jbj Techniques Ltd; an excellence in engineering

Spider / jaw couplings compensate for parallel, angular and axial displacements.

(curved and straight jaw types)

Spidex ® mechanical power transmission couplings are torsionally flexible shaft couplings, the operating characteristics of which are two hubs with concave claws, transmitting the torque by meshing with an elastic involute gear ring.
torsionally flexible spider couplings or jaw couplings
Large stocks for quick delivery and in-house machine shop for exact fit to your application machinery.
Telephone: +44 (0)1737 767493 or email: info@jbj.co.uk
The flexibility of the drive ring allows the power transmission coupling to compensate for parallel, angular and axial displacements.

Maximum shaft diameters of 145 mm can be accommodated with maximum torques up to 15,000 Nm and maximum speeds of 19,000 rpm.

Torsional elasticity
Dampening
Blind assembly
Safe against break-down
No maintenance
Hub material: Aluminium (Al), Cast Iron (GG/GGG), Sintered Steel (Si), Steel (St).
The important information you need for these spider / jaw type mechanical power transmission couplings: below you will find~
» Service factors (link).
» Displacement values (link).
» Torque ratings (link).
» Increase the life of your spider coupling elements (link).

Spidex power transmission couplings are torsionally flexible shaft couplings, the operating characteristics of which are two hubs with concave claws, transmitting the torque by meshing with an elastic involute gear ring.

The spider coupling concept gives a reliable, smooth power transmission without torsional oscillation / vibration and so protects the connected machinery.

Due to the complete flexibility and ductility of the elastomer ring, it compensates for parallel and angular displacements as well as to absorb longitudinal movement of the shafts.

The involute teeth of the elastomeric inserts are crowned in order to avoid edge pressure on the tooth flanks and so avoid undesirable axial thrust. The puncture proof spider coupling can be loaded extremely high since the elastic elements are submitted to compression and not to bending moments of force. The elastomer gear ring, made of a newly developed Simirit-Polyurethane of various degrees of shore hardness, has important advantages in comparison with the standard polyurethanes. It is non-ageing, with resistance against hydrolysis (can be used in tropical conditions), non-abrasive, has a high self-damping effect and is also resistant to oil and ozone. It can be used with temperatures ranging from -400 °C to +1000 °C.

Spidex power transmission couplings can be used for horizontal as well as for vertical shaft connections, for reversing, intermittent service and are electrically insulating. The operating characteristics and the durability of the coupling are very positively influenced by the high overall precision of the machining, especially the claws, unbalance is reduced to a minimum, running is improved and service life considerably increased.

Scroll down this page for specification catalogues (link) for straight jaw spider couplings and jaw in-shear type couplings.

Application service factors for the Spidex® coupling

Spidex coupling application service factor K1 table
Spidex coupling application service factor K2 tableSpidex coupling application service factor K3 table
Total service factor for K = K1 x K2 x K3

Displacement values for the Spidex® coupling

Valid for 1500 rpm and for a given temperature range -25°C to +30°C.
For other speeds and temperature ranges please contact jbj Techniques technical office, tel: +44 (0)1737 767493 or email: info@jbj.co.uk
spider coupling displacement diagram, 1 of 4
spider coupling displacement diagram, 2 of 4
spider coupling displacement diagram, 3 of 4
spider coupling displacement diagram, 4 of 4
jaw coupling displacement data table

Torque ratings for the Spidex® coupling

* For peripheral speeds of over V = 30 m/s it is necessary to use either steel or SG iron. Dynamic balancing is also necessary.

** When using 64 shore hardness spider, steel and modular iron hubs should be used.

92° shore spiders (white) will normally be supplied unless otherwise specified.
jaw coupling data table including dynamic torsional stiffness, torque, max speed, shore hardness, etc.
NOTE: Due to their complexity the tables above may not display well on small, mobile devices.
Increase the life of your spider coupling elements / jaw coupling elements. Get more out of your elastomeric spider by spinning it. When the spider begins to wear, just pull it away from the jaws and advance it around one leg. Only every other leg will show signs of wear because just three of the legs transmit torque. This does not apply if you have a reversing application where the coupling is subject to rotational work, spun in both directions.
Specification of spider couplings found in this on-line » catalogue « link
Questions?

Contact
jbj Techniques Limited
for friendly help and advice
telephone: +44 (0)1737 767493
email:
happy to help at jbj Techniques Limited, quality products for mechanical and fluid power
Also: Specification of straight jaw spider couplings found in this on-line » catalogue « link
And: Specification of jaw in-shear couplings found in this on-line » catalogue « link
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