JP3988010B2 - Slewing drive - Google Patents

Slewing drive Download PDF

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Publication number
JP3988010B2
JP3988010B2 JP23231699A JP23231699A JP3988010B2 JP 3988010 B2 JP3988010 B2 JP 3988010B2 JP 23231699 A JP23231699 A JP 23231699A JP 23231699 A JP23231699 A JP 23231699A JP 3988010 B2 JP3988010 B2 JP 3988010B2
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Japan
Prior art keywords
self
seal
aligning roller
bearing
output shaft
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JP23231699A
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Japanese (ja)
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JP2001059525A (en
Inventor
丈博 安達
俊員 川上
義明 堀内
浩義 伊藤
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JTEKT Corp
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JTEKT Corp
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    • 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
    • F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
    • F16C23/06—Ball or roller bearings
    • F16C23/08—Ball or roller bearings self-adjusting
    • F16C23/082—Ball or roller bearings self-adjusting by means of at least one substantially spherical surface
    • F16C23/086—Ball or roller bearings self-adjusting by means of at least one substantially spherical surface forming a track for rolling elements
    • 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
    • F16C33/7806—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 spherical 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
    • F16C33/7869—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
    • F16C33/7876—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 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
    • 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
    • F16C19/38—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 two or more rows of rollers

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Support Of The Bearing (AREA)
  • Sealing Of Bearings (AREA)
  • Rolling Contact Bearings (AREA)
  • Component Parts Of Construction Machinery (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、例えばミニ油圧ショベル等に用いられる旋回駆動装置に関する。
【０００２】
【従来の技術】
ミニ油圧ショベル等に用いられる旋回駆動装置は、一般に、油圧モータ等の駆動源の回転を遊星歯車減速機構によって減速するとともに、その減速機構はケーシングを旋回体に固定し、かつ、その出力軸にはピニオンギアを儲け、そのピニオンギアを車体側に固定配置されたリングギアに噛み合わせることによって、旋回体を旋回させる。
【０００３】
このような旋回駆動装置の要部構成例を図３に要部断面図で示す。この例においては、２段の遊星歯車機構が用いられ、図において３０は旋回体Ｔに固定されたケーシングであり、３１ａ，３１ｂは太陽歯車、３２ａ，３２ｂは各太陽歯車３１ａ，３１ｂに噛み合う遊星歯車、３３ａ，３３ｂはその各遊星歯車３２ａ，３２ｂをシャフト３３ｃ，３３ｄを介して支持するキャリア、３４ａ，３４ｂは各遊星歯車３２ａ，３２ｂに噛み合う内歯車であり、１段目の太陽歯車３１ａはキー溝嵌合等により駆動源の回転軸（入力軸）３５に連結される。また、２段目のキャリア３３ｂは、キー溝嵌合等により出力軸３６に連結されており、駆動源の回転軸３５の回転が減速されて出力軸３６に伝達される。そして、出力軸３６の下端部にはピニオンギア３７が設けられ、このピニオンギア３７が固定配置されたリングギア３８に噛み合っており、回転軸３５の駆動によりピニオンギア３７が回転して旋回体Ｔが旋回するようになっている。
【０００４】
出力軸３６はケーシング３０に対して上下２個の自動調心ころ軸受４１，４２を介して回転自在に支持されており、この２個の自動調心ころ軸受４１，４２間のスパンを比較的大きくすることによって、その下端に片持ち状に設けられたピニオンギア３７を介して出力軸３６の軸端に片方から作用するラジアル荷重Ｆに耐えるように考慮されている。
【０００５】
また、各自動調心ころ軸受４１，４２のうち、上側の軸受４１は遊星歯車機構と一体に潤滑されるのであるが、下側の軸受４２の潤滑は、ケーシング３０と出力軸３６の間に挿入された上側シール４２ａと、ケーシング３０の下端部に間座４２ｃと一体的に設けられた下側シール４２ｂの間にグリースＧを密封することによって行われている。
【０００６】
【発明が解決しようとする課題】
ところで、以上のような従来の旋回駆動装置用においては、下側の自動調心ころ軸受４２の潤滑用のグリースＧを密封するために、上側シール４２ａと下側シール４２ｂが必要となり、部品点数の増加および組み込み工数の増大の原因となっている。
【０００７】
本発明の目的は、このような旋回駆動装置における部品点数を削減し、装置の組立工数を削減してトータルコストを低減するとともに、装置の小型化をも達成することのできる旋回駆動装置を提供することにある。
【０００８】
【課題を解決するための手段】
上記の目的を達成するため、本発明の旋回駆動装置は、駆動源の回転を、旋回体にケーシングが固定された遊星歯車減速機構により減速し、その遊星歯車減速機構の鉛直の出力軸に固着されたピニオンギアをリングギアに噛み合わせることにより、上記旋回体を旋回させ、かつ、上記出力軸を上下２つの自動調心ころ軸受で支承する旋回駆動装置であって、上記上下２つの自動調心ころ軸受のうち、下方側に用いられる軸受の上方端面上にグリース溜まりを有し、上記下方側の軸受は、その内外輪のいずれか一方の軸方向両端のうちの下方側に調心性を備えたオイルシールが装着され、かつ、上方側が開放されて上記グリース溜まりと連通していることによって特徴づけられる。
【０００９】
本発明は、旋回駆動装置の遊星歯車減速機構の出力軸を支承する下側の自動調心ころ軸受に、装置への組込状態において下側となる端面側に、調心性を有するオイルシールを一体化することにより、所期の目的を達成しようとするものである。
【００１０】
すなわち、上記の出力軸を支承する上下の自動調心ころ軸受のうちの下側の自動調心ころ軸受には、その潤滑のためのグリースを封入する空間を形成すべく、従来、上下のシールが用いられているが、このうち、上側のシールについては、上下の自動調心ころ軸受間に相応のスパンが必要で、それが故にスペース的なゆとりがあるとともに、下側の自動調心ころ軸受のためのグリース量を確保する意味からも、軸受に対して離隔した位置に設けることが望ましいのであるが、下側のシールについては、これを当初から軸受に組み込んでユニット化することによって、軸受とは別に間座や下側シールを必要とすることなく、旋回駆動装置の部品点数を削減し、また、組立工数を削減することが可能となり、更には間座の不要化等によって軸方向寸法を削減し、装置の小型化にも寄与することができる。
【００１１】
ここで、本発明の自動調心ころ軸受に用いられるオイルシールは、軸受が調心性を有しているが故に調心性のあるものとされ、その具体的な構成としては、実公平４−２９１３０号に開示されている構成を好適に用いることができ、この構成の採用により、出力軸がその先端に片持ち状に設けられたピニオンギアを介してその軸端部に片方からラジアル荷重を受けることによって生じる内輪の軸偏心に対して有効に密封性を維持することができる。
【００１２】
【発明の実施の形態】
以下、図面を参照しつつ本発明の好適な実施の形態について説明する。
図１は本発明の実施の形態の主要構成要素である下側の自動調心ころ軸受の構成を示す軸平行断面図であり、図２は本発明の実施の形態の要部断面図である。
まず、本発明の実施の形態に組み込まれる下側の自動調心ころ軸受について説明すると、この自動調心ころ軸受は、内輪１と外輪２の間に転動体としての複数の球面ころ３が転動自在に配置されている。内輪１は複列の軌道面を有しているとともに、外輪２の軌道面は軸受中心を曲率中心とする球面の一部をなしている。各球面ころ３は、内輪１の各軌道面ごとに、それぞれ周方向等間隔に配置されるように保持器４ａ，４ｂによって保持されている。なお、５は浮き案内輪である。
【００１３】
この自動調心ころ軸受には、その一方の端面側にのみオイルシール６が取り付けられている。すなわち、内輪１の一端側には、オイルシール６の後述するシールリップが摺動接触するシール面１１が形成されており、このシール面１１は直円筒面である。また、外輪２の一端側には、オイルシール６を嵌め込むための嵌合溝２１が形成されている。
【００１４】
オイルシール６は、実公平４−２９１３０号に開示されているものと同等の構造を有し、金属製の芯金６１と、その芯金６１に一体化されたゴム製の弾性部材６２、およびガータスプリング６３を主体として構成されている。芯金６１は全体として環状でその断面形状が略Ｌ字形であり、その外径面が外輪２の嵌合溝２１の底面（内周面）に沿うように外輪２に対して装着される。
【００１５】
弾性部材６２は、シールリップ６２ａ，可撓部６２ｂおよびリップ腰部６２ｃを有し、シールリップ６２ａには内輪１のシール面１１に全周にわたって摺動接触する主リップＭとその内側でシール面１１に対して同じく全周にわたって摺動接触する補助リップＳが形成されており、主リップＭの外周側にガータスプリング６３が嵌着されている。可撓部６２ｂは、芯金６１とシールリップ６２ａの間に介在して、シールリップ６２ａの半径方向への変位を可能とするもので、芯金６１の内周から軸方向内側に向けて小径となる向きに傾斜し、その先端がリップ腰部６２ｃに繋がっている。リップ腰部６２ｃはシールリップ６２ａを補強する役割を担うものであり、その側面部には、比較的剛性の高い材料からなる補強リング６４が一体化されている。
【００１６】
以上のオイルシール６の構成によると、内輪１が嵌め込まれる軸の傾斜や偏心に起因して内輪１がその調心作用によって偏心したとき、可撓部６２ｂの半径方向への伸縮作用によってシールリップ６２ａがその偏心に追随して変位し、しかも、シールリップ６２ａはリップ腰部６３ｃの補強リング６４の存在によって略円形のまま変位するため、主リップＭは、内輪１のシール面１１に対する締め代以上の偏心時においても、当該シール面１１に対して全周にわたり略均一の接触パターンを保つことになる。従って、内輪１の大きな偏心ないしは傾斜に際してもその偏心に有効に追随し、自動調心ころ軸受の調心作用に対応して常に密封性を保つことができる。
【００１７】
さて、以上の自動調心ころ軸受は、図３に示した旋回駆動装置における遊星歯車減速機構の出力軸３６を支承する下側の自動調心ころ軸受４２として用いられ、オイルシール６の装着側端面が下側を向くように装置内に組み込まれる。すなわち、図２に示すように、上記した自動調心ころ軸受は、その内輪１が出力軸３６に圧入され、外輪２が遊星歯車減速機構のケーシング３０に嵌め込まれた状態で装置に組み込まれる。上側の自動調心ころ軸受４１は従来と同等のものが用いられている。また、下側の自動調心ころ軸受４２のグリース密封空間の上端を仕切る上側シール４２ａは従来と同等のものが用いられるが、従来の下側シール４２ｂおよび間座４２ｃは不要であって用いられていない。そして、下側の自動調心ころ軸受４２を潤滑するためのグリースＧは、上側シール４２ａと当該軸受４２の下端面に一体化されているオイルシール６によって仕切られた空間内に密封される。なお、図２の実施の形態においては、以上の特徴的構成をを除いては図３で示した構成と同等であり、図２では、同等の部材については図３と同じ符号を付している。
【００１８】
以上の本発明の実施の形態によると、旋回駆動装置を構成する部品点数が減少し、その組立工数を削減することができ、トータルコストを削減することが可能となる。しかも、上側シール４２ａは従来と同等としているため、下側の自動調心ころ軸受４２を潤滑するためのグリースＧの収容量は確保されるとともに、オイルシール６が高い偏心追随機能を有しているため、出力軸３６の端面に高いラジアル荷重が作用しても、密封性を維持することができる。また、下側シール４２ｂおよび間座４２ｃに代えて軸受４２に一体化されたオイルシール６を用いるため、装置の軸方向寸法（高さ）を小さくすることにも有効である。
【００１９】
【発明の効果】
本発明によれば、旋回駆動装置の遊星歯車減速機構の出力軸を支承する上下の自動調心ころ軸受のうちの下側の自動調心ころ軸受について、その下方側の端部に調心性（偏心追随性）を有するオイルシールを装着し、上方側の端部を開放しているので、当該下側の自動調心ころ軸受を潤滑するためのグリースの密封空間を形成すべく従来のこの種の装置において当該軸受の上下両側に組み込まれていたシールのうち下側のシールと、それと併せて用いられていた間座が不要となり、部品点数の削減とそれに伴う装置の組立工数の削減を達成することができるとともに、自動調心ころ軸受とオイルシールとのユニット化による装置の小型化を達成することができる。
【図面の簡単な説明】
【図１】 本発明の実施の形態における主要構成要素である下側の自動調心ころ軸受の軸平行断面図である。
【図２】 本発明の実施の形態の要部断面図である。
【図３】 従来の旋回駆動装置の要部断面図である。
【符号の説明】
１ 内輪
１１ シール面
２ 外輪
２１ 嵌合溝
３ 球面ころ
４ａ，４ｂ 保持器
５ 浮き案内輪
６ オイルシール
６１ 芯金
６２ 弾性部材
６２ａ シールリップ
６２ｂ 可撓部
６２ｃ リップ腰部
６３ ガータスプリング
６４ 補強リング
３０ 遊星歯車減速機構のケーシング
３６ 出力軸
３７ ピニオンギア
４１ 上側の自動調心ころ軸受
４２ 下側の自動調心ころ軸受
４２ａ 上側シール
４２ｂ 下側シール
Ｇ グリース[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a turning drive device used in, for example, a mini excavator.
[0002]
[Prior art]
A swing drive device used for a mini hydraulic excavator or the like generally decelerates the rotation of a drive source such as a hydraulic motor by a planetary gear speed reduction mechanism, and the speed reduction mechanism fixes a casing to the swing body and has an output shaft. Makes a pinion gear and turns the revolving body by meshing the pinion gear with a ring gear fixedly arranged on the vehicle body side.
[0003]
A configuration example of a main part of such a turning drive device is shown in a cross-sectional view of the main part in FIG. In this example, a two-stage planetary gear mechanism is used. In the figure, 30 is a casing fixed to the revolving body T, 31a and 31b are sun gears, 32a and 32b are planets meshing with the sun gears 31a and 31b. The gears 33a and 33b are carriers that support the planetary gears 32a and 32b via the shafts 33c and 33d, 34a and 34b are internal gears that mesh with the planetary gears 32a and 32b, and the first-stage sun gear 31a is It is connected to the rotation shaft (input shaft) 35 of the drive source by keyway fitting or the like. The second stage carrier 33b is connected to the output shaft 36 by keyway fitting or the like, and the rotation of the rotation shaft 35 of the drive source is decelerated and transmitted to the output shaft 36. A pinion gear 37 is provided at the lower end portion of the output shaft 36, and the pinion gear 37 meshes with a ring gear 38 that is fixedly arranged. Turns.
[0004]
The output shaft 36 is rotatably supported with respect to the casing 30 via two self-aligning roller bearings 41 and 42, and a span between the two self-aligning roller bearings 41 and 42 is relatively set. By enlarging, it is considered to withstand a radial load F acting on the shaft end of the output shaft 36 from one side via a pinion gear 37 provided in a cantilever shape at the lower end.
[0005]
Of the spherical roller bearings 41, 42, the upper bearing 41 is lubricated integrally with the planetary gear mechanism. The lower bearing 42 is lubricated between the casing 30 and the output shaft 36. Grease G is sealed between the inserted upper seal 42 a and the lower seal 42 b provided integrally with the spacer 42 c at the lower end of the casing 30.
[0006]
[Problems to be solved by the invention]
By the way, in the conventional swing drive device as described above, the upper seal 42a and the lower seal 42b are required to seal the lubricating grease G of the lower self-aligning roller bearing 42, and the number of parts is reduced. And increase in the number of assembly man-hours.
[0007]
An object of the present invention is to reduce the number of components in such a swing drive system, while reducing the total cost by reducing the number of steps of assembling the device, the swing drive equipment capable of achieving even the size of the apparatus It is to provide.
[0008]
[Means for Solving the Problems]
To achieve the above object, the turning drive equipment of the present invention, the rotation of the driving source, the casing is reduced by the planetary gear reduction mechanism fixed to the swing body, the vertical output shaft of the planetary gear reduction mechanism by engaging the anchored pinion gear to the ring gear, to pivot the pivot member, and a rotation driving equipment for supporting the output shaft at upper and lower two self-aligning roller bearings, the two upper and lower of the self-aligning roller bearing has a grease reservoir on the upper end face of the bearing used in the lower side, the lower side of the bearing is adjusted to the lower side of one of the axial ends of the inner and outer rings An oil seal having a centricity is attached , and the upper side is opened to communicate with the grease reservoir .
[0009]
The present invention provides a self-aligning roller bearing on the lower side that supports the output shaft of the planetary gear speed reduction mechanism of a turning drive device, and an oil seal having a centering property on the lower end surface side when assembled in the device. By uniting, it aims to achieve the intended purpose.
[0010]
In other words, the lower self-aligning roller bearing of the upper and lower self-aligning roller bearings that support the output shaft described above has conventionally been equipped with upper and lower seals so as to form a space for enclosing grease for lubrication thereof. Of these, the upper seal requires an appropriate span between the upper and lower self-aligning roller bearings, which provides space and lower self-aligning rollers. From the viewpoint of securing the amount of grease for the bearing, it is desirable to provide it at a position separated from the bearing, but for the lower seal, by incorporating it into the bearing from the beginning and unitizing it, Without the need for a spacer or lower seal separately from the bearing, it is possible to reduce the number of parts of the swivel drive device, reduce the number of assembly steps, and further eliminate the need for a spacer in the axial direction. Law reducing, can contribute to downsizing of the apparatus.
[0011]
Here, the oil seal used in the self-aligning roller bearing of the present invention is aligned because the bearing has alignment, and its specific configuration is as follows. The output shaft receives a radial load from one end at the end of the shaft through a pinion gear provided in a cantilevered manner at the tip of the output shaft. Therefore, the sealing performance can be effectively maintained against the axial eccentricity of the inner ring.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
1 Ri axially parallel sectional view showing the bottom of the self-aligning roller bearing-side configuration is a key component of the embodiment of the present invention, FIG. 2 is a fragmentary cross-sectional view of the embodiment of the present invention is there.
First, the lower self-aligning roller bearing incorporated in the embodiment of the present invention will be described. In this self-aligning roller bearing, a plurality of spherical rollers 3 as rolling elements are rolled between an inner ring 1 and an outer ring 2. Arranged freely. The inner ring 1 has a double-row raceway surface, and the raceway surface of the outer ring 2 forms a part of a spherical surface having a center of curvature at the bearing center. The spherical rollers 3 are held by cages 4a and 4b so as to be arranged at equal intervals in the circumferential direction for each raceway surface of the inner ring 1. Reference numeral 5 denotes a floating guide wheel.
[0013]
The self-aligning roller bearing is provided with an oil seal 6 only on one end face side thereof. That is, on one end side of the inner ring 1, a seal surface 11 on which a seal lip described later of the oil seal 6 comes into sliding contact is formed, and this seal surface 11 is a right cylindrical surface. A fitting groove 21 for fitting the oil seal 6 is formed on one end side of the outer ring 2.
[0014]
The oil seal 6 has a structure equivalent to that disclosed in Japanese Utility Model Publication No. 4-29130, and includes a metal core 61, a rubber elastic member 62 integrated with the core 61, and The garter spring 63 is mainly used. The metal core 61 is generally annular and has a substantially L-shaped cross section, and is attached to the outer ring 2 so that the outer diameter surface thereof is along the bottom surface (inner peripheral surface) of the fitting groove 21 of the outer ring 2.
[0015]
The elastic member 62 includes a seal lip 62a, a flexible portion 62b, and a lip waist portion 62c. The seal lip 62a has a main lip M that is in sliding contact with the seal surface 11 of the inner ring 1 over the entire circumference, and the seal surface 11 inside the main lip M. On the other hand, an auxiliary lip S that is slidably contacted over the entire circumference is formed, and a garter spring 63 is fitted on the outer circumferential side of the main lip M. The flexible portion 62b is interposed between the cored bar 61 and the seal lip 62a and allows the seal lip 62a to be displaced in the radial direction. The flexible part 62b has a small diameter from the inner periphery of the cored bar 61 toward the inner side in the axial direction. The tip is connected to the lip waist 62c. The lip waist portion 62c serves to reinforce the seal lip 62a, and a reinforcing ring 64 made of a material having a relatively high rigidity is integrated on a side surface portion thereof.
[0016]
According to the configuration of the oil seal 6 described above, when the inner ring 1 is decentered by the alignment action due to the inclination or eccentricity of the shaft into which the inner ring 1 is fitted, the seal lip is caused by the expansion and contraction action in the radial direction of the flexible portion 62b. 62a is displaced following the eccentricity, and the seal lip 62a is displaced in a substantially circular shape due to the presence of the reinforcing ring 64 of the lip waist portion 63c. Therefore, the main lip M is more than the tightening allowance for the seal surface 11 of the inner ring 1 even when the eccentricity, thus keeping the contact pattern of substantially uniform Ri cotton the entire circumference with respect to the seal surface 11. Therefore, even when the inner ring 1 has a large eccentricity or inclination, the eccentricity can be effectively followed and the sealing performance can always be maintained corresponding to the aligning action of the self-aligning roller bearing.
[0017]
The above self-aligning roller bearing is used as the lower self-aligning roller bearing 42 that supports the output shaft 36 of the planetary gear reduction mechanism in the turning drive device shown in FIG. It is installed in the apparatus so that the end face faces downward. That is, as shown in FIG. 2 , the self-aligning roller bearing described above is incorporated into the apparatus in a state where the inner ring 1 is press-fitted into the output shaft 36 and the outer ring 2 is fitted into the casing 30 of the planetary gear reduction mechanism. The upper self-aligning roller bearing 41 is equivalent to the conventional one. Further, the upper seal 42a for partitioning the upper end of the grease sealed space of the lower self-aligning roller bearing 42 is the same as the conventional one, but the conventional lower seal 42b and the spacer 42c are unnecessary and used. Not. Then, the grease G for lubricating the spherical roller bearing 42 at the lower side is sealed within a partitioned by oil seals 6 are integrated under end face of the upper seal 42a and the bearing 42 space. 2 is the same as the configuration shown in FIG. 3 except for the above-described characteristic configuration. In FIG. 2, the same members as those in FIG. Yes.
[0018]
According to the embodiment of the present invention described above, the number of parts constituting the turning drive device is reduced, the number of assembling steps can be reduced, and the total cost can be reduced. In addition, since the upper seal 42a is the same as the conventional one, the accommodation amount of the grease G for lubricating the lower self-aligning roller bearing 42 is ensured, and the oil seal 6 has a high eccentricity tracking function. Therefore, even if a high radial load acts on the end surface of the output shaft 36, the sealing performance can be maintained. Further, since the oil seal 6 integrated with the bearing 42 is used instead of the lower seal 42b and the spacer 42c, it is effective to reduce the axial dimension (height) of the apparatus.
[0019]
【The invention's effect】
According to the present invention, with the lower self-aligning roller bearing of the upper and lower self-aligning roller bearing for supporting the output shaft of the planetary gear reduction mechanism of the swing drive system, aligning capability in the end portion of its lower side Since an oil seal having (eccentricity following property) is mounted and the upper end is opened, the conventional sealing space for grease for lubricating the lower self-aligning roller bearing is formed. Of the seals installed on both the upper and lower sides of the bearings, the lower seal and the spacer used in conjunction with it are not required, reducing the number of parts and the number of assembly steps for the device. In addition to achieving this, it is possible to achieve downsizing of the apparatus by unitizing a self-aligning roller bearing and an oil seal.
[Brief description of the drawings]
FIG. 1 is an axial parallel cross-sectional view of a lower self-aligning roller bearing which is a main component in an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a main part of the embodiment of the present invention.
FIG. 3 is a cross-sectional view of a main part of a conventional turning drive device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inner ring 11 Seal surface 2 Outer ring 21 Fitting groove 3 Spherical roller 4a, 4b Cage 5 Floating guide ring 6 Oil seal 61 Core metal 62 Elastic member 62a Seal lip 62b Flexible part 62c Lip waist part 63 Garter spring 64 Reinforcement ring 30 Planet Gear reduction mechanism casing 36 Output shaft 37 Pinion gear 41 Upper self-aligning roller bearing 42 Lower self-aligning roller bearing 42a Upper seal 42b Lower seal G Grease

Claims (1)

駆動源の回転を、旋回体にケーシングが固定された遊星歯車減速機構により減速し、その遊星歯車減速機構の鉛直の出力軸に固着されたピニオンギアをリングギアに噛み合わせることにより、上記旋回体を旋回させ、かつ、上記出力軸を上下２つの自動調心ころ軸受で支承する旋回駆動装置であって、
上記上下２つの自動調心ころ軸受のうち、下方側に用いられる軸受の上方端面上にグリース溜まりを有し、上記下方側の軸受は、その内外輪のいずれか一方の軸方向両端のうちの下方側に調心性を備えたオイルシールが装着され、かつ、上方側が開放されて上記グリース溜まりと連通していることを特徴とする旋回駆動装置。 The rotation of the drive source is reduced by a planetary gear speed reduction mechanism having a casing fixed to the rotation body, and the pinion gear fixed to the vertical output shaft of the planetary gear reduction mechanism is engaged with the ring gear, whereby the above rotation body pivots the, and a turning drive equipment for supporting the output shaft at upper and lower two self-aligning roller bearings,
Of the upper and lower self-aligning roller bearing has a grease reservoir on the upper end face of the bearing used in the lower side, the lower side of the bearing, of one of the axial ends of the inner and outer rings It mounted oil seal with the aligning capability downward and swing drive equipment which upper side is opened, characterized in that in communication with reservoir above grease.
JP23231699A 1999-08-19 1999-08-19 Slewing drive Expired - Fee Related JP3988010B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23231699A JP3988010B2 (en) 1999-08-19 1999-08-19 Slewing drive

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JP3988010B2 true JP3988010B2 (en) 2007-10-10

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JP5370087B2 (en) * 2009-11-04 2013-12-18 セイコーエプソン株式会社 Electrophoretic display device driving method, electrophoretic display device, and electronic apparatus
JP2013174359A (en) * 2013-04-30 2013-09-05 Nsk Ltd Rolling bearing with sealing device
JP2015021590A (en) * 2013-07-22 2015-02-02 日本精工株式会社 Seal device for rolling bearing and rolling bearing
WO2017154935A1 (en) * 2016-03-07 2017-09-14 日本精工株式会社 Rolling bearing, bearing unit for air turbine, and air turbine handpiece for dental use
US20210040991A1 (en) 2019-08-09 2021-02-11 Amsted Rail Company, Inc. Roller Bearing Seal Case
CN111022584A (en) * 2019-12-18 2020-04-17 国营第一二三厂 Gear box steering mechanism with floating intermediate wheel
CN112855764A (en) * 2021-02-23 2021-05-28 山东鑫开特轴承有限公司 Self-aligning roller bearing with dustproof structure and use method thereof
CN113217548A (en) * 2021-06-21 2021-08-06 江西泰豪军工集团有限公司 Novel rotating electrical machine bearing sealing device

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