Page 157 - Fluid Power Engineering

Hydraulic Pumps 131

2 Axial piston pump
(swash plate type)
The pistons rotate with the
cylinder block, supported by
the swash plate. The swash
plate angle determines the
piston stroke.
V = 2–600 cc
g
n = 500–4500 rpm
p = 400 bar
max
V = π d Dz tan α
2
g 4
3 Axial piston pump
(swash plate type, inclined
pistons)
V = 8–300 cc
g
n = 500–3500 rpm
p = 350 bar
max
π
V = d D z sin( α)
2
g
8
⎧ 1 1 ⎫
× ⎨ + ⎬
+ )
− )
⎩ cos(ϕα cos(ϕα ⎭
4 Axial piston pump
(rotating swash plate type,
wobble plate)
p = 630 bar
max
π
V = d Dz tanα
2
g 4
5 Radial piston pump
(eccentric cam ring)
The pistons rotate within
the rigid cam ring. The
eccentricity, e, causes the
radial motion of the pistons.
V = 0.5–20 cc
g
n = 500–2000 rpm
p = 400 bar
max π
V = d ez
2
g 2 k

(Continued)