Hydraulics Online – Supplying you with Lovejoy hydraulics and Lovejoy hydraulic equipment, couplings and components…
Lovejoy Inc entered the power transmission marketplace in the 1920s and today the Lovejoy brand is recognized as a leading supplier of flexible shaft couplings and other power transmission components. Lovejoy hydraulic products include: Lovejoy hydraulic couplings, power transmission, hydraulic pump / motor mounts (bellhousings), BNZ series water-oil coolers, reservoirs and accessories.
The Jaw Type Couplings from Lovejoy Hydraulics 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).
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.
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.
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.
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.
Lovejoy Hydraulics 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 Hydraulics / 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.
The Lovejoy Hydraulics 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.
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 Hydraulics 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.
Lovejoy Hydraulics 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 Couplings are designed to dampen torsional vibrations and tune, or adjust the system’s critical speeds away from the application’s operating range.
Variable Speed Drives and Shaft Locking Devices
Lovejoy Hydraulics offers a full selection of both vertical and horizontal mounting configuration pump / motor mounts in both SAE and Metric pump flanges, and both NEMA and IEC electric motor mounts.