Abstract
Energy-saving and emission reduction has become the theme of the world. The wheel loader has a harsh working environment, complicated working conditions, and drastic changes in load, and the performance of the engine cannot be fully utilized. Therefore, the variable speed transmission of vehicles plays a vital role in improving the efficiency and performance of the vehicle. This paper establishes the general characteristic equations for the input coupling type of hydro-mechanical continuously variable transmission (HMCVT) based on the wheel loader and determines reasonable structural forms for connection of working conditions. It establishes the general efficiency equation for the reasonable structural form for efficiency analysis and presents a method of co-validation of the simulation and test for making the results of efficiency more accurate. Through this method, the transmission performance is more accurately analyzed, which provides an important guiding role and validation for the early design of HMCVT. Eventually, it gets reasonably optimized products and reduces the design cost and cycle.
Highlights
The wheel loader, as a kind of off-highway vehicle, has complicated working conditions and drastic changes in load
The input power is divided into two paths through the power split device, and the power of the two paths will be combined through the power junction device (PJD)
Torque and speed of Variable Displacement Hydraulic Pump (VP) and Fixed Displacement Hydraulic Motor (FM) are obtained through simulation analysis, and the loading system is controlled by the control unit according to the simulation date
Summary
The wheel loader, as a kind of off-highway vehicle, has complicated working conditions and drastic changes in load. The conventional transmission applied to the wheel loader is the mechanical transmission with torque converter. Many scholars have studied the traditional transmission with torque converter [1,2,3]. Hydro-mechanical continuously variable transmission (HMCVT) is a kind of power split transmission. The input power is divided into two paths (mechanical transmission and hydrostatic CVT) through the power split device, and the power of the two paths will be combined through the power junction device (PJD). It can achieve high-efficiency power transmission through mechanical transmission and CVT through hydrostatic transmission
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