When Hach Company engineers were designing the driveline of the Sigma SD900 Sampler, an all-weather device for the National Pollutant Discharge Elimination System (NPDES) and waste water treatment plant (WWTP) process control, they needed a compact, zero backlash coupling to be positioned between the motor and a peristaltic pump. Coupling, size, vibration damping characteristics, and maintenance-free features were important factors in the decision making process. The SERVOMAX elastomer jaw couplings from R+W Coupling Technology suited the application well.
The Sigma SD900 water sample unit is easy to set up and program, delivering reliable results and reduced maintenance.
The unit has an outside diameter of 25 mm and an overall length of 26 mm, making it a good fit for the allowable installation space. Another important characteristic was the ability to damp vibration while compensating for misalignment. Hach engineers selected the elastomer insert with an 80 Sh A hardness to maximize these features. Once installed within the given technical parameters, the highly repeatable, SERVOMAX elastomer jaw couplings are wear and maintenance free.
All couplings undergo a calibration process in which a secondary heat treatment of the injection molded, polyurethane insert is used to smooth out inconsistencies in the driving surfaces, allowing for a smooth fit and high level of repeatability. The couplings compensate for all types of shaft misalignment while damping vibration and maintaining a backlash free performance.
The SERVOMAX model EKL elastomer jaw coupling allowed Hach engineers to design a shorter housing resulting in as compact a design as possible.
Offered in three different Shore hardnesses, you can select the correct amount of flexibility, vibration damping, or stiffness depending on the application. Their high torque density and reasonable cost makes them ideal for aggressive applications within a confined space.
R + W Coupling Technology
www.rw-america.com
::Design World::
Filed Under: Couplings, MECHANICAL POWER TRANSMISSION