JP2017129276A - Cage of deep groove ball bearing - Google Patents

Cage of deep groove ball bearing Download PDF

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JP2017129276A
JP2017129276A JP2017043405A JP2017043405A JP2017129276A JP 2017129276 A JP2017129276 A JP 2017129276A JP 2017043405 A JP2017043405 A JP 2017043405A JP 2017043405 A JP2017043405 A JP 2017043405A JP 2017129276 A JP2017129276 A JP 2017129276A
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ball
shoulder
cage
inner ring
split
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貴裕 和久田
Takahiro Wakuta
貴裕 和久田
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a deep groove ball bearing which secures the assembling performance of a ball, and is improved in thrust load resistance.SOLUTION: A ball 31 is assembled between a raceway groove 12 of an outer ring 11 and a raceway groove 22 of an inner ring 21, and the ball 31 is held by a first split cage 41 and a second split cage 42 which is fit to the inside of the first split cage. A shoulder 13a provided at one side of the outer ring raceway groove and a shoulder 23b provided at the other side of the inner ring raceway groove are set higher than other shoulders 13b and 23a. A large thrust load can be supported by bringing a ratio H/d between a shoulder height Hof the shoulder 23b at the other side of the inner ring and a ball diameter d of the ball fall into a range exceeding 0.50 and lower than 0.52. A distance which is obtained by adding an inter-shoulder distance at one-end sides of the outer ring and the inner ring and an inter-shoulder distance at the other side is set longer than the ball diameter d of the ball, the outer ring and the inner ring are offset with respect to each other in a radial direction, and a clearance into which the ball can be assembled is formed at a part of a peripheral direction between the other end sides of the outer ring and the inner ring in a state in which a part of an external periphery of the shoulder 23b of the inner ring at the other side is made to abut on a part of an internal periphery of the shoulder 13b of the outer ring at the other side.SELECTED DRAWING: Figure 1

Description

この発明は、外輪と内輪間にボールを組み込んだ深みぞ玉軸受に関する。   The present invention relates to a deep groove ball bearing in which a ball is incorporated between an outer ring and an inner ring.

インプットシャフトとアウトプットシャフトを同軸上に配置し、その両軸に平行にカウンタシャフトを設け、その平行する２軸の相互間に変速比の異なる複数の歯車式減速部を設けて、インプットシャフトの回転を複数段に変速してアウトプットシャフトから出力するようにしたトランスミッションにおいては、一般的に、歯車式減速部にヘリカルギヤを採用しているため、インプットシャフトからアウトプットシャフトへの回転トルクの伝達時、インプットシャフト、アウトプットシャフトおよびカウンタシャフトのそれぞれにスラスト力が負荷されることになる。   The input shaft and the output shaft are arranged on the same axis, the countershaft is provided in parallel to both axes, and a plurality of gear-type reduction gears with different gear ratios are provided between the two parallel axes to rotate the input shaft. In a transmission that shifts to multiple stages and outputs from the output shaft, a helical gear is generally used for the gear-type reduction gear, so input torque is transmitted from the input shaft to the output shaft. A thrust force is applied to each of the shaft, the output shaft, and the counter shaft.

このため、インプットシャフト、アウトプットシャフトおよびカウンタシャフトを支持する軸受には、ラジアル荷重とスラスト荷重の両方の荷重を支持することができる軸受を用いる必要がある。   For this reason, it is necessary to use a bearing that can support both a radial load and a thrust load as a bearing that supports the input shaft, the output shaft, and the counter shaft.

円すいころ軸受においては、負荷容量が大きく、スラスト荷重およびラジアル荷重の両方を受けることができるため、トランスミッション用の軸受に好適である。しかし、円すいころ軸受においては、損失トルクが大きく、燃料の消費量が多くなるという問題が生じる。その低燃費化を図るため、トルク損失の少ない深みぞ玉軸受が使用されるケースが多くなってきている。   Tapered roller bearings are suitable for transmission bearings because they have a large load capacity and can receive both thrust loads and radial loads. However, in the tapered roller bearing, there is a problem that the loss torque is large and the amount of fuel consumption increases. In order to reduce the fuel consumption, deep groove ball bearings with less torque loss are often used.

ところで、標準の深みぞ玉軸受においては、過大なスラスト荷重が負荷された際に、そのスラスト荷重を受ける負荷側の肩にボールが乗り上げて、肩のエッジが損傷する懸念がある。   By the way, in a standard deep groove ball bearing, when an excessive thrust load is applied, there is a concern that the ball rides on the load-side shoulder receiving the thrust load and the shoulder edge is damaged.

そのような不都合を解消するため、特許文献１に記載された深みぞ玉軸受においては、外輪の軌道溝および内輪の軌道溝のそれぞれ両側に形成された肩のうち、スラスト荷重を受ける側の肩を高くして、ボールの乗り上げを阻止し、軸受の耐久性の低下を抑制して、大きなスラスト荷重を受けることができるようにしている。   In order to eliminate such inconvenience, in the deep groove ball bearing described in Patent Document 1, of the shoulders formed on both sides of the outer ring raceway groove and the inner ring raceway groove, the shoulder receiving the thrust load Is increased to prevent the ball from climbing, to suppress a decrease in the durability of the bearing, and to receive a large thrust load.

特開２０１１−７２８６号公報JP 2011-7286 A

ところで、上記特許文献１に記載された深みぞ玉軸受においては、外輪および内輪の高さの高い肩の肩高さをＨ１、ボールの球径をｄとしたとき、ボールの球径ｄに対する肩高さＨ１の比率Ｈ１／ｄを０．２５〜０．５０未満の範囲としているため、耐スラスト荷重性に優れているという特徴を有している。また、軸受の左右いずれの方向からもボールを組み込むことができ、組込み性にも優れている特徴を有している。近年では、ボールの組込み性を確保する状態で上記深みぞ玉軸受の耐スラスト荷重性をさらに向上させて欲しいとの要望がある。 By the way, in the deep groove ball bearing described in the above-mentioned Patent Document 1, when the shoulder height of the high shoulder of the outer ring and the inner ring is H 1 and the ball diameter of the ball is d, it corresponds to the ball diameter d. Since the ratio H 1 / d of the shoulder height H 1 is in the range of 0.25 to less than 0.50, it has a feature of excellent thrust load resistance. In addition, the ball can be incorporated from either the left or right direction of the bearing, and has a feature that it is excellent in assemblability. In recent years, there has been a demand for further improvement of the thrust load resistance of the above-mentioned deep groove ball bearing in a state in which the ball can be incorporated.

この発明の課題は、ボールの組込み性を確保する状態で耐スラスト荷重性を向上させることができるようにした深みぞ玉軸受を提供することである。   An object of the present invention is to provide a deep groove ball bearing capable of improving the thrust load resistance in a state in which the ball can be incorporated.

上記の課題を解決するために、この発明においては、内径面に軌道溝が形成された外輪と、外径面に軌道溝が形成された内輪と、外輪の軌道溝と内輪の軌道溝間に組込まれたボールおよびそのボールを保持する保持器とからなり、前記外輪における軌道溝の一側の肩および前記内輪における軌道溝の他側の肩の高さを、外輪の他側の肩および前記内輪の一側の肩の高さより高くし、外輪の高さの高い肩の肩高さをＨ１、ボールの球径をｄとしたとき、ボールの球径ｄに対する肩高さＨ１の比率Ｈ１／ｄを０．２５を超える大きさとし、前記保持器が、円筒形の第１分割保持器と、その第１分割保持器の内側に挿入される円筒形の第２分割保持器からなり、前記第１分割保持器と第２分割保持器の前記ボールと対向する側部に、その両分割保持器を内外に組み合わせた状態でボール保持用の円形のポケットを形成する切欠部を周方向に間隔をおいて設け、前記第１分割保持器と第２分割保持器が円形のポケットを形成する組み合わせ状態で、その両分割保持器を軸方向に非分離とする連結手段を設けた深みぞ玉軸受において、前記第１分割保持器と第２分割保持器によって形成される円形ポケットのピッチ径中心がボールのピッチ径中心に一致する状態で、前記第１分割保持器の径方向厚さを前記第２分割保持器の径方向厚さより薄くし、前記内輪の高さの高い肩の肩高さＨ２のボールの球径ｄに対する比率Ｈ２／ｄを０．５０を超えて０．５２未満の範囲内とし、外輪と内輪の一側の肩間距離と他側の肩間距離の合計をボールの球径よりも大きくした構成を採用したのである。 In order to solve the above problems, in the present invention, an outer ring having a raceway groove formed on the inner diameter surface, an inner ring having a raceway groove formed on the outer diameter surface, and a raceway groove between the outer ring and the raceway groove of the inner ring. And a cage for holding the ball. The height of the shoulder on one side of the raceway groove on the outer ring and the shoulder on the other side of the raceway groove on the inner ring is set to the shoulder on the other side of the outer ring and the shoulder higher than the height of the inner ring on one side of the shoulder, H 1 a shoulder height of the tall of the outer ring shoulder, when the spherical diameter of the ball was d, the ratio shoulder height H 1 relative to the spherical diameter d of the ball H 1 / d has a size exceeding 0.25, and the cage includes a cylindrical first divided cage and a cylindrical second divided cage inserted inside the first divided cage. , Both sides of the first split cage and the second split cage on the side facing the ball A notch portion for forming a circular pocket for holding a ball in a state where the holder is combined inside and outside is provided at intervals in the circumferential direction, and the first divided holder and the second divided holder form a circular pocket. In a deep groove ball bearing provided with a coupling means for non-separating both split cages in the axial direction in a combined state, the center of the pitch diameter of the circular pocket formed by the first split cage and the second split cage Is equal to the pitch diameter center of the ball, the radial thickness of the first split cage is made thinner than the radial thickness of the second split cage, and the shoulder height of the shoulder having a high inner ring height is set. The ratio H 2 / d of H 2 to the ball diameter d is within the range of more than 0.50 and less than 0.52, and the sum of the distance between the shoulders on one side of the outer ring and the inner ring and the distance between the shoulders on the other side is The configuration was made larger than the ball diameter.

上記のように、第１分割保持器と第２分割保持器によって形成される円形ポケットのピッチ径中心がボールのピッチ径中心に一致する状態で、前記第１分割保持器の径方向厚さを第２分割保持器の径方向厚さより薄くすることにより、第１分割保持器の内径がボールのピッチ径より大径とされるため、内輪の高さの高い肩の外径をボールのピッチ径より大きな範囲に設定することができる。   As described above, in the state where the pitch diameter center of the circular pocket formed by the first divided cage and the second divided cage coincides with the pitch diameter center of the ball, the radial thickness of the first divided cage is set. By making it thinner than the radial thickness of the second split cage, the inner diameter of the first split cage is made larger than the pitch diameter of the ball, so the outer diameter of the shoulder with a high inner ring height is set to the pitch diameter of the ball. A larger range can be set.

そこで、内輪の高さの高い肩の肩高さＨ２のボールの球径ｄに対する比率Ｈ２／ｄを０．５０を超えて０．５２未満の範囲内とすることによって、耐スラスト荷重性の向上を図ることができると共に、外輪と内輪の一側の肩間距離と他側の肩間距離の合計をボールの球径よりも大きくすることにより、内輪と外輪を径方向に相対的にオフセットすることによって、内輪の高さの低い肩と外輪の高さの高い肩の対向部間にボールを組込み可能とする間隙が形成されることになり、ボールの組込み性を確保する状態で耐スラスト荷重性の向上を図ることができる。 Therefore, by making the ratio H 2 / d of the shoulder height H 2 of the shoulder with a high inner ring height to the ball diameter d within the range of more than 0.50 and less than 0.52, the thrust load resistance is improved. By making the sum of the distance between the shoulders on one side of the outer ring and the inner ring and the distance between the shoulders on the other side larger than the ball diameter, the inner ring and the outer ring can be relatively moved in the radial direction. By offsetting, a gap that allows the ball to be incorporated is formed between the opposing portions of the shoulder with the lower inner ring height and the shoulder with the higher outer ring height. Thrust loadability can be improved.

ここで、第１分割保持器の外径および第２分割保持器の内径、つまり、第１分割保持器と第２分割保持器とで形成される保持器の径方向の厚さは、ボールのピッチ径により決定される設計事項であり、第１分割保持器の径方向厚さが極端に薄くなると、強度を確保することができなくなって耐久性に問題が生じる。そこで、第１分割保持器と第２分割保持器の厚さの比を９：１１とすることにより、第１分割保持器の強度を確保する状態で深みぞ玉軸受の耐スラスト荷重性を向上させることができる。   Here, the outer diameter of the first split cage and the inner diameter of the second split cage, that is, the radial thickness of the cage formed by the first split cage and the second split cage is the ball This is a design matter determined by the pitch diameter, and if the radial thickness of the first split cage is extremely thin, the strength cannot be ensured, resulting in a problem in durability. Therefore, by setting the ratio of the thickness of the first split cage to the second split cage to 9:11, the thrust load resistance of the deep groove ball bearing is improved while ensuring the strength of the first split cage. Can be made.

この発明においては、上記のように、第１分割保持器の径方向厚さを第２分割保持器の径方向厚さより薄くし、内輪の高さの高い肩の肩高さＨ２のボールの球径ｄに対する比率Ｈ２／ｄを０．５０を超えて０．５２未満の範囲内とし、外輪と内輪の一側の肩間距離と他側の肩間距離の合計をボールの球径よりも大きくしたことにより、ボールの組込み性を確保する状態で深みぞ玉軸受の耐スラスト荷重性を向上させることができる。 In the present invention, as described above, the radial thickness of the first split cage thinner than the radial thickness of the second split cage, the high inner height shoulder shoulder height H 2 of the ball The ratio H 2 / d to the sphere diameter d is within the range of more than 0.50 and less than 0.52, and the sum of the distance between the shoulders on one side of the outer ring and the inner ring and the distance between the shoulders on the other side is calculated from the ball diameter of the ball. As a result, the thrust load resistance of the deep groove ball bearing can be improved in a state in which the ball can be assembled.

この発明に係る深みぞ玉軸受の実施の形態を示す縦断面図Longitudinal sectional view showing an embodiment of a deep groove ball bearing according to the present invention 図１の一部を拡大して示す断面図Sectional drawing which expands and shows a part of FIG. 第１分割保持器と第２分割保持器の一部分を示す平面図The top view which shows a part of a 1st division | segmentation holder | retainer and a 2nd division | segmentation holder | retainer 外輪と内輪のオフセット状態を示す断面図Sectional view showing offset state of outer ring and inner ring

以下、この発明の実施の形態を図面に基づいて説明する。図１および図２に示すように、深みぞ玉軸受Ａは、外輪１１と、内輪２１と、外輪１１の内径面に形成された軌道溝１２と内輪２１の外径面に設けられた軌道溝２２間に組み込まれたボール３１と、そのボール３１を保持する保持器４０とを有している。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the deep groove ball bearing A includes an outer ring 11, an inner ring 21, a raceway groove 12 formed on the inner diameter surface of the outer ring 11, and a raceway groove provided on the outer diameter surface of the inner ring 21. 22 has a ball 31 incorporated between the two and a retainer 40 for holding the ball 31.

外輪１１の軌道溝１２の両側に形成された一対の肩１３ａ、１３ｂのうち、軌道溝１２の一側方に位置する肩１３ａの高さは他側方に位置する肩１３ｂの高さよりも高くなっている。一方、内輪２１の軌道溝２２の両側に形成された一対の肩２３ａ、２３ｂのうち、軌道溝２２の他側方に位置する肩２３ｂの高さは一側方に位置する肩２３ａの高さより高くなっている。   Of the pair of shoulders 13a and 13b formed on both sides of the raceway groove 12 of the outer ring 11, the height of the shoulder 13a located on one side of the raceway groove 12 is higher than the height of the shoulder 13b located on the other side. It has become. On the other hand, of the pair of shoulders 23a and 23b formed on both sides of the raceway groove 22 of the inner ring 21, the height of the shoulder 23b located on the other side of the raceway groove 22 is higher than the height of the shoulder 23a located on one side. It is high.

ここで、高さの低い肩１３ｂおよび２３ａの肩の高さは、ＪＩＳに規定される標準型深みぞ玉軸受の肩と同じ高さとされているが、標準型深みぞ玉軸受の肩の高さより低くしてもよい。   Here, the shoulder heights of the low shoulders 13b and 23a are the same as the shoulders of the standard type deep groove ball bearings defined in JIS, but the shoulder heights of the standard type deep groove ball bearings are the same. It may be lower.

なお、説明の都合上、高さの高い肩１３ａ、２３ｂをスラスト負荷側の肩１３ａ、２３ｂといい、高さの低い肩１３ｂ、２３ａを非スラスト負荷側の肩１３ｂ、２３ａという。   For convenience of explanation, the high shoulders 13a and 23b are referred to as thrust load side shoulders 13a and 23b, and the low height shoulders 13b and 23a are referred to as non-thrust load side shoulders 13b and 23a.

外輪１１のスラスト負荷側の肩１３ａの肩高さをＨ１、内輪２１のスラスト負荷側の肩２３ｂの肩高さをＨ２、ボール３１の球径をｄとすると、ボール３１の球径ｄに対する内輪２１の肩高さＨ２の比率Ｈ２／ｄは、０．５０を超えて０．５２未満の範囲とされている。 When the shoulder height of the shoulder 13a on the thrust load side of the outer ring 11 is H 1 , the shoulder height of the shoulder 23b on the thrust load side of the inner ring 21 is H 2 , and the ball diameter of the ball 31 is d, the ball diameter d of the ball 31 The ratio H 2 / d of the shoulder height H 2 of the inner ring 21 with respect to is in the range of more than 0.50 and less than 0.52.

一方、ボール３１の球径ｄに対する外輪１１の肩高さＨ１の比率Ｈ１／ｄは、０．２５を超える高さが下限値とされ、上限値については、外輪１１のスラスト負荷側の肩１３ａと内輪２１の非スラスト負荷側の肩２３ａ間の距離をＬ１とし、外輪１１の非スラスト負荷側の肩１３ｂと内輪２１のスラスト負荷側の肩２３ｂ間の距離をＬ２としたとき、その２つの距離Ｌ１、Ｌ２を加えた大きさ（Ｌ１＋Ｌ２）がボール３１の球径ｄより大きくなるような高さ寸法とされている。 On the other hand, the ratio H 1 / d of the shoulder height H 1 of the outer ring 11 with respect to the ball diameter d of the ball 31 has a lower limit value that exceeds 0.25, and the upper limit value is the thrust load side of the outer ring 11 on the thrust load side. the distance between the non-thrust load side of the shoulder 23a of the shoulder 13a and the inner ring 21 and L 1, when the distance between the shoulder 23b of the thrust load side of the non-thrust load side of the shoulder 13b and the inner ring 21 of the outer ring 11 was set to L 2 The height (L 1 + L 2 ) of the two distances L 1 and L 2 is larger than the ball diameter d of the ball 31.

図１および図３に示すように、保持器４０は、第１分割保持器４１と、第２分割保持器４２とからなる。第１分割保持器４１および第２分割保持器４２のそれぞれは、複数の切欠部４３を一側部に有する冠形分割保持器からなり、上記切欠部４３は、１／２円を超える大きさの円形とされて開口部に対向一対のポケット爪４４を有し、その内周はボール３１の外周に沿う球面状とされている。   As shown in FIGS. 1 and 3, the holder 40 includes a first divided holder 41 and a second divided holder 42. Each of the first divided holder 41 and the second divided holder 42 is formed of a crown-shaped divided holder having a plurality of cutout portions 43 on one side, and the cutout portion 43 has a size exceeding 1/2 circle. The opening has a pair of opposed pocket claws 44 at the opening, and the inner periphery thereof is a spherical shape along the outer periphery of the ball 31.

第１分割保持器４１の内径は第２分割保持器４２の外径より小径とされ、第１分割保持器４１内に第２分割保持器４２が嵌合可能とされている。   The inner diameter of the first divided holder 41 is smaller than the outer diameter of the second divided holder 42, and the second divided holder 42 can be fitted into the first divided holder 41.

また、第１分割保持器４１は、外輪１１の高さの低い非スラスト負荷側の肩１３ｂと内輪２１の高さの高いスラスト負荷側の肩２３ｂの対向面間から軸受内部に挿入可能とされている。一方、第２分割保持器４２は、外輪１１の高さの高いスラスト負荷側の肩１３ａと内輪２１の高さの低い非スラスト負荷側の肩２３ａの対向面間から軸受内部に挿入可能とされている。   Further, the first split cage 41 can be inserted into the bearing from between the opposing surfaces of the shoulder 13b on the non-thrust load side where the outer ring 11 is low and the shoulder 23b on the thrust load side where the inner ring 21 is high. ing. On the other hand, the second split cage 42 can be inserted into the bearing from the opposed surfaces of the shoulder 13a on the thrust load side where the height of the outer ring 11 is high and the shoulder 23a on the non-thrust load side where the height of the inner ring 21 is low. ing.

第１分割保持器４１と第２分割保持器４２は、内外に嵌合されて切欠部４３が球状のポケット４５を形成する組み合わせとされる。その組み合わせにおいて、連結手段５０により、第１分割保持器４１と第２分割保持器４２は軸方向に非分離とされる。   The first split holder 41 and the second split holder 42 are combined in such a manner that the cutout portion 43 forms a spherical pocket 45 by being fitted inside and outside. In the combination, the first split holder 41 and the second split holder 42 are not separated in the axial direction by the connecting means 50.

図２および図３に示すように、連結手段５０は、第１分割保持器４１の隣接する切欠部４３のポケット爪４４間に内向きの係合爪５１を設け、かつ、内径面に上記係合爪５１と同一軸線上に溝状の係合凹部５２を形成し、第２分割保持器４２の隣接する切欠部４３のポケット爪４４間に外向きの係合爪５３を設け、かつ、外径面に上記係合爪５３と同一軸線上に係合凹部５４を形成し、第１分割保持器４１の係合爪５１と第２分割保持器４２の係合凹部５４の係合、および、第２分割保持器４２の係合爪５３と第１分割保持器４１の係合凹部５２の係合によって、第１分割保持器４１と第２分割保持器４２とを軸方向に非分離とする構成とされている。   As shown in FIGS. 2 and 3, the connecting means 50 is provided with an inward engagement claw 51 between the pocket claws 44 of the adjacent cutout portions 43 of the first split holder 41, and the above-described engagement on the inner diameter surface. A groove-like engagement recess 52 is formed on the same axis as the joint pawl 51, an outward engagement pawl 53 is provided between the pocket pawls 44 of the adjacent notches 43 of the second split cage 42, and the outer An engagement recess 54 is formed on the radial surface on the same axis as the engagement claw 53, and the engagement claw 51 of the first split holder 41 and the engagement recess 54 of the second split holder 42 are engaged, and The first split holder 41 and the second split holder 42 are not separated in the axial direction by the engagement of the engaging claw 53 of the second split holder 42 and the engaging recess 52 of the first split holder 41. It is configured.

図１に示すように、保持器４０がボール３１を保持する状態において、第１分割保持器４１の切欠部４３と第２分割保持器４２の切欠部４３によって形成される円形ポケット４５のピッチ径Ｄ２はボール３１のピッチ径Ｄ１と同径とされている。そして、図２に示すように、円形ポケット４５のピッチ径Ｄ２の中心Ｏ２がボール３１のピッチ径Ｄ１の中心Ｏ１に一致する状態において、ポケット４５のピッチ径中心Ｏ２と保持器４０の外径面および内径面までの厚さは等しくされている。 As shown in FIG. 1, the pitch diameter of the circular pocket 45 formed by the cutout portion 43 of the first divided holder 41 and the cutout portion 43 of the second divided holder 42 in a state where the holder 40 holds the ball 31. D 2 is the same diameter as the pitch diameter D 1 of the balls 31. Then, as shown in FIG. 2, in a state where the center O 2 of the pitch diameter D 2 of the circular pockets 45 coincides with the center O 1 of the pitch diameter D 1 of the ball 31, the cage and the pitch diameter center O 2 of the pocket 45 The thicknesses up to the outer diameter surface and the inner diameter surface of 40 are made equal.

また、第１分割保持器４１の径方向の厚さをＴ１とし、第２分割保持器４２の径方向の厚さをＴ２としたとき、第１分割保持器４１の径方向の厚さＴ１は第２分割保持器４２の径方向の厚さＴ２より薄くされ、その比率Ｔ１：Ｔ２は、Ｔ１：Ｔ２＝９：１１とされ、第１分割保持器４１の内径はボール３１のピッチ径Ｄ１より大径とされている。 Further, a radial thickness of the first split cage 41 and T 1, when the radial thickness of the second split cage 42 was set to T 2, the thickness in the radial direction of the first split cage 41 T 1 is made thinner than the radial thickness T 2 of the second split cage 42, and the ratio T 1 : T 2 is T 1 : T 2 = 9: 11, and the inner diameter of the first split cage 41 Is larger than the pitch diameter D 1 of the balls 31.

実施の形態で示す深みぞ玉軸受は上記の構造からなり、その深みぞ玉軸受の組立てに際しては、外輪１１内に内輪２１を挿入し、その両輪１１、２１を径方向にオフセットして、内輪２１のスラスト負荷側の肩２３ｂの外周一部を外輪１１の非スラスト負荷側の肩１３ｂの内周一部に当接させる。   The deep groove ball bearing shown in the embodiment has the above-described structure, and when the deep groove ball bearing is assembled, the inner ring 21 is inserted into the outer ring 11 and both the wheels 11 and 21 are offset in the radial direction so that the inner ring A part of the outer periphery of the shoulder 23 b on the thrust load side of 21 is brought into contact with a part of the inner periphery of the shoulder 13 b on the non-thrust load side of the outer ring 11.

図４は、内輪２１の他側に設けられたスラスト負荷側の肩２３ｂの外周一部を外輪１１の他側に設けられた非スラスト負荷側の肩１３ｂの内周一部に当接させた状態を示し、その当接により、外輪１１と内輪２１の一側部において、当接部から周方向に１８０°ずれた位置に三日月形の間隙Ｇが形成される。   4 shows a state in which a part of the outer periphery of the shoulder 23b on the thrust load side provided on the other side of the inner ring 21 is in contact with a part of the inner periphery of the shoulder 13b on the non-thrust load side provided on the other side of the outer ring 11. As a result of the contact, a crescent-shaped gap G is formed on one side of the outer ring 11 and the inner ring 21 at a position shifted by 180 ° in the circumferential direction from the contact part.

このとき、内輪２１のスラスト負荷側の肩２３ｂの肩高さＨ２はボール３１の球径ｄに対して、比率Ｈ２／ｄが０．５０を超えて０．５２未満の範囲とされており、また、外輪１１のスラスト負荷側の肩１３ａと内輪２１の非スラスト負荷側の肩２３ａ間の距離Ｌ１と外輪１１の非スラスト負荷側の肩１３ｂと内輪２１のスラスト負荷側の肩２３ｂ間の距離をＬ２を加えた大きさ（Ｌ１＋Ｌ２）がボール３１の球径ｄより大きくなるような高さ寸法とされているため、外輪１１と内輪２１の一側部にボール３１の球径ｄより大きな間隙Ｇが形成されることになり、その間隙Ｇから外輪１１と内輪２１間に必要数のボール３１を組み込むことができる。 In this case, shoulder height H 2 of the thrust load side of the shoulder 23b of the inner ring 21 for the sphere diameter d of ball 31, and the ratio H 2 / d is in the range of less than 0.52 exceeds 0.50 cage, also, the distance L 1 and the non-thrust load side of the shoulder 13b and thrust load side of the shoulder 23b of the inner ring 21 of the outer ring 11 between the non-thrust load side of the shoulder 23a of the thrust load side of the shoulder 13a and the inner ring 21 of the outer ring 11 since the magnitude of the distance between plus L 2 (L 1 + L 2 ) is the height that is larger than the spherical diameter d of the ball 31, the ball 31 on one side of the outer ring 11 and inner ring 21 A gap G larger than the spherical diameter d is formed, and a necessary number of balls 31 can be incorporated between the outer ring 11 and the inner ring 21 from the gap G.

必要数のボール３１の組込み後、外輪１１と内輪２１の軸心を一致させ、外輪１１の高さの低い非スラスト負荷側の肩１３ｂと内輪２１の高さの高いスラスト負荷側の肩２３ｂの対向面間から軸受内部に第１分割保持器４１を挿入し、外輪１１の高さの高いスラスト負荷側の肩１３ａと内輪２１の高さの低い非スラスト負荷側の肩２３ａの対向面間から軸受内部に第２分割保持器４２を挿入することにより、第１分割保持器４１と第２分割保持器４２は連結手段５０により軸方向に非分離とされ、深みぞ玉軸受の組立てが完了する。   After assembling the required number of balls 31, the axial centers of the outer ring 11 and the inner ring 21 are aligned, and the shoulder 13 b on the non-thrust load side with the lower height of the outer ring 11 and the shoulder 23 b on the thrust load side with the higher height of the inner ring 21. The first split cage 41 is inserted into the bearing from between the opposed surfaces, and between the opposed surfaces of the shoulder 13a on the thrust load side where the height of the outer ring 11 is high and the shoulder 23a on the non-thrust load side where the height of the inner ring 21 is low. By inserting the second divided cage 42 into the bearing, the first divided cage 41 and the second divided cage 42 are not separated in the axial direction by the connecting means 50, and the assembly of the deep groove ball bearing is completed. .

実施の形態においては、内輪２１の他側に設けられたスラスト負荷側の肩２３ｂの高さＨ２をボールの球径ｄに対しての比率Ｈ２／ｄを０．５０を超えて０．５２未満の範囲内としているため、極めて大きなスラスト荷重を支持することができ、耐スラスト荷重性に優れた深みぞ玉軸受を得ることができる。 In the embodiment, the height H 2 of the shoulder 23b on the thrust load side provided on the other side of the inner ring 21 is set to a ratio H 2 / d with respect to the ball diameter d of the ball exceeding 0.50. Since it is within the range of less than 52, an extremely large thrust load can be supported, and a deep groove ball bearing excellent in thrust load resistance can be obtained.

また、外輪１１と内輪２１を径方向に相対的にオフセットすることにより、外輪１１のスラスト負荷側の肩１３ａと内輪２１の非スラスト負荷側の肩２３ａの対向部間にボール３１を組込み可能とする間隙Ｇが形成されるため、ボール３１の組込み性を確保する状態で耐スラスト荷重性の向上を図ることができる。   Further, by relatively offsetting the outer ring 11 and the inner ring 21 in the radial direction, the ball 31 can be assembled between the opposing portions of the shoulder 13a on the thrust load side of the outer ring 11 and the shoulder 23a on the non-thrust load side of the inner ring 21. Since the gap G is formed, the thrust load resistance can be improved in a state where the ball 31 can be incorporated.

１１ 外輪
１２ 軌道溝
１３ａ 肩
１３ｂ 肩
２１ 内輪
２２ 軌道溝
２３ａ 肩
２３ｂ 肩
３１ ボール
４０ 保持器
４１ 第１分割保持器
４２ 第２分割保持器
４３ 切欠部
４５ ポケット
５０ 連結手段 11 outer ring 12 raceway groove 13a shoulder 13b shoulder 21 inner ring 22 raceway groove 23a shoulder 23b shoulder 31 ball 40 retainer 41 first split retainer 42 second split retainer 43 notch 45 pocket 50 connecting means

Claims (2)

内径面に軌道溝が形成された外輪と、外径面に軌道溝が形成された内輪と、外輪の軌道溝と内輪の軌道溝間に組込まれたボールおよびそのボールを保持する保持器とからなり、前記外輪における軌道溝の一側の肩および前記内輪における軌道溝の他側の肩の高さを、外輪の他側の肩および前記内輪の一側の肩の高さより高くし、外輪の高さの高い肩の肩高さをＨ１、ボールの球径をｄとしたとき、ボールの球径ｄに対する肩高さＨ１の比率Ｈ１／ｄを０．２５を超える大きさとし、前記保持器が、円筒形の第１分割保持器と、その第１分割保持器の内側に挿入される円筒形の第２分割保持器からなり、前記第１分割保持器と第２分割保持器の前記ボールと対向する側部に、その両分割保持器を内外に組み合わせた状態でボール保持用の円形のポケットを形成する切欠部を周方向に間隔をおいて設け、前記第１分割保持器と第２分割保持器が円形のポケットを形成する組み合わせ状態で、その両分割保持器を軸方向に非分離とする連結手段を設けた深みぞ玉軸受において、
前記第１分割保持器と第２分割保持器によって形成される円形ポケットのピッチ径中心がボールのピッチ径中心に一致する状態で、前記第１分割保持器の径方向厚さを前記第２分割保持器の径方向厚さより薄くし、前記内輪の高さの高い肩の肩高さＨ２のボールの球径ｄに対する比率Ｈ２／ｄを０．５０を超えて０．５２未満の範囲内とし、外輪と内輪の一側の肩間距離と他側の肩間距離の合計をボールの球径よりも大きくしたことを特徴とする深みぞ玉軸受。 From an outer ring having a raceway groove formed on the inner diameter surface, an inner ring having a raceway groove formed on the outer diameter surface, a ball assembled between the raceway groove of the outer ring and the raceway groove of the inner ring, and a cage for holding the ball The height of the shoulder on one side of the raceway groove in the outer ring and the shoulder on the other side of the raceway groove in the inner ring is made higher than the height of the shoulder on the other side of the outer ring and the shoulder on the one side of the inner ring, When the height of the shoulder of the high shoulder is H 1 and the ball diameter of the ball is d, the ratio H 1 / d of the shoulder height H 1 to the ball diameter d of the ball exceeds 0.25, The cage is composed of a cylindrical first divided cage and a cylindrical second divided cage inserted inside the first divided cage. The first divided cage and the second divided cage A ball holding circle in a state where both split cages are combined inside and outside on the side facing the ball. In the combined state in which the first split holder and the second split holder form a circular pocket, the two split holders are non-axially arranged in the axial direction. In deep groove ball bearings with connecting means for separation,
With the center of the pitch diameter of the circular pocket formed by the first split cage and the second split cage aligned with the pitch diameter center of the ball, the radial thickness of the first split cage is set to the second split cage. It is thinner than the cage thickness in the radial direction, and the ratio H 2 / d of the shoulder height H 2 of the shoulder having a high inner ring height to the ball diameter d of the ball is more than 0.50 and less than 0.52. A deep groove ball bearing characterized in that the sum of the distance between the shoulders on one side of the outer ring and the inner ring and the distance between the shoulders on the other side is made larger than the ball diameter. 前記第１分割保持器と前記第２分割保持器の厚さの比を９：１１とした請求項１に記載の深みぞ玉軸受。   The deep groove ball bearing according to claim 1, wherein a ratio of thicknesses of the first split cage and the second split cage is 9:11.
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