JP2011085165A - Rolling bearing for electrical auxiliary machine of automobile - Google Patents

Rolling bearing for electrical auxiliary machine of automobile Download PDF

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Publication number
JP2011085165A
JP2011085165A JP2009236886A JP2009236886A JP2011085165A JP 2011085165 A JP2011085165 A JP 2011085165A JP 2009236886 A JP2009236886 A JP 2009236886A JP 2009236886 A JP2009236886 A JP 2009236886A JP 2011085165 A JP2011085165 A JP 2011085165A
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Japan
Prior art keywords
pocket
rolling
diameter side
cage
rolling bearing
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JP2009236886A
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Japanese (ja)
Inventor
Tomokazu Nakagawa
友和 中川
Yasuyuki Katayama
康行 片山
Kenta Sakaguchi
健太 坂口
Takahiro Wakuta
貴裕 和久田
Makoto Muramatsu
誠 村松
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2009236886A priority Critical patent/JP2011085165A/en
Publication of JP2011085165A publication Critical patent/JP2011085165A/en
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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
    • F16C33/412—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
    • F16C33/416—Massive or moulded comb cages, e.g. snap ball cages formed as one-piece cages, i.e. monoblock comb cages made from plastic, e.g. injection moulded 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
    • 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
    • F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
    • F16C33/6629—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
    • F16C19/02—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

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To readily reduce torque resulted from shearing resistance of oil by balls. <P>SOLUTION: A rolling bearing for electrical auxiliary machines of an automobile includes an inner ring 12 formed with an inner rolling face 12a on the outer peripheral surface, an outer ring 13 arranged outside the inner ring 12 and formed with an outer rolling face 13a on the inner peripheral surface, the plurality of balls 14 interposed to freely roll between the inner rolling face 12a of the inner ring 12 and the outer rolling face 13a of the outer ring 13, and a cage 15 arranged between the inner ring 12 and the outer ring 13 and holding the balls 14. The rolling bearing rotatably supports a rotating shaft rotatively driven by engine output on a stationary member. The cage 15 is formed in a ring shape as a whole and has, at a plurality of places in the circumferential direction, recessed pockets 15c each opened to the outer diameter side and the inner diameter side and receiving the ball 14. Thickness reduction portions 15e, 15f are formed in the pocket inner surface for reducing a facing area between the pocket 15c and the ball 14. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、自動車の電装部品や補機部品に組み込まれ、転動体を転動自在に保持する樹脂製の保持器を具備した自動車電装補機用転がり軸受に関する。   The present invention relates to a rolling bearing for an automotive electrical accessory equipped with a resin cage that is incorporated in an electrical component or an accessory component of an automobile and holds a rolling element in a freely rolling manner.

自動車の電装部品や補機部品、例えばファンカップリング装置、オルタネータ、アイドラプーリ、カーエアコン用電磁クラッチ、電動ファンモータ等に組み込まれる転がり軸受としては、エンジン出力で回転駆動する回転軸を静止部材に回転自在に支持するために、図１５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）。   As rolling bearings incorporated in automobile electrical parts and auxiliary parts such as fan coupling devices, alternators, idler pulleys, car air conditioner electromagnetic clutches, electric fan motors, etc., the rotating shaft that is driven to rotate by the engine output is used as a stationary member. In order to support it rotatably, a ball bearing 1 as shown in FIG. 15 is widely used (see, for example, Patent Document 1).

この種の玉軸受１は、同図に示すように外周面に内側転走面２ａが形成された内輪２と、その内輪２の外側に配置され、内周面に外側転走面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静止部材に装着され、他方がエンジン出力で回転駆動する回転軸に装着される。   As shown in the figure, this type of ball bearing 1 is disposed on the outer circumference of an inner ring 2 having an inner rolling surface 2a formed on the outer peripheral surface, and on the outer side of the inner ring 2, and an outer rolling surface 3a is formed on the inner circumferential 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 mounted on a stationary member such as a housing, and the other is mounted on a rotating shaft that is driven to rotate by engine output.

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１６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凹状のポケット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 FIG. 16, the crown-shaped cage 5 disposed between the inner ring 2 and the outer ring 3 is spaced apart from the main part 5a having an annular shape and one axial surface of the main part 5a. And a pair of elastic pieces 5b that protrude integrally in the circumferential direction and are recessed between the pair of elastic pieces 5b and open to the outer diameter side and the inner diameter side. Pocket 5c, and the ball 4 is movably held in the pocket 5c.

また、図１５に示すように、内輪２と外輪３の軸方向両側には、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の内周端部に装着され、先端部が内輪２の外周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, as shown in FIG. 15, seal members 6 for sealing an annular space between the inner ring 2 and the outer ring 3 are disposed on both sides in the axial direction of the inner ring 2 and the outer ring 3. The seal member 6 includes a cored bar 6a and an elastic body 6b integrally vulcanized and bonded to the cored bar 6a. A base end portion of the seal member 6 is attached to an inner peripheral end of the outer ring 3, and a distal end is an inner ring. A seal lip 6c is formed in contact with the outer peripheral end portion of 2. 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の外周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 in which the seal lip 6 c at the tip of the seal member 6 is in sliding contact with the outer peripheral 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１の保持器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いる。また、保持器５を構成する主部５ａおよび弾性片５ｂにおける保持器径方向寸法、つまり、主部５ａおよび弾性片５ｂの厚みｔ（図１５参照）がポケット底部側からポケット先端部側（弾性片側）まで均一な形状となっている。   By the way, in the cage 5 of the ball bearing 1 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. Further, the cage radial direction dimensions of the main portion 5a and the elastic piece 5b constituting the cage 5, that is, the thickness t (see FIG. 15) of the main portion 5a and the elastic piece 5b is changed from the pocket bottom side to the pocket tip side (elasticity). Uniform shape up to one side).

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、玉による油（グリース等の潤滑剤）の剪断抵抗が多くの割合を占めている。また、その剪断抵抗のほとんどがポケット５ｃの内面５ｄとそのポケット５ｃに収容された玉４との間に形成された油膜を剪断する時に発生するものである。   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 shear resistance of oil (lubricant such as grease) by the ball accounts for a large proportion. Most of the shear resistance is generated when the oil film formed between the inner surface 5d of the pocket 5c and the ball 4 accommodated in the pocket 5c is sheared.

従来の玉軸受１の保持器５では、主部５ａおよび弾性片５ｂの厚みｔ（図１５参照）がポケット底部側からポケット先端部側（弾性片側）まで均一であるため、ポケット５ｃの玉４との対向面積もポケット底部側からポケット先端部側（弾性片側）まで均一となっていることから、ポケット５ｃで大きな剪断抵抗が発生することにより玉軸受１のトルクを低減させることが困難であった。   In the cage 5 of the conventional ball bearing 1, since the thickness t (see FIG. 15) of the main portion 5a and the elastic piece 5b is uniform from the pocket bottom side to the pocket tip side (elastic piece side), the ball 4 in the pocket 5c. Is also uniform from the pocket bottom side to the pocket tip side (elastic one side), and it is difficult to reduce the torque of the ball bearing 1 by generating a large shear resistance in the pocket 5c. It was.

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、玉による油の剪断抵抗を起因とするトルクを容易に低減させ得る自動車電装補機用転がり軸受を提供することにある。   Therefore, the present invention has been proposed in view of the above-described problems, and the object of the present invention is to provide a rolling bearing for an automotive electrical equipment that can easily reduce torque caused by oil shear resistance by balls. It is to provide.

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、外周面に内側転走面が形成された内輪と、その内輪の外側に配置され、内周面に外側転走面が形成された外輪と、内輪の内側転走面と外輪の外側転走面との間に転動自在に介在した複数の転動体と、内輪と外輪との間に配され、転動体を保持する保持器とを備え、エンジン出力で回転駆動する回転軸を静止部材に回転自在に支持する自動車電装補機用転がり軸受であって、保持器は、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て転動体を収容する凹状のポケットを有し、ポケットの転動体との対向面積を低減する減肉部をポケット内面に形成したことを特徴とする。   As technical means for achieving the above-mentioned object, the present invention includes an inner ring having an inner rolling surface formed on the outer peripheral surface, and an outer rolling surface formed on the inner peripheral surface. The outer ring, a plurality of rolling elements interposed between the inner rolling surface of the inner ring and the outer rolling surface of the outer ring, and a cage that is arranged between the inner ring and the outer ring and holds the rolling elements. A rolling bearing for an automotive electrical accessory that rotatably supports a rotating shaft that is rotationally driven by engine output on a stationary member, and the cage is formed in an annular shape as a whole, and is provided at a plurality of locations in the circumferential direction. Each of which has a concave pocket that opens to the outer diameter side and the inner diameter side and accommodates the rolling elements, and a reduced thickness portion that reduces the area of the pocket facing the rolling elements is formed on the inner surface of the pocket. To do.

本発明に係る自動車電装補機用転がり軸受では、ポケットの転動体との対向面積を低減する減肉部をポケット内面に形成した保持器を具備したことにより、ポケットの内面とそのポケットに収容された転動体との間に形成される油膜量を従来よりも少なくすることができることから、油膜を剪断する時に発生する剪断抵抗を従来よりも低減することができる。その結果、この転動体による油の剪断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 rolling bearing for automotive electrical equipment according to the present invention, the inner surface of the pocket and the pocket are accommodated in the pocket by providing the cage with the thinned portion formed on the inner surface of the pocket to reduce the area of the pocket facing the rolling element. Since the amount of oil film formed between the rolling element and the rolling element can be made smaller than before, the shear resistance generated when the oil film is sheared can be reduced more than before. As a result, it is possible to easily reduce the torque caused by the oil shear resistance by the rolling elements.

本発明における保持器の減肉部は、ポケット先端部の外径側あるいは内径側の少なくとも一方に形成されていることが望ましい。このようにすれば、ポケット先端部において転動体による油の剪断抵抗を起因として発生するトルクを低減することが可能となる。   The thinned portion of the cage in the present invention is preferably formed on at least one of the outer diameter side and the inner diameter side of the pocket tip. If it does in this way, it will become possible to reduce the torque which arises due to the shear resistance of the oil by a rolling element in a pocket tip part.

本発明における保持器の減肉部は、ポケット底部の外径側あるいは内径側の少なくとも一方に形成されていることが望ましい。このようにすれば、ポケット底部において転動体による油の剪断抵抗を起因として発生するトルクを低減することが可能となる。   The thinned portion of the cage in the present invention is preferably formed on at least one of the outer diameter side or the inner diameter side of the pocket bottom. If it does in this way, it will become possible to reduce the torque which arises due to the shear resistance of the oil by a rolling element in a pocket bottom.

本発明における保持器の減肉部は、ポケット内面に形成された凹部とすることも可能である。このようにすれば、ポケット内面の凹部形成部位において転動体による油の剪断抵抗を起因として発生するトルクを低減することが可能となる。   The thinned portion of the cage in the present invention can be a recess formed on the inner surface of the pocket. If it does in this way, it will become possible to reduce the torque which arises due to the shear resistance of the oil by a rolling element in the crevice formation part of a pocket inner surface.

この凹部は、ポケット内面の円周方向全周に亘って溝状に形成したり、あるいは、ポケット内面の保持器軸方向に貫通して形成したりすればよい。このようにすれば、凹部を容易に形成することが可能となる。   The recess may be formed in a groove shape over the entire circumference in the circumferential direction of the pocket inner surface, or may be formed so as to penetrate in the cage axial direction of the pocket inner surface. In this way, the concave portion can be easily formed.

本発明における凹部は、ポケット内面の保持器径方向に亘って複数条に形成されていることが望ましい。このようにすれば、ポケット内面の凹部形成部位において転動体による油の剪断抵抗を起因として発生するトルクをより一層低減することができる。   It is desirable that the concave portions in the present invention are formed in a plurality of strips across the radial direction of the cage inside the pocket. In this way, it is possible to further reduce the torque generated due to the shearing resistance of the oil by the rolling elements at the recessed portion forming portion on the inner surface of the pocket.

本発明によれば、ポケットの転動体との対向面積を低減する減肉部をポケット内面に形成した保持器を具備したことにより、ポケットの内面とそのポケットに収容された転動体との間に形成された油膜量を従来よりも少なくすることができることから、油膜を剪断する時に発生する剪断抵抗を従来よりも低減することができる。その結果、この転動体による油の剪断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転がり軸受を容易に提供できる。   According to the present invention, the cage having the thinned portion formed on the inner surface of the pocket for reducing the area of the pocket facing the rolling element is provided between the inner surface of the pocket and the rolling element accommodated in the pocket. Since the amount of the formed oil film can be made smaller than before, the shear resistance generated when the oil film is sheared can be reduced more than before. As a result, it is possible to easily reduce the torque caused by the oil shear resistance by the rolling elements. As a result, it is possible to easily provide a rolling bearing for automobiles adapted to environmental problems such as fuel efficiency improvement in recent years.

本発明に係る自動車電装補機用転がり軸受の実施形態で、ポケット先端部の内径側とポケット底部の外径側に減肉部を形成した玉軸受を示す断面図である。It is sectional drawing which shows the ball bearing which formed the thinning part in the inner diameter side of a pocket front-end | tip part, and the outer-diameter side of a pocket bottom part in embodiment of the rolling bearing for motor vehicle electrical accessory which concerns on this invention. 図１の保持器を示す部分斜視図である。It is a fragmentary perspective view which shows the holder | retainer of FIG. 本発明の他の実施形態で、ポケット先端部の外径側とポケット底部の内径側に減肉部を形成した玉軸受を示す断面図である。It is sectional drawing which shows the ball bearing which formed the thinning part in the outer diameter side of a pocket front-end | tip part, and the inner diameter side of a pocket bottom part by other embodiment of this invention. 図３の保持器を示す部分斜視図である。It is a fragmentary perspective view which shows the holder | retainer of FIG. 本発明の他の実施形態で、減肉部として溝状の凹部をポケットの内面に形成した玉軸受を示す断面図である。In other embodiment of this invention, it is sectional drawing which shows the ball bearing which formed the groove-shaped recessed part in the inner surface of the pocket as a thinning part. 図５の保持器を示す部分斜視図である。It is a fragmentary perspective view which shows the holder | retainer of FIG. 図５の保持器を示す部分展開図である。It is a partial expanded view which shows the holder | retainer of FIG. 本発明の他の実施形態で、減肉部として溝状の凹部をポケットの内面に貫通させて形成した玉軸受を示す断面図である。In other embodiment of this invention, it is sectional drawing which shows the ball bearing formed by making a groove-shaped recessed part penetrate the inner surface of a pocket as a thinning part. 図８の保持器を示す部分斜視図である。It is a fragmentary perspective view which shows the holder | retainer of FIG. 図８の保持器を示す部分展開図である。It is a partial expanded view which shows the holder | retainer of FIG. 本発明の転がり軸受を適用する自動車用オルタネータの概略構成を示す断面図である。It is sectional drawing which shows schematic structure of the alternator for motor vehicles which applies the rolling bearing of this invention. 実施例におけるトルク比較試験の試験条件を示す表である。It is a table | surface which shows the test conditions of the torque comparison test in an Example. 実施例におけるトルク比較試験の試験結果を示す表である。It is a table | surface which shows the test result of the torque comparison test in an Example. 実施例におけるトルク比較試験の試験結果を示すグラフである。It is a graph which shows the test result of the torque comparison test in an Example. 従来の自動車電装補機用転がり軸受を例示する玉軸受を示す断面図である。It is sectional drawing which shows the ball bearing which illustrates the conventional rolling bearing for automotive electrical equipment auxiliary machines. 図１５の保持器を示す部分斜視図である。It is a fragmentary perspective view which shows the holder | retainer of FIG.

本発明に係る自動車電装補機用転がり軸受の実施形態を以下に詳述する。なお、以下の実施形態では、自動車用オルタネータに組み込まれ、エンジン出力で回転駆動する回転軸を静止部材に回転自在に支持する玉軸受を例示するが、例えばファンカップリング装置、アイドラプーリ、カーエアコン用電磁クラッチ、電動ファンモータ等、自動車の他の電装部品や補機部品にも適用可能である。   An embodiment of a rolling bearing for automobile electrical accessory according to the present invention will be described in detail below. In the following embodiments, ball bearings that are incorporated in an automobile alternator and that rotatably support a rotating shaft that is driven to rotate by engine output are supported by a stationary member. For example, a fan coupling device, an idler pulley, a car air conditioner It can also be applied to other electric parts and auxiliary parts of automobiles such as electromagnetic clutches and electric fan motors.

図１に示す実施形態の玉軸受１１は、外周面に内側転走面１２ａが形成された内輪１２と、その内輪１２の外側に配置され、内周面に外側転走面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転動体である玉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静止部材に装着され、他方がエンジン出力で回転駆動する回転軸に装着される。   The ball bearing 11 of the embodiment shown in FIG. 1 is arranged on the outer circumference of an inner ring 12 having an inner raceway surface 12a formed on the outer peripheral surface, and an outer raceway surface 13a is formed on the inner circumference surface. Between the outer ring 13, the balls 14 which are a plurality of rolling elements interposed between the inner rolling surface 12 a of the inner ring 12 and the outer rolling surface 13 a of the outer ring 13, and between the inner ring 12 and the outer ring 13. And a resin retainer 15 that holds the balls 14 at equal intervals in the circumferential direction. Either the outer ring 13 or the inner ring 12 is mounted on a stationary member such as a housing, and the other is mounted on a rotating shaft that is driven to rotate by engine output.

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凹状のポケット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 FIG. 2, the crown-shaped cage 15 disposed between the inner ring 12 and the outer ring 13 is spaced apart from the main part 15 a having an annular shape and one axial surface of the main part 15 a. And a pair of elastic pieces 15b that are integrally projected in the circumferential direction and are recessed between the pair of elastic pieces 15b and open to the outer diameter side and the inner diameter side. Pocket 15c, and the ball 15 is movably held in the pocket 15c.

また、図１に示すように、内輪１２と外輪１３の軸方向両側には、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の内周端部に装着され、先端部が内輪１２の外周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。   As shown in FIG. 1, 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. 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 peripheral end portion of the outer ring 13, and a distal end portion is an inner ring. A seal lip 16c is formed in contact with the outer peripheral end portion of 12. 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の外周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 where the seal lip 16 c at the tip of the seal member 16 is in sliding contact with the outer peripheral 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は、図１１に示す自動車用オルタネータに使用される。このオルタネータは、エンジンの回転をベルトで受けて発電し、車両の電気負荷に電力を供給すると共にバッテリを充電する機能を有する。オルタネータは、同図に示すように静止部材であるハウジング２１に、ロータ２２を装着したローラ回転軸２３が玉軸受１１で回転自在に支持されている。ロータ２２にはロータコイル２４が取り付けられ、ロータ２２の外周に配置されたステータ２５には、１２０°の位相で３巻のステータコイル２６が取り付けられている。ロータ回転軸２３は、その先端に取り付けられたプーリ２７にベルト（図示せず）で伝達される回転トルクで回転駆動されている。   The ball bearing 11 described above is used in the automotive alternator shown in FIG. This alternator has a function of generating power by receiving rotation of the engine with a belt, supplying electric power to an electric load of the vehicle, and charging a battery. In the alternator, a roller rotating shaft 23 having a rotor 22 mounted thereon is rotatably supported by a ball bearing 11 on a housing 21 that is a stationary member, as shown in FIG. A rotor coil 24 is attached to the rotor 22, and a three-turn stator coil 26 is attached to a stator 25 disposed on the outer periphery of the rotor 22 with a phase of 120 °. The rotor rotating shaft 23 is rotationally driven with a rotational torque transmitted by a belt (not shown) to a pulley 27 attached to the tip of the rotor rotating shaft 23.

このオルタネータに組み込まれる玉軸受１１の保持器１５では、ポケット１５ｃの内面１５ｄとそのポケット１５ｃに収容された玉１４との間に形成された油膜を剪断する時に発生する剪断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、ポケット１５ｃの玉１４との対向面積を低減する減肉部を設けている。   In the cage 15 of the ball bearing 11 incorporated in the alternator, torque caused by shear resistance generated when the oil film formed between the inner surface 15d of the pocket 15c and the ball 14 accommodated in the pocket 15c is sheared. In order to reduce the thickness of the pocket 15c, the inner surface 15d of the pocket 15c is provided with a thinned portion that reduces the area of the pocket 15c facing the ball 14.

図１および図２に示す実施形態では、保持器１５の減肉部１５ｅ，１５ｆを、ポケット先端部（弾性片側）の内径側とポケット底部の外径側を切り欠くことにより形成している。また、図３および図４に示す実施形態では、保持器１５の減肉部１５ｇ，１５ｈを、ポケット先端部（弾性片側）の外径側とポケット底部の内径側を切り欠くことにより形成している。   In the embodiment shown in FIGS. 1 and 2, the thinned portions 15e and 15f of the cage 15 are formed by cutting out the inner diameter side of the pocket tip (elastic piece side) and the outer diameter side of the pocket bottom. Further, in the embodiment shown in FIGS. 3 and 4, the thinned portions 15g and 15h of the cage 15 are formed by cutting out the outer diameter side of the pocket tip (elastic one side) and the inner diameter side of the pocket bottom. Yes.

このように玉軸受１１では、ポケット１５ｃの玉１４との対向面積を低減する減肉部１５ｅ〜１５ｈをポケット１５ｃの内面１５ｄに形成した保持器１５を具備したことにより、ポケット１５ｃの内面１５ｄとそのポケット１５ｃに収容された玉１４との間に形成された油膜量を従来よりも少なくすることができることから、油膜を剪断する時に発生する剪断抵抗を従来よりも低減することができる。その結果、この玉１４による油の剪断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。   As described above, the ball bearing 11 includes the retainer 15 in which the thinned portions 15e to 15h that reduce the facing area of the pocket 15c to the ball 14 are formed on the inner surface 15d of the pocket 15c. Since the amount of oil film formed between the balls 14 accommodated in the pockets 15c can be made smaller than before, the shear resistance generated when the oil film is sheared can be reduced more than before. As a result, the torque caused by the oil shear resistance by the balls 14 can be easily reduced.

なお、図１〜図４の実施形態では、減肉部１５ｅ〜１５ｈを、ポケット先端部の内径側とポケット底部の外径側、あるいはポケット先端部の外径側とポケット底部の内径側に形成したが、その減肉部１５ｅ〜１５ｈを、ポケット先端部の内径側と外径側、ポケット底部の内径側と外径側、ポケット先端部の外径側とポケット底部の外径側、あるいは、ポケット先端部の内径側とポケット底部の内径側に形成することも可能である。   1 to 4, the thinned portions 15e to 15h are formed on the inner diameter side of the pocket tip and the outer diameter side of the pocket bottom, or on the outer diameter side of the pocket tip and the inner diameter side of the pocket bottom. However, the thinned portions 15e to 15h are divided into the inner diameter side and outer diameter side of the pocket tip, the inner diameter side and outer diameter of the pocket bottom, the outer diameter side of the pocket tip and the outer diameter side of the pocket bottom, or It is also possible to form on the inner diameter side of the pocket tip and the inner diameter side of the pocket bottom.

しかしながら、図１〜図４の実施形態のように、減肉部１５ｅ〜１５ｈを、ポケット先端部の内径側とポケット底部の外径側、あるいはポケット先端部の外径側とポケット底部の内径側に形成した場合は、その減肉部１５ｅ〜１５ｈを、ポケット先端部の内径側と外径側、ポケット底部の内径側と外径側、ポケット先端部の外径側とポケット底部の外径側、あるいは、ポケット先端部の内径側とポケット底部の内径側に形成した場合よりも、ポケット１５ｃの内面１５ｄと玉１４との接触状態が偏ることなく、玉１４の転動状態が安定して円滑な転動が容易に実現できる点で有効である。   However, as in the embodiment of FIGS. 1 to 4, the thinned portions 15 e to 15 h are arranged on the inner diameter side of the pocket tip and the outer diameter side of the pocket bottom, or the outer diameter side of the pocket tip and the inner diameter side of the pocket bottom. The thinned portions 15e to 15h are formed on the inner diameter side and outer diameter side of the pocket tip, the inner diameter side and outer diameter side of the pocket bottom, the outer diameter side of the pocket tip and the outer diameter side of the pocket bottom. Alternatively, the contact state between the inner surface 15d of the pocket 15c and the ball 14 is not biased and the rolling state of the ball 14 is stable and smoother than when formed on the inner diameter side of the pocket tip and the inner diameter side of the pocket bottom. This is effective in that simple rolling can be realized easily.

以上の実施形態では、ポケット１５ｃの内面１５ｄとそのポケット１５ｃに収容された玉１４との間に形成された油膜を剪断する時に発生する剪断抵抗を起因とするトルクの低減を図るため、ポケット１５ｃの玉１４との対向面積を低減する減肉部１５ｅ〜１５ｈとして、ポケット先端部の外径側とポケット底部の内径側、あるいは、ポケット先端部の内径側とポケット底部の外径側を切り欠い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、以下に述べる他の実施形態でも可能である。   In the above embodiment, the pocket 15c is reduced in order to reduce the torque due to the shear resistance generated when the oil film formed between the inner surface 15d of the pocket 15c and the ball 14 accommodated in the pocket 15c is sheared. As the thinned portions 15e to 15h for reducing the facing area of the ball 14, the outer diameter side of the pocket tip and the inner diameter side of the pocket bottom, or the inner diameter side of the pocket tip and the outer diameter side of the pocket bottom are cut out. However, the present invention is not limited to this, and other embodiments described below are also possible.

図５〜図７に示す実施形態では、保持器１５の減肉部１５ｉを、ポケット１５ｃの内面１５ｄに形成された凹部とすることにより形成している。この凹部は、ポケット１５ｃの内面１５ｄの円周方向全周に亘って形成された溝状をなす。また、図８〜図１０に示す実施形態では、保持器１５の減肉部１５ｊを、ポケット１５ｃの内面１５ｄに形成された凹部を保持器軸方向に貫通させることにより形成している。   In the embodiment shown in FIGS. 5 to 7, the thinned portion 15 i of the cage 15 is formed as a recess formed in the inner surface 15 d of the pocket 15 c. The concave portion has a groove shape formed over the entire circumference in the circumferential direction of the inner surface 15d of the pocket 15c. Further, in the embodiment shown in FIGS. 8 to 10, the thinned portion 15j of the cage 15 is formed by penetrating a concave portion formed in the inner surface 15d of the pocket 15c in the cage axial direction.

なお、これら二つの実施形態では、減肉部１５ｉ，１５ｊとしての凹部を円周方向に沿って一条で形成しているが、ポケット１５ｃの内面１５ｄの保持器径方向に亘って複数条の凹部を形成することも可能である。複数条の凹部を形成すれば、ポケット１５ｃの内面１５ｄの凹部形成部位において玉１４による油の剪断抵抗を起因として発生するトルクをより一層低減することができる。   In these two embodiments, the concave portions as the thinned portions 15i and 15j are formed in a single line along the circumferential direction, but a plurality of concave portions are formed along the cage radial direction of the inner surface 15d of the pocket 15c. It is also possible to form If a plurality of recesses are formed, it is possible to further reduce the torque generated due to the oil shear resistance by the balls 14 at the recess forming portion of the inner surface 15d of the pocket 15c.

以上で説明した各実施形態における減肉部１５ｅ〜１５ｊ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、また、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で減肉部１５ｅ〜１５ｊを形成することにより、減肉部１５ｅ〜１５ｊを容易に形成することができてコスト低減が図れる。   The thinned portions 15e to 15j in the respective embodiments described above can be formed by cutting after the cage 15 is manufactured by injection molding, and are formed at the same time when the cage 15 is manufactured by injection molding. It is also possible to do. Thus, by forming the thinned portions 15e to 15j by cutting or injection molding, the thinned portions 15e to 15j can be easily formed, and the cost can be reduced.

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 equivalents recited in the claims, and all modifications within the scope.

本出願人は、本発明品（本発明品１および本発明品２）と従来品についてトルク比較試験を行った。このトルク比較試験における試験条件は、図１２に示すようにラジアル荷重を５００Ｎ、軸受回転速度を４０００ｒ／ｍｉｎ、軸受温度を３０℃とした。   The present applicant conducted a torque comparison test on the product of the present invention (the product of the present invention 1 and the product of the present invention 2) and the conventional product. As shown in FIG. 12, the test conditions in this torque comparison test were a radial load of 500 N, a bearing rotational speed of 4000 r / min, and a bearing temperature of 30 ° C.

このトルク比較試験の試験結果は図１３および図１４に示すとおりである。玉とポケットの対向面積を１００％とした従来品に対して、本発明品１では、玉とポケットの対向面積を従来品よりも３０％低減して７０％とし、本発明品２では、玉とポケットの対向面積を従来品よりも５０％低減して５０％とした。   The test results of this torque comparison test are as shown in FIG. 13 and FIG. Compared to the conventional product in which the facing area of the ball and pocket is 100%, the product 1 of the present invention reduces the facing area of the ball and pocket by 30% to 70% compared to the conventional product. And the facing area of the pocket was reduced by 50% from the conventional product to 50%.

その結果、本発明品１では、トルクを従来品よりも２０％低減することができ、本発明品２では、トルクを従来品よりも３０％低減することができた。このように、ポケットの玉との対向面積を低減する減肉部をポケット内面に形成したことにより、トルクを容易に低減できることが明らかとなった。   As a result, the product 1 of the present invention was able to reduce the torque by 20% compared to the conventional product, and the product 2 of the present invention was able to reduce the torque by 30% compared to the conventional product. Thus, it has become clear that the torque can be easily reduced by forming the thinned portion on the inner surface of the pocket that reduces the area of the pocket facing the ball.

１１ 転がり軸受（玉軸受）
１２ 内輪
１３ 外輪
１４ 転動体（玉）
１５ 保持器
１５ｃ ポケット
１５ｄ ポケットの内面
１５ｅ〜１５ｊ 減肉部 11 Rolling bearings (ball bearings)
12 Inner ring 13 Outer ring 14 Rolling element (ball)
15 Cage 15c Pocket 15d Pocket inner surface 15e-15j Thinning part

Claims (9)

外周面に内側転走面が形成された内輪と、前記内輪の外側に配置され、内周面に外側転走面が形成された外輪と、前記内輪の内側転走面と前記外輪の外側転走面との間に転動自在に介在した複数の転動体と、前記内輪と外輪との間に配され、前記転動体を保持する保持器とを備え、エンジン出力で回転駆動する回転軸を静止部材に回転自在に支持する自動車電装補機用転がり軸受であって、
前記保持器は、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て前記転動体を収容する凹状のポケットを有し、前記ポケットの転動体との対向面積を低減する減肉部を前記ポケット内面に形成したことを特徴とする自動車電装補機用転がり軸受。 An inner ring having an inner rolling surface formed on the outer circumferential surface, an outer ring disposed outside the inner ring and having an outer rolling surface formed on the inner circumferential surface, an inner rolling surface of the inner ring, and an outer rolling of the outer ring. A plurality of rolling elements interposed between the running surface and a rolling surface; a retainer disposed between the inner ring and the outer ring, and holding the rolling elements; A rolling bearing for automotive electrical equipment that is rotatably supported by a stationary member,
The retainer is formed in an annular shape as a whole, and has concave pockets that are opened to an outer diameter side and an inner diameter side at a plurality of locations in the circumferential direction to accommodate the rolling elements. A rolling bearing for automotive electrical equipment, wherein a thinned portion for reducing an area facing the moving body is formed on the inner surface of the pocket. 前記保持器の減肉部は、ポケット先端部の外径側に形成されている請求項１に記載の自動車電装補機用転がり軸受。   The rolling bearing for an automotive electrical accessory according to claim 1, wherein the thinned portion of the cage is formed on the outer diameter side of the tip of the pocket. 前記保持器の減肉部は、ポケット先端部の内径側に形成されている請求項１又は２に記載の自動車電装補機用転がり軸受。   3. The rolling bearing for an automotive electrical accessory according to claim 1, wherein the thinned portion of the cage is formed on the inner diameter side of the pocket tip. 前記保持器の減肉部は、ポケット底部の外径側に形成されている請求項１〜３のいずれか一項に記載の自動車電装補機用転がり軸受。   The rolling bearing for automotive electrical equipment according to any one of claims 1 to 3, wherein the thinned portion of the cage is formed on the outer diameter side of the pocket bottom. 前記保持器の減肉部は、ポケット底部の内径側に形成されている請求項１〜４のいずれか一項に記載の自動車電装補機用転がり軸受。   The rolling bearing for an automotive electrical accessory according to any one of claims 1 to 4, wherein the thinned portion of the cage is formed on the inner diameter side of the pocket bottom. 前記保持器の減肉部は、ポケット内面に形成された凹部である請求項１に記載の自動車電装補機用転がり軸受。   The rolling bearing for an automotive electrical accessory according to claim 1, wherein the thinned portion of the cage is a recess formed in an inner surface of the pocket. 前記凹部は、ポケット内面の円周方向全周に亘って溝状に形成されている請求項６に記載の自動車電装補機用転がり軸受。   The rolling bearing according to claim 6, wherein the concave portion is formed in a groove shape over the entire circumference in the circumferential direction of the pocket inner surface. 前記凹部は、ポケット内面の保持器軸方向に貫通して形成されている請求項６又は７に記載の自動車電装補機用転がり軸受。   The rolling bearing for an automotive electrical accessory according to claim 6 or 7, wherein the recess is formed so as to penetrate in the cage axial direction of the inner surface of the pocket. 前記凹部は、ポケット内面の保持器径方向に亘って複数条に形成されている請求項７又は８に記載の自動車電装補機用転がり軸受。   The rolling bearing for an automotive electrical accessory according to claim 7 or 8, wherein the concave portion is formed in a plurality of strips across the radial direction of the cage on the inner surface of the pocket.
JP2009236886A 2009-10-14 2009-10-14 Rolling bearing for electrical auxiliary machine of automobile Withdrawn JP2011085165A (en)

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