Jaw Coupling Spiders help to dampen shock between coupling hubs and accommodate small amounts of angular, parallel, and axial misalignment. A complete assembly requires one spider and two hubs.
Some common Spiders used are Nitrile Butadiene Rubber(NBR), Urethane, Hytrel.
Nitrile butadiene rubber (NBR). Sometimes called Buna N, this is the most economical and widely used coupling element material. It resembles natural rubber in resilience and elasticity, plus resistance to oil, hydraulic fluid, and most chemicals. Its operating temperature ranges from 240 to 212 F. NBR provides the best damping capability among elastomeric elements.
Urethane. This material has 1.5 times the torque capacity of NBR with very good chemical and oil resistance, but less damping capability and a narrower operating range of 230 to 160 F. Urethane is a good choice where an application calls for high torque in a confined space, or resistance to atmospheric effects such as ozone, sunlight, and hydrolysis in tropical conditions. Its cost is 1.5 to 2 times that of NBR.
Mechanical Power Transmission Products V Groove Pulleys V belts Jaw Coupling Gear Coupling Spider Sprocket Chains Oil Seals Bearing.
