A Method for Static and Dynamic Load Analysis of Standard and Modified Spur Gears,
CLEVELAND STATE UNIV OHIO
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Many advanced technology applications have a general requirement that the power to transmission weight be increased. Engineers, as a result of those requirements, attempt to design gear systems to maximum load capacity. For this purpose the ability to accurately calculate the dynamic loads becomes essential for advanced transmission design. Most of the previously proposed methods are limited to the normal contact ratio NCR gearing and are based on a number of simplifications. The high-contact-ratio HCR gearing is also considered for many applications. However, the number of available methods for analyzing the HCR gearing is very limited. This paper discusses the mesh stiffness and dynamic load characteristics for several cases of the NCR and HCR gearing. The considered contact ratios were grouped in the general range of 1.7, 2.0, and 2.3. In this study the HCR gearing is defined by contact ratios equal to or greater than 2.0. The HCR gearing in this study is represented by a group of small pressure angle, fine pitch, and long addendum gearing.