Internal Freewheels FNR

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Internal Freewheels FNR

Internal Freewheels FNR are roller freewheels with bearing support. The freewheels of sizes 8 to 20 have a sleeve bearing. The sizes 25 to 60 have ball bearings, these enable higher speeds in freewheeling operation.
The freewheel is built into the customer housing. This makes compact, space-saving f itting solutions possible.

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Product Detail

Features

The freewheel is built into the customer housing. This makes compact, space-saving f itting solutions possible.

The freewheels FNR are used as:

➧Backstops

➧Overrunning Clutches ➧Indexing Freewheels

Nominal torques up to 3 000 Nm. The faces of both sides of the outer ring are provided with grooves for torque transmission.

Bores up to 60 mm.

Application example

Internal Freewheel FNR 40 as an indexing freewheel for an incremental drive in the feed- ing device of a wire processing machine. The i ndexing lever is driven by a crank operation. The back and forth movement is transferred by the indexing freewheel in a gradual rotating movement of the wire feeding device.

Sizes of Internal Freewheels FNR

Different types of Internal Freewheels FNR

Freewheel Size	Nominal torque M_N Nm	Max. speed Inner ring freewheels/ overruns min^-1	Outer ring freewheels/ overruns min^-1	Bore d mm	B mm	D mm	E mm	F mm	N mm	P mm	Weight kg
FNR8	18	1 200	1 200	8	20	37	19	30	6	3,0	0,1
FNR12	18	1 200	1 200	12	20	37	19	30	6	3,0	0,1
FNR15	50	950	950	15	30	47	23	37	7	3,5	0,3
FNR20	112	650	650	20	36	62	35	50	8	3,5	0,6
FNR25	220	1 550	3 350	25	40	80	40	68	9	4,0	1,3
FNR30	410	1 400	3 050	30	48	90	45	75	12	5,0	1,9
FNR35	500	1 300	2 850	35	53	100	50	80	13	6,0	2,6
FNR40	750	1 150	2 500	40	63	110	55	90	15	7,0	3,6
FNR45	1 020	1 100	2 400	45	63	120	60	95	16	7,0	4,2
FNR50	1 900	950	2 050	50	80	130	70	110	17	8,5	6,0
FNR55	2 000	900	1 900	55	80	140	75	115	18	9,0	6,8
FNR60	3 000	800	1 800	60	95	150	80	125	18	9,0	9,5

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

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

Mounting
The tolerance of the housing bore D must be
ISO H7 or G7 and the tolerance of the shaft must
be ISO h6 or j6.
The outer ring has to be completely enclosed in
a stable housing to transmit the listed torques.

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

Example for ordering
Freewheel size FNR 20, standard type:
• FNR 20