| XU Cai-hong,WANG You-qiang,ZHANG Tong-gang,WANG Li-mei.Influence of Load Time-varying on Elastohydrodynamic Lubrication of Gear Rack[J],46(6):77-83 |
| Influence of Load Time-varying on Elastohydrodynamic Lubrication of Gear Rack |
| Received:October 23, 2016 Revised:June 20, 2017 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2017.06.012 |
| KeyWord:gear rack transient EHL pressure film thickness single and double teeth meshing |
| Author | Institution |
| XU Cai-hong |
School of Mechanical Engineering, Qingdao University of Technology, Qingdao , China |
| WANG You-qiang |
School of Mechanical Engineering, Qingdao University of Technology, Qingdao , China |
| ZHANG Tong-gang |
School of Mechanical Engineering, Qingdao University of Technology, Qingdao , China |
| WANG Li-mei |
School of Mechanical Engineering, Qingdao University of Technology, Qingdao , China |
|
| Hits: |
| Download times: |
| Abstract: |
| The work aims to improve lubrication performance of gear rack mechanism and reduce wear during transmission process of gear rack by calculating pressure and film thickness during transmission process. Load map of gear rack transmission process was simplified, a simplified actual load curve was used, and a calculation model of elastohydrodynamic lubrication was built for gear-rack meshing process, so as to study transient elastohydrodynamic lubrication during gear-rack meshing process. Different load between single and double teeth during meshing process was considered to calculate central pressure, central film thickness, maximum pressure and minimum film thickness along meshing line in a meshing cycle, pressure and film thickness at the engaging-in point, node, engaging-out point, transient pressure and film thickness when double teeth meshing zone converted to a single tooth meshing zone, and single tooth meshing zone converted to a double teeth meshing zone. Multi-grid method was applied to calculate the pressure, multi-grid integration method was applied to calculate elastic deformation, complete numerical solutions were obtained for the transient elastohydrodynamic lubrication of gear-rack transmission mechanism. Sudden increase in central pressure was caused by sudden increase in the load, the maximum values of the central film thickness were present at the critical point between the double teeth meshing zone and the single tooth meshing. The minimum film thickness and maximum pressure fluctuated on the meshing line; transient film thickness was the thinnest and lubrication condition was poor during engaging-in. The pressure and film thickness along the meshing line change constantly; sudden change in pressure caused by that in load by improving strength of gear teeth to prevent occurrence of surface fatigue damage. Throughout the meshing process, the engaging-in point is a dangerous point. |
| Close |
|
|
|