PlanetGearTrain

1、Planet Gear Train Jan, 20132CONFIDENTIALThe following pages contain proprietary information and are not intended for external publication or disclosure2010 MoogMoog Intellectual & Proprietary Information LegendThis technical Data/Drawing/Document contains information that is proprietary to, and is t

2、he express property of Moog Inc., or Moog Inc. subsidiaries except as expressly granted by contract or by operation of law and is restricted to use by only Moog employees and other persons authorized in writing by Moog or as expressly granted by contract or by operation of law. No portion of this Da

3、ta/Drawing/Document shall be reproduced or disclosed or copied or furnished in whole or in part to others or used by others for any purpose whatsoever except as specifically authorized in writing by Moog Inc. 3Agenda Types of Gear Train Ratio of Planetary Gear Train Planetary Gear Product and Applic

4、ation Failure Analysis4What is A Gear Train?用一系列互相啮合的齿轮将主动轴的运动传到从动轴，这种多齿轮的传动装置成为轮系。 定轴线轮系(定轴轮系) Ordinary Gear Train所有齿轮转动轴固定All gear axes fixed 动轴线轮系(周转轮系) Epicyclic Gear Train一个或一个以上齿轮轴线绕固定轴回转One or more gear axis rotates by one fixed axis一个自由度： 行星轮系 Planetary Gear Train两个自由度： 差动轮系 Differential Gea

5、r Train 必须有两个输入才有确定的运动行星轮系和差动轮系统称行星传动 定轴轮系动轴轮系 5有的轮系既包含定轴轮系，又包含动轴轮系，则形成了混合轮系。14速变速器动轴轮系定轴轮系Ancient Mechanical Gearing6Epicyclic differential gearing, used for calendrical computation, has been identified in Greek around 87 BC.This is not a Planetary Gear7以下机构用于早期蒸汽涡轮机，从图可以看出，其包含黄色的太阳轮，红色的行星轮与绿色的行星架。

6、黄色主动轮转两圈，行星轮轴绕其轴线转一圈，减速比为2，但是行星轮自身不转动，且主动轮与行星架固定，所以不属于行星齿轮传动。Other Type of Planetary Gear8摆线针轮行星传动Cycloidal (Plano-eccentric)传动比范围大，单击6119，三级传动可达658503体积小，重量轻，为普通圆柱齿轮体积的1/22/3，质量1/31/2效率高，单击效率0.90.95工作平稳噪声低工作可靠，寿命长加工制造精度要求高转臂轴承为其薄弱环节谐波齿轮传动Harmonic依靠弹性变形实现传动，不属于行星传动传动比大，单级70320侧隙小精度高零件数少，安装方便体积小，重量轻承

7、载能力大效率高工作平稳可向密闭空间传递运动l 三种传动形式在EMA中都有应用9Main Function of Epicyclic Gear Train 变速alter shaft rotation速率 Velocity方向 Direction 变力Multiply torque 速度的分解与合成（差动轮系only）用于滚齿机或汽车的差速机构 Merit (compare with ordinary gear train)体积小 compact size质量轻 Low weight传动比范围大 Large range of gear ratio最高单级可达几千效率高 High efficien

8、cyup to 99%工作平稳 Smooth working Demerit结构复杂 Complicated structure制造加工精度要求高 High requirement of manufacture装配困难 Difficult to assembly10Types of Planetary Gearing1.By componentsZ(K)-中心轮， X(H)-转臂， Y(V)-输出轴 2Z-X 3Z Z-X-Y Z-X(括号内为前苏联使用符号)2.By method of meshN-内啮合， W-外啮合， G-公用行星轮， ZU-锥齿轮NGWNWNNWWNGWNNZUWGW1

9、1Gear Ration of Planetary Gearing12Gear Ration of Planetary GearingINPUTOUTPUTTabular(superposition) methodTo account for the combined rotation and revolution of the planet gear, we use a two step process.First, we lock the whole assembly and rotate it one turn Counter-Clockwise. (Even the Ring, whi

10、ch we know is fixed) We enter this motion into a table using the convention:CCW = PositiveCW = NegativeRingPlanetSunArm13Gear Ration of Planetary GearingNext, we hold the arm fixed, and rotate whichever gear is fixed during operation one turn clockwise. Here, we will turn the Ring clockwise one turn

11、 (-1), holding the arm fixed. The Planet will turn NRing / NPlanet turns clockwise. Since the Planet drives the Sun, the Sun will turn (NRing / NPlanet) x (-NPlanet / NSun) = - NRing / NSun turns (counter-clockwise). The arm doesnt move.We enter these motions into the second row of the table.SunPlan

12、etRingArmRotate WholeAssembly CCW+1+1+1+1Hold Arm, RotateRing CWNRing / NSun- NRing / NPlanet-10INPUT1 TurnRingPlanetSunArm14Gear Ration of Planetary GearingFinally, we sum the motions in the first and second rows of the table.SunPlanetRingArmRotate WholeAssembly CCW+1+1+1+1Hold Arm, RotateRing CWNR

13、ing / NSun- NRing / NPlanet-10Total Motion1 + NRing / NSun1 - NRing / NPlanet0+1Now, we can write the relationship:SunSunNRingNArmArmSunRingSunnnnNNnor11,1If the Sun has 53 teeth and the Ring 122 teeth, the output to input speed ratio is +1 / 3.3 , with the arm moving the same direction as the Sun.T

14、hen, ratio15Application and Products of Planetary Gearing1. Gear UnitCompact sizeLarge gear ratioHigh torque outputGeneral industrialSEW Planetary Gear UnitPCS Gear Unit三级行星减速 i = 194.06常用输出扭矩 3400Nm额定输入转速 1198/min结构图点此重庆重齿16Application and Products of Planetary Gearing2. 自动变速箱 Automatic Transmissio

15、nContinuously variable Transmission(CVT) is a transmission in which the ratio of the rotational speeds of two shafts, as the input shaft and output shaft of a vehicle or other machine, can be varied continuously within a given range, providing an infinite number of possible ratios.Infinitely variabl

16、e transmission(IVT) is a development of continuously variable transmission which use a planetary gear system.Electrical variable transmission(EVT) is a combination of CVT and electric motor.Mostly used in high gas-mileage, hybrid and electrical car, helps car working at highest efficiency condition17Application and Products of Planetary Gearing3. EMA1). Reduction gear unit integrated in GEA series as a option of servomotorA single stage planetary gear unit is used to d