Lovejoy, Inc. : Products : Jaw In Shear Couplings

Jaw In-Shear Type Couplings

Lovejoy has developed an entirely new elastomer version which can be used with our standard Jaw Coupling hubs.

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.

Click below for the appropriate Jaw In-Shear Type Coupling Catalog.

Inch Version
Metric Version

The Jaw In-Shear Spider is radially removeable, 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).

General specifications of the Lovejoy Jaw In-Shear Coupling are:

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)

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.