Abstract
The gear smoothness in the transmission of power mainly depends on the contact ratio. When the contact ratio is higher, the load shared by the pair of teeth in mesh will be lower. In the helical gear, the additional contact ratio is created due to face advance which is called face contact ratio and it provides the higher contact ratio than that of spur gear. The face contact ratio can improve by changing the few parameters such as helical lead and face width. In the present work, the face contact ratio is improved by altering those parameters and their effects on the load sharing based fillet stress are also determined for one mesh cycle in the asymmetric helical gear designed through direct design procedure using finite element method.
Highlights
The modern power transmission industries are needed an optimum design of high quality gears such as to have high load capacity, longer life, low weight and size
The load sharing based maximum fillet stress analysis of helical gears with asymmetric teeth designed through direct design method is considered to be an effective method as it leads to the better one than the other methods
Several attempts have been made so far on stress analysis of symmetric and asymmetric spur gears but only a few are available on fillet stress analysis of asymmetric helical gears
Summary
The modern power transmission industries are needed an optimum design of high quality gears such as to have high load capacity, longer life, low weight and size. The load sharing based maximum fillet stress analysis of helical gears with asymmetric teeth designed through direct design method is considered to be an effective method as it leads to the better one than the other methods. Direct gear design method is one of the most effective gear design approaches than the conventional method which provides the high performance gears without concern for any predefined tooling parameters In this method, the pinion and gear are designed by using area of existence for a given pinion teeth number, speed ratio, coefficient of asymmetry and top land thickness coefficient. Rama Thirumurugan and Muthuveerappan (2010) had presented a method to calculate the maximum fillet stress based on load sharing ratio in NCR gears using SPLM of spur gear for different gear parameters. In the present work, the load sharing ratio and the respective maximum fillet stress are determined for one mesh cycle in the asymmetric helical gears designed through direct designed method.
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