JP2008215471A - Tapered roller bearing - Google Patents

Tapered roller bearing Download PDF

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Publication number
JP2008215471A
JP2008215471A JP2007052866A JP2007052866A JP2008215471A JP 2008215471 A JP2008215471 A JP 2008215471A JP 2007052866 A JP2007052866 A JP 2007052866A JP 2007052866 A JP2007052866 A JP 2007052866A JP 2008215471 A JP2008215471 A JP 2008215471A
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Japan
Prior art keywords
tapered
tapered roller
raceway surface
inner ring
small
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Pending
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JP2007052866A
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Japanese (ja)
Inventor
Takumi Takeuchi
匠 竹内
Masahito Yoshida
雅人 吉田
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NSK Ltd
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NSK Ltd
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Priority to JP2007052866A priority Critical patent/JP2008215471A/en
Publication of JP2008215471A publication Critical patent/JP2008215471A/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
    • 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
    • F16C19/34—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 both radial and axial load
    • F16C19/36—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 both radial and axial load with a single row of rollers
    • F16C19/364—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 both radial and axial load with a single row of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tapered roller bearing capable of increasing a static rated load only by an internal design change, without changing an outside dimension, without a risk of reducing strength of a cage. <P>SOLUTION: This tapered roller bearing 10 has an inner ring 11 having a tapered raceway surface 16, having a small collar part 18 on the small diameter side of the raceway surface 16 and having a large collar part 17 on the large diameter side, an outer ring 21 having a tapered raceway surface 20, a plurality of tapered rollers 13 rollingly arranged between the raceway surface 16 of the inner ring and the raceway surface 20 of the outer ring 21, and the cage 14 retaining these tapered rollers 13 at an equal interval in the circumferential direction. The length L2 in the axial direction of the small collar part 18 of the inner ring 11, is set in a range of 3 to 10% of the length L1 of the tapered rollers 13. the small collar part 18 is coated with a metal before heat treatment. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、円すいころ軸受に関し、特に、自動車や産業機械、例えば、自動車のトランスミッションの回転部等に好適に用いられる円すいころ軸受に関する。   The present invention relates to a tapered roller bearing, and more particularly, to a tapered roller bearing that is suitably used for a rotating part of a transmission of an automobile or industrial machine, for example, an automobile.

円すいころ軸受は、円すい状の軌道面を有し該軌道面の小径側に小つば部を有すると共に大径側に大つば部を有する内輪と、円すい状の軌道面を有する外輪と、内輪の軌道面と外輪の軌道面との間に転動自在に配された複数の円すいころと、これら円すいころを円周方向に等間隔に保持する保持器とを具備している。従来の円すいころ軸受においては、内輪の小つば部の軸線方向の長さ（小つば部の厚さ）は、円すいころの長さの１０％を超える寸法に設定されている。   A tapered roller bearing has a conical raceway surface, an inner ring having a small brim portion on the small diameter side of the raceway surface and a large brim portion on the large diameter side, an outer ring having a conical raceway surface, and an inner ring A plurality of tapered rollers are provided between the raceway surface and the raceway surface of the outer ring so as to be freely rollable, and a cage for holding the tapered rollers at equal intervals in the circumferential direction. In conventional tapered roller bearings, the axial length of the small collar portion of the inner ring (thickness of the small collar portion) is set to a dimension that exceeds 10% of the length of the tapered roller.

また、円すいころ軸受の静定格荷重Ｃ０は、次の計算式（１）から算出されることが知られている（ＪＩＳ機械要素Ｂ１５１９参照）。 Further, static load rating C 0 of tapered roller bearings, (see JIS mechanical element B1519) of the following formula (1) to be calculated has been known.

Ｃ０＝（ｆ０）×Ｚ×Ｄｗｅ×Ｌｗｅ×ｃｏｓα …（１） C 0 = (f 0) × Z × D we × L we × cosα ... (1)

ここで、式（１）中の記号は以下の通りである。
ｆ０： 係数
Ｚ： 円すいころの本数
Ｄｗｅ： 円すいころの平均径＝（大径ｄ２＋小径ｄ１）／２
Ｌｗｅ： 円すいころの長さ
α： 外輪角 Here, the symbols in the formula (1) are as follows.
f 0 : coefficient Z: number of tapered rollers D we : average diameter of tapered rollers = (large diameter d2 + small diameter d1) / 2
L we : Tapered roller length α: Outer ring angle

静定格荷重Ｃ０を増加させる方法としては、上記式（１）から、円すいころの本数、円すいころの平均径、円すいころの長さのいずれかを増加させること、もしくは、ｃｏｓαを増大させることが、有効であることが分かる（例えば、特許文献１参照。）。特許文献１では、ころ充填率を上げる方法が提案されている。
特開２００５−１８８７３８号公報 As a method of increasing the static load rating C 0 , from the above formula (1), increasing the number of tapered rollers, the average diameter of the tapered rollers, or the length of the tapered rollers, or increasing cos α. Is effective (see, for example, Patent Document 1). In Patent Document 1, a method for increasing the roller filling rate is proposed.
JP 2005-188738 A

ところで、円すいころの本数の増加は、ころ充填率の増加のために保持器の柱幅を細くする必要があり、そのために、保持器の柱の強度低下が懸念される。また、円すいころの平均径の増加は、外輪の外径の拡大に繋がる懸念がある。また、内輪の小つば部の軸方向の長さ（つば厚さ）を保ったままでの円すいころの長さの増加は、軸受幅の増加になるため、組立幅の増加に繋がる懸念がある。そのため、自動車用トランスミッションの回転部に使用するような場合、設置スペースが限られているところへの組み付けとなるから、結果的に組み付け不可となる可能性が高い。   By the way, an increase in the number of tapered rollers requires a reduction in the column width of the cage in order to increase the roller filling rate. For this reason, there is a concern that the strength of the column of the cage is reduced. Moreover, there is concern that an increase in the average diameter of the tapered rollers may lead to an increase in the outer diameter of the outer ring. In addition, an increase in the length of the tapered roller while maintaining the axial length (collar thickness) of the small collar portion of the inner ring results in an increase in the bearing width, which may lead to an increase in the assembly width. Therefore, when it is used in a rotating part of an automobile transmission, it is assembled in a place where the installation space is limited.

本発明は、上記事情に鑑みて為されたものであり、その目的は、保持器の強度低下の懸念がなく、外形寸法を変更することもなく、内部的な設計変更のみにより、静定格荷重の増加を達成することのできる円すいころ軸受を提供することにある。   The present invention has been made in view of the above circumstances, and its purpose is not to reduce the strength of the cage, and without changing the external dimensions, only by changing the internal design, the static load rating. It is an object of the present invention to provide a tapered roller bearing capable of achieving an increase in the amount of rotation.

本発明の目的は、以下の構成によって達成される。
（１） 円すい状の軌道面を有し該軌道面の小径側に小つば部を有すると共に大径側に大つば部を有する内輪と、円すい状の軌道面を有する外輪と、前記内輪の軌道面と外輪の軌道面との間に転動自在に配された複数の円すいころと、前記円すいころを円周方向に等間隔に保持する保持器とを具備する円すいころ軸受において、
前記内輪の小つば部の軸線方向の長さが、前記円すいころの長さの３％以上１０％以下の範囲に設定されることを特徴とする円すいころ軸受。
（２） 前記小つば部にメッキ処理が施されていることを特徴とする（１）に記載の円すいころ軸受。 The object of the present invention is achieved by the following configurations.
(1) An inner ring having a conical raceway surface having a small brim portion on the small diameter side of the raceway surface and a large brim portion on the large diameter side, an outer ring having a conical raceway surface, and a raceway of the inner ring In a tapered roller bearing comprising a plurality of tapered rollers arranged to be freely rollable between a surface and a raceway surface of an outer ring, and a cage for holding the tapered rollers at equal intervals in the circumferential direction,
A tapered roller bearing characterized in that the axial length of the small collar portion of the inner ring is set in a range of 3% to 10% of the length of the tapered roller.
(2) The tapered roller bearing according to (1), wherein the small brim portion is plated.

本発明によれば、強度的に影響のほとんど出ない内輪の小つば部の寸法が、従来品よりも小さく、即ち、円すいころの長さの３％以上１０％以下の範囲に設定されるので、より長い円すいころを設置できるようになる。従って、長い円すいころの設置により、保持器が強度低下せずに、外形寸法を維持したまま、静定格荷重の増加を達成することができる。   According to the present invention, the size of the small brim portion of the inner ring that hardly affects the strength is set smaller than that of the conventional product, that is, within a range of 3% to 10% of the length of the tapered roller. , Longer tapered rollers can be installed. Accordingly, the installation of the long tapered roller can achieve an increase in the static load rating while maintaining the outer dimensions without reducing the strength of the cage.

以下、本発明の一実施形態に係る円すいころ軸受について、図面を参照して詳細に説明する。   Hereinafter, a tapered roller bearing according to an embodiment of the present invention will be described in detail with reference to the drawings.

本実施形態の円すいころ軸受１０は、円すい状の軌道面１６を有し該軌道面１６の大径側に大つば部１７を有すると共に小径側に小つば部１８を有する内輪１１と、円すい状の軌道面２０を有する外輪２１と、内輪１１の軌道面１６と外輪２１の軌道面２０との間に転動自在に配された複数の円すいころ１３と、これら円すいころ１３を円周方向に等間隔に保持する保持器１４と、を備える。また、本実施形態では、内輪１１の小つば部１８の軸線方向の長さＬ２は、円すいころ１３の長さＬ１の３％以上１０％以下の範囲に設定されている。   The tapered roller bearing 10 of the present embodiment includes a tapered raceway surface 16, an inner ring 11 having a large collar portion 17 on the large diameter side of the raceway surface 16 and a small collar portion 18 on the small diameter side, and a tapered shape. An outer ring 21 having a raceway surface 20, a plurality of tapered rollers 13 arranged so as to roll between the raceway surface 16 of the inner ring 11 and the raceway surface 20 of the outer ring 21, and these tapered rollers 13 in the circumferential direction. And a retainer 14 that is held at regular intervals. In the present embodiment, the axial length L2 of the small brim portion 18 of the inner ring 11 is set in a range of 3% to 10% of the length L1 of the tapered roller 13.

内輪１１の小つば部１８は、円すいころ１３の脱落防止のためのものであり、円すいころ１３を組み込んだ後には、通常の使用状態での外力Pのかかる方向は大つば部１７に向かう方向であるから、小つば部１８には殆ど荷重がかからない。そこで、小つば部１８の軸方向寸法Ｌ２を、円すいころ１３の長さを増加することで有効性を発揮できる分だけ小さく、即ち、円すいころ１３の長さの１０％以下とした。但し、製造時には、製品同士の衝突により、小つば部１８に割れやひびが生じる懸念があるため、ある程度の軸方向寸法は確保する必要があり、最低限、円すいころ１３の長さの３％以上とした。   The small collar portion 18 of the inner ring 11 is for preventing the tapered roller 13 from falling off. After the tapered roller 13 is assembled, the direction in which the external force P is applied in the normal use state is the direction toward the large collar portion 17. Therefore, little load is applied to the small brim portion 18. Therefore, the axial dimension L2 of the small collar portion 18 is set to be small enough to exhibit the effectiveness by increasing the length of the tapered roller 13, that is, 10% or less of the length of the tapered roller 13. However, at the time of manufacturing, there is a concern that cracks and cracks may occur in the small brim portion 18 due to collision between products, so it is necessary to ensure a certain axial dimension, and at least 3% of the length of the tapered roller 13 That is all.

また、図２に示すように、小つば部１８だけに、熱処理前に防炭のためのメッキ処理（メッキ処理部をハッチングで示す）が施されて強化してある。メッキ処理の例としては、第１に銅メッキがあげられるが、その他に硬化クロムメッキやロジウムメッキ等も硬化の点で有効である。   Further, as shown in FIG. 2, only the small brim portion 18 is strengthened by being subjected to a plating treatment for preventing charcoal (a plating treatment portion is indicated by hatching) before heat treatment. As an example of the plating treatment, first, copper plating can be cited, but other than that, cured chromium plating, rhodium plating, and the like are also effective in terms of curing.

このように構成される円すいころ軸受１０では、従来に比べて長い円すいころ１３を組み込むことができる。従って、（１）式のＬｗｅが増大することにより、静定格荷重Ｃ０が増大する。 In the tapered roller bearing 10 configured as described above, it is possible to incorporate a tapered roller 13 that is longer than the conventional one. Therefore, by increasing the expression (1) of L we, static load rating C 0 is increased.

図３（ａ）は、従来品の円すいころ１３ａの例を、（ｂ）は本実施形態の円すいころ１３の例を、（ｃ）は両円すいころを並べて示す。図３に示すように、両円すいころ１３，１３ａの小径部の径ｄ１と大径部の径ｄ２をそれぞれ等しく設定して、ころの長さ寸法をＬ３からＬ４（＞Ｌ３）に変更すると、図３（ａ）の円すいころ１３ａの円すい角（ころ角度）β１より、図３（ｂ）の円すいころ１３の円すい角（ころ角度）β２の方が小さくなり、それに従って外輪角αがα１からα２と小さくなり、結果的にｃｏｓαが増加して、（１）式により、静定格荷重Ｃ０が増大する。 3A shows an example of a conventional tapered roller 13a, FIG. 3B shows an example of the tapered roller 13 of this embodiment, and FIG. 3C shows both tapered rollers side by side. As shown in FIG. 3, when the diameter d1 of the small diameter portion and the diameter d2 of the large diameter portion of both tapered rollers 13 and 13a are set equal to each other, and the length of the roller is changed from L3 to L4 (> L3), The tapered angle (roller angle) β2 of the tapered roller 13 in FIG. 3B is smaller than the tapered angle (roller angle) β1 of the tapered roller 13a in FIG. 3A, and the outer ring angle α is accordingly increased from α1. As a result, the cos α increases, and the static load rating C 0 increases according to the equation (1).

従って、本実施形態の円すいころ軸受１０によれば、強度的に影響のほとんど出ない内輪の小つば部１８の寸法が、円すいころ１３の長さの３％以上１０％以下の範囲に設定されるので、より長い円すいころ１３を設置できるようになる。従って、長い円すいころ１３の設置により、保持器１４が強度低下せずに、外形寸法を維持したまま、静定格荷重Ｃ０の増加を達成することができ、耐負荷荷重が増大し、ころがり寿命が向上する。 Therefore, according to the tapered roller bearing 10 of the present embodiment, the dimension of the small collar portion 18 of the inner ring that hardly affects the strength is set in the range of 3% to 10% of the length of the tapered roller 13. Therefore, longer tapered rollers 13 can be installed. Therefore, the installation of the long tapered roller 13 can achieve an increase in the static load rating C 0 while maintaining the outer dimensions without reducing the strength of the cage 14, increasing the load bearing load, and rolling life. Will improve.

なお、本発明は、上述した実施形態に限定されるものでなく、適宜、変形、改良等が可能である。   In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

本発明の実施形態の円すいころ軸受の要部構成を示す図であり、（ａ）は外輪を省略した円すいころ軸受の断面図、（ｂ）は内輪の要部拡大断面図である。It is a figure which shows the principal part structure of the tapered roller bearing of embodiment of this invention, (a) is sectional drawing of the tapered roller bearing which abbreviate | omitted the outer ring | wheel, (b) is a principal part expanded sectional view of an inner ring | wheel. 同内輪のメッキ処理部分を示す側面図である。It is a side view which shows the plating process part of the inner ring | wheel. 円すいころの長さと円すい角の関係を示す図で、（ａ）は従来の円すいころを示し、（ｂ）は本発明の円すいころを示し、（ｃ）は両方の円すいころを比べて示す。It is a figure which shows the relationship between the length of a tapered roller and a cone angle, (a) shows the conventional tapered roller, (b) shows the tapered roller of this invention, (c) shows both tapered rollers in comparison.

符号の説明Explanation of symbols

１０ 円すいころ軸受
１１ 内輪
１３ 円すいころ
１４ 保持器
１６ 軌道面
１７ 大つば部
１８ 小つば部
２０ 軌道面
２１ 外輪
Ｌ１ 円すいころの長さ
Ｌ２ 小つば部の軸方向の長さ（小つば部の厚さ） DESCRIPTION OF SYMBOLS 10 Tapered roller bearing 11 Inner ring 13 Tapered roller 14 Cage 16 Raceway surface 17 Large collar part 18 Small collar part 20 Race surface 21 Outer ring L1 Length of tapered roller L2 Length of axial direction of small collar part (thickness of small collar part) Sa)

Claims (2)

円すい状の軌道面を有し該軌道面の小径側に小つば部を有すると共に大径側に大つば部を有する内輪と、円すい状の軌道面を有する外輪と、前記内輪の軌道面と外輪の軌道面との間に転動自在に配された複数の円すいころと、前記円すいころを円周方向に等間隔に保持する保持器とを具備する円すいころ軸受において、
前記内輪の小つば部の軸線方向の長さが、前記円すいころの長さの３％以上１０％以下の範囲に設定されることを特徴とする円すいころ軸受。 An inner ring having a conical raceway surface and having a small brim portion on the small diameter side of the raceway surface and a large brim portion on the large diameter side, an outer ring having a conical raceway surface, and the raceway surface and outer ring of the inner ring In the tapered roller bearing comprising a plurality of tapered rollers arranged to be freely rollable between the raceway surface and a cage for holding the tapered rollers at equal intervals in the circumferential direction,
A tapered roller bearing characterized in that the axial length of the small collar portion of the inner ring is set in a range of 3% to 10% of the length of the tapered roller. 前記小つば部にメッキ処理が施されていることを特徴とする請求項１に記載の円すいころ軸受。   The tapered roller bearing according to claim 1, wherein the small collar portion is plated.
JP2007052866A 2007-03-02 2007-03-02 Tapered roller bearing Pending JP2008215471A (en)

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JP2007052866A JP2008215471A (en) 2007-03-02 2007-03-02 Tapered roller bearing

Publications (1)

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JP2008215471A true JP2008215471A (en) 2008-09-18

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113167320A (en) * 2018-12-07 2021-07-23 Ntn株式会社 Tapered roller bearing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113167320A (en) * 2018-12-07 2021-07-23 Ntn株式会社 Tapered roller bearing
CN113167320B (en) * 2018-12-07 2022-11-11 Ntn株式会社 Tapered roller bearing

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