| Brunel Torque Limiting Clutches | |
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| Type JCB Automatic Reset Release Torque: 10 to 150 Ib ft, 14 to 210Nm |
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| Technical
Features • Instant release at pre-set torque • Smooth hold-out for one revolution • Means for motor switch-off • Automatic self-engagement on restart without loss of phasing |
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Lower
release torques can be achieved. Consult Brunel Corporation.
Tolerance
on spigot diameter B is f7 to BS 4500:1969.
For
higher release torques use Type B on page 9.
Standard
tolerances on keyways is Js9 and on bores H8 to BS 4500:1969.
Applicable
to all variants.
The drive is transmitted between the hub flange 1 and the housing 2 by the balls 3, spring-loaded into the pockets on the flange face.
Disengagement
On overload, the balls are displaced axially through the housing, further compressing the springs. Once out of their pockets, the balls roll on the face of the hub flange for one revolution before re-engaging and synchronizing the drive.
Torque Adjustment
The release torque is set by tightening nut 4 thus increasing the spring pressure. After setting, the nut is locked with a set screw and plug.
Installation
Clutches can be supplied pilot bored or finish bored and keywayed. The
hub may be fitted to either shaft and should be located against a shoulder
to resist the resetting spring force and locked by means of set screw
in the hub flange. The drive flange may be replaced by a sprocket, pulley,
etc., or connected to a coupling. See pages 12 and 13.
Application
This type of protection is ideally suited to drives such as wrapping and
packing machinery where it is essential to restart in the correct sequence
and where access for manual resetting is not available.
Type JC clutches should always be used with a limit switch to bring
the drive to rest within a few revolutions thus preventing possible damage
by continual releasing and resetting.