• 제목/요약/키워드: 변속성능

검색결과 99건 처리시간 0.023초

무단변속용 정유압기계식 변속기 탑재 구동계의 성능해석 (Performance Analysis of the Vehicle With Hydromechanical Transmission)

  • 송창섭;강서익
    • 한국정밀공학회지
    • /
    • 제12권7호
    • /
    • pp.131-137
    • /
    • 1995
  • The performance analysis is applied to the transmission of the tracked vehicle, comparing simulation results with vehicle test. The calculation method of hydrostatic pump/motor performance and power circulation is used for hydromechanical transmission simulation. And various shifting characteristics is analyzed by studying power flow at each range.

  • PDF

V-blet를 적용한 2단 수동변속기의 변속특성에 관한 연구 (Study on the Shift Characteristics of a 2speed Manual Transmission apply to V-Blet)

  • 염광욱
    • 한국가스학회지
    • /
    • 제24권6호
    • /
    • pp.55-60
    • /
    • 2020
  • 세계적으로 친환경자동차의 연구 및 개발이 확대되면서 주행거리를 증대시키기 위해 차량의 부가적인 장치를 축소·삭제하거나 경량화를 위한 연구를 진행하고 있다. 그 중 내연기관자동차에 적용되던 다단변속기를 삭제하고 감속기로 대체하여 모터출력 값 제어를 통해 토크증대로 초기구동력을 확보하고 있다. 하지만 잦은 모터의 속도변화로 부하가 상승되는 결과를 가져올 수 있기 때문에 본 연구에서는 일반적인 감속기구조를 갖는 소형·경량의 수동 2단 감속기를 개발하려고 한다. 따라서 평행축을 갖는 구조에 대기어와 소기어를 삽입하여 평행한 축의 감속기형태에서 V-벨트로 기어를 연결하고, 저단과 고단의 기어비를 각각 설정하여 2개의 기어비를 갖는 2단 변속기를 설계하였다. 또한 변속기의 회전속도와 부하에 따른 동력성능을 시험을 통해 확인하고 구동시 발생되는 발열특성을 확인하여 변속기의 타당성을 검증하였다.

건식 무단변속기 부품 성능에 관한 실험적 연구 (An Experimental Study on the Parts Performance of Dry CVT)

  • 권영웅
    • 동력기계공학회지
    • /
    • 제10권3호
    • /
    • pp.73-80
    • /
    • 2006
  • The main advantages of the Dry CVT with V-belt, which has been popular in Asia, are a simple mechanism, less maintenance and low cost. The important factors which have an influence on the performance of the CVT are the weight of the centrifugal roller, the change of axial distance and spring force. Based on an experiment, the effects of load torque, speed ratio, and revolution of both the driving pulley and the driven pulley during the alteration of the axial distance, roller weight and spring constant were studied.

  • PDF

건설차량용 반자동 변속기 유압제어계의 성능 개선 (Performance Improvement of Clutch Actuating Hydraulic Control System at Semi-Automatic Transmission for Construction Vehicles)

  • 이일영;윤소남;양경욱;이덕규
    • 한국자동차공학회논문집
    • /
    • 제4권3호
    • /
    • pp.10-21
    • /
    • 1996
  • In this study, as a strategy to improve shift characteristics, the authors developed a new style pressure modulator which can reduce shock torque during power shift by modulating the pattern of pressure increase in the cylinder for actuating the clutch. The remarkable merits of this new pressure modulator lie in its structural simplicity and durability, because the modulator is only composed of a poppet type valve and a few orifices. The usefulness of the new pressure modulator is confirmed by experiments and numerical analyses on a clutch control hydraulic system simplified for easy test. Also, the excellency of the transmission with the new pressure modulator is verified by experiments on a test bench for simulating the running power train of an excavator.

  • PDF

차동기어장치와 V-벨트식 변속기구를 결합한 무단변속기의 성능 (Performance of CVTs Composed of a Differential Gear Unit and a V-belt Drive)

  • 최상훈
    • 한국정밀공학회지
    • /
    • 제20권2호
    • /
    • pp.199-208
    • /
    • 2003
  • Continuously variable transmission (CVT) mechanisms considered here combine the functions of a K-H-V type differential gear unit and a V-belt type continuously variable unit (CVU). As combining the functions of a K-H-V type differential gear unit and a V-belt type CVU, 24 different mechanisms are presented. Some useful theoretical formula related to speed ratio, power flow and efficiency are derived and analyzed. These mechanisms have many advantages which are the decrease of CVT size, the increase of overall efficiency, the extension of speed ratio range, and the generation of geared neutral.

2-모드 기계유압식 무단변속기의 성능 및 전달효율해석 (Performance and Transmission Efficiency Analysis of 2-Mode Hydro Mechanical Transmission)

  • 정규홍;김형의;김종기
    • 한국자동차공학회논문집
    • /
    • 제13권1호
    • /
    • pp.90-98
    • /
    • 2005
  • HMT is a type of continuously variable transmission which has split power flow path characteristics with gear train and hydro static unit. The benefit of improved fuel economy and high power capacity enables it to be a promising application fur large vehicles. This paper presents the analysis results including velocity, static torque, transmission efficiency and dynamic model of the HMT that is developed for city buses. The speeds or gear shafts, the static clutch torque and split power ratio for each mode are detailed here. From the analysis of HMT transmission efficiency considering the power loss in meshed gear and hydraulic unit, we can conclude that minimization of hydraulic power is necessary for improved fuel economy design. Also, the dynamic simulation result for mode shift characteristics shows that little shift shock is observed because of the synchronized rotation speed in clutch.

고무 벨트식 무단변속기 시스템의 성능분석 (Performance Analysis of the Rubber Belt type CVT System)

  • 김성모;정춘화;임원식;차석원
    • 한국생산제조학회지
    • /
    • 제20권4호
    • /
    • pp.376-381
    • /
    • 2011
  • CVT(Continuously Variable Transmission) is one of the most promising candidates for the future automobile transmission because of its continuously variable gear ratio and reduced shift shock. It is also possible to operate the power source at its high efficiency region with CVT. The CVT system consists of thrust plate, driving pulley, belt, driven pulley, and preload spring of output shaft. In this paper, the dynamic modeling of a CVT system is completed to obtain the static performances of CVT system. A simulator is implemented on Matlab(Simulink), which can analyse the static performances of a CVT system. The methods for improving the total efficiency of a motorcycle system are also proposed based on the simulation results. In this study we increase the capacity factor of CVT up to the three times of default specification.

차량 운행에 따른 자동변속기유(ATF) 금속분 분석평가 연구 (A study on the evaluation of metal component in automatic transmission fluid by vehicle driving)

  • 이정민;임영관;도진우;정충섭;한관욱;나병기
    • 에너지공학
    • /
    • 제23권2호
    • /
    • pp.28-34
    • /
    • 2014
  • 자동변속기유는 자동차의 자동변속기의 성능을 유지시키기 위해 사용되는 유체이다. 최근 자동차 제조사에서는 일반적으로 자동변속기유를 80000~100000 km 주행후 교환 또는 무교환을 보증하고 있지만 국내에서는 많은 운전자들이 50000 km 이하에서도 자동변속기유를 교환하고 있는 것으로 조사되었다. 빈번한 자동변속기유의 교환은 환경오염과 차량유지비용을 상승시키는 원인으로 작용되고 있다. 본 연구에서는 사용하지 않은 신유와 50000 km와 100000 km를 각각 주행한 뒤 회수된 자동변속기유를 대상으로 인화점, 연소점, 유동점, 동점도, 저온겉보기점도, 전산가, 금속분과 같은 물리적 특성을 분석하였다. 연구결과, 신유에 비해 사용유는 전산가, 유동점, 금속분이 증가되는 것을 확인하였지만, 두 종류의 사용유(50000 km, 100000 km)의 물리적 특성과 금속분 함량의 차이는 크지 않음을 알수 있었다.