Series - REXROTH A2FO Series Manual

4/20 Bosch Rexroth AG | Mobile Hydraulics
Technical Data
Case drain pressure
Shaft seal ring FKM (fluor-caoutchouc)
The lower the speed and the case drain pressure the higher the life
expectation of the shaft seal ring. The values shown in the diagram
are permissible loads of the seal ring and shall not be exceeded.
With constant case pressure in the range of the max. permissible
case pressure a reduction of the life expectancy of the seal ring will
result.
For a short period (t < 5 min.) for the sizes 5...200 pressure loads up
to 5 bar independent from rotational speeds are permissible.
Sizes 10...200
10
9
8
7
6
5
sizes 80, 90
4
sizes 107, 125
3
sizes 160, 180
2
size 200
1
0 1000 2000 3000
Sizes 250...1000
4
3,5
3
2,5
sizes 500
2
sizes 710
1,5
size 1000
1
0 250 500 750
speed n (rpm)
Shaft seal ring NBR (nitril-caoutchouc) sizes 5...200
For seal rings of NBR 33% reduced values for the max. permissible
housing pressure p are to be considered compared with seals
abs.max.
of FKM.
Special operation conditions may require limitations of these values.
Note:
- maximum permissible pump speeds are given in the table on page 5
- max. perm. casing pressure p
abs. max
- 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
4000 5000 6000 7000 8000
speed n (rpm)
size 250
size 355
1000 1250 1500 1750 2000
___ 10 bar (sizes 5...200)
___ 4 bar (sizes 250...1000)
Working pressure range inlet
Minimum pressure at port S
p
abs. min _______________________________________________________________
Working pressure range outlet
Maximum pressure at port A or B
(Pressure data to DIN 24312)
Size 5 Shaft end B
Nominal pressure p 210 bar
N
Peak pressure p 250 bar
max
1
Sizes 10...200 ) Shaft end A, Z
Nominal pressure p 400 bar
N
Peak pressure p 450 bar
max
1
) Attention: shaft end Z and P with drives of radial force loads at
the drive shaft (pinion V-belt drives) necessitate reduction of the
nominal pressure to p = 315 bar.
N
2) shaft end Z for size 56: p = 350 bar, p
N
Sizes 250...1000
Nominal pressure p 350 bar
N
Peak pressure p 400 bar
max
With pulsating loads above 315 bar we recommend using the model
with splined shaft, standard version A (sizes 10...200) or with splined
shaft Z (sizes 250...1000).
Long-Life bearings (L) (sizes 250...1000)
(for high life expectancy and use of HF-fluids)
The outer dimensions of the axial piston pumps 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.
Temperature range of the shaft seal ring
The FKM shaft seal is admissible for a temperature range from
-25°C to +115°C. For applications below -25°C a NBR shaft seal is
necessary (admissible temperature range -40°C to +90°C) (special
design for sizes 250...1000).
Bearing flushing
For sizes 250...1000 bearing and housing flushing is possible through
port U.
Flushing flow (recommendation)
Size 250 355
q (L/min) 10 16
flush
A2FO | RE 91 401/09.00
0,8 bar
Shaft end C
315 bar
350 bar
2
) Shaft end B, P
350 bar
400 bar
= 400 bar
max
500 710 1000
20 25 25