SPIRAL BEVEL GEAR DESIGN AND DEVELOPMENT - GENERATION AND SIMULATION OF MESHING BY METHOD OF CUTTING SPIRAL BEVEL GEARS
Keywords:
spiral bevel gears, tooth surface generation strategy, local synthesis, tooth contact analysis, transmission error optimization.Abstract
Automobile spiral bevel gears are often generated by spiral generated modified (SGM) roll method. Therefore pinion tooth surface modified generation strategy has an important influence on the meshing and contact performances. To obtained proper contact pattern and balanced transmission error, local synthesis is applied to obtain the machine tool settings of pinion. For computerized machines, various tooth surface generation styles of pinion are proposed. Here tooth contact analysis (TCA) is applied to obtain contact pattern and balanced transmission error. For the difference between TCA transmission error and design objective curve, the degree of symmetry and agreement are defined and the corresponding sub objective functions are established. Scalar weighted combination method is applied to get an equivalent objective function to evaluate the shape of transmission error constant. The computer programming for this process is developed to analyze the meshing performances of the pinion tooth surface generation styles for a pair of automobile spiral bevel gears with 08/43 teeth numbers. The analytical results are compared with each other and show that the incomplete modified roll is optimal for this gear pair. This study is an expansion to generation strategy of spiral bevel gears, and offers new alternatives to computer numerical control (CNC) manufacture of spiral bevel gears.
The reduction of transmission error has been the main focus of many investigations regarding noise minimization. Profile modifications are often used in the case of spur gears where special modification shapes can reduce the transmission error to a minimum even for a wide load range. In the case of helical gears, an integer face contact ratio is often used to minimize transmission error and hence noise. But gears designed in this way have not always shown the intended noise reduction because the transmission error is not the only excitation source. In fact, the importance of other excitation sources increases as good design practices bring the transmission error to low levels in case of spiral bevel gears.
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GUPTA, ASHOK KUMAR, and Dr VANDANA SOMKUWAR. "SPIRAL BEVEL GEAR DESIGN AND DEVELOPMENT-GENERATION AND SIMULATION OF MESHING AND TOOTH CONTACT ANALYSIS (TCA)." INTERNATIONAL JOURNAL OF INNOVATION IN ENGINEERING RESEARCH & MANAGEMENT ISSN :2348-4918 VOLUME :01 Issue 02 I Paper id-IJIERM-I-I I-1153 ,April 2014
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