CN2320843Y - 行星钢球无级变速器 - Google Patents
行星钢球无级变速器 Download PDFInfo
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Abstract
一种摩擦传动采用碟簧加压压紧力能随调速与转矩成正比增减的行星钢球无级变速器,它有二个圆弧圆锥面的主动轮、二个内凹圆弧曲面外压圈同与钢球行星轮点接触。二外压圈轴向平移分合使钢球和主动轮位移,接触点和传动半径以及碟簧的压缩量的变动实现了恒功率传动。钢球以轴孔由滚针与T形销轴动配,调速方便范围增大。
Description
本实用新型涉及一种摩擦传动采用碟簧加压的无级变速器,尤其是能够自行改变碟簧产生的压紧力与调速转矩成正比增减的行星钢球无级变速器。
采用摩擦传动副的无级变速器设有加压装置,分恒压加压和自动加压,以碟簧加压的属于恒压加压,它在调速中压紧力基本上维持恒定,对于作恒功率传动随着调速转速降低转矩相应增大压紧力必须增大,在高转速区则应按比例减少以便降低损耗减少发热来提高传动效率。自动加压装置虽有压紧力与转矩同步增减,但其结构复杂容易损坏且不能防止过载,特别是目前市场较常用的行星锥盘无级变速器,它采用碟簧加压,但在调速中碟簧压紧力与转速的降低转矩增大所需的却成反比,因为向低转速调时行星轮作径向外移,镶体从二个主动轮中退出而使碟簧放松压紧力不足传动会打滑,向高转速调时因为锥轮作径向挤进碟簧压紧力增大传动发热高损耗大,为减轻这种相矛盾的增减变化只得将锥轮设计得扁平,但造成调速位移困难且严禁停机时调速影响到使用范围。
本实用新型的目的是提供一种同样采用简便的碟簧加压而它的压紧力与转矩增减相一致的行星钢球无级变速器,它兼有恒压加压和自动加压装置的双重优点却克服了它们的不足完全实现了恒功率传动。
本实用新型的目的是这样实现的:在输入花键轴上套有二个圆弧圆锥曲面的主动轮,外侧有碟簧始终压紧着使其趋势于轴向靠拢,一组钢球行星轮进入主动轮之间而承受碟簧的压紧力总是力图作径向外移,二个外压圈工作面是内凹圆弧(小于半圆)总是包含抱合着钢球行星轮使其不再任意外移并接受来源于碟簧产生的压紧力,四个圆弧的半径是R同比钢球的半径r大e即R-r=e,e的范围较宽,常取e=5~8mm。四个圆弧曲面以垂直于钢球轴孔线的中心截面为对称,方向对应,圆弧与球面点接触,其初始工位:二个主动轮圆弧曲面半径R的圆心点至中心轴(输入轴)的距离大于二个外压圈圆弧曲面半径R的圆心点分布圆半径(圆心点至输入轴距离)即成四圆弧曲线包容抱合钢球,从圆弧曲面半径R的中心点通过球心至圆弧曲线与球面交点成为三点一直线,这种结构工位就是形成钢球以圆弧曲面作纯滚动点接触。当二个外压圈受到蜗杆蜗轮及移动座的螺旋副传动作轴向平移,二个外压圈以接触点传递压力推动钢球作径向内移(钢球的分布圆半径减少)其接触点逐步变动(向钢球轴孔中心移动)传动半径减少,公转速度变慢。钢球的径向内移同时迫使二个主动轮作轴向分开平移,接触点也逐步变动:使钢球的传动半径增大,使主动轮的传动半径减少,所以钢球自转速度降低。这时的主动轮因为传动半径逐步减少,圆周力按比例增大,足以能够传动低转速所增大了的额定转矩,所以允许碟簧压紧力逐步增大。由于主动轮轴向分开平移使碟簧被压缩压紧力增大,其压紧力按碟簧的轴向压缩量来设计控制,确保恒功率传动。在调速位移中所控制碟簧压缩量就可以控制传动的压紧力,防止了过载又不致于打滑。其次是钢球与圆弧曲面调速位移接触点的变迁使法向正压力按1/sinβ的倍数增减,尤其是低转速区域,法向正压力增大得较大,和碟簧的再度压缩所增大的压紧力相加一起使电机的有效功率得到充分发挥。上面所述的R-r=e和O1>O>O2(分别是主动轮、钢球、外压圈圆弧半径中心点至输入轴中心线距离)以及四个圆弧半径R大小相等方向对称(以垂直于钢球中心截面)且接触点、钢球圆心点和圆弧半径圆心点三点成直线的动态和静态工位结构是本实用新型的基本特征,由此实现了调速范围转矩与压紧力同步增减并达到恒功率传动的行星钢球无级变速器。
钢球行星轮以轴孔由滚针与T形销轴动配,T形销轴的T形端头联接到输出轴或一个轴承内圈套圈相对应T形滑移槽中,便于作径向位移。T形销轴在输出轴滑移联接作转臂行星式输出;T形销轴与轴承内圈的套圈滑移联接作差动行星式输出,并使钢球行星轮分布均匀,适应于高速自转,差动式的调速范围扩大了,输出转速到“零输出”后又反转。
本实用新型的二个外压圈有较大的轴向分合移距范围,由于通过蜗杆蜗轮与螺旋副使外压圈作轴向平移传动比较大,所以调速轻便,停机时可以调速。
下面结合附图和实施例对本实用新型进一步说明。
图1是本实用新型转臂输出式的结构图。
图2是本实用新型转臂输出式另一种形式的结构。
图3是本实用新型的差动式的结构图。
图4是本实用新型转臂输出式的一个工位截面坐标。
图5是本实用新型差动式的一个工位截面坐标。
图中:1.输入花键轴(简称输入轴) 2.碟簧 3.主动摩擦轮(简称主动轮)4.钢球行星轮(简称钢球) 5.摩擦外压圈(简称外压圈) 6.T形销轴(简称销轴)7.输出轴 8.轴承内圈套圈(简称套圈) 9.移动座
在图1中,输入轴(1)支承于二个轴承上中间活动套有二个主动轮(3)和碟簧(2),碟簧(2)始终压紧着二个主动轮(3)趋势于作轴向压拢平移,钢球(4)进入二个主动轮(3)和碟簧(2)传递压紧力的中间位置受压后总是要作径向外移,钢球(4)有轴孔由滚针与T形销轴(6)动配,销轴(6)的端头联接于输出轴(7)的T形滑移槽中可以灵活地作径向位移并传递转矩,二个外压圈(5)以内凹圆弧曲面点接触包容抱合着钢球(4),在初始工位时二个外压圈(5)的轴孔中心转动的接触点的半径为最大,所以绕外压圈(5)圆弧曲面上公转转速为最高,而这时的接触点上的压紧力为最小,适合于高转速传动。二个外压圈(5)作轴向合拢平移是由蜗杆、蜗轮和螺旋副联动外压圈(5)作轴向推进,圆弧曲面平移,与钢球(4)的交点变动着,推动钢球(4)作径向内移,迫使二个主动轮(3)作轴向分开平移,与钢球(4)的接触点逐步变动,传动半径的逐步减少使钢球(4)自转转速降低,这时的碟簧(2)被主动轮(3)的轴向移距再度压缩,压紧力按压缩量的比值增大,设计时按恒功率传动计算定值。其次因为钢球(4)位移接触交点变迁,压紧力的法向正压力按1/sinβ的倍数增大并总是与转矩增减相一致。
图3是本实用新型的差动式行星钢球无级变速器的结构图,它将T形销轴(6)联接在一个轴承内圈(8)T形滑移槽中,让钢球行星轮(4)以销轴(6)自转且分布均匀,还让二个外压圈(5)轴向平移量增大,输出转速到零后还反转到输入转速的(0.15~0.20)n(n为输入轴转速)。
图4和图5是本实用新型转臂输出式和差动输出式的初始工位图:二个主动轮(3)的圆弧圆锥曲面半径为R,圆心点为O1,O1点与输出轴中心线距离称为工位坐标高度,简写为O1,同样二个外压圈(5)圆弧曲面半径为R,圆心点是O2,坐标高度为02,钢球(4)半径为r,圆心(或称球心)为O点,坐标高度为O,O1、O、O2三个圆心点在整个工位平移和位移中始终有着确定的范围,就是O1>O>O2,也就是说在整个调速范围各圆弧中心点平移和位移符合钢球(4)在圆弧曲面(R)上的纯滚动点接触,从O1点或者02点通过O点到圆弧(R)与钢球(4)的交点始终是三点成一直线,这种坐标关系便于设计计算并控制碟簧(2)的压缩量,也就是使碟簧(2)按转矩所需要的压紧力工作。
本实用新型由于有了确定的圆弧曲面的半径大小、方向和坐标工位以及各圆弧曲面与钢球的点接触,调速平移中接触点相对滚动分离与结合,滑移量明显减小,摩擦压紧力又能控制得当,使整个调速和运行中减少了滑动,防止了打滑和过载,提高了使用寿命和传动效率,给运行过程实现了长期稳定性和可靠性从结构上提供有效保证。
Claims (4)
1、一种摩擦传动的行星钢球无级变速器,装有输入轴、主动轮、行星轮、外压圈、输出轴、碟簧和移动座,其特征是:传动工作面是圆弧圆锥曲面的二个主动轮和碟簧活套在输入轴上压紧一组钢球行星轮,二个内凹圆弧曲面的外压圈在外圈包含抱合钢球行星轮,钢球行星轮以轴孔由滚针与T形销轴动配联接。
2、根据权利要求1所述的行星钢球无级变速器,其特征是:二个主动轮的圆弧圆锥曲面半径R、二个外压圈内凹圆弧半径R、钢球行星轮的半径r其关系是:R-r=e,e常取5~8mm。
3、根据权利要求1所述的行星钢球无级变速器,其特征是:主动轮圆弧半径R的圆心点O1、钢球行星轮的球心点O、外压圈的圆弧半径R的圆心点O2与输入轴中心线工位距离应符合O1>O>O2。
4、根据权利要求1所述的行星钢球无级变速器,其特征是:钢球行星轮以轴孔由滚针与T形销轴动配合联接,T形销轴的T形端头联接到输出轴相对应的T形槽中或者一个轴承内圈套圈的T形滑移槽中活接。
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CN111457066B (zh) * | 2020-04-09 | 2021-07-23 | 重庆大学 | 轴承式牵引减速器 |
CN111457066A (zh) * | 2020-04-09 | 2020-07-28 | 重庆大学 | 轴承式牵引减速器 |
CN111720508A (zh) * | 2020-06-04 | 2020-09-29 | 陈驰川 | 薄壁结构行星传动变速机 |
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