Research On Rotary Motor Assembly Technology Of Excavator And Joint Simulation Of Rotary System

Excavators slewing hydraulic motor assembly refers to the axial piston motor and planetary reducer that are integrated in the same shell. But, due to its structural limitations of the slewing hydraulic motor assembly housing space by the size,it need to have two characteristics of compactness and miniaturization while being able to drive high power. Therefore, the planetary reducer of excavators slewing hydraulic motor assembly need to have higher power density and match well with the axial piston motor. So, it put forward higher requirements about this level of design and manufacture on the planetary reducer of excavators hydraulic motor assembly.Research significance of hydraulic motor assembly is mainly to make sure that hydraulic motor outputs torque and rotational speed as needed, the bearing capacity of the reducer must meet certain load as required and the integrated housing of strength and fatigue durability and reliability need meet the requirements. First, the hydraulic motor need to match well with planetary reducer, then hydraulic motor reducer assembly can pursue volume miniaturization and lightweight and power efficient.This thesis studies the characteristics of slewing motor technology assembly, that starts with researching structural analysis of the planetary reducer and dynamic performance of excavators slewing system. It studied mainly kinetics of the planetary reducer of gear meshing force and speed, the planetary reducer of gear transmission uniform load, the planetary reducer of the second gear meshing contact stress under the environment of flexible body, vibration response of the reducer housing and reliability of the ring gear meshing contact force. According to the structure principle of excavators slewing system and in view of the existing rotary motor, this thesis analyzes the structural model of piston motor and hydraulic valves. It studies on the modeling and simulation through AMESim and excavators slewing system mechanical-hydraulic Co-simulation platform is built up in AMESim and researches the basic performance of the proposed model.This article gets the following several aspects of research results mainly.First, during the transmission of planetary gear and ring gear of the planetary reducer in mesh, meshing contact stress is associated with friction coefficient of the contact surface, as well as the lower coefficient of friction and the smaller contact stress. Contact stress on tooth width direction is linear distribution, and somethingoccurs on gear transmission end meshing situation due to the finite element model being simplified in the aspect of chamfering.Second, the result of vibration response based on the modal proves the range of vibration response frequency that there is certain overlaps with modes of the shell of vibration mode and natural frequency, when the meshing force is applied to the shell as dynamic incentive. Therefore, it will produce the phenomenon of forced vibration, here are some unreasonable phenomenon which should be avoided when designing planetary reducer as possible.Third, the 1D+3D mechanical-hydraulic Co-simulation analysis model of excavators slewing hydraulic system is built up in LMS Imagine.lab AMESim and LMS Virtual.lab Motion. This kind of research method provides a good simulation platform for the farther research of excavators slewing system, it also improves the accuracy of the simulation analysis results and this study laid a foundation for the development of the excavators system simulation platform of research.