What are Lovejoy couplings used for?

Lovejoy couplings require no lubrication and are ideal for medium, light & heavy duty internal combustion power transmission and electrical motor applications. They are used for industrial equipment like blowers, compressors, gear boxes, pumps, mixers and conveyors.

What is a spider in a coupling?

Lovejoy jaw couplings are composed of three parts, i.e. an elastomer insert known as a spider and two metallic hubs on both the sides. These three separate parts are pressed together with the help of a jaw from each hub, both of which are fitted alternately with the lobes of the spider to form a Lovejoy spider coupling.

Which company owns Lovejoy Inc.?

The Timken Company, the global leader of bearings and power transmission products, owns Lovejoy.

What is the difference between open centre & solid centre Lovejoy spider designs?

The open centre design of Lovejoy coupling spiders is suitable in close BE situations (distance between ends of driven and driving shafts), where units must be positioned as closely together as possible. However, this design has no full-diameter support, as the spider's legs are joined only by a thin segment of material. It has speed limitations up to 1750 rpm for NBR and 3600 rpm for Urethane / Hytrel. The solid centre design of Lovejoy spiders is suitable for general power transmission applications where the BE dimension will remain fairly constant and will be capable of affording a suitable gap.

What is the significance of the colours of Lovejoy spiders?

Black - Lovejoy spiders with 80 Shore A hardness ensuring excellent damping properties. Yellow - Spiders with 92 Shore A hardness used in hydraulic applications. Red - Lovejoy coupling spiders with 95 / 98 Shore A hardness suitable in high torque applications. Green - Lovejoy spiders with 64 Shore D hardness for humid environments. Blue - Lovejoy spiders with 92 & 95 Shore A hardness for chemical resistance and high torque capabilities. Tan / Bronze - Lovejoy coupling spiders with 55 Shore D hardness to ensure excellent chemical resistance.

How do you install a spider coupling?

Before installing the hubs on the shaft, slide the retaining collar onto either shaft. Insert the key into the keyway. Make sure that the key fits snugly in the keyway, with minimal side to side movement. Slide a hub on each of the shafts over the keys and align the face of the hub with the end of the shaft. Using a calibrated torque wrench, tighten the set screws. Check alignment using either straight edge method or a dial indicator taking measurements at four locations 90 degrees apart. Wrap the spider (in case of jaw in-shear units) around the hubs and insert a leg of the spider into each space between the coupling jaws. Align the pins on the side of the collar with the grooves in the spider. Recheck set screws for tightness and recheck the axial & angular alignment for accuracy. Remove any material and tooling away from the coupling and shafts. Install the appropriate coupling guard as per OSHA requirements. For a clear Lovejoy spider coupling installation manual, check out the following link: https://www.youtube.com/watch?v=I0D0nrwzzm0

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LOVEJOY Snap Wrap, Flexible Spiders

Lovejoy snap wrap spiders are used for positive torque transmission between two shafts and to protect components from damage by dampening vibrations & shocks and preventing misalignment. Wrap spiders are the key determinant of the torque rating of jaw couplings and perfectly respond to temperat...ure regulations, vibration, misalignment, chemicals, space limitation & high speeds.Read more

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Style	Model	Coupling Size	Material	Torque	Coupling TYPE	Style	Color	Angular Misalignment	Shore Hardness	Price (ex. VAT)
A	68514428284	L190	Urethane	2592 in.-lbs.	Jaw	Solid Ring	Blue	1°	55D, L050 - L110, 90 - 95A, L150 - L233	€192.72
A	68514426093	L225	Urethane	3510 in.-lbs.	Jaw	Solid Ring	Blue	1°	55D, L050 - L110, 90 - 95A, L150 - L235	€201.18
A	68514412413	LT225	Urethane	3510 in.-lbs.	Jaw	Solid	Blue	1°	55D, L050 - L110, 90 - 95A, L150 - L236	€221.07
B	68514411071	SW090, SW095	SOX (NBR) Rubber	144 in.-lbs.	Jaw	Snap Wrap without Ring	Black	1°	80A	€31.72
B	68514424669	SW090, SW095	SOX (NBR) Rubber	144 in.-lbs.	Jaw	Snap Wrap with Ring	Black	1°	80A	€53.90
B	68514424670	SW099, SW100	SOX (NBR) Rubber	318 in.-lbs.	Jaw	Snap Wrap with Ring	Black	1°	80A	€74.03
B	68514411495	SW099, SW100	SOX (NBR) Rubber	318 in.-lbs.	Jaw	Snap Wrap without Ring	Black	1°	80A	€51.89
A	68514441170	SW099, SW100	Urethane	477 in.-lbs.	Jaw	Solid Ring	Blue	1°	55D, L050 - L110, 90 - 95A, L150 - L237	€119.16
B	68514411725	SW110	SOX (NBR) Rubber	792 in.-lbs.	Jaw	Snap Wrap without Ring	Black	1°	80A	€66.10
B	68514424671	SW110	SOX (NBR) Rubber	792 in.-lbs.	Jaw	Snap Wrap with Ring	Black	1°	80A	€90.64
C	68514424672	SW150	SOX (NBR) Rubber	1240 in.-lbs.	Jaw	Snap Wrap with Ring	Black	1°	80A	€125.25
C	68514412002	SW150	SOX (NBR) Rubber	1240 in.-lbs.	Jaw	Snap Wrap without Ring	Black	1°	80A	€74.52
B	68514424673	SW190	SOX (NBR) Rubber	1728 in.-lbs.	Jaw	Snap Wrap with Ring	Black	1°	80A	€221.10
B	68514412275	SW190	SOX (NBR) Rubber	1728 in.-lbs.	Jaw	Snap Wrap without Ring	Black	1°	80A	€88.11

Snap Wrap, Flexible Spiders

Lovejoy snap wrap spider couplings provide shaft-to-shaft connection for power transmission and accommodating parallel & angular misalignment in industrial machinery, electric motors & compressors. These jaw couplings feature radially removable elastomeric cushions for ease-of-maintenance and no metal to metal contact for wear minimisation. SOX (NBR) rubber / urethane construction provides resistance against oil, sand, dirt, grease & moisture while ensuring fail-safe operation, even upon elastomeric cushion failure. These snap wrap spiders are capable of delivering torque up to 3510 inch-lb and the collar configuration of these snap wrap spiders can achieve the same speed as standard couplings since the collar is attached to one hub. Raptor Supplies, a trusted distributor of Lovejoy snap wrap spiders, also offers coupling spacers, jaw couplings, sleeve gear couplings, gaskets, hydraulic tanks and related accessories.

Uses

Lovejoy snap wrap spider couplings offer a wide combination of features, making them useful for low to medium power applications in the power generation, wastewater, aggregate, food & beverage, pulp & paper, steel and marine industries.

Working Mechanism

Lovejoy CJ Series coupling hubs are connected with these Lovejoy snap wrap spiders to form couplings. In jaw couplings, the elastomeric elements are compressed between the jaws of the mating hubs. These connected jaws operate in the same plane as the driving hub jaws that are pushed towards the driven hub jaws. The legs of the elastomeric Lovejoy spiders ensure transmission and are capable of cushioning the force between the driven and the driving jaws by being compressed between them.
The curved jaw hubs are press-fit into the spider to allow the coupling to operate with zero backlash. The curved jaw profile of these wrap spiders helps eliminate deformation and limits the effects of centrifugal force during high speed operations. To ensure full angular misalignment capabilities, raised contact points are added to the spider limbs to maintain proper spacing between the coupling hubs and the spiders.

Features

Lovejoy snap wrap spider couplings are designed to transmit torque between two shafts, thereby reducing the risk of misalignment in industrial machinery, electric motors & compressors.
These flexible snap wrap spiders permit close shaft separation up to the hub's maximum bore size.
They have urethane or SOX (NBR) rubber construction ensuring excellent abrasion resistance and protection against dirt, chemicals, oil, sand, grease & moisture.
These snap wrap spiders deliver a maximum speed of 1750 rpm via retaining rings.
The snap wrap design of these spiders allows easy removal of the units without moving the hubs.
These snap wrap spiders are available in blue (55 Shore D & 90 to 95 Shore A - chemical resistance & great torque capabilities) and black colours (80 Shore A - high dampening capacity).

Compatible Accessories

Lovejoy LC type jaw coupling hubs: These hubs feature a fail safe design with no metal to metal contact so that they perform even when the elastomer fails. They are suitable for applications having speeds over 1750 RPM and use a snap wrap spider & retaining ring.
Lovejoy SW type jaw coupling hubs: These hubs are used for L type couplings with a snap wrap elastomer & retaining ring. These coupling hubs provide standard shaft to shaft connection in heavy-duty industrial applications having speeds under 1750 RPM.

Standards and Approvals

Lovejoy jaw coupling spiders are designed to comply with ISO 9001:2008 international standards for efficient performance.

Installation

The flat-strip, open-end design of snap wrap spiders connects the spider legs around the perimeter of the coupling rather than at the centre, allowing easy removal or installation without disturbing the alignment of either coupling hub. Without centre connections, this design does not overlap into the bore, therefore shaft ends are allowed to extend at the maximum bore diameter to a minimal distance between the ends of the driving and driven shafts. Radially wrapped around the jaws, these snap wrap spiders must be held in place by either a ring or a collar. When retained by a ring, they have a maximum speed limit of 1750 rpm and when retained by a collar, the normal speed of the coupling applies.