Internal Freewheels FDN|Suma

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Internal Freewheels FDN

Internal Freewheels FDN are sprag freewheels with anti-friction bearing dimensions.

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Product Detail

Features
Internal Freewheels FDN are sprag freewheels with anti-friction bearing dimensions.

The freewheels FDN are used as:

➧Backstops

➧Overrunning Clutches ➧Indexing Freewheels

The standard type and the type with P-grinding for increased service life and indexing accuracy do not have bearing support. In the case of the standard type, every second sprag has been replaced by a cylindrical roller; this freewheel can accept radial forces.

Nominal torques up to 2 400 Nm. The torque is transmitted on the outer ring by press fit.

Bores up to 80 mm. Many standard bores are available.

Application example

Internal Freewheel FDN 40 CFR in standard type with bearing support as an overrunning clutch on the shaft end of the main drive of a textile machine. The gear wheel is linked to an auxiliary drive. In normal operation (freewheeling oper ation) the inner ring overruns and the gear wheel with the pressed-in outer ring is at a standstill. During set-up, the machine is driven by the slowly running auxiliary drive via the gear wheel and the freewheel that is working in driving operation.

Sizes of Internal Freewheels FDN

Different types of Internal Freewheels FDN

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	bearing support dynamic C N	Load rating of static C0 N	Type	Nominal t orque M_N Nm	Bore d Standard mm mm		max. mm	B mm	D mm	K mm	Weight kg
FDN15	CFH	16	3 875	3 925	CFR	8	3 875	3 925	7 800	4200	CFP	7	8		8	20	37	50	0,1
FDN20	CFH	28	3 375	3 450	CFR	14	3 375	3 450	8 300	4200	CFP	12	12		12	20	42	55	0,1
FDN25	CFH	48	2 900	3 050	CFR	24	2 900	3 050	10 700	5600	CFP	21	15		15	20	47	60	0,1
FDN30	CFH	75	2 525	2 675	CFR	36	2 525	2 675	12 900	7000	CFP	32	20*		20*	20	52	65	0,2
FDN40	CFH	160	1 900	2 150	CFR	71	1 900	2 150	15 000	8400	CFP	71	25	28*	28*	22	62	80	0,2
FDN50	CFH	260	1 475	1 775	CFR	120	1 475	1 775	18 400	11300	CFP	120	30	35	35	22	72	95	0,4
FDN65	CFH	430	1 200	1 550	CFR	200	1 200	1 550	21 400	14100	CFP	210	40	50*	50*	25	90	120	0,7
FDN80	CFH	650	950	1 350	CFR	300	950	1 350	23 800	17800	CFP	320	50	60	60	25	110	140	1,2
FDN 105	CFH	2 400	800	1 175	CFR	1 100	800	1 175	48 600	45000	CFP	1 200	60	80	80	35	130	165	3,2

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 FDN in standard type and
type with P-grinding are without bearing sup-
port. Concentric alignment of inner and outer
ring must be provided by the customer. The per-
missible run out (T.I.R.) must be observed.
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.
The permissible operating temperature of the
freewheel is - 40°C to 80°C.

Lubrication
An oil lubrication of the specified quality must
be provided.
Example for ordering
Freewheel size FDN 30, type with P-grinding
with 20 mm bore:
• FDN 30 CFP, d = 20 mm