Moog D-71034 Radial Piston Pump

TECHNICAL DATA
Moog Radial Piston Pump RKP
MULTIPLE ARRANGEMENTS
Additional pumps can be tandem mounted on the radial piston pump, so that all pump stages can be driven by the
same shaft. Radial piston pumps (the same size or smaller than the first pump stage) can be mounted directly.
Other pumps may be added on using adapter flanges for SAE-A, SAE-B or SAE-C respectively. For the maximum
permitted through-drive torque for driving add-on pumps, please refer to the table below.
Adding on RKP, SAE-A, SAE-B or SAE-C Adapters Permissible Through-Drive Torques
Pump stage 1 Pump stage 2 RKP
RKP
Size (cm3/rev)
19
32 45
63 80 100
140
250
19
90 Nm (797 lbf in)
–
–
–
–
– 90 Nm (797 lbf in)
32/45
185 Nm (1,637 lbf in)
185 Nm (1,637 lbf in)
–
–
–
110 Nm (974 lbf in)
185 Nm – (1,637 lbf in)
63/80/100
400 Nm 400 Nm 400 Nm (3,540 lbf in) (3,540 lbf in) (3,540 lbf in)
–
–
110 Nm (974 lbf in)
280 Nm 400 Nm (2,478 lbf in) (3,540 lbf in)
140
400 Nm 400 Nm 400 Nm 620 Nm (3,540 lbf in) (3,540 lbf in) (3,540 lbf in)1) (5,487 lbf in)
–
110 Nm (974 lbf in)
280 Nm 620 Nm (2,478 lbf in) (5,487 lbf in)
250
400 Nm 400 Nm 400 Nm (3,540 lbf in) (3,540 lbf in) (3,540 lbf in)
1,470 Nm 110 Nm (13,009 lbf in) (974 lbf in)
1)
SAE-A
620 Nm (5,487 lbf in)
SAE-B
SAE-C
–
280 Nm 1,300 Nm (2,478 lbf in) (11,505 lbf in)
Special flange for 620 Nm (5,487 lbf in) upon request
The through-drive torque required to drive add-on pumps is determined by reference to the following variables:
V [cm /rev] p [bar] hhm [%] T [Nm] 3
Displacement Pressure Hydro-mechanical efficiency Through-drive torque
Through-drive torque from pump stage 1 to 2:
n V ·p i i T1 = 1.59 · Σ η hmi i=2
Example If we take the following pump combination
RKP 63 + RKP 63 + RKP 32 + AZP 16 280 bar (4,000 psi), 210 bar (3,000 psi),
150 bar (2,176 psi), 50 bar (725 psi), the following considerations apply:
T1 = 1.59 ·
(
V2 · p2 ηhm2
+
V3 · p3 ηhm3
+
V4 · p4 ηhm4
(
T1 = 1.59 · (63 · 210/95 + 32 · 150/93 + 16 · 50/90) Nm T1 = 318 Nm The value 318 Nm (2,814 lbf in) is below the threshold
value of 400 Nm (3,540 lbf in) specified in the above table for mounting an RKP 63 on another RKP 63.
Design of 2nd Through-Drive Torque T2 = 1.59 ·
(
V3 · p3 ηhm3
+
V4 · p4 ηhm4
(
T2 = 1.59 · (32 · 150/93 + 16 · 50/90) Nm T2 = 96 Nm Likewise, the value 96 Nm (850 lbf in) lies below the
relevant threshold value of 400 Nm (3,540 lbf in) for the through-drive from RKP 63 to an RKP 32.
Design of 1st Through-Drive
Design of 3rd Through-Drive Torque
The pressure and flow of the 1st pump stage are irrelevant to the torque transferred by the through-drive. This
torque can be calculated using the above formula.
Similarly, a value of 14 Nm (124 lbf in) is obtained for the torque required to drive the add-on gear pump.
Thus, the through-drives for this pump combination are permissible with the stated pressures.
Rev. K, November 2018
12