| The hydraulic clutch has been widely used in machine tools,hoisting and transporting machinery,ships and impact test rigs due to its high transmission torque,smooth joint,compact structure,frequent clutching and long-distance operation.The arrangement of the hydraulic cylinders in the hydraulic clutch has two types of rotary type and fixed type,and the geometric axis of the hydraulic cylinder coincides with the rotation axis of the main follower.When the transmission shaft diameter of the main follower is large,the working area of the hydraulic cylinder increases due to structural reasons.In order to meet the required clutch force,the working pressure of the hydraulic cylinder is usually low,generally not exceeding 3 MPa.Due to the low working pressure,when a hydraulic system experiences a pressure shock,a safety accident such as a false disconnection may occur.In this paper,a new type of tooth hydraulic clutch is designed for the structure and working conditions of the pendulum impact test rig of CSIC No.722.The clutch adopts a distributed fixed plunger cylinder structure,which can effectively reduce the working area of the plunger cylinder;its working pressure is up to 10 MPa,and is compatible with the set pressure of the hydraulic system;and has a smooth clutch,compact structure,and moment of inertia,small and safe and reliable.On this basis,a prototype of a dental hydraulic clutch was developed and tested on a pendulum impact test bench.The main research contents of this paper are as follows.1)According to the structural characteristics,working condition requirements and input parameters of the pendulum impact test rig,a new type of tooth hydraulic clutch is designed.On this basis,the calculation and strength check of the main components such as the output torque of the hydraulic clutch,the face gear,the plunger cylinder,the input and output shaft and the joint spring are obtained,so that the reasonable hydraulic clutch structural parameters are obtained.2)Using the plunger transient equation of motion as the fluid moving boundary,the boundary flow field model of the jaw clutch hydraulic cylinder is established.The dynamic mesh technique of Fluent software is used to simulate the flow field of the flow channel in the distributed plunger cylinder.Study the pressure cloud diagram,streamline diagram and plunger motion curve of the flow field in the plunger cylinder are obtained,and the flow characteristics of the fluid in the plunger cylinder are analyzed.Then,the diameter of the connecting passage in the plunger cylinder is analyzed.The influence of cylinder synchronism provides a theoretical basis for the structural design and analysis of the clutch.3)Using ANSYS/LS-DYNA dynamics software to simulate the impact of the tooth engagement process of the jaw clutch hydraulic clutch,and obtain the dynamic stress distribution and deformation state of the face tooth during the meshing process;in LS-DYNA By changing the parameters such as the joint speed,the speed difference and the load of the face teeth,the influence of the above parameters on the impact stress of the face tooth is studied by using the control variable method,so as to avoid the irreversible deformation of the face gear of the jaw clutch in the repeated engagement process.Deformation provides the basis for design.4)Adams analysis software was used to simulated the hydraulic clutch;and the hydraulic clutch test and research have been completed to verify the rationality and reliability of hydraulic clutch design. |
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