Hydraulic Design And Test Based On The Transmission System Of Xinjiang C-2 Grain Combine Harvester

In the combine harvester,Full mechanical transmission chassis brings great inconvenience to the streamlining of the machine structure and the arrangement of the core work devices,Due to long mechanical transmission distance and large space.When the mechanical working environment is high-humidity,high-temperature,high-resistance muddy soil,and the heavy load is overloaded,belts will easily age,slip,and fracture,resulting in frequent mechanical failures and high maintenance rates.The high-pressure tubing can be used to deliver the high-pressure hydraulic fluid to the desired location.The hydraulically-driven undercarriage system can avoid the above deficiencies.It is a development trend to replace the mechanical drive chassis with a full hydraulic drive chassis,because of its simple structure and reliable transmission,and it can save a lot of internal space for the organization and facilitate the arrangement of various working parts within the components.This article addresses the environmental characteristics in the production of combine harvesters and the technical conditions for the use of hydraulic transmissions.This article has designed an efficient closed hydraulic drive system,Keep the output gearbox in its walking system and change its traditional mechanical transmission mode to HST(hydraulic stepless speed)transmission mode,based on the chassis of Xinjiang C-2 grain combine harvester.According to the different types of transmission functions and combining the operating characteristics of hydraulic components,select the hydraulic pump,motor,valve and other components,design the hydraulic system and analyze the principle of hydraulic system.And complete theoretical verification of energy loss in hydraulic systems with the designed hydraulic system for power matching,loop analysis and the design of the installation structure of each major hydraulic component by the calculation and selection of hydraulic pump and motor model.AMESim hydraulic computer simulation experiment was performed on the important subsystems(walking system + working system)to verify the operation of the hydraulic system loop under the design operating parameters.And discover the dynamic parameters of the system at work,analyze the dynamic parameters that do not conform to the linear law,analyze the causes of the situation,and find solutions to the problems by analyzing the simulation results.And Solve the problem in the bud.Finally in order to Verify that the system meets the design parameters.A large hydraulic test bench was built to simulate the work environment.The simulation and test show that the system can meet the requirements of the design of the hydraulic transmission system.At the same time,it can be found that the working transmission efficiency of the closed hydraulic system can reach more than 80%,providing good technical parameters for the prototype production.