The premature failure of the universal joint connecting the drive gear box and the cooling fan caused a deterioration in serviceability and operability. Universal joint is a device that transmits engine power to a cooling fan. Internal pin breakage and shaft separation can cause secondary damage such as cooling fan malfunction and radiator damage caused by component failure. The purpose of this paper is to analyze the damage phenomenon of universal joints caused by bundles in SPVs and to improve them. In order to verify the improvement, a single part test and a system conformance test were conducted, and durability test was conducted to confirm the improvement effect on the improved prototype. Through these, the effects of increasing the durability of the improved product were estimated.

ABSTRACT
1. 서 론
2. 고장원인 분석
    2.1. 유니버셜조인트 구성 및 특징
    2.2. 파손 원인분석
3. 품질개선 및 검증
    3.1 설계변경 방안
    3.2 단품 시험
    3.3 운용적합성 시험
4. 내구성 평가
5. 결 론
References

• 남윤욱(국방기술품질원) | Yoon-Wook Nam 교신
• 김병현(국방기술품질원 기동화력센터) | Byung-Hyun Kim
• 김용수(국방기술품질원) | Young-Soo Kim
• 이승준(한화디펜스) | Seung-Jun Lee
• 김윤석(우진정밀) | Yun-Seok Kim
• 박영민(국방기술품질원) | Young-Min Park