活塞发动机止动轮毂传动系统动态特性分析

为揭示活塞发动机止动轮毂传动系统振动机理，在分析发动机止动轮毂系统工作原理的基础上，分别采用能量法与Adams多体动力学软件，建立了止动轮毂传动系统动力学模型，提出了止动轮毂三爪曲面接触系统动力学建模与分析方法。通过对比分析两种模型在额定工况下轴向力响应结果，相互验证了动力学仿真模型的正确性。为减轻止动轮毂系统振动冲击，研究了不同扭矩和轴向预紧力工况对止动轮毂系统轴向冲击力与位移的影响规律。结果表明：不同工况参数下的系统动态响应特性差异明显；随着扭矩由350 N·m增大到500 N·m，系统轴向冲击力增大，轴向位移增大近一倍；随着轴向预紧力由6 000 N逐步增大到8 000 N，系统轴向冲击力峰值逐渐增大，稳定后均值变化较小，轴向位移则随之减小。在额定扭矩工况下，取适当小的轴向预紧力，有利于减小止动轮毂系统所受的轴向冲击力，改善系统振动冲击。

Analysis for dynamic characteristics of the doghub transmission system used in piston engine

In order to reveal the vibration mechanism of the engine doghub transmission system, based on the analysis of the working principle of the engine doghub system, the dynamic models of the engine doghub transmission system were established with the energy method and the Adams software. The dynamic modeling and analysis methods were proposed for three-jaw curved contact system of the doghub. By comparing the axial force response results of the two models under rated working condition, the correctness of the dynamic models was verified. To reduce the vibration and impact of the doghub transmission system, the influences of different torques and axial preloads on the axial impact force and displacement of the doghub system were studied. Results show that the dynamic response characteristics of the system under different operating conditions were significantly different. As the torque increased from 350 N·m to 500 N·m, the axial impact force of the system increased, and the axial displacement nearly doubled. As the axial preload gradually increased from 6 000 N to 8 000 N, the peak value of the system axial impact force increased, and the mean value changed slightly after stabilization, and the axial displacement decreased accordingly, suggesting that under the condition of rated torque, an appropriate small axial preload is beneficial to reducing the axial impact force on the doghub transmission system and relieving the vibration and impact of the system.