Influence of Wheel Flat Scars on High-speed Train Transmission Geer Dynamic Characteristics

Abstract

Objective Wheel flat scars can exacerbate the vibration of train transmission gears. Therefore, it is necessary to study the impact of wheel flat scars on the vibrational dynamic characteristics of high-speed train transmission gears. Method Based on multi-body dynamics theory and transmission gear technical parameters of a certain high-speed train, a dynamic model of the entire high-speed train, including coupled helical gears in bending-torsional-axial direction and wheel flat scars, is constructed. For flat scars of different lengths, the dynamic characteristics of high-speed train transmission gears, the maximum contact stress between large and small gear contact surfaces, and gear transmission errors are calculated and analyzed. Result & Conclusion When the lengths of wheel flat scar range from 0 to 30 mm, the vibration acceleration of large and small gears in high-speed train increases insignificantly; when the above lengths range from 30 to 60 mm, the vibration acceleration increases sharply, and the maximum contact stress between large and small gears increases from 630 MPa to 1 250 MPa, doubling by 2.08 times. As the length of wheel flat scars increases, the dynamic gear transmission error shows an increasing trend. When the length is 0, the maximum value of gear dynamic transmission error is 9 μm，and when the length is 60 mm, the maximum gear dynamic transmission error is 72 μm, increasing by 8 times.

Keywords

• high-speed train
• wheel flat scar
• transmission gear