• 제목/요약/키워드: gear train

검색결과 181건 처리시간 0.034초

기어의 공차에 따른 스퍼 기어열의 전달 오차 해석 (Transmission Error Analyis of Spur Gear Trains with Tolerances)

  • 한형석;김태영;박태원
    • 한국정밀공학회지
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    • 제14권1호
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    • pp.90-100
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    • 1997
  • Sppur gear trains are used widely in high precision machines because gear trains have an advantage of exact transmission of angular velocity. Especially, gear trains are used in high quali8ty photocopying and photography OA machines. In general, gears have errors in manufacturing and assembling process and the errors are limited by tolerances. As the result, the tolerances cause the performance error. Therfore, it is important to predict transmission error caused by the tolerances for the tolerance design. Earlier tolerance design methods use mainly experimental and geometrical techniques. In this paper, a method for gear train analysis with tolerance is proposed. Because the method uses dynamic contacts, it is possible to consider irregularities and assemble errors of gears. In addition, the method can predit dynamic loads on the teeth of gears.

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풍력발전기용 기어트레인의 특성에 관한 연구 (An Investigation on the Characteristics of Gear Trains of Wind turbines)

  • 박노길;이형우
    • Journal of Advanced Marine Engineering and Technology
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    • 제34권6호
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    • pp.806-815
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    • 2010
  • 풍력발전기용 증속기는 유성기어시스템과 헬리컬기어(또는 스퍼기어) 쌍으로 구성된다. 본 연구에서는 AGMA2001 및 ISO281기준으로 설계된 기존 및 제안된 기어열로 구성된 기어트레인들에 대하여 동력전달 특성들을 비교 분석하였다. 기어트레인의 레이아웃 설계는 기어트레인의 총중량, 출력밀도, 99% 수명시간, 최대 기어 굽힘/면압응력이 산출되었다. 설계에 사용된 설계요구조건들은 블레이드 접선속도 40 ~ 100 m/s, 1000 ~ 1800 rpm 의 발전기 입력속도, 그리고 1 ~ 8 MW의 동력 범위이다. 따라서 본 연구에서 도출된 기어열의 특성들은 기어트레인의 고 신뢰성/초 경량화 설계에 기초자료로 활용될 수 있다.

정유압-기계식 변속기의 성능 특성과 형식 선정을 위한 설계 변수 (Performance Characteristics of Hydro-mechanical Transmission and Design Parameters for Type Selection)

  • 심동국;김경욱;한중수
    • Journal of Biosystems Engineering
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    • 제36권6호
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    • pp.422-433
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    • 2011
  • Market demand for hydro-mechanical transmission (HMT) for agricultural tractors has increased recently. To select a type of HMT satisfying design conditions, performance characteristics of 12 HMT types must be understood. This study was conducted to provide tractor engineers with a guideline to select the most appropriate HMT type for their design requirements. Characteristics on speed reduction ratio, power transmission efficiency, power regeneration, lock-up angular velocity, output torque ratio and torque ratio of planetary gear train axis of the 12 HMT types were investigated and presented as either formula or graphical forms. A guideline to select proper HMT type was also presented using 2 parameter: lock-up angular velocity (${\omega}_L$) and torque ratio of the planetary gear train axis. In addition, effect of gear ratio of the planetary gear train on the power transmission efficiency was investigated and a guideline to select the best gear ratio was also presented.

회전익기용 엔진 감속 기어열의 웹 형상 최적화 (Optimization of Gear Webs for Rotorcraft Engine Reduction Gear Train)

  • 김재승;김수철;손종현;문상곤;이근호
    • 한국항공우주학회지
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    • 제48권12호
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    • pp.953-960
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    • 2020
  • 본 논문은 회전익기용 엔진 감속기 주 기어열의 기어 웹 형상 최적화에 대해 기술하였다. 최적화 목표는 총중량, 전달 오차, 정렬 오차, 치면 하중 분포 계수 값의 최소화로 설정하였으며, 기어의 웹 두께, 웹과 축의 연결 위치, 웹과 림의 연결 위치를 설계변수로 선정하였다. 최적화 과정에서 기어의 웹, 축, 림은 3D 캐드 모델로부터 유한요소 모델로 변환되었으며, 기어 해석 프로그램 MASTA에 입력되었다. 최적화 알고리즘은 NSGA-II를 사용하였다. 최적화 결과 주 기어열의 총중량, 전달 오차, 정렬 오차, 치면 하중 분포 계수 값은 모두 감소하였으며, 최대 응력도 안전한 수준으로 나타나서 전반적으로 기어 성능이 개선되었음을 확인하였다.

고속열차 감속기의 상시감시시스템 설계 및 가변속주행시 안정성 향상을 위한 동특성해석 (Dynamic Characteristics Analysis for the Online Monitoring System Designing KTX MRU and Improvement of the Stability Related Variable High Speed)

  • 박병수;김진우;최상락;송영천
    • 한국소음진동공학회논문집
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    • 제23권4호
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    • pp.301-307
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    • 2013
  • MRU(motor reduction unit) for KTX is a assembled complex structure that is equipped with a lot of parts at the express train KTX and that is the core power source operating variable speeds. This study is recorded the dynamic characteristics analysis results tested by EMA which is done through the parts and assembly test, transient analysis and stoped train test in order to design the online monitoring system for KTX MRU. And the mode shapes result from critical vibration frequency explain the relation with variable speeds of express train over 250 km/hr. Also these variable speeds make variable operational frequencies at pinion, axle gear mesh frequency and normal bearing fault frequencies. As the specified speed can make resonance with natural frequencies of the MRU, for the train operating stability, this study also presents the MRU's critical speeds calculated by the each train speed.

6 속 자동변속기용 레펠레티아 유성 치차의 동력 해석에 관한 연구 (A Study on Power-Flow Analysis of The Lepelletier 6-Speed Automatic Transmission)

  • 박진홍;심재경;강봉수
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2004년도 추계학술대회 논문집
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    • pp.652-655
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    • 2004
  • In gear-train design, power-flow analysis is a very important process. The method for power-flow analysis apply the power balance equation and torque balance equation to each fundamental circuit. Then, the equation are solved simultaneously to determine the power-flow in planetary gear train. In this paper we perform power-flow analysis of a 6-speed automatic transmission. With this results are used to represent block diagram. In addition, the efficiencies of epicyclic inversion of the 6-speed automatic transmission is obtained.

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바닥고정형 유성기어박스의 진동특성에 관한 연구 (A Study on the Vibrational Characteristics of a Foot Mount Type Gearbox for Epicyclic Gear Train)

  • 이동환;윤인성;천길정
    • 대한기계학회논문집A
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    • 제24권10호
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    • pp.2619-2627
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    • 2000
  • In this paper, the vibrational characteristics of a foot mount type gearbox for epicyclic gear train have been studied. The modal parameters and mode shapes of a gearbox have been computed using AN SYS code. Modal testing was carried out to verify the FEM analysis model. It has been shown that the analysis results are in good agreements with the experimental results. Harmonic analysis has been executed to verify the effect of thickness variance of gearbox housing on the modal response. Analyzing the calculated results, some guides for optimal vibration response has been deduced.

차량 급가속시 운전성 개선을 위한 실험적 연구 (An Experimental Study of the Improvement of Driveability in Vehicle Acceleration Mode)

  • 송해박;최윤준;이종화;조한승;조남효
    • 한국자동차공학회논문집
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    • 제9권6호
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    • pp.65-75
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    • 2001
  • Modern vehicles require a high degree of refinement including good driveability. Vehicle driveability, which becomes a key decisive factor f3r marketability, is affected by many parameters such as engine control and the dynamic characteristics in drive lines. Therefore engine and drive train characteristics should be considered to achieve a well balanced vehicle response simultaneously. This paper describes experimental procedures which have been developed to measure engine torque and investigate shuffle characteristics. To analyze the vehicle dynamic behavior, fractional torques and inertia mass moment of engine, and drive train were measured. Shuffle characteristics during tip-in condition were investigated in an experimental vehicle at 2nd and 3rd gear stages. It was found that the shuffle characteristics were caused by sudden changes of engine torque and have a different vibration frequency with gear stage variation. Inertia mass moment of engine including flywheel rotation showed a key factor for the shuffle characteristics.

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