When a man looks into a mirror, the image reflects who he is today. But it also reveals who he used to be. Although appearances change, many of the underlying characteristics remain the same. The same is true with Gear Technology, as we celebrate our 20th anniversary and reflect on who we are.
This article was originally published 20 years ago, in Gear Technology’s first issue. It describes a method of
evaluating the smoothness, or lack of smoothness, of gear motion. This lack of smoothness of motion, known as
“transmission error,” is responsible for excitation of gear noise and problems of gear accuracy and sometimes has a relationship to gear failure.
As the international business community grows closer together, the
need for understanding differences between national and international
gear rating standards becomes increasingly important for U.S. gear
manufacturers competing in the world market.
The aim of our research is to clearly show the influence of defects on the bending fatigue strength of gear teeth. Carburized gears have many types of defects, such as non-martensitic layers, inclusions, tool marks, etc. It is well known that high strength gear teeth break from defects in their materials, so it’s important to know which defect limits the strength of a gear.
Flexibility and productivity are the keywords in today’s grinding operations. Machines are becoming
more flexible as manufacturers look
for ways to produce more parts at a
lower cost. What used to take two
machines or more now takes just one.
For a high-speed gearbox, an important part of power losses is due to the mesh. A global estimation is not possible and an analytical approach is necessary with evaluations of three different origins of power losses: friction in mesh contact, gear windage and pumping effect between teeth.