Lovejoy (by Timken) – Flexible Shaft Couplings
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Since entering the power transmission marketplace in the 1920s, Lovejoy has emerged as an international market leader and is recognized as the premier supplier of flexible shaft couplings. Lovejoy created the industry standard Jaw-style coupling in 1927, and was the first to incorporate rubber-in-compression as a power transmission concept.
Lovejoy purchased Curtis Universal Joints in 2016, expanding the Universal Joint product line. In the same year, Timken acquired Lovejoy, and in 2017 Timken acquired Torsion Control Products. Timken combined these coupling-focused organizations in 2019.
Jaw Type Couplings
Lovejoy Jaw type couplings are offered in the industry’s largest variety of stock bore/keyway combinations. They require no lubrication and provide 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, with torque ratings from 3.5 in–lbs (0.4 Nm) to 170,004 in–lbs (19209 Nm), and a bore range of 0.125 in. (4.45 mm) to 7 in. (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 include NBR SOX rubber, Urethane, Hytrel, and Bronze).
Jaw In-Shear Type Couplings
The jaw in-shear coupling is non-fail safe, and 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 and aligned axially. The wider spider is 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, 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, and 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 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 coupling configurations include 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 with extended distances between shaft ends, mill motors, and limited end float situations. Nylon sleeve gear couplings are effective in motor/generator and motor/pump sets and other light-duty industrial settings.
HercuFlex Gear Couplings
HercuFlex gear couplings offer increased nominal torque, larger maximum bore size, longer service life, and still utilize 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 (FX, CX, FXL), improved fastener corrosion resistance, and advanced seal design for contamination resistance.
Grid couplings reduce vibration by as much as 30% and cushions shock loads to safeguard driving and driven equipment. The flexible 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 between the curved profile of the hub teeth and the flexible grid.
Lovejoy’s innovative disc pack profile in 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 environmental conditions.
Lovejoy torsional couplings are engineered to solve torsional vibration problems in applications such as diesel engine driven equipment, internal combustion engines, reciprocating pumps and compressors, and variable frequency drives (VFDs).
Universal Joints (U-Joints)
Lovejoy has been manufacturing universal joints for more than 50 years. The unique shape of the yoke results in exceptionally high strength, while allowing full and free movement of the joint. This accounts for the high horsepower capacity at high speeds.
D TypeNeedle Bearing TypeU-Joint Boots
HD TypeLOJ & JR-4 Types
D303 Stainless SteelDD & DDX
Variable Speed Drives
Lovejoy variable speed drives are used to accommodate applications operating at different speeds due to surrounding conditions. Revolutions per minute (RPM) of the driven shaft are increased or decreased when there are condition changes such as load fluctuations, application requirements, or other circumstances.
Econoline SeriesHi-Ratio SeriesCompanion Sheaves
Aluminoline SeriesAdjusta-Sheave SeriesHexadrive Variable Speed Drives
WB SeriesAdjustable Motor Bases
Shaft Locking Devices
Lovejoy shaft locking devices connect hubs to shafts using a keyless mechanical interference fit, which utilizes screw tension converted into radial pressure via an inclined plane. This pressure expands the shaft locking device to eliminate the gap between hub and shaft. The friction bond between the shaft locking device and the shaft/hub is used to create a zero backlash connection that is easily released to remove the interference fit.
SLD 900 Metric (External)
SLD 1500SLD 1900
SLD 1750SLD 2600
SLD 1850SLD 350 Solid/Split Ring
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.