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《机械传动》2016,(11):117-122
为了研究安装误差、支撑变形对面齿轮功率分支传动系统转矩分配的影响,提出了面齿轮功率分支传动系统的转矩分配计算方法。首先通过转矩平衡方程和变形协调条件建立了面齿轮功率分支传动系统的转矩分配模型,变形协调条件与齿轮副的时变啮合刚度直接关联;其次对面齿轮传动进行了受力分析,由此阐述了支撑系统的变形,并将支撑变形转化为齿轮的安装误差;再次通过齿面接触分析和轮齿承载接触分析,将齿轮副的啮合刚度拟合为载荷的函数;最后提出了系统均载系数的计算方法。数字计算实例表明,在安装误差和支撑变形的综合作用下,系统两个分支的均载系数分别为0.55和1.45,当小齿轮径向支撑变形(a_(x1))取-692.3μm时,两个分支的均载系数为0.987 0、1.013。因此小齿轮径向支撑变形(a_(x1))可以在一定程度上抵消安装误差、支撑变形对转矩分配不均等的影响。 相似文献
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以提高分扭传动系统的均载性能为目的,采用动力学分析方法研究系统的均载特性。建立了齿轮副特征矩阵和齿轮间耦合刚度矩阵,通过矩阵拼装得到了分扭传动系统的动力学方程。定义了系统均载系数,计算得到直齿轮和人字齿轮的啮合刚度,给出了由于安装误差造成的齿轮啮合时的误差表达式。研究得出:各构件单独存在安装误差时,不同构件对系统均载系数影响不同;各构件同时存在安装误差时,构件间对系统均载系数的影响可能被抵消;两级传动间连接的扭转刚度对系统均载系数影响较大。结果表明,可以通过调节某一构件的安装误差或减小两级传动间连接的扭转刚度提高系统的均载性能。 相似文献
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《机械传动》2016,(8):43-49
针对双输入圆柱齿轮动力分流传动系统,建立了传动系统的静力学分析模型,模型中考虑了齿轮副的啮合变形、齿轮中心的横向变形、双联齿轮轴的扭转变形、齿轮安装误差和支撑刚度等因素。根据传动系统的力矩和力平衡条件,以及其闭环结构的变形协调条件,建立了系统的静力学平衡方程,求解了系统各分支双联齿轮轴的转矩及各分支均载系数,获得了安装误差、安装角、双联齿轮轴扭转刚度对系统均载系数的影响规律。研究结果表明,误差具有累加作用,各误差综合作用时系统均载系数显著增大,并车级齿轮安装误差对系统均载性能的影响大于分扭级;在该组参数条件下,两输入安装角为166°左右时,系统左右输入均载系数相等;降低双联齿轮轴扭转刚度有助于提高系统均载性能,合理配置分扭级安装角和双联齿轮轴扭转刚度差值有利于进一步改善均载性能。 相似文献
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安装误差对封闭差动人字齿轮传动系统动态均载特性的影响 总被引:4,自引:1,他引:4
通过坐标变换推导出封闭差动人字齿轮传动系统各齿轮安装误差沿啮合线等效位移公式;基于集中参数理论,建立采用中间浮动构件的该型传动动力学模型;通过计算系统两级内外啮合均载系数,获得各齿轮安装误差与系统两级内外啮合均载系数关系曲线,进而分析齿轮安装误差对系统均载特性的影响。研究结果表明:在齿轮安装误差作用下,差动级均载系数大于封闭级;差动级内/外啮合均载系数随差动级内齿轮/太阳轮安装误差增加而增大,差动级内齿轮/太阳轮安装误差对差动级外/内啮合均载系数影响很小;封闭级均载系数随封闭级内齿轮安装误差增加而增大,封闭级太阳轮安装误差对封闭级均载系数影响很小;行星轮/星轮安装误差对差动级/封闭级均载系数影响很小;差动级均载系数对差动级中心轮安装误差位置角不敏感,封闭级中心轮安装误差位置角对封闭级均载系数影响较大。 相似文献
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为了改善直齿锥齿轮分支传动系统性能,提出基于啮合特性的静态均载分析方法。通过建立考虑中心轮安装误差的单级分支系统多体齿轮齿面接触分析(MTCA)方法,获得各齿轮副初始接触间隙;计及该间隙引起的啮合偏差,采用集中参数法主要考虑中心轮的浮动特性,建立考虑其支撑变形、各齿轮扭转变形相互耦合的静力学平衡方程,获得各分支均载系数,分析了载荷、安装误差、支撑刚度等对系统均载系数的影响。结果表明,随支撑刚度、安装误差的增大,均载系数逐渐增大,轴向对正误差和偏置对正误差对均载系数的影响是等效的;随转矩的增加,均载系数逐渐减小;各分支齿轮副的几何传动误差大小反映了均载系数变化规律,即齿面初始间隙越大,承担的载荷越小。研究结果为高精度直齿锥齿轮分支系统的均载分析提供了理论参考。 相似文献
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行星齿轮传动静力学均载分析 总被引:8,自引:2,他引:8
建立了2KH型行星齿轮传动系统的计算模型,从静力学角度分析了系统的均载机理。针对各构件的制造和安装误差,运用当量啮合误差的原理,计算了该系统的均载系数,并分析了各误差变化对系统均载情况的影响,以供工程应用参考。 相似文献
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两级星型齿轮传动静力学均载分析 总被引:7,自引:1,他引:7
建立了具有双联星轮的二级星型齿轮传动系统的静力学计算模型 ,分析了该系统均载机理 ,对由于制造误差和安装误差引起的不均载进行了静力学分析。运用综合当量啮合误差的原理和浮动构件的静力平衡关系 ,计算了各星轮、各级传动和该系统的均载系数 ,分析了各误差和均载系数的关系 ,获得了对系统均载性能影响最大的误差元素 ,为双联星型传动装置的均载性能的优化设计提供了依据 相似文献
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The mesh stiffness is close to rectangular stiffness, and the first harmonic approximate term of rectangular stiffness is generally adopted in the nonlinear gear dynamic analysis. The differences between the rectangular stiffness and its approximate form are analyzed in detail. The frequency response and dynamic factor are calculated by a numerical method, to illustrate the dynamic characteristics of the gear nonlinear system with different mesh stiffness forms. The results show that: The trends of frequency response of gear dynamic system with rectangular stiffness and its approximate form are identical. The jump phenomena are detected in both cases. Without the effect of static transmission error, the dynamic factor with rectangular mesh stiffness is larger than that with approximate mesh stiffness. Under design power and speed condition, the result with approximate mesh stiffness function may deduce reasonless suggestions for a designer. The static transmission error will enlarge the vibration amplitude and dynamic factor when the approximate mesh stiffness is adopted, but the effects on the response of gear system with rectangular mesh stiffness are fractional. The mesh stiffness may excite the odd subharmonic resonance, and the static transmission error may excite the even sub-harmonic resonance respectively. 相似文献
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Load sharing characteristics of planetary transmissions 总被引:23,自引:0,他引:23
Ahmet Kahraman 《Mechanism and Machine Theory》1994,29(8):1151-1165
A nonlinear time-varying dynamic model of a planetary transmission with an arbitrary number of pinions is developed. The model includes several manufacturing errors and assembly variations, and can accommodate for any pinion spacing arrangement, tooth separations and time-varying gear mesh stiffnesses. A dynamic load sharing factor KDLS, which is defined as the ratio of the actual dynamic load at a given gear mesh to the ideal static load, is predicted using the dynamic model. Key design parameters, assembly variations and manufacturing errors are identified, and their effects on KDLS are quantified. 相似文献
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为研究动态下各影响因素对行星传动均载性能的影响,以2K-H行星齿轮传动系统为研究对象,综合考虑各零件的加工误差、装配误差、轮齿啮合时变刚度及间隙等因素对行星齿轮均载性能所产生的影响,建立了该系统的非线性统动力学模型。采用Newmark法求解,得到了载荷分配系数的时域历程及太阳轮和内齿圈的浮动轨迹,计算了各项误差对载荷分配系数的灵敏度,研究了零件各项误差对行星传动均载效果的影响,对行星齿轮传动的设计提供了依据。 相似文献
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Time?varying mesh stiffness(TVMS) and gear errors include short?term and long?term components are the two main internal dynamic excitations for gear transmission. The coupling relationship between the two factors is usually neglected in the traditional quasi-static and dynamic behaviors analysis of gear system. This paper investigates the influence of short?term and long?term components of manufacturing errors on quasi?static and dynamic behaviors of helical gear system considering the coupling relationship between TVMS and gear errors. The TVMS, loaded static transmission error(LSTE) and loaded composite mesh error(LCMS) are determined using an improved loaded tooth contact analysis(LTCA) model. Considering the structure of shaft, as well as the direction of power flow and bearing location, a precise generalized finite element dynamic model of helical gear system is developed, and the dynamic responses of the system are obtained by numerical integration method. The results suggest that lighter loading conditions result in smaller mesh stiffness and stronger vibration, and the corresponding resonance speeds of the system become lower. Long?term components of manufacturing errors lead to the appearance of sideband frequency components in frequency spectrum of dynamic responses. The sideband frequency components are predominant under light loading conditions. With the increase of output torque, the mesh frequency and its harmonics components tend to be enhanced relative to sideband frequency components. This study can provide effective reference for low noise design of gear transmission. 相似文献