Modeling Simulation and Validation of a Tractor Wet Clutch Controlled by Proportional Valve

2021 International Journal of Automotive Science and Technology  
Wet clutches are being used more than ever in highway, agricultural, and construction vehicles as well as mining machinery, marine power and maneuvering systems, textile and packaging machines, presses, machine tools, and other production machines to transfer power and torque. The general advantages of wet clutches include a low moment of inertia, small application volumes, high power/weight ratio, large torque capacity, high torque in modular design, high-temperature capacity, high strength
more » ... reliability, and excellent controllability [1]. Due to its high torque carrying capacity and ease of use, wet clutches are preferred in tractor tail shafts in recent years to power auxiliary equipment. When wet clutches are compared to dry clutches, their dimensions, torque carrying capacities, heat removal, and temperature control make their functional lifetime much longer [2] . Their functioning is influenced by variables such as the load, transmission fluid temperature, engine torque, and power. The fluid pressure must be controlled during engagement and disengagement, and the hydraulic system must operate precisely and swiftly. To use an electro-hydraulic proportional valve and to maintain the pressure constant behind the valve, the pressure relief valves must work in harmony. The proportional valve must be controlled by a controller that exhibits a stable behavior. If the specified variables are ignored, the friction elements in the clutch, such as the friction discs, wear out quickly due to sliding friction, reduce the life span and lead to failure in brief periods (Fig. 1) . In this paper, the design of a new wet clutch for the actuation of the power take-off (PTO) unit in the transmission of an agricultural machine is shared. The objective is to design an electro-hydraulic system for optimum engagement of the PTO output using a wet clutch and to develop a practical and effective method for the design and analysis of future models. A one-dimensional mathematical model of the wet clutch and electro-hydraulic control system was developed. After modeling the designed concept and a series of simulations, the results were verified by a limited number of tests. Variations of pressure and shaft speed were investigated in terms of the retarding torque. Various actuation cases of the electro-hydraulic circuit were simulated, and the results are evaluated. Design of Wet Clutches Wet clutch systems are mostly laminated and multi-plate. The total area of the friction surface is increased by increasing the number of
doi:10.30939/ijastech..797276 fatcat:btj4xltsnvcfpksw2c34ttes54