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BA 5010 EN 03.10
5.9 Torque­limiting backstop (special design)
A torque­limiting backstop is available for special uses, e.g. dual drives. The backstop is a combination
of a backstop with centrifugally operated sprags and a brake. The slipping torque is set by a number of
compression springs.
This "slipping" will protect the gear unit and the sprags of the backstop from inadmissibly high stresses
during negative rotation. In addition, a uniform load distribution onto both gear units is achieved during
negative rotation when using dual drives.
1
3
7
2
x
min.
4
5
6
Fig. 25: Torque­limiting backstop
1 Outer ring 5 Locking wire
2 Inner ring 6 Lead screw with compression spring
3 Cage with sprags 7 Friction lining
4 Shaft (adapter flange)
The torque­limiting backstop is attached to the gear unit by means of an adapter flange to form an oiltight
seal and is integrated in its oil circulation system.
The stop direction can be changed by turning the cage around. If a change in stop
direction is required, FLENDER should be consulted beforehand.
The slipping torque was set at the correct value at the FLENDER works; resetting during
startup is not permissible.
To safeguard the set slipping torque, the lead screws of the compression springs are
secured with locking wire. The warranty will expire if the locking wire for the screws is
missing or has been damaged.
For safety reasons, it is absolutely prohibited to change the slipping torque.
After having stopped the motor, there is a danger that the load is not safely held
in its position and can run in reverse direction at high speed.
As a rule, the backstop operates without wear. As a precaution, the dimension "x
min.
"
must be checked once yearly and after every releasing operation (Type FXRT only).
To avoid damaging the backstop or the gear unit, the motor must not be run
adversely to the stop direction of the gear unit.
Observe the notice fixed to the gear unit.