RV减速器摆线针齿传动机构线外啮入冲击研究

Study on Off-Line Meshing-in Impact Characteristics of Cycloid-PinGear Drive Mechanism of RV Reducer

针对摆线针齿传动机构啮合间隙引起的线外啮入冲击,进而导致RV减速器传动误差突变和振动冲击增大的问题,基于H-C(享特-克罗斯利)接触碰撞模型和Hertz(赫兹)接触碰撞变形规律,提出考虑摆线轮齿廓修形参数和机构设计参数的线外啮入冲击力模型与分析方法。首先,基于线外啮入冲击产生机理,确定了理论啮入点与实际啮入点,明确了弹性扭转角的计算方法。其次,基于H-C接触碰撞模型与Hertz接触碰撞变形规律,提出了考虑阻尼力的摆线针齿传动线外啮入冲击力模型。然后,采用多变量拟合方法,构建了摆线轮移距修形和偏心距与啮入冲击力的映射关系,揭示了摆线针齿传动机构线外啮入冲击的影响机制。最后,应用Ansys瞬态动力学模块进行摆线针齿传动机构碰撞动态力的仿真计算。结果表明:啮入冲击力随负移距修形量的减小而增加,随正移距修形量的增大而增加,随偏心距的减小而增加;理论和仿真得到的最大冲击力误差为7.98%,尚在允许范围内,验证了线外啮入冲击模型的可行性。该研究结果可为RV减速机摆线针齿传动机构的设计与优化提供理论依据。

Based on the H-C contact collision model and the Hertz contact collision deformation law,the meshing-in impact force model and analysis method considering cycloid gear tooth profile modification parameters and mechanism design parameters was proposed in the paper with a view to solving the problems such as sudden change of transmission error and increased vibration impact in RV reducers caused by off-line meshing-in impact due to the existence of clearance in the cycloid-pin gear drive mechanism.Firstly,based on the mechanism of how off-line meshing-in impact happened,the theoretical meshing-in point and the actual meshing-in point were determined and the calculation method of elastic torsion angle was clarified.Secondly,based on the H-C contact collision model and the Hertz contact collision deformation law,the meshing-in impact force model of the cycloid-pin gear drive mechanism considering damping force was proposed.Then,by using the multivariate fitting method,the mapping relationship between the design parameters such as cycloid gear radial-moving modification and eccentricity and the meshing-in impact force was constructed,and the influence mechanism of the off-line meshing-in impact characteristics of the cycloid-pin gear drive mechanism was revealed.Finally,the Ansys transient dynamics module was used to simulate the collision dynamic force of the cycloid-pin gear drive mechanism.The results show that the meshing-in impact force increases with the decrease of the negative radial-moving modification amount,the increase of the positive radial-moving modification amount and the decrease of the eccentricity;the maximum impact force error between theory and simulation result is 7.98%,which is in the allowable range and proves the feasibility of the off-line meshing-in impact model.The research results can provide a theoretical basis for the design and optimization of the cycloid-pin gear drive mechanism of RV reducers.