Due to the recent 4th industrial revolution and explosive interest in smart factories, the demand for industrial robots and related technologies is rapidly increasing. In order to develop a precision reducer for robots, a measurement technology of the small teeth of a gear is very important. This paper developed a method to measure the tooth shape of a precision harmonic reducer for robots and to evaluate the tooth shape measurement error quantitatively. The tooth shape of the flexspline of a harmonic drive was measured using three instrumental devices: a stylus, a projector, and a laser line scanner. A mathematical tool was also developed to evaluate the error by comparing the designed and measured teeth. The measured tooth profile was quantitatively assessed with maximum, average, and root mean square error. The measurement method using a stylus has disadvantages of careful measurement effort and a small measuring range. However, it has better precision. On the other hand, the projection method shows a moderate performance without much effort during measurement.
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The Prediction of the Angular Transmission Error of a Harmonic Drive by Measuring Noncontact Tooth Profile and Considering Three-dimensional Tooth Engagement Beom-Seok Kim, Seung-Tae Jeong, Hyeong-Joon Ahn International Journal of Precision Engineering and Manufacturing.2023; 24(3): 371. CrossRef
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.
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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
Gears have been used as primary machine elements that comprise a power transmission system in many mechanical engineering fields. This paper presents research on the optimization of gear geometries. Drive unit consists of many spur gears in inner structure, and efficient alignment will be needed for fine performance of the unit. If mesh misalignments occur, load distribution would be unbalance and concentrated in one side. It is directly connected many problems such as banding deformation to shaft, gear and housing. As much as deformation occur these machine element’s duty cycle will be decreased. Moreover due to unbalanced load distribution, noise and transmission error cause serious defect on gear performance. In order to solve this matter, it is necessary to modify tooth profile for balanced load distribution. There are two different solutions. One is micro-geometry optimization and the other is macro-geometry optimization. In this paper we choose the first one because it just takes minimum gear modification but more effective. To implement this, the latest simulation technology will be used and it allows not only the defection of gear mesh misalignments but also how to modify gear profile and lead slope. Before make prototype gear production, it provides more helpful information.
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Influence of Open Differential Design on the Mass Reduction Function Mirko Karakašić, Pejo Konjatić, Hrvoje Glavaš, Ivan Grgić Applied Sciences.2023; 13(24): 13300. 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
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
A Review of Recent Advances in Design Optimization of Gearbox Zhen Qin, Yu-Ting Wu, Sung-Ki Lyu International Journal of Precision Engineering and Manufacturing.2018; 19(11): 1753. CrossRef
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