55kW급 농업용 트랙터 정유압 기계식 변속기 설계 = Design of the Hydro-Mechanical Transmission for a 55kW-Class Agricultural Tractor

다국어 초록 (Multilingual Abstract)

The purpose of this study was to suggest design criteria for the HMT (hydro-mechanical transmission) of a 55 kW-class agricultural tractor, develop a simulation model, and evaluate its performance such as axle rotational speed, tractor speed, and power transmission efficiency. In this study, the HMT comprised a compound planetary gear and a HSU (hydro-static unit), and the compound planetary gear comprised two planetary gear sets. The HMT has three gear stages, and the maximum tractor speed was selected as 40 km/h. The simulation time was set at 2736 hours considering the lifetime of the tractor, and the simulation was performed for each gear stage at the engine-rated power conditions. As a result of the simulation, the axle rotational speeds for each gear stage were 39, 77, and 158 rpm, respectively. The range of tractor speed for each gear stage were 1.05-10.22 km/h, 10.74-20.17 km/h, and 20.70-41.40 km/h, respectively. The APE (absolute percentage gear) for the tractor’s maximum speed between target value and simulation results were 2.20%, 0.85%, and 3.50%, respectively. Also, the power transmission efficiency for each gear stage were 0-75%, 72-81%, and 69-81%, respectively. The simulation results for the power transmission efficiency of the HMT were similar with the results of the previous research. This was a basic study on the development of the HMT for an agricultural tractor. In future studies, it is necessary to develop a tractor platform and evaluate the performance. The comparison between the simulation model and the HMT tractor should be performed.

참고문헌 (Reference)

1 김용주, "로타리 경운작업 시 트랙터 PTO 가혹도 평가" 한국농업기계학회 36 (36): 163-170, 2011

2 이대현, "트랙터의 포장작업에 따른 소요동력 분석" 성균관대학교 대학원 2011

3 정동수, "트랙터용 기계-유압식 무단변속기의 시험평가에 관한 연구" 한국신뢰성학회 19 (19): 275-283, 2019

4 배명호, "지게차용 기계유압식 무단변속기의 기어류에 대한 강도해석" 사단법인 유공압건설기계학회 13 (13): 45-51, 2016

5 김완수, "주요 농작업에 따른 78kW급 농업용 트랙터의 소요 동력 분석" 대한기계학회 43 (43): 911-922, 2019

6 심동국, "정유압-기계식 변속기의 성능 특성과 형식 선정을 위한 설계 변수" 한국농업기계학회 36 (36): 422-433, 2012

7 문강현, "스풀형 압력제어밸브의 동특성 해석" 사단법인 유공압건설기계학회 15 (15): 61-66, 2018

8 한성길, "복합유성기어의 강도 및 내구성 해석" 한국기계가공학회 13 (13): 28-34, 2014

9 김용주, "베일러 작업 시 트랙터 소요동력 분석" 한국농업기계학회 36 (36): 243-251, 2011

10 김완수, "디스크플라우 및 로타리 작업에 따른 78 kW급 트랙터 PTO 가혹도 평가" 사단법인 유공압건설기계학회 16 (16): 23-31, 2019

11 성덕환, "동력특성과 속도비를 고려한 3축 정유압 기계식 변속기의 설계 연구" 대한기계학회 26 (26): 18-2623, 2002

12 공민규, "다단 변속기의 강도설계 검증에 관한 해석연구" 경상대학교 대학원 2012

13 김수철, "농업용 트랙터의 연료 소비 효율 등급화" 한국농업기계학회 35 (35): 69-76, 2010

14 배명호, "기계유압식 무단변속기용 기어트레인에 대한 위험속도 해석" 사단법인 유공압건설기계학회 14 (14): 71-78, 2017

15 김완수, "Work load analysis for determination of the reduction gear ratio for a 78 kW all wheel drive electric tractor design" 농업과학연구소 46 (46): 613-627, 2019

16 김택진, "Strength analysis of mechanical transmission using equivalent torque of plow tillage of an 82 kW-class tractor" 농업과학연구소 46 (46): 723-735, 2019

17 D. H. Sung, "Power Transmission Characteristics of Hydro-Mechaniacal Transmission" 25 (25): 1854-1862, 2001

18 홍순중, "Performance Evaluation of a Driving Power Transmission System for 50 kW Narrow Tractors" 한국농업기계학회 43 (43): 1-13, 2018

19 M. Mattetti, "Optimal criteria for durability test of stepped transmissions of agricultural tractors" 178 : 145-155, 2019

20 최석환, "Modeling and Simulation for a Tractor Equipped with Hydro-Mechanical Transmission" 한국농업기계학회 38 (38): 171-179, 2013

21 S. U. Park, "Fatigue life evaluation of spiral bevel gear of transmission using agricultural workload of tractor" Chungnam National University 2019

22 D. J. Kim, "Developments of HSU and Transmission Control Technology for Continuously Variable Transmission of Tractor and Forklift" 15 (15): 51-60, 2018

23 김완수, "Development of simulation model for fuel efficiency of agricultural tractor" 농업과학연구소 43 (43): 116-126, 2016

24 Y. J. Kim, "Development of automation technology for manual transmission of a 50 HP autonomous tractor" 51 (51): 20-22, 2018

25 D. S. Jung, "Development of Hydro-Mechanical Transmission for Tractor" 15 (15): 70-76, 2018

26 Y. J. Park, "Analysis of Power Transmission Characteristics on the Hydromechanical Transmission for Agricultural Tractor" 12 (12): 96-100, 2015

27 W. Kim, "Analysis of Power Transmission Characteristics for Hydro-Mechanical Transmission Using Extended Network Theory" 20 (20): 1426-1435, 1996

28 Korean Agricultural Machinery Industry Cooperative, "Agricultural Machinery Yearbook Republic of Korea"

29 정규홍, "2-모드 기계유압식 무단변속기의 성능 및 전달효율해석" 한국자동차공학회 13 (13): 90-98, 2005