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Lovejoy (Timken) – Flexible Shaft Couplings

Since entering the power transmission marketplace in the 1920s, Lovejoy has emerged as an international market leader. Today, the Lovejoy brand is recognized around the world as the premier supplier of flexible shaft couplings and other power transmission components.

During the past century, Lovejoy has been a pioneer in advanced manufacturing technologies. Lovejoy created the industry standard Jaw-style coupling in 1927, and was the first to incorporate rubber-in-compression as a power transmission concept. Today, Lovejoy’s engineers employ the latest and most advanced computer techniques to develop unique solutions and designs.

Lovejoy can meet all of your coupling requirements, from catalog standards to unique designs. In addition to custom-engineered solutions, Lovejoy offers a complete range of couplings in every size and type, including Curved Jaw, Jaw In-Shear, S-Flex (rubber and shear), Gear, Torsional, and Disc style. Lovejoy also supplies other power transmission components including variable speed drives, tensioning devices, universal joints, motor bases, and sheaves.

Lovejoy’s products cater to a wide range of industries; steel, pulp and paper, power generation, food processing, mining. and construction.

Product Groups


Jaw Type Couplings

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

Applications include pumps, gear boxes, compressors, blowers, mixers, and conveyors. 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 0.125 inches (4.45 mm) to 7 inches (178 mm).

Jaw type couplings usually have 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).

Jaw In-Shear Type Couplings

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, it 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 so neither hub has to be moved to replace the spider.

Common applications include: electric motors to centrifugal pumps, fans, blowers, gear boxes, and plastic extruding machinery. It solves many maintenance problems in industries like pulp and paper, petrochemical, mining, and steel.

Curved Jaw Couplings

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 degrees.

Common applications for curved jaw type couplings include connecting power sources to pumps, gear boxes, compressors, blowers and fans, mixers, conveyors, and generator sets.

Motion Control Couplings

Knowing the following is required when selecting a motion control coupling:

  • HP and RPM of the driver
  • Shaft size of the driver and driven
  • Application requirements
  • Environmental conditions (extreme temperature, corrosive conditions, space limitations)
  • Space Limitations (maximum outside diameter and overall length for the coupling)

Sier-Bath Gear Type Couplings

Lovejoy/Sier-Bath gear couplings are stocked in a wide assortment of configurations including C and F standard hubs and sleeves, Mill Motor hubs, Vertical Style, Floating Shaft, and Spacer designs. Continuous and flanged sleeve gear couplings are known for applications involving extended distances between shaft ends, mill motors, and limited end float situations. Nylon sleeve gear couplings are known for their effectiveness in motor/generator sets, motor/pump sets, and other light-duty industrial settings.

HercuFlex Gear Couplings

HercuFlexHercuFlex gear couplings offer 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.

Key features include 1.5 degrees 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.

Grid Couplings

Grid couplings reduce vibration by as much as 30% and cushions shock loads to safeguard driving and driven equipment. The flexible nature of the spring-like grid absorbs impact energy by spreading it out over time and 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.

Disc Couplings

Lovejoy has developed an innovative disc pack profile that is used in all Lovejoy disc coupling products and can accommodate 1/2 to 1-1/2 degrees of angular misalignment. These disc packs are manufactured using high grade stainless steel (AISI-301), ensuring high strength, high endurance to fatigue, and resistance to most environmental conditions.

Torsional Couplings

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).

Specialty Products

Universal Joints (U-Joints)

Lovejoy has been manufacturing universal joints for more than 50 years. The unique shape of the yoke is a special feature which results in exceptionally high strength, while allowing full and free movement of the joint. This accounts for the high horsepower capacity at high speeds.

Variable Speed Drives

Variable speed drives are used because many applications operate at different speeds due to surrounding conditions. Revolutions per minute (RPM) of the driven shaft need to be increased or decreased when there are changes in conditions such as load fluctuations, application requirements, or other circumstances.

Shaft Locking Devices

Shaft locking devices connect hubs solidly to shafts using a keyless mechanical interference fit. This interference fit utilizes screw tension converted into radial pressure via an inclined plane. This pressure expands the shaft locking device to eliminate the gap between the hub and the shaft. The friction bond between the shaft locking device and the shaft/hub is used to create a zero backlash connection that is easily releasable to remove the interference fit.

RunRight Rubber Suspension

RunRight rubber suspension units are designed for use in countless applications that require a torsional spring feature with angles of operation of +/- 30 degrees. When using these units in an application, the torsional force that is applied as well as the radial, axial and/or cardanic forces need to be taken into consideration when sizing a unit.

Hydraulic Components

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