• Title/Summary/Keyword: Gear Quality

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A PC-Based System for Gear Pitch Analysis and Monitoring in Gear Manufacturing Process (기어피치분석 및 공정관측을 위한 PC기반시스템 구축)

  • 김성준;지용수
    • Journal of Korean Society for Quality Management
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    • v.30 no.3
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    • pp.111-119
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    • 2002
  • Gears are essential elements for mechanical power transmission. Geometric precision is the main factor for characterizing gear grade and qualify. Gear pitch is one of the crucial measurements, which is defined as a distance between two adjacent gear teeth. It is well-known that variability in gear pitches may causes wear-out and vibration noise. Therefore maintaining pitch errors at a low level plays a key role in assuring the gear quality to customers. This paper is concerned with a case study, which presents a computerized system for Inspecting pitch errors in a gear machining process. This system consists of a PC and window-based programs. Although the start and stop is manually accomplished, the process of measuring and analyzing pitch data is automatically conducted in this system. Our purpose lies in reducing inspection cost and time as well as Increasing test reliability. Its operation is briefly illustrated by example. Sometimes a strong autocorrelation is observed from pitch data. We also discuss a process monitoring scheme taking account of autocorrelations.

An investigation on noise quality of the small gear reductioner through change of gear backlash (기어 백래쉬(Backlash) 변화에 의한 소형감속기의 소음특성에 관한 연구)

  • Kim, Joo-Han;Sung, Ha-Kyeong;Chung, Jung-Kee
    • Proceedings of the KSME Conference
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    • 2001.06b
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    • pp.635-640
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    • 2001
  • The small gear reductioner noise is caused by gear accuracy, assembling errors, and gear backlash. This main study is an investigation on noise quality of the small gear reductioner through the change of gear backlash. In this study included Gear design parameters related the small gear reductioner, the knowledge of rattle noise related gear backlash, and the experimentation results of the small reductioner noise through change of gear backlash. At last, this study propose the least method of the small gear reductioner noise that is caused by suitable existence of gear backlash.

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An investigation on noise quality of the gear head for ac induction motor (AC Induction motor용 강력형 Gear Head의 소음 특성 연구)

  • Kim, Joo-Han;Sung, Ha-Kyeong;Im, Tae-Bin;Chung, Jung-Kee
    • Proceedings of the KIEE Conference
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    • 2001.07d
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    • pp.2390-2392
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    • 2001
  • The small gear head noise is caused by gear accuracy, assembling errors, and gear backlash. This main study is an investigation on noise quality of the small gear head through the change of gear backlash. In this study included gear design parameters related the small gear head, the knowledge of rattle noise related gear backlash, and the experimentation results of the small head noise through change of gear backlash. At last, this study propose the least method of the small gear head noise that is caused by suitable existence of gear backlash.

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Sound Quality Analysis for Axle-Gear Whine Sound (액슬 와인 음질에 대한 연구)

  • Kim, Tae-Gyu;Lee, Sang-Kwon;Jo, Yun-Kyoung;Kim, Jong-Youn
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.05a
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    • pp.141-146
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    • 2007
  • A gear whine sound due to the axle system is one of the most important sound qualities in a sport utility vehicle (SUV). In the previous research about the gear whine sound, it was known that it is difficult to evaluate the gear whine sound objectively by using the only A-weighted sound pressure level because of the masking effect. In this paper, for the objective evaluation of the axle-gear whine sound, the characteristics of the axle-gear whine sound is at the first investigated based on the synthetic sound technology and the new objective evaluation method for the axle-gear whine sound is developed by using the sound metrics, which is the psychoacoustics parameters, and the artificial neural network (ANN) used for the modeling of the correlation between objective evaluation and subjective evaluation.

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A Study on the Effect of Macro-geometry and Gear Quality on Gear Transmission Error (기어 제원 및 기어 가공정밀도가 기어 전달오차에 미치는 영향에 대한 연구)

  • Lee, Ju-Yeon;Moon, Sang-Gon;Moon, Seok-Pyo;Kim, Su-Chul
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.20 no.11
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    • pp.36-42
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    • 2021
  • This study was conducted to analyze the effect of the gear specification and gear quality corresponding to the macro geometry on the gear transmission error. The two pairs of gears with large and small transmission errors were selected for calculation, and two pairs of gears were manufactured with different gear quality. The test gears were manufactured by two different gear specifications with ISO 5 and 8 gear quality, respectively. The transmission error measurement system consists of an input motor, reducer, encoders, gearbox, torque meter, and powder brake. To confirm the repeatability of the test results, repeatability was confirmed by performing three repetitions under all conditions, and the average value was used to compare the transmission error results. The transmission errors of the gears were analyzed and compared with the test results. When the gear quality was high, the transmission error was generally low depending on the load, and the load at which the decreasing transmission error phenomenon was completed was also lower. Even when the design transmission error according to the gear specification was different, the difference of the minimum transmission error was not large. The transmission error at the load larger than the minimum transmission error load increased to a slope similar to the slope of the analysis result.

Evaluation of Reliability of Large Hybrid Curvic Gear Using Thermography (서모그래피 기법을 적용한 하이브리드 대형 커빅기어 신뢰성 평가)

  • Lee, Gyung-Il;Kim, Jae-Yeol
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.16 no.3
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    • pp.146-152
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    • 2017
  • Stabilizing the operation of dual fuel diesel engines is very important. The shipbuilding industry is rapidly growing, but gear components requiring reliability are still imported from other countries. The reasoning for this is three-fold. Firstly, it is compulsory that all ships must use devices that meet the performance standards specified in the Safety of Life at Sea (SOLAS) and the convention of MARine POLlution (MAPOL) to prevent pollution caused by ships. Secondly, most ships must comply with the ship classifications specified by ship owners. Therefore, it is specified that key engine gear components must be inspected and authorized for the quality and performance specified by the Ship Register Authority. Thirdly, it is essential that devices (engine gear) for human safety in ships comply with quality standards specified in the regulations and rules by the government. The Ship Register Authority's strict quality standards and approval requirements contribute to the reduction of motivation towards new investment and technology development by device component manufacturers. Therefore, this study aims to develop a method for using infrared thermography to examine gear reliability in order to ensure gear component reliability and national competitiveness in the global market.

Study on Vibration Characteristic Improvement of Aircraft Landing Gear Handle (항공기용 착륙장치 핸들의 진동 특성 개선에 관한 연구)

  • Kang, Gu Heon;Ahn, Jong Moo
    • Journal of Aerospace System Engineering
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    • v.12 no.2
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    • pp.59-65
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    • 2018
  • The landing gear (L/G) handle of an aircraft is an essential piece of equipment for aircraft take-off and landing. The bracket in the landing gear handle was fractured during a vibration test when developing the landing gear handle. This paper summarizes the vibration test procedures performed during landing gear handle development. A cause analysis, design improvements, and verification results of the fault in the vibration test are also provided.

A Research for the Development of the Transmission Error Measuring System and Transmission Error Specification for the Gear Noise Quality (기어 소음 품질 안정화를 위한 전달오차 측정 시스템 개발 및 전달오차 스펙 개발에 대한 연구)

  • Lee, Sang Hwa;Lee, Hyun Ku;Kang, Seok Chan;Kim, Si Yoong;Yoo, Dong Kyu;Won, Kwang Min;Chae, Geum Muk;Lee, Tae Hwi
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.24 no.6
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    • pp.470-475
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    • 2014
  • In the past, transmission error(T.E.) has been identified as one of the main sources of gear whine noise, which cause serious passengers irritation at high frequency. In this study, to identify the correlation of the T.E. and gear whine noise, a T.E. measuring system was developed. By comparing the T.E. and gear whine noise level, T.E. target value which can represent the gear noise was proposed. The conclusions are followed: (I) It is possible to measure T.E. of the gear pairs (II) Similar trends are observed between T.E. and gear whine noise. (III) By observing the T.E. pattern, presence of sideband noise can be predicted. (IV) Proposed T.E. target value can be adopted to the gear manufacturing for gear noise quality management.

An Automated System for Inspecting Surface Finishes of Gear Teeth (기어날끝의 표면마무리에 대한 품질검사시스템)

  • Kim, Seong-Jun;Lim, Joon-Mook
    • IE interfaces
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    • v.9 no.2
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    • pp.105-117
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    • 1996
  • This paper presents an automated system for inspecting surface finish quality of gear teeth. The purpose of the presented system is to improve both efficiency and reliability of a gear inspection process with a lower cost. The system consists of two modules; one is for data collection and the other for data analysis. While and A/D converter is built in a PC to efficiently obtain digitized data, a window-based software for conducting quality tests is provided using VISUAL BASIC as well as C++. We successfully connect them with the existing gear tester. This system would be also useful for the gear quality improvement by means of a continuous data management.

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The Study And Application Of Planetary Gear Net Forging Technology

  • Zhu Weicheng;Song Baoyang;Xu Cenglin;Fu Chenglin;Li Xiaohui;Li Enlai;Yan Mingchen
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2003.10b
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    • pp.133-137
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    • 2003
  • In this paper presented the net forging technology of planetary gear after much experiment and analysis, technology of two forging processes after billet being one -time heated, and cold net forging was adopted to ensure the gear forming quality. In the process of die producing, electrical rod NC cutting technology was used .the test and application has proved the net forging gear has reached higher quality and met the requirement of design. The net forging gear technology had been put into production.

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