The input shaft of gearbox usually bears a cyclic variation of torque, which may lead to the risk of experiencing a fatigue fracture. To evaluate the fatigue life accurately and identify the weak parts, the ANSYS is used to simulate the torsional fatigue of the input shaft for the gearbox, and the fatigue life of the weak part is obtained, which is then tested and verified by the torsional fatigue testing in the MTS torsional fatigue test rig. The test results show that the maximum difference is 14% between the calculated life and the testing results, indicating that the simulation value can reflect the actual fatigue life accurately. Notably, the cracks appear in the large oil holes, and its life is mainly concentrated in the crack initiation stage, accounting for 99.2% of the total life. The analysis results show that the fatigue life of the software simulation has the guiding significance for the life evaluation. The fatigue life of the shaft can be quickly calculated by the simulation to reduce the number of fatigue tests and achieve cost-effectiveness.
Noise, Vibration and Harshness (NVH) is a comprehensive issue of manufacturing quality that gives the purchaser a superficial feeling. The NVH performance of the vehicle has undoubtedly become an important factor and basis for consumers. When the internal combustion engine is working, it generates a strong noise thus making it necessary to reduce the vibration and noise. The noise of diesel engine is divided into acoustic and structural radiation noise according to different radiation paths. The structure radiated noise is mainly caused by the combustion noise and mechanical transmission noise, while mechanical transmission noise is mainly generated by the meshing gears in the diesel. This paper aims to solve the problem of a diesel engine abnormal gear whine noise under idling conditions with a combination of simulation and experiment. By gear micro-modification, the gear train whine noise is reduced by minimizing the PPTE of the gear train. The comparison of the simulation to benching testing shows a good correlation. It provides an optional solution to the modification proposal of the engine gear train, which uses the similar structure for the engine. Future work will dwell on a better understanding of the gear rattle noise, which will be discussed later.
Nowadays, noise, vibration, and harshness (NVH) is a comprehensive issue related to manufacturing quality, it gives the purchaser the most direct and superficial feeling. Following economic development, the improvement of people’s living standards, and the expansion of the export market, it has become urgent to develop and produce some better NVH performance motorcycles. In this paper, the transmission of a scooter gearbox is modeled and analyzed by software. Then, the first helical gear pair of the gearbox was investigated through static analysis. Lastly, optimized modification was verified using B&K testing equipment in the semi-anechoic room. The comparison of the simulation to prototype during testing showed a good correlation, which means simulation optimization can greatly improve the research and development efficiency of the transmission system.
Citations
Citations to this article as recorded by
A Study on the Optimum Design of Planetary Gear Train for Air-Starting Motor Nam-Yong Kim, Seong-Bae Park, Sung-Ki Lyu Journal of the Korean Society of Manufacturing Process Engineers.2022; 21(12): 135. CrossRef
Performance Test for a Multi-stage Planetary Gear Module in a Hydraulic Winch Kyu Tae Park, Young Rak Yoo, Jong-Hak Lim, Sung-Hoon Kim, Ho Seong Lee, Chul Ki Song Journal of the Korean Society of Manufacturing Process Engineers.2020; 19(10): 31. CrossRef
A Study on the Optimal Design of Drive Gear for Transfer Gearbox MyeongJin Song, MyeongHo Kim, Zhen Qin, DongSeon Kim, NamSool Jeon, SungKi Lyu Journal of the Korean Society for Precision Engineering.2019; 36(2): 121. CrossRef
Study on the Reduction of Gear Whine Noise in Diesel Engine Gear Train Qi Zhang, Yong Bo Wang, Jian Hua Lv, Zhong Gang Zhu, Zhen Qin, Sung Ki Lyu Journal of the Korean Society for Precision Engineering.2019; 36(9): 867. CrossRef
The aim of this study is to design the gearbox of an electric vehicle using the rear-wheel drive. The gearbox is a set of revolving gears and shafts based on programmed torque and rotations per minute (rpm). In this case, safety, strength and durability of gears and shafts was considered. In the narrow vehicle, a light case is used. In addition to gear safety and deflection, the weight of the vehicle was reduced. The electric vehicle reducer gearbox was modeled according to the vehicle room. The strength analysis was conducted using finite element method (FEM). After analyzing the strength using FEM to verify stress distribution, the design was modified, and compared with the results of altered design using FEM. As a result, the reducer gearbox of electric vehicle was designed according to incorporate gear safety, deflection of each gear, durability, and analysis of finite elements followed by test assessment, vehicle installation and the production of real parts.
Citations
Citations to this article as recorded by
Sensitivity Analysis on Driving Characteristics According to Change in Gear Ratio of a Front Wheel Drive Electric Vehicle Young-Kap Son, Jeong-Min Kim Journal of the Korean Society of Manufacturing Process Engineers.2022; 21(9): 50. CrossRef
A Study on the Optimum Design of Planetary Gear Train for Air-Starting Motor Nam-Yong Kim, Seong-Bae Park, Sung-Ki Lyu Journal of the Korean Society of Manufacturing Process Engineers.2022; 21(12): 135. CrossRef
Simulation and experimental study on lubrication of high-speed reducer of electric vehicle Fuchun Jia, Yulong Lei, Xianghuan Liu, Yao Fu, Jianlong Hu Industrial Lubrication and Tribology.2021; 73(3): 500. CrossRef
Study on the Reduction of Gear Whine Noise in Diesel Engine Gear Train Qi Zhang, Yong Bo Wang, Jian Hua Lv, Zhong Gang Zhu, Zhen Qin, Sung Ki Lyu Journal of the Korean Society for Precision Engineering.2019; 36(9): 867. CrossRef
A Study on the Optimal Design of Drive Gear for Transfer Gearbox MyeongJin Song, MyeongHo Kim, Zhen Qin, DongSeon Kim, NamSool Jeon, SungKi Lyu Journal of the Korean Society for Precision Engineering.2019; 36(2): 121. CrossRef
A decoupling method for multi-stage gear transmission error Dong Guo, Honglin Li, Yawen Wang, ShuaiShuai Ge, Xuebin Bai Journal of the Brazilian Society of Mechanical Sciences and Engineering.2023;[Epub] CrossRef
Nowadays, lower gear vibration and noise are necessary for drivers in automotive gearbox, which means that transmission gearbox should be optimized to avoid noise annoyance and fatigue before quantity production. Transmission error (T.E.) is the excitation factor that affects the noise level known as gear whine, and is also the dominant source of noise in the gear transmission system. In this paper, the research background, the definition of T.E. and gear micro-modification were firstly presented, and then different transmission errors of loaded torques for the spur gear pair were studied and compared by a commercial software. It was determined that the optimum gear micro-modification could be applied to optimize the transmission error of the loaded gear pair. In the future, a transmission test rig which is introduced in this paper is about to be used to study the T.E. after gear micro-geometry modification. And finally, the optimized modification can be verified by B&K testing equipment in the semi-anechoic room later.
First
Prev
