基于自调的非同轴双输出脉动式无级变速器传动结构设计与分析
发布时间：2019-06-24 15:33
【摘要】：机械式脉动无级变速器具有变速范围宽、调速方式多、设计灵活度大、承载能力高和性能稳定等特点,在许多工业领域和加工生产线当中有着广泛的应用。目前,脉动式无级变速器大多是中低速、中小功率且存在一定速度波动的机型。为了降低输出转速的脉动度,一般是将三相以上的传动机构组合在一起使用,但是将多相传动机构组合起来使用不仅使变速器的结构变得更加复杂,而且还会引入过多的重复约束,导致传动机构对误差非常敏感。因此,研制大功率、低脉动、结构紧凑和无重复约束的新机型是脉动式无级变速器未来发展的重要方向,拥有广阔的发展前景。本文正是针对脉动式无级变速器的上述发展要求,在前人对非同轴双输出六杆函数发生机构型综合的基础上,以运动分析作为主要研究手段,对主传动机构进行尺度综合,并进行了结构化设计,目前正在试制样机。本文工作内容如下:(1)分析了双输出六杆机构的工作原理和传动特点,建立了四相四杆单输出机构的Simulink仿真模型,以便于分析摇杆输出角速度变化规律。并对两相双输出六杆机构的进行了运动学仿真,分析表明,摇杆DG正行程和摇杆EF反行程的角速度曲线的变化规律相差较大,从而导致输出转速的脉动度较大。在ADAMS中建立两相六杆传动机构的参数化模型,以减小脉动度为目标,对设计变量进行了优化,进而确定了各杆尺寸参数的最佳匹配值,提高了输出转速平稳性。(2)分析了该六杆传动机构中的存在过约束现象,运用零过约束杆组法进行了无过约束自调结构设计,得到了运动副的配置方案。利用矢量旋转法,建立运动副B中自调位移计算模型,得到运动副B中自调位移变化规律,并在运动副轴线误差的作用下,进行了仿真分析,结果表明误差对自调结构输出性能的影响几乎可以忽略。(3)设计了用于非同轴双输出脉动式无级变速器的斜面拉杆式曲柄调速装置,完成了变速器主要零部件的设计和整机装配模型的创建,并在ADAMS中进行了运动学和负载作用下的动力学仿真分析。(4)利用ANSYS Workbench对箱体、传动轴进行了动力学模态分析。对核心零件之一的连杆进行了强度分析,并对连杆的结构外形进行了拓扑结构优化。本文研究的非同轴双输出脉动式无级变速器具有结构简单紧凑,变速性能稳定等特点。经自调结构设计后,机构对误差具有较好的适应能力,同时对制造精度的要求较低,具有良好的经济效益。
[Abstract]:The mechanical pulsating continuously variable transmission has the characteristics of wide variable speed range, multi-speed regulation mode, large design flexibility, high bearing capacity and stable performance, and has wide application in many industrial fields and processing production lines. At present, most of the pulse-type continuously variable transmission is of low and medium-speed, medium and small power, and there is a certain speed fluctuation model. in order to reduce the pulsation of the output rotation speed, it is generally used to combine three or more transmission mechanisms, but the combination of the multi-phase transmission mechanism makes it possible not only to make the structure of the transmission more complex, but also to introduce excessive repetition constraints, Causing the transmission mechanism to be very sensitive to the error. Therefore, the development of high-power, low-pulse, compact and non-repetitive-constrained new type is the important direction of the future development of the pulse-type continuously variable transmission, and has a wide development prospect. In this paper, based on the above-mentioned development requirement of the pulse-type continuously variable transmission, on the basis of the former combination of non-coaxial double-output six-bar functions, the motion analysis is used as the main research means, and the main transmission mechanism is subjected to scale synthesis, and the structured design is carried out. The prototype is currently being developed. The working contents of the paper are as follows: (1) The working principle and transmission characteristics of the double-output six-bar mechanism are analyzed, and the Simulink simulation model of the four-phase four-bar single-output mechanism is established, so as to analyze the change law of the output angular velocity of the rocker. The kinematics simulation of the two-phase double-output six-bar mechanism is carried out. The results show that the variation law of the angular velocity curve of the forward stroke of the rocker arm and the reverse stroke of the rocker arm is relatively large, resulting in a large fluctuation of the output speed. The parametric model of two-phase six-rod transmission mechanism was established in ADAMS to reduce the pulsation degree, and the design variable was optimized, and the best matching value of each rod size parameter was determined, and the stability of the output speed was improved. (2) The existence of the constraint phenomenon in the six-rod transmission mechanism is analyzed, and the self-adjusting structure design of the non-constrained self-adjusting is carried out by using the zero-crossing restraint rod group method, and the configuration scheme of the motion pair is obtained. By using the vector rotation method, the self-adjusting displacement calculation model in the motion pair B is established, and the variation law of the self-adjusting displacement in the motion pair B is obtained, and the simulation analysis is carried out under the action of the motion sub-axis error, and the result shows that the influence of the error on the output performance of the self-adjusting structure is almost negligible. (3) The design of the main parts of the transmission and the creation of the assembly model of the whole machine are completed, and the dynamic simulation analysis under the action of kinematics and load is carried out in ADAMS. (4) The dynamic modal analysis of the box and the transmission shaft was carried out by using the ANSYS Workbench. The strength analysis of the connecting rod of one of the core parts is carried out, and the structural shape of the connecting rod is optimized. The non-coaxial double-output pulse type continuously variable transmission studied in this paper has the characteristics of simple and compact structure, stable variable-speed performance and the like. After the self-adjusting structure design, the mechanism has better adaptability to the error, and meanwhile, the requirement on the manufacturing precision is low, and the mechanism has good economic benefit.
【学位授予单位】：重庆理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH132.46
本文编号：2505174
[Abstract]:The mechanical pulsating continuously variable transmission has the characteristics of wide variable speed range, multi-speed regulation mode, large design flexibility, high bearing capacity and stable performance, and has wide application in many industrial fields and processing production lines. At present, most of the pulse-type continuously variable transmission is of low and medium-speed, medium and small power, and there is a certain speed fluctuation model. in order to reduce the pulsation of the output rotation speed, it is generally used to combine three or more transmission mechanisms, but the combination of the multi-phase transmission mechanism makes it possible not only to make the structure of the transmission more complex, but also to introduce excessive repetition constraints, Causing the transmission mechanism to be very sensitive to the error. Therefore, the development of high-power, low-pulse, compact and non-repetitive-constrained new type is the important direction of the future development of the pulse-type continuously variable transmission, and has a wide development prospect. In this paper, based on the above-mentioned development requirement of the pulse-type continuously variable transmission, on the basis of the former combination of non-coaxial double-output six-bar functions, the motion analysis is used as the main research means, and the main transmission mechanism is subjected to scale synthesis, and the structured design is carried out. The prototype is currently being developed. The working contents of the paper are as follows: (1) The working principle and transmission characteristics of the double-output six-bar mechanism are analyzed, and the Simulink simulation model of the four-phase four-bar single-output mechanism is established, so as to analyze the change law of the output angular velocity of the rocker. The kinematics simulation of the two-phase double-output six-bar mechanism is carried out. The results show that the variation law of the angular velocity curve of the forward stroke of the rocker arm and the reverse stroke of the rocker arm is relatively large, resulting in a large fluctuation of the output speed. The parametric model of two-phase six-rod transmission mechanism was established in ADAMS to reduce the pulsation degree, and the design variable was optimized, and the best matching value of each rod size parameter was determined, and the stability of the output speed was improved. (2) The existence of the constraint phenomenon in the six-rod transmission mechanism is analyzed, and the self-adjusting structure design of the non-constrained self-adjusting is carried out by using the zero-crossing restraint rod group method, and the configuration scheme of the motion pair is obtained. By using the vector rotation method, the self-adjusting displacement calculation model in the motion pair B is established, and the variation law of the self-adjusting displacement in the motion pair B is obtained, and the simulation analysis is carried out under the action of the motion sub-axis error, and the result shows that the influence of the error on the output performance of the self-adjusting structure is almost negligible. (3) The design of the main parts of the transmission and the creation of the assembly model of the whole machine are completed, and the dynamic simulation analysis under the action of kinematics and load is carried out in ADAMS. (4) The dynamic modal analysis of the box and the transmission shaft was carried out by using the ANSYS Workbench. The strength analysis of the connecting rod of one of the core parts is carried out, and the structural shape of the connecting rod is optimized. The non-coaxial double-output pulse type continuously variable transmission studied in this paper has the characteristics of simple and compact structure, stable variable-speed performance and the like. After the self-adjusting structure design, the mechanism has better adaptability to the error, and meanwhile, the requirement on the manufacturing precision is low, and the mechanism has good economic benefit.
【学位授予单位】：重庆理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH132.46
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相关期刊论文 前4条
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