Sauer Mf21/Mf22/Mf23 Hydraulic Piston Motor
Product Description
Hydraulic Sauer-Sundstrand MF20, MF21, MF22, MF23, MF24, MF25, MF26, MF27 Axial Piston Motor
Closed circuit .
Series 20
Size: 20, 21, 22, 23, 24, 25, 26, 27.
Nominal pressure 210 bars, Maximum pressure 350 bars.
Features
The full-length shaft with a high efficient tapered roller bearing arrangement offers a high loading capacity for external radial forces. Additional motors can be built on. The hydro-mechanical servo displacement control maintains the selected swash plate position and hence motor displacement.
Upon release of the control handle, the swash plate automatically returns to the null position and the flow become zero.
High case pressures can be archived without leakage even at the lowest temperature by using suitable shaft seals. The servo valve arrangement offers the facility to incorporate function regulators and remote control system. Axial piston units are designed for easy servicing, complete dismantling and reassembly can be carried out standard hand tools, and all components or sub-assemblies are replaceable.
Servo Displacement Control (Linear response)
Regular by control handle on the servo valve, the swash plate can be infinitely varied in both direction with the help of the servo system.
The motor displacement resulting from any control handle position can be established using figures (5a - 5c).
The angle of the control handle for stroke initiation and for the final position of the stroke can vary from unit to unit within the range of the tolerance band.
Technical Data
Table of values (theoretical values, without efficiency and tolerances; values rounded)
|
Size
|
Dimension
|
Sauer-Sundstrand MF motor
|
|
MF20
|
MF21
|
MF22
|
MF23
|
MF24
|
MF25
|
MF26
|
MF27
|
|
Max. displacement
|
cm3
|
33,3
|
51,6
|
69,8
|
89,0
|
118,7
|
165,8
|
227,3
|
333,7
|
|
Max. flow
|
dm3min-1
|
119,5
|
159,9
|
196,1
|
230,5
|
278,9
|
348,1
|
429,59
|
557,2
|
|
4
|
6
|
4
|
1
|
4
|
8
|
8
|
|
Charge motor
|
cm3
|
12,3
|
12,3
|
18,03
|
18,03
|
18,8
|
32,8
|
32,8
|
65,5
|
|
Max. pressure
|
MPa
|
35
|
|
Nominal pressure
|
MPa
|
21
|
|
Max. pressure of control
|
MPa
|
3,5
|
|
Charge pressure
|
MPa
|
0,8 - 2,0
|
|
Max. pressure in case
|
MPa
|
0,25 continuous 0,5 intermittent
|
|
Maximum speed +
|
min-1
|
3590
|
3100
|
2810
|
2590
|
2350
|
2100
|
1890
|
1670
|
|
Minimum speed
|
min-1
|
500
|
|
Nominal speed
|
min-1
|
1500
|
Kinematic viscosity range of working fluid
- starting
- operating
- optimum
|
mm2s-1
|
1000
12 - 600
25 - 35
|
|
Kind of working fluid
|
|
mineral oil
|
|
Operating temperature
|
oC
|
- 40 to + 50
|
|
Max. temperature of working fluid in tank
|
oC
|
80
|
|
Purity of working fluid
|
µm
|
10
|
|
Maximum swash plate angle
|
o
|
± 18 o
|
|
Weight
|
kg
|
30
|
35
|
40
|
47
|
70
|
124
|
152
|
197
|
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