SUMMER 2019
Distributor's Link Magazine Summer 2019 / Vol 42 No3
Distributor's Link Magazine Summer 2019 / Vol 42 No3
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40<br />
THE DISTRIBUTOR’S LINK<br />
ROTOR CLIP COMPANY INC.<br />
187 Davidson Avenue, Somerset, NJ 08873<br />
TEL 1-800-557-6867 FAX 732-469-7898 EMAIL info@rotorclip.com WEB www.rotorclip.com<br />
BRINGING BALANCE TO THE FORCE - PART 1<br />
by Jürgen Wenzel, Global Marketing Manager<br />
Retaining Ring Solutions to Reduce Noise,<br />
Vibration and Harshness (NVH) for Applications<br />
with High RPMs and Balancing Needs<br />
Bringing balance to forces is not just a fictional<br />
desire in a galaxy far, far away, but a real life challenge<br />
when it comes to developing machinery and equipment<br />
dealing with high rotational speeds (RPMs). Everything<br />
from electric motors, transmissions, and axles to pumps,<br />
turbines, fans, drive shafts, and generators are all<br />
examples of applications that need to run as smooth as<br />
possible in order to be efficient, safe and long-lasting.<br />
Retaining rings are often used in these types of high RPM<br />
applications to fix bearings on shafts or in bores. It is<br />
therefore critical for design engineers to choose rings that<br />
will retain parts effectively and allow assemblies to run at<br />
maximum capacity, while not being negatively impacted<br />
by, or add to, the forces of high rotational speeds and<br />
causes of NVH.<br />
Rotor Clip is a global leader and expert in the<br />
production of retaining rings and has assisted design<br />
engineers for over 60 years with retaining ring solutions<br />
that achieved their ultimate design goals, including the<br />
reduction of noise, vibration, and harshness.<br />
Bowed and Beveled Rings That Combat NVH<br />
Each ring type employs a unique geometry that<br />
addresses unacceptable endplay in its own way. Bowed rings<br />
do not lie in a single plane perpendicular to the assembly<br />
centerline. Their bowed construction lets them act like a<br />
flat spring, offering dynamic endplay take up. By flattening<br />
or rebounding they press the retained part into place. Such<br />
rings are generally used for smaller applications; standard<br />
diameters range from 0.11in to 1.75in.<br />
Beveled rings, on the other hand, are planar but<br />
feature a 15 deg. bevel. This allows them to act like a<br />
wedge between the retained part and the ring groove<br />
wall, rigidly taking up endplay space. Beveled retaining<br />
rings are usually used in larger applications that require<br />
standard sizes between 1 and 10 in. in diameter.<br />
TECHNICAL ARTICLE<br />
EXAMPLE OF ROTORCLIP’S BOWED E RING. PART #BE<br />
THE DIAGRAM ABOVE DEPICTS HOW A BEVELED RING USES ITS<br />
BEVEL TO ACT AS A WEDGE.<br />
Since the function of a beveled ring is based on<br />
the ring’s radial spring force, an external beveled ring is<br />
therefore highly sensitive to RPMs. This force is countered<br />
by high RPMs, such that external beveled retaining rings<br />
installed on rotating shafts lose their end play capability<br />
rather quickly. However, this is not a concern with internal<br />
beveled retaining rings, since the centrifugal forces push<br />
the ring deeper into the groove.<br />
Stay tuned to the Part 2 in this series in the next<br />
issue to learn about Rotor Clip’s product line that work<br />
hard to fight NVH.<br />
ROTOR CLIP COMPANY INC.