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Last month we released the Ruland product range that is new to
Naismith Engineering and we took a closer look at the Ruland Shaft
Locking Collars
(View Article Here). This month we will look at the Ruland range of Precision Couplings. Ruland offer several Precision
Couplings: Beam, Bellows, Rigid & Oldham, all of which are
available from Naismith Engineering.
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Flexbeam-3™ couplings are ideal for light duty power
transmission applications such as coupling a servo motor to a
lead screw in a motion control system. The couplings feature
larger body sizes and stronger beams to provide high torque
capacity and very low windup, without sacrificing misalignment
capabilities.
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The Flexbeam-2™ couplings are designed specifically for
precision applications, especially those that use delicate
components such as encoders and tachometers. The small bearings
on these components make low radial forces essential to
longevity and continued high performance. The Flexbeam-2™
provides extra flexibility to yield reduced bearing loads, and
shorter industry standard lengths to fit in confined spaces and
allow for easy retrofits in existing equipment. |
Bellows CouplingsBelflex™ bellows couplings are an
assembly of two aluminium hubs and a uniform, thin walled
stainless steel bellows. The use of aluminium hubs with a
bellows results in a coupling with very low inertia, a feature
that is very important in today’s highly responsive systems. The
characteristics of bellows make them an ideal method for
transmitting torque in motion control applications. |
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The bellows allow the coupling to bend easily under loads caused
by the three basic types of misalignment between shafts
(angular, parallel, axial motion). Among servo couplings,
bellows type couplings are one of the stiffest available, making
them ideal in high performance applications that require a high
degree of accuracy and repeatability. |
Nomar®
Rigid Couplings
Nomar®
rigid couplings are available in one and two piece
clamp designs, and set screw style, with and without keyways in
a variety of materials. A large number of standard sizes are
available to fit shafts from 3mm to 50mm in the metric series
and 1/4" to 2" in the inch series. |
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Clamp style rigid couplings wrap around the shaft, providing
high torsional holding power without the shaft damage and
fretting that occurs when set screw style couplings are used.
Two-piece clamp styles also allow for disassembly and
maintenance without removal of other machine components and
feature opposing hardware for a balanced design. |
Paradrive™
Oldham CouplingsParadrive™
oldham couplings are three piece
couplings comprised of two hubs and a center member. The center
disk, which is available in a choice of acetal for high
torsional stiffness or nylon for vibration and shock absorption,
is the torque transmitting element. Torque transmission is
accomplished by mating slots in the center disk, located on
opposite sides of the disk and oriented 90 degrees apart, with
the drive tenons on the hubs. |
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The slots of the disk fit on the tenons of the hub with a slight
press fit. This press fit allows the coupling (with an acetal
disk) to operate with zero backlash. This design is particularly
well suited for handling relatively large amounts of parallel
misalignment. The disks are also electrically isolating and can
act as a mechanical fuse. When the plastic insert fails, it
breaks cleanly and does not allow any transmission of power,
preventing other damage from occurring to more expensive
machinery components. |
or email Naismith Engineering at
marketing@naismith.com.au
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