• 제목/요약/키워드: Main Clutch

검색결과 33건 처리시간 0.018초

클러치 비틀림특성에 의한 자동차 수동변속기 치타음에 관한 연구 (A Study on Rattle Noise of Automotive Manual Transmission by way of Torsinal Characteristics of a Clutch Disc)

  • 홍동표;정태진;태신호
    • 한국자동차공학회논문집
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    • 제3권3호
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    • pp.79-89
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    • 1995
  • Rattle noise occurs at manual transmission as idling and driving of a automotive. It can be solved by torsional characteristics of a clutch disc. A clutch disc consist of a region of pre-damper and main-damper. Rattle noise is affected by pre-damper and main-damper equipped for a torsional spring and friction washer. Pre-damper range covers noise radiating from manual transmission when engine is idling and main-damper range covers noise when engine is driving. The aim of this reserch is to clear transmission rattle noise by way of torsional characteristics of a clutch disc. The experiment is carried out as idling and driving of a automobile equipped for 1.5L MPI engine, dry single-disc type clutch and manual transmission. In this study, the results show for a vibration of manual transmission as idling and driving can be cleared by a clutch disc of Pre-damper type.

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자동차 공회전시 기어 치타음에 영향을 미치는 파라미터에 관한 연구 (A Study on the Parameters Influence upon Automotive Neutral Gear Rattle)

  • Hong, D.P.;Chung, T.J.;Ahn, B.M.;Jeon, B.H.
    • 한국정밀공학회지
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    • 제14권2호
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    • pp.74-83
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    • 1997
  • The non-periodic angular accelerations of engine are the major cause of gear rattle. This gear rattle is based on the existence of a backlash between the drive gear of input shaft and the free gear of output shaft in the gearbox. Especially, the neutral gear rattle have a very bad effect on the ride quality. Test-rig was constructed in order to evaluate the parameter influence upon the neutral gear rattle. Also, each different 4 type torsional characteristic of clutch was manufactured. Experimental conditions are the use of each different 4 type torsional characteristic of clutch and oil temperature variation in gearbox. In case of the same stiffiness of pre-damper type clutch at idling, the clutch of large hysteresis showed dam- ping effects at the 2nd input gear and the 2nd output gear. Also, the main-damper type clutch was shown to large resonance phenomenon at the 2nd input gear. Accordingly, main-damper type clutch was unapp- roriate at idling.

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유용방향법 최적화 알고리즘을 이용한 트랙터 클러치 최적설계 (Design Optimization of Tractor Clutch Mechanism Systems by Using Feasible Direction Method)

  • 조희근;김경원;이인복
    • Journal of Biosystems Engineering
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    • 제35권5호
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    • pp.287-293
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    • 2010
  • In order to optimize an agricultural tractor clutch mechanism system, its structural static and kinematic mechanism were analyzed. The operating force of the mechanical tractor clutch system is currently not appropriate to drive comfortably. So it is needed to reduce the clutch operating force by applying advanced engineering design techniques. In the present study, an optimization technology is applied to the design of tractor clutch systems to reduce the operating force. As a result of the optimization using 2 link-angles and 1 link-length which are the main design variables of the clutch linkage system, the maximum pushing force of the maximum clutch pedal was found 182.8N, 14% decreased compared to the existing clutch system. The effectiveness of the optimum design is certified by menas of an experiment.

휠 굴삭기용 변속기의 클러치 마찰특성 분석 (Analysis of the Friction Characteristics of Transmission Clutch of a Wheel Excavator)

  • 이용범;김광민
    • Tribology and Lubricants
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    • 제29권1호
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    • pp.1-6
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    • 2013
  • Hydraulic transmission is the main component delivering power to the drive wheels of an excavator during forward and backward movement, and it has low speed, high torque and high speed, low torque gear change ratios as a forward/backward two-speed main function. It also has additional function of ensuring that the excavator is stably fixed on the ground with the built-in parking brake during excavation operations. In this study, optimal design specifications are determined by modeling and simulating about the multi-disc-type friction clutch, which is the main component improving the reliability of the hydraulic transmission for a 14-ton wheel excavator, and the friction properties of the transmission clutch are analyzed by performing sample tests.

Study on performance test of orchard tractor power transmission systems

  • Sung, Nam-Seok;Chang, Dong-Il;Huh, Yun-Kun;Chung, Sun-Ok;Cho, Jong-Seung;Ha, Jong-Kyou
    • 농업과학연구
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    • 제40권3호
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    • pp.237-241
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    • 2013
  • This study started to export an orchard tractor to Europe under the situations that R&D activities for orchard tractor were marginal and even it was not produced. The R&D for orchard tractor has been progressed and the most of it is accomplishing the goal. In this study, the durability of clutch friction part was tested for F/R clutch and moment of inertia of PTO clutch, and it was compared with the design criteria of transmission of tractor. According to the results of inertia test of F/R clutch, hydraulic pressures of clutch satisfied $1,961.33{\pm}196.13kPa$ of design criteria, and the variations of torque for forward and reverse operation were relatively constant. Therefore, it was found that the durability of clutch friction part was stable and reliable. Test results showed that the main hydraulic pressures were maintained $1,961.33{\pm}196.13kPa$ during the tests of moment of inertia of PTO clutch, and when it was operated, the hydraulic pressures were reached $1,961.33{\pm}196.13kPa$. Therefore, it was found that the hydraulic pressures of PTO satisfied the design criteria. By the results that the time of the hydraulic pressures of PTO reaching main hydraulic pressure, and that of torque values restoring to the original was same as the time of the first gear of PTO reaching the maximum rotational speed, it was found that PTO could transfer power to attachments as it was designed.

클러치 댐퍼 설계 기법 연구 (A Study on the Clutch Damper Design Technique)

  • 안병민;장일도;최은오;홍동표;정태진
    • 소음진동
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    • 제7권6호
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    • pp.1031-1037
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    • 1997
  • The main torsional vibration source of the driveline is the fluctuation of the engine torque. The gear rattle is generated by an impact in the backlash due to this torsional vibration. Optimization of the clutch torsional characteristic is one of the effective methods to reduce the idle gear rattle. Many researches have been reported on this problem but only few of them give sufficient consideration to the detail clutch modeling and clutch design parameters (stiffness, hysteresis torque, preload, first stage length). This paper pays attention to the gear impact mechanism and clutch design parameters to reduce the idle gear rattle with computer simulation.

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농용 무인헬리콥터의 원심클러치 설계 - 동력 전달의 이론분석 - (Centrifugal Clutch Design for an Unmanned Helicopter - Theoretical Analysis of Power Transfer -)

  • 이재홍;구영모;신시균
    • Journal of Biosystems Engineering
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    • 제33권1호
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    • pp.14-20
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    • 2008
  • An agricultural unmanned helicopter was suggested for an alternative to current pesticide application methods to solve such problems as high cost, low efficiency, shirking task and unsafe work. To pursuit this trend, researches on the development of unmanned helicopters have been accelerated in Korea as well. In this research, a guide type centrifugal clutch that plays an important role in the unmanned helicopter was studied. Theoretical analyses and experimental tests were conducted for designing an optimal clutches. Main design factors of the guide type centrifugal clutch were found to be spring constant, free length of spring, mass of friction sector, contact area, allowable pressure, number of friction sector, friction coefficient, radius of drum, and clutch arrangement. And these design factors could be the functions of engaging engine speed and desired power transfer capacity. The result of the single clutch test showed the power transfer capacity of 14.1 PS at 5,800 rpm and the result of the dual clutch test showed that the capacity of 17.7 PS at 5,600 rpm. These experimental results agreed well the theoretical simulations.

TCU 제어로직 평가를 위한 AMT 모델 개발 (Development of Automated Mechanical Transmission Model to Evaluate TCU Control Logic)

  • 오주영;송창섭
    • 한국정밀공학회지
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    • 제27권3호
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    • pp.118-126
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    • 2010
  • The automated mechanical transmission(AMT) is composed of electronic control management(ECM) and automatic shift gear(ASG). The AMT has advantages which are high efficiency of manual transmissions(MT) and offer operation convenience similar to automatic transmissions(AT). However, it has defects that are the torque gap during gear shift transients and shift time is long. To reduce such defects, it is necessary practically to evaluate error and characteristics as developing simulation model before the control algorithm is applied. In this paper, models are composed of vehicle model and AMT shift control model. Particularly AMT shift control model consists of main clutch management model (MCM) and shift control management model(SCM). The developed models were verified by comparing the simulated and experimental results under the same operational conditions. It can also be used to evaluate shift algorithm.

습식클러치 패드의 Groove 패턴에 의한 변속기유의 동적 거동 (Analysis of Dynamic Behaviors of Transmission Fluid Film in Wet Clutch Pad according to Patterned Grooves)

  • 김해용;장시열;김우정;신순철
    • Tribology and Lubricants
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    • 제30권2호
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    • pp.92-98
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    • 2014
  • Transmission fluid film behaviors in the gap between the wet clutch pad and separator plate are analyzed using the CFD software ADINA. Three pattern groove designs are selected and are used to validate the fluid film behaviors based on the outlet flow in the gap when the wet clutch pad and separator plate are engaged. The main design goal for pattern grooves is faster engagement. In most cases, much of the outlet flow of transmission fluid in the gap occurs on the outer radius boundary due to the centrifugal force generated by the clutch pad circular motion. Groove patterns are created to ensure faster transmission fluid outlet flow in the direction of the inner radius boundary. Computational results of the selected groove patterns are compared.

래틀 진동을 위한 설계 기법 연구 (A Study on the Design Technique to Reduce the Rattle Vibration)

  • 안병민;장일도;홍동표;정태진
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1997년도 춘계학술대회 논문집
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    • pp.562-566
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    • 1997
  • The main torsional vibration source of the driveline is the fluctuation of the engine torque. The gear rattle is impacts generating in the backlash of the free gear due to this torsional vibration Optimization of the clutch torsional characteristic is one of the effective methods to reduce the idle gear rattle. Many researches have been reported on this problem but only few of them give sufficient consideration to the full clutch design parameters(stiffness, hysteresis torque, preload, first stage length) and drag torque This paper pays attention to the gear impact mechanism, clutch design parameters and drag torque to reduce the idle gear rattle with computer simulation.

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