| COMMON DEFINITION FOR END-SURFACE CONTACT RATIO OF GEARS AND ITS APPLICATIONS |
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| 作者姓名： | Tan Weiming |
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| 作者单位： | Tan WeimingDepartment of Mechanical Engineering，Foshan University，Foshan 528000，China |
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| 基金项目： | ThisprojectissupportedbyChinaScholarshipCouncil(No.96862011). |
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| 摘 要： | Common definition and calculating expressions of end-surface contact ratio for all type of gears are put forward, and with calculation expressions for involute gears, micro-segments profile gears, and sine-curved profile gears being discussed. The end-surface contact ratio of gears is defined as the ratio of the action angle (the rotation angle of gear from gear-in to gear-out for one pair of teeth) to the rotation angle per pitch (or central angle per tooth). According to the theory of gearing, equation of the meshing line can be deduced from the tooth profiles of basic rack. Having obtained the equation of the meshing line, and being given the addendum outline of the gears, the contact ratio can be calculated with the calculation expressions. For the involute gears, this definition has same effect as the well-known definition: ratio of the contact line to the base pitch. This definition of contact ratio is also suitable to other non-involute gears, such as micro-segments profile gears, sine-curved prof
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| 关 键 词： | 齿轮 操作角 螺距 旋转角 正弦曲线 |
COMMON DEFINITION FOR END-SURFACE CONTACT RATIO OF GEARS AND ITS APPLICATIONS |
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| Tan Weiming.COMMON DEFINITION FOR END-SURFACE CONTACT RATIO OF GEARS AND ITS APPLICATIONS[J].Chinese Journal of Mechanical Engineering,2004,17(4):595-597. |
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| Authors: | TanWeiming |
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| Affiliation: | DepartmentofMechanicalEngineering,FoshanUniversity,Foshan528000,China |
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| Abstract: | Common definition and calculating expressions of end-surface contact ratio for all type of gears are put forward, and with calculation expressions for involute gears, micro-segments profile gears, and sine-curved profile gears being discussed. The end-surface contact ratio of gears is defined as the ratio of the action angle (the rotation angle of gear from gear-in to gear-out for one pair of teeth) to the rotation angle per pitch (or central angle per tooth). According to the theory of gearing, equation of the meshing line can be deduced from the tooth profiles of basic rack. Having obtained the equation of the meshing line, and being given the addendum outline of the gears, the contact ratio can be calculated with the calculation expressions. For the involute gears, this definition has same effect as the well-known definition: ratio of the contact line to the base pitch. This definition of contact ratio is also suitable to other non-involute gears, such as micro-segments profile gears, sine-curved profile gears, and can give more reliable results. |
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| Keywords: | Gears Contact ratio Action angle Rotation angle per pitch Micro-segments gears Sine-curved profile gears |
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