Abstract
Hydromechanical continuously variable transmission (HMCVT) is capable of bearing large torque and has wide transmission range, which is suitable for high-power tractors. Dynamic characteristics could influence the tractor life, especially in a high-power tractor. Wet clutch is the crucial component in the HMCVT, which could smooth and soft power transmission. Therefore, it is important to study the dynamic characteristics and implement the wet clutch test of HMCVT. In this paper, AMESim is used to establish virtual models of gearbox, pump-controlled hydraulic motor system, and shifting hydraulic system. Then, a simulation study of tractor operation under working condition is carried out. The internal and external meshing forces of the planetary row are analyzed. Finally, the wet clutch engagement process of HMCVT in the high-power tractor is tested to verify the oil pressure. The simulation results show that the values of internal and external meshing force become larger as the throttle opening increases. At the moment of shifting change, the meshing forces of the planetary gear have great impact. The clutch test shows that the trend of the oil filling curve obtained from the bench test is similar to that obtained from the theoretical curve, which verifies the simulation results.
Highlights
Yuan Chen,1 Yu Qian,1 Zhixiong Lu,1 Shuang Zhou,1 Maohua Xiao,1 Petr Bartos,2 Yeping Xiong,3 Guanghu Jin,4 and Wei Zhang5
E simulation results show that the values of internal and external meshing force become larger as the throttle opening increases
Introduction e main function of the tractor is to be used in conjunction with various traction and driving machines to complete agricultural field operations, earthwork engineering operations, transportation operations, and stationary operations [1]. e transmission performance of the gearbox will have an important impact on the tractor and its transmission system. e hydromechanical continuously variable transmission (HMCVT) has attracted extensive attention in recent years [2,3,4,5]
Summary
By separately controlling the engagement of wet clutches C1, C2, and C3, the power can be transmitted to the output shaft In this process, stepless speed regulation can be realized in each section by controlling the displacement ratio of the variable pump. Where qp is the flow of the variable pump, e is the displacement of the pump, swash is the throttle opening of the pump, Tp is the shaft torque of the pump, and pAP and pBP are the inlet and outlet oil pressure.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
