新齿廓人字齿同步带及其传动性能研究

发布时间：2018-03-11 07:00

  本文选题：齿廓　切入点：人字齿同步带　出处：《哈尔滨工业大学》2014年博士论文　论文类型：学位论文

【摘要】：针对特殊传动领域对同步带传动寿命、精度和噪声所提出的限制要求,已经成为制约同步带应用和发展的瓶颈问题。人字齿同步带是继直齿和斜齿同步带传动之后,带传动领域新的热点研究课题。人字型排列的带齿,不同于直齿啮合传动机理,是解决制约同步带传动技术瓶颈问题的突破技术和手段。针对同步带与带轮在完全、不完全啮合区存在不同的啮合性能特点,研究拟在提高传动系统性能、协应两种啮合性能的带与轮齿齿形。在此基础上,以现有的研究成果为基础,借助等共轭曲率高阶切触阶啮合理论,推导出了具有传动侧隙小、齿形协同关系友好、齿面接触强度高,接触点邻域间隙3阶无穷小的圆弧齿形作为人字齿同步带传动的法面齿廓模型。利用弹性力学复变函数映射法,建立了法面齿形参数、载荷同带齿应力关系的计算模型,研究了齿形参数对带齿应力的影响,揭示了各参数之间的耦合关系及变化规律,确定了影响带齿应力变化规律的主要参数。建立了带齿与轮齿刚柔耦合接触非线性三维有限元分析模型,研究了螺旋角、侧隙、带轮结构对带齿、强力层的应力和变形影响规律,确定了重要的影响参数。建立了新齿廓人字齿同步带在完全和不完全啮合区啮合传动三维数学仿真模型,研究了齿形、节距差、螺旋角等参数对啮合传动干涉影响,揭示了齿廓干涉形貌与各参数关系,优选了传动结构及齿形参数。开展了新齿廓人字齿同步带、带轮关键制造技术研究。针对模具、带轮新齿形曲面的性能,建立了带轮刀具-带轮和带齿-刀具-模具二次包络的设计体系,研究了曲面包络过程中啮合界限线、根切界限线、瞬时接触线、二次接触、包络齿廓曲面形成等特点,揭示了切削中产生振动的原因并提供了消除振动方法,制备了带轮和样带。开展了新齿廓人字齿同步带与同端面齿形的直齿同步带的传动误差、噪声、带齿疲劳磨损性能对比研究。建立了基于直齿同步带多边形效应的几何关系传动模型,研究了多边形效应对传动系统啮入、啮出端速度波动误差的影响。建立了新齿廓人字齿同步带具有爬齿特征的动态传动误差模型,研究了带宽、螺旋角、带轮齿数对传动误差的影响,揭示了人字齿传动精度高的机理,螺旋率是降低传动误差关键参数,螺旋率等于整数时传动误差最小。通过对台架噪声、疲劳磨损实验的数据采集、分析对比,人字齿比直齿同步带传动更平稳,传动噪声更低(在共振条件下最大降噪11d B),噪声实验数据与国外的斜齿和人字齿同步带作了对比,降噪效果略优。光学显微镜对进行了263h的人字齿、233h的直齿同步带疲劳磨损后齿面观测,人字齿齿面磨损更轻,磨损位置与磨损程度与啮合干涉磨损理论研究结果一致,表明新齿廓人字齿同步带比直齿具有更高的带齿强度。
[Abstract]:Aiming at the limitation of the life, precision and noise of the synchronous belt transmission in the special transmission field, it has become a bottleneck problem that restricts the application and development of the synchronous belt. Different from the mechanism of straight tooth meshing transmission, it is a breakthrough technology and means to solve the bottleneck problem of synchronous belt transmission technology. There are different characteristics of meshing performance in incomplete meshing region. In order to improve the performance of transmission system, two kinds of gear tooth shapes with and without meshing performance are studied. On this basis, based on the existing research results, With the aid of the contact order meshing theory of high order contact with equal conjugate curvature, it is deduced that the contact strength of tooth surface is high, with small transmission clearance, friendly cooperative relationship of tooth shape, and high contact strength of tooth surface. The third order infinitesimal arc tooth profile of the contact point is used as the normal tooth profile model of the synchronous belt drive of the herringbone tooth. By using the mapping method of the elastic mechanics complex variable function, the calculation model of the normal tooth profile parameters and the relationship between the load and the stress of the belt tooth is established. The influence of tooth shape parameters on the stress of the belt tooth is studied, and the coupling relation and variation law among the parameters are revealed. The main parameters influencing the stress variation of belt teeth are determined. The nonlinear finite element analysis model of coupling contact between belt teeth and gear teeth is established, and the helical angle, side gap and belt gear structure are studied. The influence law of stress and deformation of the strength layer is determined and the important influence parameters are determined. The three-dimensional mathematical simulation model of the meshing transmission of the new tooth profile in the complete and incomplete meshing region is established, and the tooth profile and pitch difference are studied. The influence of helical angle and other parameters on the interference of meshing transmission is revealed. The relationship between the profile of tooth interference and the parameters is revealed. The transmission structure and tooth shape parameters are optimized. The research on the synchronous belt of the new tooth profile and the key manufacturing technology of the belt wheel is carried out. The design system of the quadratic envelope of the tool with wheel and the tool with tooth and die is established. The meshing boundary line, the root tangent limit line, the instantaneous contact line and the secondary contact in the process of surface envelope are studied. In this paper, the causes of vibration in cutting are revealed, the method of eliminating vibration is provided, and the belt and sample belt are prepared. The transmission errors of the synchronous belt with the new tooth profile and the straight synchronous belt with the same end tooth profile are carried out. A geometric relation transmission model based on polygon effect of straight tooth synchronous belt is established, and the effect of polygon effect on transmission system is studied. The influence of velocity fluctuation error at the end of a new tooth profile on the dynamic transmission error of the herringbone synchronous belt with climbing teeth is established. The influence of bandwidth, spiral angle and the number of teeth on the transmission error is studied. The mechanism of high precision of herringbone drive is revealed. Helix rate is the key parameter to reduce transmission error, and the transmission error is the least when the helix ratio is equal to integer. The data collection of bench noise and fatigue wear experiment is analyzed and compared. The herringbone tooth is more stable than the straight tooth synchronous belt drive, and the transmission noise is lower. The noise experimental data are compared with the oblique teeth and the herringbone synchronous belt under the condition of resonance. The effect of noise reduction is slightly better. The tooth surface of the straight synchronous belt with 263 h of miter tooth has been observed by optical microscope after fatigue wear, and the wear position and degree of wear are consistent with the results of the theory of meshing interference wear, the wear position and the degree of wear are consistent with the theoretical results of meshing interference wear. The results show that the new tooth profile has higher belt strength than the straight tooth.
【学位授予单位】：哈尔滨工业大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TH132.32
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本文编号：1597066