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Internal Freewheels FEN

Internal Freewheels FEN are sprag freewheels without bearing support.

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Product Detail

Features
Internal Freewheels FEN are sprag freewheels without bearing support.

The outer ring is pressed into the customer housing. This makes compact, space-saving f itting solutions possible.

The freewheels FEN are used as:

➧Backstops

➧Overrunning Clutches ➧Indexing Freewheels

In addition to the standard type, the type with RIDUVIT® can be supplied for extended service life.

Nominal torques up to 4 000 Nm. The torque is transmitted on the outer ring by press fit.

Bores up to 100 mm. Many standard bores are available.

Application example

Internal Freewheel FEN 82 SF as backstop fitted to the end of the intermediate shaft of a spur gearbox in the drive of a bucket conveyor. In the case of a motor stop, the bucket conveyor must be held securely so that the conveyor goods do not pull backwards. The thin outer ring that is pressed into the housing enables a space-efficient fitting solution.

Sizes of Internal Freewheels FEN

Different types of Internal Freewheels FEN

Freewheel Size	Type	Nominal t orque M_N Nm	Max. speed Inner ring freewheels/ overruns min^-1	Outer ring freewheels/ overruns min^-1	Type	Nominal t orque M_N Nm	Max. speed Inner ring freewheels/ overruns min^-1	Outer ring freewheels/ overruns min^-1	mm	Bore d Standard mm mm		max. mm	B mm	D mm	F mm	J mm	K min. mm	L mm	Weight kg
FEN 37	SF	220	2 500	2 600	SFT	220	2 500	2 600	20	25*		25*	25	62	55	37	85	35	0,4
FEN 44	SF	315	1 900	2 200	SFT	315	1 900	2 200	25			32*	25	70	62	44	90	35	0,6
FEN 44	SF	315	1 900	2 200	SFT	315	1 900	2 200	30			32*	25	70	62	44	90	19	0,5
FEN 57	SF	630	1 400	1 750	SFT	630	1 400	1 750	30	35	40	42*	35	85	75	57	105	45	1,2
FEN 72	SF	1 250	1 120	1 600	SFT	1 250	1 120	1 600	45	50		55*	36	100	90	72	132	60	1,8
FEN 82	SF	1 900	1 025	1 450	SFT	1 900	1 025	1 450	50	55		65*	40	115	100	82	140	60	2,9
FEN 82	SF	1 900	1 025	1 450	SFT	1 900	1 025	1 450	50	55		65*	32	120	100	82	140	60	3,2
FEN 107	SF	2 800	880	1 250	SFT	2 800	880	1 250	70			85*	45	140	125	107	175	65	4,2
FEN 107	SF	2 800	880	1 250	SFT	2 800	880	1 250	70			85*	45	150	125	107	175	65	5,0
FEN 127	SF	4 000	800	1 150	SFT	4 000	800	1 150	90			100*	62	165	145	127	195	75	7,0

The maximum transmissible torque is 2 times the specified nominal torque. See page 14 for determination of selection torque.

The maximum speed values listed above apply to installation conditions as they are given for Complete Freewheels. If the actual installation conditions are known, higher speeds may be permitted

under certain circumstances.

Keyway according to DIN 6885, page 1 • Tolerance of keyway width JS10.

* Keyway according to DIN 6885, page 3 • Tolerance of keyway width JS10.

Mounting
Internal Freewheels FEN are without bearing
support. Concentric alignment of inner and
outer ring must be provided by the customer.
The permissible run out (T.I.R.) must be obser-
ved.
The torque is transmitted on the outer ring by
press fit. In order to transmit the torques speci-
fied in the table, the outer ring must be accom-
modated in a housing with an external
diameter K. The housing is made of steel or grey
cast iron in minimum quality GG-20. When
using other housing materials or smaller exter-
nal diameters, we urge you to contact us regar-
ding the transmissible torque.
The tolerance of the housing bore D must be
ISO P6 and the tolerance of the shaft must be
ISO h6 or j6.

Lubrication
An oil lubrication of the specified quality must
be provided.

Example for ordering
Freewheel size FEN 72, type with RIDUVIT® and
50 mm bore:
• FEN 72 SFT, d = 50 mm