The Development of a Gear Tooth Micro Geometry Analysis Method for the Transmission Gear Noise Robustness 2019-01-1414
Transmission error is well known as one of the most important source of transmission gear whine noise. To minimize transmission error in the gear system, various analysis methods have been studied and applied for long time. Many researchers were focused on gear micro geometry to get the low transmission error. But, if the gear was misaligned by several factors such as clearance and manufacturing tolerance error, then the gear noise could rapidly and unexpectedly be increased.
To overcome this problem, this new analysis method has been introduced and developed.
The transmission system analysis model was constructed. it considers various factors including clearance, stiffness and so on. The deformation and vibration characteristics of finite element models were verified by comparison with frequency response function test.
Through the Placket-Burman screening method, the lead slope was founded one of the most sensitive factor for transmission error. Full factorial combination analysis for the lead slope was performed under the various driving conditions. As a result, the transmission error distribution map according to the gear tooth modifications and various torque conditions was introduced to check the stable area. The transmission error map proposed by this analysis could make it easy to find the gear micro geometry tolerance which is robust to misalignment conditions.
After all, vibration distribution of new planetary gear could be reduced by 5dB compared to former transmission. Hyundai-Motor 8th -speed automatic transmission was developed successfully by using this new analysis method.
Jae Hyuk Choi, Hyun Ku Lee, Hyun Seung Suh, Soo Hong Lee