This study investigated the root causes of wheel hub assembly looseness and abnormal brake pad wear observed during a 32,000 km durability driving test of a military medium truck. Structural analysis and component-level durability tests were conducted to identify the failure mechanisms and evaluate improvement measures. Test conditions were established based on relevant regulations and previous studies, and braking force and braking torque equations were derived through mathematical modeling. The results showed that the spacer used to fix the brake disc in the original design did not satisfy the required safety factor greater than 1.0. Furthemore, a wheel hub assembly torque durability test under more severe conditions than the original test was performed, and the results demonstrated a significant improvement in durability perfomance.

Abstract
1. 서 론
2. 휠허브 조립체 구조 및 원인분석
    2.1 휠허브조립체 구조
    2.2 문제 발생 현상
    2.3 문제현상 발생 원인분석 방안
3. 휠허브 조립체 설계 개선 및 검증결과
    3.1 휠허브 조립체 설계 개선방안
    3.2 개선 방안 검증 결과
3. 결 론
References

• 오영환(Kia Corporation(Special Vehicle R&D center)) | Younghwan Oh
• 김선진(Senior Researcher, Defense Agency for Technology and Quality.) | Seon-Jin Kim Corresponding author
• 박진원(Defense Agency for Technology and Quality) | Jinwon Park
• 최창익(Defense Agency for Technology and Quality) | Changik Choi
• 배성주(Defense Agency for Technology and Quality) | Sungju Bae
• 오창영(Defense Agency for Technology and Quality) | Changyoung Oh
• 김진일(Defense Agency for Technology and Quality) | Jinil Kim