Housing Freewheels FH
for stationary arrangement in multimotor drives
with hydrodynamic roller lift-off for extended service life
Features
Housing Freewheels FH with hydrodynamic roller lift-off are typically used in cases where an
assembly can be driven from two or more motors or turbines at the same or similar high speed. They allow a continuous plant oper ation in the event that one of the energy sources or a drive line fails as well as energy saving in the case of partial load operation. The Housing Freewheels FH are completely enclosed freewheels for stationary arrangement with input and output shaft. The freewheels FH are used as:
Overrunning Clutch
if the speeds in freewheeling operation and in driving operation are the same or similarly high.
Advantages
1.Nominal torques up to 24 405 Nm
2.Shaft diameter up to 110 mm
3.Wear-free operation
4.Low noise
5. Low power dissipation
6 Integrated oil filtration system
7.Integrated locking brake
8. Oil change without down time
Hydrodynamic roller lift-off
Housing Freewheels FH are equipped with hydrodynamic roller lift-off. The hydrodynamic roller lift-off is the ideal solution for overrunning clutches at high speeds, not only in freewheeling operation, but also in the driving operation, as can occur, for example, in multimotor drives. In the case of hydrodynamic roller lift-off, the lifting force is generated by an oil film applied during freewheeling operation by centrifugal force exerted on the outer ring race. This provides for practically wear-free freewheeling operation. The speed differential between the inner and outer rings is the decisive factor affecting the lift-off function. If the speed
differential decreases, the lift-off force also decreases. Before achieving synchronous running, the clamping rollers guided in a cage are positioned with the aid of the central spring
system against the outer ring race and are then ready to lock. This guarantees immediate torque transfer once the synchronous speed has been reached. The hydrodynamic roller lift-off
enables a virtually wear-free freewheeling operation.
| |
Freewheel Size |
Type |
Nominal torque |
Max. speed |
Input shaft drives |
Shaft d1 and d2 |
A |
B |
C |
D |
H |
K |
O |
P |
Q |
R |
S |
Weight |
| MN |
Output shaft overruns |
| inch |
|
|
lb-ft |
min-1 |
min-1 |
inch |
inch |
inch |
inch |
inch |
inch |
inch |
inch |
inch |
inch |
inch |
inch |
lbs |
| FH 1 000 |
R |
1 000 |
5 600 |
5 600 |
1 3/4 |
12 3/4 |
12 3/4 |
3 7/16 |
16 1/4 |
12 7/8 |
3 7/8 |
19 5/8 |
4 5/8 |
5 3/4 |
14 1/2 |
11/16 |
231 |
| FH 2 000 |
R |
2 000 |
4 200 |
4 200 |
2 5/16 |
16 3/4 |
14 3/4 |
4 1/4 |
18 3/4 |
15 |
4 5/8 |
23 1/4 |
5 1/2 |
6 7/8 |
16 1/2 |
11/16 |
355 |
| FH 4 000 |
R |
4 000 |
3 600 |
3 600 |
2 3/4 |
18 |
15 1/2 |
5 1/16 |
20 |
17 1/8 |
5 3/8 |
25 5/8 |
6 1/8 |
7 3/4 |
17 1/2 |
11/16 |
496 |
| FH 8 000 |
R |
8 000 |
3 000 |
3 000 |
3 5/16 |
17 1/2 |
18 1/4 |
5 5/8 |
21 1/2 |
18 15/16 |
6 1/8 |
29 1/2 |
6 3/4 |
8 5/8 |
20 1/2 |
13/16 |
716 |
| FH 12 000 |
R |
12 000 |
2 500 |
2 500 |
3 7/8 |
18 1/4 |
21 1/2 |
6 5/16 |
22 3/4 |
20 15/16 |
6 15/16 |
34 1/8 |
7 1/2 |
9 5/8 |
23 3/4 |
1 1/16 |
926 |
| FH 18 000 |
R |
18 000 |
2 300 |
2 300 |
4 5/16 |
20 1/2 |
23 1/4 |
7 5/16 |
26 |
20 5/8 |
7 11/16 |
37 7/8 |
8 7/8 |
11 1/4 |
25 3/4 |
1 5/16 |
1 402 |
| metric |
|
|
Nm |
min-1 |
min-1 |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
kg |
| FH 1 000 |
R |
1 356 |
5 600 |
5 600 |
44,45 |
323,85 |
323,85 |
87,31 |
412,75 |
327,00 |
98,43 |
498,48 |
117,48 |
146,05 |
368,30 |
17,50 |
105 |
| FH 2 000 |
R |
2 712 |
4 200 |
4 200 |
58,74 |
425,45 |
374,65 |
107,95 |
480,00 |
381,00 |
117,48 |
590,55 |
139,70 |
174,63 |
419,10 |
17,50 |
161 |
| FH 4 000 |
R |
5 423 |
3 600 |
3 600 |
69,85 |
457,20 |
393,70 |
128,59 |
508,00 |
435,00 |
136,53 |
650,88 |
155,58 |
196,85 |
444,50 |
17,50 |
225 |
| FH 8 000 |
R |
10 847 |
3 000 |
3 000 |
84,14 |
444,50 |
463,55 |
142,87 |
546,00 |
481,00 |
155,58 |
749,30 |
171,45 |
219,08 |
520,00 |
21,00 |
325 |
| FH 12 000 |
R |
16 270 |
2 500 |
2 500 |
98,43 |
463,55 |
546,10 |
160,35 |
578,00 |
532,00 |
177,00 |
866,80 |
190,50 |
244,48 |
603,00 |
27,00 |
425 |
| FH 18 000 |
R |
24 405 |
2 300 |
2 300 |
109,54 |
520,70 |
590,55 |
185,74 |
660,00 |
600,00 |
195,26 |
962,00 |
225,43 |
285,75 |
654,00 |
33,00 |
636 |
Areas of application
Housing Freewheels as automatic clutches in multimotor drives fulfil here an important
function. They disengage a drive automatically as soon as it no longer provides power to the
working machine. The Housing Freewheels do not require any external operating equipment.
Typical applications for multimotor drives are:
? Generators
? Pumps
? Ventilators
? Fans
? Uninterrupted power supply
Application example
Three Housing Freewheels in the multimotor drive of a fresh air fan. The fan is driven by one
or two electric motors. An additional auxiliary drive serves to slowly turn the fan for the purposes of inspection work or for an even cooling down after shut down. The Housing Freewheels automatically engage the respective working electric motor to the fan.
Selection torque for Housing Freewheels FH
In many cases where overrunning clutches are being used, dynamic processes occur that cause high peak torques. In the case of overrunning clutches, the torques that occur during start up must be observed. The peak torques when starting up can, in the case of asynchronous motors - especially when accelerating large masses and when using elastic couplings - significantly exceed the torque calculated from the motor pullover torque. The conditions for internal combustion engines are similar. Even in normal operation, on account of their degree of irregularity, peak torques can occur that are way in excess of the nominal torque.
The prior determination of the maximum occurring torque is carried out most safely by using a rotational vibration analysis of the entire system. This, however, requires a know ledge of the rotating masses, the rotational rigidity and all of the excitation moments that
occur on the system. In many cases, a vibrational calculation is too time consuming or you
may not have all the necessary data in the configuration phase available. In this case, the selection torque MA of the overrunning clutch should be determined as follows:
MA = K ? ML
In this equation:
MA = Selection torque of the freewheel
K = Operating factor
ML = Load torque for constant rotating
freewheel:
= 9550 ? P0/nFR
P0 = Nominal power of motor [kW]
nFR = Speed of the freewheel in driving
operation [min-1]
After calculating MA the freewheel size must be selected in accordance with the catalogue tables in such a way that in all cases this applies:
MN ≥ MA
MN = Nominal torque of the Housing Freewheel FH in accordance with the table
values [Nm] The operating factor K depends on the properties of the driver and the machine. The general rules of mechanical engineering apply here. We recommend using an operating factor K of at least 1,5. We will be pleased to check your selection.
Locking brake
During freewheeling operation, the stationary input shaft of the Housing Freewheel is effected
by a drag torque from the freewheeling output shaft. By manually activation of the in the housing freewheel integrated locking brake the driving parts are prevented from being carried
along.
Mounting
The Housing Freewheel must be mounted insuch a way that shaft d1 is the input shaft and
shaft d2 the ouput shaft. We recommend the use of torsionally stiff shaft couplings generating only low reactive forces. On indication of the reactive forces that occur we are well prepared to check the usable life of the bearings installed.
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