Bernecker + Rainer MAMOT7-ENG, Руководство пользователя

Страница: 38 / 65

Installation conditions
38 8LVA user's manual V1.0
Warning!
Personal injury and damage to property due to failure or overheating of the drive.
If the maximum permissible operating temperature is exceeded, an arising drive defect with conse-
quential damage is very probable.
The cause of a defect could insufficient lubrication due to overheating, for example.
•
For safety reasons, switch off the machine if the maximum permissible temperature is exceed-
ed.
•
Ensure unobstructed air circulation and cooling so that no heat accumulation can build up in
the drive or machine.
4.2 Load due to radial and axial force
Radial and axial forces (F
r
, F
a
) applied to the shaft end during operation and installation must observe the conditions
listed below.
Simultaneously
loading the shaft
end with the maximum values of
F
r
and
F
a
is not permitted! Contact B&R if
this occurs.
Radial force
Radial force F
r
on the shaft end is a function of the loads during installation (e.g. belt tension on pulleys) and
operation (e.g. load torque on the pinion). The maximum radial force F
r
depends on the shaft end type, bearing
type, average speed, the position where the radial force is applied and the desired service life of the bearings.
Axial force, shift in shaft position caused by axial force
Axial force F
a
on the shaft end is a function of the loads during installation (e.g. stress caused by mounting) and
operation (e.g. thrust caused by slanted tooth pinions). The maximum axial force F
a
depends on the bearing type
and the desired lifespan of the bearings.
8LVA1 (with/without holding brake)
8LVB2 (with holding brake)
The
fixed bearing
is secured on the
B flange
with a retaining ring. The floating bearing is preloaded on the A
flange with a spring in the direction of the B flange. Axial forces in the direction of the A flange can cause the spring
bias to be overcome, which shifts the shaft by the amount of axial backlash in the bearing (approx. 0.1 - 0.2 mm).
This shift can cause problems on motors with holding brakes or all motors with inductive encoder systems. As a
result, no axial force in excess of the calculated values is permitted in the direction of the A flange when using
these motor (see "Determining permissible values of F
r
and F
a
).
8LVA2 (without holding brake)
8LVA3 (with/without holding brake)
The fixed bearing is secured on the A flange with a retaining ring. The floating bearing is preloaded on the B
flange with a spring in the direction of the A flange. Axial forces in the direction of the B flange can cause the spring
bias to be overcome, which shifts the shaft by the amount of axial backlash in the bearing (approx. 0.1 - 0.2 mm).
This shift can cause problems on motors with holding brakes or all motors with inductive encoder systems. As a
result, no axial force in excess of the calculated values is permitted in the direction of the B flange when using
these motor (see "Determining permissible values of F
r
and F
a
).
A and B flange position