JP5625474B2 - Bi-splitting rolling bearing and bearing device having the same - Google Patents

Bi-splitting rolling bearing and bearing device having the same Download PDF

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JP5625474B2
JP5625474B2 JP2010112408A JP2010112408A JP5625474B2 JP 5625474 B2 JP5625474 B2 JP 5625474B2 JP 2010112408 A JP2010112408 A JP 2010112408A JP 2010112408 A JP2010112408 A JP 2010112408A JP 5625474 B2 JP5625474 B2 JP 5625474B2
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cage
bearing
inclined surface
outer ring
split
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JP2011241862A (en
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村田　順司
順司 村田
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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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/46—Cages for rollers or needles
    • F16C33/51—Cages for rollers or needles formed of unconnected members
    • F16C33/513—Cages for rollers or needles formed of unconnected members formed of arcuate segments for carrying one or more rollers
    • F16C33/516—Cages for rollers or needles formed of unconnected members formed of arcuate segments for carrying one or more rollers with two segments, e.g. double-split cages with two semicircular parts
    • 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
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
    • F16C33/6659—Details of supply of the liquid to the bearing, e.g. passages or nozzles
    • 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
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
    • F16C33/6681—Details of distribution or circulation inside the bearing, e.g. grooves on the cage or passages in the 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
    • 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
    • F16C19/44—Needle bearings
    • F16C19/46—Needle bearings with one row or needles
    • F16C19/466—Needle bearings with one row or needles comprising needle rollers and an outer ring, i.e. subunit without inner 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
    • F16C9/00—Bearings for crankshafts or connecting-rods; Attachment of connecting-rods
    • F16C9/02—Crankshaft bearings

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Rolling Contact Bearings (AREA)

Description

本発明は、二つ割り転がり軸受及びこれを備えた軸受装置に関する。   The present invention relates to a split bearing and a bearing device including the same.

自動車や船舶などのエンジンにおいて、ピストンの往復動を回転運動に変換するクランクシャフトを支持する支持軸受は、カウンターウェイト間又はカウンターウェイトとコンロッド大端部との間に配置されることから、円周方向に二分割された分割軸受が使用されている。   In engines such as automobiles and ships, the support bearing that supports the crankshaft that converts the reciprocating motion of the piston into rotational motion is arranged between the counterweights or between the counterweight and the connecting rod large end, A split bearing divided in two in the direction is used.

前記支持軸受としては、従来、回転損失の大きい滑り軸受が使用されている。しかし、近年、より燃料消費量の少ないエンジンに対する要求が益々高まっていることから、回転損失を低減させるために、前記滑り軸受に代えて周方向に二分割された転がり軸受を使用することが提案されている（例えば、特許文献１参照）。   Conventionally, a sliding bearing having a large rotational loss is used as the support bearing. However, in recent years, the demand for an engine with less fuel consumption has been increasing, so in order to reduce the rotation loss, it has been proposed to use a rolling bearing divided into two in the circumferential direction instead of the sliding bearing. (For example, refer to Patent Document 1).

この分割型の転がり軸受は、例えば、円周方向に二つ割りにされた外輪と、両外輪の各内周の軌道面を転動する複数個の転動体と、各転動体を円周方向略等間隔に保持する保持器とを備えている。そして、クランクシャフトのジャーナル部が内輪部材として転がり軸受に内嵌されている。保持器は、その外周面が外輪の内周面に摺接することで、回転が案内される。また、上記転がり軸受は、外輪において径方向に貫通形成された給油孔から軸受内部に潤滑油が供給されるようになっている。   This split type rolling bearing includes, for example, an outer ring divided in two in the circumferential direction, a plurality of rolling elements that roll on the inner raceway surface of both outer rings, and each rolling element substantially in the circumferential direction. And a retainer for holding at intervals. The journal portion of the crankshaft is fitted into the rolling bearing as an inner ring member. The retainer is guided in rotation by the outer peripheral surface thereof being in sliding contact with the inner peripheral surface of the outer ring. Further, the rolling bearing is configured such that lubricating oil is supplied into the bearing from an oil supply hole formed in the outer ring so as to penetrate in the radial direction.

特開２００６−２３４０７４号公報JP 2006-234074 A

上記転がり軸受にあっては、軸受内部に供給する潤滑油によって軸受トルクが増大するのを抑制するために、潤滑油の供給量を大幅に減少させる傾向にある。しかし、この場合、クランクシャフトを高速回転させると、上記給油孔から供給された潤滑油は、保持器の回転に伴う遠心力により給油孔に沿って径方向外側へ押し戻され、軸受内部へ十分に導入されない場合がある。この場合、潤滑不足によって軸受温度が急激に上昇し、軸受に焼き付きが生じ易くなって、二つ割り転がり軸受の耐久性が低下するという問題が生じるおそれがある。
本発明は、前記問題点に鑑みてなされたものであり、潤滑油の供給量が少量であっても、軸受の耐久性が低下するのを抑制することができる二つ割り転がり軸受及びこれを備えた軸受装置を提供することを目的とする。 In the above rolling bearing, in order to suppress an increase in bearing torque due to the lubricating oil supplied to the inside of the bearing, the supply amount of the lubricating oil tends to be greatly reduced. However, in this case, when the crankshaft is rotated at a high speed, the lubricating oil supplied from the oil supply hole is pushed back radially outward along the oil supply hole due to the centrifugal force associated with the rotation of the cage, and sufficiently enters the bearing. May not be introduced. In this case, the bearing temperature rapidly increases due to insufficient lubrication, and the bearing tends to be seized, which may cause a problem that the durability of the split roller bearing is lowered.
The present invention has been made in view of the above problems, and includes a two-rolling bearing capable of suppressing a decrease in the durability of the bearing even when the amount of lubricating oil supplied is small, and the same. An object is to provide a bearing device.

前記目的を達成するための本発明の二つ割り転がり軸受は、径方向に貫通する給油孔を有し、円周方向に二つ割りにされた外輪と、前記外輪の内周の軌道面を転動する複数個の転動体と、円周上の少なくとも１箇所で分断され、前記転動体を円周方向に沿って所定間隔に保持する保持器とを備え、シャフトが内嵌されるとともに、前記外輪によって前記保持器の回転が案内される二つ割り転がり軸受であって、前記保持器には、径方向外側から径方向内側に向かうに従って前記保持器の回転方向に対して漸次逆方向に傾斜して、前記給油孔から供給される潤滑油を前記保持器の回転により径方向内側に掻き込む傾斜面が形成されており、前記傾斜面が、前記保持器の円周方向両分断面の少なくとも一方の分断面に形成されていることを特徴とする。 In order to achieve the above object, the split bearing according to the present invention has an oil supply hole that penetrates in a radial direction, and a plurality of outer rings that are split in the circumferential direction, and a plurality of rollers that roll on the inner raceway surface of the outer ring. Each of the rolling elements, and a cage that is divided at at least one location on the circumference and holds the rolling elements at a predetermined interval along the circumferential direction. The split roller bearing for guiding the rotation of the cage, wherein the cage is gradually inclined in the reverse direction with respect to the rotation direction of the cage from the radially outer side toward the radially inner side, An inclined surface is formed by scraping the lubricating oil supplied from the hole radially inward by rotation of the cage, and the inclined surface is at least one of the circumferentially divided sections of the cage. and characterized in that it is formed That.

この構成によれば、径方向外側から径方向内側に向かうに従って保持器の回転方向に対して漸次逆方向に傾斜する保持器の傾斜面により、外輪の給油孔から供給される潤滑油を、保持器の回転により径方向内側に掻き込んで軸受内部へ導くことができる。これにより、潤滑油の供給量が少量であっても、潤滑不足により軸受に焼き付きが生じるのを抑制することができるため、二つ割り転がり軸受の耐久性を向上することができる。   According to this configuration, the lubricating oil supplied from the oil supply hole of the outer ring is held by the inclined surface of the cage that gradually inclines in the opposite direction to the rotation direction of the cage as it goes from the radially outer side to the radially inner side. By rotating the device, it can be squeezed radially inward and guided into the bearing. Thereby, even if the supply amount of the lubricating oil is small, it is possible to suppress seizure of the bearing due to insufficient lubrication, and therefore it is possible to improve the durability of the double split bearing.

そして、前記傾斜面は、前記保持器の円周方向両分断面の少なくとも一方の分断面に形成されているので、傾斜面を形成することに起因して保持器の強度が低下するのを抑制することができる。 Then, the inclined surface is so formed on at least one of the partial cross-section of the circumferential cut in two cross-section of the cage, prevent the strength of the cage due to the formation of the inclined surface decreases can do.

また、前記傾斜面は、前記分断面の軸方向全長に亘って形成されていることが好ましい。この構成によれば、傾斜面により潤滑油を効率良く掻き込むことができる。   Moreover, it is preferable that the said inclined surface is formed over the axial direction full length of the said dividing surface. According to this configuration, the lubricating oil can be scraped efficiently by the inclined surface.

本発明の軸受装置は、前述した二つ割り転がり軸受と、この二つ割り転がり軸受を密接して支持する支持孔を有するハウジングと、を備えたことを特徴としている。
本発明の軸受装置では、前述した二つ割り転がり軸受を用いているので、潤滑油の供給量が少量であっても、軸受内部の潤滑不足により軸受に焼き付きが生じるのを抑制することができる。これにより、軸受装置の耐久性を向上することができる。 The bearing device of the present invention is characterized by comprising the above-mentioned two-rolling bearing and a housing having a support hole for closely supporting the two-rolling bearing.
In the bearing device of the present invention, since the above-described split roller bearing is used, it is possible to suppress the occurrence of seizure in the bearing due to insufficient lubrication inside the bearing even if the amount of lubricating oil supplied is small. Thereby, the durability of the bearing device can be improved.

本発明によれば、潤滑油の供給量が少量であっても、潤滑不足により軸受に焼き付きが生じるのを抑制することができるため、二つ割り転がり軸受の耐久性を向上することができる。   According to the present invention, even if the supply amount of the lubricating oil is small, it is possible to suppress the seizure of the bearing due to insufficient lubrication, and therefore it is possible to improve the durability of the double split bearing.

本発明の第１の実施形態に係る二つ割り転がり軸受及びこれを用いた軸受装置を示す断面図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a double split bearing according to a first embodiment of the present invention and a bearing device using the same. 図１のＡ−Ａ断面図である。It is AA sectional drawing of FIG. 図１の要部拡大図である。It is a principal part enlarged view of FIG. 本発明の第２の実施形態に係る二つ割り転がり軸受及びこれを用いた軸受装置を示す断面図である。It is sectional drawing which shows the bifurcated rolling bearing which concerns on the 2nd Embodiment of this invention, and a bearing apparatus using the same. 図４のＢ−Ｂ断面図である。It is BB sectional drawing of FIG. 図４の要部拡大図である。It is a principal part enlarged view of FIG.

以下、図面を参照しつつ、本発明の二つ割り転がり軸受及びこれを用いた軸受装置の実施形態を詳細に説明する。
図１は本発明の第１の実施形態に係る二つ割り転がり軸受及びこれを用いた軸受装置を示す断面図である。この軸受装置は、クランクシャフト支持用の軸受装置であり、クランクシャフト支持部２０の一部であるハウジング２１を備えている。このハウジング２１は、アッパーブロック２２とロアブロック２３とにより構成され、アッパーブロック２２の下面とロアブロック２３の上面とにより支持孔２４が形成されている。なお、アッパーブロック２２とロアブロック２３とは一対の固定ボルト２５により一体化されている。アッパーブロック２２には、二つ割り転がり軸受１に潤滑油を供給するための供給路２６がアッパーブロック２２の上面２２ａから支持孔２４に向けて貫通形成されている。 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a bi-rolling bearing and a bearing device using the same according to the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing a two-rolled bearing and a bearing device using the same according to a first embodiment of the present invention. This bearing device is a bearing device for supporting a crankshaft, and includes a housing 21 that is a part of the crankshaft support portion 20. The housing 21 includes an upper block 22 and a lower block 23, and a support hole 24 is formed by the lower surface of the upper block 22 and the upper surface of the lower block 23. The upper block 22 and the lower block 23 are integrated by a pair of fixing bolts 25. In the upper block 22, a supply passage 26 for supplying lubricating oil to the double split bearing 1 is formed so as to penetrate from the upper surface 22 a of the upper block 22 toward the support hole 24.

ハウジング２１の支持孔２４には、本発明の一実施形態に係る二つ割り転がり軸受１の外輪２が密嵌されている。この二つ割り転がり軸受１は、円周方向に二つ割りにされた前記外輪２と、外輪２の内周の軌道面１１を転動する複数個の転動体であるころ３と、円周上の２箇所で分断された保持器４とを備えている。クランクシャフトのジャーナル部であるシャフト５は、二つ割り転がり軸受１の前記複数個のころ３で囲まれる部分に内嵌されることにより当該転がり軸受１に回転自在に支持されている。このシャフト５は、二つ割り転がり軸受１の内輪部材としても機能している。   In the support hole 24 of the housing 21, the outer ring 2 of the two-rolled bearing 1 according to one embodiment of the present invention is closely fitted. The two-way split bearing 1 includes the outer ring 2 divided into two in the circumferential direction, a plurality of rolling elements 3 that roll on the inner raceway surface 11 of the outer ring 2, and two locations on the circumference. And the retainer 4 divided by. A shaft 5 that is a journal portion of the crankshaft is rotatably supported by the rolling bearing 1 by being fitted in a portion surrounded by the plurality of rollers 3 of the split roller bearing 1. The shaft 5 also functions as an inner ring member of the split split bearing 1.

外輪２は、半円筒状に形成された二つの半割外輪２ａ，２ｂからなり、半割外輪２ａの円周方向の端面と、この端面に対向する半割外輪２ｂの円周方向の端面とにより合わせ面６が構成されている。   The outer ring 2 includes two half outer rings 2a and 2b formed in a semi-cylindrical shape, and includes a circumferential end face of the half outer ring 2a and a circumferential end face of the half outer ring 2b facing the end face. Thus, the mating surface 6 is configured.

図２は図１のＡ−Ａ断面図である。半割外輪２ａ，２ｂの内周面には、その軸方向中央部においてころ３が転動する前記軌道面１１と、軌道面１１の軸方向両側において径方向内方に突出する一対の鍔部１２とが一体的に形成されている。半割外輪２ａの軸方向中間部には、前記供給路２６に供給された潤滑油を軸受内部へ供給するために、半割外輪２ａの外周面から内周面である軌道面１１に向かって径方向に貫通する給油孔１３が形成されている。なお、給油孔１３は、半割外輪２ｂ又は前記合わせ面６に形成されていてもよい。   2 is a cross-sectional view taken along the line AA in FIG. On the inner peripheral surfaces of the half outer rings 2a and 2b, the raceway surface 11 on which the roller 3 rolls in the axial center portion, and a pair of flanges projecting radially inward on both axial sides of the raceway surface 11 12 are integrally formed. In the axially intermediate portion of the half outer ring 2a, in order to supply the lubricating oil supplied to the supply passage 26 to the inside of the bearing, the outer peripheral surface of the half outer ring 2a is directed toward the raceway surface 11 which is the inner peripheral surface. An oil supply hole 13 penetrating in the radial direction is formed. The oil supply hole 13 may be formed in the half outer ring 2 b or the mating surface 6.

図１において、保持器４は、各ころ３を円周方向略等間隔に保持するものであり、半円状の一対の半割保持器４ａ，４ｂからなっている。半割保持器４ａの円周方向の端面（分断面）４ａ１，４ａ２と、この各端面４ａ１，４ａ２に対向する半割保持器４ｂの端面（分断面）４ｂ２，４ｂ１との間には、隙間Ｓ１，Ｓ２が形成されている。   In FIG. 1, the cage 4 holds the rollers 3 at substantially equal intervals in the circumferential direction, and is composed of a pair of semicircular halves 4a and 4b. There is a gap between the circumferential end faces (divided sections) 4a1 and 4a2 of the half cage 4a and the end faces (divided sections) 4b2 and 4b1 of the half cage 4b opposed to the end faces 4a1 and 4a2. S1 and S2 are formed.

図３は図１の要部拡大図である。半割保持器４ａの円周方向両端面４ａ１，４ａ２のうち当該半割保持器４ａの回転方向（矢印ａ方向）前方に位置する端面４ａ１は、給油孔１３から供給される潤滑油を径方向内側に掻き込む傾斜面１４とされている。この傾斜面１４は、半割保持器４ａの径方向外側から径方向内側に向かうに従って、半割保持器４ａの回転方向に対して漸次逆方向に傾斜している。傾斜面１４の傾斜角度θ１は、保持器４の軸心Ｃ１と傾斜面１４の内周端Ｐ１とを結ぶ仮想線Ｘ１に対して１５〜６５度に設定されている。   FIG. 3 is an enlarged view of a main part of FIG. Out of the circumferential end faces 4a1 and 4a2 of the half cage 4a, the end surface 4a1 located in front of the half cage 4a in the rotational direction (arrow a direction) is a radial direction for lubricating oil supplied from the oil supply hole 13 The inclined surface 14 is raked inward. The inclined surface 14 is gradually inclined in the opposite direction with respect to the rotation direction of the half cage 4a as it goes from the radially outer side to the radially inner side of the half cage 4a. The inclination angle θ1 of the inclined surface 14 is set to 15 to 65 degrees with respect to an imaginary line X1 connecting the axis C1 of the cage 4 and the inner peripheral end P1 of the inclined surface 14.

図１において、半割保持器４ｂの円周方向両端面４ｂ１，４ｂ２のうち当該半割保持器４ｂの回転方向（矢印ａ方向）前方に位置する端面４ｂ１は、半割保持器４ｂの端面４ａ１と同様に傾斜面１４とされている。各傾斜面１４は、図２に示すように前記端面４ａ１，４ｂ１の軸方向全長Ｌ１に亘って形成されている。これにより、図３に示すように、供給路２６を経て給油孔１３に沿って矢印ｂ方向に流れる潤滑油は、半割外輪２ａの内周面に到達すると、各半割保持器４ａ，４ａが矢印ａ方向に回転することで、各傾斜面１４に沿って径方向内方（矢印ｃ方向）へ導かれる。   In FIG. 1, among the circumferential end surfaces 4b1 and 4b2 of the half cage 4b, the end surface 4b1 located forward of the half cage 4b in the rotational direction (arrow a direction) is the end surface 4a1 of the half cage 4b. It is set as the inclined surface 14 similarly. As shown in FIG. 2, each inclined surface 14 is formed over the entire length L1 in the axial direction of the end surfaces 4a1 and 4b1. Accordingly, as shown in FIG. 3, when the lubricating oil flowing in the direction of the arrow b along the oil supply hole 13 through the supply passage 26 reaches the inner peripheral surface of the half outer ring 2a, each half retainer 4a, 4a. Is guided in the radially inward direction (arrow c direction) along each inclined surface 14 by rotating in the arrow a direction.

以上の構成の二つ割り転がり軸受１によれば、径方向外側から径方向内側に向かうに従って半割保持器４ａ，４ｂの回転方向に対して漸次逆方向に傾斜する半割保持器４ａ，４ｂの傾斜面１４により、半割外輪２ａの給油孔１３から供給される潤滑油を、シャフト５の高速回転により半割保持器４ａ，４ｂが回転することで、径方向内側に掻き込んで軸受内部へ導くことができる。これにより、潤滑油の供給量が少量であっても、潤滑不足により軸受に焼き付きが生じるのを抑制することができるため、二つ割り転がり軸受１の耐久性を向上することができる。   According to the split roller bearing 1 having the above-described configuration, the inclination of the half cages 4a and 4b that gradually inclines in the opposite direction with respect to the rotation direction of the half cages 4a and 4b from the radially outer side toward the radially inner side. Due to the surface 14, the lubricant supplied from the oil supply hole 13 of the half outer ring 2 a is scraped inward in the radial direction by the half cages 4 a and 4 b by the high-speed rotation of the shaft 5 and guided into the bearing. be able to. Thereby, even if the supply amount of the lubricating oil is small, it is possible to suppress the seizure of the bearing due to insufficient lubrication, and thus the durability of the split roller bearing 1 can be improved.

また、傾斜面１４は半割保持器４ａ，４ｂの円周方向の端面４ａ１，４ｂ１に形成されているため、傾斜面１４を形成することに起因して半割保持器４ａ，４ｂの強度が低下するのを抑制することができる。   Further, since the inclined surface 14 is formed on the circumferential end surfaces 4a1 and 4b1 of the half cages 4a and 4b, the strength of the half cages 4a and 4b is caused by the formation of the inclined surface 14. It can suppress that it falls.

また、傾斜面１４は前記端面４ａ１，４ｂ１の軸方向全長Ｌ１に亘って形成されているため、傾斜面１４により潤滑油を効率良く掻き込むことができる。   Further, since the inclined surface 14 is formed over the entire length L1 in the axial direction of the end surfaces 4a1 and 4b1, the lubricating oil can be scraped efficiently by the inclined surface 14.

図４は本発明の第２の実施形態に係る二つ割り転がり軸受を示す断面図である。第２の実施形態と第１の実施形態とが相違する点は、保持器における傾斜面の形成位置が異なる点である。なお、この実施形態のうち、第１の実施形態と同一構成であるものは、第１の実施形態と同一符号を付してその説明を省略する。   FIG. 4 is a cross-sectional view showing a split bearing according to a second embodiment of the present invention. The difference between the second embodiment and the first embodiment is that the inclined surface formation position in the cage is different. In this embodiment, those having the same configuration as that of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted.

第２の実施形態における保持器３０は、半円状の一対の半割保持器３０ａ，３０ｂからなっている。図５は図４のＢ−Ｂ断面図である。図４及び図５において、半割保持器３０ａ，３０ｂは、軸方向の両端部に配置された一対の円環部３１と、両円環部３１の間で軸方向に延びかつ周方向等間隔に配列されて両円環部３１を連結している複数の柱部３２とを備えている。隣接する柱部３２と一対の円環部３１とによって囲まれるポケット３３内にころ３を収容し、ころ３を円周方向に沿って所定間隔に保持している（図６参照）。   The cage 30 in the second embodiment includes a pair of half-circular halves 30a and 30b. 5 is a cross-sectional view taken along line BB in FIG. 4 and 5, the half cages 30a and 30b are a pair of annular portions 31 arranged at both ends in the axial direction, and extend in the axial direction between the annular portions 31, and are equally spaced in the circumferential direction. And a plurality of pillars 32 that connect the two annular parts 31 to each other. The roller 3 is accommodated in a pocket 33 surrounded by the adjacent column part 32 and the pair of annular parts 31, and the roller 3 is held at a predetermined interval along the circumferential direction (see FIG. 6).

図６は図４の要部拡大図である。各柱部３２における周方向両側の側壁面のうち、半割保持器３０ａ，３０ｂの回転方向（矢印ａ方向）前方に位置する側壁面３２ａには、給油孔１３から供給される潤滑油を径方向内側に掻き込む傾斜面３４が形成されている。この傾斜面３４は、半割保持器３０ａ，３０ｂの径方向外側から径方向内側に向かうに従って、半割保持器３０ａ，３０ｂの回転方向（矢印ａ方向）に対して漸次逆方向に傾斜している。傾斜面３４の傾斜角度θ２は、保持器３０の軸心Ｃ２と傾斜面３４の内周端Ｐ２とを結ぶ仮想線Ｘ２に対して１５〜６５度に設定されている。   6 is an enlarged view of a main part of FIG. Of the side wall surfaces on both sides in the circumferential direction of each column part 32, the lubricating oil supplied from the oil supply hole 13 has a diameter on the side wall surface 32 a positioned in front of the rotation direction of the half cages 30 a and 30 b (arrow a direction). An inclined surface 34 is formed to be raked inward in the direction. The inclined surface 34 is gradually inclined in the opposite direction with respect to the rotation direction (arrow a direction) of the half cages 30a and 30b from the outside in the radial direction to the inside in the radial direction of the half cages 30a and 30b. Yes. The inclination angle θ2 of the inclined surface 34 is set to 15 to 65 degrees with respect to a virtual line X2 connecting the axis C2 of the cage 30 and the inner peripheral end P2 of the inclined surface 34.

図５において、各傾斜面３４は、給油孔１３に対応させて前記側壁面３２ａの軸方向の一部に形成されている。具体的には、側壁面３２ａにおける給油孔１３の径方向内方に位置する部分に、給油孔１３の孔径よりも若干長い長さＬ２に亘って傾斜面３４が形成されている。これにより、図６に示すように、供給路２６を経て給油孔１３に沿って矢印ｂ方向に流れる潤滑油は、半割外輪２ａの内周面に到達すると、各半割保持器３０ａ，３０ｂが矢印ａ方向に回転することで、各傾斜面３４に沿って径方向内方（矢印ｄ方向）へ導かれる。   In FIG. 5, each inclined surface 34 is formed on a part of the side wall surface 32 a in the axial direction so as to correspond to the oil supply hole 13. Specifically, an inclined surface 34 is formed in a portion of the side wall surface 32a that is located radially inward of the oil supply hole 13 over a length L2 that is slightly longer than the hole diameter of the oil supply hole 13. Thus, as shown in FIG. 6, when the lubricating oil flowing in the direction of the arrow b along the oil supply hole 13 through the supply passage 26 reaches the inner peripheral surface of the half outer ring 2a, each half retainer 30a, 30b. Is guided in the radially inward direction (arrow d direction) along each inclined surface 34 by rotating in the arrow a direction.

以上の構成の二つ割り転がり軸受についても、半割外輪２ａの給油孔１３から供給される潤滑油を、シャフト５の高速回転により半割保持器３０ａ，３０ｂが回転することで、傾斜面３４により径方向内側に掻き込んで軸受内部へ導くことができる。これにより、潤滑油の供給量が少量であっても、潤滑不足により軸受に焼き付きが生じるのを抑制することができるため、二つ割り転がり軸受の耐久性を向上することができる。また、傾斜面３４は、柱部３２の軸方向の一部のみに形成されているため、傾斜面３４を形成することに起因して半割保持器３０ａ，３０ｂの強度が低下するのを抑制することができる。   Also in the split roller bearing having the above-described configuration, the lubricating oil supplied from the oil supply hole 13 of the half outer ring 2 a is rotated by the inclined surface 34 by rotating the half retainers 30 a and 30 b by the high-speed rotation of the shaft 5. It can be squeezed inward and guided into the bearing. Thereby, even if the supply amount of the lubricating oil is small, it is possible to suppress seizure of the bearing due to insufficient lubrication, and therefore it is possible to improve the durability of the double split bearing. Moreover, since the inclined surface 34 is formed only in a part of the column portion 32 in the axial direction, it is possible to prevent the strength of the half cages 30a and 30b from being reduced due to the formation of the inclined surface 34. can do.

本発明は、上記の実施形態に限定されることなく適宜変更して実施可能である。例えば、第１の実施形態の傾斜面１４は、保持器４の軸方向全長Ｌ１に亘って形成されているが、軸方向の一部のみに形成されていてもよい。
また、第２の実施形態では、柱部３２に傾斜面３４が形成されているが、これにい加えて、第１の実施形態の傾斜面１４が保持器４の分断面に形成されていてもよい。 The present invention is not limited to the above embodiment and can be implemented with appropriate modifications. For example, the inclined surface 14 of the first embodiment is formed over the entire axial length L1 of the cage 4, but may be formed only in a part of the axial direction.
In addition, in the second embodiment, the inclined surface 34 is formed in the column portion 32, but in addition to this, the inclined surface 14 of the first embodiment is formed in the sectional surface of the cage 4. Also good.

また、給油孔１３は外輪２の軸方向に複数形成されていてもよい。この場合、第２の実施形態の傾斜面３４は、各給油孔１３の径方向内方に配置されるように柱部３２の軸方向に複数形成されていてもよい。
さらに、軸受に内嵌されるシャフトとしてクランクシャフトのジャーナル部を例示したが、クランクシャフトのクランクピンや、カムシャフトなど他のシャフトにも本発明の軸受装置を適用することができる。 A plurality of oil supply holes 13 may be formed in the axial direction of the outer ring 2. In this case, a plurality of the inclined surfaces 34 of the second embodiment may be formed in the axial direction of the column portion 32 so as to be disposed radially inward of each oil supply hole 13.
Further, although the journal portion of the crankshaft is exemplified as the shaft fitted into the bearing, the bearing device of the present invention can be applied to other shafts such as a crankpin of the crankshaft and a camshaft.

また、前述した実施形態は、転動体としてころを用いたニードル軸受を備えているが、転動体としてボールを用いた玉軸受を採用することもできる。
また、保持器は、二つ割り構造に限らず、周方向の１箇所で分断されたリング構造とし、この分断された箇所を拡げてシャフトの外周側に取り付けるように構成してもよい。この場合、保持器の円周方向の両分断面のうち、少なくとも一方の分断面に傾斜面を形成すればよい。 Moreover, although embodiment mentioned above is provided with the needle bearing which used the roller as a rolling element, the ball bearing which used the ball as a rolling element can also be employ | adopted.
Further, the cage is not limited to the split structure, but may be configured to have a ring structure divided at one place in the circumferential direction, and the divided place may be expanded and attached to the outer peripheral side of the shaft. In this case, an inclined surface may be formed on at least one of the two cross sections in the circumferential direction of the cage.

１：二つ割り転がり軸受、２：外輪、３：ころ（転動体）、４，３０：保持器、４ａ１，４ｂ１：端面（分断面）、５：シャフト、１１：軌道面、１３：給油孔、１４，３４：傾斜面、２４：支持孔、２１：ハウジング、３２：柱部、３３：ポケット   1: two split rolling bearing, 2: outer ring, 3: roller (rolling element), 4, 30: cage, 4a1, 4b1: end face (divided section), 5: shaft, 11: raceway surface, 13: oil supply hole, 14 , 34: inclined surface, 24: support hole, 21: housing, 32: pillar, 33: pocket

Claims (3)

径方向に貫通する給油孔を有し、円周方向に二つ割りにされた外輪と、
前記外輪の内周の軌道面を転動する複数個の転動体と、
円周上の少なくとも１箇所で分断され、前記転動体を円周方向に沿って所定間隔に保持する保持器とを備え、
シャフトが内嵌されるとともに、前記外輪によって前記保持器の回転が案内される二つ割り転がり軸受であって、
前記保持器には、径方向外側から径方向内側に向かうに従って前記保持器の回転方向に対して漸次逆方向に傾斜して、前記給油孔から供給される潤滑油を前記保持器の回転により径方向内側に掻き込む傾斜面が形成されており、
前記傾斜面が、前記保持器の円周方向両分断面の少なくとも一方の分断面に形成されていることを特徴とする二つ割り転がり軸受。 An outer ring having an oil supply hole penetrating in the radial direction and divided in two in the circumferential direction;
A plurality of rolling elements that roll on the inner raceway surface of the outer ring;
A cage that is divided at at least one location on the circumference and holds the rolling elements at a predetermined interval along the circumferential direction;
A split bearing in which a shaft is internally fitted and rotation of the cage is guided by the outer ring,
The cage is gradually inclined in the reverse direction with respect to the rotation direction of the cage as it goes from the radially outer side to the radially inner side, and the lubricating oil supplied from the oil supply hole is changed in diameter by the rotation of the cage. An inclined surface that is scraped inward is formed ,
2. The split roller bearing according to claim 2, wherein the inclined surface is formed on at least one of the circumferentially divided sections of the cage. 前記傾斜面が、前記分断面の軸方向全長に亘って形成されている請求項１に記載の二つ割り転がり軸受。 The split bearing according to claim 1 , wherein the inclined surface is formed over the entire axial length of the divided section. 請求項１または２に記載の二つ割り転がり軸受と、
前記二つ割り転がり軸受の外輪を密嵌して支持する支持孔を有するハウジングと、を備えていることを特徴とする軸受装置。 The split roller bearing according to claim 1 or 2 ,
And a housing having a support hole for tightly fitting and supporting an outer ring of the split roller bearing.
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