JP4269708B2 - Ball bearing - Google Patents

Ball bearing Download PDF

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Publication number
JP4269708B2
JP4269708B2 JP2003038605A JP2003038605A JP4269708B2 JP 4269708 B2 JP4269708 B2 JP 4269708B2 JP 2003038605 A JP2003038605 A JP 2003038605A JP 2003038605 A JP2003038605 A JP 2003038605A JP 4269708 B2 JP4269708 B2 JP 4269708B2
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Japan
Prior art keywords
outer ring
raceway
inner ring
cage
ring
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Expired - Fee Related
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JP2003038605A
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JP2004245391A (en
Inventor
祥一 前原
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JTEKT Corp
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JTEKT Corp
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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
    • F16C19/02—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
    • 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/38—Ball cages
    • F16C33/41—Ball cages comb-shaped
    • F16C33/412—Massive or moulded comb cages, e.g. snap ball cages
    • F16C33/414—Massive or moulded comb cages, e.g. snap ball cages formed as one-piece cages, i.e. monoblock comb cages
    • 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
    • F16C33/58—Raceways; Race rings
    • F16C33/588—Races of sheet metal
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/767—Sealings of ball or roller bearings integral with the race
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7893—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a cage or integral therewith
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/80—Labyrinth sealings

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

Description

【０００１】
【発明の属する技術分野】
本発明は、自動車のステアリングコラム、スタータなどに用いられる玉軸受に関する。
【０００２】
【従来の技術】
従来から、自動車のステアリングコラムやスタータなどには、軸受として、例えばアンギュラ玉軸受、深溝玉軸受といった玉軸受が用いられている。ところが、ステアリングコラムは、自動車の走行中、常に大きな荷重を受けるものではなく、またスタータは自動車のエンジン始動時のみに短時間（概ね１秒程度）高速回転するものであり、耐久性などの要求特性が高くないので、一般の玉軸受では過剰品質となる。そのため、軌道輪として、冷間圧延鋼板等をプレス加工したものを用い、高品質ではないが安価である玉軸受の開発が進められている。
【０００３】
例えば、安価でありながら所定の使用条件を実現するのに充分な性能を持つ、玉の軌道用の球面部とその両側に各々連設された大径円筒部及び小径円筒部とを有する外輪と、上記外輪の球面部に対向する玉の軌道用の球面部とその両側に各々連設された大径円筒部及び小径円筒部とを有する内輪と、内輪の小径円筒部の端部に折り曲げ形成され且つ外輪の小径円筒部の端部に近接するフランジ状の第１密閉部と、外輪の大径円筒部の内周面に圧入され且つ内輪の大径円筒部に近接する円環状の第２密封部とを具備するアンギュラ玉軸受が提案されている（特許文献１参照）。
【０００４】
【特許文献１】
特開平７−２４８０１８号公報（請求項１、第１図）
【０００５】
【発明が解決しようとする課題】
ところで、安価化を目的とした玉軸受では、品質をある程度犠牲にしているとはいえ、外部から異物が混入すると、軌道輪の軌道部における玉の転動状態が悪化して短寿命となるので、防塵性が高いことが求められる。ところが、上記したアンギュラ玉軸受のように、高い密封性を確保するためにシールやシールドなどの別個の部品を用いることは、部品点数の増加により安価効果が損なわれるので、安価化のニーズに充分に応えた玉軸受とはならない。
【０００６】
本発明はこのような事情に鑑みなされたものであり、部品点数の増加などにより安価効果が損なわれるといったことがなく、しかも高い防塵性を実現した玉軸受の提供をその目的とする。
【０００７】
【課題を解決するための手段】
本発明の玉軸受は、鋼板をプレス加工して得られる外輪および内輪と、前記外輪および内輪の間に転動自在に配置された複数の玉と、前記複数の玉を保持する冠形の保持器とを備えた玉軸受であって、前記外輪が、軸方向一方側で径方向内方に縮径するとともに所定曲率半径を有する軌道部と、その軌道部の軸方向他方側に連なり軸方向に延設される円筒部とを有し、前記内輪が、前記外輪の軌道部と対向し所定曲率半径を有する軌道部と、その軌道部の前記軸方向一方側に連なり軸方向に延設される円筒部とを有し、前記内輪の円筒部の外周縁に前記保持器と離隔するよう薄肉にした段差部を周設し、この段差部と前記保持器との間でラビリンスシールを構成し、前記保持器は、この保持器における前記軸方向一方側の外周面が前記外輪の軌道部の縮径部分の内周面と径方向に対向するとともに、この保持器における前記軸方向他方側の外周が前記外輪の軌道部の縮径部分より大径とされており、前記外輪に、この外輪の円筒部の前記軸方向他方側に連なるとともに前記内輪の軌道部に近接するよう径方向内方に延設された折曲部を設け、前記折曲部の前記径方向内方側の先端部によって形成される開口部の径を、前記冠形の保持器の最外径よりも大きくしており、前記折曲部と前記内輪の軌道部との間でラビリンスシールを構成したことを特徴としている（請求項１）。
上記の構成によれば、前記内輪の円筒部の外周縁に周設した段差部と、前記冠形の保持器との間でラビリンスシールを構成し、かつ前記折曲部と前記内輪の軌道部との間でラビリンスシールを構成しているので、内輪の円筒部と冠形の保持器との間の隙間から異物が混入するのが抑制され、高い防塵性を実現することができる。また、防塵性を高めるためのシールやシールドなどの別個の部品を用いないので、部品点数が増加せず、安価な玉軸受の提供が実現できる。
【０００８】
【発明の実施の形態】
つぎに、本発明の実施形態について図面を参照しながら説明する。
図１は本発明の玉軸受の一実施形態に係るアンギュラ玉軸受を模式的に示す断面図である。このアンギュラ玉軸受は、外輪１１と、内輪１２と、両者の間に転動自在に配置される複数の玉１３と、複数の玉１３を保持するための冠形の保持器１４とから構成される。
【０００９】
外輪１１は、所定曲率半径を有する軌道部１１ａと、その軌道部１１ａに連なり軸方向に延設される円筒部１１ｂとを有する。また、その円筒部１１ｂに連なり径方向内方に延設される折曲部１１ｃを有しており、この折曲部１１ｃは、折り曲げやすいように、軌道部１１ａや円筒部１１ｂよりも若干薄肉になっている。
このような外輪１１は、例えば、縁部を薄肉にした冷間圧延鋼板などの鋼板を深絞り加工した後、底を打ち抜き、さらに上記の薄肉の縁部を折り曲げて折曲部１１ｃを形成した後、浸炭焼入れ、高周波焼入れなどを含む熱処理を行うことにより製造することができる。また、外輪１１は、熱処理後にバレル加工による仕上げ処理が施される。
【００１０】
内輪１２は、前記外輪１１の軌道部１１ａと対向し所定曲率半径を有する軌道部１２ａと、その軌道部１２ａに連なり前記外輪１１の折曲部１１ｃの内周端に近接するよう延設される径方向延設部１２ｂとを有する。また、前記軌道部１２ａに連なり軸方向に延設される円筒部１２ｄを有している。そして、この円筒部１２ｄの外周縁には、保持器１４の内径面１４ａと対向し所定距離で離隔するよう薄肉にした平坦な段差部２２が周設され、この段差部２２は厚肉の円筒部１２ｄと傾斜面２２ａで連なっている。なお、保持器１４の内径面１４ａと段差部２２との距離は、ラビリンス効果を奏するよう、回転数などに応じて適宜設定される。
このような内輪１２は、例えば、冷間圧延鋼板などの鋼板を深絞り加工した後、底を打ち抜き、さらに平坦な段差部２２を形成した後、浸炭焼入れ、高周波焼入れなどを含む熱処理を行うことにより製造することができる。また、内輪１２は、熱処理後にバレル加工による仕上げ処理が施される。
【００１１】
本形態に係るアンギュラ玉軸受は、保持器１４の内径面１４ａと離隔するよう薄肉にした平坦な段差部２２が周設されているので、この段差部２２と保持器１４との間に狭い隙間が形成され、ラビリンスシールを構成する。そのため、内輪２２の回転に伴いラビリンス効果が得られ、その結果として外部からの異物の混入が抑制される。さらに、内輪１２の径方向延設部１２ｂと外輪１１の折曲部１１ｃとが近接しているので、同様にラビリンス効果により、反対側の外部からの異物の混入も抑制できるという利点がある。また、外輪１１および内輪１２を深絞り加工で製造するとともに、シールやシールドを用いず部品点数を増加させていないので、安価な製品となる。さらに、外輪１１の折曲部１１ｃが径方向内方に延設され、しかもその折曲部１１ｃの内周端に近接するよう内輪１２の径方向延設部１２ｂが形成されているので、コンパクトな玉軸受となり、そのためこの玉軸受を用いる各種機器の省スペース化に寄与できるという利点がある。
【００１２】
なお、上記の実施形態において、段差部２２と厚肉の円筒部１２ｄとが傾斜面２２ａで連なっている態様を説明したが、本発明はこれに限定するものではなく、例えば、段差部２２と厚肉の円筒部１２ｄとが垂直面で連なっていてもよい。また、段差部２２は、必ずしも平坦である必要はなく、傾斜していてもよい。
また、外輪１１と内輪１２とを非分離にして取り扱い性を高めるべく、外輪１１の折曲部１１ｃや内輪１２の径方向延設部１２ｂに、これらに延設される突起部などの係合部を形成してもよい。詳細には、例えば内輪１２の径方向延設部１２ｂに連なり、かつ前記外輪の折曲部の内周端よりも外輪１１の円筒部１１ｂに近接するよう延設される突起部を形成したり、内輪１２の径方向延設部１２ｂを二等配で径方向外方に変形させてなり、かつ前記外輪１１の折曲部１１ｃの内周端よりも外輪１１の円筒部１１ｂに近接するよう延設される膨出部を形成したりしてもよい。このように係合部としての突起部や膨出部を形成した場合、その突起部や膨出部を通過させるための切り欠き部を外輪１１の折曲部１１ｃに形成するようにしてもよい。
【００１３】
本発明の玉軸受は、例えば、自動車のステアリングコラム、スタータといった、耐久面などに関し高度な性能が要求されない部位の軸受として好適に用いられる。
【００１４】
【発明の効果】
以上のように、本発明の玉軸受によれば、内輪の円筒部の外周縁に冠形の保持器と離隔するよう薄肉にした段差部を周設し、この段差部と前記冠形の保持器との間でラビリンスシールを構成し、かつ前記折曲部と前記内輪の軌道部との間でラビリンスシールを構成しているので、外部からの異物の混入が抑制され、高い防塵性を実現することができる。また、防塵性を高めるためのシールやシールドなどの別個の部品を用いないので、安価な玉軸受の提供が実現できる。
【図面の簡単な説明】
【図１】本発明の玉軸受の一実施形態に係るアンギュラ玉軸受を模式的に示す断面図である。
【符号の説明】
１１ 外輪
１１ａ 外輪の軌道部
１１ｂ 外輪の円筒部
１１ｃ 外輪の折曲部
１２ 内輪
１２ａ 内輪の軌道部
１２ｂ 内輪の径方向延設部
１２ｄ 内輪の円筒部
１３ 玉
１４ 保持器
１４ａ 保持器の内径面
２２ 段差部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ball bearing used for a steering column, a starter or the like of an automobile.
[0002]
[Prior art]
Conventionally, ball bearings such as angular ball bearings and deep groove ball bearings have been used as bearings in automobile steering columns, starters, and the like. However, the steering column does not always receive a large load while the vehicle is running, and the starter rotates at high speed for a short time (approximately 1 second) only when the engine of the vehicle is started. Since the characteristics are not high, general ball bearings have excessive quality. For this reason, ball bearings that are not high-quality but inexpensive are being developed by using cold-rolled steel sheets or the like as race rings.
[0003]
For example, an outer ring having a spherical portion for a ball raceway and a large-diameter cylindrical portion and a small-diameter cylindrical portion that are continuously provided on both sides of the spherical portion, which is inexpensive but has sufficient performance to realize predetermined use conditions. The inner ring having a spherical part for the raceway of the ball facing the spherical part of the outer ring and a large-diameter cylindrical part and a small-diameter cylindrical part connected to both sides of the spherical part, and bent at the end of the small-diameter cylindrical part of the inner ring A flange-shaped first sealing portion that is close to the end of the small-diameter cylindrical portion of the outer ring, and an annular second portion that is press-fitted into the inner peripheral surface of the large-diameter cylindrical portion of the outer ring and close to the large-diameter cylindrical portion of the inner ring. An angular ball bearing having a sealing portion has been proposed (see Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 7-248018 (Claim 1, FIG. 1)
[0005]
[Problems to be solved by the invention]
By the way, in ball bearings for the purpose of cost reduction, quality is sacrificed to some extent, but if foreign matter enters from the outside, the rolling state of the balls in the raceway part of the raceway deteriorates and the life is shortened. High dust resistance is required. However, the use of separate parts such as seals and shields to ensure high sealing performance as in the case of the angular ball bearing described above is not sufficient for the need for cost reduction because the increase in the number of parts impairs the cost effectiveness. It is not a ball bearing that meets the requirements.
[0006]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a ball bearing that does not impair the low cost effect due to an increase in the number of parts and that realizes high dust resistance.
[0007]
[Means for Solving the Problems]
The ball bearing according to the present invention includes an outer ring and an inner ring obtained by pressing a steel plate, a plurality of balls arranged to roll between the outer ring and the inner ring, and a crown-shaped holding for holding the plurality of balls. The outer ring is reduced in diameter radially inward on one side in the axial direction and has a predetermined radius of curvature, and is connected to the other side in the axial direction of the raceway in the axial direction. The inner ring is connected to the raceway portion facing the outer race track portion and having a predetermined radius of curvature, and extends in the axial direction in a row on one side of the raceway portion in the axial direction. A step portion that is thinned so as to be separated from the cage, and a labyrinth seal is configured between the step portion and the cage. In the cage, the outer peripheral surface of the cage on one side in the axial direction is the outer ring. The outer peripheral surface of the cage is radially opposed to the inner peripheral surface of the reduced diameter portion of the road portion, and the outer diameter of the cage on the other side in the axial direction is larger than the reduced diameter portion of the raceway portion of the outer ring. A bent portion that extends inward in the radial direction so as to be close to the raceway portion of the inner ring and that is connected to the other axial side of the cylindrical portion of the outer ring, and is provided on the radially inner side of the bent portion. The diameter of the opening formed by the tip of the crown is larger than the outermost diameter of the crown-shaped cage, and a labyrinth seal is configured between the bent portion and the raceway portion of the inner ring . (Claim 1).
According to said structure, a labyrinth seal is comprised between the level | step-difference part provided in the outer periphery of the cylindrical part of the said inner ring | wheel, and the said crown-shaped holder | retainer , and the said bending part and the track part of the said inner ring | wheel Since a labyrinth seal is formed between the outer ring and the inner ring, foreign matter is prevented from entering through a gap between the cylindrical portion of the inner ring and the crown-shaped cage, and high dust resistance can be realized. In addition, since separate parts such as a seal and a shield for improving dust resistance are not used, the number of parts does not increase, and an inexpensive ball bearing can be provided.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view schematically showing an angular ball bearing according to an embodiment of the ball bearing of the present invention. This angular ball bearing includes an outer ring 11, an inner ring 12, a plurality of balls 13 that are rotatably disposed between the two, and a crown-shaped cage 14 that holds the plurality of balls 13. The
[0009]
The outer ring 11 includes a track portion 11a having a predetermined radius of curvature, and a cylindrical portion 11b that extends in the axial direction and continues to the track portion 11a. Moreover, it has the bending part 11c which continues to the cylindrical part 11b, and is extended in the radial direction, and this bending part 11c is a little thinner than the track part 11a or the cylindrical part 11b so that it may be easy to bend. It has become.
For example, such an outer ring 11 is formed by deep drawing a steel sheet such as a cold rolled steel sheet having a thin edge, and then punching the bottom, and bending the thin edge to form a bent part 11c. Then, it can manufacture by performing heat processing including carburizing quenching, induction hardening, and the like. Further, the outer ring 11 is subjected to a finishing process by barrel processing after the heat treatment.
[0010]
The inner ring 12 is opposed to the track portion 11a of the outer ring 11 and has a track portion 12a having a predetermined radius of curvature, and extends so as to be close to the inner peripheral end of the bent portion 11c of the outer ring 11 connected to the track portion 12a. And a radially extending portion 12b. Moreover, it has the cylindrical part 12d extended in the axial direction continuing to the said track part 12a. A flat stepped portion 22 is formed around the outer peripheral edge of the cylindrical portion 12d so as to face the inner diameter surface 14a of the retainer 14 and be separated by a predetermined distance. The stepped portion 22 is a thick cylinder. The portion 12d and the inclined surface 22a are connected. In addition, the distance between the inner diameter surface 14a of the cage 14 and the stepped portion 22 is appropriately set according to the number of rotations or the like so as to achieve a labyrinth effect.
Such an inner ring 12 is subjected to heat treatment including carburizing quenching, induction quenching, etc., after deep drawing a steel plate such as a cold rolled steel plate, punching the bottom, and forming a flat stepped portion 22. Can be manufactured. The inner ring 12 is subjected to a finishing process by barrel processing after the heat treatment.
[0011]
The angular ball bearing according to this embodiment has a flat step portion 22 that is thin so as to be separated from the inner diameter surface 14 a of the cage 14, and therefore a narrow gap is formed between the step portion 22 and the cage 14. Forming a labyrinth seal. Therefore, a labyrinth effect is obtained with the rotation of the inner ring 22, and as a result, mixing of foreign matters from the outside is suppressed. Furthermore, since the radially extending portion 12b of the inner ring 12 and the bent portion 11c of the outer ring 11 are close to each other, there is an advantage that foreign matter from the outside on the opposite side can also be suppressed due to the labyrinth effect. Further, since the outer ring 11 and the inner ring 12 are manufactured by deep drawing and the number of parts is not increased without using seals or shields, the product is inexpensive. Further, since the bent portion 11c of the outer ring 11 extends radially inward, and the radially extended portion 12b of the inner ring 12 is formed so as to be close to the inner peripheral end of the bent portion 11c, it is compact. Therefore, there is an advantage that it can contribute to space saving of various devices using the ball bearing.
[0012]
In the above embodiment, the aspect in which the stepped portion 22 and the thick cylindrical portion 12d are connected by the inclined surface 22a has been described. However, the present invention is not limited to this, and for example, the stepped portion 22 and The thick cylindrical portion 12d may be continuous on a vertical plane. Further, the step portion 22 is not necessarily flat and may be inclined.
Further, in order to improve the handling by making the outer ring 11 and the inner ring 12 non-separated, the bent portion 11c of the outer ring 11 and the radially extending portion 12b of the inner ring 12 are engaged with protrusions or the like extending to these. A part may be formed. Specifically, for example, a protrusion that extends to the radially extending portion 12b of the inner ring 12 and extends closer to the cylindrical portion 11b of the outer ring 11 than the inner peripheral end of the bent portion of the outer ring is formed. The radially extending portion 12b of the inner ring 12 is deformed radially outwardly in two equal parts, and is closer to the cylindrical portion 11b of the outer ring 11 than the inner peripheral end of the bent portion 11c of the outer ring 11. An extended bulging portion may be formed. Thus, when the protrusion part and the bulging part as an engaging part are formed, you may make it form the notch part for allowing the protrusion part and the bulging part to pass in the bending part 11c of the outer ring | wheel 11. .
[0013]
The ball bearing of the present invention is suitably used as a bearing where a high level of performance is not required for a durable surface such as a steering column or starter of an automobile.
[0014]
【The invention's effect】
As described above, according to the ball bearing of the present invention, and circumferentially provided a step portion that is thinner so that spaced apart from the crown-shaped retainer to the outer peripheral edge of the inner ring of the cylindrical portion, holding this stepped portion of the crown-shaped A labyrinth seal is formed with the vessel, and a labyrinth seal is formed between the bent portion and the raceway portion of the inner ring. can do. In addition, since separate parts such as a seal and a shield for improving dust resistance are not used, it is possible to provide an inexpensive ball bearing.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view schematically showing an angular ball bearing according to an embodiment of a ball bearing of the present invention.
[Explanation of symbols]
11 Outer ring 11a Outer ring raceway part 11b Outer ring cylindrical part 11c Outer ring bent part 12 Inner ring 12a Inner ring raceway part 12b Inner ring radial extending part 12d Inner ring cylindrical part 13 Ball 14 Cage 14a Cage inner diameter surface 22 Step

Claims (1)

鋼板をプレス加工して得られる外輪および内輪と、前記外輪および内輪の間に転動自在に配置された複数の玉と、前記複数の玉を保持する冠形の保持器とを備えた玉軸受であって、
前記外輪が、軸方向一方側で径方向内方に縮径するとともに所定曲率半径を有する軌道部と、その軌道部の軸方向他方側に連なり軸方向に延設される円筒部とを有し、
前記内輪が、前記外輪の軌道部と対向し所定曲率半径を有する軌道部と、その軌道部の前記軸方向一方側に連なり軸方向に延設される円筒部とを有し、
前記内輪の円筒部の外周縁に前記保持器と離隔するよう薄肉にした段差部を周設し、この段差部と前記保持器との間でラビリンスシールを構成し、
前記保持器は、この保持器における前記軸方向一方側の外周面が前記外輪の軌道部の縮径部分の内周面と径方向に対向するとともに、この保持器における前記軸方向他方側の外周が前記外輪の軌道部の縮径部分より大径とされており、
前記外輪に、この外輪の円筒部の前記軸方向他方側に連なるとともに前記内輪の軌道部に近接するよう径方向内方に延設された折曲部を設け、
前記折曲部の前記径方向内方側の先端部によって形成される開口部の径を、前記冠形の保持器の最外径よりも大きくしており、
前記折曲部と前記内輪の軌道部との間でラビリンスシールを構成したことを特徴とする玉軸受。A ball bearing provided with an outer ring and an inner ring obtained by pressing a steel plate, a plurality of balls arranged to roll between the outer ring and the inner ring, and a crown-shaped cage for holding the plurality of balls Because
The outer ring has a raceway portion having a predetermined radius of curvature while being radially reduced inward in the axial direction on one side , and a cylindrical portion that extends in the axial direction and continues to the other side in the axial direction of the raceway portion. ,
The inner ring has a raceway part facing the raceway part of the outer ring and having a predetermined radius of curvature, and a cylindrical part extending in the axial direction and connected to one side of the raceway part in the axial direction ;
And circumferentially it provided a step portion that is thinner to separated from the retainer to the outer peripheral edge of the inner ring of the cylindrical portion, to constitute a labyrinth seal between the step portion and said retainer,
The cage has an outer circumferential surface on one axial side of the cage that is radially opposed to an inner circumferential surface of a reduced diameter portion of the raceway portion of the outer ring, and an outer circumferential surface on the other axial side of the cage. Is larger than the reduced diameter portion of the outer ring raceway,
The outer ring is provided with a bent portion extending inward in the radial direction so as to be connected to the other axial side of the cylindrical portion of the outer ring and close to the raceway portion of the inner ring,
The diameter of the opening formed by the radially inner tip of the bent portion is larger than the outermost diameter of the crown-shaped cage;
A ball bearing comprising a labyrinth seal formed between the bent portion and the raceway portion of the inner ring .
JP2003038605A 2003-02-17 2003-02-17 Ball bearing Expired - Fee Related JP4269708B2 (en)

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CN106870555A (en) * 2017-04-24 2017-06-20 江苏人乐汽车轴承制造有限公司临清分公司 A kind of novel steering waterproof sealing bearing and preparation method and application
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