CN105556147A - 滚动轴承的密封装置 - Google Patents

滚动轴承的密封装置 Download PDF

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CN105556147A
CN105556147A CN201480051617.4A CN201480051617A CN105556147A CN 105556147 A CN105556147 A CN 105556147A CN 201480051617 A CN201480051617 A CN 201480051617A CN 105556147 A CN105556147 A CN 105556147A
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sealing
seal arrangement
inner ring
side plate
rolling bearing
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铃木贵行
宫崎宏之
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NTN Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D55/00—Endless track vehicles
    • B62D55/08—Endless track units; Parts thereof
    • B62D55/088—Endless track units; Parts thereof with means to exclude or remove foreign matter, e.g. sealing means, self-cleaning track links or sprockets, deflector plates or scrapers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
    • F16C33/7823—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region of sealing lips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/783—Details of the sealing or parts thereof, e.g. geometry, material of the mounting region
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7873—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7889—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to an inner race and extending toward the outer race
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/80—Labyrinth sealings
    • F16C33/805—Labyrinth sealings in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C43/00—Assembling bearings
    • F16C43/04—Assembling rolling-contact bearings
    • F16C43/045—Mounting or replacing seals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/164—Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
    • F16J15/3252—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports
    • F16J15/3256—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/36—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers
    • F16C19/364—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/54—Systems consisting of a plurality of bearings with rolling friction
    • F16C19/541—Systems consisting of juxtaposed rolling bearings including at least one angular contact bearing
    • F16C19/542—Systems consisting of juxtaposed rolling bearings including at least one angular contact bearing with two rolling bearings with angular contact
    • F16C19/543—Systems consisting of juxtaposed rolling bearings including at least one angular contact bearing with two rolling bearings with angular contact in O-arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/20—Land vehicles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2350/00—Machines or articles related to building
    • F16C2350/26—Excavators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7803—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings
    • F16C33/7813—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings for tapered roller bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7896—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members with two or more discrete sealings arranged in series

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Sealing Of Bearings (AREA)
  • Rolling Contact Bearings (AREA)
  • Sealing With Elastic Sealing Lips (AREA)

Abstract

本发明提供一种滚动轴承装置(11)，无需拆开检查或者向外部引出通信线等，在组装状态下就能够了解供油单元(13)是否正常动作。该滚动轴承装置由滚动轴承(11)与供油单元(13)的组合构成，供油单元(13)至少包括：润滑油箱(46)、从润滑油箱(46)吸引润滑油并从排出口排出润滑油的泵(45)、驱动泵(45)的驱动部(44)、向驱动部(44)提供电能的发电部(41)，所述供油单元(13)安装在滚动轴承(11)的固定环侧部件(12b)或者与滚动轴承相邻的间隔件(16)上，在供油单元内设置有将所述供油单元(23)的动作信息向外部发送的通信装置(49)。

Description

滚动轴承的密封装置
技术领域
本发明涉及将滚动轴承与油封形成为一体的滚动轴承的密封装置。
背景技术
在如图6所示的配备以液压挖掘机为代表的履带式移动装置2的建筑机械1的移动减速机的链轮部3的链轮用轴承中，如图7所示，以圆锥滚子轴承的内环4的小凸缘部相对的方式并列使用两个圆锥滚子轴承，并利用压板12进行轴向的定位，其中，该圆锥滚子轴承包括：内环4及外环5、设置在所述内外环间的多个滚动体6、保持滚动体6的保持体7。
该链轮用轴承是外环旋转，外环5固定于旋转侧的链轮外壳8，与链轮外壳8一体旋转。
另一方面，链轮用轴承的内环4固定于不旋转的固定侧的电机外壳9。
为了保持内部润滑剂以及防止沙土从外部侵入，链轮部具有密封功能。
目前，链轮用轴承的密封使用与轴承分体的浮动密封件件10(专利文献1)。
该浮动密封件件10利用两个橡胶部件10a的弹力使密封环10b接触，以保持内部润滑油。
现有技术文献
专利文献
专利文献1：日本特开昭59－93573号公报
发明内容
发明所要解决的课题
但是，在浮动密封件10中，在橡胶部件10a以及电机外壳9与链轮外壳8组装时，为了确保密封性，需要管理密封环10b的高度和斜度，组装性差。
由此，有可能发生内部润滑油的泄漏以及沙土从外部侵入，存在引起减速机部和轴承的润滑不良这样的问题。
另外，在将由内环、外环、滚动体、保持器、密封件形成为一体的构造的已有的带密封轴承用作链轮用轴承的情况下，对于沙土从外部的侵入，密封性不足。
带密封轴承的密封件使用密封板、油封、高填充密封(hi-packseal)、三唇密封等，由于内外环是非分离构造，因此难以组装及拆开。
因此，本发明在课题在于，提供一种组装及拆开容易，能够保持内部润滑剂以及防止沙土从外部侵入的滚动轴承的密封装置。
用于解决课题的技术手段
为了解决所述课题，本发明的滚动轴承的密封装置包括：固定在旋转侧的链轮外壳上的外环；固定在不旋转的固定侧的电机外壳上的内环；插设于该内外环间的多个滚动体；保持滚动体的保持器，其中，包括甩油环和密封唇的油封固定在内环上，油封的密封唇抵接在外环或者链轮外壳，由此密封内外环的轴承空间。
能够在所述链轮外壳的内径面设置套筒，在油封的径向上延伸的密封唇在该套筒滑动。
也可以在所述链轮外壳的端面固定侧板，在油封的轴向上延伸的密封唇在该侧板滑动。
也可以在所述内环的轴向的端部形成台阶部，在该台阶部与所述侧板的内径端部之间形成迷宫式密封。
也可以在所述侧板的表面粘接树脂制滑动部件，使内环与侧板接触。
所述侧板通过螺栓固定在链轮外壳的端面，由此能够进行侧板的定位。
也可以所述外环在轴向上延伸，在该延伸部中嵌入L形的套筒，在轴向上延伸的油封的密封唇在该套筒的圆形环部滑动，由此，省略所述侧板。
发明效果
根据本发明，如以上所述，将油封与内环形成为一体的部件，由此，组装以及拆开容易，能够保持内部润滑剂，防止沙土从外部侵入。
附图说明
图1是表示本发明的滚动轴承的密封装置的第一实施方式的部分断面图。
图2是图1的部分放大图。
图3是表示图1的滚动轴承的密封装置的组装步骤的断面图。
图4是表示本发明的滚动轴承的密封装置的第二实施方式的部分放大断面图。
图5是表示本发明的滚动轴承的密封装置的第三实施方式的部分放大断面图。
图6是表示履带式移动装置的例子的侧面图。
图7是表示现有的滚动轴承的密封装置的部分断面图。
具体实施方式
下面，根据附图说明本发明的实施方式。
图1及图2所示的实施方式的链轮用轴承中，按照圆锥滚子轴承的内环25的小凸缘部相对的方式并列使用两个圆锥滚子轴承，并利用压板24将两个圆锥滚子轴承在轴向上定位，该圆锥滚子轴承包括：内环25及外环26、插设于这些内外环间的多个滚动体27、保持滚动体27的保持器28，。
该链轮用轴承是外环旋转，外环26固定在旋转侧的链轮外壳29，与链轮外壳29一体地旋转。
另一方面，链轮用轴承的内环25固定在不旋转的固定侧的电机外壳30。
链轮用轴承组装在移动装置中时，为了能够分别组装内环25和外环26，需要内环25与外环26能够分离。因此，在本发明中，向外具有密封唇32的油封31固定在内环25的大凸缘外径上而形成为内环一体部件。通过采用与内环25为一体的部件，不需要定位管理等，组装性提高。
而且，为了确保外环26旋转中的密封性，将油封31的密封唇32的滑动面设置在旋转轮侧、链轮外壳29侧。
油封31包括固定在内环25的外径面的L字形的甩油环33和固定在该甩油环33的密封唇32。密封唇32包括在轴向上突出的侧唇32a和在径向的外侧突出的两个径向唇32b。
在链轮外壳29的内径面嵌合固定有圆环状的套筒35，防止因在径向外侧突出的两个径向唇32b的滑动所引起的链轮外壳29的磨损，防止内部润滑材料的泄漏。
在链轮外壳29的外侧端面用螺栓37固定有侧板34，密封唇32的侧唇32a在侧板34滑动。
侧板34在电机外壳30侧突出，侧板34的内径侧的端面与电机外壳30的外径面之间的间隙36形成迷宫式密封，确保沙土和泥水不会侵入到侧板34的内侧。
为了油封31的定位和固定，在内环25的外径面设置第1台阶部25a，在与侧板34的端面之间形成迷宫式密封的间隙36的部分设置第2台阶部25b。通过设置该第2台阶部25b，即使泥水侵入侧板34的内侧，泥水也容易沿着第2台阶部25b流出。
如果内环25的外径面带有台阶，则内环25的大凸缘的宽度缩小，由此产生的强度不足通过在第1台阶部25a嵌入油封31来解决。即，内环25与油封31采用一体构造，由此，能够确保满足内环25的大凸缘强度的内环宽度。
第2层由内环与侧板形成迷宫，由此防止外部沙土的侵入。另外，在轴承的组装工序中，第2层的台阶与侧板接触，从而防止内环部件落下以及侧唇过大变形。
在链轮外壳29的内径面嵌合固定圆环状的套筒35，将套筒35作为与油封31滑动的滑动部件，由此无需改善链轮外壳29内径面的表面粗糙度。但是，套筒35的滑动面的粗糙度为Ra0.1～0.6μm的研磨抛光。径向唇32b与套筒35并不直接接触，在两者之间存在油膜。根据径向唇32b附近的压力分布的变化，该油膜从内部润滑材料侧向外部(大气)侧、从外部侧向内部润滑材料侧循环，从而发挥密封效果，并且，避开滑动面上的径向唇32b与套筒35的接触，从而发挥防止径向唇32b磨损与烧接的作用。在Ra0.1～0.6μm的研磨抛光中，存在与轴向大体成直角的不连续的加工痕，处于内部的润滑油难以泄漏的状态。另外，在Ra0.1μm以下的精加工的情况下，加工痕与轴向斜交，粗糙度的谷部的部分从油封的内部至外部连续，因此，油沿着谷部向外部泄漏。另一方面，在超过Ra0.6μm的情况下，润滑油沿着粗糙度的深谷部向外部泄漏，这成为油膜变小，径向唇32b的滑动部的效果和烧接的原因。
另外，由于径向唇32b在其上滑动的部件磨损，因此，通过使用可更换的套筒35，能够防止链轮外壳29的磨损。
上述第1台阶部25a将油封31与内环25在轴向上定位固定，这样，即使在油封31被外部沙土挤压的情况下，也不会影响保持器28，维持侧板34与侧唇32a的过盈量。
图1及图2所示的实施方式的链轮用轴承，如以上所述，密封装置一体化，所以装置的密封性提高，并且密封装置的组装性也提高。
根据图3说明图1及图2所示的实施方式的链轮用轴承的组装步骤。
首先，如图3(a)所示，在链轮外壳29的内径面嵌入圆环状的套筒35和外环26。
接着，如图3(b)所示，将保持在保持器28的滚动体27和组装有油封31的内环25组装于外环26。
然后，如图3(c)所示，在链轮外壳29的端面用螺栓37固定侧板34，将密封唇32的侧唇32a压在侧板34上。
接着，在图3(c)所示的组装状态下，即使倒过来，也能够利用侧板34防止内环25落下，所以，将图3(c)所示的组装件倒过来，如图3(d)所示，将内环25组装在电机外壳30，完成链轮用轴承24的组装。
下面，图4所示的实施方式的一例链轮用轴承是一个例子，即，通过在侧板34的表面粘接树脂制滑动部件，使侧板34的内侧端部与内环25的第2台阶部25b接触，消除内环25与侧板34之间的间隙。
另外，图5所示的实施方式的链轮用轴承，使用于嵌入套筒35的外环26的宽度在轴向延伸，在该延伸部26a嵌入整合了侧板34功能的L形套筒35，使密封唇32的侧唇32a压在该L形套筒35的圆形环部35a，由此省略侧板34。
符号说明
24压板
25内环
25a第1台阶部
25b第2台阶部
26外环
26a延伸部
27滚动体
28保持器
29链轮外壳
30电机外壳
31油封
32密封唇
32a侧唇
32b径向唇
33甩油环
34侧板
35套筒
35a圆形环部
36间隙
37螺栓

Claims (7)

1.一种滚动轴承的密封装置，其特征在于，包括：
固定在旋转侧的链轮外壳上的外环；
固定在不旋转的固定侧的电机外壳上的内环；
插设在该内外环间的多个滚动体；和
保持滚动体的保持器，其中
包括甩油环和密封唇的油封固定在内环上，油封的密封唇抵接在外环或者链轮外壳，由此密封内外环的轴承空间。
2.如权利要求1所述的滚动轴承的密封装置，其特征在于：
在所述外环的内径面设置有套筒，在油封的径向上延伸的密封唇在该套筒滑动。
3.如权利要求1或2所述的滚动轴承的密封装置，其特征在于：
在所述链轮外壳的端面固定有侧板，在油封的轴向上延伸的密封唇在该侧板滑动。
4.如权利要求3所述的滚动轴承的密封装置，其特征在于：
在所述内环的轴向的端部形成台阶部，在该台阶部与所述侧板的内径端部之间形成迷宫式密封。
5.如权利要求3所述的滚动轴承的密封装置，其特征在于：
在所述侧板的表面粘接树脂制滑动件，使内环与侧板接触。
6.如权利要求3～5所述的滚动轴承的密封装置，其特征在于：
所述侧板通过螺栓固定在链轮外壳的端面。
7.如权利要求2所述的滚动轴承的密封装置，其特征在于：
所述外环在轴向上延伸，在该延伸部嵌入L形的套筒，在轴向上延伸的油封的密封唇在该套筒的圆形环部滑动。
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