JP2010276052A - Retainer for ball bearing and ball bearing - Google Patents

Retainer for ball bearing and ball bearing Download PDF

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Publication number
JP2010276052A
JP2010276052A JP2009126733A JP2009126733A JP2010276052A JP 2010276052 A JP2010276052 A JP 2010276052A JP 2009126733 A JP2009126733 A JP 2009126733A JP 2009126733 A JP2009126733 A JP 2009126733A JP 2010276052 A JP2010276052 A JP 2010276052A
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Japan
Prior art keywords
ball
ball bearing
pocket
bearing retainer
rotation axis
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JP2009126733A
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Japanese (ja)
Inventor
Tomokazu Nakagawa
友和 中川
Yasuyuki Katayama
康行 片山
Makoto Muramatsu
誠 村松
Kenta Sakaguchi
健太 坂口
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2009126733A priority Critical patent/JP2010276052A/en
Priority to PCT/JP2010/057345 priority patent/WO2010137434A1/en
Publication of JP2010276052A publication Critical patent/JP2010276052A/en
Withdrawn legal-status Critical Current

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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
    • F16C33/38—Ball cages
    • F16C33/41—Ball cages comb-shaped
    • F16C33/418—Details of individual pockets, e.g. shape or ball retaining means
    • 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
    • F16C33/38—Ball cages
    • F16C33/41—Ball cages comb-shaped
    • F16C33/412—Massive or moulded comb cages, e.g. snap ball cages
    • F16C33/414—Massive or moulded comb cages, e.g. snap ball cages formed as one-piece cages, i.e. monoblock comb cages
    • 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
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • 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
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap

Abstract

<P>PROBLEM TO BE SOLVED: To provide a retainer for ball bearing, which can easily reduce a torque caused by the contacting resistance between the inner surface of retainer pocket and a ball. <P>SOLUTION: A crown-shaped retainer 15 for ball bearing, which is annually formed in whole shape and has pockets 15c opening to the outer diameter side or inner diameter side, respectively, at a plurality of locations in its circumferential direction, and retains balls 14 in free rolling in the pockets 15c, wherein a groove 15e as an irregular part, which shifts a contacting point P<SB>1</SB>with the ball 14 from the maximum diameter position of the ball 14 with respect to the rotary shaft L of the ball 14 in the rotary shaft direction, is arranged on the inner surface 15d of the pocket 15c. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、玉を転動自在に保持する樹脂製の玉軸受用保持器、およびその保持器を外輪および内輪間に組み込んだ玉軸受に関する。   The present invention relates to a resin ball bearing cage that holds balls in a freely rollable manner, and a ball bearing in which the cage is incorporated between an outer ring and an inner ring.

各種装置を構成する回転軸などの回転部分を、ハウジングなどの固定部分に対して回転自在に支持するために、図６に示すような玉軸受１が広く使用されている（例えば、特許文献１参照）。   A ball bearing 1 as shown in FIG. 6 is widely used to rotatably support a rotating part such as a rotating shaft constituting various devices with respect to a fixed part such as a housing (for example, Patent Document 1). reference).

この種の玉軸受１は、同図に示すように外径面に内側転走面２ａが形成された内輪２と、その内輪２の外側に配置され、内径面に外側転走面３ａが形成された外輪３と、内輪２の内側転走面２ａと外輪３の外側転走面３ａとの間に転動自在に介在された複数の玉４と、内輪２と外輪３との間に配され、各玉４を円周方向等間隔に保持する樹脂製の保持器５とで主要部が構成されている。この外輪３あるいは内輪２のいずれか一方がハウジングなどの固定部分に装着され、他方が回転軸などの回転部分に装着される。   This type of ball bearing 1 includes an inner ring 2 having an inner rolling surface 2a formed on the outer diameter surface and an outer side of the inner ring 2 as shown in the figure, and an outer rolling surface 3a formed on the inner diameter surface. Between the inner ring 2 and the outer ring 3, a plurality of balls 4 movably interposed between the inner race surface 2 a of the inner ring 2 and the outer race surface 3 a of the outer ring 3. The main part is composed of a resin cage 5 that holds the balls 4 at equal intervals in the circumferential direction. Either the outer ring 3 or the inner ring 2 is attached to a fixed part such as a housing, and the other is attached to a rotating part such as a rotating shaft.

この内輪２と外輪３との間に配された冠形状の保持器５は、図７（ａ）（ｂ）に示すように、円環状をなす主部５ａと、その主部５ａの軸方向片面に互いに間隔をあけて円周方向等配で一体的に突設された一対ずつの弾性片５ｂとで構成され、これら一対ずつの弾性片５ｂの間に凹設されて外径側と内径側とに開口したポケット５ｃを備え、そのポケット５ｃで玉４を転動自在に保持する。   As shown in FIGS. 7 (a) and 7 (b), a crown-shaped cage 5 disposed between the inner ring 2 and the outer ring 3 includes an annular main portion 5a and the axial direction of the main portion 5a. It is composed of a pair of elastic pieces 5b that are integrally protruded in a circumferentially spaced manner on one side, and is provided between the pair of elastic pieces 5b so as to be recessed between the outer diameter side and the inner diameter. A pocket 5c opened to the side is provided, and the ball 4 is held by the pocket 5c so as to freely roll.

また、内輪２と外輪３の軸方向両側には、図６に示すようにその内輪２と外輪３との間の環状空間を密封するためのシール部材６が配置されている。このシール部材６は、芯金６ａとその芯金６ａに一体的に加硫接着された弾性体６ｂとからなり、その基端部が外輪３の内径端部に装着され、先端部が内輪２の外径端部に接触するシールリップ６ｃが形成されている。なお、図示の玉軸受１では、シール部材６の基端部が装着された外輪２が固定側であり、シールリップ６ｃが接触する内輪２が回転側である。   Further, seal members 6 for sealing the annular space between the inner ring 2 and the outer ring 3 are arranged on both sides in the axial direction of the inner ring 2 and the outer ring 3 as shown in FIG. The seal member 6 includes a cored bar 6a and an elastic body 6b that is integrally vulcanized and bonded to the cored bar 6a. A base end of the seal member 6 is attached to an inner diameter end of the outer ring 3, and a tip of the inner ring 2 is attached. A seal lip 6c is formed in contact with the outer diameter end of the. In the illustrated ball bearing 1, the outer ring 2 to which the base end portion of the seal member 6 is attached is the fixed side, and the inner ring 2 with which the seal lip 6c contacts is the rotating side.

この玉軸受１の運転中、シール部材６の先端のシールリップ６ｃが内輪２の外径端部に摺接した状態を維持しながら、内輪２が回転する。これにより、水やダスト等の異物が軸受内部に侵入したり、あるいは、軸受内部からグリース等の潤滑剤が外部へ漏れたりすることを未然に防止するようにしている。   During the operation of the ball bearing 1, the inner ring 2 rotates while maintaining the state where the seal lip 6 c at the tip of the seal member 6 is in sliding contact with the outer diameter end of the inner ring 2. This prevents foreign matters such as water and dust from entering the inside of the bearing or leakage of a lubricant such as grease from the inside of the bearing to the outside.

特開２００１−２４１４４８号公報JP 2001-241448 A

ところで、前述した玉軸受用保持器５では、玉４を転動自在に保持するためのポケット５ｃの内面５ｄが玉４の外径形状に沿う単一の部分凹球面で形成されており、図７（ｂ）に示すようにポケット５ｃの内面５ｄと玉４との接触位置は玉４の回転軸Ｌに対する最大径ｒの位置Ｐとなっている。   By the way, in the ball bearing cage 5 described above, the inner surface 5d of the pocket 5c for holding the ball 4 in a freely rolling manner is formed of a single partially concave spherical surface along the outer diameter shape of the ball 4. 7 (b), the contact position between the inner surface 5d of the pocket 5c and the ball 4 is the position P of the maximum diameter r with respect to the rotation axis L of the ball 4.

近年、自動車用途の玉軸受１においては、燃費向上などの環境問題からもトルク低減が求められている。この玉軸受１におけるトルクは、保持器５のポケット５ｃの内面５ｄと玉４との接触抵抗が一つの決定要素として存在する。このことから、従来の玉軸受用保持器５では、ポケット５ｃの内面５ｄと玉４との接触位置が玉４の回転軸Ｌに対する最大径ｒの位置Ｐとなっているため、ポケット５ｃの内面５ｄと玉４との接触抵抗も最大となり、玉軸受１のトルクを低減させることが困難であった。   In recent years, in ball bearings 1 for use in automobiles, torque reduction has been demanded from environmental problems such as improved fuel consumption. As for the torque in the ball bearing 1, the contact resistance between the inner surface 5 d of the pocket 5 c of the cage 5 and the ball 4 exists as one determining factor. From this, in the conventional ball bearing retainer 5, the contact position between the inner surface 5d of the pocket 5c and the ball 4 is the position P of the maximum diameter r with respect to the rotation axis L of the ball 4, and therefore the inner surface of the pocket 5c. The contact resistance between 5d and the ball 4 is also maximized, and it is difficult to reduce the torque of the ball bearing 1.

そこで、本発明は前述の問題点に鑑みて提案されたもので、その目的とするところは、ポケットの内面と玉との接触抵抗を起因とするトルクを容易に低減させ得る玉軸受用保持器および玉軸受を提供することにある。   Accordingly, the present invention has been proposed in view of the above-mentioned problems, and the object of the present invention is to provide a ball bearing retainer that can easily reduce the torque caused by the contact resistance between the inner surface of the pocket and the ball. And providing a ball bearing.

前述の目的を達成するための技術的手段として、本発明は、全体を円環状に形成してその円周方向複数箇所にそれぞれが外径側と内径側とに開口したポケットを有し、ポケットで玉を転動自在に保持する冠形状の玉軸受用保持器であって、ポケットの内面に、玉との接触位置を玉の回転軸に対する玉の最大径位置から回転軸方向へずらす凹凸部を設けたことを特徴とする。   As a technical means for achieving the above-mentioned object, the present invention comprises a pocket which is formed in an annular shape as a whole, and which is open to the outer diameter side and the inner diameter side at a plurality of locations in the circumferential direction. This is a crown-shaped ball bearing retainer that holds a ball in a freely rolling manner, and has an irregular portion that shifts the contact position with the ball from the maximum diameter position of the ball to the rotation axis direction on the inner surface of the pocket. Is provided.

本発明では、ポケットの内面に、玉との接触位置を玉の回転軸に対する玉の最大径位置から回転軸方向へずらす凹凸部を設けたことにより、そのポケットの内面に形成された凹凸部と玉との接触抵抗を、ポケットの内面と玉との接触位置が玉の回転軸に対する玉の最大径位置となる場合よりも小さくすることができる。その結果、このポケットの内面と玉との接触抵抗を起因とするトルクを容易に低減させることができる。   In the present invention, an uneven portion formed on the inner surface of the pocket is provided on the inner surface of the pocket by providing an uneven portion that shifts the contact position with the ball from the maximum diameter position of the ball to the rotation axis direction with respect to the rotation axis of the ball. The contact resistance with the ball can be made smaller than when the contact position between the inner surface of the pocket and the ball is the maximum diameter position of the ball with respect to the rotation axis of the ball. As a result, the torque caused by the contact resistance between the inner surface of the pocket and the ball can be easily reduced.

本発明における凹凸部としては、径方向に沿って形成された溝が有効である。この場合、ポケットの内面と玉との接触位置は、ポケットの内面の溝エッジ部となり、その接触位置を玉の回転軸に対する玉の最大径位置から回転軸方向へずらすことで、玉との接触抵抗を小さくすることによりトルクの低減が図れる。   As the uneven portion in the present invention, a groove formed along the radial direction is effective. In this case, the contact position between the inner surface of the pocket and the ball becomes the groove edge portion of the inner surface of the pocket, and the contact position with the ball is shifted by shifting the contact position in the direction of the rotation axis from the maximum diameter position of the ball with respect to the rotation axis of the ball. The torque can be reduced by reducing the resistance.

本発明における凹凸部としては、径方向に沿って形成されたリブが有効である。この場合、ポケットの内面と玉との接触位置は、ポケットの内面に形成されたリブとなり、その接触位置を玉の回転軸に対する玉の最大径位置から回転軸方向へずらすことで、玉との接触抵抗を小さくすることによりトルクの低減が図れる。   As the concavo-convex portion in the present invention, ribs formed along the radial direction are effective. In this case, the contact position between the inner surface of the pocket and the ball becomes a rib formed on the inner surface of the pocket, and by shifting the contact position from the maximum diameter position of the ball to the rotation axis direction with respect to the rotation axis of the ball, The torque can be reduced by reducing the contact resistance.

なお、リブは、径方向に沿って二条で形成されていることが望ましい。このようにすれば、玉がポケットの内面と軸方向で二点接触することになり、玉を転動自在に保持する上で玉の姿勢を安定させることができる。   In addition, as for a rib, it is desirable to be formed in two strips along a radial direction. In this way, the ball comes into contact with the inner surface of the pocket at two points in the axial direction, and the posture of the ball can be stabilized when the ball is held freely rolling.

本発明における凹凸部としては、径方向に沿って配設された複数の突起が有効である。この場合、ポケットの内面と玉との接触位置は、ポケットの内面に形成された突起となり、その接触位置を玉の回転軸に対する玉の最大径位置から回転軸方向へずらすことで、玉との接触抵抗を小さくすることによりトルクの低減が図れる。   As the uneven portion in the present invention, a plurality of protrusions arranged along the radial direction are effective. In this case, the contact position between the inner surface of the pocket and the ball becomes a protrusion formed on the inner surface of the pocket, and the contact position is shifted from the maximum diameter position of the ball with respect to the rotation axis of the ball in the direction of the rotation axis. The torque can be reduced by reducing the contact resistance.

なお、突起は、径方向に沿って二列で形成されていることが望ましい。このようにすれば、玉がポケットの内面と軸方向で二点接触することになり、玉を転動自在に保持する上で玉の姿勢を安定させることができる。   Note that the protrusions are preferably formed in two rows along the radial direction. In this way, the ball comes into contact with the inner surface of the pocket at two points in the axial direction, and the posture of the ball can be stabilized when the ball is held freely rolling.

また、本発明における凹凸部は、ポケットの内面の少なくとも円周方向片側に形成されていればよい。凹凸部をポケットの円周方向片側に形成すれば、その円周方向片側での玉との接触位置を玉の回転軸に対する玉の最大径位置から回転軸方向へずらすことで、玉との接触抵抗を小さくすることによりトルクの低減が図れる。また、凹凸部をポケットの円周方向両側に形成すれば、その円周方向両側での玉との接触位置を玉の回転軸に対する玉の最大径位置から回転軸方向へずらすことで、玉との接触抵抗を円周方向片側の場合よりもさらに小さくすることにより、より一層のトルクの低減が図れる。   Moreover, the uneven | corrugated | grooved part in this invention should just be formed in the circumferential direction one side of the inner surface of a pocket. If the concave and convex portions are formed on one side in the circumferential direction of the pocket, the contact position with the ball on one side in the circumferential direction is shifted from the maximum diameter position of the ball to the rotation axis direction with respect to the rotation axis of the ball. The torque can be reduced by reducing the resistance. In addition, if the concave and convex portions are formed on both sides in the circumferential direction of the pocket, the contact position with the balls on both sides in the circumferential direction is shifted from the maximum diameter position of the ball to the rotation axis direction with respect to the rotation axis of the ball. The torque can be further reduced by further reducing the contact resistance of the contact resistance in the circumferential direction.

本発明における凹凸部は、切削加工あるいは射出成形により形成することが望ましい。このように切削加工あるいは射出成形により凹凸部を形成すれば、その凹凸部を容易に形成することができてコスト低減が図れる。   The uneven portion in the present invention is desirably formed by cutting or injection molding. In this way, if the uneven portion is formed by cutting or injection molding, the uneven portion can be easily formed and the cost can be reduced.

本発明におけるポケットの内面に、内径側のポケット開口縁から外径側へ延びる凹みを形成することが望ましい。このようにすれば、玉に付着しているグリースを保持器の内径面で掻き取る量が減少する。これにより、内輪の外径部へのグリース付着を防止することができるので、内輪のシール溝へのグリースの流動を防止でき、結果として玉軸受からのグリース漏れを防止できる。   It is desirable to form a recess extending from the pocket opening edge on the inner diameter side to the outer diameter side on the inner surface of the pocket in the present invention. In this way, the amount of grease that adheres to the balls is scraped off by the inner diameter surface of the cage. As a result, it is possible to prevent the grease from adhering to the outer diameter portion of the inner ring, so that it is possible to prevent the grease from flowing into the seal groove of the inner ring, and as a result, it is possible to prevent grease leakage from the ball bearing.

以上の構成を具備した保持器に、互いに相対回転する外輪および内輪と、前記外輪と内輪との間に介在する玉とを付加すれば、玉軸受を構成することができる。   A ball bearing can be configured by adding an outer ring and an inner ring that rotate relative to each other and a ball interposed between the outer ring and the inner ring to the cage having the above-described configuration.

本発明によれば、ポケットの内面に、玉との接触位置を玉の回転軸に対する玉の最大径位置から回転軸方向へずらす凹凸部を設けたことにより、そのポケットの内面に形成された凹凸部と玉との接触抵抗を、ポケットの内面と玉との接触位置が玉の回転軸に対する玉の最大径位置となる場合よりも小さくすることができる。その結果、このポケットの内面と玉との接触抵抗を起因とするトルクを容易に低減させることができる。これにより、近年における燃費向上などの環境問題に適合した自動車用途の玉軸受を提供できる。   According to the present invention, the concave and convex portions formed on the inner surface of the pocket by providing the concave and convex portions on the inner surface of the pocket to shift the contact position with the ball from the maximum diameter position of the ball to the rotational axis direction with respect to the rotational axis of the ball. The contact resistance between the portion and the ball can be made smaller than when the contact position between the inner surface of the pocket and the ball is the maximum diameter position of the ball with respect to the rotation axis of the ball. As a result, the torque caused by the contact resistance between the inner surface of the pocket and the ball can be easily reduced. As a result, it is possible to provide a ball bearing for automobiles adapted to environmental problems such as improvement in fuel consumption in recent years.

本発明の実施形態で、玉軸受用保持器および玉軸受を示す断面図である。It is sectional drawing which shows the cage for ball bearings and a ball bearing in embodiment of this invention. 本発明の実施形態で、（ａ）はポケットの内面に溝を形成した玉軸受用保持器を示す部分斜視図、（ｂ）は（ａ）の玉軸受用保持器を示す部分展開図である。In the embodiment of the present invention, (a) is a partial perspective view showing a ball bearing cage in which a groove is formed on the inner surface of a pocket, and (b) is a partial development view showing the ball bearing cage of (a). . 本発明の他の実施形態で、（ａ）はポケットの内面にリブを形成した玉軸受用保持器を示す部分斜視図、（ｂ）は（ａ）の玉軸受用保持器を示す部分展開図である。In another embodiment of the present invention, (a) is a partial perspective view showing a ball bearing cage in which ribs are formed on the inner surface of the pocket, and (b) is a partial development view showing the ball bearing cage of (a). It is. 本発明の他の実施形態で、（ａ）はポケットの内面に突起を形成した玉軸受用保持器を示す部分斜視図、（ｂ）は（ａ）の玉軸受用保持器を示す部分展開図である。In another embodiment of the present invention, (a) is a partial perspective view showing a ball bearing cage in which protrusions are formed on the inner surface of the pocket, and (b) is a partial development view showing the ball bearing cage of (a). It is. ポケットの内面に、内径側のポケット開口縁から外径側へ延びる凹みを設けた玉軸受用保持器を示す部分斜視図である。It is a fragmentary perspective view which shows the ball bearing retainer which provided the dent extended from the pocket opening edge of an inner diameter side to the outer diameter side in the inner surface of a pocket. 従来の玉軸受用保持器および玉軸受を示す断面図である。It is sectional drawing which shows the conventional cage for ball bearings and a ball bearing. 従来の玉軸受用保持器で、（ａ）はポケットが形成された玉軸受用保持器を示す部分斜視図、（ｂ）は（ａ）の玉軸受用保持器を示す部分展開図である。In the conventional ball bearing cage, (a) is a partial perspective view showing a ball bearing cage in which a pocket is formed, and (b) is a partial development view showing the ball bearing cage of (a).

本発明に係る玉軸受用保持器および玉軸受の実施形態を以下に詳述する。   Embodiments of a ball bearing retainer and a ball bearing according to the present invention will be described in detail below.

図１に示す実施形態の玉軸受１１は、外径面に内側転走面１２ａが形成された内輪１２と、その内輪１２の外側に配置され、内径面に外側転走面１３ａが形成された外輪１３と、内輪１２の内側転走面１２ａと外輪１３の外側転走面１３ａとの間に転動自在に介在された複数の玉１４と、内輪１２と外輪１３との間に配され、各玉１４を円周方向等間隔に保持する樹脂製の保持器１５とで主要部が構成されている。この外輪１３あるいは内輪１２のいずれか一方がハウジングなどの固定部分に装着され、他方が回転軸などの回転部分に装着される。   The ball bearing 11 of the embodiment shown in FIG. 1 has an inner ring 12 with an inner rolling surface 12a formed on the outer diameter surface, and is arranged outside the inner ring 12, and an outer rolling surface 13a is formed on the inner diameter surface. Arranged between the outer ring 13, a plurality of balls 14 movably interposed between the inner rolling surface 12a of the inner ring 12 and the outer rolling surface 13a of the outer ring 13, and the inner ring 12 and the outer ring 13, The main part is composed of a resin cage 15 that holds the balls 14 at equal intervals in the circumferential direction. Either the outer ring 13 or the inner ring 12 is attached to a fixed part such as a housing, and the other is attached to a rotating part such as a rotating shaft.

この内輪１２と外輪１３との間に配された冠形状の保持器１５は、図２（ａ）（ｂ）に示すように、円環状をなす主部１５ａと、その主部１５ａの軸方向片面に互いに間隔をあけて円周方向等配で一体的に突設された一対ずつの弾性片１５ｂとで構成され、これら一対ずつの弾性片１５ｂの間に凹設されて外径側と内径側とに開口したポケット１５ｃを備え、そのポケット１５ｃで玉１４を転動自在に保持する。   As shown in FIGS. 2 (a) and 2 (b), a crown-shaped cage 15 disposed between the inner ring 12 and the outer ring 13 includes an annular main portion 15a and the axial direction of the main portion 15a. It is composed of a pair of elastic pieces 15b that are integrally protruded at equal intervals in the circumferential direction on one side, and are recessed between the pair of elastic pieces 15b so as to have an outer diameter side and an inner diameter. A pocket 15c opened to the side is provided, and the ball 14 is held by the pocket 15c so as to roll freely.

また、内輪１２と外輪１３の軸方向両側には、図１に示すようにその内輪１２と外輪１３との間の環状空間を密封するためのシール部材１６が配置されている。このシール部材１６は、芯金１６ａとその芯金１６ａに一体的に加硫接着された弾性体１６ｂとからなり、その基端部が外輪１３の内径端部に装着され、先端部が内輪１２の外径端部に接触するシールリップ１６ｃが形成されている。なお、図示の玉軸受１１では、シール部材１６の基端部が装着された外輪１３が固定側であり、シールリップ１６ｃが接触する内輪１２が回転側である。   Further, seal members 16 for sealing an annular space between the inner ring 12 and the outer ring 13 are arranged on both sides in the axial direction of the inner ring 12 and the outer ring 13 as shown in FIG. The seal member 16 includes a metal core 16a and an elastic body 16b integrally vulcanized and bonded to the metal core 16a. A base end portion of the seal member 16 is attached to an inner diameter end portion of the outer ring 13, and a distal end portion is an inner ring 12. A seal lip 16c is formed in contact with the outer diameter end. In the illustrated ball bearing 11, the outer ring 13 on which the base end portion of the seal member 16 is mounted is the fixed side, and the inner ring 12 with which the seal lip 16c contacts is the rotating side.

この玉軸受１１の運転中、シール部材１６の先端のシールリップ１６ｃが内輪１２の外径端部に摺接した状態を維持しながら、内輪１２が回転する。これにより、水やダスト等の異物が軸受内部に侵入したり、あるいは、軸受内部からグリース等の潤滑剤が外部へ漏れたりすることを未然に防止するようにしている。   During the operation of the ball bearing 11, the inner ring 12 rotates while maintaining the state in which the seal lip 16 c at the tip of the seal member 16 is in sliding contact with the outer diameter end of the inner ring 12. This prevents foreign matters such as water and dust from entering the inside of the bearing or leakage of a lubricant such as grease from the inside of the bearing to the outside.

以上で説明した玉軸受１１の保持器１５では、ポケット１５ｃの内面１５ｄと玉１４との接触抵抗を起因とするトルクの低減を図るため、ポケット１５ｃの内面１５ｄに、玉１４との接触位置を玉１４の回転軸に対する玉１４の最大径位置から回転軸方向へずらす凹凸部を設けている。   In the cage 15 of the ball bearing 11 described above, in order to reduce the torque caused by the contact resistance between the inner surface 15d of the pocket 15c and the ball 14, the contact position with the ball 14 is set on the inner surface 15d of the pocket 15c. An uneven portion that is shifted from the maximum diameter position of the ball 14 to the rotation axis direction with respect to the rotation axis of the ball 14 is provided.

図２（ａ）（ｂ）に示す実施形態では、前述した玉１４との接触位置Ｐ1を玉１４の回転軸Ｌに対する玉１４の最大径ｒの位置Ｐ（図８参照）から回転軸方向へずらす凹凸部として、凹状の溝１５ｅを径方向に沿って形成している。この場合、ポケット１５ｃの内面１５ｄと玉１４との接触位置Ｐ1は、ポケット１５ｃの内面１５ｄの溝エッジ部となり、その接触位置Ｐ1を玉１４の回転軸Ｌに対する玉１４の最大径ｒの位置Ｐから回転軸方向へずらすことになる。 In the embodiment shown in FIGS. 2A and 2B, the contact position P 1 with the ball 14 is changed from the position P (see FIG. 8) of the maximum diameter r of the ball 14 to the rotation axis L of the ball 14 in the direction of the rotation axis. A concave groove 15e is formed along the radial direction as the uneven portion to be displaced. In this case, the contact position P 1 and the inner surface 15d and the ball 14 of the pocket 15c becomes a groove edge portion of the inner surface 15d of the pocket 15c, the maximum diameter r of the balls 14 and the contact position P 1 relative to the axis of rotation L of the ball 14 The position P is shifted in the direction of the rotation axis.

ここで、ポケット１５ｃの内面１５ｄと玉１４との接触抵抗Ｒは、摩擦係数をμ、遠心力をＦ、玉１４の重量をｍ、玉１４の回転軸Ｌに対する回転半径をｒ、角速度をωとした場合、Ｒ＝μＦ＝μ・ｍｒω2となる。従って、ポケット１５ｃの内面１５ｄと玉１４との接触位置Ｐ1を玉１４の回転軸Ｌに対する玉１４の最大径ｒの位置Ｐから回転軸方向へずらすことにより、玉１４の回転軸Ｌに対する玉１４の最大径ｒの位置Ｐ（接触位置）での回転半径ｒよりも、玉１４の回転軸Ｌに対する玉１４の最大径ｒの位置Ｐから回転軸方向へずらした場合の接触位置Ｐ1での回転半径ｒ1が小さくなる（ｒ＞ｒ1）。つまり、Ｒ＝μ・ｍｒω2＞Ｒ1＝μ・ｍｒ1ω2となり、回転半径の縮小によって遠心力が小さくなり、接触抵抗が低減する。 Here, the contact resistance R between the inner surface 15d of the pocket 15c and the ball 14 is the friction coefficient μ, the centrifugal force F, the weight of the ball 14 m, the rotation radius of the ball 14 with respect to the rotation axis L, and the angular velocity ω. In this case, R = μF = μ · mrω 2 . Therefore, by shifting the contact position P 1 and the inner surface 15d and the ball 14 of the pocket 15c from the position P of the maximum size r of the ball 14 with respect to the rotation axis L of the ball 14 to the rotary axis direction, the ball relative to the axis of rotation L of the ball 14 14 at a contact position P 1 when shifted from the position P of the maximum diameter r of the ball 14 to the rotation axis L of the ball 14 in the direction of the rotation axis, rather than the rotation radius r at the position P (contact position) of the maximum diameter r of 14. rotation radius r 1 is small (r> r 1). That is, R = μ · mrω 2 > R 1 = μ · mr 1 ω 2 , and the centrifugal force is reduced by reducing the rotation radius, and the contact resistance is reduced.

以上のことから、ポケット１５ｃの内面１５ｄに溝１５ｅを径方向に沿って形成することにより、ポケット１５ｃの内面１５ｄと玉１４との接触位置Ｐ1を玉１４の回転軸Ｌに対する玉１４の最大径ｒの位置Ｐから回転軸方向へずらすことで、ポケット１５ｃの内面１５ｄと玉１４との接触抵抗を、ポケット１５ｃの内面１５ｄと玉１４との接触位置が玉１４の回転軸Ｌに対する玉１４の最大径ｒの位置Ｐとなる場合よりも小さくすることができる。その結果、このポケット１５ｃの内面１５ｄと玉１４との接触抵抗を起因とするトルクの低減を図ることが容易となる。 Up From the above, by forming along the groove 15e in the radial direction on the inner surface 15d of the pocket 15c, the balls 14 contact position P 1 and the inner surface 15d and the ball 14 of the pocket 15c with respect to the rotation axis L of the ball 14 The contact resistance between the inner surface 15d of the pocket 15c and the ball 14 is shifted from the position P of the diameter r in the rotation axis direction, and the contact position between the inner surface 15d of the pocket 15c and the ball 14 is the ball 14 with respect to the rotation axis L of the ball 14. It can be made smaller than the case where the position P is the maximum diameter r. As a result, it becomes easy to reduce the torque due to the contact resistance between the inner surface 15d of the pocket 15c and the ball 14.

以上の実施形態では、玉１４との接触位置Ｐ1を玉１４の回転軸Ｌに対する玉１４の最大径ｒの位置Ｐから回転軸方向へずらす凹凸部として、凹状の溝１５ｅを径方向に沿って形成した場合について説明したが、本発明はこれに限定されることなく、以下に詳述する他の実施形態でも可能である。 In the above embodiments, a concave-convex portion to shift the contact position P 1 between the ball 14 from the position P of the maximum size r of the ball 14 with respect to the rotation axis L of the ball 14 to the rotary axis direction, along the concave groove 15e in the radial direction However, the present invention is not limited to this, and other embodiments described in detail below are possible.

図３（ａ）（ｂ）に示す実施形態では、玉１４との接触位置Ｐ1を玉１４の回転軸Ｌに対する玉１４の最大径ｒの位置Ｐから回転軸方向へずらす凹凸部として、突条のリブ１５ｆを径方向に沿って形成している。この場合、ポケット１５ｃの内面１５ｄと玉１４との接触位置Ｐ1は、ポケット１５ｃの内面１５ｄに形成されたリブ１５ｆとなり、その接触位置Ｐ1を玉１４の回転軸Ｌに対する玉１４の最大径ｒの位置Ｐから回転軸方向へずらす。これにより、玉１４の回転半径が縮小して遠心力が小さくなることで、ポケット１５ｃの内面１５ｄと玉１４との接触抵抗を、ポケット１５ｃの内面１５ｄと玉１４との接触位置が玉１４の回転軸Ｌに対する玉１４の最大径ｒの位置Ｐとなる場合よりも小さくすることができる。その結果、このポケット１５ｃの内面１５ｄと玉１４との接触抵抗を起因とするトルクの低減を図ることが容易となる。 In the embodiment shown in FIG. 3 (a) (b), as uneven portion to shift the contact position P 1 between the ball 14 from the position P of the maximum size r of the ball 14 with respect to the rotation axis L of the ball 14 to the rotary axis direction, butt The ribs 15f of the strip are formed along the radial direction. In this case, the contact position P 1 and the inner surface 15d and the ball 14 of the pocket 15c is next to the ribs 15f formed on the inner surface 15d of the pocket 15c, the maximum diameter of the balls 14 and the contact position P 1 relative to the axis of rotation L of the ball 14 Shift from the position P of r in the direction of the rotation axis. Thereby, the rotational radius of the ball 14 is reduced and the centrifugal force is reduced, so that the contact resistance between the inner surface 15d of the pocket 15c and the ball 14 is reduced, and the contact position between the inner surface 15d of the pocket 15c and the ball 14 is This can be made smaller than when the position P is the maximum diameter r of the ball 14 with respect to the rotation axis L. As a result, it becomes easy to reduce the torque due to the contact resistance between the inner surface 15d of the pocket 15c and the ball 14.

なお、リブ１５ｆは、径方向に沿って二条で形成されている。これにより、玉１４がポケット１５ｃの内面１５ｄと軸方向で二点接触することになり、玉１４を転動自在に保持する上で玉１４の姿勢を安定させることができる。   Note that the rib 15f is formed in two strips along the radial direction. As a result, the ball 14 comes into contact with the inner surface 15d of the pocket 15c at two points in the axial direction, and the posture of the ball 14 can be stabilized when the ball 14 is held to roll.

図４（ａ）（ｂ）に示す実施形態では、玉１４との接触位置Ｐ1を玉１４の回転軸Ｌに対する玉１４の最大径ｒの位置Ｐから回転軸方向へずらす凹凸部として、複数の突起１５ｇを径方向に沿って配設している。この場合、ポケット１５ｃの内面１５ｄと玉１４との接触位置Ｐ1は、ポケット１５ｃの内面１５ｄに形成された突起１５ｇとなり、その接触位置Ｐ1を玉１４の回転軸Ｌに対する玉１４の最大径ｒの位置Ｐから回転軸方向へずらす。これにより、玉１４の回転半径が縮小して遠心力が小さくなることで、ポケット１５ｃの内面１５ｄと玉１４との接触抵抗を、ポケット１５ｃの内面１５ｄと玉１４との接触位置が玉１４の回転軸Ｌに対する玉１４の最大径ｒの位置Ｐとなる場合よりも小さくすることができる。その結果、このポケット１５ｃの内面１５ｄと玉１４との接触抵抗を起因とするトルクの低減を図ることが容易となる。 In the embodiment shown in FIGS. 4 (a) and 4 (b), a plurality of concave and convex portions that shift the contact position P 1 with the ball 14 from the position P of the maximum diameter r of the ball 14 with respect to the rotation axis L of the ball 14 in the direction of the rotation axis. The protrusions 15g are arranged along the radial direction. In this case, the contact position P 1 and the inner surface 15d and the ball 14 of the pocket 15c, the projection 15g next formed on the inner surface 15d of the pocket 15c, the maximum diameter of the balls 14 and the contact position P 1 relative to the axis of rotation L of the ball 14 Shift from the position P of r in the direction of the rotation axis. Thereby, the rotational radius of the ball 14 is reduced and the centrifugal force is reduced, so that the contact resistance between the inner surface 15d of the pocket 15c and the ball 14 is reduced, and the contact position between the inner surface 15d of the pocket 15c and the ball 14 is It can be made smaller than when the position P is the maximum diameter r of the ball 14 with respect to the rotation axis L. As a result, it becomes easy to reduce the torque due to the contact resistance between the inner surface 15d of the pocket 15c and the ball 14.

なお、突起１５ｇは、径方向に沿って二列で形成されている。これにより、玉１４がポケット１５ｃの内面１５ｄと軸方向で二点接触することになり、玉１４を転動自在に保持する上で玉１４の姿勢を安定させることができる。   The protrusions 15g are formed in two rows along the radial direction. As a result, the ball 14 comes into contact with the inner surface 15d of the pocket 15c at two points in the axial direction, and the posture of the ball 14 can be stabilized when the ball 14 is held to roll.

以上で説明した各実施形態では、凹凸部としての溝１５ｅ、リブ１５ｆおよび突起１５ｇをポケット１５ｃの内面１５ｄの円周方向両側に設けた場合について説明したが、溝１５ｅ、リブ１５ｆおよび突起１５ｇをポケット１５ｃの内面１５ｄの円周方向片側のみに形成するようにしてもよい。   In each of the embodiments described above, the case where the grooves 15e, the ribs 15f, and the protrusions 15g as the uneven portions are provided on both sides in the circumferential direction of the inner surface 15d of the pocket 15c has been described, but the grooves 15e, the ribs 15f, and the protrusions 15g are provided. You may make it form only in the circumferential direction one side of the inner surface 15d of the pocket 15c.

このように、溝１５ｅ、リブ１５ｆおよび突起１５ｇをポケット１５ｃの内面１５ｄの円周方向片側のみに形成した場合であっても、その円周方向片側での玉１４との接触位置Ｐ1を玉１４の回転軸Ｌに対する玉１４の最大径ｒの位置Ｐから回転軸方向へずらすことで、ポケット１５ｃの内面１５ｄと玉１４との接触抵抗を、ポケット１５ｃの内面１５ｄと玉１４との接触位置が玉１４の回転軸Ｌに対する玉１４の最大径ｒの位置Ｐとなる場合よりも小さくすることができる。その結果、このポケット１５ｃの内面１５ｄと玉１４との接触抵抗を起因とするトルクの低減を図ることが容易となる。 Thus, the grooves 15e, even if the rib 15f and the projections 15g in a case where it is formed only in the circumferential direction on one side of the inner surface 15d of the pocket 15c, the ball contact position P 1 of the balls 14 in the circumferential direction on one side 14, the contact resistance between the inner surface 15 d of the pocket 15 c and the ball 14 is changed to the contact position between the inner surface 15 d of the pocket 15 c and the ball 14. Can be made smaller than when the maximum diameter r of the ball 14 is at the position P with respect to the rotational axis L of the ball 14. As a result, it becomes easy to reduce the torque due to the contact resistance between the inner surface 15d of the pocket 15c and the ball 14.

前述の各実施形態で説明した凹凸部としての溝１５ｅ、リブ１５ｆおよび突起１５ｇは、保持器１５を射出成形により製作した後に切削加工により形成することが可能であり、あるいは、保持器１５を射出成形により製作すると同時に形成することも可能である。このように切削加工あるいは射出成形により溝１５ｅ、リブ１５ｆおよび突起１５ｇを形成することにより、それら溝１５ｅ、リブ１５ｆおよび突起１５ｇを容易に形成することができてコスト低減が図れる。   The grooves 15e, the ribs 15f, and the projections 15g as the concavo-convex portions described in the above embodiments can be formed by cutting after the cage 15 is manufactured by injection molding, or the cage 15 is injected. It is also possible to form simultaneously with manufacturing by molding. By forming the grooves 15e, the ribs 15f, and the protrusions 15g by cutting or injection molding in this way, the grooves 15e, the ribs 15f, and the protrusions 15g can be easily formed, and the cost can be reduced.

また、図５は、図２（ａ）（ｂ）に示す実施形態における保持器１５のポケット１５ｃの内面１５ｄに、内径側のポケット開口縁から外径側へ延びる凹み１５ｈを形成した実施形態を示す。この実施形態のようにポケット１５ｃの内面１５ｄに、内径側のポケット開口縁から外径側へ延びる凹み１５ｈを形成することにより、玉１４に付着しているグリースを保持器１５の内径面で掻き取る量が減少する。これにより、内輪１２の外径部へのグリース付着を防止することができるので、内輪１２のシール溝へのグリースの流動を防止でき、結果として玉軸受１１からのグリース漏れを防止できる。   FIG. 5 shows an embodiment in which a recess 15h extending from the pocket opening edge on the inner diameter side to the outer diameter side is formed on the inner surface 15d of the pocket 15c of the cage 15 in the embodiment shown in FIGS. 2 (a) and 2 (b). Show. As in this embodiment, the inner surface 15d of the pocket 15c is formed with a recess 15h extending from the pocket opening edge on the inner diameter side toward the outer diameter side, so that the grease adhering to the ball 14 is scraped off by the inner diameter surface of the cage 15. The amount to take decreases. As a result, it is possible to prevent the grease from adhering to the outer diameter portion of the inner ring 12, thereby preventing the grease from flowing into the seal groove of the inner ring 12, and as a result, preventing grease leakage from the ball bearing 11.

なお、図５に示す実施形態は、図２（ａ）（ｂ）に示す実施形態に適用した場合について説明したが、図３（ａ）（ｂ）および図４（ａ）（ｂ）に示す他の実施形態にも適用可能である。   In addition, although embodiment shown in FIG. 5 demonstrated the case where it applied to embodiment shown to FIG. 2 (a) (b), it shows to FIG. 3 (a) (b) and FIG. 4 (a) (b). The present invention can be applied to other embodiments.

本発明は前述した実施形態に何ら限定されるものではなく、本発明の要旨を逸脱しない範囲内において、さらに種々なる形態で実施し得ることは勿論のことであり、本発明の範囲は、特許請求の範囲によって示され、さらに特許請求の範囲に記載の均等の意味、および範囲内のすべての変更を含む。   The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. It includes the equivalent meanings recited in the claims, and the equivalent meanings recited in the claims, and all modifications within the scope.

１１ 玉軸受
１２ 内輪
１３ 外輪
１４ 玉
１５ 保持器
１５ｃ ポケット
１５ｄ ポケットの内面
１５ｅ 凹凸部（溝）
１５ｆ 凹凸部（リブ）
１５ｇ 凹凸部（突起）
１５ｈ 凹み
Ｌ 回転軸
Ｐ 最大径位置
Ｐ1 接触位置 DESCRIPTION OF SYMBOLS 11 Ball bearing 12 Inner ring 13 Outer ring 14 Ball 15 Cage 15c Pocket 15d Pocket inner surface 15e Concavity and convexity (groove)
15f Irregularities (ribs)
15g Concavity and convexity (protrusion)
15h Recess L Rotating shaft P Maximum diameter position P 1 Contact position

Claims (11)

全体を円環状に形成してその円周方向複数箇所にそれぞれが外径側と内径側とに開口したポケットを有し、前記ポケットで玉を転動自在に保持する冠形状の玉軸受用保持器であって、前記ポケットの内面に、前記玉との接触位置を玉の回転軸に対する玉の最大径位置から回転軸方向へずらす凹凸部を設けたことを特徴とする玉軸受用保持器。   A crown-shaped ball bearing holder that has an annular shape as a whole and has pockets that are open to the outer diameter side and inner diameter side at a plurality of locations in the circumferential direction. A ball bearing retainer, wherein a concave and convex portion is provided on the inner surface of the pocket to shift the contact position with the ball from the maximum diameter position of the ball relative to the rotation axis of the ball toward the rotation axis. 前記凹凸部は、径方向に沿って形成された溝である請求項１に記載の玉軸受用保持器。   The ball bearing retainer according to claim 1, wherein the uneven portion is a groove formed along a radial direction. 前記凹凸部は、径方向に沿って形成されたリブである請求項１又は２に記載の玉軸受用保持器。   The ball bearing retainer according to claim 1, wherein the uneven portion is a rib formed along a radial direction. 前記リブは、径方向に沿って二条で形成されている請求項３に記載の玉軸受用保持器。   The ball bearing retainer according to claim 3, wherein the rib is formed in two lines along a radial direction. 前記凹凸部は、径方向に沿って配設された複数の突起である請求項１又は２に記載の玉軸受用保持器。   The ball bearing retainer according to claim 1, wherein the uneven portion is a plurality of protrusions arranged along a radial direction. 前記突起は、径方向に沿って二列で形成されている請求項５に記載の玉軸受用保持器。   The ball bearing retainer according to claim 5, wherein the protrusions are formed in two rows along a radial direction. 前記凹凸部は、ポケットの内面の少なくとも円周方向片側に形成されている請求項１〜６のいずれか一項に記載の玉軸受用保持器。   The ball bearing retainer according to any one of claims 1 to 6, wherein the uneven portion is formed on at least one circumferential direction of the inner surface of the pocket. 前記凹凸部は、切削加工により形成されている請求項１〜７のいずれか一項に記載の玉軸受用保持器。   The said uneven | corrugated | grooved part is the ball bearing retainer as described in any one of Claims 1-7 currently formed by cutting. 前記凹凸部は、射出成形により形成されている請求項１〜７のいずれか一項に記載の玉軸受用保持器。   The ball bearing retainer according to any one of claims 1 to 7, wherein the uneven portion is formed by injection molding. 前記ポケットの内面に、内径側のポケット開口縁から外径側へ延びる凹みを形成した請求項１〜９のいずれか一項に記載の玉軸受用保持器。   The ball bearing retainer according to any one of claims 1 to 9, wherein a recess extending from a pocket opening edge on an inner diameter side toward an outer diameter side is formed on an inner surface of the pocket. 請求項１〜１０のいずれか一項に記載の保持器と、互いに相対回転する外輪および内輪と、前記外輪と内輪との間に介在する玉とを備えた玉軸受。   A ball bearing comprising the cage according to claim 1, an outer ring and an inner ring that rotate relative to each other, and a ball that is interposed between the outer ring and the inner ring.
JP2009126733A 2009-05-26 2009-05-26 Retainer for ball bearing and ball bearing Withdrawn JP2010276052A (en)

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PCT/JP2010/057345 WO2010137434A1 (en) 2009-05-26 2010-04-26 Ball bearing retainer and ball bearing

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