CN1922413A - 等速万向节 - Google Patents

等速万向节 Download PDF

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CN1922413A
CN1922413A CNA2004800416261A CN200480041626A CN1922413A CN 1922413 A CN1922413 A CN 1922413A CN A2004800416261 A CNA2004800416261 A CN A2004800416261A CN 200480041626 A CN200480041626 A CN 200480041626A CN 1922413 A CN1922413 A CN 1922413A
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universal joint
constant velocity
velocity universal
coupling shaft
inner piece
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石岛实
山崎健太
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NTN Corp
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/20Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
    • F16D3/22Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts
    • F16D3/223Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/06Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/20Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
    • F16D3/22Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts
    • F16D3/223Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts
    • F16D3/224Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts the groove centre-lines in each coupling part lying on a sphere
    • F16D3/2245Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts the groove centre-lines in each coupling part lying on a sphere where the groove centres are offset from the joint centre
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/10Quick-acting couplings in which the parts are connected by simply bringing them together axially
    • F16D2001/103Quick-acting couplings in which the parts are connected by simply bringing them together axially the torque is transmitted via splined connections
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/20Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
    • F16D3/22Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts
    • F16D3/223Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts
    • F16D2003/2232Elements arranged in the hollow space between the end of the inner shaft and the outer joint member

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Steering Controls (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

本发明的目的在于实现高刚度、轻重量的等速万向节的连接轴,并减少加工成本。中空的连接轴(5)设置有轴端部分(5c)和从轴端部分(5c)延伸的中间部分(5d),其中所述轴端部分(5c)具有齿,所述齿与内部件(2)的接合部分(2d)接合。为模制出连接轴(5),具有外直径dm的制管材料的端部分被脱模形成,然后齿(齿条或锯齿)通过成形轧制或类似方法被模制于在轴端侧上的拉模制成的轴端部分(5c)的外表面中。轴端部分(5c)的外直径是ds,而中间部分(5d)的外直径与制管材料的直径一样为dm(ds<dm)。

Description

等速万向节
技术领域
本发明涉及一种等速万向节,在所述万向节中中空连接轴连接于内部件的接合部分,更具体地,本发明涉及适合于汽车的转向驾驶盘、传动轴(propeller shaft)或驱动轴(drive shaft)的万向节。
背景技术
等速万向节广义地分为固定型和滑动型,其中所述固定型仅仅允许两轴之间的角位移而所述滑动型允许角位移及轴向位移,并且每一种类型都根据工作条件、应用以及类似条件而被选择。球笼式(Rzeppa-type)等速万向节(球固定万向节(ball fixed joint))是典型的固定型,而双偏置型(double offset-type)等速万向节是典型的滑动型。
前述等速万向节被广泛地使用在汽车的传动装置中,例如用于连接汽车的驱动轴或传动轴。为连接汽车的驱动轴或传动轴,固定型和滑动型等速万向节通常被成对地使用。例如,用于将汽车发动机的动力传递到车轮的传动装置不得不符合对应于发动机和车轮之间的相对位置关系的变化的角位移和轴向位移。因而,安装在发动机侧和车轮侧之间的驱动轴的一端通过滑动型等速万向节被连接于差速器,而另一端通过固定型等速万向节被连接于车轮。
在等速万向节中,作为抵御车辆及类似物的震动的措施,一种情况是阻尼器被连接于连接轴,而其中所述连接轴连接到内部件的接合部分,或者增大连接轴的直径并且连接轴被做成是中空的从而确保高扭转刚度和抗挠刚度并同时减轻连接轴的重量。已经知道,弯曲(flexural)第一固有频率的调谐(tuning)作为抵御拍打声、中速或高速压抑的声音及类似声音的措施是有效的。因而,前述阻尼器被设置或者连接轴被做成大直径并中空的。但是附加阻尼器引起成本的增加。另外,虽然可调整频率,但是不能预期增强连接轴的扭转刚度。
发明内容
本发明的目的是在等速万向节中同时实现连接轴的刚度的增加及重量的减轻,并且还减少制造成本。
为了解决前述问题,根据本发明的等速万向节包括:外部件,所述外部件设置有球形内表面,多个轨道凹槽被形成在所述球形内表面中;内部件,所述内部件设置有球形外表面,多个轨道凹槽被形成在所述球形外表面中;布置在楔形球轨道中的球,所述楔形球轨道由外部件的轨道凹槽和内部件的轨道凹槽之间的配合形成;和保持器,所述保持器布置在外部件的球形内表面和内部件的球形外表面之间,从而保持球,球通过预载施加装置始终与球轨道接触。
等速万向节还包括中空的连接轴。中空的连接轴设置有轴端部分和从轴端部分延伸的中间部分,所述轴端部分具有齿,所述齿与内部件的接合部分接合。连接轴的中间部分的外直径(dm)与外部件的外直径(DOUTER)的比值r3(=dm/DOUTER)为0.26≤r3≤1.0。
由于使转向等速万向节的连接轴是中空的,可减少它的重量并增加刚度。另外当滑动机构被设置为转向系统时,连接轴可与诸如滑动花键(slidespline)的外部管部件整体地模制而成。
外部件的外直径(DOUTER)和内部件的接合部分中的齿的节圆直径(PCDSERR)之间的比值r2可被设定在范围3.0≤r2≤5.0中。
3.0≤r2≤5.0的理由如下。即,内部件的接合部分中的齿的节圆直径(PCDSERR)不能关于连接轴的强度等而大范围地变化。因此,r2的值主要依赖于外部件的外直径(DOUTER)。如果r2<3.0(通常当外直径DOUTER小时),每一个部件(外部件,内部件及类似部件)的厚度变得太薄,以致于令人担心强度。另一方面,如果r2>5.0(通常当外直径DOUTER大时),由于它的尺寸以及类似原因会产生实际的问题,并且不能实现小型化的目的。3.0≤r2≤5.0可充分地确保外部件及类似部件的强度以及万向节的耐久性,并且同时满足实际的要求。
前述的中空的连接轴通过拉拔(drawing)具有外直径(dm)的管材料的端部分而模制成。
本发明具有如下效果。
(1)通过使连接轴中空并增大连接轴的直径可同时实现连接轴的高刚度和轻重量。
(2)增加轴部分的固有频率扩大频率选择的范围(调谐),从而便于进行最佳调谐,以减小摆动。
(3)因此,可改善机动车辆的NVH特性。
(4)当连接轴通过拉拔制管材料模制成时,保持低拉拔率(drawingradio),从而可减少制造成本。
(5)通过使用用于转向的万向节,可在任意操作角度确保等速,从而增加车辆的设计柔性。
附图说明
图1是本发明应用于用于转向的等速万向节的情况下的万向节的纵向剖视图;
图2是图1的万向节的横截面视图;
图3是柱塞单元部分的剖视图;
图4是柱塞单元部分的放大剖视图;和
图5(A)是转向装置的俯视图,(B)是转向装置的侧视图,而(C)是转向装置的立体图。
具体实施方式
将在下文中详细地说明根据本发明的等速万向节的实施例。以下说明的实施例以本发明应用于作为固定型等速万向节中的一种的球笼式等速万向节(BJ)作为例子。然而,本发明并不仅限于此,还可应用于底割自由型(undercut free-type)(UJ)。根据本发明的等速万向节不仅可用于转向也可用于驱动轴或传动轴。
首先,将简要地解释其中安装有固定型等速万向节的转向装置。如图5(a)到图5(c)中所示,为了将方向盘(steering wheel)的旋转运动转换为横拉杆(tie rod)69的往复运动的目的,转向装置通过由一个或多个转向轴62构成的转向柱,将方向盘66的旋转运动传递到转向器(steering gear)68。如果由于安装空间或类似原因转向轴62不能被成一直线地布置,一个或多个联轴器被布置在转向轴62之间以便即使在将转向轴62偏向的情况下也能够将正确的旋转运动传递到转向器68。根据本发明的实施例的固定型等速万向节被用作联轴器61。图5(b)中的符号α代表万向节的偏向角度,可设定超过30°的大偏向角度。
如图1中所示,固定型等速万向节具有连接轴5,所述连接轴5通过轭(yoke)连接于转向轴。
中空的连接轴5由轴端部分和从轴端部分延伸的中间部分构成,所述轴端部分具有连接于内部件2的接合部分2d的齿。在本实施例中,连接轴5通过拉拔或冲压成形外直径为dm的管材料的轴端部分而模制成,然后齿(花键(spline)或锯齿状突起(锯齿,serration))通过成形轧制(formrolling)或类似方法被模制在轴端侧的拉拔或冲压成形模制成的轴端部分的外表面中。轴端部分的外直径为ds,而中间部分的外直径与管材料的外直径一样为dm(ds<dm)。
万向节被配置以包括:作为外连接部件的外部件1,在所述外部件1中,六个弯曲轨道凹槽1a在轴向方向上被形成在内直径表面1b中;作为内连接部件的内部件2,在所述内部件2中六个弯曲轨道凹槽2a在轴向方向上被形成在外直径表面2b中,并且用于连接该连接轴5的锯齿状突起(或花键)2d被形成在内直径表面中;六个球3,被布置在球轨道(ball track)中,所述球轨道由外部件1的轨道凹槽1a和内部件2的轨道凹槽2a之间的配合形成;和保持架(retainer)4,所述保持架4将球3可转动地保持在它的套(pocket)4a中(参照图2)。橡胶或树脂罩20被连接在外部件1和连接轴5之间以防止灰尘或类似物进入万向节。
在本实施例中,关于内直径表面1b的球心的外部件1的轨道凹槽1a的中心O1和关于外直径表面2b的球心的内部件2的轨道凹槽2a的中心O2在轴向方向上以相同距离(F)被彼此相对地偏置。保持器4的外直径表面4b的球心和外部件1的内直径表面1b的球心两者都在包括球3的中心O3的万向节中心面O中,其中所述外部件1的内直径表面1b是保持器4的外直径表面4b的引导表面。保持器4的内直径表面4c的球心和内部件2的外直径表面2b的球心两者也都在万向节中心面O中,其中所述内部件2的外直径表面是保持器4的内直径表面4c的引导表面。所以,前述外部件1的偏置量(F)变成轨道凹槽1a的中心O1和万向节中心面O之间的轴向距离。前述内部件2的偏置量(F)变成轨道凹槽2a的中心O2和万向节中心面O之间的轴向距离,并且因此两个偏置量相等。外部件1的轨道凹槽1a的中心O1和内部件2的轨道凹槽2a的中心O2在轴向方向上以相对于万向节中心面O相同的距离(F)相对(轨道凹槽1a的中心O1在万向节的开口侧,而轨道凹槽2a的中心O2在万向节的凹入侧)地偏离。连接外部件1的轨道凹槽1a的中心O1和球3的中心O3的线段的长度和连接内部件2的轨道凹槽2a的中心O2和球3的中心O3的线段的长度中的每一长度都是PCR。两长度相等。
当外部件1以角度θ从内连接部件2偏置时,在任意操作角度θ,由保持器4引导的球3被始终保持在角θ的平分面(θ/2)中,并且因此确保万向节的等速。
在固定的等速万向节中,如图1,图3和图4中所示,柱塞单元(plungerunit)50被连接于连接轴5的轴端以便限制旋转间隙(rotational backlash)。如图3和图4中所示,柱塞单元50是组件,包括:球53,所述球53是按压部件并且按压部分52在它的端部;作为弹性部件的压紧螺旋弹簧(compression coil spring)54;和作为容器部件的壳(case)55,所述壳55用于容纳球53和压紧螺旋弹簧54。压紧螺旋弹簧54是弹性力的来源,它将球53按压在外部件1的更深侧(在球突出方向上)。
将前述柱塞单元50连接于连接轴5的结构如下。
当柱塞单元50的壳55压入配合于或结合于凹入部分5a中时柱塞单元50被固定,其中所述凹入部分5a形成于连接轴5的轴端中。当壳55被完全地固定时,壳55的凸缘55b与连接轴5的轴端表面5b接合,从而柱塞单元50的位置关于轴端表面被固定。换言之,可以固定柱塞单元50的位置,即使由于连接轴5的加工公差,连接轴5的凹入部分5a的深度存在变化,因为凹入部分5a的深度大于柱塞单元50的壳55的轴向长度并且凸缘55b与连接轴5的轴端表面5b相接合。
柱塞单元50的壳55的形状为带底的圆筒形,并且在内直径侧面上突出的接合部分55a被设置在壳55的开口端的边缘。由于接合部分55a的内直径d小于球53的外直径D,可防止球53脱落。所以,球53、压紧螺旋弹簧54和壳55被组装成一个单元。除通过沿整个圆周型锻(swaging)壳55的开口端的边缘而形成接合部分55a之外,各种结构可用作为用于提供接合部分的装置,其中所述接合部分用以防止球53脱落。
如图3和图4中所示,接受部件(receiver member)56被连接于保持器4的外部件1的更深的侧端部。接受部件56为盖状并覆盖保持器4的开口端,并且接受部件56由部分球形的球形部分56a和连接部分56b构成,其中所述连接部分56b形成在球形部分56a的外周并成环形。球形部分56a的内表面(相对连接轴5的表面)是凹入的球形表面,其起到用于承受来自按压部分52的压力的承受部件58的作用。通过诸如冲压和焊接的合适方式将连接部分56b固定于保持器4的端部。
当等速万向节的连接轴5取操作角时为了使柱塞单元50的按压部分52在接受部件56的承受部分58上平稳地滑动,如图4中所示,凹入球形的承受部分58的内直径Ro被设定为大于具有按压部分52的球53的外直径(D/2)(参照图3)(Ro>(D/2))。为了防止取操作角θ时接受部件56和内部件2之间的干涉(interference),承受部分58的内直径Ro被设定为大于保持器4的球形内表面的内直径Ri(Ro>Ri)。
在前述结构中,当连接轴5的锯齿状突起轴部分和内部件2通过锯齿状突起被连接并且附加止动环59以将两者完全地连接(参考图3和图4)时,柱塞单元50的按压部分52与接受部件56的承受部分58彼此接触,然后球53被缩回并且压紧螺旋弹簧54被压紧。由于如上所述柱塞单元50的位置关于连接轴5的轴端表面被固定,可通过稳定按压部分52的连接状态而始终保持按压部分52和承受部分58之间的接触状态,并且因此来自按压部分52的压力可可靠地作用在承受部分58上。
如上述理由,外部件1的外直径(DOUTER)和内部件2的接合部分2d中的齿(锯齿状突起或花键)的节圆直径(PCDSERR)之间的比值r2(=DOUTER/PCDSERR)被设定为3.0≤r2≤5.0。
如上所述,根据本发明的等速万向节可减少比值r2(=DOUTER/PCDSERR)而又确保充分的强度、承载能力以及耐久性,从而还可使外直径(DOUTER)紧凑。
上述本实施例的结构可应用于汽车的传动轴、驱动轴或类似部件的动力的传动机构。

Claims (4)

1.一种等速万向节,包括:外部件,所述外部件设置有球形内表面,多个轨道凹槽被形成在所述球形内表面中;内部件,所述内部件设置有球形外表面,多个轨道凹槽被形成在所述球形外表面中;布置在楔形球轨道中的球,所述楔形球轨道由外部件的轨道凹槽和内部件的轨道凹槽之间的配合形成;和保持器,所述保持器布置在外部件的球形内表面和内部件的球形外表面之间,从而保持球,球通过预载施加装置始终与球轨道接触,其中
等速万向节还包括中空的连接轴,所述连接轴具有轴端部分和从轴端部分延伸的中间部分,所述轴端部分具有与内部件的接合部分接合的齿;并且
连接轴的中间部分的外直径(dm)与外部件的外直径(DOUTER)的比值r3(=dm/DOUTER)为0.26≤r3≤1.0。
2.根据权利要求1所述的等速万向节,其中外部件的外直径(DOUTER)和内部件的接合部分中的齿的节圆直径(PCDSERR)之间的比值r2(=DOUTER/PCDSERR)被设定在3.0≤r2≤5.0的范围中。
3.根据权利要求1或权利要求2所述的等速万向节,其中中空的连接轴通过拉拔或冲压成形具有外直径(dm)的管材料的端部而模制成。
4.一种等速万向节,其中根据权利要求1到权利要求3中的任意一项所述的等速万向节被用于转向或转向装置。
CNA2004800416261A 2004-02-13 2004-12-17 等速万向节 Pending CN1922413A (zh)

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