• 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.

• Journal of Advanced Marine Engineering and Technology
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• 제41권4호
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• pp.330-336
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• 2017

본 연구는 고무 탄성커플링을 적용한 특수선의 디젤엔진 추진체계에서 유압작동식 다판, 습식 마찰클러치의 고착에 대한 원인분석 내용이다. 클러치 고착원인 분석을 위해 피쉬본((fish bone) 방법으로 클러치 및 감속기어 분해조사, 선박 탑재상태에서의 체계 시험 및 부품 조사, 비파괴 시험 등을 통해 수행하였다. 마찰판 고착은 클러치 중공축의 크랙부를 통해 제어오일 누설로 인한 슬립, 마찰열 발생에 의해 발생되었다. 마찰판 냉각 오일 또한 크랙부를 통해 동시에 누설에 기인한 유량부족으로 클러치 마찰판은 국부적인 눌러붙임이 발생하는 핫스팟(hot spot)에 의해 고착되었다.

• 한국자동차공학회논문집
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• 제5권5호
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• pp.9-19
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• 1997

In this paper, the modeling and analysis of dynamic characteristics has been carried out for friction clutches and brakes in an automatic transmission. From the operating oil pressure generated by the valve-body, time delay by check valve and the movement of piston has been examined. Also torque capacity and torque transferred at the clutch is studied. Heat capacity and temperature distribution at the reaction plate of clutch are codeled by time-dependent, nonhomogeneous partial differential equation, and brake torque, brake time, and the amount of heat generated are investigated. It is found that the time delay at the check valve is very short but dominant at the spool.