LORD Dynaflex® Bushing-Type Couplings accommodate misalignment, cushion torsional shock, and do not generate or transmit noise. Since relative motion is taken in the elastomer rather than sliding metal surfaces, no lubricant is involved or ever required. Dirt and grit cannot effect the coupling bushings. The elastomer has been compounded to provide long service life.
Typical applications include driveline installations where multi-directional misalignment must be accommodated and torque loads are medium to high.
Specification, selection and dimension information provided on the following pages facilitate design of the coupling assembly. The bushings are standard parts, and the flanges can be supplied by the end user or by Parker Lord as a special design.

Compression bushing-type couplings are assembled by pressing the elastomeric bushings into sockets of a coupling flange. Once assembled, the coupling can be used two ways:
• Parallel Arrangement
The driving shaft can be connected to all of the bush¬ings, and the driven shaft connected to the coupling flange. This arrangement loads all bushings in parallel and produces maximum torque capacity and a less resilient coupling.
• Series Arrangement
This arrangement requires an even number of bush¬ings per flange. Mating flanges of the driving and driven shafts are attached to alternate bushings. This arrange¬ment transmits the torque through the bushings in an N x N series arrangement, thereby making the torque capacity one-half of the parallel arrangement. The coupling is also more flexible.
When high torque and small space are the controlling factors, the parallel arrangement is recommended. When misalignment is the controlling factor, the bushings should be applied in series arrangement.

Torsional Flexibility
Bushing-type couplings are relatively stiff torsionally compared to other elastomeric couplings. The torsional spring rate of a coupling assembly can be calculated by using the equation and data provided on the curves.