新型高速滚子链链轮齿形研究

发布时间：2018-01-16 11:37

本文关键词：新型高速滚子链链轮齿形研究　出处：《山东大学》2011年硕士论文　论文类型：学位论文

【摘要】：滚子链是一种重要的机械基础件,广泛应用于汽车发动机、石油化工、自动流水线等机械上,特别是在重载、大中心距工况下,已成为众多行业首选的传动形式之一。然而,随着传动速度的不断提高,传统的滚子链链轮齿形难以适应于高速、低噪声等条件下的传动,由于缺乏必要的理论支持和技术支撑,目前国内对各种新型链轮齿形的研究尚处于起步阶段,一直依赖国外高价进口链。因此,急需研究新型链轮来提高滚子链机构的传动性能。首先,本文分析了链传动的多边形效应和啮合冲击的形成机理。以降低链条的波动量,减小链传动机构在高速运转时链条与链轮的啮合冲击,提高链传动的平稳性为目标,开展了新型齿廓链轮的设计研究。由于短幅外摆线无奇异点、与基圆并无交点且过渡光滑,因此选用短幅外摆线作为新型链轮的齿形。其次,根据短幅外摆线的形成机理,推导出短幅外摆线的方程,并利用参数方程求等距曲线的方法,得到了短幅外摆线链轮齿廓方程。通过三维建模技术,建立了短幅外摆线链轮、渐开线链轮、外摆线链轮以及两种标准链轮(DIN8196和GB1244-85)的三维模型,并利用MATLAB计算出各链轮齿形的数据。最后,利用多体动力学仿真软件,根据实际工况条件,建立了正时链传动机构多体动力学模型,进行动态仿真实验,并将结果进行对比分析。将MATLAB计算的各齿型数据(渐开线齿形、短幅外摆线齿形、外摆线齿形和标准齿形)输入到模型中,在1000-8000r/min不同转速下对几种齿形进行仿真实验。对比分析了渐开线链轮、短幅外摆线链轮、外摆线链轮和标准链轮在不同转速下的链条波动量、链条与传动部件间摩擦力、链条张力、链轮与滚子的啮合冲击以及从动轮的转速不均匀系数等。仿真结果表明,相对于渐开线链轮和外摆线链轮,短幅外摆线链轮能够降低链轮角速度波动、链条张力峰值以及链条与传动部件之间的摩擦力峰值；相对于标准链轮,短幅外摆线链轮在各种转速下都拥有较为优越的性能,能够有效提高链传动的平稳性和动态性能。
[Abstract]:Roller chain is an important mechanical base, which is widely used in automobile engine, petrochemical, automatic assembly line and other machinery, especially in heavy load, large center distance working conditions. It has become one of the preferred transmission forms in many industries. However, with the continuous improvement of transmission speed, the traditional roller chain sprocket tooth profile is difficult to adapt to high-speed, low-noise and other conditions of transmission. Due to the lack of necessary theoretical and technical support, the domestic research on various new sprocket tooth profile is still in its infancy and has been dependent on foreign high-priced import chain. It is urgent to study new type sprocket to improve the transmission performance of roller chain mechanism. Firstly, the polygon effect of chain transmission and the formation mechanism of meshing impact are analyzed in order to reduce the fluctuation of chain and reduce the meshing impact between chain and sprocket when the chain is running at high speed. In order to improve the stability of the chain drive, the design of the new gear profile sprocket is carried out. Because there is no singularity of the cycloid with short amplitude, there is no intersection point with the base circle and the transition is smooth. Therefore, a short epicycloid is chosen as the gear profile of a new type of sprocket. Secondly, according to the formation mechanism of short-amplitude epicycloid, the equation of short-amplitude epicycloid is deduced, and the tooth profile equation of short-amplitude epicycloid sprocket is obtained by using parameter equation. The 3D models of short epicycloid sprocket involute sprocket epicycloid sprocket and two standard sprockets named DIN8196 and GB1244-85are established. The tooth profile of each sprocket is calculated by MATLAB. Finally, using the multi-body dynamics simulation software, according to the actual working conditions, the multi-body dynamics model of timing chain drive mechanism is established, and the dynamic simulation experiment is carried out. The data of tooth profile (involute tooth profile, short amplitude epicycloid tooth profile, epicycloid tooth profile and standard tooth profile) calculated by MATLAB are input into the model. Several tooth shapes were simulated at different rotational speeds of 1000-8000rpm. The involute sprocket and short epicycloid sprocket were compared and analyzed. Chain fluctuation, friction between chain and transmission parts, chain tension at different speeds of cycloid sprocket and standard sprocket. The simulation results show that compared with involute sprocket and epicycloid sprocket, short epicycloid sprocket can reduce the angular velocity fluctuation of sprocket. The peak of chain tension and the peak of friction between chain and transmission parts; Compared with the standard sprocket, the short-amplitude epicycloid sprocket has superior performance at various rotational speeds, which can effectively improve the stability and dynamic performance of the chain drive.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH132.45

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