JP2008215589A - Rolling bearing device - Google Patents

Rolling bearing device Download PDF

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Publication number
JP2008215589A
JP2008215589A JP2007057990A JP2007057990A JP2008215589A JP 2008215589 A JP2008215589 A JP 2008215589A JP 2007057990 A JP2007057990 A JP 2007057990A JP 2007057990 A JP2007057990 A JP 2007057990A JP 2008215589 A JP2008215589 A JP 2008215589A
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housing
outer ring
screw plate
end surface
rolling bearing
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Kazuhisa Toda
一寿 戸田
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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
    • 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

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Support Of The Bearing (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device in which a preload is properly adjusted according to a variation in temperature. <P>SOLUTION: This rolling bearing device comprises a detection means 20 in which a spiral screw plate 18 disposed coaxially with an outer ring 15 having one surface 18a in contact with the inner end surface 13a of the housing 13 and the other surface 18b on which spiral threads 18c are formed and wedge members 19 having a tilted surface 19a in line contact with the outer ring and a surface 19b brought into contact with the other surface of the spiral screw plate 18 and extending in the radial direction are interposed between the axial one end surface 15b of the outer ring 15 of the rolling bearing 11 and the inner end surface 13a of the housing 13 opposed to the one end surface and which is installed in the housing 13 and detects the thermal expansion of the housing 13; a drive means 22 for rotating the spiral screw plate 18 in the circumferential direction; and a control means 21 for controlling the drive means 22 according to the signal detected by the detection means 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

この発明は、円錐ころ軸受、アンギュラ玉軸受等の予圧をかけて使用する転がり軸受を組み込んだ転がり軸受装置に関する。   The present invention relates to a rolling bearing device incorporating a rolling bearing to be used with preload such as a tapered roller bearing and an angular ball bearing.

自動車等の車両に使用されるギヤ式駆動伝達ユニット、例えばトランスミッションユニットでは、回転軸をハウジングの内周に２つの円錐ころ軸受を介して支持している。
近年、軽量化のために鉄系金属に替えて軽合金（例えば、アルミニウム合金、マグネシウム合金等）で前記ハウジングを形成することが行われているが、回転軸は、強度や剛性の関係から鉄系金属で製作されるのが一般的である。
回転軸の支持に用いられる円錐ころ軸受に予圧が付与されている場合、ハウジングと回転軸との線膨張係数の差が大きいため、運転中にトランスミッションユニットの温度が上昇すると、回転軸に比べてハウジングの寸法変化が大きくなることから、転がり軸受に付与された予圧が低下し、これにより予圧が抜けてしまうという問題が発生する。 In a gear-type drive transmission unit used in a vehicle such as an automobile, for example, a transmission unit, a rotating shaft is supported on the inner periphery of a housing via two tapered roller bearings.
In recent years, in order to reduce the weight, the housing is formed of a light alloy (for example, an aluminum alloy, a magnesium alloy, etc.) instead of an iron-based metal. It is generally made of a base metal.
When preload is applied to the tapered roller bearing used to support the rotating shaft, the difference in linear expansion coefficient between the housing and the rotating shaft is large. Since the dimensional change of the housing becomes large, the preload applied to the rolling bearing is lowered, thereby causing a problem that the preload is released.

このような予圧抜けを防止するため、ベアリングホルダ部（ハウジング）と円錐ころ軸受の端部との間に形状記憶合金製のスラストワッシャを介装することが提案されている（特許文献１参照）。
実開平５−６２５０号公報 In order to prevent such preload loss, it has been proposed to insert a shape memory alloy thrust washer between the bearing holder (housing) and the end of the tapered roller bearing (see Patent Document 1). .
Japanese Utility Model Publication No. 5-6250

特許文献１のスラストワッシャを用いれば、熱膨張率の相違によるギヤシャフト長の変位量とハウジング長の変位量の差がスラストワッシャの変形により相殺され、冷間時と熱間時との双方で適正な予圧を円錐ころ軸受に付与することができる。しかし、このスラストワッシャは形状記憶合金製であり、熱間時（８０℃以上）にならないとテーパ状に変化しないため、温度変化に応じて予圧を適正に調整することができなかった。
本発明はこのような事情に鑑みてなされたものであり、温度変化に応じて予圧を適正に調整することができる転がり軸受装置を提供することを目的としている。 If the thrust washer of Patent Document 1 is used, the difference between the displacement amount of the gear shaft length and the housing length due to the difference in coefficient of thermal expansion is offset by the deformation of the thrust washer, both in the cold time and in the hot time. Appropriate preload can be applied to the tapered roller bearing. However, since this thrust washer is made of a shape memory alloy and does not change in a taper shape unless it is hot (80 ° C. or higher), the preload cannot be adjusted appropriately according to the temperature change.
This invention is made | formed in view of such a situation, and it aims at providing the rolling bearing apparatus which can adjust a preload appropriately according to a temperature change.

本発明の転がり軸受装置は、金属製の回転体が、当該金属より線膨張係数の大きい金属からなるハウジングの内周に複数の転がり軸受を介して支持され、当該複数の転がり軸受に予圧が付与されている転がり軸受装置であって、前記転がり軸受の外輪の軸方向一方側の端面とこれに対向する前記ハウジングの内端面との間、又は前記転がり軸受の内輪の軸方向他方側の端面とこれに対向する前記回転体の段部との間に、前記外輪又は内輪と同軸に配設されており、前記ハウジングの内端面又は前記回転体の段部に接触する一方の面と螺旋状のネジ山及びネジ溝の少なくとも一方が設けられた他方の面とを有する螺旋ネジ板と、前記外輪又は内輪に線接触し、当該外輪又は内輪の軸心に垂直な面に対して傾斜する傾斜面と前記ネジ山が挿入される溝及び前記ネジ溝に挿入される凸部の少なくとも一方を有し前記螺旋ネジ板の他方の面と接触する径方向に延びる面とを有する複数のクサビ部材とが介装されているとともに、前記ハウジングに設けられ且つ当該ハウジングの熱膨張を検出する検出手段と、前記螺旋ネジ板を周方向に回転させる駆動手段と、前記検出手段の検出信号に基づいて前記駆動手段を制御する制御手段とを備えていることを特徴としている。   In the rolling bearing device of the present invention, a metal rotating body is supported on the inner periphery of a housing made of a metal having a larger linear expansion coefficient than the metal via a plurality of rolling bearings, and preload is applied to the plurality of rolling bearings. A rolling bearing device that is provided between an end face on one axial side of the outer ring of the rolling bearing and an inner end face of the housing opposite to the end face, or an end face on the other axial side of the inner ring of the rolling bearing; Between the step of the rotating body facing this, the outer ring or the inner ring is disposed coaxially, and the inner end surface of the housing or one surface contacting the step of the rotating body is spirally formed. A spiral screw plate having at least one of a screw thread and a screw groove, and an inclined surface which is in line contact with the outer ring or inner ring and is inclined with respect to a plane perpendicular to the axis of the outer ring or inner ring And the thread is inserted A plurality of wedge members having at least one of a groove and a convex portion inserted into the screw groove and having a radially extending surface in contact with the other surface of the spiral screw plate, Detection means provided in the housing and detecting thermal expansion of the housing, driving means for rotating the helical screw plate in the circumferential direction, and control means for controlling the driving means based on a detection signal of the detection means It is characterized by having.

本発明の転がり軸受装置によれば、温度変化によるハウジングの熱膨張が検出手段で検出されると、その検出信号に基づいて制御手段が駆動手段を制御して螺旋ネジ板を周方向に回転させ、この回転によりクサビ部材が径方向に移動する。このとき、クサビ部材の傾斜面と外輪又は内輪との接触位置が移動するので外輪又は内輪を軸方向に移動させることができる。これにより、温度変化に応じて予圧を適正に調整することができる。   According to the rolling bearing device of the present invention, when the thermal expansion of the housing due to a temperature change is detected by the detection means, the control means controls the drive means based on the detection signal to rotate the spiral screw plate in the circumferential direction. The wedge member moves in the radial direction by this rotation. At this time, since the contact position between the inclined surface of the wedge member and the outer ring or the inner ring moves, the outer ring or the inner ring can be moved in the axial direction. Thereby, a preload can be appropriately adjusted according to a temperature change.

本発明の転がり軸受装置によれば、温度変化に応じて予圧を適正に調整することができる。   According to the rolling bearing device of the present invention, it is possible to appropriately adjust the preload according to the temperature change.

以下、本発明の第１実施形態を添付図面に基づいて詳細に説明する。なお、以下においては、本発明の転がり軸受装置を自動車のトランスミッションに適用した場合を例示して説明する。
図１は、本発明の第１実施形態に係る転がり軸受装置を適用したトランスミッション１の横断面説明図である。トランスミッション１は、ケース２と、このケース２の内部に組み込まれたギヤボックス３と、このギヤボックス３を貫通するように互いに平行に設けられた回転体である入力軸４及び出力軸５とを備えている。入力軸４及び出力軸５は鉄系金属（鋼）製であり、ギヤボックス３内に設けられた変速ギヤ６により連動して回転するように構成されている。 Hereinafter, a first embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following, a case where the rolling bearing device of the present invention is applied to an automobile transmission will be described as an example.
FIG. 1 is a cross-sectional explanatory view of a transmission 1 to which a rolling bearing device according to a first embodiment of the present invention is applied. The transmission 1 includes a case 2, a gear box 3 incorporated in the case 2, and an input shaft 4 and an output shaft 5 that are rotating bodies provided in parallel with each other so as to penetrate the gear box 3. I have. The input shaft 4 and the output shaft 5 are made of ferrous metal (steel), and are configured to rotate in conjunction with a transmission gear 6 provided in the gear box 3.

変速ギヤ６は、マニュアルタイプであり、入力軸４に互いに歯数の異なる複数枚の入力ギヤ７を設けるとともに、出力軸５に互いに歯数の異なる出力ギヤ８を設け、得るべき変速比又は前進／後退の区別に応じて、入力軸４上の入力ギヤ７と出力軸５上の出力ギヤ８との噛み合いの組み合わせを切り替えることによって変速可能となっている。これら入力ギヤ７及び出力ギヤ８にはスパーギヤやヘリカルギヤが用いられる。なお、変速ギヤ６は、遊星ギヤ機構等を用いたオートマチックタイプであってもよい。   The transmission gear 6 is a manual type, and the input shaft 4 is provided with a plurality of input gears 7 having different numbers of teeth, and the output shaft 5 is provided with output gears 8 having different numbers of teeth, so that the speed ratio to be obtained or forward The speed can be changed by switching the combination of meshing between the input gear 7 on the input shaft 4 and the output gear 8 on the output shaft 5 according to the distinction of the reverse. For the input gear 7 and the output gear 8, a spur gear or a helical gear is used. The transmission gear 6 may be an automatic type using a planetary gear mechanism or the like.

入力軸４の両端は、ケース２内の内側に固定された円筒ころ軸受９及び玉軸受１０によりそれぞれ回転可能に支持されている。出力軸５の両端は、一対の転がり軸受である円錐ころ軸受１１，１２によりそれぞれ支持されている。軸方向一方側（図１において左側）の円錐ころ軸受１１は、ケース２と一体のハウジングとしての軸受ハウジング１３に嵌合されており、軸方向他方側（右側）の円錐ころ軸受１２は、ケース１２と一体の軸受ハウジング１４に当て止め固定されている。双方の円錐ころ軸受１１，１２には、定位置予圧方式によって予圧が付与されている。なお、ケース２、軸受ハウジング１３，１４は、軽量化のためにアルミニウム合金にて形成されている。   Both ends of the input shaft 4 are rotatably supported by cylindrical roller bearings 9 and ball bearings 10 fixed inside the case 2. Both ends of the output shaft 5 are respectively supported by tapered roller bearings 11 and 12 which are a pair of rolling bearings. A tapered roller bearing 11 on one axial side (left side in FIG. 1) is fitted into a bearing housing 13 as a housing integral with the case 2, and a tapered roller bearing 12 on the other axial side (right side) 12 is fixed to a bearing housing 14 integral with the bearing 12. Both tapered roller bearings 11 and 12 are preloaded by a fixed position preload system. The case 2 and the bearing housings 13 and 14 are made of an aluminum alloy for weight reduction.

図２は、図１に示されるトランスミッション１の要部の拡大断面説明図である。左側の円錐ころ軸受１１は、外輪１５と、内輪１６と、これら外輪１５及び内輪１６の間に転動自在に配設された複数の転動体として円錐ころ１７とを備えている。外輪１５の外周面は、軸受ハウジング１３の内周面に嵌合され、外輪１５の内周面には、円錐ころ１７が斜接して転動する内周軌道面１５ａが形成されている。一方、内輪１６の外周面には、円錐ころ１７が斜接して転動する外周軌道面１６ａが形成され、当該内輪１６の内周面には出力軸５が嵌合されている。内輪１６と円錐ころ１７との接触角および円錐ころ１７と外輪１５との接触角は、軸方向内側（右側）から軸方向外側（左側）に向けて拡径するように設定されている。なお、ここで接触角は、ＪＩＳＢ０１０４−１９９１に規定された呼び接触角に準じる。
これらの構成は、右側の円錐ころ軸受１２（図１）についても、軸方向内側が左側に、軸方向外側が右側になる点以外は同様であるため、その説明を省略する。 FIG. 2 is an enlarged cross-sectional explanatory view of a main part of the transmission 1 shown in FIG. The left tapered roller bearing 11 includes an outer ring 15, an inner ring 16, and a plurality of tapered rollers 17 as a plurality of rolling elements disposed between the outer ring 15 and the inner ring 16 so as to be able to roll. The outer peripheral surface of the outer ring 15 is fitted to the inner peripheral surface of the bearing housing 13, and an inner peripheral raceway surface 15 a is formed on the inner peripheral surface of the outer ring 15. On the other hand, on the outer peripheral surface of the inner ring 16, an outer peripheral raceway surface 16 a on which the tapered roller 17 rolls obliquely is formed, and the output shaft 5 is fitted on the inner peripheral surface of the inner ring 16. The contact angle between the inner ring 16 and the tapered roller 17 and the contact angle between the tapered roller 17 and the outer ring 15 are set so as to increase in diameter from the axially inner side (right side) toward the axially outer side (left side). Here, the contact angle conforms to the nominal contact angle defined in JIS B0104-1991.
These configurations are the same for the right tapered roller bearing 12 (FIG. 1) except that the inner side in the axial direction is on the left side and the outer side in the axial direction is on the right side.

外輪１５の軸方向外側（図２において左側）の端面１５ｂと、この端面１５ｂに対向する軸受ハウジング１３の内端面１３ａとの間には、螺旋ネジ板１８及び複数（ここでは４個）のクサビ部材１９が介装されている。螺旋ネジ板１８は軸受ハウジング１３の内周面に回転摺動可能に保持される。
図３は、螺旋ネジ板１８とクサビ部材１９との位置関係を示す説明図である。螺旋ネジ板１８は、外輪１５と同軸に配設されており、断面矩形のリング状に形成されている。螺旋ネジ板１８の一方の面１８ａは軸受ハウジング１３の内端面１３ａと回転摺動可能に接触しており、他方の面１８ｂには螺旋状のネジ山１８ｃが設けられている。 Between the end surface 15b on the outer side in the axial direction of the outer ring 15 (left side in FIG. 2) and the inner end surface 13a of the bearing housing 13 facing the end surface 15b, a spiral screw plate 18 and a plurality of (here, four) wedges are provided. A member 19 is interposed. The helical screw plate 18 is held on the inner peripheral surface of the bearing housing 13 so as to be able to rotate and slide.
FIG. 3 is an explanatory diagram showing the positional relationship between the helical screw plate 18 and the wedge member 19. The spiral screw plate 18 is disposed coaxially with the outer ring 15 and is formed in a ring shape having a rectangular cross section. One surface 18a of the spiral screw plate 18 is in contact with the inner end surface 13a of the bearing housing 13 so as to be able to rotate and slide, and a spiral thread 18c is provided on the other surface 18b.

４個のクサビ部材１９は周方向において等間隔に配置されており、それぞれ断面が直角三角形をしている。クサビ部材１９の傾斜面１９ａは、外輪１５の軸心に垂直な面に対して傾斜しており、外輪１５の軸方向外側（左側）の角部１５ｃと線接触している。そして、径方向に延びる面１９ｂには、螺旋ネジ板１８のネジ山１８ｃに対応する溝１９ｃが形成されており、この溝１９ｃにネジ山１８ｃを挿入した状態で、クサビ部材１９の径方向に延びる面１９ｂの径方向外方側の一部と螺旋ネジ板１８の他方の面１８ｂの径方向内方側の一部とが接触している。クサビ部材１９と螺旋ネジ板１８とが接触する部分には潤滑剤が塗布されており、クサビ部材１９は螺旋ネジ板１８上を滑らかに移動できるようになっている。４個のクサビ部材１９のそれぞれ周方向両側には軸受ハウジング１３に固定された規制部材２３があり、クサビ部材１９の周方向への移動を規制し、クサビ部材１９が主として径方向に動くよう保持している。   The four wedge members 19 are arranged at equal intervals in the circumferential direction, and each section has a right triangle. The inclined surface 19 a of the wedge member 19 is inclined with respect to a surface perpendicular to the axis of the outer ring 15, and is in line contact with the corner 15 c on the outer side (left side) in the axial direction of the outer ring 15. A groove 19c corresponding to the thread 18c of the spiral screw plate 18 is formed on the surface 19b extending in the radial direction, and the thread member 18c is inserted into the groove 19c in the radial direction of the wedge member 19. A part on the radially outer side of the extending surface 19b and a part on the radially inner side of the other surface 18b of the spiral screw plate 18 are in contact with each other. A lubricant is applied to a portion where the wedge member 19 and the spiral screw plate 18 are in contact with each other, and the wedge member 19 can move smoothly on the spiral screw plate 18. There are restricting members 23 fixed to the bearing housing 13 on both sides in the circumferential direction of the four wedge members 19 to restrict the movement of the wedge members 19 in the circumferential direction and hold the wedge members 19 so as to move mainly in the radial direction. is doing.

トランスミッション１はさらに、軸受ハウジング１３に設けられ且つ軸受ハウジング１３の熱膨張を検出する検出手段２０と、螺旋ネジ板１８を周方向に回転させる駆動手段２２と、検出手段２０の検出信号に基づいて前記駆動手段２２の駆動を制御する制御手段２１とを備えている。
検出手段２０は、軸受ハウジング１３の熱膨張に関する情報を検出し、検出した情報を制御手段２１に送信可能なものであり、本実施の形態では温度センサが用いられている。 The transmission 1 is further based on detection means 20 provided in the bearing housing 13 for detecting thermal expansion of the bearing housing 13, drive means 22 for rotating the helical screw plate 18 in the circumferential direction, and detection signals from the detection means 20. And a control means 21 for controlling the drive of the drive means 22.
The detection means 20 is capable of detecting information related to thermal expansion of the bearing housing 13 and transmitting the detected information to the control means 21. In the present embodiment, a temperature sensor is used.

制御手段２１の記憶部には、検出手段である温度センサ２０によって検出された温度情報から軸受ハウジング１３の熱膨張（変位量）及び予圧の変動量を求める演算式が記憶されており、この制御手段２１によって温度センサ２０の情報に基づいた予圧の変動量が求められる。そして、得られた予圧の変動量に応じて駆動手段２２の駆動を制御する。
駆動手段２２は、螺旋ネジ板１８を周方向に回転させるものであり、本実施の形態ではでは、図３に示すように、螺旋ネジ板１８の円筒面１８ｄに切り欠き部を設け、そこに駆動手段である油圧ピストン２２を当接させている。この油圧ピストン２２は、制御手段２１からの指示信号に従って調整された油圧で螺旋ネジ板１８を押し、螺旋ネジ板１８を周方向に回転させる。 The storage unit of the control unit 21 stores an arithmetic expression for obtaining the thermal expansion (displacement amount) and the preload variation amount of the bearing housing 13 from the temperature information detected by the temperature sensor 20 as the detection unit. The means 21 obtains the fluctuation amount of the preload based on the information of the temperature sensor 20. And the drive of the drive means 22 is controlled according to the fluctuation amount of the obtained preload.
The driving means 22 rotates the spiral screw plate 18 in the circumferential direction. In the present embodiment, as shown in FIG. 3, a notch is provided on the cylindrical surface 18d of the spiral screw plate 18, and there is provided there. The hydraulic piston 22 which is a driving means is brought into contact. The hydraulic piston 22 pushes the helical screw plate 18 with the hydraulic pressure adjusted according to the instruction signal from the control means 21, and rotates the helical screw plate 18 in the circumferential direction.

次に、第１実施形態に係るトランスミッション１の動作を説明する。
エンジンが始動して運転状態になると、ギヤシャフト間の噛み合い摩擦やギヤオイルの攪拌等によりトランスミッション１の温度は徐々に上昇する。すると、出力軸５と軸受ハウジング１３との線膨張係数の違いにより、出力軸５より軸受ハウジング１３の方が大きく膨張するため、予め設定されていた予圧が変化することになる。ところが、温度センサ２０で検出された温度情報が制御手段２１に送られると、そこで予圧の変動量が求められ、その予圧の変動量に応じて油圧ピストン２２の油圧が制御される。すると油圧ピストン２２は調整された油圧で螺旋ネジ板１８を押し（図３の矢印ｐ参照）、螺旋ネジ板１８は反時計回りに回転し（図３の矢印ｑ参照）、クサビ部材１９は規制部材２３によって周方向への移動を規制されながら径方向外方に移動する（図３の矢印ｒ参照）。このとき、外輪１５の角部１５ｃが接触するクサビ部材１９の傾斜面１９ａの位置が移動して外輪１５が軸方向（内輪側）に移動する。これにより予圧を適正に調整することができる。なお、エンジンが停止すると、油圧ピストン２２及び螺旋ネジ板１８は元の位置に戻るように設定されている。 Next, the operation of the transmission 1 according to the first embodiment will be described.
When the engine starts and is in an operating state, the temperature of the transmission 1 gradually increases due to meshing friction between gear shafts, stirring of gear oil, and the like. Then, due to the difference in the linear expansion coefficient between the output shaft 5 and the bearing housing 13, the bearing housing 13 expands more than the output shaft 5, and the preset preload changes. However, when the temperature information detected by the temperature sensor 20 is sent to the control means 21, the amount of fluctuation of the preload is obtained there, and the oil pressure of the hydraulic piston 22 is controlled according to the amount of fluctuation of the preload. Then, the hydraulic piston 22 pushes the spiral screw plate 18 with the adjusted hydraulic pressure (see arrow p in FIG. 3), the spiral screw plate 18 rotates counterclockwise (see arrow q in FIG. 3), and the wedge member 19 is regulated. The member 23 moves radially outward while being restricted from moving in the circumferential direction (see arrow r in FIG. 3). At this time, the position of the inclined surface 19a of the wedge member 19 with which the corner 15c of the outer ring 15 contacts moves, and the outer ring 15 moves in the axial direction (inner ring side). Thereby, a preload can be adjusted appropriately. When the engine is stopped, the hydraulic piston 22 and the helical screw plate 18 are set to return to their original positions.

このように、本発明の転がり軸受装置であるトランスミッション１によれば、温度変化による軸受ハウジング１３の熱膨張が検出手段である温度センサ２０で検出されると、その検出信号に基づいて制御手段２１が駆動手段である油圧ピストン２２を制御して螺旋ネジ板１８を周方向に回転させ、この回転によりクサビ部材１９が径方向に移動する。このとき、クサビ部材１９の傾斜面１９ａと外輪１５又は内輪１６との接触位置が移動するので外輪１５又は内輪１６を軸方向に移動させることができる。これにより、温度変化に応じて予圧を適正に調整することができる。   Thus, according to the transmission 1 that is the rolling bearing device of the present invention, when the thermal expansion of the bearing housing 13 due to the temperature change is detected by the temperature sensor 20 that is the detection means, the control means 21 is based on the detection signal. Controls the hydraulic piston 22 which is a driving means to rotate the helical screw plate 18 in the circumferential direction, and the rotation moves the wedge member 19 in the radial direction. At this time, since the contact position of the inclined surface 19a of the wedge member 19 and the outer ring 15 or the inner ring 16 moves, the outer ring 15 or the inner ring 16 can be moved in the axial direction. Thereby, a preload can be appropriately adjusted according to a temperature change.

次に、本発明の第２実施形態を説明する。図４は、本発明の第２実施形態に係るトランスミッション１の要部の拡大断面説明図である。
本発明の第２実施形態に係るトランスミッション１においては、螺旋ネジ板１８及びクサビ部材１９が内輪１６の軸方向内側（図４において右側）の端面１６ｂと、この端面１６ｂに対向する出力軸５の段部５ａとの間に介装されている。螺旋ネジ板１８は出力軸５の外周面に回転摺動可能に保持される。これ以外は、上述した第１実施形態と同様であり、その説明を省略する。 Next, a second embodiment of the present invention will be described. FIG. 4 is an enlarged cross-sectional explanatory view of a main part of the transmission 1 according to the second embodiment of the present invention.
In the transmission 1 according to the second embodiment of the present invention, the spiral screw plate 18 and the wedge member 19 are provided on the end surface 16b on the inner side in the axial direction of the inner ring 16 (right side in FIG. 4) and the output shaft 5 facing the end surface 16b. It is interposed between the stepped portions 5a. The spiral screw plate 18 is held on the outer peripheral surface of the output shaft 5 so as to be able to rotate and slide. Other than this, the second embodiment is the same as the first embodiment described above, and a description thereof is omitted.

図５は、図４の螺旋ネジ板１８とクサビ部材１９との位置関係を示す説明図である。螺旋ネジ板１８の一方の面１８ａは出力軸５の段部５ａと接触しており、他方の面１８ｂには螺旋状のネジ山１８ｃが設けられている。
４個のクサビ部材１９は周方向において等間隔に配置されており、その傾斜面１９ａは内輪１６の軸方向内側（右側）の角部１６ｃと線接触している。そして、径方向に延びる面１９ｂには、螺旋ネジ板１８のネジ山１８ｃに対応する溝１９ｃが形成されており、この溝１９ｃにネジ山１８ｃを挿入した状態で、クサビ部材１９の径方向に延びる面１９ｂの径方向内方側の一部と螺旋ネジ板１８の他方の面１８ｂの径方向外方側の一部とが接触している。クサビ部材１９と螺旋ネジ板１８とが接触する部分には潤滑剤が塗布されており、クサビ部材１９は螺旋ネジ板１８上を滑らかに移動できるようになっている。４個のクサビ部材１９のそれぞれ周方向両側には出力軸５に固定された規制部材２４があり、クサビ部材１９の周方向への移動を規制し、クサビ部材１９が主として径方向に動くよう保持している。 FIG. 5 is an explanatory diagram showing the positional relationship between the helical screw plate 18 and the wedge member 19 of FIG. One surface 18a of the spiral screw plate 18 is in contact with the stepped portion 5a of the output shaft 5, and a spiral thread 18c is provided on the other surface 18b.
The four wedge members 19 are arranged at equal intervals in the circumferential direction, and the inclined surfaces 19 a are in line contact with the corners 16 c on the inner side (right side) of the inner ring 16 in the axial direction. A groove 19c corresponding to the thread 18c of the spiral screw plate 18 is formed on the surface 19b extending in the radial direction, and the thread member 18c is inserted into the groove 19c in the radial direction of the wedge member 19. A part on the radially inner side of the extending surface 19b is in contact with a part on the radially outer side of the other face 18b of the spiral screw plate 18. A lubricant is applied to a portion where the wedge member 19 and the spiral screw plate 18 are in contact with each other, and the wedge member 19 can move smoothly on the spiral screw plate 18. There are restricting members 24 fixed to the output shaft 5 on both sides in the circumferential direction of the four wedge members 19, restricting the movement of the wedge members 19 in the circumferential direction and holding the wedge members 19 so as to move mainly in the radial direction. is doing.

第２実施形態に係るトランスミッション１の動作を説明する。エンジンが始動して運転状態になると、トランスミッション１の温度は徐々に上昇する。すると、出力軸５より軸受ハウジング１３の方が大きく膨張するため、予め設定されていた予圧が変化することになる。ところが、温度センサ２０で検出された温度情報が制御手段２１に送られると、そこで予圧の変動量が求められ、その予圧の変動量に応じて油圧ピストン２２の油圧が制御される。すると油圧ピストン２２は調整された油圧で螺旋ネジ板１８を押し（図５の矢印ｓ参照）、螺旋ネジ板１８は時計回りに回転し（図５の矢印ｔ参照）、クサビ部材１９は径方向内方に移動する（図５の矢印ｕ参照）。このとき、内輪１６の角部１６ｃが接触するクサビ部材１９の傾斜面１９ａの位置が移動して内輪１６が軸方向（外輪側）に移動する。これにより予圧を適正に調整することができる。   An operation of the transmission 1 according to the second embodiment will be described. When the engine starts and enters an operating state, the temperature of the transmission 1 gradually increases. Then, since the bearing housing 13 expands more than the output shaft 5, the preset preload changes. However, when the temperature information detected by the temperature sensor 20 is sent to the control means 21, the amount of fluctuation of the preload is obtained there, and the oil pressure of the hydraulic piston 22 is controlled according to the amount of fluctuation of the preload. Then, the hydraulic piston 22 pushes the spiral screw plate 18 with the adjusted hydraulic pressure (see arrow s in FIG. 5), the spiral screw plate 18 rotates clockwise (see arrow t in FIG. 5), and the wedge member 19 is in the radial direction. Move inward (see arrow u in FIG. 5). At this time, the position of the inclined surface 19a of the wedge member 19 with which the corner portion 16c of the inner ring 16 contacts moves, and the inner ring 16 moves in the axial direction (outer ring side). Thereby, a preload can be adjusted appropriately.

本発明は、上記実施形態に限定されることなく適宜変更することが可能である。上記実施形態においては、螺旋ネジ板１８にネジ山１８ｃを形成し、クサビ部材１９にネジ山１８ｃに対応する溝１９ｃを形成したが、螺旋ネジ板１８にネジ溝を形成し、クサビ部材１９にネジ溝に対応する凸部を形成してもよく、或いは両方を形成してもよい。また、上記実施形態においては、規制部材２３，２４はそれぞれ軸受ハウジング１３、出力軸５に固定されていたが、一体に形成してもよく、また、それぞれ軸受ハウジング１３に固定される部材、出力軸５に固定される部材に固定又は一体に形成してもよく、また軸受ハウジング１３と外輪１５とが回り止めされている場合又は出力軸５と内輪１６とが回り止めされている場合においては、外輪１５、内輪１６に固定又は一体に形成してもよい。上記実施形態においてはクサビ部材１９の数を４個にして説明したが、クサビ部材１９は４個に限定されず、複数であればいくつでもかまわない。また、上記実施形態においては、検出手段として温度センサ２０を用いているが、軸受ハウジング１３の熱膨張に関する情報を検出できればよく、歪みセンサ等を用いることも可能である。さらに、駆動手段として油圧ピストン２２を用いているが、螺旋ネジ板１８を周方向に回転させるものであれば油圧ピストン２２に限定されない。例えば、螺旋ネジ板１８の周りにコイルを巻き、このコイルに対向するように永久磁石を配置して、コイルに電流を流すことにより得られる誘導起電力を利用して、螺旋ネジ板１８を周方向に回転させることも可能である。   The present invention is not limited to the above embodiment and can be modified as appropriate. In the above embodiment, the screw thread 18 c is formed on the spiral screw plate 18, and the groove 19 c corresponding to the screw thread 18 c is formed on the wedge member 19, but the screw groove is formed on the spiral screw plate 18 and the wedge member 19 is formed. A convex portion corresponding to the thread groove may be formed, or both may be formed. In the above embodiment, the regulating members 23 and 24 are fixed to the bearing housing 13 and the output shaft 5, respectively. However, the regulating members 23 and 24 may be integrally formed. When the bearing housing 13 and the outer ring 15 are prevented from rotating or when the output shaft 5 and the inner ring 16 are prevented from rotating, they may be fixed to or integrally formed with the member fixed to the shaft 5. The outer ring 15 and the inner ring 16 may be fixed or integrally formed. In the embodiment described above, the number of wedge members 19 is four, but the number of wedge members 19 is not limited to four, and any number of wedge members 19 may be used. Moreover, in the said embodiment, although the temperature sensor 20 is used as a detection means, the information regarding the thermal expansion of the bearing housing 13 should just be detected, and a distortion sensor etc. can also be used. Furthermore, although the hydraulic piston 22 is used as the drive means, the hydraulic piston 22 is not limited to the hydraulic piston 22 as long as the spiral screw plate 18 is rotated in the circumferential direction. For example, a coil is wound around the spiral screw plate 18, a permanent magnet is disposed so as to face the coil, and an induced electromotive force obtained by passing a current through the coil is used to surround the spiral screw plate 18. It is also possible to rotate in the direction.

上記実施形態では、トランスミッションに用いられる転がり軸受装置を示しているが、四輪駆動車の駆動分配軸用のギヤユニット等、他の装置にも適用することができる。転がり軸受としては、円錐ころ軸受に限らずアンギュラ玉軸受、深溝玉軸受等の予圧を使用する他の転がり軸受を使用してもよい。また、ハウジングをアルミニウム合金で形成しているが、回転体を形成する金属より線膨張係数の大きい金属であればよく、他の軽合金、例えばマグネシウム合金で形成してもよい。   Although the rolling bearing device used for the transmission is shown in the above embodiment, the present invention can be applied to other devices such as a gear unit for a drive distribution shaft of a four-wheel drive vehicle. The rolling bearing is not limited to the tapered roller bearing, and other rolling bearings using a preload such as an angular ball bearing or a deep groove ball bearing may be used. Moreover, although the housing is formed of an aluminum alloy, it may be a metal having a larger linear expansion coefficient than the metal forming the rotating body, and may be formed of another light alloy, such as a magnesium alloy.

本発明の第１実施形態に係る転がり軸受装置であるトランスミッションの横断面説明図である。It is a cross-sectional explanatory drawing of the transmission which is a rolling bearing apparatus which concerns on 1st Embodiment of this invention. 図１に示されるトランスミッションの要部の拡大断面説明図である。FIG. 2 is an enlarged cross-sectional explanatory view of a main part of the transmission shown in FIG. 1. 図１の螺旋ネジ板とクサビ部材との位置関係を示す模式説明図である。It is a schematic explanatory drawing which shows the positional relationship of the helical screw board of FIG. 1, and a wedge member. 本発明の第２実施形態に係るトランスミッションの要部の拡大断面説明図である。It is an expanded sectional explanatory view of the important section of the transmission concerning a 2nd embodiment of the present invention. 図４の螺旋ネジ板とクサビ部材との位置関係を示す模式説明図である。It is a schematic explanatory drawing which shows the positional relationship of the spiral screw board of FIG. 4, and a wedge member.

符号の説明Explanation of symbols

１ トランスミッション（転がり軸受装置）
５ 出力軸（回転体）
１１ 円錐ころ軸受（転がり軸受）
１３ 軸受ハウジング（ハウジング）
１５ 外輪
１６ 内輪
１８ 螺旋ネジ板
１９ クサビ部材
２０ 温度センサ（検出手段）
２１ 制御手段
２２ 油圧ピストン（駆動手段） 1 Transmission (Rolling bearing device)
5 Output shaft (rotating body)
11 Tapered roller bearings (rolling bearings)
13 Bearing housing (housing)
DESCRIPTION OF SYMBOLS 15 Outer ring 16 Inner ring 18 Spiral screw board 19 Wedge member 20 Temperature sensor (detection means)
21 Control means 22 Hydraulic piston (drive means)

Claims (1)

金属製の回転体が、当該金属より線膨張係数の大きい金属からなるハウジングの内周に複数の転がり軸受を介して支持され、当該複数の転がり軸受に予圧が付与されている転がり軸受装置であって、
前記転がり軸受の外輪の軸方向一方側の端面とこれに対向する前記ハウジングの内端面との間、又は前記転がり軸受の内輪の軸方向他方側の端面とこれに対向する前記回転体の段部との間に、前記外輪又は内輪と同軸に配設されており、前記ハウジングの内端面又は前記回転体の段部に接触する一方の面と螺旋状のネジ山及びネジ溝の少なくとも一方が設けられた他方の面とを有する螺旋ネジ板と、前記外輪又は内輪に線接触し、当該外輪又は内輪の軸心に垂直な面に対して傾斜する傾斜面と前記ネジ山が挿入される溝及び前記ネジ溝に挿入される凸部の少なくとも一方を有し前記螺旋ネジ板の他方の面と接触する径方向に延びる面とを有する複数のクサビ部材とが介装されているとともに、前記ハウジングに設けられ且つ当該ハウジングの熱膨張を検出する検出手段と、前記螺旋ネジ板を周方向に回転させる駆動手段と、前記検出手段の検出信号に基づいて前記駆動手段を制御する制御手段とを備えていることを特徴とする転がり軸受装置。 A rolling bearing device in which a metal rotating body is supported on the inner periphery of a housing made of a metal having a larger linear expansion coefficient than the metal via a plurality of rolling bearings, and preload is applied to the plurality of rolling bearings. And
Between the end surface on one axial side of the outer ring of the rolling bearing and the inner end surface of the housing facing it, or on the other end surface in the axial direction of the inner ring of the rolling bearing and the step portion of the rotating body facing the end surface Between the outer ring and the inner ring, and provided with at least one of an inner end surface of the housing or one surface contacting the stepped portion of the rotating body, and a spiral screw thread or screw groove. A spiral screw plate having the other surface, a slant surface that is in line contact with the outer ring or the inner ring and is inclined with respect to a plane perpendicular to the axis of the outer ring or the inner ring, and a groove into which the thread is inserted. A plurality of wedge members having at least one of convex portions inserted into the screw grooves and having a radially extending surface in contact with the other surface of the helical screw plate are interposed, and the housing Of the housing A rolling device comprising: detecting means for detecting expansion; driving means for rotating the spiral screw plate in a circumferential direction; and control means for controlling the driving means based on a detection signal of the detecting means. Bearing device.
JP2007057990A 2007-03-08 2007-03-08 Rolling bearing device Pending JP2008215589A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3423724A4 (en) * 2016-03-01 2019-10-16 The Timken Company Apparatus and method for preloading bearing assemblies

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3423724A4 (en) * 2016-03-01 2019-10-16 The Timken Company Apparatus and method for preloading bearing assemblies
US10794421B2 (en) 2016-03-01 2020-10-06 The Timken Company Apparatus and method for preloading bearing assemblies

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