JPH0763221A - Wound bush bearing - Google Patents

Abstract

PURPOSE:To restrain the outflow of oil to prevent seizure, etc., by providing a relief part recessed outside in a radial direction on an inner peripheral side of a joint portion to be formed protrudedly in a shaft-rotation direction in the middle part in a bearing width direction. CONSTITUTION:A plate 16 is wound into a true circle shape with a corner- smoothed 17 surface formed as an inner surface, opposite end parts are made to abut on each other to be adopted as a bush bearing 11, and a relief part 15 is formed protrudedly in the rotation direction of a shaft 12. Oil supplied to a bearing sliding surface from an oil supply hole 13 is dragged by the rotation of the shaft 12 to flow in the rotation direction to enter an oil groove composed of the relief part 15, successively dragged by the rotation of the shaft 12. Since the oil groove is formed protrudedly in a shaft rotation direction, the oil is apt to be drawn more to the tip side of a protruded part in the oil groove. That is, to the middle side in a bearing width direction. Consequently oil drag by the shaft 12 is applied in a direction for preventing the oil from flowing out of the oil groove. As a result, oil pressure lowering in the bearing part can be prevented to improve seizure resistance.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、巻きブッシュ軸受に関
する。FIELD OF THE INVENTION This invention relates to wound bush bearings.

【０００２】[0002]

【従来の技術】従来、平板を巻いて作製した巻きブッシ
ュ軸受は知られている。さらに、特開昭６０−２０１１
１５号公報は、平板を巻くときの端部の巻き力を小さく
するために平板を平行四辺形に形成してそれを巻くよう
にすることを開示している。平行四辺形の平板を巻いた
場合は、図５に示すように、巻きブッシュ軸受１の合わ
せ目４は軸受軸方向から傾く。上記公報は、また、合わ
せ目におけるずれによる悪影響等を防止するために、合
わせ目内周側に、半径方向外方に凹む逃げ部５を設ける
ことを開示している。シャフト２が軸受１に嵌挿されて
回転されるとき、給油穴３から供給された潤滑油は逃げ
部５に入り、逃げ部５は油溝としても作用する。2. Description of the Related Art Conventionally, a wound bush bearing manufactured by winding a flat plate is known. Furthermore, JP-A-60-2011
Japanese Unexamined Patent Publication No. 15 discloses that a flat plate is formed into a parallelogram and is wound in order to reduce a winding force of an end portion when the flat plate is wound. When a parallelogram flat plate is wound, the seam 4 of the wound bush bearing 1 is inclined from the bearing axial direction, as shown in FIG. The above publication also discloses that, in order to prevent an adverse effect or the like due to a shift at the seam, a relief portion 5 that is recessed radially outward is provided on the inner peripheral side of the seam. When the shaft 2 is fitted in the bearing 1 and rotated, the lubricating oil supplied from the oil supply hole 3 enters the relief portion 5, and the relief portion 5 also functions as an oil groove.

【０００３】[0003]

【発明が解決しようとする課題】しかし、従来巻きブッ
シュ軸受には、次の問題があった。給油穴から供給され
たオイルは逃げ部からなる油溝に集められ、比較的容易
に流れ出てしまい、軸受部の油圧低下により軸受および
シャフトの焼付き、摩耗などの不具合が発生する。とく
に、逃げ部からなる油溝がシャフト回転方向に対して直
角以外の一定の角度θを有するときは、図６に示すよう
に、シャフト回転で発生するオイル流れ（ひきずり）に
よるポンプ作用で、オイルが油溝からより流出しやすく
なるという問題がある。本発明の目的は、合わせ目内周
に逃げ部を有する巻きブッシュ軸受におけるオイルの流
出を抑制し、焼付きなどを防止できる巻きブッシュ軸受
を提供することにある。However, the conventional wound bush bearing has the following problems. The oil supplied from the oil supply hole is collected in the oil groove composed of the escape portion and flows out relatively easily, and the oil pressure of the bearing portion is lowered, causing problems such as seizure and wear of the bearing and the shaft. In particular, when the oil groove formed by the relief portion has a constant angle θ other than a right angle with respect to the shaft rotation direction, as shown in FIG. 6, the oil is generated by the pumping action by the oil flow (trailing) generated by the shaft rotation. There is a problem that the oil easily flows out from the oil groove. An object of the present invention is to provide a wound bush bearing that can prevent oil from flowing out in a wound bush bearing having an escape portion on the inner circumference of a seam and prevent seizure.

【０００４】[0004]

【課題を解決するための手段】上記目的を達成するため
の、本発明の巻きブッシュ軸受は次のものから成る。す
なわち、合わせ目内周側に半径方向外方に凹む逃げ部を
設けた巻きブッシュ軸受において、合わせ目の逃げ部を
軸受幅方向中間部分で軸回転方向に凸となるように形成
した巻きブッシュ軸受。In order to achieve the above object, the wound bush bearing of the present invention comprises: That is, in a wound bush bearing in which a relief portion that is recessed outward in the radial direction is provided on the inner peripheral side of the seam, the relief portion of the seam is formed so as to be convex in the axial rotation direction at the intermediate portion in the bearing width direction. .

【０００５】[0005]

【作用】上記本発明の巻きブッシュ軸受では、逃げ部は
油溝としても働くが、逃げ部に入った潤滑油は、シャフ
ト回転によるオイルひきずりにより、軸回転方向に凸と
なっている逃げ部のブッシュ幅方向中央部分へと集めら
れようとし、逃げ部のブッシュ幅方向両端から流出しに
くくなる。その結果、軸受部の油圧低下が防止され、軸
受とシャフトとの耐焼付き性が向上される。In the wound bush bearing of the present invention described above, the relief portion also functions as an oil groove, but the lubricating oil that has entered the relief portion has a convex shape in the axial rotation direction due to the oil drag caused by the shaft rotation. It tends to be collected in the central portion in the bush width direction, and it becomes difficult for the relief portion to flow out from both ends in the bush width direction. As a result, a decrease in oil pressure in the bearing is prevented, and seizure resistance between the bearing and the shaft is improved.

【０００６】[0006]

【実施例】以下に、本発明の望ましい実施例を、図１〜
図４を参照して説明する。図１〜図４において、１１は
帯状の平板を巻き端部を突き合わせた巻きブッシュ軸受
を示し、この巻きブッシュ軸受１１にシャフト１２が、
回転自在に挿入され支持される。巻きブッシュ軸受１１
とシャフト１２との回転の潤滑のために、巻きブッシュ
軸受１１とシャフト１２の何れか一方に給油穴１３が設
けられている。図１は給油穴１３がシャフト１２の方に
設けられた場合を示しており、シャフト１２に形成した
油通路（図示せず）からの潤滑油を給油穴１３を通し
て、巻きブッシュ軸受１１とシャフト１２との間の摺動
面に供給し、潤滑する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to FIGS.
This will be described with reference to FIG. In FIGS. 1 to 4, reference numeral 11 denotes a winding bush bearing in which strip-shaped flat plates are abutted at their winding ends, and the shaft 12 is attached to the winding bush bearing 11.
It is rotatably inserted and supported. Rolled bush bearing 11
An oil supply hole 13 is provided in either one of the wound bush bearing 11 and the shaft 12 in order to lubricate the rotation of the shaft 12 and the shaft 12. FIG. 1 shows a case where the oil supply hole 13 is provided on the shaft 12, and the lubricating oil from an oil passage (not shown) formed in the shaft 12 is passed through the oil supply hole 13 to pass the rolling bush bearing 11 and the shaft 12 together. Supply and lubricate the sliding surface between and.

【０００７】巻きブッシュ軸受１１の合わせ目１４（合
い口）の内周側には、半径方向外方に凹む逃げ部１５が
加工されており、平板を巻いた時の突き合わせ部の両側
の素材端部に半径方向のずれが生じ、段差の角がシャフ
ト外周面を傷つけたり、回転に悪影響を与えないように
してある。このような逃げ部１５が、そこにオイルが一
時的に溜まる油溝としても機能し、摺動面全面へのオイ
ルの補給を円滑にする。A relief portion 15 which is recessed radially outward is formed on the inner peripheral side of the seam 14 (abutment opening) of the wound bush bearing 11, and the material ends on both sides of the butted portion when the flat plate is wound. A radial deviation occurs in the portion, and the angle of the step does not damage the outer peripheral surface of the shaft or adversely affect the rotation. Such an escape portion 15 also functions as an oil groove in which oil temporarily accumulates, and facilitates oil supply to the entire sliding surface.

【０００８】逃げ部１５は、軸受幅方向中間部分で軸回
転方向に凸となるように形成されている。図１の逃げ部
１５は、図２に示す平板１６を巻くことによって形成さ
れる。図２の平板１６は長方形の帯状の平板の端部に、
逃げ部１５のための、平面視で縁が「く」の字状の角落
し１７を施したものである。この平板１６を、角落しを
した方の面が内面になるように真円に巻き、対向する端
部を突き合わせると図１の巻きブッシュ軸受１１とな
る。長方形の平板１６を用いると、合わせ目１４の方向
は軸受軸方向となる。ただし、逃げ部１５は「く」の字
状で、シャフト１２の回転方向に向って凸となる。The relief portion 15 is formed so as to be convex in the axial rotation direction at the bearing width direction intermediate portion. The escape portion 15 in FIG. 1 is formed by winding the flat plate 16 shown in FIG. The flat plate 16 of FIG. 2 is at the end of the rectangular strip flat plate,
The relief portion 15 is provided with a corner drop 17 having a V-shaped edge in a plan view. This flat plate 16 is wound into a perfect circle so that the side with the angled surface becomes the inner surface, and the opposite ends are butted against each other to obtain the wound bush bearing 11 of FIG. When the rectangular flat plate 16 is used, the direction of the seam 14 is the bearing axial direction. However, the escape portion 15 has a V shape and is convex in the rotation direction of the shaft 12.

【０００９】逃げ部１５は、また、図３に示す形状をも
つ平板１８を巻くことによって形成してもよい。図３の
平板１８は、一端が「く」の字状に長手方向に突出し他
端が「く」の字状に長手方向に凹んだ帯状の平板の端部
に、縁が「く」の字状の角落し１９を施したものであ
る。この平板１８を、角落しした方の面が内面になるよ
うに真円を巻き、対向する端部を突き合わせて巻きブッ
シュ軸受１１とする。「く」の字状端をもつ平板１８を
用いると、合わせ目１４も、軸回転方向に凸となる
「く」の字状を呈する。ただし、逃げ部１５は図２の素
材を用いる場合と同様、「く」の字状である。「く」の
字状端部を突き合わせた場合は、両端が互いに軸受軸方
向にずれることはない。なお、巻きブッシュの突き合わ
せ端部の形状は、「く」の字ばかりでなく、任意の雄雌
嵌合形状としてもよい。The relief portion 15 may be formed by winding a flat plate 18 having the shape shown in FIG. The flat plate 18 shown in FIG. 3 has a strip-shaped flat plate with one end protruding in the longitudinal direction in the shape of a "V" and the other end being recessed in the longitudinal direction in the shape of a "C" at the edge. It is the one with a rounded corner drop 19 applied. The flat plate 18 is wound in a perfect circle so that the surface with the angled side becomes the inner surface, and the opposite ends are abutted to each other to form the wound bush bearing 11. When the flat plate 18 having the “V” -shaped end is used, the seam 14 also has a “V” shape that is convex in the axial rotation direction. However, the escape portion 15 has a “<” shape like the case where the material of FIG. 2 is used. When the ends of the dogleg shape are abutted against each other, both ends are not displaced from each other in the bearing axial direction. The shape of the abutting end of the winding bush is not limited to the V-shape, but may be any male-female fitting shape.

【００１０】つぎに、作用を説明する。給油穴１３から
軸受摺動面に供給されたオイルは、シャフト１２の回転
にひきずれらて、シャフト１２の回転方向に、一方向に
流れる。図４に示すように、一方向に流れるオイルは、
逃げ部１５からなる油溝に入り引き続きシャフト１２の
回転にひきずられるが、この油溝は軸回転方向に凸とさ
れているので、オイルは油溝内をさらに凸の先端側、す
なわち軸受幅方向中央側に寄せられようとする。したが
って、シャフト１２によるオイルのひきずりが、オイル
が油溝から出るのを阻止する方向に働らく。このため、
軸受部の油圧低下を防止でき、耐焼付き性を向上でき
る。Next, the operation will be described. The oil supplied from the oil supply hole 13 to the bearing sliding surface is displaced by the rotation of the shaft 12 and flows in one direction in the rotation direction of the shaft 12. As shown in FIG. 4, the oil flowing in one direction is
The oil enters the oil groove formed by the escape portion 15 and is continuously dragged by the rotation of the shaft 12, but since this oil groove is convex in the axial rotation direction, the oil is further convex inside the oil groove, that is, in the bearing width direction. Trying to get closer to the center. Therefore, the drag of the oil by the shaft 12 works in a direction to prevent the oil from coming out of the oil groove. For this reason,
It is possible to prevent a decrease in oil pressure in the bearing portion and improve seizure resistance.

【００１１】また、巻きブッシュ軸受の逃げ部１５から
なる油溝からの潤滑油洩れ量を低減できることにより、
オイルポンプ容量を減少でき、コストダウン、ポンプの
フリクション低減、軽量化もはかれる。また、図１の巻
きブッシュ軸受を、オーバヘッドカムシャフト型内燃機
関のカムシャフト軸受に用いることにより、軸受からの
オイル洩れ（飛散）量を低減できるため、ＰＣＶ（ポジ
ティブクランクケースベンチレーション）システムから
の吸気系のオイル持ち去り量を低減でき、また、オイル
フィラーキャップ締め忘れ時のオイル飛散量を低減でき
る。Further, since the amount of lubricating oil leaking from the oil groove formed by the relief portion 15 of the wound bush bearing can be reduced,
The oil pump capacity can be reduced, and the cost, pump friction and weight can be reduced. Further, by using the wound bush bearing of FIG. 1 as a camshaft bearing of an overhead camshaft type internal combustion engine, the amount of oil leakage (scattering) from the bearing can be reduced, so that a PCV (positive crankcase ventilation) system can be used. The amount of oil taken away from the intake system can be reduced, and the amount of oil splashed when forgetting to tighten the oil filler cap can be reduced.

【００１２】[0012]

【発明の効果】本発明によれば、巻きブッシュ軸受の合
わせ目の内周側に形成した逃げ部を、軸回転方向に凸と
なるように形成したので、シャフト回転のオイルひきず
りによってオイルが逃げ部の軸受幅方向中央に寄せら
れ、軸受からのオイル洩れが抑えられ、軸受の焼付きが
防止される。According to the present invention, since the relief portion formed on the inner peripheral side of the joint of the wound bush bearing is formed so as to be convex in the axial rotation direction, the oil escapes by the oil drag of the shaft rotation. The oil is leaked from the bearing to prevent the seizure of the bearing.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の一実施例に係る巻きブッシュ軸受とそ
れに挿入されるシャフトの斜視図である。FIG. 1 is a perspective view of a wound bush bearing and a shaft inserted therein according to an embodiment of the present invention.

【図２】図１の巻きブッシュ軸受の巻き前の平板の斜視
図である。FIG. 2 is a perspective view of a flat plate of the wound bush bearing of FIG. 1 before winding.

【図３】図２とは別の本発明実施例の巻き前の平板の斜
視図である。FIG. 3 is a perspective view of a flat plate before winding according to another embodiment of the present invention different from FIG.

【図４】図１の巻きブッシュ軸受におけるオイルの流れ
を示す部分斜視図である。4 is a partial perspective view showing an oil flow in the wound bush bearing of FIG. 1. FIG.

【図５】従来の巻きブッシュ軸受とシャフトの斜視図で
ある。FIG. 5 is a perspective view of a conventional wound bush bearing and shaft.

【図６】図５の巻きブッシュ軸受におけるオイルの流れ
を示す斜視図でる。6 is a perspective view showing an oil flow in the wound bush bearing of FIG. 5. FIG.

【符号の説明】[Explanation of symbols]

１１ 巻きブッシュ軸受 １２ シャフト １３ 給油穴 １４ 合わせ目 １５ 逃げ部 11 Rolled bush bearing 12 Shaft 13 Oil supply hole 14 Seam 15 Relief part

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 合わせ目内周側に半径方向外方に凹む逃
げ部を設けた巻きブッシュ軸受において、合わせ目の逃
げ部を軸受幅方向中間部分で軸回転方向に凸となるよう
に形成したことを特徴とする巻きブッシュ軸受。1. In a wound bush bearing having a relief portion that is recessed radially outward on the inner circumference side of the seam, the relief portion of the seam is formed so as to be convex in the axial rotation direction at an intermediate portion in the bearing width direction. Rolled bush bearings characterized in that