4
Mechanical installation
Accessory equipment
Assembly and Operating Instructions – Gear unit series R..7, F..7, K..7, K..9, S..7, SPIROPLAN
®
W
74
4.13
Accessory equipment
4.13.1
AR.. and AT.. centrifugal and friction couplings
AR.. friction coupling
Drives with a slip clutch consist of a standard gear unit and motor/variable speed gear-
motor with an adapter installed between them. This adapter accommodates the slip
clutch. In gearmotors with a double gear unit, the slip clutch may be located between
the first and second gear units. On delivery, the slip torque is set individually according
to the drive selection.
The following figure shows a drive with slip clutch and W speed monitor:
[8]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
1901048587
[1] Trip cam
[4] Friction lining
[7] Friction hub
[2] Incremental encoder
[5] Cup spring
[8] Speed monitor
[3] Driving disk
[6] Slotted nut
W speed monitor:
The speed monitor is used with constant-speed gearmotors and is connected to the
incremental encoder in the adapter.
WS slip monitor:
The slip monitor is used with the following components:
• Speed-controlled motors with speed sensor
• VARIGEAR
®
variable-speed gear units
INFORMATION
For further information about the AR.. coupling, refer to the "Start-up coupling and
slip clutch AR.. and AT.." operating instructions.
AT.. hydraulic centrifugal coupling
Hydraulic centrifugal couplings are fluid couplings based on the Föttinger principle.
They consist of 2 hinged hemispheres with blades separated by a tight gap.
The applied torque is transmitted by the inertial force of the streaming fluid. This fluid
circulates within a closed circuit, between the pump wheel (primary side) [12] on the
driving shaft (motor shaft) and the turbine wheel (secondary side) [9] on the driven
shaft (gear unit input shaft).
21932786/EN – 05/2015