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Castle Nut 체결에 대한 BJ Stem부 나사의 신뢰성 평가
한상원(Sangwon Han),윤동영(Dongyoung Yoon),권철웅(Chelwoong Kwon) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The castle nut has bean used in front wheel drive vehicle to assemble the half shaft. However when it tighten a castle nut, a large axial force is applied to the thread of BJ stem. This may cause stress concentration to the BJ Stem and also affect breakdown of the thread. Therefore, reliability estimation for the castle nut is required. The reliability estimation of the castle nut is performed using theoretical method, FEM and is verified by the real test. In this paper, the analysis methods to predict axial force of the castle nut is proposed. First, the theoretical method of evaluating the axial force and tensile stress of the castle nut is presented. Second, the tensile test and axial force test procedure for the castle nut is also proposed. Therefore, the reliability of the proposed methods was evaluated according to the comparison. In addition, these two results of proposed methods are applied to the analysis of the safety rate.
한상원(Sangwon Han),윤동영(Dongyoung Yoon),권철웅(Chelwoong Kwon),박정률(Jungryul park),김정윤(Jungyun Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The wheel nut plays a role as installation of wheel & tire Assembly for chassis corner module. The wheel nut is one of the most frequent reorganization parts. On the other hand, it also should be maintained its fastening state for the safety. However when it driving a vehicle, the various causes occur to reduce the fastening force. Inadequate fastening force of wheel nut leads slip and rotation to wheel and hub bolt. This may cause shear-stress concentration to the hub bolt and also affect breakdown of it. This phenomenon is closely connected with noise and vibration. In this paper, the experimental methods to estimations of fastening force reduced is proposed. Also this estimates the fastening force of wheel nut as fastening condition and suggest an appropriate fastening condition.