JP2005201457A - Cylindrical roller bearing - Google Patents

Cylindrical roller bearing Download PDF

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Publication number
JP2005201457A
JP2005201457A JP2005092987A JP2005092987A JP2005201457A JP 2005201457 A JP2005201457 A JP 2005201457A JP 2005092987 A JP2005092987 A JP 2005092987A JP 2005092987 A JP2005092987 A JP 2005092987A JP 2005201457 A JP2005201457 A JP 2005201457A
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Prior art keywords
cage
cylindrical roller
roller bearing
mold
annular
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JP2005092987A
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Japanese (ja)
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Naoki Matsuyama
直樹 松山
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NSK Ltd
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NSK Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/46—Cages for rollers or needles
    • F16C33/4605—Details of interaction of cage and race, e.g. retention or 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/46—Cages for rollers or needles
    • F16C33/4617—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages
    • F16C33/4623—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages
    • F16C33/4635—Massive or moulded cages having cage pockets surrounding the rollers, 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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/24—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly
    • F16C19/26—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly with a single row of rollers
    • 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
    • F16C2220/00—Shaping
    • F16C2220/02—Shaping by casting
    • F16C2220/04—Shaping by casting by injection-moulding

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical roller bearing provided with an outer ring guide cage having a shape that a slideway when the cage is manufactured by injection molding is smooth, high precision, and high strength. <P>SOLUTION: The cage 10 for the cylindrical roller bearing is so formed that a pocket 13 to contain the cylindrical roller is defined by a pair of annular parts 11 and 11 and column parts 12 which are laid across a space between the annular parts and the cage 10 is so constituted that an annular protrusion part 14 protruded externally is formed on the outer peripheral surface of at least the one annular part of a pair of the annular parts, and the outer peripheral surface of the annular protrusion part is brought into contact with the inner peripheral surface of an outer ring. The cage 10 is molded by injection molding in a state that the mating part of a mold is positioned at a non-guide part, for example, the column part 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、円筒ころ軸受に関するものであり、詳しくは射出成形によって合成樹脂製保持器を備えた円筒ころ軸受に関するものである。   The present invention relates to a cylindrical roller bearing, and more particularly to a cylindrical roller bearing provided with a synthetic resin cage by injection molding.

従来の円筒ころ軸受においては、内輪の外周面および外輪の内周面に形成された軌道面に転動体である円筒ころが介装されている。そして、この円筒ころ軸受には、転動体を軌道面上に保持するために、内輪および外輪間に転動体を保持する環状の保持器が介装されている。   In conventional cylindrical roller bearings, cylindrical rollers, which are rolling elements, are interposed on raceways formed on the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring. The cylindrical roller bearing is provided with an annular cage for holding the rolling elements between the inner ring and the outer ring in order to hold the rolling elements on the raceway surface.

ところで、工作機械の主軸を支持する軸受は、工作精度を高めるため、振動特性が良好であることが求められている。また、近年においては、加工効率向上のため、高速回転性（高回転速度で長時間安定して使用できること）が求められている。
このような特性を満たすために、軽量で柔軟性に優れる合成樹脂の保持器が使用されることが多くなった。このような保持器は、射出成形で形成され、保持器の案内形式には、転動体案内方式が広く採用されている。このような保持器を使用した軸受は、運転時の発熱を押さえるために使用するグリースや潤滑油の量をごく微量にして運転することができる。 By the way, a bearing that supports the spindle of a machine tool is required to have good vibration characteristics in order to increase machine accuracy. In recent years, in order to improve processing efficiency, high-speed rotation properties (that can be used stably for a long time at a high rotation speed) are required.
In order to satisfy such characteristics, a synthetic resin cage that is lightweight and excellent in flexibility is often used. Such a cage is formed by injection molding, and a rolling element guide system is widely adopted as a guide type of the cage. A bearing using such a cage can be operated with a very small amount of grease or lubricating oil used to suppress heat generation during operation.

かかる用途に対応できる軸受としては、外輪つば付・内輪つば無し（ＮＵ型）円筒ころ軸受や、内輪つば付・外輪つば無し（Ｎ型）円筒ころ軸受等があるが、給油した潤滑油が容易に軸受外部に排出できるＮ型が広く採用されている。   Bearings that can be used for such applications include outer ring collar / no inner ring collar (NU type) cylindrical roller bearings and inner ring collar / outer ring collarless (N type) cylindrical roller bearings. N type that can be discharged to the outside of the bearing is widely adopted.

しかしながら、回転速度が高くなると保持器は遠心力により振れ回り運動を起こすとともに、合成樹脂強度不足から保持器自身が変形して、ポケット部でころを拘束し運動を阻害してしまい、異常発熱や焼付き、保持器破損といった問題があった。
そのような問題をクリアするために、合成樹脂製の外輪案内保持器が提案されている（特許文献１，２，３参照）。このような合成樹脂の保持器を製造する方法にラジアルドロー方式の射出成形法がある。 However, when the rotational speed increases, the cage causes a swinging motion due to centrifugal force, and the cage itself deforms due to insufficient strength of the synthetic resin, restricting the rollers at the pockets and hindering the motion, causing abnormal heat generation and There were problems such as seizure and breakage of the cage.
In order to clear such a problem, a synthetic resin outer ring guide retainer has been proposed (see Patent Documents 1, 2, and 3). As a method for producing such a synthetic resin cage, there is a radial draw method.

図１４にラジアルドロー方式の射出成形法で用いられる成形型６０の断面図の一部を示す。成形型６０の一部は、内周面を形成する金型部分６１、第１スライドコア６２、第２スライドコア６３から概略構成されている。
金型部分６１は、その外周面が保持器の内周面を形成する円筒形状である。金型部分６１の外周には図示しない複数のスライドコアが配置され、成形型６０の型締め時にそれらが保持器の外周面と転動体を保持するポケット部を形成する。複数のスライドコアの一部である第１スライドコア６２、第２スライドコア６３は、断面視において凸形状をしており、金型部分６１の外周面と並置される円弧状の基部６２ａ，６３ａと、該基部の金型部分６１側の面に略垂直に立設され保持器のポケット部を形成する円柱状の突部６２ｂ，６３ｂとから構成されている。
成形型６０が型締めされた際には、金型部分６１の外周面の所定箇所にスライドコア６２，６３の突部６２ｂ，６３ｂが当接し、スライドコアの基部６２ａ，６３ａの互いに隣接する側面６２ｃ，６３ｃが当接することで、保持器のキャビティ空間を形成する。ついで、キャビティ空間内に合成樹脂材料を射出することで、周方向に間隔を隔てて配置されたポケット部を有する環状の合成樹脂製の保持器７０が成形される。
ころ軸受用合成樹脂保持器を射出成形で製作する際に、ウエルド部の強度や保持器の精度を確保する方法として、提案されている（特許文献４〜８参照）。
特開平１１−３３６７６７号 特開平１１−８２５２０号 特願２００１−２３１６９８ 特開平９−２９７７６号 特開平１０−２６１４１号 特開平１０−３１１３３８号 特開平１０−３１８２６５号 特開２００２−５１７６号 FIG. 14 shows a part of a cross-sectional view of a mold 60 used in the radial-draw type injection molding method. A part of the molding die 60 is roughly constituted by a mold part 61 that forms an inner peripheral surface, a first slide core 62, and a second slide core 63.
The mold portion 61 has a cylindrical shape whose outer peripheral surface forms the inner peripheral surface of the cage. A plurality of slide cores (not shown) are disposed on the outer periphery of the mold portion 61, and when the mold 60 is clamped, they form a pocket portion that holds the outer peripheral surface of the cage and the rolling elements. The first slide core 62 and the second slide core 63, which are a part of the plurality of slide cores, have a convex shape in a sectional view, and arc-shaped base portions 62a and 63a juxtaposed with the outer peripheral surface of the mold portion 61. And columnar protrusions 62b and 63b that are erected substantially perpendicularly to the surface of the base portion on the mold part 61 side and form a pocket portion of the cage.
When the mold 60 is clamped, the protrusions 62b and 63b of the slide cores 62 and 63 come into contact with predetermined positions on the outer peripheral surface of the mold portion 61, and the side surfaces of the slide core bases 62a and 63a that are adjacent to each other. A cavity space of the cage is formed by the contact of 62c and 63c. Next, by injecting the synthetic resin material into the cavity space, an annular synthetic resin cage 70 having pocket portions arranged at intervals in the circumferential direction is formed.
When manufacturing a synthetic resin cage for roller bearings by injection molding, it has been proposed as a method for ensuring the strength of the weld and the accuracy of the cage (see Patent Documents 4 to 8).
JP-A-11-336767 JP-A-11-82520 Japanese Patent Application No. 2001-231698 JP-A-9-29776 JP-A-10-26141 Japanese Patent Laid-Open No. 10-311338 JP-A-10-318265 JP 2002-5176 A

上述したラジアルドロー方式の射出成形法によって成形された保持器の外周面上のパーティングラインは、保持器の径方向に突出した「ばり」や軸線方向に延びた突状の「ばり」等を有している。外輪案内形式の保持器の場合、このような「ばり」は、保持器が軸受に組込まれ軸受が作動している間に、軸受の外輪の内周面と摺接して摩耗し摩耗粉を生じたり、トルク変動を起こしてしまい軸受の回転に支障を来たしてしまう。
従来は、ころ案内方式であったため外径面にパーティングラインがあっても性能には影響しなかった。
こうした「ばり」の除去作業は煩雑で、バレル加工でも完全に除去することは困難で、切削加工にて除去するしかなく、加工コストのアップに繋がり、さらには量産性も落ちてしまう。
また、外輪案内形式の保持器の場合、パーティングライン以外にも保持器の真円度が重要となってくる。一般的に外輪案内の場合、外輪内径面と保持器外径面（案内部）との隙間は ０．２ｍｍ〜０．６ｍｍ 程度確保して設定されている。
保持器の真円度が悪いと上記案内隙間を最適に確保できなくなったり、運転中の保持器の挙動が安定せずトルクの増大、温度上昇、異常摩耗等の不具合が発生する心配があった。 The parting line on the outer peripheral surface of the cage formed by the above-described injection method of the radial draw method is a “burr” protruding in the radial direction of the cage or a protruding “burr” extending in the axial direction. Have. In the case of a cage of the outer ring guide type, such a “burr” is worn while being in sliding contact with the inner peripheral surface of the outer ring of the bearing while the cage is incorporated in the bearing and the bearing is operating. Or cause torque fluctuations that hinder the rotation of the bearing.
Conventionally, since it was a roller guide system, even if there was a parting line on the outer diameter surface, the performance was not affected.
The removal operation of such “burrs” is complicated, and it is difficult to completely remove even “barrel processing”, and it must be removed by cutting processing, which leads to an increase in processing cost and further reduces mass productivity.
In the case of the outer ring guide type cage, the roundness of the cage is important in addition to the parting line. In general, in the case of the outer ring guide, the clearance between the outer ring inner diameter surface and the cage outer diameter surface (guide portion) is set to ensure about 0.2 mm to 0.6 mm.
If the roundness of the cage is poor, there is a concern that the above guide gap cannot be secured optimally, or the behavior of the cage during operation is not stable, and problems such as increased torque, temperature rise, and abnormal wear may occur. .

本発明の目的は、保持器を射出成形で製作した際の案内面のなめらかな形状、高い精度及び高い強度を有する外輪案内保持器を備えた円筒ころ軸受を提供することにある。   An object of the present invention is to provide a cylindrical roller bearing provided with an outer ring guide retainer having a smooth shape, high accuracy and high strength of a guide surface when the retainer is manufactured by injection molding.

本発明の請求項１記載の円筒ころ軸受では、一対の環状部とそれらの環状部に差し渡された柱部とによって円筒ころを収容するポケットが画成され、前記一対の環状部のうちの少なくとも一方の環状部の外周面に外方へ突出する環状凸部が形成され、その環状凸部の外周面を外輪の内周面に当接させて介装される保持器を備えた円筒ころ軸受において、前記保持器が、金型の合わせ部を前記保持器上の非案内部に位置させて射出成形することで形成されることを特徴とする。   In the cylindrical roller bearing according to claim 1 of the present invention, a pocket for accommodating the cylindrical roller is defined by the pair of annular portions and the column portions passed to the annular portions, of the pair of annular portions. Cylindrical roller provided with a cage in which an annular convex portion protruding outward is formed on the outer circumferential surface of at least one annular portion, and the outer circumferential surface of the annular convex portion is brought into contact with the inner circumferential surface of the outer ring. In the bearing, the cage is formed by injection molding with a mating portion of a mold positioned at a non-guide portion on the cage.

前記構成の円筒ころ軸受によれば、金型の合わせ部、即ちパーティングラインを非案内部に位置させた状態で射出成形するので、成形された保持器にはパーティングラインに生じるばり等が保持器案内部である環状部に発生することはなく高速回転に伴う回転不良を起こすようなことはない。   According to the cylindrical roller bearing having the above-described configuration, injection molding is performed in a state where the die mating portion, that is, the parting line is positioned in the non-guide portion, and thus the molded cage has a flash generated on the parting line. It does not occur in the annular part which is the cage guide part and does not cause a rotation failure due to high speed rotation.

本発明の請求項２記載の円筒ころ軸受では、前記保持器のポケットを形成するスライドコアの合わせ部が前記柱部に位置させて射出成形することで形成されることを特徴とする。
前記構成の円筒ころ軸受によれば、ポケットを形成するスライドコアの合わせ部が高い精度を比較的要求されない柱部に位置するため、即ち最も真円度が要求される環状部に位置していないため、案内部の真円度を高い精度で確保できる。 The cylindrical roller bearing according to a second aspect of the present invention is characterized in that the slide core mating portion that forms the pocket of the cage is formed by being positioned at the column portion and injection-molded.
According to the cylindrical roller bearing configured as described above, the mating portion of the slide core forming the pocket is located at the column portion where relatively high accuracy is not required, that is, not located at the annular portion where the most roundness is required. Therefore, the roundness of the guide portion can be ensured with high accuracy.

本発明の請求項３記載の円筒ころ軸受では、前記柱部に射出成形時のウエルド部が位置されることを特徴とする。
前記構成の円筒ころ軸受によれば、ウエルド部が柱部に位置するため、環状部と比較し、接合面積を充分に確保することができ、保持器全体の強度を高い強度に確保できる。 The cylindrical roller bearing according to claim 3 of the present invention is characterized in that a weld portion at the time of injection molding is positioned on the column portion.
According to the cylindrical roller bearing configured as described above, since the weld portion is located at the column portion, a sufficient joint area can be ensured as compared with the annular portion, and the strength of the entire cage can be secured at a high strength.

本発明の請求項４記載の円筒ころ軸受では、前記保持器の射出成形時のゲート数が前記ポケット数と同数であることを特徴とする。
前記構成の円筒ころ軸受によれば、ポケット数に等しいゲート数が均等に設けられるため、保持器の形状が高い真円度に形成されている。 The cylindrical roller bearing according to claim 4 of the present invention is characterized in that the number of gates during injection molding of the cage is the same as the number of pockets.
According to the cylindrical roller bearing configured as described above, the number of gates equal to the number of pockets is evenly provided, so that the shape of the cage is formed with high roundness.

本発明の請求項５記載の円筒ころ軸受では、前記保持器の前記ポケット数が偶数個に設定され、射出成形時のゲート数が前記ポケット数の１／２であることを特徴とする。
前記構成の円筒ころ軸受によれば、ポケット数の半数のゲート数が均等に設けられるため、保持器の形状が高い真円度に形成されている。 The cylindrical roller bearing according to claim 5 of the present invention is characterized in that the number of pockets of the cage is set to an even number, and the number of gates during injection molding is ½ of the number of pockets.
According to the cylindrical roller bearing configured as described above, since the number of gates, which is half the number of pockets, is evenly provided, the shape of the cage is formed with high roundness.

本発明の請求項６記載の円筒ころ軸受では、前記保持器が、射出成形後にバレル処理を施されることを特徴とする。
前記構成の円筒ころ軸受によれば、保持器のばり等の除去やエッジ部の丸めが行え、さらに案内部の面粗さの向上が図れる。 The cylindrical roller bearing according to claim 6 of the present invention is characterized in that the cage is subjected to barrel treatment after injection molding.
According to the cylindrical roller bearing configured as described above, it is possible to remove the burrs of the cage and the like, and to round the edge portion, and to further improve the surface roughness of the guide portion.

以上説明したように本発明の円筒ころ軸受によれば、金型の合わせ部が非案内部に位置するので、この金型によって成形された保持器はパーティングラインによる回転不良を起こすことがない。また、ゲートが均等に設けられるため、保持器の形状が真円に形成できる。
更に、本発明の円筒ころ軸受によれば、ウエルド部が柱部に位置するため、保持器全体の強度が確保できる。したがって、上記保持器が組み付けられた円筒ころ軸受を使用することで、安価な保持器でスムーズな高速回転が可能で、且つ温度上昇も低い工作機械等を得ることができる。 As described above, according to the cylindrical roller bearing of the present invention, since the mating portion of the mold is located in the non-guide portion, the cage molded by this mold does not cause poor rotation due to the parting line. . Further, since the gates are provided uniformly, the shape of the cage can be formed in a perfect circle.
Furthermore, according to the cylindrical roller bearing of the present invention, since the weld portion is located at the column portion, the strength of the entire cage can be ensured. Therefore, by using the cylindrical roller bearing in which the cage is assembled, it is possible to obtain a machine tool or the like that can smoothly rotate at a high speed with an inexpensive cage and has a low temperature rise.

以下、本発明の円筒ころ軸受の実施形態を図１乃至図１３に基づいて詳細に説明する。図１は本発明の円筒ころ軸受の一実施形態を示す断面図、図２は図１における保持器の部分斜視図、図３は図２における保持器を成形するための金型の軸芯に対して垂直方向の断面図、図４は図２における保持器を成形するための金型の軸芯方向の断面図、図５は図２における保持器の部分平面図である。   Hereinafter, embodiments of the cylindrical roller bearing of the present invention will be described in detail with reference to FIGS. 1 is a sectional view showing an embodiment of a cylindrical roller bearing of the present invention, FIG. 2 is a partial perspective view of the cage in FIG. 1, and FIG. 3 is an axis of a mold for molding the cage in FIG. FIG. 4 is a sectional view in the vertical direction, FIG. 4 is a sectional view in the axial direction of a mold for molding the cage in FIG. 2, and FIG. 5 is a partial plan view of the cage in FIG.

図１に示すように、本実施形態の円筒ころ軸受は、内輪つば付・外輪つば無し（Ｎ型）円筒ころ軸受である。即ち、この軸受では、つばを備えていない外輪１と、つば２ａを両端に備えた内輪２と、両輪１，２間に転動自在に配置した複数のころ３と、該ころ３を保持する保持器１０とを備えている。そして、保持器１０は、外輪１の内周面に案内されている。   As shown in FIG. 1, the cylindrical roller bearing of the present embodiment is an inner ring flanged / outer ring flanged (N type) cylindrical roller bearing. That is, in this bearing, an outer ring 1 that does not include a collar, an inner ring 2 that includes a collar 2a at both ends, a plurality of rollers 3 that are rotatably arranged between both wheels 1 and 2, and the rollers 3 are held. And a cage 10. The cage 10 is guided on the inner peripheral surface of the outer ring 1.

図２に示すように、保持器１０では、一対の環状部１１，１１と該環状部に差し渡された柱部１２とによって円筒ころ３を収容するポケット１３が画成され、環状部１１，１１の外周面に外方へ突出する環状凸部１４，１４が形成されている。   As shown in FIG. 2, in the cage 10, a pocket 13 that accommodates the cylindrical roller 3 is defined by a pair of annular portions 11, 11 and a column portion 12 that is passed to the annular portion. 11 are formed on the outer peripheral surface of the outer peripheral surface 11.

なお、射出成形に採用される合成樹脂材料としては、ポリアミド６６，ポリアミド４６，ポリフェニレンサルファイド，熱可塑性ポリイミド，ポリエーテルエーテルケント等を母材とし、保持器強度向上のためにガラス繊維や炭素繊維，アラミド繊維を１０〜 ４０重量％添加したものが挙げられれる。   In addition, as a synthetic resin material used for injection molding, polyamide 66, polyamide 46, polyphenylene sulfide, thermoplastic polyimide, polyether ether kent and the like are used as a base material, and glass fiber, carbon fiber, The thing which added 10 to 40 weight% of aramid fiber is mentioned.

図２乃至図４に示すように、保持器１０は、金型２０で射出成形によって成形される。金型２０は、保持器の内周面を形成する金型部分２１（図４参照）と、環状部１１を形成する一対の金型部分２２（図４参照）と、ポケット１３および柱部１２を形成するスライドコア２３とによって構成されている。   As shown in FIGS. 2 to 4, the cage 10 is molded by injection molding with a mold 20. The mold 20 includes a mold portion 21 (see FIG. 4) that forms the inner peripheral surface of the cage, a pair of mold portions 22 (see FIG. 4) that forms the annular portion 11, the pocket 13 and the column portion 12. And a slide core 23 that forms the shape.

金型２０は、金型部分２１の外周面に金型部分２２を嵌め込み、それらの間にスライドコア２３を嵌め込んで組み付けられる。
このように組み付けられた金型２０は、金型部分２１，２２，２３によって、柱部１２が成形されるキャビティ２４と、環状部１１および環状凸部１４が成形されるキャビティ２５（図４参照）が形成される。
この金型２０では、金型部分２１にキャビティ２４又は２５に開口するゲート２６が形成されている。このゲート２６は、ポケット１３の数に対応しており、ポケット１３数と同数またはポケット１３数の半数が、柱部１２を成形するキャビティ２４若しくはキャビティ２５に設けられている。そして、組み付けられた金型２０のキャビティ２４，２５には、ゲート２６を介して合成樹脂が射出される。
なお、図３及び図４（ｂ）は、ゲート２６をキャビティ２５に設けた例を示し、図６及び図７はゲート２６をキャビティ２４に設けた例を示す。 The mold 20 is assembled by fitting the mold part 22 into the outer peripheral surface of the mold part 21 and fitting the slide core 23 therebetween.
The mold 20 assembled in this way has a cavity 24 in which the column part 12 is molded and a cavity 25 in which the annular part 11 and the annular convex part 14 are molded by the mold parts 21, 22 and 23 (see FIG. 4). ) Is formed.
In the mold 20, a gate 26 that opens to the cavity 24 or 25 is formed in the mold portion 21. The number of the gates 26 corresponds to the number of pockets 13, and the same number as the number of pockets 13 or half of the number of pockets 13 is provided in the cavity 24 or the cavity 25 that molds the column portion 12. Then, synthetic resin is injected into the cavities 24 and 25 of the assembled mold 20 through the gate 26.
3 and 4B show an example in which the gate 26 is provided in the cavity 25, and FIGS. 6 and 7 show an example in which the gate 26 is provided in the cavity 24.

図５に示すように、成形された保持器１０は、柱部１２の中央部と環状凸部１４の内側縁とにパーティングラインＬ１， Ｌ２が形成される。そして、この保持器１０は、バレル処理が施され、環状凸部１４のエッジ部が円弧状に加工される。
したがって、保持器１０が組み付けられた円筒ころ軸受を工作機械の主軸用スピンドルに使用することで、安価な保持器で回転がスムーズで、従来のころ案内保持器よりも、低温度上昇であり、且つ高速回転が可能な円筒ころ軸受を得ることができる。 As shown in FIG. 5, in the molded cage 10, parting lines L <b> 1 and L <b> 2 are formed at the center portion of the column portion 12 and the inner edge of the annular convex portion 14. And this cage | basket 10 is barrel-processed and the edge part of the cyclic | annular convex part 14 is processed into circular arc shape.
Therefore, by using the cylindrical roller bearing assembled with the cage 10 for the spindle for the spindle of the machine tool, the rotation is smooth with an inexpensive cage, and the temperature rise is lower than that of the conventional roller guide cage, In addition, a cylindrical roller bearing capable of high-speed rotation can be obtained.

図８乃至図１０は本発明の円筒ころ軸受およびその保持器を成形するための金型の他の実施形態を示している。図８は本発明の円筒ころ軸受の他の実施形態を示す断面図、図９は図８における保持器を成形するための金型の軸芯方向の断面図、図１０は図８における保持器の部分平面図である。   8 to 10 show another embodiment of a mold for molding the cylindrical roller bearing and the cage thereof according to the present invention. 8 is a cross-sectional view showing another embodiment of the cylindrical roller bearing of the present invention, FIG. 9 is a cross-sectional view in the axial direction of the mold for forming the cage in FIG. 8, and FIG. 10 is the cage in FIG. FIG.

図８に示すように、本実施形態の保持器が適用される円筒ころ軸受は、内輪つば付・外輪つば無し（Ｎ型）円筒ころ軸受である。即ち、この軸受では、つばを備えていない外輪１と、つば２ａを両端に備えた内輪２と、両輪１，２間に転動自在に配置した複数のころ３と、該ころ３を保持する保持器３０とを備えている。そして、保持器３０は、外輪１の内周面に案内されている。   As shown in FIG. 8, the cylindrical roller bearing to which the cage of the present embodiment is applied is an inner ring flanged / outer ring flanged (N type) cylindrical roller bearing. That is, in this bearing, an outer ring 1 that does not include a collar, an inner ring 2 that includes a collar 2a at both ends, a plurality of rollers 3 that are rotatably arranged between both wheels 1 and 2, and the rollers 3 are held. And a cage 30. The cage 30 is guided on the inner peripheral surface of the outer ring 1.

図８および図１０に示すように、保持器３０は、一対の環状部３１，３２とそれらの環状部に差し渡された柱部３３とによって円筒ころ３を収容するポケット３４が画成され、一方の環状部３２の外周面に外方へ突出する環状凸部３５が形成されている。   As shown in FIG. 8 and FIG. 10, the retainer 30 has a pair of annular portions 31 and 32 and a column portion 33 inserted between the annular portions to define a pocket 34 that accommodates the cylindrical roller 3. An annular convex portion 35 protruding outward is formed on the outer peripheral surface of one annular portion 32.

保持器３０は、金型４０で射出成形によって成形される。金型４０は、保持器の内周面を形成する金型部分４１と、一方の環状部３１を形成する金型部分４２と、他方の環状部３２を成形する金型部分４３と、ポケット３４および柱部３３を形成するスライドコア４４とによって構成されている。そして、金型４０は、金型部分４１の外周面に金型部分４２，４３を嵌め込み、それらの間にスライドコア４４を嵌め込んで組み付けられる。   The cage 30 is molded by injection molding with the mold 40. The mold 40 includes a mold part 41 that forms the inner peripheral surface of the cage, a mold part 42 that forms one annular part 31, a mold part 43 that molds the other annular part 32, and a pocket 34. And a slide core 44 that forms the column portion 33. The mold 40 is assembled by fitting the mold parts 42 and 43 into the outer peripheral surface of the mold part 41 and fitting the slide core 44 between them.

このように組みつけられた金型４０は、金型部分４１，４２，４３，４４によって、柱部３３が成形されるキャビティ４５と、一方の環状部３１が成形されるキャビティ４６と、環状凸部３５を有する環状部３２が形成されるキャビティ４７が形成される。
この金型４０では、金型部分４１にキャビティ４５又はキャビティ４６，４７に開口するゲート（図示せず）が形成されている。それらのゲートは、上記実施形態と同様にポケット３４の数に対応しており、柱部３３を成形するキャビティ４５若しくはキャビティ４５，４５の間に位置されている。そして、このように組み付けられた金型４０のキャビティ４５，４６，４７には、ゲートを介して合成樹脂が射出される。 The mold 40 assembled in this way includes a cavity 45 in which the column portion 33 is formed, a cavity 46 in which one annular portion 31 is formed, and an annular convex portion by the mold portions 41, 42, 43, 44. A cavity 47 is formed in which the annular part 32 having the part 35 is formed.
In the mold 40, a cavity 45 or a gate (not shown) that opens to the cavities 46 and 47 is formed in the mold portion 41. These gates correspond to the number of pockets 34 as in the above-described embodiment, and are located between the cavities 45 or cavities 45 and 45 for forming the pillars 33. And synthetic resin is inject | poured into the cavity 45, 46, 47 of the metal mold | die 40 assembled in this way through a gate.

図１０に示すように、成形された保持器３０は、柱部３３の中央部と環状部３２の内側縁と環状凸部３５の内側縁とにパーティングラインＬ３， Ｌ４， Ｌ５ が形成される。そして、この保持器３０は、バレル処理が施され、環状凸部３５のエッジ部が円弧状に加工される。   As shown in FIG. 10, in the molded retainer 30, parting lines L 3, L 4, and L 5 are formed at the center of the column portion 33, the inner edge of the annular portion 32, and the inner edge of the annular convex portion 35. . And this holder | retainer 30 is barrel-processed and the edge part of the cyclic | annular convex part 35 is processed into circular arc shape.

図１１及び図１２は本発明の円筒ころ軸受およびその保持器を成形するための金型の他の実施形態を示している。図１１は本発明の円筒ころ軸受の保持器を成形するための他の実施形態を示す金型の軸芯方向の断面図、図１２は図１１における保持器の部分平面図である。   11 and 12 show another embodiment of a mold for forming the cylindrical roller bearing and the cage thereof according to the present invention. FIG. 11 is a sectional view in the axial direction of a mold showing another embodiment for forming a cage of a cylindrical roller bearing of the present invention, and FIG. 12 is a partial plan view of the cage in FIG.

図１１に示すように、本実施形態の円筒ころ軸受の保持器を成形する金型５０は、保持器の内周面を形成する金型部分５１と、一方の環状部３１とポケット３４および柱部３３を形成するスライドコア５２と、他方の環状部３２を成形する金型部分５３とによって構成されている。そして、金型５０は、金型部分５１の外周面に金型部分５３を嵌め込み、金型部分５１，５３にスライドコア５２を嵌め込んで組み付けられる。   As shown in FIG. 11, a mold 50 for molding the cage of the cylindrical roller bearing of the present embodiment includes a mold portion 51 that forms the inner peripheral surface of the cage, one annular portion 31, a pocket 34, and a column. The slide core 52 that forms the portion 33 and the mold portion 53 that molds the other annular portion 32 are configured. The mold 50 is assembled by fitting the mold part 53 into the outer peripheral surface of the mold part 51 and fitting the slide core 52 into the mold parts 51 and 53.

このように組み付けられた金型５０は、金型部分５１，５２，５３によって、柱部３３が成形されるキャビティ５４と、一方の環状部３２が成形されるキャビティ５５と、環状凸部３５を有する環状部３１が形成されるキャビティ５６が形成される。
この金型５０では、金型部分５１にキャビティ５４又はキャビティ５５，５６に開口するゲート（図示せず）が形成されている。それらのゲートは、上記実施形態と同様にポケット３４の数に対応しており、柱部３３を成形するキャビティ５４若しくはキャビティ５４，５４の間に位置されている。そして、このように組み付けられた金型５０のキャビティ５４，５５，５６には、ゲートを介して合成樹脂が射出される。 The mold 50 assembled in this way includes a cavity 54 in which the column part 33 is molded, a cavity 55 in which one annular part 32 is molded, and an annular convex part 35 by the mold parts 51, 52, 53. A cavity 56 is formed in which the annular portion 31 is formed.
In the mold 50, a cavity 54 or a gate (not shown) that opens to the cavities 55 and 56 is formed in the mold portion 51. These gates correspond to the number of pockets 34 as in the above-described embodiment, and are located between the cavities 54 or cavities 54, 54 for forming the pillar portion 33. And synthetic resin is inject | poured into the cavity 54,55,56 of the metal mold | die 50 assembled in this way through a gate.

図１２に示すように、成形された保持器３０は、柱部３３の中央部および環状凸部３５の内側縁とにパーティングラインＬ６， Ｌ７が形成される。そして、この保持器３０は、バレル処理が施され、環状凸部３５のエッジ部が円弧状に加工される。   As shown in FIG. 12, in the molded retainer 30, parting lines L <b> 6 and L <b> 7 are formed at the center portion of the column portion 33 and the inner edge of the annular convex portion 35. And this holder | retainer 30 is barrel-processed and the edge part of the cyclic | annular convex part 35 is processed into circular arc shape.

ゲート数を１０点としたものと、５点としたものについて真円度を測定した結果を図１３（ａ），（ｂ）に示す（ゲート位置を矢印で示す）。
・保持器成形後の真円度形状測定例
ころ数２０個 実施例：１０点ゲート（ａ）
比較例： ５点ゲート（ｂ）
図１３（ａ），（ｂ）でも明らかなように、ゲート数を１０点としたものは５点としたものより真円度が良いことがわかる。 FIGS. 13A and 13B show the results of measuring the roundness of gates with 10 gates and 5 gates (the gate positions are indicated by arrows).
-Example of roundness shape measurement after cage forming 20 rollers Example: 10-point gate (a)
Comparative example: 5-point gate (b)
As is apparent from FIGS. 13A and 13B, the roundness is better when the number of gates is 10 than when the number is 5.

次に、本発明による円筒ころ軸受の保持器を使用しての高速限界試験結果を以下に示す。
・高速限界試験結果
軸受仕様：Ｎ型円筒ころ軸受
内径７０ｍｍ， 外径１１０ｍｍ， ころ径９ｍｍ， ころ長さ９ｍｍ
本発明外輪案内保持器 材質ＰＥＥＫ（射出成形品）
従来外輪案内保持器 材質ＰＥＥＫ（切削加工品）
従来ころ案内保持器 材質ポリアミド６６
試験条件
組込時ラジアル内部隙間 ０μｍ
潤滑 オイルエア潤滑
回転数 軸受が回転不能となるまで回転 Next, the results of the high-speed limit test using the cage of the cylindrical roller bearing according to the present invention are shown below.
・ High-speed limit test results Bearing specifications: N-type cylindrical roller bearing Inner diameter 70mm, Outer diameter 110mm, Roller diameter 9mm, Roller length 9mm
Outer ring guide cage of the present invention Material PEEK (Injection molded product)
Conventional outer ring guide cage Material PEEK (Cutting product)
Conventional roller guide cage Material polyamide 66
Test conditions Radial internal clearance when assembled 0 μm
Lubrication Oil-air lubrication Number of rotations Rotate until the bearing becomes non-rotatable

従来のころ案内保持器では、回転数１８０００ｍｉｎ−１に上げたところ、保持器が破断してしまった。保持器自身の強度（断面形状、材質）が弱く、遠心力による振れ回りと径方向変形量により、ポケット部でころの運動を阻害してしまい、保持器に過大な荷重が負荷して保持器が破断したものである。
一方、本発明の外輪案内保持器は、温度上昇も従来のころ案内保持器より低く、限界回転数も飛躍的に延び、回転数３１０００ｍｉｎ−１を達成し、切削加工品の保持器と略同等の性能を保持しており、本形状が有効であることが確認できた。 In the conventional roller guide cage, when the rotational speed was increased to 18000 min −1 , the cage was broken. The cage itself is weak in strength (cross-sectional shape, material), and the roller's movement is disturbed by the swinging and radial deformation due to centrifugal force, and the cage is overloaded with excessive load. Is broken.
On the other hand, the outer ring guide retainer of the present invention has a temperature rise lower than that of the conventional roller guide retainer, the limit rotational speed extends dramatically, achieves a rotational speed of 31000 min −1 , and is substantially the same as the retainer for a cut product. It was confirmed that this shape was effective.

本発明の円筒ころ軸受の保持器が適用される円筒ころ軸受の断面図である。It is sectional drawing of the cylindrical roller bearing to which the retainer of the cylindrical roller bearing of this invention is applied. 図１における保持器の部分斜視図である。It is a fragmentary perspective view of the holder | retainer in FIG. 図２における保持器を成形するための金型の一例を示す軸芯に対して垂直方向の断面図である。It is sectional drawing of a perpendicular direction with respect to the axial center which shows an example of the metal mold | die for shape | molding the holder | retainer in FIG. 図３における保持器を成形するための金型の軸芯方向の断面図である。It is sectional drawing of the axial center direction of the metal mold | die for shape | molding the holder | retainer in FIG. 図２における保持器の部分平面図である。FIG. 3 is a partial plan view of the cage in FIG. 2. 図２における保持器を成形するための金型の別の例を示す軸芯に対して垂直方向の断面図である。It is sectional drawing of a perpendicular direction with respect to the axial center which shows another example of the metal mold | die for shape | molding the holder | retainer in FIG. 図６における保持器を成形するための金型の軸芯方向の断面図である。It is sectional drawing of the axial center direction of the metal mold | die for shape | molding the holder | retainer in FIG. 本発明の円筒ころ軸受の他の実施形態を示す断面図である。It is sectional drawing which shows other embodiment of the cylindrical roller bearing of this invention. 図８における保持器を成形するための金型の軸芯方向の断面図である。It is sectional drawing of the axial center direction of the metal mold | die for shape | molding the holder | retainer in FIG. 図８における保持器の部分平面図である。It is a fragmentary top view of the holder | retainer in FIG. 本発明の円筒ころ軸受の保持器を成形するための他の実施形態を示す金型の軸芯方向の断面図である。It is sectional drawing of the axial direction of the metal mold | die which shows other embodiment for shape | molding the retainer of the cylindrical roller bearing of this invention. 図１１における保持器の部分平面図である。It is a fragmentary top view of the holder | retainer in FIG. 保持器成形後の真円度形状を１０点ゲートと５点ゲートとで比較した説明図である。It is explanatory drawing which compared the roundness shape after cage shaping | molding with the 10-point gate and the 5-point gate. 従来のラジアルドロー方式の成形型を示す断面図である。It is sectional drawing which shows the shaping | molding die of the conventional radial draw method.

符号の説明Explanation of symbols

１ 外輪
２ 内輪
２ａ つば
３ ころ
１０ 保持器
１１ 環状部
１２ 柱部
１３ ポケット
１４ 環状凸部
２０ 金型
２１，２２ 金型部分
２３ スライドコア
２４，２５ キャビティ
２６ ゲート
３０ 保持器
３１，３２ 環状部
３３ 柱部
３４ ポケット
３５ 環状凸部
４０ 金型
４１，４２，４３ 金型部分
４４ スライドコア
４５，４６，４７ キャビティ
５０ 金型
５１ 金型部分
５２ スライドコア
５３ 金型部分
５４，５５，５６ キャビティ
Ｌ１〜Ｌ７ パーティングライン DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 2a Collar 3 Roller 10 Cage 11 Annular part 12 Column part 13 Pocket 14 Annular convex part 20 Die 21, 22 Die part 23 Slide core 24, 25 Cavity 26 Gate 30 Cage 31, 32 Annular part 33 Column part 34 Pocket 35 Annular convex part 40 Die 41, 42, 43 Die part 44 Slide core 45, 46, 47 Cavity 50 Die 51 Die part 52 Slide core 53 Die part 54, 55, 56 Cavity L1 L7 Parting line

Claims (6)

一対の環状部とそれらの環状部に差し渡された柱部とによって円筒ころを収容するポケットが画成され、前記一対の環状部のうちの少なくとも一方の環状部の外周面に外方へ突出する環状凸部が形成され、その環状凸部の外周面を外輪の内周面に当接させて介装される保持器を備えた円筒ころ軸受において、
前記保持器が、金型の合わせ部を前記保持器上の非案内部に位置させて射出成形することで形成されることを特徴とする円筒ころ軸受。 A pair of annular portions and a column portion extending between the annular portions define a pocket for accommodating the cylindrical rollers, and project outwardly on the outer peripheral surface of at least one annular portion of the pair of annular portions. In the cylindrical roller bearing provided with a cage that is formed with an annular convex portion that is interposed between the outer circumferential surface of the annular convex portion and the inner circumferential surface of the outer ring.
A cylindrical roller bearing, wherein the cage is formed by injection molding with a matching portion of a mold positioned at a non-guide portion on the cage. 前記保持器のポケットを形成するスライドコアの合わせ部が、前記柱部に位置させて射出成形することで形成されることを特徴とする請求項１に記載の円筒ころ軸受。   2. The cylindrical roller bearing according to claim 1, wherein a mating portion of a slide core that forms a pocket of the cage is formed by injection molding while being positioned at the column portion. 前記柱部に射出成形時のウエルド部が位置されることを特徴とする請求項１又は２に記載の円筒ころ軸受。   The cylindrical roller bearing according to claim 1, wherein a weld portion at the time of injection molding is positioned on the column portion. 前記保持器の射出成形時のゲート数が、前記ポケット数と同数であることを特徴とする請求項１〜３のいずれかに記載の円筒ころ軸受。   The cylindrical roller bearing according to claim 1, wherein the number of gates of the cage during injection molding is the same as the number of pockets. 前記保持器の前記ポケット数が偶数個に設定され、射出成形時のゲート数が前記ポケット数の１／２であることを特徴とする請求項１〜３のいずれかに記載の円筒ころ軸受。   The cylindrical roller bearing according to claim 1, wherein the number of pockets of the cage is set to an even number, and the number of gates at the time of injection molding is ½ of the number of pockets. 前記保持器が、射出成形後にバレル処理を施されることを特徴とする請求項１〜５のいずれかに記載の円筒ころ軸受。   The cylindrical roller bearing according to claim 1, wherein the cage is subjected to barrel processing after injection molding.
JP2005092987A 2005-03-28 2005-03-28 Cylindrical roller bearing Withdrawn JP2005201457A (en)

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Cited By (8)

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Publication number Priority date Publication date Assignee Title
JP2009052657A (en) * 2007-08-27 2009-03-12 Ntn Corp Retainer for tapered roller bearing
JP2009204063A (en) * 2008-02-27 2009-09-10 Ntn Corp Tapered roller bearing cage manufacturing method, and tapered roller bearing
JP2011226495A (en) * 2010-04-15 2011-11-10 Ntn Corp Retainer for conical bearing, retainer manufacturing method, and conical bearing
JP2012107764A (en) * 2012-03-09 2012-06-07 Ntn Corp Tapered roller bearing cage
DE102011080797A1 (en) * 2011-08-11 2013-02-14 Aktiebolaget Skf Injection molding tool for manufacturing one-piece bearing cage for roller bearing, has axial intermediate arrangement for molding of axial bar elements utilized for forming rolling member pocket of bearing cage
JP2017072206A (en) * 2015-10-08 2017-04-13 中西金属工業株式会社 Outer ring guide resin cage, injection molding die and process of manufacture of outer ring guide resin cage
CN107246442A (en) * 2013-04-04 2017-10-13 日本精工株式会社 Taper roll bearing of the taper roll bearing with resin-made retainer and with the retainer
CN114269541A (en) * 2019-10-08 2022-04-01 中西金属工业株式会社 Method for manufacturing double-ring resin retainer

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009052657A (en) * 2007-08-27 2009-03-12 Ntn Corp Retainer for tapered roller bearing
JP2009204063A (en) * 2008-02-27 2009-09-10 Ntn Corp Tapered roller bearing cage manufacturing method, and tapered roller bearing
JP2011226495A (en) * 2010-04-15 2011-11-10 Ntn Corp Retainer for conical bearing, retainer manufacturing method, and conical bearing
US8801295B2 (en) 2010-04-15 2014-08-12 Ntn Corporation Retainer for tapered roller bearing, method for manufacturing retainer, and tapered roller bearing
DE102011080797A1 (en) * 2011-08-11 2013-02-14 Aktiebolaget Skf Injection molding tool for manufacturing one-piece bearing cage for roller bearing, has axial intermediate arrangement for molding of axial bar elements utilized for forming rolling member pocket of bearing cage
JP2012107764A (en) * 2012-03-09 2012-06-07 Ntn Corp Tapered roller bearing cage
CN107246442A (en) * 2013-04-04 2017-10-13 日本精工株式会社 Taper roll bearing of the taper roll bearing with resin-made retainer and with the retainer
CN107246442B (en) * 2013-04-04 2019-10-25 日本精工株式会社 Tapered roller bearing resin retainer and with the tapered roller bearing of the retainer
JP2017072206A (en) * 2015-10-08 2017-04-13 中西金属工業株式会社 Outer ring guide resin cage, injection molding die and process of manufacture of outer ring guide resin cage
CN114269541A (en) * 2019-10-08 2022-04-01 中西金属工业株式会社 Method for manufacturing double-ring resin retainer

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