Working Principle :- The Pneuflex units are used as both
clutches and brakes like pneumatic drum brake, pneumatic disc clutches in
general power transmission applications on all types of machinery. The
primary feature of this design is the pneuflex torsional resilient principle
made possible by the transmission of the power through sidewalls of the
flexible rubber and cord actuating tube. These expand radially inwards when
pressurized. This constricting tube forces friction shoes against
cylindrical drums. More is the pressure more is the torque transmitted. The
flexibility also permits minor shaft misalignment. We are offering pneumatic
clutches, pneumatic brakes, pneumatic drum clutches, pneumatic drum brakes
which have following features...
Features :-
- Airtube applies force at maximum radius from axis.
- Uniform contact velocity.
- Self adjustment.
- No lubrication.
- Centrifugal force assists clutch disengagement.
- Operates in any plane.
- Full 360 friction surface.
Working Principle :-The Pneuflex units are designed and
built for severe clutching and braking applications on heavy duty equipment.
They are unmatched for high stating loads and sustained slippage where heat
generated tends to shorten the operating life of conventional clutches.
Their high torque ratings permit use of small diameter compact units.
Ventilated construction permits passage of cooling air to rapidly dissipate
heat from the friction shoes. Torque is transmitted from the side plates of
the elements through torque bars to the friction shoes. Pressurizing the
actuating tube forces the friction shoes to engage around a cylindrical
drum. Leaf springs in the torque bar cavities of the backing plates retract
the friction shoes when the actuating tube pressure is released.
Features :-
- Airtube applies force at maximum radius from axis.
- Uniform contact velocity.
- Self adjustment.
- No lubrication.
- Centrifugal force assists clutch disengagement.
- Operates in any plane.
- Full 360 friction surface.
The PNEUTORQUE Clutch / Brake combination unit consists of an air
actuated disc clutch and spring applied Disc Brake. Its compact design
combined with its high thermal capacity and low air consumption makes it
ideal for high speed, high cyclic, heavy-duty industrial applications. When
cylinder is pressurized, the piston clamps the clutch disc to the hub, which
transmits the torque to shaft. When cylinder exhausts, the springs moves the
piston in the opposite direction clamping the brake disc & stopping the
shaft.
Overlap between Clutch and Brake is completely eliminated. Pneutorq offers
a wide range of pneumatic drum brake and pneumatic disc clutches units for
use in Power presses, Shearing machines, Wood working machines & Special
Purpose machines with the large range of sizes and capacities of Clutch
Torque 260 NM to 26000 NM and Brake Torque from 180 NM to 18000 NM are
available in numerous models.
Properties, areas of application
Clutches and brakes in both single and double-plate versions permit high
switching frequencies and high thermal loading. Multi-plate versions, on the
other hand, provide a favourable torque size ratio, but their permitted
thermal loads are lower than for the single and doubleplate versions.
Pneumatically actuated clutches with spring-applied brakes can be supplied
as a combined unit in a single-plate version. This unit, which was developed
in particular for presses and guillotines, is capable of being fitted
between flywheel and machine body in a very small space.
Operation
With pneumatic clutches, the axial thrust for building up the torque is
transmitted by a piston running in a cylinder. When the cylinder space is
depressurised, the springs push back the piston to its starting position.
With spring-applied brakes, the axial thrust required for building up the
torque is generated by springs. The brake is released by applying the
appropriate pneumatic pressure to the piston. In the combined units, the
frictional connection is produced on the clutch side with air pressure and
on the brake side with spring pressure. The number of springs and thereby
the spring pressure can be selected in accordance with the level of torque
required.
Being a compact unit it is mainly used in machine tool and where
dimensions are critical. These are normally off type units. Frequent
adjustment is required as clutch plates wear. Wearing parts are replaceable.
