title: Effects of pressure angle and tip relief on the life of speed increasing gearbox: a case study.
abstract: This paper examines failure of helical gear in speed increasing gearbox used in the wind turbine generator (WTG). In addition, an attempt has been made to get suitable gear micro-geometry such as pressure angle and tip relief to minimize the gear failure in the wind turbines. As the gear trains in the wind turbine gearbox is prearranged with higher speed ratio and the gearboxes experience shock load due to atmospheric turbulence, gust wind speed, non-synchronization of pitching, frequent grid drops and failure of braking, the gear failure occurs either in the intermediate or high speed stage pinion. KISS soft gear calculation software was used to determine the gear specifications and analysis is carried out in ANSYS software version.11.0 for the existing and the proposed gear to evaluate the performance of bending stress tooth deflection and stiffness. The main objective of this research study is to propose suitable gear micro-geometry that is tip relief and pressure angle blend for increasing tooth strength of the helical gear used in the wind turbine for trouble free operation.
authors: Department of Mechanical Engineering, Nehru College of Engineering and Research Centre, Thrissur, India.
authors: Sankar
authors: S
authors: Shanmugasundaram
authors: Department of Mechanical Engineering, Sri Krishna College of Engineering and Technology, Coimbatore, India.
authors: Manivarma
authors: M
authors: Kumaresan
authors: Department of Mechanical Engineering, Government College of Technology, Coimbatore, India.
authors: Nataraj
authors: N
authors: Muthusamy
keywords: ANSYS; Bending stress; Failure analysis; Helical gear; KISS soft; Profile modification; Tooth deflection; Wind turbine gearbox