| XU Cai-hong,WANG You-qiang,ZHANG Tong-gang,WANG Li-mei.Lubrication Analysis of Commutation Position of Reciprocating Gear Rack[J],47(1):78-84 |
| Lubrication Analysis of Commutation Position of Reciprocating Gear Rack |
| Received:June 12, 2017 Revised:January 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.01.013 |
| KeyWord:reciprocating motion gear rack EHL commutation position thermal effect |
| 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 |
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| Abstract: |
| The work aims to obtain lubrication condition of reciprocating gear rack mechanism in different position along line of action during commutation processby calculating pressure, film thickness and temperature of the mechanism in different commutation position in a mesh cycle, so as to provide theoretical basis for lubrication design of reciprocating gear rack mechanism. Transmission model of the gear rack was simplified to motion between cylinder and infinite plane, a thermal elastohydrodynamic lubrication model was established for reciprocating gear rack transmission. The pressure was solved in multi-grid method, and elastic deformation in multiple-grid integration method, then centeral pressure and film thickness, minimum film thickness and maximum temperature of the reciprocating gear rack in one mesh cycle in different commutation position were calculated and compared with existing experimental results. Film thickness of the reversing point was still the lowest in the whole commutation process regardless of the area in the line of action. Initial deceleration of the commutation process didn't lead to direct reduction of oil film pressure, but the pressure first increased and then decreased instead, and fluctuated as well. The closer the commutation position of the gear rack was to engaging-out point, the thicker the film was. The reciprocating commutation motion leads to worse lubrication state, and commutation point is still a dangerous point in the lubrication process of reciprocating gear rack. The closer the position is to the engaging-out point, the thicker the film is, but the whole commutation process must occur in the double teeth meshing area after the single tooth meshing. |
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