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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.
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.
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.
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.