Technical Features
• Complete disengagement on overload
• Simple “one screw” torque adjustment
• Positive drive - no slip
• Rapid easy reset
• Torque setting maintained indefinitely
• Release action can operate a warning
device or limit switch
• Robust and compact design
• May also be used as a lever
operated clutch
For particularly dusty conditions such as
cement works we offer neoprene seals.
Please specify when ordering.
Note: Heavy components must not be
attached to the cover nuts of these Torque
Limiters. If in doubt consult Bibby
Transmissions.
Important - Use switch plate and limit
switch to quickly shut down drive on break
out, to avoid damage to bearing. For
prolonged periods of running disengaged,
ball-bearing mounted units must be used.
For higher speed applications, consult Bibby
Transmissions.
Application
The clutch can be installed in any drive
system, safeguarding against sudden
surges or gradual build-up of torque.
Modifications are possible to provide
manual lever operation of the clutch
while retaining the overload release
feature. Single direction release and one
position mesh can also be provided.
Normal Running
The drive is transmitted from the hub 1
through the splined ring 2 via the
tapered jaws 3 to the coupling flange 4.
The jaws are held together by spring
pressure acting through two angled races
(5 and 6) and a crowded circle of balls 7
located by a step on the hub.
Disengagement
On overload, the tapered jaws are thrust
apart, moving the splined ring 2 and
lifting the balls 7 over the step on the
hub, thus instantly disengaging the drive,
leaving flange jaw ring 4 free to rotate
on bearing 10.
Torque Adjustment
The release torque settings are made by
adjusting the control ring 9 so altering
the spring forces. The adjusting ring is
locked in position by a grub screw 8.
Re-engagement
To re-engage, the tapered jaws are
aligned using reference marks and the
sliding assembly pushed along the hub
until the balls snap back into their
original position. This requires no further
spring compression so is easily
accomplished.
For remote resetting the body can be
supplied with a flange to suit a resetting
mechanism. See diagram below.
Installation
Clutches can be supplied pilot bored or
finish bored and keywayed. The hub may
be fitted to either shaft and the flange
can be connected to a flexible coupling or
can carry a sprocket or pulley.
fitted with shifter ring which can also be
optionally used to operate a limit switch.
