REXROTH AA2FM Reparaturanleitung Seite 5

Fixed Displacement Motor AA2FM (A2FM)
Technical Data
Case drain pressure
The lower the speed and the case drain pressure the higher the life
expectation of the shaft seal ring.
Shaft seal ring FPM (fluor-caoutchouc)
The values shown in the diagram are permissible loads of the seal
ring and shall not be exceeded.
At stationary pressure loads in the range of the max. admissible
leakage pressure a reduction of the life experience of the seal ring
will result.
For a short period (t < 5 min.) are for the sizes 10...200 pressure
loads up to 75 psi (5 bar) permissible, independent from rotational
speeds.
Sizes 10...200
bar
10
9
8
7
6
5
sizes 107,125
4
sizes 160,180
3
size 200
2
1
0 1000 2000 3000
Sizes 250...1000
bar
4
3,5
3
2,5
size 500
size 710
2
1,5
size 1000
1
0 500 1000
Special operation conditions may require limitations of these
values.
Note:
- maximum permissible motor speeds are given in the table on
page 7
- max. perm. housing pressure p
- the pressure in the housing must be the same as or greater
than the external pressure on the shaft seal.
sizes 10,12,16
sizes 23,28,32
size 45
sizes 56,63
sizes 80,90
4000 5000 6000 7000 8000
speed n (rpm)
size 250
size 355
1500 2000 2500 3000
speed n (rpm)
145 psi / 10bar (sizes 5...200)
abs. max
60 psi / 4 bar (sizes 250...1000)
Flushing valve
In order to prevent excessive heat build-up in closed circuit
operation, it is possible to fit a flushing valve (built into the port
plate). Two such valves are available:
- an Integrated flushing valve (built into the port plate) (sizes 23...90)
- a built-on flushing and boost pressure relief valve (sizes 45...180, 250)
Integrated flushing valve (6)
- switching pressure p
starting pressure of an unloaded motor).
- closed in centre position ( p < 115 psi / 8 bar).
Sizes 23-32 45-63 80-90
Flushing gpm 0.66
volume L/min
psi
Values given for low pressure
p = 365 psi (25 bar)
140
Built-on flushing and boost pressure relief valve (7)
120
This valve is built on to the fixed displacement motor. It must then be
noted that only a port plate with ports at side is then available
100
(port plate 52).
The flushing and boost pressure relief valve has a fixed setting of
80
230 psi / 16 bar (the setting of the primary boost pressure relief
valve must be noted) and is used to safeguard the minimum boost
60
pressure. A fixed flow of fluid is taken via an orifice from the low
pressure side of the circuit and fed into the motor housing. This flow
40
is then passed back to reservoir with the case drain fluid. Fluid thus
removed from the closed circuit must be made up by means of the
20
boost pump.
15
Different orifice sizes may be used to select varying flows of
flushing fluid.
Flows (at low pressure p = 365 psi / 25 bar) *
Size Flow
psi
60
45, 56, 63 0.93 gpm (3,5 L/min)
80, 90 1.32 gpm (5 L/min)
50
107, 125 2.11 gpm (8 L/min)
160, 180 2.64 gpm (10 L/min)
40
250 2.64 gpm (10 L/min)
* Standard flushing volumes (for
sizes 45...180 flushing volumes
30
of 0.93-2.64 gpm / 3,5 - 10 L/min
can be supplied. If a flushing
20 volume different from the
standard flushing volume is
15
required, please indicate the
requested orifice in clear text
when ordering).
Long-Life bearings (L) (sizes 250...1000)
(for high life expectancy and use of HF-fluids)
The outer dimensions of the axial piston motors are identical to
standard design (without long life bearings). The change from
standard design to long life bearing system is possible.
We recommend to apply bearing flushing at port U.
Bearing flushing
For sizes 250...1000 bearing and housing flushing is possible
through port U.
115 psi / 8 bar (this value is lower than the
T
0.82 1.1
2,5 3,1 4,1
T
1
651766/503.12.01.01
419695/503.12.01.01
419696/503.12.01.01
419697/503.12.01.01
A (B)
T
2
T
B (A)
1
RA 91 001/08.97
A (B)
2
B (A)
Orifice No.
5