• 제목/요약/키워드: gear train

검색결과 181건 처리시간 0.041초

한국형 고속전철용 감속구동장치 시운전 시험 및 평가 (Measuring and evaluation of reduction gear unit for running test of Korea High Speed Train)

  • 이동형;서정원;문경호;최경진;최강윤
    • 한국철도학회:학술대회논문집
    • /
    • 한국철도학회 2003년도 춘계학술대회 논문집
    • /
    • pp.554-560
    • /
    • 2003
  • The transmission systems of high speed train serve in the severe condition compared with those of other trains, namely, they have to transmit high power to run with high speed and they have to make maximum use of the limited space. To clarify the capability of reduction gear unit for Korea High Speed Train, torque and temperature, vibration on the reduction gear unit were measured and test data were analyzed. This paper reports test methods and test results that performed to verify reliability of reduction gear unit during running test of Korea High Speed Train. It is confirmed from these results that the performance of reduction gear unit has not any problem.

  • PDF

스타형 유성기어열의 전달오차에 관한 연구 (A Study on the Transmission Error of a Star type Epicyclic Gear Train)

  • 류형태;이동환;천길정
    • 한국자동차공학회논문집
    • /
    • 제7권5호
    • /
    • pp.206-212
    • /
    • 1999
  • In this paper, the transmission error of a atar type Epicyclic Gear Train (EGT) has been studied. Dynamic analysis has been executes calculate the rotation angle of the input and output shafts at various loads. Transmission Error of EGT has been measured to compare with the analysis results. There are qualitative similarity between the experimental and analytical results.

  • PDF

1단 유성기어의 전달오차 특성에 대한 실험적 연구 - 토크 및 속도 변화의 영향 (Experimental Study on Transmission Errors of a Single-Stage Planetary Gear Train: Influence of Torque and Speed Variations)

  • 송진섭;이근호;박영준;남용윤
    • 한국생산제조학회지
    • /
    • 제24권3호
    • /
    • pp.320-326
    • /
    • 2015
  • Despite the wide industrial applications of planetary gear trains, the relationship between the design parameters (tooth profile, carrier mass, etc.) and performance (strength, vibration, noise, etc.) remains poorly understood. A significant amount of research has focused on transmission errors, which are measurable performance indicators directly related to the design parameters. Herein, an experimental test rig for a single-stage planetary gear set built using digital angular encoders and gap sensors is described. To study the static and dynamic characteristics of this planetary gear train, the transmission errors and sun gear orbit are analyzed from the data measured under various levels of torque and speed. The transmission errors of the gear train decrease 40% when the speed increases from 30 to 600 rpm with an output torque of 39.2 Nm, and increase 22% when the output torque increases from 19.6 to 39.2 Nm with an input speed of 30 rpm.

소음/진동을 고려한 발전설비용 감속기 개발 (Development of Reducer for Generating Facility of Electric Power for Low Noise/vibration)

  • 이형우;박철우
    • 한국정밀공학회지
    • /
    • 제25권11호
    • /
    • pp.73-82
    • /
    • 2008
  • A dynamic model of reducer for generating facility of electric pourer having bevel gear pair and planetary gear train is developed by lumped method. The model accounts for the shaft and bearing flexibilities, gyroscopic effects and the force couplings among the transverse and torsion motions due to gearing. Vibration/noise analysis as well as strength of bevel gear pair and planetary gear train are considered. Exciting forces of high reducer for generating facility of electric power areconsidered as the mass unbalance of the rotors, misalignment and a function of gear transmission error. A Campbell diagram, in which the excitation sources caused by the mass unbalance of the rotors, misalignment and the transmitted errors of the gearing are considered, shows that, at the operating speed, there are not critical speed.

트랙터 8단 자동변속기 기어 열 설계 (Gear Train Design of 8-Speed Automatic Transmission for Tractor)

  • 정규홍
    • 드라이브 ㆍ 컨트롤
    • /
    • 제10권2호
    • /
    • pp.30-36
    • /
    • 2013
  • Tractor is a farm vehicle that is designed to provide a high tractive effort at low speed. It is used for versatile agricultural tasks such as hauling a trailer, tillage, mowing and construction work. Most older tractors use a manual transmission. However, as the intensity of work increases, tractors equipped with automatic transmission become popular due to the work convenience. In order to give the operator a large degree of control in field work, 24 gears with automatic 8-speed and manual 3-speed are arranged in transmission. This paper deals with the gear train that is designed for 8-speed automatic transmission by the engagement of multi-disk clutches. The gear ratio for each speed as well as power transmission mechanism is analyzed through velocity analysis. In addition, constraints of mesh gear ratio are derived by investigating the power flow path in velocity diagram for the given 8-speed gear ratio.

경운기의 고속 로터리 경운시스템 개발에 관한 연구 (Study on the Development of High-speed Rotary Tilling System for Power Tiller)

  • 이승규;김성태;우종구;김재영
    • Journal of Biosystems Engineering
    • /
    • 제26권5호
    • /
    • pp.423-430
    • /
    • 2001
  • The purpose of this study is to develop high-speed rotary tillage system for a power tiller by improving the rotary blade and the power train of transmission. Mechanical structure of gear train of rotary drive of conventional power tiller was simplified so that power can be transmitted directly from second shaft to tilling speed change shaft by rotating freely the transfer gear which changes the direction of rotation of shafts using needle bearing installed into middle shaft. A new gear train suitable for the single-edged rotary blade and high-speed rotary drive was developed with the rotational speed of rotary shaft faster than 7.5% at 1st-speed and 1.4% at 2nd-speed the one of conventional system by changing the numbers of teeth of gears of middle shaft, tilling speed change shaft and PTO shaft. Using the developed gear train for high-speed rotary drive, field tests were performed to compare tillage performances by the developed single-edged blade and by the conventional double-edged blade. The results showed that the performances by the single-edged blade compared with the one by the double-edged blade was improved about 18% in field capacity, about 34% in fuel consumption, and 9.4% in soil crushing ratio. Therefore, it may be concluded that tillage performance by the single-edged blade was improved compared to the one by the conventional blade. Evaluation of the developed system consisting of single-edged blade and gear train for high-speed rotary drive in field revealed that tillage performance of the developed system was similar to the one of field test conducted using the system consisting of single-edged blade and gear train for rotary drive of conventional power tiller However, considering the higher cone index of the upland field where evaluation was carried out compare to the one of the ordinary paddy field, it may be concluded that tillage performance of the developed rotary tilling system better than the one of conventional system.

  • PDF

풍력발전용 피치 드라이브 시스템의 복합 유성기어류에 대한 피로 강도해석 (Fatigue Strength Analysis of Complex Planetary Gear Train of the Pitch Drive System for Wind Turbines)

  • 김광민;배명호;조연상
    • Tribology and Lubricants
    • /
    • 제37권2호
    • /
    • pp.48-53
    • /
    • 2021
  • Wind energy is considered as the most competitive energy source in terms of power generation cost and efficiency. The power train of the pitch drive for a wind turbine uses a 3-stage complex planetary gear system in being developed locally. A gear train of the pitch drive consists of an electric or hydraulic motor and a planetary decelerator, which optimizes the pitch angle of the blade for wind generators in response to the change in wind speed. However, it is prone to many problems, such as excessive repair costs in case of failure. Complex planetary gears are very important parts of a pitch drive system because of strength problem. When gears are designed for the power train of a pitch drive, it is necessary to analyze the fatigue strength of gears. While calculating the specifications of the complex planetary gears along with the bending and compressive stresses of the gears, it is necessary to analyze the fatigue strength of gears to obtain an optimal design of the complex planetary gears in terms of cost and reliability. In this study, the specifications of planetary gears are calculated using a self-developed gear design program. The actual gear bending and compressive stresses of the planetary gear system were analyzed using the Lewes and Hertz equation. Additionally, the calculated specifications of the complex planetary gears were verified by evaluating the results from the Stress - No. of cycles curves of gears.

한국형 고속전철용 기어의 시편 및 실물 피로강도 평가 (Bending fatigue strength comparison of specimen and actual gear for Korea High-Speed Train)

  • 이동형;서정원;문경호;최경진
    • 한국철도학회:학술대회논문집
    • /
    • 한국철도학회 2002년도 춘계학술대회 논문집
    • /
    • pp.399-403
    • /
    • 2002
  • The transmission system of high speed train serve in the severe condition compared with those of other trains, namely, they have to transmit high power to run with high speed and they have to make maximum use of the limited space. To clarify the strength of gear for Korea High-Speed Train, a bending fatigue test of gear specimen is performed and compare with actual gear's. From this result, specimen test is useful to infer S-N curve and endurance limit of actual gear that much time and expense are consumed.

  • PDF

NC 선반 기어박스의 소음.진동 저감에 관한 연구 (A Study on Noise and Vibration Reduction of an NC Lathe Gear Box)

  • 최영휴;박선균;배병태;정택수;김청수
    • 한국소음진동공학회:학술대회논문집
    • /
    • 한국소음진동공학회 2000년도 추계학술대회논문집
    • /
    • pp.94-99
    • /
    • 2000
  • When operating NC lathe, gear box which is equipped with gear train and spindle sometimes generates loud noise and excessive vibrations. In order to identify their causes, In this study, torsional and lateral vibration characteristics including critical speeds of the gear train-spindle system are first analyzed by using torsional and lateral vibration models of the gear train and shafts. Natural frequencies and modes of the gear box structure are also analyzed by impulse hammer test. Furthermore, measured vibration and noise signals are analyzed and compared with theoretical analysis results. At last it is concluded that the cause of the excessive mise and vibration is the resonance between gear meshing frequency including its side bands, shaft bending and torsional vibration frequencies, and the natural frequencies of th gear box structure. Consequently the noise and vibration levels are greatly reduced by avoiding resonance between them through the redesign of the gear module.

  • PDF

경량전철용 차동기어장치의 구성 및 간섭에 관한 연구 (The Study on Configurations and Interferences of differential gear unit for Light Rail Transit)

  • 김연수;박성혁;이우동;정종덕;한석윤
    • 한국철도학회:학술대회논문집
    • /
    • 한국철도학회 1999년도 추계학술대회 논문집
    • /
    • pp.99-106
    • /
    • 1999
  • Because many light rail transit systems are mainly operated in the downtown areas of a large cities and the congestion areas, there are many steep gradients and sharp radius sections in that lines. As that reasons above, light rail vehicles are equipped with differential gear units between traction motors and final reduction gear units. In this paper, the configurations and the interferences of 2K-H I type Planetary gear train, which is applicable for light rail vehicles and based on various differential gear units, are studied. The ranges of addendum modification coefficients which would not lead to interferences is analyzed, and optimal addendum modification coefficients among these ranges are presented, which generate the maximum efficiency of planetary gear drives and differential gear unit as pressure angles, speed ratios,

  • PDF