Analysis Of Compound Transmission Efficiency And Contact Characteristics Of Helical Curve-Face Gear

Helical curve-face gear pair compound transmission mechanism is in comprehensive face CAM,curve-face gear and helical gear is proposed on the basis of the advantages of a new type of composite transmission mechanism,the agency by the helical curve-face gear and helical cylindrical gear mesh each other in a vertical plane,the output shaft up straight line reciprocating movement,the cut up output variable transmission ratio of the rotary motion,achieved in the intersection between shaft transmission speed and power.Compared with the traditional compound motion mechanism,this mechanism has the advantages of accurate transmission,space saving,simplified mechanism and not easy to wear,etc.,which has rich potential value in civil and defense fields such as agricultural engineering and aerospace engineering.Therefore,it is of great significance to study the law of this type of compound transmission mechanism.The project derives from the National Natural Science Found of China "Design theory and experimental study of intersecting axial variable transmission ratio compound transmission gear pair"(Project NO.51675060).In this paper,the helical curve-face gear pair with compound moving is creatively put forward.The main research direction is to study the compound motion principle,axial motion characteristics,tooth surface stress changes,transmission efficiency,tooth surface contact characteristics and experimental methods of the helical tooth end curved gear.The main contents of this paper are as follows:Using the principle of mechanism,the meshing principle of the compound transmission mechanism of the helical curve-face gear pair is discussed,set up a simple composite transmission model,analyzes the composite transmission principle,the application of the gear tooth surface meshing principle and envelope principle of helical curve-face gear pitch curve equation was deduced and tooth surface equation,established the composite movement gears surface pressure Angle and the transverse pressure Angle and the relationship between the helical curve-face gear speed.Use of the space coordinate transformation principle and calculus,helical curve-face gear pair is established the mathematical model of axial displacement,speed and transmission ratio,The change rule of the axial force,normal force,radial force and spring force received by the helical curve-face gear is analyzed,and the speed characteristics and force characteristics of the gear pair are combined to generate the equation of the compound transmission efficiency,the order number of oblique gear tooth surface gear and load influence on transmission efficiency,and compare the differences of spur/helical transmission efficiency.Using point contact theory,the deformation of the tooth contact line and the tooth surface of the contact point during the meshing process of the helical curve-face gear is analyzed.Based on the Hertz theory,the maximum contact stress equation of the contact point is derived,and the variation of the bearing capacity is analyzed.Find the dangerous gear,analyze the change rule of the maximum contact stress on the tooth surface of the dangerous gear,explore the influence of the normal surface modulus and load of the helical curve-face gear on the maximum contact stress,compare the The maximum contact stress of gear teeth between the dangerous gear of spur and helical gear pair.Use the three-dimensional model of the helical-end curved gear pair to generate a solid model in the five-axis CNC machining center,analyze the compound motion law of the helical curve-face gear,design the compound transmission test platform,the laser displacement sensor and torque sensor are used to measure and process the axial displacement,speed,transmission ratio,torque and transmission efficiency of the spur /helical curve-face gear,through the measured torque data,the maximum contact stress of the dangerous gear tooth is obtained.The experimental data is compared with the theoretical value and finite element analysis to prove the relevant inference.Combining the helical curve-face gear roll test and observing the tooth surface microtopography,the verification correctness of tooth surface contact characteristics.According to its application in actual production,the working pressure of the new gear plunger pump is analyzed.