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JP2008019937A - Rolling bearing - Google Patents

Rolling bearing Download PDF

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Publication number
JP2008019937A
JP2008019937A JP2006191225A JP2006191225A JP2008019937A JP 2008019937 A JP2008019937 A JP 2008019937A JP 2006191225 A JP2006191225 A JP 2006191225A JP 2006191225 A JP2006191225 A JP 2006191225A JP 2008019937 A JP2008019937 A JP 2008019937A
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JP
Japan
Prior art keywords
cage
rolling bearing
dynamic pressure
outer ring
bearing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP2006191225A
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Japanese (ja)
Inventor
Katsunori Otsuka
克則 大塚
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JTEKT Corp
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JTEKT Corp
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Filing date
Publication date
Application filed by JTEKT Corp filed Critical JTEKT Corp
Priority to JP2006191225A priority Critical patent/JP2008019937A/en
Publication of JP2008019937A publication Critical patent/JP2008019937A/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Withdrawn legal-status Critical Current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
    • F16C33/3837—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages
    • F16C33/3843—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages
    • F16C33/3856—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages made from plastic, e.g. injection moulded window 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
    • F16C33/38—Ball cages
    • F16C33/3806—Details of interaction of cage and race, e.g. retention, centring
    • 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
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/16—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls
    • F16C19/163—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls with angular contact
    • 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
    • F16C2322/00—Apparatus used in shaping articles
    • F16C2322/39—General buildup of machine tools, e.g. spindles, slides, actuators

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

Abstract

【課題】 硬質膜をコーティングすることなしに、耐焼付き性を向上させ、これにより、安価でかつ高速回転性に優れた転がり軸受を提供する。
【解決手段】 保持器5の案内面に、外輪2の被案内面との間に動圧を発生させて両者間の直接接触を回避する動圧溝7が射出成形によって形成されている。
【選択図】 図２PROBLEM TO BE SOLVED: To provide a rolling bearing which is improved in seizure resistance without being coated with a hard film, thereby being inexpensive and excellent in high speed rotation.
SOLUTION: A dynamic pressure groove 7 that generates dynamic pressure between a guide surface of a cage 5 and a guided surface of an outer ring 2 and avoids direct contact between the two is formed by injection molding.
[Selection] Figure 2

Description

この発明は、転がり軸受に関し、特に、耐焼付き性を向上させた転がり軸受に関する。   The present invention relates to a rolling bearing, and more particularly to a rolling bearing with improved seizure resistance.

外輪、内輪、両軌道輪の間に配置された複数の転動体、およびこれらの転動体を保持する保持器を備えている転がり軸受は、よく知られているが、高速回転の工作機械に使用される場合などのために、その高速回転性すなわち高速回転時の耐焼付き性、耐摩耗性などを向上させることが課題となっている。例えば、特許文献１には、耐焼付き性向上のために、保持器の案内面に硬質膜をコーティングすることが提案されている。
特開２００５−１４７３０５号公報 Rolling bearings equipped with outer rings, inner rings, a plurality of rolling elements arranged between both races, and a cage for holding these rolling elements are well known, but are used for high-speed rotating machine tools. Therefore, it is a problem to improve the high-speed rotation property, that is, the seizure resistance and the wear resistance during high-speed rotation. For example, Patent Document 1 proposes coating a guide surface of a cage with a hard film in order to improve seizure resistance.
Japanese Patent Laying-Open No. 2005-147305

上記硬質膜をコーティングする方法は、保持器の形状が複雑であるため、コストが高くなるという問題がある。   The method of coating the hard film has a problem that the cost is high because the shape of the cage is complicated.

この発明の目的は、硬質膜をコーティングすることなしに、耐焼付き性を向上させ、これにより、安価でかつ高速回転性に優れた転がり軸受を提供することにある。   An object of the present invention is to provide a rolling bearing which is improved in seizure resistance without coating a hard film, thereby being inexpensive and excellent in high-speed rotation.

この発明によるアンギュラ玉軸受は、外輪、内輪、両軌道輪の間に配置された複数の転動体、およびこれらの転動体を保持する合成樹脂製保持器を備えている転がり軸受において、保持器の案内面に、軌道輪の被案内面との間に動圧を発生させて両者間の直接接触を回避する動圧溝が射出成形によって形成されていることを特徴とするものである。   An angular contact ball bearing according to the present invention is a rolling bearing comprising a plurality of rolling elements disposed between an outer ring, an inner ring, and both race rings, and a synthetic resin cage that holds these rolling elements. A dynamic pressure groove that generates a dynamic pressure between the guide surface and the guided surface of the raceway ring to avoid direct contact between the two is formed by injection molding.

動圧溝は、例えば、平面視ほぼＶ字形のものをヘリングボーン状に配列したものとされ、Ｖ字の先端は、回転方向と反対側に向けられる。動圧溝の形状は、Ｖ字形に限られるものではない。   The dynamic pressure grooves are, for example, substantially V-shaped in plan view arranged in a herringbone shape, and the V-shaped tip is directed to the opposite side to the rotation direction. The shape of the dynamic pressure groove is not limited to the V shape.

転がり軸受は、アンギュラ玉軸受、深溝型玉軸受、円筒ころ軸受などとされる。   The rolling bearing is an angular ball bearing, a deep groove type ball bearing, a cylindrical roller bearing or the like.

保持器は、円筒状とされることが好ましい。保持器を形成する合成樹脂は、例えばＰＥＥＫとされるが、これに限定されるものではない。   The cage is preferably cylindrical. The synthetic resin forming the cage is, for example, PEEK, but is not limited thereto.

好ましくは、転がり軸受は、外輪の一端側にカウンタボアが形成されたアンギュラ玉軸受であり、保持器は、軸方向中心線に対して対称の円筒状でかつ外輪案内とされており、動圧溝は、保持器の非カウンタボア側の外周面にのみ形成される。   Preferably, the rolling bearing is an angular ball bearing in which a counterbore is formed on one end side of the outer ring, and the cage is cylindrical and symmetrical with respect to the axial center line, and is a dynamic pressure guide. The groove is formed only on the outer peripheral surface of the cage on the non-counter bore side.

この発明の転がり軸受によると、動圧溝によって発生させられた動圧によって保持器の案内面と軌道輪の被案内面とが直接接触することを回避することにより、耐焼付き性、耐摩耗性が向上するので、優れた高速回転性および貧潤滑状態での高耐久性を得ることができる。また、摩擦力の減少に伴う低トルク化が可能であり、経済性も向上する。しかも、動圧溝は、合成樹脂製保持器を射出成形で製作するときに同時に形成できるので、金属材料にエッチングで溝を形成することに比べて、安価に製造することができる。   According to the rolling bearing of the present invention, by avoiding direct contact between the guide surface of the cage and the guided surface of the bearing ring due to the dynamic pressure generated by the dynamic pressure groove, seizure resistance and wear resistance are prevented. Therefore, excellent high-speed rotation and high durability in poor lubrication can be obtained. In addition, the torque can be reduced as the frictional force decreases, and the economy is improved. Moreover, since the dynamic pressure groove can be formed simultaneously with the production of the synthetic resin cage by injection molding, it can be manufactured at a lower cost compared to forming the groove by etching in the metal material.

この発明の実施の形態を、以下図面を参照して説明する。以下の説明において、左右は図の左右をいうものとする。   Embodiments of the present invention will be described below with reference to the drawings. In the following description, the left and right refer to the left and right in the figure.

図１は、この発明による転がり軸受の１実施形態の一部を示している。図２は、その要部である保持器を外周面側から見たものである。   FIG. 1 shows a part of one embodiment of a rolling bearing according to the present invention. FIG. 2 shows the main part of the cage as viewed from the outer peripheral surface side.

転がり軸受(1)は、アンギュラ玉軸受で、外輪(2)、内輪(3)、両輪(2)(3)の間に周方向に所定間隔で配置された複数の玉(4)、およびこれらの玉(4)を収容する複数のポケット(6)を有する保持器(5)を備えている。   The rolling bearing (1) is an angular contact ball bearing, and includes an outer ring (2), an inner ring (3), a plurality of balls (4) arranged at predetermined intervals in the circumferential direction between the two rings (2) and (3), and these And a cage (5) having a plurality of pockets (6) for receiving the balls (4).

保持器(5)は、外輪案内とされており、その外径と外輪(2)との距離がその内径と内輪(3)との距離よりも小さくなされている。外輪(2)には、その右側に右方（軸方向外方）に向かって径が大きくなされたカウンタボア(2a)が設けられており、その結果、保持器(5)は、外輪(2)の左部のみで案内されている。   The cage (5) is an outer ring guide, and the distance between the outer diameter and the outer ring (2) is smaller than the distance between the inner diameter and the inner ring (3). The outer ring (2) is provided with a counter bore (2a) whose diameter is increased toward the right (axially outward) on the right side thereof. As a result, the cage (5) It is guided only on the left side of).

図２に詳しく示すように、保持器(5)の非カウンタボア側の外周面（案内面）に、平面視ほぼＶ字形のものをヘリングボーン状に配列した動圧溝(7)が形成されている。動圧溝(7)のＶ字の先端は、矢印で示す回転方向と反対側に向けられている。また、Ｖ字の一方は、左端に開口し、他方は、外輪(2)の軌道面に対応する位置まで伸ばされている。動圧溝(7)は、保持器(5)の案内面（外周面）と外輪(2)の被案内面（内周面）との間に動圧を発生させるもので、この動圧によって、保持器(5)と外輪(2)とが直接接触することが回避される。   As shown in detail in FIG. 2, a dynamic pressure groove (7) is formed on the outer peripheral surface (guide surface) on the non-counter bore side of the cage (5) in which substantially V-shaped members in a plan view are arranged in a herringbone shape. ing. The V-shaped tip of the dynamic pressure groove (7) is directed to the opposite side of the rotation direction indicated by the arrow. One of the V shapes opens to the left end, and the other is extended to a position corresponding to the raceway surface of the outer ring (2). The dynamic pressure groove (7) generates dynamic pressure between the guide surface (outer peripheral surface) of the cage (5) and the guided surface (inner peripheral surface) of the outer ring (2). Further, direct contact between the cage (5) and the outer ring (2) is avoided.

保持器(5)は、合成樹脂製で、射出成形によって形成されており、動圧溝(7)は、射出成形の金型に動圧溝用凸部を加工しておくことにより、射出成形時に形成される。   The cage (5) is made of synthetic resin and formed by injection molding, and the dynamic pressure groove (7) is injection molded by processing the convex portion for the dynamic pressure groove in an injection mold. Sometimes formed.

なお、上記においては、外輪(2)にカウンタボア(2a)が形成されたアンギュラ玉軸受(1)について示したが、軸受の形状は、図示したアンギュラ玉軸受(1)に限られるものではない。転がり軸受が深溝型玉軸受または円ころ軸受の場合、保持器(5)は、外輪の左右両側で案内されるので、動圧溝(7)を保持器(5)の左右両側に設けることが好ましい。   In the above, the angular ball bearing (1) in which the counter bore (2a) is formed on the outer ring (2) is shown, but the shape of the bearing is not limited to the illustrated angular ball bearing (1). . When the rolling bearing is a deep groove type ball bearing or a roller bearing, the cage (5) is guided on both the left and right sides of the outer ring, so it is necessary to provide the dynamic pressure grooves (7) on both the left and right sides of the cage (5). preferable.

図１は、この発明による転がり軸受の１実施形態を示す縦断面図である。FIG. 1 is a longitudinal sectional view showing an embodiment of a rolling bearing according to the present invention. 図２は、保持器を外周面側から見た図である。FIG. 2 is a view of the cage as viewed from the outer peripheral surface side.

符号の説明Explanation of symbols

(1) アンギュラ玉軸受（転がり軸受）
(2) 外輪
(2a) カウンタボア
(3) 内輪
(4) 玉
(5) 保持器
(7) 動圧溝 (1) Angular contact ball bearings (rolling bearings)
(2) Outer ring
(2a) Counter bore
(3) Inner ring
(4) Ball
(5) Cage
(7) Dynamic pressure groove

Claims (2)

外輪、内輪、両軌道輪の間に配置された複数の転動体、およびこれらの転動体を保持する合成樹脂製保持器を備えている転がり軸受において、
保持器の案内面に、軌道輪の被案内面との間に動圧を発生させて両者間の直接接触を回避する動圧溝が射出成形によって形成されていることを特徴とする転がり軸受。 In a rolling bearing provided with an outer ring, an inner ring, a plurality of rolling elements disposed between both race rings, and a synthetic resin cage that holds these rolling elements,
A rolling bearing characterized in that a dynamic pressure groove for generating a dynamic pressure between a guide surface of a cage and a guided surface of a bearing ring to avoid direct contact therebetween is formed by injection molding. 転がり軸受は、外輪の一端側にカウンタボアが形成されたアンギュラ玉軸受であり、保持器は、軸方向中心線に対して対称の円筒状でかつ外輪案内とされており、動圧溝は、保持器の非カウンタボア側の外周面にのみ形成されていることを特徴とする請求項１の転がり軸受。   The rolling bearing is an angular ball bearing in which a counter bore is formed on one end side of the outer ring, the cage is a cylindrical shape that is symmetrical with respect to the axial center line, and is an outer ring guide. 2. The rolling bearing according to claim 1, wherein the rolling bearing is formed only on the outer peripheral surface of the cage on the non-counter bore side.
JP2006191225A 2006-07-12 2006-07-12 Rolling bearing Withdrawn JP2008019937A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010134602A1 (en) * 2009-05-21 2010-11-25 日本精工株式会社 Rolling bearing and method for producing the same
CN103790965A (en) * 2014-02-27 2014-05-14 洛阳轴研科技股份有限公司 Bearing retainer with grooves in the outer diameter part and design method thereof
JP2014095442A (en) * 2012-11-09 2014-05-22 Seiko Instruments Inc Retainer, rolling bearing, and dental handpiece
CN104246252A (en) * 2012-04-10 2014-12-24 舍弗勒技术有限两合公司 Flexible bearing cage

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010134602A1 (en) * 2009-05-21 2010-11-25 日本精工株式会社 Rolling bearing and method for producing the same
JPWO2010134602A1 (en) * 2009-05-21 2012-11-12 日本精工株式会社 Rolling bearing and manufacturing method thereof
CN104246252A (en) * 2012-04-10 2014-12-24 舍弗勒技术有限两合公司 Flexible bearing cage
JP2014095442A (en) * 2012-11-09 2014-05-22 Seiko Instruments Inc Retainer, rolling bearing, and dental handpiece
CN103790965A (en) * 2014-02-27 2014-05-14 洛阳轴研科技股份有限公司 Bearing retainer with grooves in the outer diameter part and design method thereof

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