Bearings and shaft load
All machines are equipped with rolling-contact bearings. Normally. the non-locating bearing (ball bearing) is intended for the drive end and the locating bearing (ball bearing) for the non-drive end. Machines with
industrial roller bearings at the drive end are available for applications where increased radial forces can occur. for instance when using
industrial pulleys. Please specify radial forces in your order.
Ball bearing assignment for D-end Ball bearing assignment for D-end
Frame size D-end N-end Frame size D-end N-end 100 6209 2ZRC3 6306 2ZRC3 100 NU 209 E 6306 2ZRC3 132 6312 2ZRC3 6310 2ZRC3 132 NU 312 E 6310 2ZRC3 160 6313 2ZRC3 6311 2ZRC3 160 NU 313 E 6311 2ZRC3 180 6314 2ZRC3 6312 2ZRC3 180 NU 314 E 6312 2ZRC3 225 6316 2ZRC3 6314 2ZRC3 225 NU 316 E 6314 2ZRC3
Determination of radial forces F
R When using pulleys. the radial load is calculated according to the following formula: P = Nominal power in kW
Fk210PnD -1 R7 [N] n = Nominal speed in min D = Disk diameter in mm The belt tightening factor k is approximately: k = 1.8...2.5 for V-belt k = 2.2..3.5 for
flat belt (Observe specifications of the belt manufacturer)
For a safe transmission of the torque it is necessary to utilise the entire bearing length of the key. Otherwise. an excessive compressive load per unit area may occur at the key which may result in a motor defect. The pulley must be mounted up to the shaft shoulder and is tightened with the following tightening torques as a maximum. Gland M5 M6 M8 M10 M12 M16 M20 Tightening torque 2.2 Nm 4.0 Nm 10.0 Nm 19.0 Nm 33.0 Nm 80 Nm 160 Nm Permissible radial forces F
R at the shaft end The ball bearings are dimensioned for a calculated service life of approx. 20.000 operating hours
1) . The load values specified in the following must not be exceeded. The specified permissible radial forces F
R are valid only for horizontal mounting of the motor without additional axial forces. If additional forces occur. please consult the manufacturer. Axial load of the motor shaft When mounting industrial clutches. pulleys. etc. onto the motor shaft. axial forces must not occur! Therefore use the internal thread of the shaft end as assembly aid.
1) medium operating temperature < 90 °C medium operating speed < 2000 U/min (DA 100 – DA 160). medium operating sped < 1500 U/min (DA 180 – DA 225) Technical alterations reserved 02/05Three-phase asynchronous motors DA 100-22524 Baumüller Nürnberg GmbH