볼 타입 등속조인트 케이지 강도의 역학적 영향인자 분석

송명의(Myeong-eui Song),임영훈(Young-hun Lim),안성백(Sung-beak An),이인상(In-sang Lee),김정윤(Jung-yun Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11

Constant velocity joint is used for transmitting torque to wheel. Ball joint is popular to outboard type because it allows wheel to bend freely according to steering. Nowadays, the strength requirements of CVJ are being more complicated because of robustness against high engine power and the demand for flexible turning capability in small area. One of the CVJ strength evaluations is quasi-static torsion limitation test, which measures the fracture torque with maximum joint angle on ball joint. Cage web of ball joint determines most fracture strength of CVJ on the test. The study is performed in order to find the reason of cage web weakness with coupled dynamic analysis method. The study shows that firstly, contact force between ball and inner race track at large joint angle makes it between inner race and cage web amplified especially in from 120 to 150 revolution range. Secondly, the kinetic result of cage web’ contact posture for maximum joint angle shows that the phase from 145 to 215 has weak shear strength potential by contact pressure. Finally, the change of track which has bisymmetry shape joint along to shaft direction from joint center shows that the stress of web can be minimized and the strength is very sensitive to track shape

볼 조인트의 코킹 및 유격해석

황석철(Seok Cheol Hwang),김종규(Jong Kyu Kim),서선민(Sun Min Seo),한승호(Seung Ho Han),이권희(Kwon Hee Lee) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.9

볼 조인트는 두 요소 사이에서 회전 및 이동이 원활하도록 돕는 역할을 하는 기계요소이다. 본 연구의 대상인 볼 조인트는 중대형 승용차량용 볼 조인트로서 너클과 컨트롤 암의 운동을 돕는다. 본 연구에서는 볼 조인트의 공정 및 시험에 관한 해석 방법을 제안하고자 한다. 볼 조인트의 제작공정은 플러깅 공정과 스피닝 공정으로 나눌 수 있다. 볼 조인트의 제작공정 및 성능시험을 암시적 수치 적분법을 적용한 상용 동역학 프로그램인 NX DAFUL 2.0 을 사용하여 해석하였다. 또한 설계요구조건을 정의하기 위하여 볼 스터드에 작용하는 응력의 평균 및 분산을 반응치로 설정하였다. 그리고 완성된 볼조인트의 유격량을 시험하는 유격시험해석을 통해 최적의 설계를 제안하였다. Ball joint is a rotating and swiveling element that is typically the interface between two parts. In an automobile, the ball joint is the component that connects the control arms to the steering knuckles by playing a role of bearing. The ball joint can also be installed in linkage systems for motion control applications. This paper describes the simulation strategy for a ball joint analysis, considering manufacturing process. Its manufacturing process can be divided into plugging and spinning. Then, the interested response is selected as the stress distribution generated between its ball and bearing. In this paper, a commercial code of NX DAFUL 2.0 using an implicit integration method is introduced to calculate the response. In addition, the gap analysis is performed to investigate the fitness. Also, the optimum design is suggested through case studies.

플라스틱 사출형 볼조인트의 성능에 대한 사출성형 조건의 최적화

박종현(Jonghyun Park) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6

The important basic performance of ball joint is rotational torque and axial stiffness. In case of plastic injection molding type ball joint, deflection caused by volumetric shrinkage of injection molded part greatly influence ball joint performance. The deformation of the injection molded part generates the contact pressure between the ball stud and the plastic bearing, and ultimately shows the rotational torque and axial stiffness characteristics of the ball joint. In this study, the effects of injection molding conditions on the rotational torque and axial stiffness of plastic injection ball joint were evaluated and optimized injection molding conditions showing optimal rotational torque and axial stiffness. Injection moldability of the plastic injection part was evaluated by Moldflow for injection molding analysis, and rotational torque and axial stiffness were evaluated by Abaqus for structural analysis. Design of experiment(DOE) method was used to identify injection molding conditions that affect ball joint performance and to determine optimal injection molding conditions.

자동차 서스펜션용 볼 시트 사출성형품 개발

예상돈(Sang-Don Ye),민병현(Byeong-Hyeon Min) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.4

Injection molding process is one of the popular manufacturing methods to produce plastic parts with high efficiency and low cost. Ball seat for automobile suspension is made by an injection molding process as a part to support pivot function of ball joint consisted of ball stud and housing. It is necessary for a ball seat to have a dimensional stability in the three dimensional inner area to be contacted with ball stud. In this paper, the dimensional stability of inner surface is indirectly analyzed by checking the difference of inner diameter around the circumferential direction and the thickness variation at the top part of ball seat. Measurement was performed by using the coordinate measuring machine and the fixture to hold ball seat. Optimization of injection molding processes such as injection time, cooling time and temperatures of cylinder barrel was derived to reduce the difference of inner diameter and the thickness variation at the top part of ball seat based on the Taguchi method.

볼 조인트의 코킹 및 유격해석

황석철(Seok-Cheol Hwang),김종규(Jong-Kyu Kim),서선민(Sun-Min Seo),김영준(Young-Jun Kim),이동우(Dong-Woo Lee),박영철(Young-Chul Park),이권희(Kwon-Hee Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11

Ball joint is a rotating and swiveling element that is typically the interface between two parts. In an automobile, the ball joint is the component that connects the control arms to the steering knuckles by playing a role of bearing. The ball joint can also be installed in linkage systems for motion control applications. This paper describes the simulation strategy for a ball joint analysis, considering manufacturing process. Its manufacturing process can be divided into plugging and spinning. Then, the interested response is selected as the stress distribution generated between its ball and bearing. In this paper, a commercial code of NX DAFUL 2.0 using an implicit integration method is introduced to calculate the response. In addition, the gap analysis is performed to investigate the fitness. Also, the optimum design is suggested through case studies.

Robust Design of an Automobile Ball Joint Considering the Worst-Case Analysis

Bong-Su Sin(신봉수),Seong-Uk Kim(김성욱),Jong-Kyu Kim(김종규),Kwon-Hee Lee(이권희) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.1

An automobile ball joint is the element for connecting the control arm and the knuckle arm, allowing rotational motion. The ball joint consists of the stud, plug, socket, and seat. These components are assembled through the caulking process that consists of plugging and spinning. In the existing research, the pull-out strength and gap stiffness were calculated, but we did not consider the uncertainties due to the numerical analysis and production. In this study, the uncertainties of material property and tolerance are considered to predict the distributions of pull-out strength and gap stiffness. Also, pull-out strength and gap stiffness are predicted as the a distribution rather than one deterministic value. Furthermore, a robust design applying the Taguchi method is suggested.

볼조인트 회전토크와 강성에 대한 부품공차내의 설계 민감도 분석

박종현(Jonghyun Park) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6

In order to investigate the rotational torque and stiffness characteristics of the ball joint by an analysis, the finite element model and the analysis process were constructed and the finite element model was verified through comparison with the test results. The rotational torque and stiffness characteristics of the ball joint are influenced by the tolerance condition of parts. Design of experiment(DOE) was used to set the important design parameters for the ball joint performance and to analyze the sensitivity in the tolerance region of design variables. From this, the main design parameters for ball joint rotational torque and stiffness performance were established, and the base technology for ball joint design was acquired.

볼시트의 치수안정성에 관한 연구

민병현(Byeong-Hyeon Min),예상돈(Sang-Don Ye) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5

Injection molding process is one of the popular manufacturing methods to produce plastic parts with high efficiency and low cost. Ball seat for automobile suspension is made by an injection molding process as a part to support pivot function of ball joint consisted of ball stud and housing. It is necessary for a ball seat to have a dimensional stability in the three dimensional inner area to be contacted with ball stud. In this paper, the dimensional stability of inner surface is indirectly analyzed by checking the thickness variation at the top part of ball seat. Measurement was performed by using the coordinate measuring machine and the fixture to hold ball seat. Optimization of injection molding processes such as injection time, cooling time and temperatures of cylinder barrel was derived to reduce the difference of the thickness variation at the top part of ball seat based on the Taguchi method.

가장자리 하중조건에서의 볼 조인트 마찰소음 연구

강재영(Jaeyoung Kang) 대한기계학회 2014 大韓機械學會論文集A Vol.38 No.7

본 연구에서는 볼 조인트 구조에서 가장자리 하중을 받고 있을 때의 마찰 소음을 이론적으로 연구하였다. 구형 베어링 구조체와 반구 형태의 소켓간 마찰접촉 모델을 수학적으로 유도하여 동역학적 운동방정식을 전개하였다. 그 결과 볼 조인트부 굽힘 모드가 마찰에 의해 불안정할 수 있음을 보였고, 축력 및 접촉강성이 볼 조인트 동적 불안정성에 크게 영향을 주고 있음을 보였다. 반면 소켓의 틸팅 각도는 동적 불안정성에 크게 기여하지 않음을 보였다. This study provided the analytical model describing the friction-induced noise in the ball joint system under the edge loading condition. The frictional and conformal contact kinematics between the spherical bearing and the hemispherical socket was derived and the dynamic equations of the perturbed motion were established. The numerical results revealed that the bending modes of the ball joint system can become unstable due to friction, and the axial load and contact stiffness strongly influenced the dynamic instability. In contrast, the tilting angle of the socket was not found to significantly contribute to the dynamic instability of the ball joint.

차량용 볼조인트에 사용되는 볼스터드의 피로수명 예측방법 및 선재 제조공정에 따른 피로수명 비교

조규영(Kyuyeong Cho),황효상(Hyosang Hwang),이윤건(Yoongeon Lee) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11

In this study, to increase the reliability of prediction of fatigue life, ball studs were classified into the wire rod manufacturing processes and tested, and the results were analyzed. Ball stud uses cold heading quality wire using chromium-molybdenum steel as a material, and three types of wire rod manufacturing processes are typically used: (S)AIP, PASAIP, and PSASAIP. Loads were selected based on the results of FE-analysis, and fatigue tests were conducted on samples classified by the manufacturing process. As a result of the fatigue test, it was confirmed that there was a difference in fatigue life according to the manufacturing process of the wire rod. A method to reduce errors by generating a stress life curve according to the wire rod manufacturing process was proposed.