Internal Freewheels FNR
for keyway connection on the outer ring
with rollers and bearing
 
Features
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 fitting 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 indexing 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.
 
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.