单向离合器接合过程对变速器换挡特性的影响

运用牛顿力学方法分阶段建立变速器的动力学模型,运用显式动力有限元方法获得单向离合器接合产生的冲击激励.将单向离合器接合产生的激励和传动系输入扭矩的激励叠加,计算了变速器输出端的扭矩、转速响应,并与实测值进行对比.试验结果显示,计算值与实测值吻合较好,说明本文提出的动态接合特性仿真方法对于可控式单向离合器的新型变速器换挡特性研究具有良好的分析效果,相关测试及计算方法对由单向离合器与齿轮副形成的传动系统的设计具有参考价值.

Impact of Engagement of One-way Clutch on Shift Characteristics of Transmission

This paper discussed the nonlinear torque of the engagement of selectable one-way clutch, which causes shift impact in the transmission. Firstly, dynamic models including steady states and transient state were built on the basis of the second Newton''s law. Secondly, the nonlinear torque of the engagement of the one-way clutch was calculated by explicit FEM method. Thirdly, the torque of the output shaft and rotational velocities of both the input and the output shaft were calculated under the excitation of the torque of the input shaft and impact generated by the quick engagement of the one-way clutch, which was obtained by explicit FEM method. Finally, tests on the engagement of the one-way clutch during shifts were carried out. The test results have shown that the torque peaks and the vibration frequencies on the output shaft are similar in different situations when the speed of input shaft is different. The simulation results are similar to the test results. This proves the method proposed is appropriate in the research of the dynamic characters of the transmission shifting by one-way clutches.