| Quality and Autogard are
synonymous with overload protection. The companys reputation for high
quality products is derived from over 35 years of design innovation and
production. Autogard products are manufactured to meet ISO 9001 using
the latest machine tools and high quality materials.
The Ultra Module is used
to build a torque limiter by fitting a hardened seat into one half of a
coupling and the module unit into the other in such a way that torque is
transmitted between the drive ball and seat. This produces an end thrust
in the plunger in proportion to the applied torque. This force is
resisted by a ring of balls trapped between a flat surface and a conical
washer loaded by disc springs. When the axial force reaches a level
greater than the reaction through the spring mechanism, the ball and
plunger will retract forcing the balls up the plunger slope and allowing
the ball to disengage from the seat. The balls are then located on the
larger diameter of the plunger and all forces are balanced internally
allowing the torque limiter to run free and unloaded.
The trip torque is
externally adjustable and is achieved by turning the adjustor to
increase or decrease the spring pressure. Resetting is accomplished by
simply aligning the two halves, positioning the ball over its seat, and
tapping the reset pin with a soft hammer. Automatic reset versions are
also available.
Ultra Module units may incorporate an optional limit switch plate, which
moves on trip and can operate a switch to stop the drive.
|
Engaged
|
Disengaged
|
Manual Disengagement is
achieved by clockwise rotation of the disengagement sleeve. This feature
disconnects the drive and can be a useful tool for equipment setup
maintenance, and can also be used as a replacement for standard jaw
clutches.
Features
and Benefits
| |
Stainless
Steel construction to withstand harsh working environments |
| |
Accurate
and consistent torque setting including a vernier scale on
each module to allow consistent and accurate torque adjustment |
| |
Instant
and complete disengagement of drive and driveline inertia for
optimum protection |
| |
Adjustable
(in-place) torque setting to match the actual load
requirements |
| |
Provides
automatic motor shutdown, or an alarm signal by accommodating
proximity sensors or standard limit switches if the optional
sensor plate is used |
| |
Quick and
easy reset using alignment markers manually reset with a soft
hammer |
| |
Manual
disengage standard allows for the unit to be disconnected for
testing, replaces the need for a separate jaw clutch |
| |
Low
maintenance integral grease fittings allow periodic
lubrication of the unit without removing it from the drive |
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Manual disengagement sleeve can be used
to disengage the module, without affecting the torque setting.
By simply rotating the sleeve back to its original position and
hitting the reset pin with a soft hammer, the unit is once again
fully operational. |
 |
The vernier allows for accurate and
consistent adjustment of each module, and is used in conjunction
with a calibrated torque curve supplied with each unit. |
Series WT Torque
Limiter Selection
| Data
required for Torque Limiter Selection. |
| |
Horsepower
and rpm of the drive, including
reductions. |
| |
Downstream
equipment limitations (ie. maximum
chain pull, flight capacity, etc.) |
| |
Shaft
details of the driving and driven
equipment. |
| |
Drive
Medium details. |
| (1) |
Determine
the maximum Torque (in. lbs.) based
upon
equipment limitations, (chain pull)
Select the Torque Limiter, which has a
higher
torque rating.
|
| (2) |
Check the
Limiting Conditions:
|
| (a) |
Check
the hub bore capacity is suitable |
| (b) |
Check
the Torque Limiter dimensions such as
overall length and outside diameters. |
| (3) |
Select
and specify appropriate drive medium. |
All
Autogard Series WT units may be
supplied from the
factory at a pre-set torque and with
required Drive Medium assembled to the
unit. |
|
|
Longitudinal
collector tank, being driven by 1/2 HP
motor operating at 1750 RPM via a gear
reducer with a ratio of 1800:1.
|
| |
Customer
confirms that maximum allowable chain
pull is equivalent to 6,500 in. lbs.
at the reducer output shaft. |
| |
Reducer
output shaft diameter is 1.50 inches. |
|
Series WT
Selection based upon chain rating:
WT-1 with 2 Low Torque modules.
WT-1 Bore
Capacity: 1.750 inches
The WT-1 with 2 Low Torque modules is
acceptable in this application.
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| Ordering
the Series WT Torque Limiter |
|
When
ordering please provide the
following designation:
Model - Size / Modules / Bore
Example: WT - 1 / 2LT / 1.500
Refers to a Series WT size 1
Torque Limiter with 2 Low
Torque Modules and a bore size
of 1.500 inches.
Also specify
Torque setting if required
Limit switch plate option,
if required.
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