LORD Dynaflex® LCD Series Couplings have been developed to overcome numerous torsional problems associated with vehicular and industrial driveline systems. These couplings increase equipment life by protecting against torsional vibration, shock and misalignment.

Typical application attachments:
• Flywheel to shaft
• Flywheel to hub (splined)
• Shaft to shaft
• Floating shaft

Features and Benefits:
• Protection from torsional shock loads
• Design flexibility
• Safe for occasional severe overloads
• Vibration isolation – extremely low torsional spring rate is achieved with the Dynaflex LCD Series Coupling, using elastomer in shear. This allows for low system natural frequencies and isolation of first mode driveline disturbances.
• Damping at resonance – the elastomer used in Dynaflex LCD Series Couplings effectively reduces vibration at resonance.
• Shock protection – torsional shock loads are attenuated by large shear deflection of the elastomer. In the case of severe overloads, equipment damage is prevented by slippage between the elastomer and the outer housing.
• Misalignment accommodation – elastomer flexibility allows for angular, parallel and axial misalignment.
• Long service life – Dynaflex LCD Series Couplings have proven themselves under demanding and rugged service conditions.
• Maintenance-free – elastomer flexibility accommodates all motion without wear, eliminates the need for lubrication.
• Noise reduction – no metal-to-metal contact; elastomer attenuates structure-borne noise and isolates vibration from components that would act as noise generators.
• Attachment – fits many standard SAE flywheels.
• Design flexibility – standard rubber molds are used to produce each different size coupling shown in this catalog. Often it is necessary to change metal components for custom applications. This is common.
• Systems Engineering – Parker LORD has in-house computer capabilities for multi-mass torsional analysis to assist in proper coupling selection.

Standardization of Proven Concept
Using the experience gained in designing and producing special Dynaflex couplings, Parker LORD has developed a new standard product line of heavy-duty Dynaflex couplings. These couplings have a specially designed elastomeric element bonded to a metal inner member which is then preloaded and friction-fit into an outer member.
This unique concept provides low torsional spring rates which effectively isolate critical vibratory disturbances in driveline and accessory systems, thus prolonging equipment life. Misalignment and torsional shock loads are absorbed by shear deflection in the elastomeric element.
The ability of the coupling to slip at the outer member with short duration shock overloads protects the driveline and accessory components from premature failure. The Dynaflex LCD Series Coupling has been particularly successful for diesel driven applications.
Dynaflex LCD Series Couplings are available in 75 to 2000 hp ratings at a nominal 2000 rpm. Each size is also available in two stiffness values. These are referred to as the A and C stiffness values. The C stiffness parts are normally stocked.

Dynamic Torsional Stiffness, Kθ
The dynamic torsional stiffness is higher than the static stiffness at room temperature. When the LCD Series Couplings are attached to diesel engine flywheels, the elastomer gets warm. At an operating temperature in the 170° to 200°F range, the dynamic stiffness is nearly the same as the static stiffness at room temperature. The stiffness values shown in the performance characteristics chart are for computer modelling and in other types of torsional analysis work.
Static Load Deflection Characteristics of LCD-0400-01-A & -C and LCD-0400-04-A & -C
Curves of other LCD parts show similar characteristics and are available upon request.
Typical Applications
Dynaflex LCD Series Couplings are useful for a wide range of rotary drive applications, from off-highway truck drivelines to auxiliary compressor drives on diesel locomotives. The soft torsional stiffness of these couplings makes them ideally suited for diesel applications with remotely mounted driven components.

Typical applications include:
• Mining Dump Truck – Increases engine and transmission life
• Diesel Locomotive – Eliminates accessory driveline failure
• Portable Air Compressor – Replaces short lived gear coupling; smooth operation
• 4-wheel Drive Farm Tractor – Reduces noise and extend drive train life
• Military Vehicle – Eliminates accessory shaft breakage
• Dynamometer – Prevents driveline failure
• Mining Dump Truck – Prolongs u-joint life