• No lubrication required
• No metal-to-metal contact
• Fail-safe (will still perform if elastomer fails)
• Easy installation
• Four different shore hardness urethane elastomers available
• Urethane spiders provide high abrasion resistance and elasticity, along with good damping characteristics
• Resistant to oil, dirt, sand, grease, moisture, many solvents, as well as the atmospheric effects of ozone
• Both rough stock bores and finished inch & metric bores are available

As the premier manufacturer of couplings in the world, Lovejoy offers the full line of the European standard jaw coupling. Supplied and in use around the world, Lovejoy’s curved jaw couplings can meet your every curved jaw need.
The curved jaw three-piece design incorporates a radial curvature to the jaw face, as well as both radial and axial curvature (crowning) to the elastomer (spider). This feature provides improved torsional softness and an angular misalignment capability of up to 1.3°.

The curved jaw type coupling provides highly reliable service for light, medium, and heavy duty electrical motor and internal combustion engine power transmission applications. Common applications for curved jaw type couplings include connecting power sources to pumps, gear boxes, compressors, blowers and fans, mixers, conveyors and generator sets.

• Eliminates the need for lubrication and coupling maintenance
• Coupling can be inspected without disassembly
• Condition of disc packs can be inspected with a strobe light while the machine is running
  (Note: It is not recommended that couplings be operated without coupling guards.)
• Easy to assess equipment misalignment
• Torsionally rigid without any backlash
• No wearing parts
• Resistance to harsh environments
• Long life when properly sized and aligned
• High power density (higher torque for a given outside diameter)
• Lovejoy supports the API-610 Standard up to 3,800 RPM
• Unitized disc packs ensure repeatability necessary for meeting the balance and piloting requirements as mandated by API-610
• ATEX Certified for SU, SX, DI, SXC, SXCS, SXCST, DIR, DILR, DIRA and DIRLA product lines

Lovejoy takes great pride in being able to offer a wide variety of superior disc coupling products in models designed to meet the application needs of today’s worldwide power transmission market.

Using advanced design techniques, implementation of Finite Element Analysis, and extensive testing of materials, Lovejoy has developed an innovative disc pack profile design revolutionary to traditional disc pack designs found in the market. This disc pack can accommodate 1/2° to 1-1/2° of angular misalignment, and is used in all Lovejoy disc coupling products.

Lovejoy disc packs are manufactured using high grade stainless steel (AISI-301), ensuring high strength, high endurance to fatigue, and resistance to most environmental conditions.

Lovejoy disc couplings utilize unitized disc packs with 4, 6 or 8 bolt designs. While the 8 bolt design can transmit greater torque than the 6 or 4 bolt design, it is not able to accommodate as much angular misalignment.
Lovejoy couplings can also be fitted with overload bushings to protect the disc pack during momentary torsional overloads.

• Torsionally flexible and resilient - vibration reduction up to 30%, plus cushion shock loads safeguard driving and driven equipment
• Quick installation and easy maintenance reduces labor and downtime costs
• Fully interchangeable with industry standards
• Versatile stock; metric and imperial size cover fasteners available
• High tensile, shot-peened alloy steel grids and precision machined hubs ensure superior performance and long life.

The Lovejoy Grid coupling reduces vibration by as much as 30%, and cushions shock loads to safeguard your driving and driven equipment. The flexible nature of the spring-like grid absorbs impact energy by spreading it out over time, thus reducing the magnitude of the peak loads. This is possible because of the progressive contact that occurs between the curved profile of the hub teeth and the flexible grid.

Therefore, as the load increases, more of the tooth comes into contact with the grid, thus supplying superior protection and supreme performance.
Lovejoy’s Grid couplings are designed for versatility. Common hubs and grids are used within a given size range for both horizontal and vertical split cover models. Grid installation and replacement is a “snap” at only a fraction of the complete coupling cost.

Top Quality Manufacturing – Made from high tensile alloy steel, the grid spring is carefully formed to shape, then hardened and tempered under controlled conditions. Next, the grids are shot-peened, compressing the surface molecules and leaving a residually stressed surface. This process creates a stronger surface in compression.

Any load applied on the coupling in operation must first surmount the compressive forces created by peening before the tensile stress reaches the grid. This provides a dramatic increase in rating over other coupling types, increases reserve strength for longer life and may permit selection of a smaller coupling, thus reducing cost.

• Designed with latest advances in Finite Element Analysis technology
• Increased nominal torque
• Larger maximum bore size
• Advanced seal design to increase contamination resistance

By deploying the latest advances in Finite Element Analysis technology, and building off of decades of proven success with the complete Lovejoy / Sier-Bath gear coupling line, Lovejoy's engineering team has revolutionized the gear coupling. This revolution, known as HercuFlex™ offers increased nominal torque, larger maximum bore size and longer service life. Despite the advanced nature of these improvements, the HercuFlex Gear Coupling still utilizes the standard AGMA flange interface to ensure field interchangeability.

In addition to unequaled bore and torque capacity while maintaining compliance with standard AGMA flange interfaces, key features include 1.5° of misalignment per gear mesh, stronger alloy steel hubs and sleeves (on the FX, CX, and FXL), improved fastener corrosion resistance, and advanced seal design for increased contamination resistance. Furthermore, the hubs and seals used for both the flange and continuous sleeves HercuFlex gear coupling designs are common and interchangeable parts. This commonality allows for increased inventory rationalization for stocking partners.

• Dynamically balanced
• Fasteners are weigh balanced
• Body fitted bolts in reamed holes
• Precision manufactured close tolerances
• Custom design assistance
• Available in sizes from 1 through 30 depending on model

Lovejoy High Speed and Engineered Special Gear Couplings satisfy a specific engineering need for custom coupling designs that require additional engineering. While standard components do exist, the unique requirements of individual applications will customize a coupling design. (For stock gear couplings, please see our Gear Couplings product page.)

High Speed - The Lovejoy / Sier-Bath F Series High Speed gear couplings are designed for exacting high speed, high efficiency performance beyond the ranges and limits of standard coupling specifications. Typical applications include high speed centrifugal and axial flow compressors, gas turbines, steam turbines, test stands, etc. High speed couplings are dynamically balanced as assemblies and match marked. Fasteners are weigh balanced in sets. Major diameter fit gear teeth, precision machined tolerances, and high quality components help to reduce the potential unbalance in the coupling assembly.

Engineered - Many of the components are standardized, but the special requirements of certain applications will customize each design. These couplings require specific customer input to properly design the coupling to suit the application.

• Lovejoy offers the most hydraulic coupling solutions
• L-line, CJ-Line, LH Line, Nyflex®, Mite®, Dentex®, and more

Lovejoy offers an unparalleled assortment of couplings to meet your every hydraulic need.

• 2° angular misalignment capability
• .030” - .047” parallel misalignment capability
• 50D shore Urethane material — max. temperature of 200°F (93°C)
• Torsional wind-up of 5° at full load
• Retaining ring is made from #347 cast stainless steel
• Can be used with AL-type aluminum Jaw coupling hubs for sizes AL090/ 095, AL099/100 and AL110 (Stainless steel hubs can be made-to-order as well)

The Jaw In-Shear Coupling is non-fail safe, and thus the coupling acts as a fuse to prevent equipment damage in the event of torque overloads. Instead of the spider being compressed in between the interlocked jaws of each hub, our In-Shear coupling has the hubs drawn apart with the jaws aligned axially. The wider spider is then in a shear-plane.

The Jaw In-Shear Spider is radially removable, meaning that neither hub (or driver/driven equipment) has to be moved to make replacements of the Spider. This saves time and money in maintenance costs. The retaining ring which encloses the In-Shear Spider has three small nubs which simply slide into J-shaped grooves in the perimeter of the Spider and twist-lock into place.

This feature has a Patent Pending. It will not work its way loose and since there are no fasteners involved, the maintenance and removal of the Spider takes only a few minutes. A second patent is pending for the In-Shear spider in use with Lovejoy straight sided Jaw Hubs. Lovejoy’s new In-Shear Spider is used with our industry-standard L-Type and C-Type Jaw Coupling hubs which provides another added convenience — no need to stock different hubs just for this new design of elastomer.

Existing applications using in-compression spiders can simply be retrofitted with the new In-Shear Spider if the features are beneficial. The Jaw In-Shear Spider is made from a tough Urethane formula which provides the best combination of durability, chemical resistance, temperature range, and torsional softness. The hubs it is used with go up to a maximum bore of 4.00” (102mm).

Common applications for the Lovejoy Jaw In-Shear Coupling include: electric motors to centrifugal pumps, fans, blowers, gear boxes, and plastic extruding machinery. It solves many maintenance problems in industries like pulp & paper, petrochemical, mining and steel.

• Fail-safe — will still perform if elastomer fails
• No metal to metal contact
• Resistant to oil, dirt, sand, moisture and grease
• More than 850,000 combinations of bore sizes
• Most types available from stock in 24 hours

The Jaw Type couplings from Lovejoy are offered in the industry’s largest variety of stock bore/keyway combinations. These couplings require no lubrication and provide highly reliable service for light, medium, and heavy duty electrical motor and internal combustion power transmission applications.

Applications include power transmission to industrial equipment such as pumps, gear boxes, compressors, blowers, mixers, and conveyors. Lovejoy’s Jaw Type couplings are available in 24 sizes from a minimum torque rating of 3.5 in–lbs (0.4 Nm) to a maximum torque rating of 170,004 in–lbs (19209 Nm) and a bore range of .125 inches (4.45mm) to 7 inches (178mm). Lovejoy’s standard bore program covers AGMA, SAE, and DIN bore/keyway and spline bore combinations.

Lovejoy Jaw Type couplings generally consist of two hubs (available in sintered metal, aluminum, bronze, steel, stainless steel, and ductile iron), and an elastomer element, known as a spider or cushion (materials available include NBR SOX rubber, Urethane, Hytrel®, and Bronze).

• High load capacity
• Compact size
• Operate in Wide Temperature Range

Lovejoy offers a variety of designs and models in its gear coupling family. From standard, off-the-shelf stock to new, high speed, special designs-Lovejoy can satisfy your gear coupling needs.

Lovejoy / Sier-Bath gear couplings are stocked in a wide assortment of configurations, which include C and F standard hubs and sleeves, Mill Motor hubs, Vertical style, Floating Shaft, and Spacer designs. Lovejoy’s superb engineering staff makes it possible to support many additional coupling types such as the Brake Drum type, Sliding Hub type, Shear Pin, Jordan type, and custom lengths for non-standard shaft separations. Additional size ranges and designs to meet unusual application requirements can also be manufactured by Lovejoy to meet market demands.

Material can range from standard steel, to alloy steel and even stainless steel. The exceptional simplicity of the Lovejoy coupling design makes this all possible.
Applications for Lovejoy gear couplings are numerous. Continuous and flanged sleeve gear couplings are known for serve applications involving extended distances between shaft ends, mill motors, and limited end float situations. Lovejoy nylon sleeve gear couplings are known for their effectiveness in motor/ generator sets, motor/pump sets, and many other light duty industrial settings

• Huge variety to meet your specific motion control need
• Solutions include: Beam, Oldham, Mini-Jaw, Bellows, Mini-Soft, Mini-Disc, & Curved Jaw

The selection process for determining the proper Motion Control coupling starts with selecting the coupling design that best addresses the application requirements. The Lovejoy Motion Control Coupling Quick Reference Chart of the Motion Control catalog, provides a method of weighing performance characteristics of the Beam, Bellows, Mini-Disc, Oldham, Mini-Soft, Curved Jaw, and Mini-Jaw couplings.

Each coupling is compared side by side in critical categories such as: material, torque, torsional stiffness, bore capacity, maximum RPM, misalignment capacity, maximum temperature and moment of inertia.
Once a design is selected, the proper size must be determined based on the capabilities of the particular design. The Beam, Bellows and Mini Disc designs all have a single piece construction, so only one part needs to be selected.

The GS curved jaw, Oldham, Mini Soft, and Mini Jaw designs have a three piece constructions, consisting of two hubs and an insert. When the shaft size of the driver and driven are the same diameter, the hubs will be the same. When the shaft diameters differ, the hubs selected will differ accordingly.

• Easy to Install
• Maintenance Free
• No Lubrication
• Dampens Vibration and Controls Shock
• Torsionally Soft
• Double Engagement

The simple design of the S–Flex coupling ensures ease of assembly and reliable performance. No special tools are needed for installation or removal. The S–Flex couplings can be used in a wide variety of applications.

The S–Flex coupling design is comprised of three parts. Two flanges with internal teeth engage an elastomeric flexible sleeve with external teeth. Each flange is attached to the respective shaft of the driver and driven and torque is transmitted across the flanges through the sleeve. Misalignment and torsional shock loads are absorbed by shear deflection in the sleeve. The shear characteristic of the S–Flex coupling is very well suited to absorb impact loads.

The S–Flex coupling from Lovejoy offers combinations of flanges and sleeves which can be assembled to suit your specific application. Thirteen sizes are available with torque capabilities that range from 60 in-lbs (6.78 Nm) to 72,480 in-lbs (8189 Nm). The S–Flex flanges are offered in five models which are made from zinc die cast or cast iron. Sleeves are available in EPDM rubber, Neoprene, or Hytrel® to address a wide variety of application requirements.

• Family of couplings designed specifically to address problematic torsional vibration
• Wide variety of solutions for diesel engine driven equipment
• Excellent engineering staff on hand; ready to help

Lovejoy offers a wide range of torsional couplings engineered to solve torsional vibration problems found in diesel engine driven equipment and other applications where torsional vibrations are prevalent. These include all internal combustion engines, reciprocating pumps and compressors, as well as variable frequency drives (VFD).

Lovejoy torsional coupling are designed to dampen torsional vibrations and tune, or adjust the system’s critical speeds away from the application’s operating range. With the proper information, Lovejoy engineers can perform a Torsional Vibration Analysis or TVA for your application to assist in the selection of a torsional coupling.