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자동변속기용 단독 구동 동축 2단 전동식 오일펌프 특성 분석
이준용(Junyong Lee),허형석(Hyungseok Heo),이헌균(Heonkyun Lee),이병석(Byeongseok Lee),이호식(Hosic Yi),심정민(Jeongmin Shim) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Automatic oil pump pressurizes oil for transmission components to operate under high pressure and circulates oil to the lubricating part under low pressure. The oil pump elevates oil pressure to high level to be possible to transfer torque. Pressure control valves in the valve body reduces the pressure of some of the pressurized oil to low level. That is, over-design of the oil pump is a major cause of power loss and it is possible to reduce power loss by separating oil pump into the high pressure pump and low pressure pump. This paper introduces the 2-stage oil pump which has two oil pump in one housing and is driven by the same shaft, the low pressure pump supplies lubricating oil and the high pressure pump generates transmission oil pressure. In this paper the performance of th 2-stage oil pump for automatic transmission system is analyzed by computational fluid dynamic method.
단흡입 양토출 2단 오일펌프의 유량 분배 특성에 관한 해석적 연구
이준용(Junyong Lee),허형석(Hyungseok Heo),이헌균(Heonkyun Lee),이병석(Byeongseok Lee),심정민(Jeongmin Sim),전문수(Munsoo Chon) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
Recently, To improve fuel efficiency and power consumption reduction technology in automobile parts is the issue. Automatic transmission oil pump for electric vehicles(EV) generates high pressure(HP) for shifting and low pressure(LP) for lubrication. There is the problem that unnecessary power loss by reducing automatic transmission fluid(ATF) pressure HP to LP. Power loss of the oil pump is a cause of deteriorating the fuel consumption of automobiles. In the case of EV, it is necessary to large capacity of the electric motor. and it grows the power consumption of the pump. Double discharge single suction 2-stage oil pump configures the HP pump and LP pump part to the single axis. It is possible to pressing the pressure required and reduce unnecessary power loss. In this study, HP, LP line pressure rotational speed of the rotor, ATF oil temperature of 2-stage oil pump has confirmed the effects on flow rate by using the CFD analysis. The pump characteristic according to the change in the rotational speed of the rotor was compared by experimental researching.
정동원(Dongwon Jung),이병석(Byeongseok Lee),손진욱(Jinwook Son),우수형(Soohyung Woo),김영남(Youngnam Kim),오희창(Heechang Oh),한동희(Donghee Han) 한국연소학회 2019 KOSCOSYMPOSIUM논문집 Vol.2019 No.5
This study demonstrates on the technologies for the development of gasoline engine to improve brake thermal efficiency. All experiments have been conducted for stoichiometric operation at 2000RPM. The test engine is a four-cylinder 2.2L GDI engine, which has a long-stroke concept (102mm stroke and 79mm bore). The effects of compression ratio, EGR rate, the number of spark plugs, tumble ratio and super charger were explored. As a result, the maximum brake thermal efficiency can be achieved up to 44.6%.
가변 제어를 위한 병렬 배치식 엔진 오일펌프의 유동 특성 해석 평가
황재순(Jaesoon Hwang),허형석(Hyungseok Heo),이헌균(Heonkyun Lee),배석정(Sukjung Bae),정영대(Youngdae Choung),이병석(Byeongseok Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Conventional mechanical engine oil pump is driven by engine power via belt mechanism, whose discharge oil flow increases linearly with rotating speed. This causes engine power loss because the mechanical oil pump supplies more excessive oil flow than required on the various engine speeds and temperature conditions. Automotive manufacturing companies are developing electric oil pumps to control the oil flow rate variably in the engine operation regions. However, on the low temperature conditions engine oil gets more viscous and requires more driving torque, moreover, the motor to drive the electric oil pump is required to have larger capacity and size. The solution to make up these defect is technique of parallel engine oil pumps consists of an electric pump and a reduced mechanical pump. This study aimed to introduce the technology of parallel engine oil pumps and to analysis hydraulic performance of parallel engine oil pumps on the various operating conditions by computational fluid dynamics.
가변 제어를 위한 병렬 배치식 오일펌프의 엔진 모터링 성능 평가
황재순(Jaesoon Hwang),허형석(Hyungseok Heo),이헌균(Heonkyun Lee),이동혁(Donghyeok Lee),배석정(Sukjung Bae),정영대(Youngdae Choung),이병석(Byeongseok Lee) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Conventional mechanical engine oil pump is driven by engine power via belt mechanism, whose discharge oil flow increases linearly with engine rotating speed. This causes engine power loss because the mechanical oil pump supplies more excessive oil flow than required on the various engine speeds and temperature conditions. Automotive manufacturing companies are developing electric oil pumps to control the oil flow rate variably in the engine operation regions. However, on the low temperature conditions engine oil gets more viscous and requires more driving torque, so, the motor to drive the electric oil pump is required to have larger capacity and size. The solution to make up these defect is technique of parallel engine oil pumps consists of an electric pump and a downsized mechanical pump. This study aimed to analysis hydraulic performance of parallel engine oil pumps on the various operating conditions by engine motoring test.