and can be classified as cam or rotating piston pumps.