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자동차용 유압 베인 펌프의 기동 시 베인과 캠링의 이간
정재연(JaeYoun Jung),조인성(IhnSung Cho),백일현(IlHyun Beak),조재천(JaeCheon Jo),송규근(KyuKeun Song),오석형(SeokHyung Oh) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.11
In an oil hydraulic vane pump for automobile, it is very important that the vane doesn't have to be separated from the camring inner race in operation of the vane pump. Generally, the vane has not only the oil hydraulic force acting on the bottom face to contact camring inner race but also inertial force and viscous force. Because the oil hydraulic force is much larger than the other forces, the contact state between the vane tip and the camring inner race is good. However, in the starting of the vane pump, because the oil hydraulic force acting on the vane is zero, the contact state between the vane tip and the camring inner race is affected with only the other forces. If the viscous force larger than the inertial force, because the vane is separated from the camring inner race, the suction and delivery of the vane pump can be unstable or impossible. Therefore, in this paper, the state of the contact between the vane and the camring is considered. The results show that the rotating speed of the shaft, the operating temperature of the oil, the clearance between the vane and the rotor and the mass of the vane exert a great influence on the state of the contact between the vane and the camring.
차량용 사축식 피스톤 펌프의 피스톤 링과 실린더 보어간의 윤활특성에 관한 연구
정재연(JaeYoun Jung),조인성(IhnSung Cho),송규근(KyuKeun Song),백일현(IIHyun Baek),오석형(SeokHyung Oh),정석훈(SeokHoon Jung),정용욱(YongWook Jeong) 한국트라이볼로지학회 2007 한국윤활학회지(윤활학회지) Vol.23 No.5
The bent-axis type piston pump which is driven by the piston rod works on the way that the piston rod drives the cylinder block, so the taper angle of the piston rod and the swivel angle between the cylinder block and the shaft are very important design factors. If the above factors cannot satisfy the conditions of optimum design, the friction loss between the cylinder bore and the piston increases, and the pump can even fail to work under conditions of severe friction and wear. Since the piston reciprocates in the cylinder bore with high velocity, and at the same time it rotates on its own axis and revolves on the center of the cylinder block, the decrease of the volume efficiency generated on account of the leakage between the cylinder bore and the piston. Therefore, to prevent this case, the piston ring is designed at the end of the piston, and the friction characteristics between the piston ring and the cylinder bore are in need of research due to its great influence on the performance of piston pump. Thus, in this paper, the elastic hydraulic oil's lubrication analyses of the film thickness, the pressure distribution, and the friction force, and so on, have been performed, and the lubrication characteristics between the piston ring and the cylinder bore are explored by the results of the numerical analysis, and it is contributed to realize the higher efficiency and the more advanced performance of the bent-axis type piston pump.
사축식 유압 피스톤 펌프의 실린더블록 편심률에 따른 지연각의 특성 해석
정재연(Jaeyoun Jung),신현일(Hyunil Shin),백일현(Ilhyun Beak),조인성(Ihnsung Cho),송규근(Kyukeun Song),오석형(Seokhyung Oh),정용욱(YongWook Jeong) 한국트라이볼로지학회 2007 한국트라이볼로지학회 학술대회 Vol.2007 No.11
To improve the performance of the bent-axis type axial piston pump driven by the tapered piston, it is necessary to know the driving characteristics and mechanism of the tapered piston and the cylinder block. Since each piston not only rotates on its axis and reciprocates in the cylinder bore, but also revolves around the axis of the driving shaft, it is difficult to analyze the driving mechanism theoretically. The theoretical mechanism for the bent-axis type axial piston pump is studied by using the geometrical method. The driving range of the tapered piston is determined by theoretical equations. The results show that the cylinder block is driven by one tapered piston in a limited range and the core parameters such as driving factor of the piston and the ahead delay angle influenced performance of the bent-axis type axial piston pump
정재연(Jaeyoun Jung),신현일(Hyuni1 Shin),백일현(Ilhyun Beak),조인성(Ihnsung Cho),송규근(Kyukeun Song),오석형(Seokhyung Oh),정용욱(YongWook Jung) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.6
Recently, noise and vibration by roller bearing brings trouble to pass in need to more speedy rotating and light weight, high durability in rotating system. For distinction clearly of appropriateness of roller bearing element, the effect of total system necessaries sure understanding under the motion condition. But, although roller bearing is used extensively, the related researches in this field are extremely limited. Therefore, attempts have been made to calculate film thickness, pressure distribution throughout the analysis of elastohydrodynamic lubrication, and contribute to high efficiency and performance improvement of bent-axis type piston pump throughout the close examination of lubrication characteristics between roller and inner race of roller bearing in this paper.
사축식 피스톤 펌프의 피스톤 링과 실린더 블록 사이의 윤활 해석
정재연(JaeYoun Jung),조인성(IhnSung Cho),백일현(IlHyun Beak),신현일(HyunIl Shin),송규근(KyuKeun Song),오석형(SeokHyung Oh),장동혁(DongHyuk Jang) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.11
The bent-axis type piston pump which is driven by the piston rod works on the way that the piston rod drives the cylinder block, so the taper angle of the piston rod and the swivel angle between the cylinder block and the shaft are very important design factors. If the above factors can not satisfy the conditions of optimum design, the friction loss between the cylinder bore and the piston increases, and the pump can even fail to work under conditions of severe friction and wear. Since the piston reciprocates in the cylinder bore with high velocity, and at the same time it rotates on its own axis and revolves on the center of the cylinder block, the decrease of the volume efficiency generated on account of the leakage between the cylinder bore and the piston. Therefore, to prevent this case, the piston ring is designed at the end of the piston, and the friction characteristics between the piston ring and the cylinder bore are in need of research due to its great influence on the performance of piston pump. Thus, in this paper, the elastohydrodynamic lubrication(EHL) analysis of the film thickness, the pressure distribution and the friction force, have been studied between the piston ring and the cylinder bore in the bent-axis type piston pump. The analyzed results show that friction force is influenced by rotating speed and discharge pressure.
사축식 피스톤 펌프의 피스톤 링과 실린더 보어간의 윤활특성에 관한 연구
정재연(JaeYoun Jung),조인성(IhnSung Cho),백일현(IlHyun Baek),손소화(ShaoHua Sun),신현일(Hyunil Shin),송규근(KyuKeun song),오석형(SeokHyung Oh) 한국트라이볼로지학회 2007 한국트라이볼로지학회 학술대회 Vol.2007 No.6
The bent-axis type piston pump which is driven by the piston rod works on the way that the piston rod drives the cylinder block, so the taper angle of the piston rod and the swivel angle between the cylinder block and the shaft are very important design factors. If the above factors cannot satisfy the conditions of optimum design, the friction loss between the cylinder bore and the piston increases, and the pump can even fail to work under conditions of severe friction and wear. Since the piston reciprocates in the cylinder bore with high velocity, and at the same time it rotates on its own axis and revolves on the center of the cylinder block, the decrease of the volume efficiency generated on account of the leakage between the cylinder bore and the piston. Therefore, to prevent this case, the piston ring is designed at the end of the piston, and the friction characteristics between the piston ring and the cylinder bore are in need of research due to its great influence on the performance of piston pump. Thus, in this paper, the elastic hydraulic oil’s lubrication analyses of the film thickness, the pressure distribution, and the friction force, and so on, have been performed, and the lubrication characteristics between the piston ring and the cylinder bore are explored by the results of the numerical analysis, and it is contributed to realize the higher efficiency and the more advanced performance of the bent-axis type piston pump.
정재연(JaeYoun Jung),조인성(IhnSung Cho),백일현(IlHyun Beak),조재천(JaeCheon Jo),송규근(KyuKeun Song),오석형(SeokHyung Oh) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.6
The bent-axis type piston pump which is driven by the piston rod works on the way that the piston rod drives the cylinder block, so the taper angle of the piston rod and the swivel angle between the cylinder block and the shaft are very Important design factors. If the above factors can not satisfy the conditions of optimum design, the friction loss between the cylinder bore and the piston increases, and the pump can even fail to work under conditions of severe friction and wear. Since the piston reciprocates in the cylinder bore with high velocity, and at the same time it rotates on its own axis and revolves on the center of the cylinder block, the decrease of the volume efficiency generated on account of the leakage between the cylinder bore and the piston. Therefore, to prevent this case, the piston ring is designed at the end of the piston, and the friction characteristics between the piston ring and the cylinder bore are in need of research due to its great influence on the performance of piston pump. Thus, in this paper, the elastohydrodynamic lubrication(EHL) analysis of the film thickness, the pressure distribution and the friction force, have been studied between the piston ring and the cylinder bore in the bent-axis type piston pump. The analyzed results show that friction force is influenced by rotating speed and discharge pressure.
조인성(Ihnsung Cho),정재연(Jaeyoun Jung) 한국자동차공학회 2014 한국 자동차공학회논문집 Vol.22 No.1
To improve the performance of clutch actuator of clutch-by-wire system for commercial vehicles, it is necessary to understand the driving characteristics of the system. To explain and predict the effects of driving characteristics on clutch characteristics, AMESim software is used. The simulation model of clutch-by-wire system is developed in the AMESim environments under the geometrical dimensions and driving mechanisms of the clutch-by-wire system, such as the rotation speed of the DC motor, the gear ratio of the reducer, the design parameters of the release fork, the coefficient of the clutch diaphragm spring, and so on. The results show that the theoretical analysis of the clutch-by-wire system for commercial vehicles using the AMESim software find out the driving characteristics of the clutch actuator, and predict the performance characteristics of the clutch-by-wire system.
김재덕(Jaeduk Kim),송규근(Kyukeun Song),정재연(JaeYoun Jung),진뢰(Lei Chen),성욱곤(Yukun Cheng) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
With the development of global automobile industry, the pollution caused by automobile exhaust gas has become more and more serious, especially NOx pollution. During these years, the government recognizes the problem and legislates to limit the exhaust emission. As the main power source of vehicle, the question how to purify NOx emission for diesel engine has become one of the hotspots. Now, technology of EGR is known as the effective method to purify NOx emission, which is available for diesel engine. diesel engine are introduced in this article. The mechanism of nitrogen oxides formation and how the EGR can reduce the NOx emission are studied, and we have done the test experiment of the diesel engine, The main contents includes: Adapting to the requirement of the emission legislation, an EGR system was applied to a diesel engine to reduce NOx emission. The effects of different EGR rate on the emissions and performances of the engine were investigated by the engine test, in which the EGR rates of different engine mode will be optimized based. The results showed that EGR can reduce NOx emission of this diesel engine significantly under various operation conditions, but it will have negative influence on smoke, the effective torque and the effective specific fuel consumption with the increasing of EGR rates. So there will be an optimum working state of EGR rates under various operation conditions. Through the optimum emission test for EGR, it proves that the optimized EGR strategy can reduce the NOx emission efficiently and limit the negative influence on other emission and the performance of engine.