行星滚子传动

本刊1982年第三期对滚动传动的基本原理、行星滚轮传动减增速机的研制以及滚动传动中润滑油牵引系数的测定等问题作了简要介绍。因为行星滚动传动具有很多优点,一些国家对此十分重视。日本在研制行星滚轮减增速机的同时,还研制了行星滚子传动的减增速机、制动器、联轴节、差动器等,进一步发挥了行星滚动传动的优势,扩大了实际应用范围。本文主要介绍行星滚子传动装置的基本结构、速比关系、滚子传动装置的特点、润滑油的选用以及设计中应该注意的问题。     

液粘调速离合器摩擦片的测试和研究

液粘调速离合器是利用摩擦片间的相对滑动来实现无级变速的新型传动装置.由于它的动力传递、转矩改变和转速的调节都是靠液体的粘性牵引来实现的,所以这种传动实质上就是液体粘性的牵引传动.着重阐述在实际工况,根据对比试验,证实我们设计研制摩擦片的适应性.     

滚子活齿行星传动(二)

四、滚子活齿行星传动的参数计算1.参数选择滚子活齿行星传动,无论从经济性还是加工方便考虑,滚子总是采购现成的为宜,因此通常是以选定滚子尺寸为出发点来计算其他各参数的。(1)滚子的选择     

双摆线滚子行星传动原理初探

双摆线滚子行星减速器是近年来国外研制的一种新型减速器。本文从内、外摆线针轮行星传动原理出发,探讨了双摆线针轮行星传动和双摆线滚子行星传动的组成条件、原理及其内在关系。并讨论了一种典型的两级(双排)双摆线滚子行星减速器。本文还就双摆线滚子行星传动设计中的若干基本问题进行了扼要分析。     

滚子凸轮减速器（啤酒槽传动装置、扶梯传动装置）

该减速器通过环面蜗杆上螺旋槽与滚动星轮体啮合 ,以滚动啮合的方式传递扭矩 ,具有传动功率大、传动比大、结构紧凑、重量轻、传动效率高、噪音小等优点。以滚子凸轮器为中心串联而成的传动装置 ,具有寿命长、效率高特点 ,与同类产品相比 ,既节电、又节省金属材料。SYR系列啤酒过滤槽传动装置是采用滚子凸轮减速器串联而成 ,其传动效率为 90 % ,因而可大量节约能源。经检测 ,该减速器运行噪声平均为 5 9.6dB ,可用于宾馆和商场自动扶梯上。滚子凸轮减速器(啤酒槽传动装置、扶梯传动装置)     

新型双摆线滚子行星传动的研究

[前言]双摆线滚子行星传动的典型结构如图2(A)的正视简图所示。具有短幅外摆线等距曲线轮廓(即外齿齿廓)的内圈通过滚动轴承坐在与输入轴固连在一起的偏心轴上,当输入轴转动时,内圈作行星运动,相当于摆线针轮减速器中的摆线轮。安装着N个滚子的滚子保持架也随着内圈的行星运动作行星运动,相当于摆线针轮减速器中的针轮和针轮架,但滚子保持架不象针轮架那样做定轴轮,而是行星轮。具有短幅内摆线等距曲线轮廓(即内齿齿廓)的外圈,作为定轴轮。这样各个滚子即作为内齿齿廓与内圈外齿廓相啮合传动又作为外齿齿廓与外圈内齿廓相啮合传动,在以后啮合原理的证明中我     

HEV用行星齿轮式动力耦合装置设计与运动分析

基于某款混合动力汽车(Hybrid Electric Vehicle,HEV)动力系统参数,为实现有效传递汽车所需动力的要求,设计了一种行星齿轮式动力耦合装置动力传动结构,并确定了行星齿轮机构的主要参数和传动比;运用UG NX8.0对行星齿轮式动力耦合装置进行建模、装配及运动仿真;通过运动仿真结果得出的机构传动比与理论计算结果对比分析,验证了行星齿轮式动力耦合装置设计的合理性,为后续的有限元分析和结构优化奠定基础。     

PY180型平地机传动方式的改进

PY180型平地机驱动轮的动力传递路线是:发动机→液力变矩器→动力换挡变速器→万向传动装置→中央传动。中央传动内设有自动闭锁差速器,以解决平地机转弯行驶时的内外侧车轮转速不等的问题。左右平衡箱上的中后驱动轮可随地面起伏而作上下摆动,以均衡中后驱动轮的轴载荷,延长驱动轮的寿命,提高平地机的平整性能和牵引附着性能。平衡箱内的轮边减速装置为重型滚子链传动,即主动轴上装有双列主动链轮,而中后轮轴上则各装有一个从动链轮,主从动链轮之间又通过重型滚子链实现动力传递。     

高速行星牵引增速机构研究

对用于高速传动的中空滚子行星牵引增速机构进行了设计研究和试验测试，对该机构输出轴的径向刚度和回转精度进行了分析，并提出了测量传动机构的传动比变化率监测机构运行。分析和试验表明，行星牵引增速机构安全能够胜任高速，超高速传动。     

行星滚轮摩擦传动自适应加载机构研究

设计了一种行星圆柱滚轮摩擦(牵引)传动装置.它由太阳轮、行星轮、中心轮、行星轮保持架和输入轴组成.太阳轮做成中空并与输入轴通过3段对数螺线型面连接.这样,当输入轴输入运动和转矩时,由于3段弧形楔的楔入作用,使得太阳轮产生弹性变形,从而在太阳轮与行星轮之间及行星轮与中心轮之间自动产生摩擦传动所需的正压力.输入转矩越大,楔入作用越强,产生的正压力越大,反之亦然.故此装置具有自作用、自适应特征.由于此行星滚轮摩擦传动装置采用了圆柱滚子,从而避免了因采用圆锥滚子而可能产生的滚子自转现象的出现.也由于采用对数螺线的型面连接,使得被连接型面之间的接触应力呈均匀分布状态,减小了应力集中的现象,提高了连接表面的接触疲劳寿命.该研究拓展了行星滚轮摩擦传动自适应加载的方法.     

高速牵引机构的中空滚子设计研究

采用中空滚子作为行星轮是高速牵引机构的理想设计。本文求解了中空滚子在装配和运行状态下的变形和应力，提出了空心度作为中空滚子的设计主参数，并对空心度的选取范围作了研究     

Influence of the size,geometry, and material of the rollers on EHD traction

The influence of the parameters relating to the rolling elements on traction in EHD contacts is experimentally studied on a two-roller machine, in which experiments with point contacts are conducted for two paraffinic mineral oils, a synthetic naphthene, and a synthetic ester. Firstly, it is shown that the same traction curves are obtained in both internal and external contacts when the effective radius in rolling direction of the rollers is equal. The effect of an increase in the size of the rollers is to increase the film thickness and this results in a gentle decline in the maximum traction coefficient. As the effective radius in transverse direction is increased, so the traction decreases for a paraffinic mineral oil, while that for a synthetic naphthene remains constant independent of the geometry of the rollers. Finally, the effect of the material of the rollers is studied, employing rollers made of steel, ceramics, phosphorus bronze, brass, and aluminium alloy. The traction obtained under an identical normal load can be arranged according to the effective elastic modulus of the rollers for each oil. However, under identical contact pressure the same maximum traction curve is obtained independent of the material, but the decline in traction in the thermal region is slightly steeper with the ceramic than with the steel rollers because of the difference in the temperature rise of the fluid film.     

行星牵引传动在冷却塔中的应用

光滑圆柱体组成的行星牵引传动具所有超低噪音、超低振动的优良特性，非常适合对噪音要求较高的场所。本文研究了行星牵引传动的原理，实现牵引传动的技术关键及加载机构的设计。给出了一种应用牵引传动原理设计低噪音冷却塔行星牵引传动减速器的依据和要点。     

轧钢车间辊道设计的研究与应用

阐述了如何选取轧钢车间辊道的基本参数,包括辊子直径、辊身长度、辊距、辊道速度等参数。轧钢车间辊道的传动形式可分为集体传动辊道和单独传动辊道两种,针对应用广泛的单独传动辊道,通过实例计算来介绍如何设计选型辊道电机,并对计算结果进行了验算,与以前该类辊道的计算方法相比,不仅对单独传动辊道进行了设计计算,而且还通过实例对计算结果进行了验算,这有助于提高计算结果的实际意义,实际使用结果证明该计算和验算方法有效。     

An ultraprecision positioning system using a twist-roller friction drive

For ultraprecision positioning, the use of the twist-roller friction drive is proposed. To improve the positioning accuracy of conventional twist-roller friction drives, the proposed design has two features: (1) the twist angle between the driving shaft and the driven rollers is very small, and (2) the driven rollers are supported by hydrostatic bearings. The twist-roller friction drive is mechanically a kind of lead screw, and the small twist angle makes the lead of the friction drive less than 0.1 mm. The use of hydrostatic bearing is effective for improving the rotational accuracy of the driven rollers and for eliminating the influence of the fluctuation in roller rotation on positioning accuracy. It has been shown by experiments that the resolution of positioning can be less than 10 nm, and the twist-roller friction drive is suitable for an ultraprecision positioning system.     

Experimental and computational investigation of the traction coefficient of a ball traction drive device

Traction drive is a new kind of drive manner in which the power is transmitted by a thin oil film between transmission elements. This paper describes a ball traction drive device. The quasi-dynamics analysis was carried out for the transmission components of the ball traction drive device. The traction coefficients of oils Ub2 and HH-20 were calculated respectively with different rheological models. The elastohydrodynamic lubrication (EHL) film thickness and the traction coefficient between traction drive elements were measured. The results of the calculations are consistent with experiments.     

Effect of Tangential Traction and Roughness on Crack Initiation/Propagation During Rolling Contact

Rolling-fatigue tests of 0.45 percent carbon steel rollers were carried out using a four-roller-type rolling-contact fatigue tester. Tangential traction and surface roughness of the harder mating rollers were varied and their effect was studied. The results of the study indicate that the fatigue life decreases when traction is applied in the same direction as that of rolling. When the direction of traction is reversed, the life increases over that obtained with zero traction. The roughness of harder mating rollers also has a marked influences on life. The smoother the mating roller, the longer the life. Microscopic observation of specimens revealed that the initiation of cracks during the early stages of life is more strongly influenced by the surface roughness, while the propagation of these cracks in the latter stages is affected mainly by the tangential traction.     

Effect of surface roughness on elastohydrodynamic traction. Part 2

To investigate the performance of a traction‐drive toroidal continuously variable transmission, the traction characteristics under partial elastohydrodynamic lubrication contact were calculated theoretically based on roller test results. A calculation model was constructed for considering the effects of surface roughness on performance. The model incorporated a viscoelastic and elastic‐plastic model using a nonlinear Maxwell model to represent the rheological behaviour of the traction fluid. The validity of the model was confirmed by its good agreement with the experimental results described in Part 1 of this paper. Various calculations were made to investigate the effect of surface roughness on traction under the operating conditions of an actual traction drive. The results indicated that the effect of surface roughness on durability could not be ignored.     

圆锥滚子凸度超精研锥柱匹配导辊形面分析

提出圆锥滚子凸度贯穿式超精研修形加工的一种新型的锥柱匹配的导辊配置方式,其后导辊是圆柱形形面,可通用于不同型号的滚子;其前导辊采用匹配的专用螺旋锥形形面。对锥柱匹配导辊配置方式的滚子姿态进行简化分析表明,这是一种具有特定滚子姿态的斜置贯穿式超精研,可以获得凸度。依据共轭曲面原理建立斜置贯穿式超精研导辊的理想形面方程,通过数值计算分析锥柱匹配导辊形面和相应滚子姿态问题,结果表明,一般斜置贯穿式超精研前后导辊理想形面的轴向截形均为相对于导辊轴线倾斜的轻微内凹曲线,但存在特定的滚子姿态,可以使后导辊形面曲线不倾斜而只有轻微内凹;锥柱匹配导辊配置方式中,后导辊的圆柱面是近似形面,但其形状误差很小,一般不超过4 μm,对滚子的支撑稳定性影响不大。给出了锥柱匹配导辊配置方式中圆柱导辊形状误差、锥形导辊形面参数以及相应滚子姿态参数的精确计算方法。     

On The Dynamic and Thermal Performance of a Zero Clearance Auxiliary Bearing(zcab) for a Magnetic Bearing System

Structural and thermal analysis of a zero clearance auxiliary bearing (ZCAB) for magnetic bearing systems is presented. The ZCAB consists a series of rollers whose centers are initially placed on a circle. At the open condition all rollers have an initial clearance about the rotating shaft. As the shaft drops on the ZCAB rollers, either due to failure of the magnetic bearing system or a transient shock, the centers of the rollers move circumferentially along a curve path and after eliminate the initial clearance by closing around the shaft and re-centering it. This is known as the closed condition. The overall stiffness of the ZCAB will then depend on the stiffness of each single roller and the initial clearance between the rollers and the shaft. This is affected by the number of rollers that will touch the shaft which will also vary the load applied on the rollers. The low shaft-rollers traction coefficient and overall dynamic support characteristics obviate the possibility of backward whirl, however this traction and the generated heat in the rolling element embedded in the rollers are sources of heat generation. This paper presents the results of a transient analysis for the ZCAB structural stiffness. A preliminary thermal model of the ZCAB and comparison between the predictions and test results are also discussed. Some design guidelines are presented to help improve the performance of the ZCAB in the case of high temperature working conditions.