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A Study on the Design of Transmission Oil-Seal Using 2D Finite Element Analysis
Hyun-cheol Yoon(윤현철),Gi Hyun Jeon(전기현),Ju Yong Choi(최주용) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.1
Oil seals are most essential parts in mechanical lubrication system to maintain the close gaps between stationary and high rotating components, and to help prevent oil leakages. Oil seals also can prevent harmful contaminants entering from outside to machinery, especially in severe environments. Therefore, the oil seals have an important performance in the machinery components. The performance of the oil seals are influenced by the design variables such as amount of interference gap between the main lip and shaft, the angle of main lip at air and oil sides and the distance between the garter spring and main lip. In the present study, a finite element analysis was performed to evaluate the oil seal performance with the considerations of number of oil seal dust lips and angle of the lip at oil side with the different design variables. As a result from the FEM analysis, the stress and contact pressure distributions was derived, based on this, performance of the sealing and durability were determined.
최현진(Hyun-Jin Choi),최성대(Seong-Dae Choi) 한국기계가공학회 2010 한국기계가공학회지 Vol.9 No.3
This study aimed to enhance the durability by distributing the stress concentration at the contact and increasing the mechanical characteristics, as well as by changing the surface shape for LIP in the low-pressure seal among oil seals installed to the power steering of automotive. Accordingly, results were derived from comparisons and reviews with oil seals under the existing mass production by carrying out the performance tests after designs and productions are done with the addition of embo shapes on the surface of LIP in the low-pressure seal. As a result of this study, it has been identified that the durability of oil seals with the addition of embo shapes was enhanced with higher radial force and less variation in the internal diameter for the LIP. In addition, it was seen that the sealing ability for those oil seals is superior to the existing oil seals as their rotational torque values are less than those of the existing oil seals.
최현진(Hyunjin Choi),박철우(Chulwoo Park),이종철(Jongcheol Lee),김종갑(Jonggab Kim),최성대(Seongdae Choi) 한국자동차공학회 2011 한국 자동차공학회논문집 Vol.19 No.2
This study analyzed the mechanical characteristics and evaluated their subsequent performance for two types of seals which reinforced characteristics with lower friction and anti-wear functions among the foremost important features in the automotive engine seals; one with the addition of glass fiber to PTFE(Polytetrafluoro ethylene); the other with the addition of self-lubricant molybdenumin addition to the glass fiber. Based on the configuration design of seal installed to the front part in the automotive engine, this study carried out interpretations on the stress and reaction for those two types of oil seals to compare the maximum stress and contact load generated from the seal steel, rubber and PTFE lip. This study also verified the stress concentration and anti-wear performance through the coefficient of friction, torque and durability test by producing two types of PTFE seals actually.
윤현철(Hyun-cheol Yoon),최주용(Ju Yong Choi) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.11
Oil seals have a great effect on transmission performance and durability. In this study, the optimal rubber mix was derived using dispersion analysis to obtain excellent oil-seal rubber properties. ANOVA was performed twice. The factors were polymers, carbon, magnesium oxide, and calcium hydroxide, which were used as four factors in ANOVA. The response factors were four items (hardness, tensile strength, elongation rate, and compression deformation) obtained through an experiment with a confidence level of 95%. In the first ANOVA, 168 tests were performed, and in the secondary ANOVA, 24 physical tests were conducted using polymers and carbon derived from the primary ANOVA. Through the ANOVA, we derived a rubber mixture recipe.
최현진(Hyunjin Choi),박철우(Chulwoo Park),박철휴(Chulhue Park),이종철(Jongcheol Lee),김종갑(Jonggab Kim),최성대(Seongdae Choi) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The most important properties of the automotive engine seal are the low friction and the abrasion resistance. In order to strengthen these properties, the two types of seal are developed and analyzed. One seal is made by mixing the PTFE and the glass fiber and the other is made by mixing the PTFE, the glass fiber and the molybdenum. The analysis of the stress and the reaction force are carried out using the shape design of seal, which is mounted on the front part of the automotive engine. We analyzed the maximum stress and the contact weight of PTFE lip part and then made the two types of PTFE seal. Finally, we evaluated the stress concentration and the abrasion resistance through the coefficient of friction and torque and endurance test.
인공신경망과 비전 시스템을 이용한 자동차용 오일씰의 검사
노병국(Byoung-Gook Loh),김기대(Gi Dae Kim) Korean Society for Precision Engineering 2004 한국정밀공학회지 Vol.21 No.8
The Classification of defected oil-seals using a vision system with the artificial neural network is presented. The artificial neural network for classification consists of 27 input nodes, 10 hidden nodes, and one output node. The selection of the number of the input nodes is based on an observation that the difference among the defected, non-defected, and smeared oil-seals is greatly pronounced in the 26 step gray-scale level thresholding. The number of the hidden nodes is chosen as a result of a trade-off between accuracy and computing time. The back -propagation algorithm is used for teaching the network. The proposed network is capable of successfully classifying the defected from the smeared oil-seals which tend to be classified as the defected ones using the binary thresholding. It is envisaged that the proposed method improves the reliability and productivity of the automotive vision inspection system.
누유방지를 위한 오일씰 선정에 관한 연구 - 자동차분야 및 국방분야 사례를 중심으로
박동민(Dong-Min Park),임덕균(Deok-Gyun Im),박종규(Jong-Kyu Park) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.05
This paper is study for the selection of oil seals, focusing on research cases in the automotive and defense fields for preventing oil leakage. Oil seals are parts that prevent leakage of working fluid and substance, and it is widely used in various fields due to their simple structure and low cost characteristics. It is expected to serve as a reference material for the selection of oil seals and failure cause analysis of similar equipment. In order to improve the sealing performance of the oil seal, factors such as the prevention of substance penetration, the stress dispersion to increase the durability life, the temperature of the oil seal application equipment, and the surface roughness and hardness of the assembly counterpart must be considered.