Research On Axial Force Of High Speed Ratio Adjustable Hydraulic Torque Converter

Hydraulic speed control planetary gear is a high-efficiency hydraulic speed transmission device.The device combines hydraulic drive elements and mechanical drive elements together to be used in specific transmission and speed regulation occasions.The guide vane adjustable hydraulic torque converter plays the role of speed regulation and is the core component of the device.In the course of operation,the working wheel components of the hydraulic torque converter will generate a large axial force due to the difference in the pressure area between the front and back cover of the impeller and the pressure distribution of the pressure distribution.The axial force factor needs to be taken into account in the design of hydraulic torque converter,so as to select suitable bearings.At present,there are few studies on axial force of hydraulic torque converter with adjustable guide blade in China.Based on the model LB46 guide vane adjustable hydraulic torque converter as the research object,using numerical simulation method for the axial force of the research,the change rule of the axial force is obtained,and studies the balance method of turboshaft to force for hydraulic torque converter design support program for calculating the axial force is to provide the reference method.The change of axial force with rotating speed ratio of guide vane adjustable hydraulic torque converter is studied in this paper.Firstly,the causes and research methods of the axial force of the torque converter are introduced,and the internal flow passage and clearance of the torque converter are numerically calculated to obtain the axial force variation rule.Taking the direction of pump wheel rotation angular velocity as the positive direction,the axial force of pump wheel changes from-4248 n to 2808 N with the increase of rotating speed ratio.The rotation occurs at the point of rotating speed ratio 0.7.The axial force of the vortex wheel decreases with the increase of rotating speed ratio.The direction is always positive,and its maximum value is 21863 N.In this paper,the influence of oil supply pressure change on axial force is studied.The oil supply pressure is set to 0.5mpa,0.6mpa and 0.7mpa for numerical simulation while other conditions remain unchanged.It is found that the axial force of the working wheel under the same rotating speed ratio increases with the increase of oil supply pressure,which increases the rotation vector force of a pump wheel.The axial force of oil supply pressure is 0.7Mpa,the maximum axial force of pump wheel is 4838 N,and the maximum axial force of vortex wheel is 26682 N.In this paper,the influence of guide vanes opening degree on axial force is studied,and the guide vanes opening degree is reduced to 67%,49% and 31% respectively under other conditions.It was found that the smaller the guide vane opening,the greater the axial force between the pump wheel and the turbine.The maximum value of pump wheel reached 9107 N at 31% opening degree,while the axial force variation of vortex wheel was relatively small.This paper studies the balance method of turboshaft to force on the turbine disk drive after unloading hole are simulated,after opening unloading hole found on both sides of the turbine clearance narrowing of the axial pressure,cause the turboshaft to force decreases,and the pump shaft force increases,the turbine shaft to reduce the maximum force 11573 N.The influence of the size and position of the unloading hole on the axial force balance was studied.It is found that the larger the unloading hole area and the closer the position is to the clearance inlet,the better the axial force balance effect is.