• Title/Summary/Keyword: Gear

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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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Design and Analysis of Gear Train with Composition of Optimum Gear Ratio (최적 치차비 구현을 통한 치차열의 각도 위치 오차 설계 및 해석)

  • Yun, Jae-Yun
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.6
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    • pp.102-108
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    • 2001
  • This paper addresses an analytical approach to the mechanical error analysis of gear train and tolerance design and manufacture of gear train in restricted space considering motor driving torque, driving system inertia, motor acceleration, motor rotor inertia and friction torque. The gear train is designed to have optimum gear ratio in restricted space and each gear is manufactured to have the lowest weight and each gear tooth is heat-treated to have robustness. Based on the small difference between the mechanical error analysis and measurement, gear train design with optimum gear ratio and restricted space and robustness is proposed.

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A Study on the Efficiency Analysis of 2K-H Type Planetary Gear Train (2K-H형 유성기어장치의 효율해석에 관한 연구)

  • 김연수;최성욱;최상훈
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.3
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    • pp.200-207
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    • 2000
  • The analysis of interference and efficiency are important phases in the design of planetary gear train. Because most planetary gear trains contain internal gear called ring gear, interferences between ring gear and planet gear should be analyzed in the step of design and manufacturing. Addendum modification coefficient, pressure angle, speed ratio between ring gear and sun gear are governing factors for interferences. In this paper, the interferences of 2K-H I type planetary gear train based on various planetary gear trains are studied. As that results, the ranges of addendum modification coefficients which would not lead to interferences is analyzed. Based on these ranges, theoretical efficiencies are investigated as 6 configurations of 2K-H I type planetary gear train, which is based on basic efficiency, and optimal addendum modification coefficients which generate the maximum efficiency of planetary gear train are presented. To prove results of theoretical efficiency analysis, experimentations are performed.

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A Study on The Tooth Creating Algorithms of The Cycloid Curve Gear and The Third Polynomial Curve Gear (사이클로이드 곡선 및 3차 다항식 곡선기어의 치형 설계에 관한 연구)

  • 최종근;윤경태
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.11 no.3
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    • pp.80-85
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    • 2002
  • The free curve gear is a non-circular gear without any relating center, which can perform free curve motion for complicated mechanisms, and minimize the work area. In this study, an algorithms for tooth profile generation of free curve involute gear is developed. The algorithm uses the involute gear creating principle in which a gear can be generated by rolling with another standard involute one. Cycloid me and third polynomial curve gears were designed and verified by computer graphics. These gears are manufactured in the wire-cut EDM and examined in engagement with a standard spur gear. The results showed that the proposed algorithm is successful to design and to manufacture the free curve gear with concave and convex profiles.

Analytical Study on Improvement in Load Sharing for Planetary Gear Set using Floating Ring Gear

  • Chung, Woo-Jin;Choi, Kyujeong;Oh, Jooseon;Park, Young-Jun;Lee, Ki-Hun
    • Journal of Biosystems Engineering
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    • v.43 no.4
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    • pp.263-272
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    • 2018
  • Purpose: The load on the planet gear of a planetary gear set is uniformly distributed. However, manufacturing and assembly errors cause uneven load sharing in the planetary gear set. To solve this problem, most studies have suggested applying a floating sun gear to the planetary gear set. However, the effect of the floating ring gear and floating carrier has not been extensively studied. This study aimed to investigate the effect of the floating ring gear. Methods: Two models were developed; one was the fixed ring gear model, and the other was the floating ring gear model. In the fixed ring gear model, the clearance between the ring gear and the housing was $0{\mu}m$, and in the floating ring gear model, the clearance was from $10{\mu}m$ to $100{\mu}m$. The load sharing of the planetary gear set was evaluated by the load sharing factor. Results: Our study showed that with increase in clearance, the load sharing factor of the planetary gear set approached unity. In addition, when the clearance increased above a certain level by which a fully floating ring gear was achieved, the load sharing factor was not affected by the clearance. Conclusions: This indicates that the fully floating ring gear increased the power density of the planetary gearbox by uniformly dividing the load of the planetary gear set. For this reason, the size of the gearbox could be decreased by using a fully floating ring gear.

Design, manufacture and analysis of gear train with composition of optimum gear ratio (최적 기어비 구현을 통한 치차열의 설계, 제작 및 분석)

  • 정상목;윤재윤
    • Journal of the Korea Institute of Military Science and Technology
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    • v.2 no.1
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    • pp.132-138
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    • 1999
  • This paper addresses an analytical approach to the mechanical error analysis of gear train and tolerance design and manufacture of gear train in restricted space considering motor driving torque, driving system inertia, motor acceleration, motor rotor inertia and friction torque. The gear train is designed to have optimum gear ratio in restricted space and each gear is manufactured to have the lowest weight and each gear tooth is heat-treated to have robustness. Based on the small difference between the mechanical error analysis and measurement, gear train design with optimum gear ratio and restricted space and robustness is proposed

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A Study on Kinematic Characteristics of Planetary Gear Train (유성기어열의 기구학적 특성분석에 관한 연구)

  • 박세환;신중호;윤호업;김대원
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.10a
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    • pp.643-646
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    • 1997
  • Gear trains are used in many machinery for variable speed ratios. Typical shapes of gear trains are tivo categories : simple gear trains and planetary gear trains. This paper presents the kinematic ctraracteristics for planetary gear trains. The characteristics are the constraints of geometric relationships, number of gears, speed of each gear. and speed ratio of the train. The objective goal of this paper provides the CAI) software, which is the academic tool for understanding the kinematics of the planetary gear trains.

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A Study on Vibration Characteristics by Gear Transmission Error of Vehicle Transmission (자동차용 변속기의 치합전달오차에 의한 진동특성 연구)

  • 배명호;박노길
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.11 no.8
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    • pp.364-373
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    • 2001
  • The gear whine noise of vehicle transmission is directly correlated tilth the gear transmission error of mating gear The object of this study is to build up the synthesized countermeasure for the reduction of gear whine noire of vehicle transmission by developing the program which can be used to analyze and predict the vibrational characteristics caused by gear transmission error of mating gears of vehicle transmission. The developed mathematical models on the elements of transmission, for example, helical gear pairs, bearings and shafts are used and the modeling of the excitation forces are developed by the gear transmission error of mating gear which is defined by the amount of the elastic deformation of gear tooth & shaft and gear profile & lead errors. The mathematical system model of vehicle transmission developed by the substructure synthesis method Is also verified by the experiments.

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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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A PHOTOELASTIC ANALYSIS OF THE EFFECT OF ORTHOPEDIC FORCES ON THE CRANIOFACIAL COMPLEX UTILIZING THE THREE KINDS OF THE HEAD GEAR (각종의 HEAD GEAR를 사용한 정형력이 두개안면 골에 미치는 영향에 대한 광탄성적 연구)

  • Kim, Kwang-Ho
    • The korean journal of orthodontics
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    • v.16 no.1
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    • pp.71-84
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    • 1986
  • The purpose of this study was to analyze the effect of orthopedic forces on the craniofacial complex utilizing the three kinds of the head gear. (high pull head gear, straight pull head gear, cervical pull head gear) For this study, the teeth and alveolar bone and palate were reproduced from birefringent materials and other parts of craniofacial complex were coated with birefringent material on the model. The effect of orthopedic forces on the craniofacial complex was analyzed by photoelastic method using transmission polariscope and reflection polariscope. The results were as follows. 1. The cervical pull head gear had the greatest tipping effect on the maxillary molars and high pull head gear had the least tipping effect. 2. In areas stressed, the cervical pull head gear stressed the greatest degree. 3. Only cervical pull head gear produced stress at the zygomaticofrontal suture and the posterior region of palate. 4. The straight pull head gear and high pull head gear produced stress at just inferior to the anterior nasal spine. 5. The cervical pull head gear and straight pull head gear produced tensile stress at the fronto-maxillary suture. 6. The pterygoid plates of the sphenoid bone, the zygomatic arches, the junction of the maxilla with the lacrimal and ethmoid bone, and the maxillary molars were affected by three types of head gear.

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