Automatic Reset

Type JC & JB Automatic Reset Torque Limiters

Type JC Automatic Reset Torque Limiters

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

Normal Running
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.
Normal Running
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.

Type JB Automatic Reset Torque Limiters

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
Also available fitted with pulley (JBP)
Rigid Coupling (JBR)

Normal Running
The drive is transmitted between the hub flange 1 and the drive flange 2 by the balls 4, spring-loaded into the pockets on the ball detent ring 3 secured by dowels.
Disengagement
On overload, the balls are displaced axially through the hub flange, 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 5 thus increasing the spring pressure. After setting, the nut is locked by a set screw.
Installation
Clutches can be supplied pilot bored or finish bored and keywayed. The hub may be fitted to either shaft and should be axially constrained against a shoulder to resist the resetting force and locked by means of a set screw onto the shaft key. The drive flange may be connected to a flexible coupling or can carry a sprocket or pulley.

Application
This type of protection is ideally suited to drives where it is essential to restart in the correct sequence and where access for manual resetting is not available.

Applicable to all variants.
Note: Type JBB 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.

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.

Standard tolerances on keyways is JS9 and on bores H8 to BS 4500:1969.

Applicable to all variants.


SPEC SHEETS:

Type JCB
Automatic Reset Release Torque: 10 to 150 Ib ft, 14 to 210Nm
Type JCR
Type JCB combined with rigid coupling
Type JCF
Type JCB combined with Brunel Eflex flexible coupling
Type JCS
Type JCB combined with sprocket
Type JCP
Type JCB combined with pulley


Type JBB – Automatic Reset
Release Torque: 50 to 1000 Ib ft, 70 to 1356Nm
Type JBS
Type JBB combined with chainwheel
Type JBF
Type JBB combined with Brunel Eflex flexible coupling