본문 바로가기 주메뉴 바로가기
22대 대한민국 국회 국회정보길라잡이 국회의원검색
회원가입 로그인
HOME

정보검색

소장정보 검색

국회도서관 홈으로 정보검색 소장정보 검색
결과 내 검색 동의어 포함
결과 내 검색 동의어 포함

-

목차보기

표제지

목차

Ⅰ. 서론 9

1.1. 연구 배경 9

1.2. 연구 목적 11

1.3. 이론적 배경 12

1.3.1. 트랙터 변속기 12

1.3.2. 기어 강도 설계 13

1.3.3. 기어 손상 유형 16

1.3.4. 기어 강도 해석 19

Ⅱ. 재료 및 방법 26

2.1. 공시 트랙터 26

2.2. 포장시험 29

2.3. 기어 손상 분석 31

2.3.1. 부변속 A단 31

2.3.2. 부변속 B단 32

2.4. 기어 재질 변경 34

2.5. 시뮬레이션 해석 34

2.5.1. 시뮬레이션 모델링 34

2.5.2. 시뮬레이션 해석 조건 37

2.6. 차축 부하 다이나모 시험 38

2.6.1. 가속 수명 시험 38

2.6.2. 차축 다이나모 시험 장치 구성 40

2.6.3. 차축 다이나모 시험 조건 42

Ⅲ. 결과 및 고찰 45

3.1. 시뮬레이션 모델 개발 및 검증 45

3.2. 재질 변경에 따른 시뮬레이션 해석 결과 48

3.2.1. 부변속 A단 48

3.2.2. 부변속 B단 51

3.3. 차축 다이나모 시험 결과 55

3.3.1. 부변속 A단 55

3.3.2. 부변속 B단 56

3.4. 기어 수명 해석 결과 비교 57

Ⅳ. 결론 및 요약 59

LIST OF REFERENCES 61

ABSTRACT 66

표목차

Table 1. Specification of 86 kW agricultural tractor used in this study 27

Table 2. Specification of implements used in this study 29

Table 3. Chemical composition of alloy steel for machine structure use according to gear materials 34

Table 4. Specification of main shift gears for 86 kW class agricultural tractor used in this study 36

Table 5. Specification of range shift gears for 86 kW class agricultural tractor used in this study 37

Table 6. Fatigue damage exponent by heat treatment 40

Table 7. Conditions of axle dynamometer test used in this study 44

Table 8. Results of service life for range shift A driving gear of 86 kW class agricultural tractor transmission 49

Table 9. Results of service life for range shift A driven gear of 86 kW class agricultural tractor transmission 51

Table 10. Results of service life for range shift B driving gear of 86 kW class agricultural tractor transmission 53

Table 11. Results of service life for range shift B driven gear of 86 kW class agricultural tractor transmission 55

Table 12. Comparison of life for range shift gears between simulation analysis and axle dynamo test 58

그림목차

Figure 1. Power flow of tractor for agricultural transmission 12

Figure 2. Gear wear 16

Figure 3. Gear plastic flow 17

Figure 4. Gear pitting 18

Figure 5. Gear breakage 19

Figure 6. A photo of 86 kW class agricultural tractor for field test used in this study 26

Figure 7. 3D model of agricultural tractor transmission used in this study 28

Figure 8. Power flow of agricultural tractor transmission used in this study 28

Figure 9. C type method for agricultural field operation used in this study 30

Figure 10. Results of field test for range shift A gear of 86 kW class agricultural tractor 31

Figure 11. View of gear plastic flow by stages 32

Figure 12. Results of field test for range shift B gear of 86 kW class agricultural tractor 33

Figure 13. Determination of normal chordal dimensions of tooth root critical section for ISO 6336 : Method B (external gears) 33

Figure 14. KISSsoft interface used in this study 35

Figure 15. Inverse power model 39

Figure 16. Configuration of the axle dynamometer system used in this study 41

Figure 17. A photo of the axle dynamometer test of 86 kW class agricultural tractor used in this study 42

Figure 18. Engine performance diagram of 86 kW class agricultural tractor 43

Figure 19. Simulation model of transmission for 86 kW class agricultural tractor transmission used in this study 45

Figure 20. Results of bending safety factor for transmission of 86 kW class agricultural tractor transmission 46

Figure 21. Results of contact safety factor for transmission of 86 kW class agricultural tractor transmission 47

Figure 22. Results of safety factor for range shift A driving gear of 86 kW class agricultural tractor transmission 48

Figure 23. Results of safety factor for range shift A driven gear of 86 kW class agricultural tractor transmission 50

Figure 24. Results of safety factor for range shift B driving gear of 86 kW class agricultural tractor transmission 52

Figure 25. Results of safety factor for range shift B driven gear of 86 kW class agricultural tractor transmission 54

Figure 26. Results of dynamometer test for range shift A gear of 86 kW class agricultural tractor transmission 56

Figure 27. Results of dynamometer test for range shift B gear of 86 kW class agricultural tractor transmission 57

초록보기

 This study was conducted to secure the durability of the tractor transmission as a basic study on the development and optimal design of tractor transmissions. A field test was conducted using an 86 kW agricultural tractor for plow and rotary tillage, which are typical agricultural operations. The plow and rotary tillage were performed at F10 (7 km/h) and F8 (4 km/h) gear stages, respectively. The field operation was completed after around 107 hours due to transmission noise and operational problems such as forward and reverse. As a result of disassembling the transmission, it was found that range shift A and B gears were damaged. In the case of range shift A gear, it is judged that plastic deformation occurred due to low contact stress, and in case of range shift B gear, the bending stress was low and thus gear tooth breakage occurred. The simulation results showed that the contact safety factor of the range shift A gear was the lowest, and the bending safety factor of the range shift B gear was the lowest. Accordingly, it was judged that the simulation and field test results appeared the similar trend to each other. In order to secure durability of the transmission, four materials of alloy steel for machine structural use such as SCr420, SNCM220, SCM822, and SNC815 were selected, and the safety factor and service life of the damaged range shift gears were analyzed according to gear materials. As a result of simulation analysis, SCM822 material satisfied the design target life and was selected as a material for change. The range shift A and B gears were changed to SCM822, and an axle dynamometer test was performed for verification of the modified transmission. After conducting the axle dynamometer test, the transmission was disassembled and it was confirmed that the range shift A and B gears were in normal condition. Therefore, it is determined that the durability of the transmission has been secured by satisfying the target life. In the future, the simulation model of transmission for 86 kW class agricultural tactor is expected to be utilized for development of tractor transmission, cost reduction, and optimal design.

추천서가 (다양한 추천 자료를 만나보세요)

권호기사보기

권호기사 목록 테이블로 기사명, 저자명, 페이지, 원문, 기사목차 순으로 되어있습니다.
기사명 저자명 페이지 원문 기사목차